Add emoji reaction

app/chewy/statuses_index.rb

@@ -57,6 +57,11 @@ class StatusesIndex < Chewy::Index
       data.each.with_object({}) { |(id, name), result| (result[id] ||= []).push(name) }
     end
 
+    crutch :emoji_reactions do |collection|
+      data = ::EmojiReaction.where(status_id: collection.map(&:id)).where(account: Account.local).pluck(:status_id, :account_id)
+      data.each.with_object({}) { |(id, name), result| (result[id] ||= []).push(name) }
+    end
+
     root date_detection: false do
       field :id, type: 'long'
       field :account_id, type: 'long'

app/controllers/api/v1/emoji_reactions_controller.rb

@@ -0,0 +1,89 @@
+# frozen_string_literal: true
+
+class Api::V1::EmojiReactionsController < Api::BaseController
+  before_action -> { doorkeeper_authorize! :read, :'read:favourites' }
+  before_action :require_user!
+  after_action :insert_pagination_headers
+
+  def index
+    @statuses  = load_statuses
+    accountIds = @statuses.filter(&:quote?).map { |status| status.quote.account_id }.uniq
+    render json: @statuses, each_serializer: REST::StatusSerializer, relationships: StatusRelationshipsPresenter.new(@statuses, current_user&.account_id), account_relationships: AccountRelationshipsPresenter.new(accountIds, current_user&.account_id)
+  end
+
+  private
+
+  def load_statuses
+    cached_emoji_reactions
+  end
+
+  def cached_emoji_reactions
+    cache_collection(Status.where(id: results.pluck(:status_id)), Status)
+  end
+
+  def results
+    @_results ||= filtered_emoji_reactions.joins('INNER JOIN statuses ON statuses.deleted_at IS NULL AND statuses.id = emoji_reactions.status_id').to_a_paginated_by_id(
+      limit_param(DEFAULT_STATUSES_LIMIT),
+      params_slice(:max_id, :since_id, :min_id)
+    )
+  end
+
+  def filtered_emoji_reactions
+    account_emoji_reactions.tap do |emoji_reactions|
+      emoji_reactions.merge!(emojis_scope) if emojis_requested?
+    end
+  end
+
+  def account_emoji_reactions
+    current_account.emoji_reactions
+  end
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def next_path
+    api_v1_emoji_reactions_url pagination_params(max_id: pagination_max_id) if records_continue?
+  end
+
+  def prev_path
+    api_v1_emoji_reactions_url pagination_params(min_id: pagination_since_id) unless results.empty?
+  end
+
+  def pagination_max_id
+    results.last.id
+  end
+
+  def pagination_since_id
+    results.first.id
+  end
+
+  def records_continue?
+    results.size == limit_param(DEFAULT_STATUSES_LIMIT)
+  end
+
+  def emojis_requested?
+    emoji_reactions_params[:emojis].present?
+  end
+
+  def emojis_scope
+    emoji_reactions = EmojiReaction.none
+
+    emoji_reactions_params[:emojis].each do |emoji|
+      shortcode, domain = emoji.split("@")
+      custom_emoji = CustomEmoji.find_by(shortcode: shortcode, domain: domain)
+
+      emoji_reactions = emoji_reactions.or(EmojiReaction.where(name: shortcode, custom_emoji: custom_emoji))
+    end
+
+    emoji_reactions
+  end
+
+  def pagination_params(core_params)
+    params.slice(:limit).permit(:limit).merge(core_params)
+  end
+
+  def emoji_reactions_params
+    params.permit(emojis: [])
+  end
+end

app/controllers/api/v1/push/subscriptions_controller.rb

@@ -52,6 +52,6 @@ class Api::V1::Push::SubscriptionsController < Api::BaseController
   def data_params
     return {} if params[:data].blank?
 
-    params.require(:data).permit(:policy, alerts: [:follow, :follow_request, :favourite, :reblog, :mention, :poll, :status])
+    params.require(:data).permit(:policy, alerts: [:follow, :follow_request, :favourite, :reblog, :mention, :poll, :status, :emoji_reaction])
   end
 end

app/controllers/api/v1/statuses/emoji_reactioned_by_accounts_controller.rb

@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+class Api::V1::Statuses::EmojiReactionedByAccountsController < Api::BaseController
+  include Authorization
+
+  before_action -> { authorize_if_got_token! :read, :'read:accounts' }
+  before_action :set_status
+  after_action :insert_pagination_headers
+
+  def index
+    @accounts = load_accounts
+    render json: @accounts, each_serializer: REST::AccountSerializer
+  end
+
+  private
+
+  def load_accounts
+    scope = default_accounts
+    scope = scope.where.not(id: current_account.excluded_from_timeline_account_ids) unless current_account.nil?
+    scope.merge(paginated_emoji_reactions).to_a
+  end
+
+  def default_accounts
+    Account
+      .without_suspended
+      .includes(:emoji_reactions, :account_stat)
+      .references(:emoji_reactions)
+      .where(emoji_reactions: { status_id: @status.id })
+  end
+
+  def paginated_emoji_reactions
+    EmojiReaction.paginate_by_max_id(
+      limit_param(DEFAULT_ACCOUNTS_LIMIT),
+      params[:max_id],
+      params[:since_id]
+    )
+  end
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def next_path
+    if records_continue?
+      api_v1_status_emoji_reactioned_by_index_url pagination_params(max_id: pagination_max_id)
+    end
+  end
+
+  def prev_path
+    unless @accounts.empty?
+      api_v1_status_emoji_reactioned_by_index_url pagination_params(since_id: pagination_since_id)
+    end
+  end
+
+  def pagination_max_id
+    @accounts.last.emoji_reactions.last.id
+  end
+
+  def pagination_since_id
+    @accounts.first.emoji_reactions.first.id
+  end
+
+  def records_continue?
+    @accounts.size == limit_param(DEFAULT_ACCOUNTS_LIMIT)
+  end
+
+  def set_status
+    @status = Status.include_expired(current_account).find(params[:status_id])
+    authorize @status, :show?
+  rescue Mastodon::NotPermittedError
+    not_found
+  end
+
+  def pagination_params(core_params)
+    params.slice(:limit).permit(:limit).merge(core_params)
+  end
+end

app/controllers/api/v1/statuses/emoji_reactions_controller.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class Api::V1::Statuses::EmojiReactionsController < Api::BaseController
+  include Authorization
+
+  before_action -> { doorkeeper_authorize! :write, :'write:favourites' }
+  before_action :require_user!
+  before_action :set_status
+
+  def update
+    EmojiReactionService.new.call(current_account, @status, params[:id])
+    render json: @status, serializer: REST::StatusSerializer
+  end
+
+  def destroy
+    #UnEmojiReactionWorker.perform_async(current_account.id, @status.id)
+    UnEmojiReactionService.new.call(current_account, @status)
+
+    render json: @status, serializer: REST::StatusSerializer, relationships: StatusRelationshipsPresenter.new([@status], current_account.id, emoji_reactions_map: { @status.id => false })
+  end
+
+  private
+
+  def set_status
+    @status = Status.find(params[:status_id])
+    authorize @status, :show?
+  rescue Mastodon::NotPermittedError
+    not_found
+  end
+end

app/controllers/api/web/push_subscriptions_controller.rb

@@ -26,6 +26,7 @@ class Api::Web::PushSubscriptionsController < Api::Web::BaseController
         mention: alerts_enabled,
         poll: alerts_enabled,
         status: alerts_enabled,
+        emoji_reaction: alerts_enabled,
       },
     }
 
@@ -61,6 +62,6 @@ class Api::Web::PushSubscriptionsController < Api::Web::BaseController
   end
 
   def data_params
-    @data_params ||= params.require(:data).permit(:policy, alerts: [:follow, :follow_request, :favourite, :reblog, :mention, :poll, :status])
+    @data_params ||= params.require(:data).permit(:policy, alerts: [:follow, :follow_request, :favourite, :reblog, :mention, :poll, :status, :emoji_reaction])
   end
 end

app/controllers/settings/preferences_controller.rb

@@ -67,7 +67,8 @@ class Settings::PreferencesController < Settings::BaseController
       :setting_show_tab_bar_label,
       :setting_show_target,
       :setting_enable_limited_timeline,
-      notification_emails: %i(follow follow_request reblog favourite mention digest report pending_account trending_tag),
+      :setting_enable_reaction,
+      notification_emails: %i(follow follow_request reblog favourite emoji_reaction mention digest report pending_account trending_tag),
       interactions: %i(must_be_follower must_be_following must_be_following_dm)
     )
   end

app/javascript/mastodon/actions/emoji_reactions.js

@@ -0,0 +1,94 @@
+import { fetchRelationships } from './accounts';
+import api, { getLinks } from '../api';
+import { importFetchedStatuses } from './importer';
+import { uniq } from '../utils/uniq';
+
+export const EMOJI_REACTIONED_STATUSES_FETCH_REQUEST = 'EMOJI_REACTIONED_STATUSES_FETCH_REQUEST';
+export const EMOJI_REACTIONED_STATUSES_FETCH_SUCCESS = 'EMOJI_REACTIONED_STATUSES_FETCH_SUCCESS';
+export const EMOJI_REACTIONED_STATUSES_FETCH_FAIL    = 'EMOJI_REACTIONED_STATUSES_FETCH_FAIL';
+
+export const EMOJI_REACTIONED_STATUSES_EXPAND_REQUEST = 'EMOJI_REACTIONED_STATUSES_EXPAND_REQUEST';
+export const EMOJI_REACTIONED_STATUSES_EXPAND_SUCCESS = 'EMOJI_REACTIONED_STATUSES_EXPAND_SUCCESS';
+export const EMOJI_REACTIONED_STATUSES_EXPAND_FAIL    = 'EMOJI_REACTIONED_STATUSES_EXPAND_FAIL';
+
+export function fetchEmojiReactionedStatuses() {
+  return (dispatch, getState) => {
+    if (getState().getIn(['status_lists', 'emoji_reactions', 'isLoading'])) {
+      return;
+    }
+
+    dispatch(fetchEmojiReactionedStatusesRequest());
+
+    api(getState).get('/api/v1/emoji_reactions').then(response => {
+      const next = getLinks(response).refs.find(link => link.rel === 'next');
+      dispatch(importFetchedStatuses(response.data));
+      dispatch(fetchRelationships(uniq(response.data.map(item => item.reblog ? item.reblog.account.id : item.account.id))));
+      dispatch(fetchEmojiReactionedStatusesSuccess(response.data, next ? next.uri : null));
+    }).catch(error => {
+      dispatch(fetchEmojiReactionedStatusesFail(error));
+    });
+  };
+};
+
+export function fetchEmojiReactionedStatusesRequest() {
+  return {
+    type: EMOJI_REACTIONED_STATUSES_FETCH_REQUEST,
+  };
+};
+
+export function fetchEmojiReactionedStatusesSuccess(statuses, next) {
+  return {
+    type: EMOJI_REACTIONED_STATUSES_FETCH_SUCCESS,
+    statuses,
+    next,
+  };
+};
+
+export function fetchEmojiReactionedStatusesFail(error) {
+  return {
+    type: EMOJI_REACTIONED_STATUSES_FETCH_FAIL,
+    error,
+  };
+};
+
+export function expandEmojiReactionedStatuses() {
+  return (dispatch, getState) => {
+    const url = getState().getIn(['status_lists', 'emoji_reactions', 'next'], null);
+
+    if (url === null || getState().getIn(['status_lists', 'emoji_reactions', 'isLoading'])) {
+      return;
+    }
+
+    dispatch(expandEmojiReactionedStatusesRequest());
+
+    api(getState).get(url).then(response => {
+      const next = getLinks(response).refs.find(link => link.rel === 'next');
+      dispatch(importFetchedStatuses(response.data));
+      dispatch(fetchRelationships(uniq(response.data.map(item => item.reblog ? item.reblog.account.id : item.account.id))));
+      dispatch(expandEmojiReactionedStatusesSuccess(response.data, next ? next.uri : null));
+    }).catch(error => {
+      dispatch(expandEmojiReactionedStatusesFail(error));
+    });
+  };
+};
+
+export function expandEmojiReactionedStatusesRequest() {
+  return {
+    type: EMOJI_REACTIONED_STATUSES_EXPAND_REQUEST,
+  };
+};
+
+export function expandEmojiReactionedStatusesSuccess(statuses, next) {
+  return {
+    type: EMOJI_REACTIONED_STATUSES_EXPAND_SUCCESS,
+    statuses,
+    next,
+  };
+};
+
+export function expandEmojiReactionedStatusesFail(error) {
+  return {
+    type: EMOJI_REACTIONED_STATUSES_EXPAND_FAIL,
+    error,
+  };
+};

app/javascript/mastodon/actions/interactions.js

@@ -25,6 +25,10 @@ export const FAVOURITES_FETCH_REQUEST = 'FAVOURITES_FETCH_REQUEST';
 export const FAVOURITES_FETCH_SUCCESS = 'FAVOURITES_FETCH_SUCCESS';
 export const FAVOURITES_FETCH_FAIL    = 'FAVOURITES_FETCH_FAIL';
 
+export const EMOJI_REACTIONS_FETCH_REQUEST = 'EMOJI_REACTIONS_FETCH_REQUEST';
+export const EMOJI_REACTIONS_FETCH_SUCCESS = 'EMOJI_REACTIONS_FETCH_SUCCESS';
+export const EMOJI_REACTIONS_FETCH_FAIL    = 'EMOJI_REACTIONS_FETCH_FAIL';
+
 export const MENTIONS_FETCH_REQUEST = 'MENTIONS_FETCH_REQUEST';
 export const MENTIONS_FETCH_SUCCESS = 'MENTIONS_FETCH_SUCCESS';
 export const MENTIONS_FETCH_FAIL    = 'MENTIONS_FETCH_FAIL';
@@ -45,6 +49,16 @@ export const UNBOOKMARK_REQUEST = 'UNBOOKMARKED_REQUEST';
 export const UNBOOKMARK_SUCCESS = 'UNBOOKMARKED_SUCCESS';
 export const UNBOOKMARK_FAIL    = 'UNBOOKMARKED_FAIL';
 
+export const EMOJI_REACTION_REQUEST = 'EMOJI_REACTION_REQUEST';
+export const EMOJI_REACTION_SUCCESS = 'EMOJI_REACTION_SUCCESS';
+export const EMOJI_REACTION_FAIL    = 'EMOJI_REACTION_FAIL';
+
+export const UN_EMOJI_REACTION_REQUEST = 'UN_EMOJI_REACTION_REQUEST';
+export const UN_EMOJI_REACTION_SUCCESS = 'UN_EMOJI_REACTION_SUCCESS';
+export const UN_EMOJI_REACTION_FAIL    = 'UN_EMOJI_REACTION_FAIL';
+
+export const EMOJI_REACTION_UPDATE = 'EMOJI_REACTION_UPDATE';
+
 export function reblog(status, visibility) {
   return function (dispatch, getState) {
     dispatch(reblogRequest(status));
@@ -341,6 +355,41 @@ export function fetchFavouritesFail(id, error) {
   };
 };
 
+export function fetchEmojiReactions(id) {
+  return (dispatch, getState) => {
+    dispatch(fetchEmojiReactionsRequest(id));
+
+    api(getState).get(`/api/v1/statuses/${id}/emoji_reactioned_by`).then(response => {
+      dispatch(importFetchedAccounts(response.data));
+      dispatch(fetchEmojiReactionsSuccess(id, response.data));
+    }).catch(error => {
+      dispatch(fetchEmojiReactionsFail(id, error));
+    });
+  };
+};
+
+export function fetchEmojiReactionsRequest(id) {
+  return {
+    type: EMOJI_REACTIONS_FETCH_REQUEST,
+    id,
+  };
+};
+
+export function fetchEmojiReactionsSuccess(id, accounts) {
+  return {
+    type: EMOJI_REACTIONS_FETCH_SUCCESS,
+    id,
+    accounts,
+  };
+};
+
+export function fetchEmojiReactionsFail(id, error) {
+  return {
+    type: EMOJI_REACTIONS_FETCH_FAIL,
+    error,
+  };
+};
+
 export function fetchMentions(id) {
   return (dispatch, getState) => {
     dispatch(fetchMentionsRequest(id));
@@ -451,3 +500,118 @@ export function unpinFail(status, error) {
     skipLoading: true,
   };
 };
+
+export function addEmojiReaction(status, name, domain, url, static_url) {
+  return function (dispatch, getState) {
+    dispatch(emojiReactionRequest(status, name, domain, url, static_url));
+
+    api(getState).put(`/api/v1/statuses/${status.get('id')}/emoji_reactions/${name}${domain ? `@${domain}` : ''}`).then(function (response) {
+      dispatch(importFetchedStatus(response.data));
+      dispatch(emojiReactionSuccess(status, name, domain, url, static_url));
+    }).catch(function (error) {
+      dispatch(emojiReactionFail(status, name, domain, url, static_url, error));
+    });
+  };
+};
+
+export function emojiReactionRequest(status, name, domain, url, static_url) {
+  return {
+    type: EMOJI_REACTION_REQUEST,
+    status: status,
+    name: name,
+    domain: domain,
+    url: url,
+    static_url: static_url,
+    skipLoading: true,
+  };
+};
+
+export function emojiReactionSuccess(status, name, domain, url, static_url) {
+  return {
+    type: EMOJI_REACTION_SUCCESS,
+    status: status,
+    name: name,
+    domain: domain,
+    url: url,
+    static_url: static_url,
+    skipLoading: true,
+  };
+};
+
+export function emojiReactionFail(status, name, domain, url, static_url, error) {
+  return {
+    type: EMOJI_REACTION_FAIL,
+    status: status,
+    name: name,
+    domain: domain,
+    url: url,
+    static_url: static_url,
+    error: error,
+    skipLoading: true,
+  };
+};
+
+const findMyEmojiReaction = (status) => {
+  return status.get('emoji_reactions').find(emoji_reaction => emoji_reaction.get('me') === true) ?? {};
+};
+
+export function removeEmojiReaction(status) {
+  return function (dispatch, getState) {
+    const {name, domain, url, static_url} = findMyEmojiReaction(status).toObject();
+
+    if (name) {
+      dispatch(unEmojiReactionRequest(status, name, domain, url, static_url));
+
+      api(getState).post(`/api/v1/statuses/${status.get('id')}/emoji_unreaction`).then(function (response) {
+        dispatch(importFetchedStatus(response.data));
+        dispatch(unEmojiReactionSuccess(status, name, domain, url, static_url));
+      }).catch(function (error) {
+        dispatch(unEmojiReactionFail(status, name, domain, url, static_url, error));
+      });
+    }
+  };
+};
+
+export function unEmojiReactionRequest(status, name, domain, url, static_url) {
+  return {
+    type: UN_EMOJI_REACTION_REQUEST,
+    status: status,
+    name: name,
+    domain: domain,
+    url: url,
+    static_url: static_url,
+    skipLoading: true,
+  };
+};
+
+export function unEmojiReactionSuccess(status, name, domain, url, static_url) {
+  return {
+    type: UN_EMOJI_REACTION_SUCCESS,
+    status: status,
+    name: name,
+    domain: domain,
+    url: url,
+    static_url: static_url,
+    skipLoading: true,
+  };
+};
+
+export function unEmojiReactionFail(status, name, domain, url, static_url, error) {
+  return {
+    type: UN_EMOJI_REACTION_FAIL,
+    status: status,
+    name: name,
+    domain: domain,
+    url: url,
+    static_url: static_url,
+    error: error,
+    skipLoading: true,
+  };
+};
+
+export const updateEmojiReaction = emoji_reaction => {
+  return {
+    type: EMOJI_REACTION_UPDATE,
+    emojiReaction: emoji_reaction,
+  };
+};

app/javascript/mastodon/actions/notifications.js

@@ -13,7 +13,7 @@ import { defineMessages } from 'react-intl';
 import { List as ImmutableList } from 'immutable';
 import { unescapeHTML } from '../utils/html';
 import { getFiltersRegex } from '../selectors';
-import { usePendingItems as preferPendingItems } from 'mastodon/initial_state';
+import { usePendingItems as preferPendingItems, enableReaction } from 'mastodon/initial_state';
 import compareId from 'mastodon/compare_id';
 import { searchTextFromRawStatus } from 'mastodon/actions/importer/normalizer';
 import { requestNotificationPermission } from '../utils/notifications';
@@ -120,7 +120,9 @@ export function updateNotifications(notification, intlMessages, intlLocale) {
 const excludeTypesFromSettings = state => state.getIn(['settings', 'notifications', 'shows']).filter(enabled => !enabled).keySeq().toJS();
 
 const excludeTypesFromFilter = filter => {
-  const allTypes = ImmutableList(['follow', 'follow_request', 'favourite', 'reblog', 'mention', 'poll']);
+  const allTypes = enableReaction ?
+    ImmutableList(['follow', 'follow_request', 'favourite', 'reblog', 'mention', 'poll', 'emoji_reaction']) :
+    ImmutableList(['follow', 'follow_request', 'favourite', 'reblog', 'mention', 'poll']);
   return allTypes.filterNot(item => item === filter).toJS();
 };
 

app/javascript/mastodon/actions/streaming.js

@@ -11,6 +11,7 @@ import {
 import { getHomeVisibilities } from 'mastodon/selectors';
 import { updateNotifications, expandNotifications } from './notifications';
 import { updateConversations } from './conversations';
+import { updateEmojiReaction } from './interactions';
 import {
   fetchAnnouncements,
   updateAnnouncements,
@@ -88,6 +89,9 @@ export const connectTimelineStream = (timelineId, channelName, params = {}, opti
         case 'filters_changed':
           dispatch(fetchFilters());
           break;
+        case 'emoji_reaction':
+          dispatch(updateEmojiReaction(JSON.parse(data.payload)));
+          break;
         case 'announcement':
           dispatch(updateAnnouncements(JSON.parse(data.payload)));
           break;

app/javascript/mastodon/components/emoji.js

@@ -0,0 +1,65 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { autoPlayGif } from 'mastodon/initial_state';
+import { assetHost } from 'mastodon/utils/config';
+import unicodeMapping from 'mastodon/features/emoji/emoji_unicode_mapping_light';
+
+export default class Emoji extends React.PureComponent {
+
+  static propTypes = {
+    emoji: PropTypes.string.isRequired,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+    hovered: PropTypes.bool.isRequired,
+    url: PropTypes.string,
+    static_url: PropTypes.string,
+  };
+
+  render () {
+    const { emoji, emojiMap, hovered, url, static_url } = this.props;
+
+    if (unicodeMapping[emoji]) {
+      const { filename, shortCode } = unicodeMapping[emoji];
+      const title = shortCode ? `:${shortCode}:` : '';
+
+      return (
+        <img
+          draggable='false'
+          className='emojione'
+          alt={emoji}
+          title={title}
+          src={`${assetHost}/emoji/${filename}.svg`}
+        />
+      );
+    } else if (emojiMap.get(emoji)) {
+      const filename  = (autoPlayGif || hovered) ? emojiMap.getIn([emoji, 'url']) : emojiMap.getIn([emoji, 'static_url']);
+      const shortCode = `:${emoji}:`;
+
+      return (
+        <img
+          draggable='false'
+          className='emojione custom-emoji'
+          alt={shortCode}
+          title={shortCode}
+          src={filename}
+        />
+      );
+    } else if (url || static_url) {
+      const filename  = (autoPlayGif || hovered) && url ? url : static_url;
+      const shortCode = `:${emoji}:`;
+
+      return (
+        <img
+          draggable='false'
+          className='emojione custom-emoji'
+          alt={shortCode}
+          title={shortCode}
+          src={filename}
+        />
+      );
+    } else {
+      return null;
+    }
+  }
+
+}

app/javascript/mastodon/components/emoji_reactions_bar.js

@@ -0,0 +1,111 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import classNames from 'classnames';
+import Emoji from './emoji';
+import unicodeMapping from 'mastodon/features/emoji/emoji_unicode_mapping_light';
+import TransitionMotion from 'react-motion/lib/TransitionMotion';
+import AnimatedNumber from 'mastodon/components/animated_number';
+import { reduceMotion } from 'mastodon/initial_state';
+import spring from 'react-motion/lib/spring';
+
+class EmojiReaction extends ImmutablePureComponent {
+
+  static propTypes = {
+    status: ImmutablePropTypes.map.isRequired,
+    emojiReaction: ImmutablePropTypes.map.isRequired,
+    addEmojiReaction: PropTypes.func.isRequired,
+    removeEmojiReaction: PropTypes.func.isRequired,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+    style: PropTypes.object,
+  };
+
+  state = {
+    hovered: false,
+  };
+
+  handleClick = () => {
+    const { emojiReaction, status, addEmojiReaction, removeEmojiReaction } = this.props;
+
+    if (emojiReaction.get('me')) {
+      removeEmojiReaction(status);
+    } else {
+      addEmojiReaction(status, emojiReaction.get('name'), emojiReaction.get('domain', null), emojiReaction.get('url', null), emojiReaction.get('static_url', null));
+    }
+  }
+
+  handleMouseEnter = () => this.setState({ hovered: true })
+
+  handleMouseLeave = () => this.setState({ hovered: false })
+
+  render () {
+    const { emojiReaction, status } = this.props;
+
+    let shortCode = emojiReaction.get('name');
+
+    if (unicodeMapping[shortCode]) {
+      shortCode = unicodeMapping[shortCode].shortCode;
+    }
+
+    return (
+      <button className={classNames('reactions-bar__item', { active: emojiReaction.get('me') })} disabled={status.get('emoji_reactioned') && !emojiReaction.get('me')} onClick={this.handleClick} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave} title={`:${shortCode}:`} style={this.props.style}>
+        <span className='reactions-bar__item__emoji'><Emoji hovered={this.state.hovered} emoji={emojiReaction.get('name')} emojiMap={this.props.emojiMap} url={emojiReaction.get('url')} static_url={emojiReaction.get('static_url')} /></span>
+        <span className='reactions-bar__item__count'><AnimatedNumber value={emojiReaction.get('count')} /></span>
+      </button>
+    );
+  }
+  
+}
+
+export default class EmojiReactionsBar extends ImmutablePureComponent {
+
+  static propTypes = {
+    status: ImmutablePropTypes.map.isRequired,
+    addEmojiReaction: PropTypes.func.isRequired,
+    removeEmojiReaction: PropTypes.func.isRequired,
+    emojiMap: ImmutablePropTypes.map.isRequired,
+  };
+
+  willEnter () {
+    return { scale: reduceMotion ? 1 : 0 };
+  }
+
+  willLeave () {
+    return { scale: reduceMotion ? 0 : spring(0, { stiffness: 170, damping: 26 }) };
+  }
+
+  render () {
+    const { status } = this.props;
+    const emoji_reactions = status.get("emoji_reactions")
+    const visibleReactions = emoji_reactions.filter(x => x.get('count') > 0);
+
+    const styles = visibleReactions.map(emoji_reaction => ({
+      key: `${emoji_reaction.get('name')}@${emoji_reaction.get('domain', '')}`,
+      data: emoji_reaction,
+      style: { scale: reduceMotion ? 1 : spring(1, { stiffness: 150, damping: 13 }) },
+    })).toArray();
+
+    return (
+      <TransitionMotion styles={styles} willEnter={this.willEnter} willLeave={this.willLeave}>
+        {items => (
+          <div className={classNames('reactions-bar', { 'reactions-bar--empty': visibleReactions.isEmpty() })}>
+            {items.map(({ key, data, style }) => (
+              <EmojiReaction
+                key={key}
+                emojiReaction={data}
+                style={{ transform: `scale(${style.scale})`, position: style.scale < 0.5 ? 'absolute' : 'static' }}
+                status={this.props.status}
+                addEmojiReaction={this.props.addEmojiReaction}
+                removeEmojiReaction={this.props.removeEmojiReaction}
+                emojiMap={this.props.emojiMap}
+              />
+            ))}
+            {visibleReactions.size < 8}
+          </div>
+        )}
+      </TransitionMotion>
+    );
+  }
+
+}

app/javascript/mastodon/components/reaction_picker_dropdown.js

@@ -0,0 +1,395 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { defineMessages, injectIntl } from 'react-intl';
+import { EmojiPicker as EmojiPickerAsync } from '../features/ui/util/async-components';
+import Overlay from 'react-overlays/lib/Overlay';
+import classNames from 'classnames';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { supportsPassiveEvents } from 'detect-passive-events';
+import { buildCustomEmojis, categoriesFromEmojis } from '../features/emoji/emoji';
+import { assetHost } from 'mastodon/utils/config';
+import IconButton from './icon_button';
+
+const messages = defineMessages({
+  emoji: { id: 'emoji_button.label', defaultMessage: 'Insert emoji' },
+  emoji_search: { id: 'emoji_button.search', defaultMessage: 'Search...' },
+  emoji_not_found: { id: 'emoji_button.not_found', defaultMessage: 'No emojos!! (╯°□°）╯︵ ┻━┻' },
+  custom: { id: 'emoji_button.custom', defaultMessage: 'Custom' },
+  recent: { id: 'emoji_button.recent', defaultMessage: 'Frequently used' },
+  search_results: { id: 'emoji_button.search_results', defaultMessage: 'Search results' },
+  people: { id: 'emoji_button.people', defaultMessage: 'People' },
+  nature: { id: 'emoji_button.nature', defaultMessage: 'Nature' },
+  food: { id: 'emoji_button.food', defaultMessage: 'Food & Drink' },
+  activity: { id: 'emoji_button.activity', defaultMessage: 'Activity' },
+  travel: { id: 'emoji_button.travel', defaultMessage: 'Travel & Places' },
+  objects: { id: 'emoji_button.objects', defaultMessage: 'Objects' },
+  symbols: { id: 'emoji_button.symbols', defaultMessage: 'Symbols' },
+  flags: { id: 'emoji_button.flags', defaultMessage: 'Flags' },
+});
+
+let EmojiPicker, Emoji; // load asynchronously
+
+const backgroundImageFn = () => `${assetHost}/emoji/sheet_10.png`;
+const listenerOptions = supportsPassiveEvents ? { passive: true } : false;
+
+class ModifierPickerMenu extends React.PureComponent {
+
+  static propTypes = {
+    active: PropTypes.bool,
+    onSelect: PropTypes.func.isRequired,
+    onClose: PropTypes.func.isRequired,
+  };
+
+  handleClick = e => {
+    this.props.onSelect(e.currentTarget.getAttribute('data-index') * 1);
+  }
+
+  componentWillReceiveProps (nextProps) {
+    if (nextProps.active) {
+      this.attachListeners();
+    } else {
+      this.removeListeners();
+    }
+  }
+
+  componentWillUnmount () {
+    this.removeListeners();
+  }
+
+  handleDocumentClick = e => {
+    if (this.node && !this.node.contains(e.target)) {
+      this.props.onClose();
+    }
+  }
+
+  attachListeners () {
+    document.addEventListener('click', this.handleDocumentClick, false);
+    document.addEventListener('touchend', this.handleDocumentClick, listenerOptions);
+  }
+
+  removeListeners () {
+    document.removeEventListener('click', this.handleDocumentClick, false);
+    document.removeEventListener('touchend', this.handleDocumentClick, listenerOptions);
+  }
+
+  setRef = c => {
+    this.node = c;
+  }
+
+  render () {
+    const { active } = this.props;
+
+    return (
+      <div className='emoji-picker-dropdown__modifiers__menu' style={{ display: active ? 'block' : 'none' }} ref={this.setRef}>
+        <button onClick={this.handleClick} data-index={1}><Emoji emoji='fist' set='twitter' size={22} sheetSize={32} skin={1} backgroundImageFn={backgroundImageFn} /></button>
+        <button onClick={this.handleClick} data-index={2}><Emoji emoji='fist' set='twitter' size={22} sheetSize={32} skin={2} backgroundImageFn={backgroundImageFn} /></button>
+        <button onClick={this.handleClick} data-index={3}><Emoji emoji='fist' set='twitter' size={22} sheetSize={32} skin={3} backgroundImageFn={backgroundImageFn} /></button>
+        <button onClick={this.handleClick} data-index={4}><Emoji emoji='fist' set='twitter' size={22} sheetSize={32} skin={4} backgroundImageFn={backgroundImageFn} /></button>
+        <button onClick={this.handleClick} data-index={5}><Emoji emoji='fist' set='twitter' size={22} sheetSize={32} skin={5} backgroundImageFn={backgroundImageFn} /></button>
+        <button onClick={this.handleClick} data-index={6}><Emoji emoji='fist' set='twitter' size={22} sheetSize={32} skin={6} backgroundImageFn={backgroundImageFn} /></button>
+      </div>
+    );
+  }
+
+}
+
+class ModifierPicker extends React.PureComponent {
+
+  static propTypes = {
+    active: PropTypes.bool,
+    modifier: PropTypes.number,
+    onChange: PropTypes.func,
+    onClose: PropTypes.func,
+    onOpen: PropTypes.func,
+  };
+
+  handleClick = () => {
+    if (this.props.active) {
+      this.props.onClose();
+    } else {
+      this.props.onOpen();
+    }
+  }
+
+  handleSelect = modifier => {
+    this.props.onChange(modifier);
+    this.props.onClose();
+  }
+
+  render () {
+    const { active, modifier } = this.props;
+
+    return (
+      <div className='emoji-picker-dropdown__modifiers'>
+        <Emoji emoji='fist' set='twitter' size={22} sheetSize={32} skin={modifier} onClick={this.handleClick} backgroundImageFn={backgroundImageFn} />
+        <ModifierPickerMenu active={active} onSelect={this.handleSelect} onClose={this.props.onClose} />
+      </div>
+    );
+  }
+
+}
+
+@injectIntl
+class EmojiPickerMenu extends React.PureComponent {
+
+  static propTypes = {
+    custom_emojis: ImmutablePropTypes.list,
+    frequentlyUsedEmojis: PropTypes.arrayOf(PropTypes.string),
+    loading: PropTypes.bool,
+    onClose: PropTypes.func.isRequired,
+    onPick: PropTypes.func.isRequired,
+    style: PropTypes.object,
+    placement: PropTypes.string,
+    arrowOffsetLeft: PropTypes.string,
+    arrowOffsetTop: PropTypes.string,
+    intl: PropTypes.object.isRequired,
+    skinTone: PropTypes.number.isRequired,
+    onSkinTone: PropTypes.func.isRequired,
+  };
+
+  static defaultProps = {
+    style: {},
+    loading: true,
+    frequentlyUsedEmojis: [],
+  };
+
+  state = {
+    modifierOpen: false,
+    placement: null,
+  };
+
+  handleDocumentClick = e => {
+    if (this.node && !this.node.contains(e.target)) {
+      this.props.onClose();
+    }
+  }
+
+  componentDidMount () {
+    document.addEventListener('click', this.handleDocumentClick, false);
+    document.addEventListener('touchend', this.handleDocumentClick, listenerOptions);
+  }
+
+  componentWillUnmount () {
+    document.removeEventListener('click', this.handleDocumentClick, false);
+    document.removeEventListener('touchend', this.handleDocumentClick, listenerOptions);
+  }
+
+  setRef = c => {
+    this.node = c;
+  }
+
+  getI18n = () => {
+    const { intl } = this.props;
+
+    return {
+      search: intl.formatMessage(messages.emoji_search),
+      notfound: intl.formatMessage(messages.emoji_not_found),
+      categories: {
+        search: intl.formatMessage(messages.search_results),
+        recent: intl.formatMessage(messages.recent),
+        people: intl.formatMessage(messages.people),
+        nature: intl.formatMessage(messages.nature),
+        foods: intl.formatMessage(messages.food),
+        activity: intl.formatMessage(messages.activity),
+        places: intl.formatMessage(messages.travel),
+        objects: intl.formatMessage(messages.objects),
+        symbols: intl.formatMessage(messages.symbols),
+        flags: intl.formatMessage(messages.flags),
+        custom: intl.formatMessage(messages.custom),
+      },
+    };
+  }
+
+  handleClick = (emoji, event) => {
+    if (!emoji.native) {
+      emoji.native = emoji.colons;
+    }
+    if (!(event.ctrlKey || event.metaKey)) {
+      this.props.onClose();
+    }
+    this.props.onPick(emoji);
+  }
+
+  handleModifierOpen = () => {
+    this.setState({ modifierOpen: true });
+  }
+
+  handleModifierClose = () => {
+    this.setState({ modifierOpen: false });
+  }
+
+  handleModifierChange = modifier => {
+    this.props.onSkinTone(modifier);
+  }
+
+  render () {
+    const { loading, style, intl, custom_emojis, skinTone, frequentlyUsedEmojis } = this.props;
+
+    if (loading) {
+      return <div style={{ width: 299 }} />;
+    }
+
+    const title = intl.formatMessage(messages.emoji);
+
+    const { modifierOpen } = this.state;
+
+    const categoriesSort = [
+      'recent',
+      'people',
+      'nature',
+      'foods',
+      'activity',
+      'places',
+      'objects',
+      'symbols',
+      'flags',
+    ];
+
+    categoriesSort.splice(1, 0, ...Array.from(categoriesFromEmojis(custom_emojis)).sort());
+
+    return (
+      <div className={classNames('emoji-picker-dropdown__menu', { selecting: modifierOpen })} style={style} ref={this.setRef}>
+        <EmojiPicker
+          perLine={6}
+          emojiSize={32}
+          sheetSize={32}
+          custom={buildCustomEmojis(custom_emojis)}
+          color=''
+          emoji=''
+          set='twitter'
+          title={title}
+          i18n={this.getI18n()}
+          onClick={this.handleClick}
+          include={categoriesSort}
+          skin={skinTone}
+          showPreview={false}
+          backgroundImageFn={backgroundImageFn}
+          autoFocus={false}
+          emojiTooltip
+        />
+
+        <ModifierPicker
+          active={modifierOpen}
+          modifier={skinTone}
+          onOpen={this.handleModifierOpen}
+          onClose={this.handleModifierClose}
+          onChange={this.handleModifierChange}
+        />
+      </div>
+    );
+  }
+
+}
+
+export default @injectIntl
+class ReactionPickerDropdown extends React.PureComponent {
+
+  static propTypes = {
+    custom_emojis: ImmutablePropTypes.list,
+    frequentlyUsedEmojis: PropTypes.arrayOf(PropTypes.string),
+    intl: PropTypes.object.isRequired,
+    onPickEmoji: PropTypes.func.isRequired,
+    onRemoveEmoji: PropTypes.func.isRequired,
+    onSkinTone: PropTypes.func.isRequired,
+    skinTone: PropTypes.number.isRequired,
+    button: PropTypes.node,
+    dropdownPlacement: PropTypes.string,
+    iconButtonClass: PropTypes.string,
+    disabled: PropTypes.bool,
+    active: PropTypes.bool,
+    pressed: PropTypes.bool,
+  };
+
+  static defaultProps = {
+    iconButtonClass: 'status__action-bar-button',
+    disabled: false,
+    active: false,
+    pressed: false,
+  };
+
+  state = {
+    active: false,
+    loading: false,
+  };
+
+  setRef = (c) => {
+    this.dropdown = c;
+  }
+
+  onShowDropdown = ({ target }) => {
+    if (!this.props.disabled) {
+      this.setState({ active: true });
+
+      if (!EmojiPicker) {
+        this.setState({ loading: true });
+
+        EmojiPickerAsync().then(EmojiMart => {
+          EmojiPicker = EmojiMart.Picker;
+          Emoji       = EmojiMart.Emoji;
+
+          this.setState({ loading: false });
+        }).catch(() => {
+          this.setState({ loading: false, active: false });
+        });
+      }
+
+      const { top } = target.getBoundingClientRect();
+    }
+  }
+
+  onHideDropdown = () => {
+    if (!this.props.disabled) {
+      this.setState({ active: false });
+    }
+  }
+
+  onToggle = (e) => {
+    if (!this.state.loading && (!e.key || e.key === 'Enter') && !this.props.disabled) {
+      if (this.props.active) {
+        this.props.onRemoveEmoji();
+      } else if (this.state.active) {
+        this.onHideDropdown();
+      } else {
+        this.onShowDropdown(e);
+      }
+    }
+  }
+
+  handleKeyDown = e => {
+    if (e.key === 'Escape' && !this.props.disabled) {
+      this.onHideDropdown();
+    }
+  }
+
+  setTargetRef = c => {
+    this.target = c;
+  }
+
+  findTarget = () => {
+    return this.target;
+  }
+
+  render () {
+    const { intl, onPickEmoji, onSkinTone, skinTone, frequentlyUsedEmojis, iconButtonClass, dropdownPlacement, disabled, active, pressed } = this.props;
+    const title = intl.formatMessage(messages.emoji);
+    const { active: show, loading } = this.state;
+
+    return (
+      <div className='emoji-picker-dropdown' onKeyDown={this.handleKeyDown}>
+        <IconButton disabled={disabled} active={active} pressed={pressed} className={iconButtonClass} ref={this.setTargetRef} title={title} icon='smile-o' onClick={this.onToggle} />
+        <Overlay show={show} placement={dropdownPlacement} target={this.findTarget}>
+          <EmojiPickerMenu
+            custom_emojis={this.props.custom_emojis}
+            loading={loading}
+            onClose={this.onHideDropdown}
+            onPick={onPickEmoji}
+            onSkinTone={onSkinTone}
+            skinTone={skinTone}
+            frequentlyUsedEmojis={frequentlyUsedEmojis}
+          />
+        </Overlay>
+      </div>
+    );
+  }
+
+}

app/javascript/mastodon/components/status.js

@@ -17,10 +17,10 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import { MediaGallery, Video, Audio } from '../features/ui/util/async-components';
 import { HotKeys } from 'react-hotkeys';
 import classNames from 'classnames';
-import { Link } from 'react-router-dom';
 import Icon from 'mastodon/components/icon';
-import { displayMedia, me } from '../initial_state';
+import EmojiReactionsBar from 'mastodon/components/emoji_reactions_bar';
 import PictureInPicturePlaceholder from 'mastodon/components/picture_in_picture_placeholder';
+import { displayMedia, enableReaction } from 'mastodon/initial_state';
 
 // We use the component (and not the container) since we do not want
 // to use the progress bar to show download progress
@@ -144,6 +144,9 @@ class Status extends ImmutablePureComponent {
       available: PropTypes.bool,
     }),
     contextType: PropTypes.string,
+    emojiMap: ImmutablePropTypes.map,
+    addEmojiReaction: PropTypes.func.isRequired,
+    removeEmojiReaction: PropTypes.func.isRequired,
   };
 
   // Avoid checking props that are functions (and whose equality will always
@@ -709,6 +712,12 @@ class Status extends ImmutablePureComponent {
             {quote}
             {media}
 
+            {enableReaction && <EmojiReactionsBar
+              status={status}
+              addEmojiReaction={this.props.addEmojiReaction}
+              removeEmojiReaction={this.props.removeEmojiReaction}
+              emojiMap={this.props.emojiMap}
+            />}
             <StatusActionBar scrollKey={scrollKey} status={status} account={account} expired={expired} {...other} />
           </div>
         </div>

app/javascript/mastodon/components/status_action_bar.js

@@ -6,9 +6,11 @@ import IconButton from './icon_button';
 import DropdownMenuContainer from '../containers/dropdown_menu_container';
 import { defineMessages, injectIntl } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
-import { me, isStaff, show_bookmark_button, show_quote_button } from '../initial_state';
+import { me, isStaff, show_bookmark_button, show_quote_button, enableReaction } from '../initial_state';
 import classNames from 'classnames';
 
+import ReactionPickerDropdown from '../containers/reaction_picker_dropdown_container';
+
 const messages = defineMessages({
   delete: { id: 'status.delete', defaultMessage: 'Delete' },
   redraft: { id: 'status.redraft', defaultMessage: 'Delete & re-draft' },
@@ -85,6 +87,8 @@ class StatusActionBar extends ImmutablePureComponent {
     withDismiss: PropTypes.bool,
     scrollKey: PropTypes.string,
     intl: PropTypes.object.isRequired,
+    addEmojiReaction: PropTypes.func,
+    removeEmojiReaction: PropTypes.func,
   };
 
   static defaultProps = {
@@ -246,6 +250,16 @@ class StatusActionBar extends ImmutablePureComponent {
     }
   }
 
+  handleEmojiPick = data => {
+    const { addEmojiReaction, status } = this.props;
+    addEmojiReaction(status, data.native.replace(/:/g, ''), null, null, null);
+  }
+
+  handleEmojiRemove = () => {
+    const { removeEmojiReaction, status } = this.props;
+    removeEmojiReaction(status);
+  }
+
   render () {
     const { status, relationship, intl, withDismiss, scrollKey, expired } = this.props;
 
@@ -364,6 +378,7 @@ class StatusActionBar extends ImmutablePureComponent {
         <IconButton className={classNames('status__action-bar-button', { reblogPrivate })} disabled={!publicStatus && !reblogPrivate || expired}  active={status.get('reblogged')} pressed={status.get('reblogged')} title={reblogTitle} icon='retweet' onClick={this.handleReblogClick} />
         <IconButton className='status__action-bar-button star-icon' animate disabled={!me && expired} active={status.get('favourited')} pressed={status.get('favourited')} title={intl.formatMessage(messages.favourite)} icon='star' onClick={this.handleFavouriteClick} />
         {show_quote_button && <IconButton className='status__action-bar-button' disabled={anonymousAccess || !publicStatus || expired} title={!publicStatus ? intl.formatMessage(messages.cannot_quote) : intl.formatMessage(messages.quote)} icon='quote-right' onClick={this.handleQuoteClick} />}
+        {enableReaction && <ReactionPickerDropdown disabled={expired} active={status.get('emoji_reactioned')} pressed={status.get('emoji_reactioned')} className='status__action-bar-button' onPickEmoji={this.handleEmojiPick} onRemoveEmoji={this.handleEmojiRemove} />}
         {shareButton}
         {show_bookmark_button && <IconButton className='status__action-bar-button bookmark-icon' disabled={!me && expired} active={status.get('bookmarked')} pressed={status.get('bookmarked')} title={intl.formatMessage(status.get('bookmarked') ? messages.removeBookmark : messages.bookmark)} icon='bookmark' onClick={this.handleBookmarkClick} />}
 

app/javascript/mastodon/containers/reaction_picker_dropdown_container.js

@@ -0,0 +1,84 @@
+import { connect } from 'react-redux';
+import ReactionPickerDropdown from '../components/reaction_picker_dropdown';
+import { changeSetting } from '../actions/settings';
+import { createSelector } from 'reselect';
+import { Map as ImmutableMap } from 'immutable';
+import { useEmoji } from '../actions/emojis';
+
+const perLine = 8;
+const lines   = 2;
+
+const DEFAULTS = [
+  '+1',
+  'grinning',
+  'kissing_heart',
+  'heart_eyes',
+  'laughing',
+  'stuck_out_tongue_winking_eye',
+  'sweat_smile',
+  'joy',
+  'yum',
+  'disappointed',
+  'thinking_face',
+  'weary',
+  'sob',
+  'sunglasses',
+  'heart',
+  'ok_hand',
+];
+
+const getFrequentlyUsedEmojis = createSelector([
+  state => state.getIn(['settings', 'frequentlyUsedEmojis'], ImmutableMap()),
+], emojiCounters => {
+  let emojis = emojiCounters
+    .keySeq()
+    .sort((a, b) => emojiCounters.get(a) - emojiCounters.get(b))
+    .reverse()
+    .slice(0, perLine * lines)
+    .toArray();
+
+  if (emojis.length < DEFAULTS.length) {
+    let uniqueDefaults = DEFAULTS.filter(emoji => !emojis.includes(emoji));
+    emojis = emojis.concat(uniqueDefaults.slice(0, DEFAULTS.length - emojis.length));
+  }
+
+  return emojis;
+});
+
+const getCustomEmojis = createSelector([
+  state => state.get('custom_emojis'),
+], emojis => emojis.filter(e => e.get('visible_in_picker')).sort((a, b) => {
+  const aShort = a.get('shortcode').toLowerCase();
+  const bShort = b.get('shortcode').toLowerCase();
+
+  if (aShort < bShort) {
+    return -1;
+  } else if (aShort > bShort ) {
+    return 1;
+  } else {
+    return 0;
+  }
+}));
+
+const mapStateToProps = state => ({
+  custom_emojis: getCustomEmojis(state),
+  skinTone: state.getIn(['settings', 'skinTone']),
+  frequentlyUsedEmojis: getFrequentlyUsedEmojis(state),
+  dropdownPlacement: 'bottom',
+});
+
+const mapDispatchToProps = (dispatch, { onPickEmoji }) => ({
+  onSkinTone: skinTone => {
+    dispatch(changeSetting(['skinTone'], skinTone));
+  },
+
+  onPickEmoji: emoji => {
+    dispatch(useEmoji(emoji));
+
+    if (onPickEmoji) {
+      onPickEmoji(emoji);
+    }
+  },
+});
+
+export default connect(mapStateToProps, mapDispatchToProps)(ReactionPickerDropdown);

app/javascript/mastodon/containers/status_container.js

@@ -17,6 +17,8 @@ import {
   unbookmark,
   pin,
   unpin,
+  addEmojiReaction,
+  removeEmojiReaction,
 } from '../actions/interactions';
 import {
   muteStatus,
@@ -51,6 +53,9 @@ import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { boostModal, deleteModal, unfollowModal, unsubscribeModal } from '../initial_state';
 import { showAlertForError } from '../actions/alerts';
 
+import { createSelector } from 'reselect';
+import { Map as ImmutableMap } from 'immutable';
+
 const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
   deleteMessage: { id: 'confirmations.delete.message', defaultMessage: 'Are you sure you want to delete this status?' },
@@ -68,10 +73,12 @@ const messages = defineMessages({
 const makeMapStateToProps = () => {
   const getStatus = makeGetStatus();
   const getPictureInPicture = makeGetPictureInPicture();
+  const customEmojiMap = createSelector([state => state.get('custom_emojis')], items => items.reduce((map, emoji) => map.set(emoji.get('shortcode'), emoji), ImmutableMap()));
 
   const mapStateToProps = (state, props) => ({
     status: getStatus(state, props),
     pictureInPicture: getPictureInPicture(state, props),
+    emojiMap: customEmojiMap(state),
   });
 
   return mapStateToProps;
@@ -293,6 +300,14 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
     }));
   },
 
+  addEmojiReaction (status, name, domain, url, static_url) {
+    dispatch(addEmojiReaction(status, name, domain, url, static_url));
+  },
+
+  removeEmojiReaction (status) {
+    dispatch(removeEmojiReaction(status));
+  },
+
 });
 
 export default injectIntl(connect(makeMapStateToProps, mapDispatchToProps)(Status));

app/javascript/mastodon/features/emoji_reactioned_statuses/index.js

@@ -0,0 +1,102 @@
+import React from 'react';
+import { connect } from 'react-redux';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { fetchEmojiReactionedStatuses, expandEmojiReactionedStatuses } from '../../actions/emoji_reactions';
+import Column from '../ui/components/column';
+import ColumnHeader from '../../components/column_header';
+import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
+import StatusList from '../../components/status_list';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import { debounce } from 'lodash';
+
+const messages = defineMessages({
+  heading: { id: 'column.emoji_reactions', defaultMessage: 'EmojiReactions' },
+});
+
+const mapStateToProps = state => ({
+  statusIds: state.getIn(['status_lists', 'emoji_reactions', 'items']),
+  isLoading: state.getIn(['status_lists', 'emoji_reactions', 'isLoading'], true),
+  hasMore: !!state.getIn(['status_lists', 'emoji_reactions', 'next']),
+});
+
+export default @connect(mapStateToProps)
+@injectIntl
+class EmojiReactions extends ImmutablePureComponent {
+
+  static propTypes = {
+    dispatch: PropTypes.func.isRequired,
+    statusIds: ImmutablePropTypes.list.isRequired,
+    intl: PropTypes.object.isRequired,
+    columnId: PropTypes.string,
+    multiColumn: PropTypes.bool,
+    hasMore: PropTypes.bool,
+    isLoading: PropTypes.bool,
+  };
+
+  componentWillMount () {
+    this.props.dispatch(fetchEmojiReactionedStatuses());
+  }
+
+  handlePin = () => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(removeColumn(columnId));
+    } else {
+      dispatch(addColumn('EMOJI_REACTIONS', {}));
+    }
+  }
+
+  handleMove = (dir) => {
+    const { columnId, dispatch } = this.props;
+    dispatch(moveColumn(columnId, dir));
+  }
+
+  handleHeaderClick = () => {
+    this.column.scrollTop();
+  }
+
+  setRef = c => {
+    this.column = c;
+  }
+
+  handleLoadMore = debounce(() => {
+    this.props.dispatch(expandEmojiReactionedStatuses());
+  }, 300, { leading: true })
+
+  render () {
+    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
+    const pinned = !!columnId;
+
+    const emptyMessage = <FormattedMessage id='empty_column.emoji_reactioned_statuses' defaultMessage="You don't have any reaction posts yet. When you reaction one, it will show up here." />;
+
+    return (
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>
+        <ColumnHeader
+          icon='star'
+          title={intl.formatMessage(messages.heading)}
+          onPin={this.handlePin}
+          onMove={this.handleMove}
+          onClick={this.handleHeaderClick}
+          pinned={pinned}
+          multiColumn={multiColumn}
+          showBackButton
+        />
+
+        <StatusList
+          trackScroll={!pinned}
+          statusIds={statusIds}
+          scrollKey={`emoji_reactioned_statuses-${columnId}`}
+          hasMore={hasMore}
+          isLoading={isLoading}
+          onLoadMore={this.handleLoadMore}
+          emptyMessage={emptyMessage}
+          bindToDocument={!multiColumn}
+        />
+      </Column>
+    );
+  }
+
+}

app/javascript/mastodon/features/emoji_reactions/index.js

@@ -0,0 +1,87 @@
+import React from 'react';
+import { connect } from 'react-redux';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import LoadingIndicator from '../../components/loading_indicator';
+import { fetchEmojiReactions } from '../../actions/interactions';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import AccountContainer from '../../containers/account_container';
+import Column from '../ui/components/column';
+import ScrollableList from '../../components/scrollable_list';
+import Icon from 'mastodon/components/icon';
+import ColumnHeader from '../../components/column_header';
+
+const messages = defineMessages({
+  refresh: { id: 'refresh', defaultMessage: 'Refresh' },
+});
+
+const mapStateToProps = (state, props) => ({
+  accountIds: state.getIn(['user_lists', 'emoji_reactioned_by', props.params.statusId]),
+});
+
+export default @connect(mapStateToProps)
+@injectIntl
+class EmojiReactions extends ImmutablePureComponent {
+
+  static propTypes = {
+    params: PropTypes.object.isRequired,
+    dispatch: PropTypes.func.isRequired,
+    accountIds: ImmutablePropTypes.list,
+    multiColumn: PropTypes.bool,
+    intl: PropTypes.object.isRequired,
+  };
+
+  componentWillMount () {
+    if (!this.props.accountIds) {
+      this.props.dispatch(fetchEmojiReactions(this.props.params.statusId));
+    }
+  }
+
+  componentWillReceiveProps (nextProps) {
+    if (nextProps.params.statusId !== this.props.params.statusId && nextProps.params.statusId) {
+      this.props.dispatch(fetchEmojiReactions(nextProps.params.statusId));
+    }
+  }
+
+  handleRefresh = () => {
+    this.props.dispatch(fetchEmojiReactions(this.props.params.statusId));
+  }
+
+  render () {
+    const { intl, accountIds, multiColumn } = this.props;
+
+    if (!accountIds) {
+      return (
+        <Column>
+          <LoadingIndicator />
+        </Column>
+      );
+    }
+
+    const emptyMessage = <FormattedMessage id='empty_column.emoji_reactions' defaultMessage='No one has reactioned this post yet. When someone does, they will show up here.' />;
+
+    return (
+      <Column bindToDocument={!multiColumn}>
+        <ColumnHeader
+          showBackButton
+          multiColumn={multiColumn}
+          extraButton={(
+            <button className='column-header__button' title={intl.formatMessage(messages.refresh)} aria-label={intl.formatMessage(messages.refresh)} onClick={this.handleRefresh}><Icon id='refresh' /></button>
+          )}
+        />
+
+        <ScrollableList
+          scrollKey='emoji_reactions'
+          emptyMessage={emptyMessage}
+          bindToDocument={!multiColumn}
+        >
+          {accountIds.map(id =>
+            <AccountContainer key={id} id={id} withNote={false} />,
+          )}
+        </ScrollableList>
+      </Column>
+    );
+  }
+
+}

app/javascript/mastodon/features/favourited_statuses/index.js

@@ -70,7 +70,7 @@ class Favourites extends ImmutablePureComponent {
     const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
     const pinned = !!columnId;
 
-    const emptyMessage = <FormattedMessage id='empty_column.favourited_statuses' defaultMessage="You don't have any favourite toots yet. When you favourite one, it will show up here." />;
+    const emptyMessage = <FormattedMessage id='empty_column.favourited_statuses' defaultMessage="You don't have any favourite posts yet. When you favourite one, it will show up here." />;
 
     return (
       <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>

app/javascript/mastodon/features/favourites/index.js

@@ -59,7 +59,7 @@ class Favourites extends ImmutablePureComponent {
       );
     }
 
-    const emptyMessage = <FormattedMessage id='empty_column.favourites' defaultMessage='No one has favourited this toot yet. When someone does, they will show up here.' />;
+    const emptyMessage = <FormattedMessage id='empty_column.favourites' defaultMessage='No one has favourited this post yet. When someone does, they will show up here.' />;
 
     return (
       <Column bindToDocument={!multiColumn}>

app/javascript/mastodon/features/getting_started/index.js

@@ -31,6 +31,7 @@ const messages = defineMessages({
   preferences: { id: 'navigation_bar.preferences', defaultMessage: 'Preferences' },
   follow_requests: { id: 'navigation_bar.follow_requests', defaultMessage: 'Follow requests' },
   favourites: { id: 'navigation_bar.favourites', defaultMessage: 'Favourites' },
+  emoji_reactions: { id: 'navigation_bar.emoji_reactions', defaultMessage: 'Emoji reactions' },
   blocks: { id: 'navigation_bar.blocks', defaultMessage: 'Blocked users' },
   domain_blocks: { id: 'navigation_bar.domain_blocks', defaultMessage: 'Hidden domains' },
   mutes: { id: 'navigation_bar.mutes', defaultMessage: 'Muted users' },
@@ -214,6 +215,7 @@ class GettingStarted extends ImmutablePureComponent {
       <ColumnLink key='direct' icon='envelope' text={intl.formatMessage(messages.direct)} to='/timelines/direct' />,
       <ColumnLink key='bookmark' icon='bookmark' text={intl.formatMessage(messages.bookmarks)} to='/bookmarks' />,
       <ColumnLink key='favourites' icon='star' text={intl.formatMessage(messages.favourites)} to='/favourites' />,
+      <ColumnLink key='emoji_reactions' icon='smile-o' text={intl.formatMessage(messages.emoji_reactions)} to='/emoji_reactions' />,
       <ColumnLink key='lists' icon='list-ul' text={intl.formatMessage(messages.lists)} to='/lists' />,
       <ColumnLink key='circles' icon='user-circle' text={intl.formatMessage(messages.circles)} to='/circles' />,
     );

app/javascript/mastodon/features/keyboard_shortcuts/index.js

@@ -128,6 +128,10 @@ class KeyboardShortcuts extends ImmutablePureComponent {
                 <td><kbd>g</kbd>+<kbd>f</kbd></td>
                 <td><FormattedMessage id='keyboard_shortcuts.favourites' defaultMessage='to open favourites list' /></td>
               </tr>
+              <tr>
+                <td><kbd>g</kbd>+<kbd>e</kbd></td>
+                <td><FormattedMessage id='keyboard_shortcuts.emoji_reaction' defaultMessage='to open emoji reactions list' /></td>
+              </tr>
               <tr>
                 <td><kbd>g</kbd>+<kbd>p</kbd></td>
                 <td><FormattedMessage id='keyboard_shortcuts.pinned' defaultMessage='to open pinned toots list' /></td>

app/javascript/mastodon/features/notifications/components/column_settings.js

@@ -152,6 +152,17 @@ export default class ColumnSettings extends React.PureComponent {
             <SettingToggle prefix='notifications' settings={settings} settingPath={['sounds', 'status']} onChange={onChange} label={soundStr} />
           </div>
         </div>
+
+        <div role='group' aria-labelledby='notifications-reaction'>
+          <span id='notifications-reaction' className='column-settings__section'><FormattedMessage id='notifications.column_settings.emoji_reaction' defaultMessage='Reactions:' /></span>
+
+          <div className='column-settings__row'>
+            <SettingToggle disabled={browserPermission === 'denied'} prefix='notifications_desktop' settings={settings} settingPath={['alerts', 'emoji_reaction']} onChange={onChange} label={alertStr} />
+            {showPushSettings && <SettingToggle prefix='notifications_push' settings={pushSettings} settingPath={['alerts', 'emoji_reaction']} onChange={this.onPushChange} label={pushStr} />}
+            <SettingToggle prefix='notifications' settings={settings} settingPath={['shows', 'emoji_reaction']} onChange={onChange} label={showStr} />
+            <SettingToggle prefix='notifications' settings={settings} settingPath={['sounds', 'emoji_reaction']} onChange={onChange} label={soundStr} />
+          </div>
+        </div>
       </div>
     );
   }

app/javascript/mastodon/features/notifications/components/filter_bar.js

@@ -10,6 +10,7 @@ const tooltips = defineMessages({
   polls: { id: 'notifications.filter.polls', defaultMessage: 'Poll results' },
   follows: { id: 'notifications.filter.follows', defaultMessage: 'Follows' },
   statuses: { id: 'notifications.filter.statuses', defaultMessage: 'Updates from people you follow' },
+  reactions: { id: 'notifications.filter.emoji_reactions', defaultMessage: 'Reactions' },
 });
 
 export default @injectIntl
@@ -95,6 +96,13 @@ class FilterBar extends React.PureComponent {
         >
           <Icon id='home' fixedWidth />
         </button>
+        <button
+          className={selectedFilter === 'emoji_reaction' ? 'active' : ''}
+          onClick={this.onClick('emoji_reaction')}
+          title={intl.formatMessage(tooltips.reactions)}
+        >
+          <Icon id='smile-o' fixedWidth />
+        </button>
         <button
           className={selectedFilter === 'follow' ? 'active' : ''}
           onClick={this.onClick('follow')}

app/javascript/mastodon/features/notifications/components/notification.js

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { Fragment } from 'react';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import { injectIntl, FormattedMessage, defineMessages } from 'react-intl';
 import { HotKeys } from 'react-hotkeys';
@@ -8,17 +8,19 @@ import { me } from 'mastodon/initial_state';
 import StatusContainer from 'mastodon/containers/status_container';
 import AccountContainer from 'mastodon/containers/account_container';
 import FollowRequestContainer from '../containers/follow_request_container';
+import Emoji from 'mastodon/components/emoji';
 import Icon from 'mastodon/components/icon';
 import Permalink from 'mastodon/components/permalink';
 import classNames from 'classnames';
 
 const messages = defineMessages({
-  favourite: { id: 'notification.favourite', defaultMessage: '{name} favourited your status' },
+  favourite: { id: 'notification.favourite', defaultMessage: '{name} favourited your post' },
   follow: { id: 'notification.follow', defaultMessage: '{name} followed you' },
   ownPoll: { id: 'notification.own_poll', defaultMessage: 'Your poll has ended' },
   poll: { id: 'notification.poll', defaultMessage: 'A poll you have voted in has ended' },
-  reblog: { id: 'notification.reblog', defaultMessage: '{name} boosted your status' },
+  reblog: { id: 'notification.reblog', defaultMessage: '{name} boosted your post' },
   status: { id: 'notification.status', defaultMessage: '{name} just posted' },
+  emoji_reaction: { id: 'notification.emoji_reaction', defaultMessage: '{name} reactioned your post' },
 });
 
 const notificationForScreenReader = (intl, message, timestamp) => {
@@ -52,6 +54,7 @@ class Notification extends ImmutablePureComponent {
     cacheMediaWidth: PropTypes.func,
     cachedMediaWidth: PropTypes.number,
     unread: PropTypes.bool,
+    emojiMap: ImmutablePropTypes.map,
   };
 
   handleMoveUp = () => {
@@ -189,7 +192,7 @@ class Notification extends ImmutablePureComponent {
             </div>
 
             <span title={notification.get('created_at')}>
-              <FormattedMessage id='notification.favourite' defaultMessage='{name} favourited your status' values={{ name: link }} />
+              <FormattedMessage id='notification.favourite' defaultMessage='{name} favourited your post' values={{ name: link }} />
             </span>
           </div>
 
@@ -221,7 +224,7 @@ class Notification extends ImmutablePureComponent {
             </div>
 
             <span title={notification.get('created_at')}>
-              <FormattedMessage id='notification.reblog' defaultMessage='{name} boosted your status' values={{ name: link }} />
+              <FormattedMessage id='notification.reblog' defaultMessage='{name} boosted your post' values={{ name: link }} />
             </span>
           </div>
 
@@ -311,6 +314,42 @@ class Notification extends ImmutablePureComponent {
     );
   }
 
+  renderReaction (notification, link) {
+    const { intl, unread, emojiMap } = this.props;
+
+    if (!notification.get('emoji_reaction')) {
+      return <Fragment></Fragment>
+    }
+
+    return (
+      <HotKeys handlers={this.getHandlers()}>
+        <div className={classNames('notification notification-reaction focusable', { unread })} tabIndex='0' aria-label={notificationForScreenReader(intl, intl.formatMessage(messages.emoji_reaction, { name: notification.getIn(['account', 'acct']) }), notification.get('created_at'))}>
+          <div className='notification__message'>
+            <div className='notification__favourite-icon-wrapper'>
+              <Emoji hovered={false} emoji={notification.getIn(['emoji_reaction', 'name'])} emojiMap={emojiMap} url={notification.getIn(['emoji_reaction', 'url'])} static_url={notification.getIn(['emoji_reaction', 'static_url'])} />
+            </div>
+
+            <span title={notification.get('created_at')}>
+              <FormattedMessage id='notification.emoji_reaction' defaultMessage='{name} reactioned your post' values={{ name: link }} />
+            </span>
+          </div>
+
+          <StatusContainer
+            id={notification.get('status')}
+            account={notification.get('account')}
+            muted
+            withDismiss
+            hidden={!!this.props.hidden}
+            getScrollPosition={this.props.getScrollPosition}
+            updateScrollBottom={this.props.updateScrollBottom}
+            cachedMediaWidth={this.props.cachedMediaWidth}
+            cacheMediaWidth={this.props.cacheMediaWidth}
+          />
+        </div>
+      </HotKeys>
+    );
+  }
+
   render () {
     const { notification } = this.props;
     const account          = notification.get('account');
@@ -332,9 +371,11 @@ class Notification extends ImmutablePureComponent {
       return this.renderStatus(notification, link);
     case 'poll':
       return this.renderPoll(notification, account);
+    case 'emoji_reaction':
+      return this.renderReaction(notification, link);
     }
 
     return null;
-  }
+  };
 
 }

app/javascript/mastodon/features/notifications/containers/notification_container.js

@@ -14,16 +14,20 @@ import {
   revealStatus,
 } from '../../../actions/statuses';
 import { boostModal } from '../../../initial_state';
+import { createSelector } from 'reselect';
+import { Map as ImmutableMap } from 'immutable';
 
 const makeMapStateToProps = () => {
   const getNotification = makeGetNotification();
   const getStatus = makeGetStatus();
+  const customEmojiMap = createSelector([state => state.get('custom_emojis')], items => items.reduce((map, emoji) => map.set(emoji.get('shortcode'), emoji), ImmutableMap()));
 
   const mapStateToProps = (state, props) => {
     const notification = getNotification(state, props.notification, props.accountId);
     return {
       notification: notification,
       status: notification.get('status') ? getStatus(state, { id: notification.get('status') }) : null,
+      emojiMap: customEmojiMap(state),
     };
   };
 

app/javascript/mastodon/features/status/components/action_bar.js

@@ -5,8 +5,9 @@ import IconButton from '../../../components/icon_button';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import DropdownMenuContainer from '../../../containers/dropdown_menu_container';
 import { defineMessages, injectIntl } from 'react-intl';
-import { me, isStaff, show_quote_button } from '../../../initial_state';
+import { me, isStaff, show_quote_button, enableReaction } from '../../../initial_state';
 import classNames from 'classnames';
+import ReactionPickerDropdown from 'mastodon/containers/reaction_picker_dropdown_container';
 
 const messages = defineMessages({
   delete: { id: 'status.delete', defaultMessage: 'Delete' },
@@ -78,6 +79,8 @@ class ActionBar extends React.PureComponent {
     onPin: PropTypes.func,
     onEmbed: PropTypes.func,
     intl: PropTypes.object.isRequired,
+    addEmojiReaction: PropTypes.func.isRequired,
+    removeEmojiReaction: PropTypes.func.isRequired,
   };
 
   handleReplyClick = () => {
@@ -205,6 +208,16 @@ class ActionBar extends React.PureComponent {
     }
   }
 
+  handleEmojiPick = data => {
+    const { addEmojiReaction, status } = this.props;
+    addEmojiReaction(status, data.native.replace(/:/g, ''), null, null, null);
+  }
+
+  handleEmojiRemove = () => {
+    const { removeEmojiReaction, status } = this.props;
+    removeEmojiReaction(status);
+  }
+
   render () {
     const { status, relationship, intl } = this.props;
 
@@ -312,6 +325,7 @@ class ActionBar extends React.PureComponent {
         <div className='detailed-status__button'><IconButton className={classNames({ reblogPrivate })} disabled={!publicStatus && !reblogPrivate || expired} active={status.get('reblogged')} title={reblogTitle} icon='retweet' onClick={this.handleReblogClick} /></div>
         <div className='detailed-status__button'><IconButton className='star-icon' animate active={status.get('favourited')} title={intl.formatMessage(messages.favourite)} icon='star' onClick={this.handleFavouriteClick} /></div>
         {show_quote_button && <div className='detailed-status__button'><IconButton disabled={!publicStatus || expired} title={!publicStatus ? intl.formatMessage(messages.cannot_quote) : intl.formatMessage(messages.quote)} icon='quote-right' onClick={this.handleQuoteClick} /></div>}
+        {enableReaction && <div className='detailed-status__button'><ReactionPickerDropdown disabled={expired} active={status.get('emoji_reactioned')} pressed={status.get('emoji_reactioned')} iconButtonClass='detailed-status__action-bar-button' onPickEmoji={this.handleEmojiPick} onRemoveEmoji={this.handleEmojiRemove} /></div>}
         {shareButton}
         <div className='detailed-status__button'><IconButton className='bookmark-icon' active={status.get('bookmarked')} title={intl.formatMessage(messages.bookmark)} icon='bookmark' onClick={this.handleBookmarkClick} /></div>
 

app/javascript/mastodon/features/status/components/detailed_status.js

@@ -16,7 +16,9 @@ import scheduleIdleTask from '../../ui/util/schedule_idle_task';
 import classNames from 'classnames';
 import Icon from 'mastodon/components/icon';
 import AnimatedNumber from 'mastodon/components/animated_number';
+import EmojiReactionsBar from 'mastodon/components/emoji_reactions_bar';
 import PictureInPicturePlaceholder from 'mastodon/components/picture_in_picture_placeholder';
+import { enableReaction } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   public_short: { id: 'privacy.public.short', defaultMessage: 'Public' },
@@ -88,6 +90,9 @@ class DetailedStatus extends ImmutablePureComponent {
     onQuoteToggleHidden: PropTypes.func.isRequired,
     showQuoteMedia: PropTypes.bool,
     onToggleQuoteMediaVisibility: PropTypes.func,
+    emojiMap: ImmutablePropTypes.map,
+    addEmojiReaction: PropTypes.func.isRequired,
+    removeEmojiReaction: PropTypes.func.isRequired,
   };
 
   state = {
@@ -183,6 +188,11 @@ class DetailedStatus extends ImmutablePureComponent {
     let reblogLink = '';
     let reblogIcon = 'retweet';
     let favouriteLink = '';
+    let emojiReactionLink = '';
+
+    const reblogsCount = status.get('reblogs_count');
+    const favouritesCount = status.get('favourites_count');
+    const emojiReactionsCount = status.get('emoji_reactions').reduce( (accumulator, reaction) => accumulator + reaction.get('count'), 0 );
 
     if (this.props.measureHeight) {
       outerStyle.height = `${this.state.height}px`;
@@ -356,7 +366,7 @@ class DetailedStatus extends ImmutablePureComponent {
           <Link to={`/statuses/${status.get('id')}/reblogs`} className='detailed-status__link'>
             <Icon id={reblogIcon} />
             <span className='detailed-status__reblogs'>
-              <AnimatedNumber value={status.get('reblogs_count')} />
+              <AnimatedNumber value={reblogsCount} />
             </span>
           </Link>
         </Fragment>
@@ -368,7 +378,7 @@ class DetailedStatus extends ImmutablePureComponent {
           <a href={`/interact/${status.get('id')}?type=reblog`} className='detailed-status__link' onClick={this.handleModalLink}>
             <Icon id={reblogIcon} />
             <span className='detailed-status__reblogs'>
-              <AnimatedNumber value={status.get('reblogs_count')} />
+              <AnimatedNumber value={reblogsCount} />
             </span>
           </a>
         </Fragment>
@@ -380,7 +390,7 @@ class DetailedStatus extends ImmutablePureComponent {
         <Link to={`/statuses/${status.get('id')}/favourites`} className='detailed-status__link'>
           <Icon id='star' />
           <span className='detailed-status__favorites'>
-            <AnimatedNumber value={status.get('favourites_count')} />
+            <AnimatedNumber value={favouritesCount} />
           </span>
         </Link>
       );
@@ -389,7 +399,27 @@ class DetailedStatus extends ImmutablePureComponent {
         <a href={`/interact/${status.get('id')}?type=favourite`} className='detailed-status__link' onClick={this.handleModalLink}>
           <Icon id='star' />
           <span className='detailed-status__favorites'>
-            <AnimatedNumber value={status.get('favourites_count')} />
+            <AnimatedNumber value={favouritesCount} />
+          </span>
+        </a>
+      );
+    }
+
+    if (this.context.router) {
+      emojiReactionLink = (
+        <Link to={`/statuses/${status.get('id')}/emoji_reactions`} className='detailed-status__link'>
+          <Icon id='smile-o' />
+          <span className='detailed-status__emoji_reactions'>
+            <AnimatedNumber value={emojiReactionsCount} />
+          </span>
+        </Link>
+      );
+    } else {
+      emojiReactionLink = (
+        <a href={`/interact/${status.get('id')}?type=emoji_reactions`} className='detailed-status__link' onClick={this.handleModalLink}>
+          <Icon id='smile-o' />
+          <span className='detailed-status__emoji_reactions'>
+            <AnimatedNumber value={emojiReactionsCount} />
           </span>
         </a>
       );
@@ -412,6 +442,13 @@ class DetailedStatus extends ImmutablePureComponent {
           {quote}
           {media}
 
+          {enableReaction && <EmojiReactionsBar
+            status={status}
+            addEmojiReaction={this.props.addEmojiReaction}
+            removeEmojiReaction={this.props.removeEmojiReaction}
+            emojiMap={this.props.emojiMap}
+          />}
+
           <div className='detailed-status__meta'>
             <a className='detailed-status__datetime' href={status.get('url')} target='_blank' rel='noopener noreferrer'>
               <FormattedDate value={new Date(status.get('created_at'))} hour12={false} year='numeric' month='short' day='2-digit' hour='2-digit' minute='2-digit' />
@@ -423,7 +460,7 @@ class DetailedStatus extends ImmutablePureComponent {
                 </time>
               </span>
             }
-            {visibilityLink}{applicationLink}{reblogLink} · {favouriteLink}
+            {visibilityLink}{applicationLink}{reblogLink} · {favouriteLink} · {emojiReactionLink}
           </div>
         </div>
       </div>

app/javascript/mastodon/features/status/containers/detailed_status_container.js

@@ -13,6 +13,8 @@ import {
   unfavourite,
   pin,
   unpin,
+  addEmojiReaction,
+  removeEmojiReaction,
 } from '../../../actions/interactions';
 import {
   muteStatus,
@@ -32,6 +34,9 @@ import { defineMessages, injectIntl } from 'react-intl';
 import { boostModal, deleteModal } from '../../../initial_state';
 import { showAlertForError } from '../../../actions/alerts';
 
+import { createSelector } from 'reselect';
+import { Map as ImmutableMap } from 'immutable';
+
 const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
   deleteMessage: { id: 'confirmations.delete.message', defaultMessage: 'Are you sure you want to delete this status?' },
@@ -44,11 +49,13 @@ const messages = defineMessages({
 const makeMapStateToProps = () => {
   const getStatus = makeGetStatus();
   const getPictureInPicture = makeGetPictureInPicture();
+  const customEmojiMap = createSelector([state => state.get('custom_emojis')], items => items.reduce((map, emoji) => map.set(emoji.get('shortcode'), emoji), ImmutableMap()));
 
   const mapStateToProps = (state, props) => ({
     status: getStatus(state, props),
     domain: state.getIn(['meta', 'domain']),
     pictureInPicture: getPictureInPicture(state, props),
+    emojiMap: customEmojiMap(state),
   });
 
   return mapStateToProps;
@@ -182,6 +189,15 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
       dispatch(hideQuote(status.get('id')));
     }
   },
+
+  addEmojiReaction (status, name, domain, url, static_url) {
+    dispatch(addEmojiReaction(status, name, domain, url, static_url));
+  },
+
+  removeEmojiReaction (status) {
+    dispatch(removeEmojiReaction(status));
+  },
+
 });
 
 export default injectIntl(connect(makeMapStateToProps, mapDispatchToProps)(DetailedStatus));

app/javascript/mastodon/features/status/index.js

@@ -4,6 +4,7 @@ import { connect } from 'react-redux';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import ImmutablePropTypes from 'react-immutable-proptypes';
+import { Map as ImmutableMap } from 'immutable';
 import { createSelector } from 'reselect';
 import { fetchStatus } from '../../actions/statuses';
 import MissingIndicator from '../../components/missing_indicator';
@@ -19,6 +20,8 @@ import {
   unreblog,
   pin,
   unpin,
+  addEmojiReaction,
+  removeEmojiReaction,
 } from '../../actions/interactions';
 import {
   replyCompose,
@@ -79,6 +82,7 @@ const messages = defineMessages({
 const makeMapStateToProps = () => {
   const getStatus = makeGetStatus();
   const getPictureInPicture = makeGetPictureInPicture();
+  const customEmojiMap = createSelector([state => state.get('custom_emojis')], items => items.reduce((map, emoji) => map.set(emoji.get('shortcode'), emoji), ImmutableMap()));
 
   const getAncestorsIds = createSelector([
     (_, { id }) => id,
@@ -152,6 +156,7 @@ const makeMapStateToProps = () => {
       askReplyConfirmation: state.getIn(['compose', 'text']).trim().length !== 0,
       domain: state.getIn(['meta', 'domain']),
       pictureInPicture: getPictureInPicture(state, { id: props.params.statusId }),
+      emojiMap: customEmojiMap(state),
     };
   };
 
@@ -180,6 +185,7 @@ class Status extends ImmutablePureComponent {
       inUse: PropTypes.bool,
       available: PropTypes.bool,
     }),
+    emojiMap: ImmutablePropTypes.map,
   };
 
   state = {
@@ -451,6 +457,14 @@ class Status extends ImmutablePureComponent {
     this.handleToggleMediaVisibility();
   }
 
+  handleAddEmojiReaction = (status, name, domain, url, static_url) => {
+    this.props.dispatch(addEmojiReaction(status, name, domain, url, static_url));
+  }
+
+  handleRemoveEmojiReaction = (status) => {
+    this.props.dispatch(removeEmojiReaction(status));
+  }
+
   handleMoveUp = id => {
     const { status, ancestorsIds, descendantsIds } = this.props;
 
@@ -542,7 +556,7 @@ class Status extends ImmutablePureComponent {
 
   render () {
     let ancestors, descendants;
-    const { status, ancestorsIds, descendantsIds, intl, domain, multiColumn, pictureInPicture } = this.props;
+    const { status, ancestorsIds, descendantsIds, intl, domain, multiColumn, pictureInPicture, emojiMap } = this.props;
     const { fullscreen } = this.state;
 
     if (status === null) {
@@ -606,6 +620,9 @@ class Status extends ImmutablePureComponent {
                   onQuoteToggleHidden={this.handleQuoteToggleHidden}
                   showQuoteMedia={this.state.showQuoteMedia}
                   onToggleQuoteMediaVisibility={this.handleToggleQuoteMediaVisibility}
+                  emojiMap={emojiMap}
+                  addEmojiReaction={this.handleAddEmojiReaction}
+                  removeEmojiReaction={this.handleRemoveEmojiReaction}
                 />
 
                 <ActionBar
@@ -630,6 +647,8 @@ class Status extends ImmutablePureComponent {
                   onReport={this.handleReport}
                   onPin={this.handlePin}
                   onEmbed={this.handleEmbed}
+                  addEmojiReaction={this.handleAddEmojiReaction}
+                  removeEmojiReaction={this.handleRemoveEmojiReaction}
                 />
               </div>
             </HotKeys>

app/javascript/mastodon/features/ui/components/navigation_panel.js

@@ -22,6 +22,7 @@ const NavigationPanel = () => (
     <NavLink className='column-link column-link--transparent' to='/timelines/direct'><Icon className='column-link__icon' id='envelope' fixedWidth /><FormattedMessage id='navigation_bar.direct' defaultMessage='Direct messages' /></NavLink>
     <NavLink className='column-link column-link--transparent' to='/favourites'><Icon className='column-link__icon' id='star' fixedWidth /><FormattedMessage id='navigation_bar.favourites' defaultMessage='Favourites' /></NavLink>
     <NavLink className='column-link column-link--transparent' to='/bookmarks'><Icon className='column-link__icon' id='bookmark' fixedWidth /><FormattedMessage id='navigation_bar.bookmarks' defaultMessage='Bookmarks' /></NavLink>
+    <NavLink className='column-link column-link--transparent' to='/emoji_reactions'><Icon className='column-link__icon' id='smile-o' fixedWidth /><FormattedMessage id='navigation_bar.emoji_reactions' defaultMessage='Emoji reactions' /></NavLink>
     <NavLink className='column-link column-link--transparent' to='/lists'><Icon className='column-link__icon' id='list-ul' fixedWidth /><FormattedMessage id='navigation_bar.lists' defaultMessage='Lists' /></NavLink>
     <NavLink className='column-link column-link--transparent' to='/circles'><Icon className='column-link__icon' id='user-circle' fixedWidth /><FormattedMessage id='navigation_bar.circles' defaultMessage='Circles' /></NavLink>
     <NavLink className='column-link column-link--transparent' to='/group_directory'><Icon className='column-link__icon' id='address-book-o' fixedWidth /><FormattedMessage id='getting_started.group_directory' defaultMessage='Group directory' /></NavLink>

app/javascript/mastodon/features/ui/index.js

@@ -39,6 +39,7 @@ import {
   Subscribing,
   Reblogs,
   Favourites,
+  EmojiReactions,
   Mentions,
   DirectTimeline,
   LimitedTimeline,
@@ -48,6 +49,7 @@ import {
   GenericNotFound,
   FavouritedStatuses,
   BookmarkedStatuses,
+  EmojiReactionedStatuses,
   ListTimeline,
   Blocks,
   DomainBlocks,
@@ -106,6 +108,7 @@ const keyMap = {
   goToDirect: 'g d',
   goToStart: 'g s',
   goToFavourites: 'g f',
+  goToEmojiReactions: 'g e',
   goToPinned: 'g p',
   goToProfile: 'g u',
   goToBlocked: 'g b',
@@ -173,6 +176,7 @@ class SwitchingColumnsArea extends React.PureComponent {
           <WrappedRoute path='/notifications' component={Notifications} content={children} />
           <WrappedRoute path='/favourites' component={FavouritedStatuses} content={children} />
           <WrappedRoute path='/bookmarks' component={BookmarkedStatuses} content={children} />
+          <WrappedRoute path='/emoji_reactions' component={EmojiReactionedStatuses} content={children} />
           <WrappedRoute path='/pinned' component={PinnedStatuses} content={children} />
 
           <WrappedRoute path='/start' component={FollowRecommendations} content={children} />
@@ -186,6 +190,7 @@ class SwitchingColumnsArea extends React.PureComponent {
           <WrappedRoute path='/statuses/:statusId' exact component={Status} content={children} />
           <WrappedRoute path='/statuses/:statusId/reblogs' component={Reblogs} content={children} />
           <WrappedRoute path='/statuses/:statusId/favourites' component={Favourites} content={children} />
+          <WrappedRoute path='/statuses/:statusId/emoji_reactions' component={EmojiReactions} content={children} />
           <WrappedRoute path='/statuses/:statusId/mentions' component={Mentions} content={children} />
 
           <WrappedRoute path='/accounts/:accountId' exact component={AccountTimeline} content={children} />
@@ -494,6 +499,10 @@ class UI extends React.PureComponent {
     this.context.router.history.push('/favourites');
   }
 
+  handleHotkeyGoToEmojiReactions = () => {
+    this.context.router.history.push('/emoji_reactions');
+  }
+
   handleHotkeyGoToPinned = () => {
     this.context.router.history.push('/pinned');
   }
@@ -532,6 +541,7 @@ class UI extends React.PureComponent {
       goToDirect: this.handleHotkeyGoToDirect,
       goToStart: this.handleHotkeyGoToStart,
       goToFavourites: this.handleHotkeyGoToFavourites,
+      goToEmojiReactions: this.handleHotkeyGoToEmojiReactions,
       goToPinned: this.handleHotkeyGoToPinned,
       goToProfile: this.handleHotkeyGoToProfile,
       goToBlocked: this.handleHotkeyGoToBlocked,

app/javascript/mastodon/features/ui/util/async-components.js

@@ -90,6 +90,10 @@ export function Favourites () {
   return import(/* webpackChunkName: "features/favourites" */'../../favourites');
 }
 
+export function EmojiReactions () {
+  return import(/* webpackChunkName: "features/emoji_reactions" */'../../emoji_reactions');
+}
+
 export function Mentions () {
   return import(/* webpackChunkName: "features/mentions" */'../../mentions');
 }
@@ -110,6 +114,10 @@ export function BookmarkedStatuses () {
   return import(/* webpackChunkName: "features/bookmarked_statuses" */'../../bookmarked_statuses');
 }
 
+export function EmojiReactionedStatuses () {
+  return import(/* webpackChunkName: "features/emoji_reactioned_statuses" */'../../emoji_reactioned_statuses');
+}
+
 export function Blocks () {
   return import(/* webpackChunkName: "features/blocks" */'../../blocks');
 }

app/javascript/mastodon/initial_state.js

@@ -39,5 +39,6 @@ export const show_target = getMeta('show_target');
 export const place_tab_bar_at_bottom = getMeta('place_tab_bar_at_bottom');
 export const show_tab_bar_label = getMeta('show_tab_bar_label');
 export const enable_limited_timeline = getMeta('enable_limited_timeline');
+export const enableReaction = getMeta('enable_reaction');
 
 export default initialState;

app/javascript/mastodon/locales/en.json

@@ -90,6 +90,7 @@
   "column.directory": "Browse profiles",
   "column.group_directory": "Browse groups",
   "column.domain_blocks": "Blocked domains",
+  "column.emoji_reactions": "EmojiReactions",
   "column.favourites": "Favourites",
   "column.follow_requests": "Follow requests",
   "column.group": "Group timeline",
@@ -194,6 +195,8 @@
   "empty_column.community": "The local timeline is empty. Write something publicly to get the ball rolling!",
   "empty_column.direct": "You don't have any direct messages yet. When you send or receive one, it will show up here.",
   "empty_column.domain_blocks": "There are no blocked domains yet.",
+  "empty_column.emoji_reactioned_statuses": "You don't have any reaction posts yet. When you reaction one, it will show up here.",
+  "empty_column.emoji_reactions": "No one has reactioned this post yet. When someone does, they will show up here.",
   "empty_column.favourited_statuses": "You don't have any favourite posts yet. When you favourite one, it will show up here.",
   "empty_column.favourites": "No one has favourited this post yet. When someone does, they will show up here.",
   "empty_column.follow_recommendations": "Looks like no suggestions could be generated for you. You can try using search to look for people you might know or explore trending hashtags.",
@@ -268,6 +271,7 @@
   "keyboard_shortcuts.description": "Description",
   "keyboard_shortcuts.direct": "Open direct messages column",
   "keyboard_shortcuts.down": "Move down in the list",
+  "keyboard_shortcuts.emoji_reaction": "Open emoji reactions list",
   "keyboard_shortcuts.enter": "Open post",
   "keyboard_shortcuts.favourite": "Favourite post",
   "keyboard_shortcuts.favourites": "Open favourites list",
@@ -337,6 +341,7 @@
   "navigation_bar.discover": "Discover",
   "navigation_bar.domain_blocks": "Blocked domains",
   "navigation_bar.edit_profile": "Edit profile",
+  "navigation_bar.emoji_reactions": "Emoji reactions",
   "navigation_bar.favourites": "Favourites",
   "navigation_bar.filters": "Muted words",
   "navigation_bar.follow_requests": "Follow requests",
@@ -373,6 +378,7 @@
   "notification.mention": "{name} mentioned you",
   "notification.own_poll": "Your poll has ended",
   "notification.poll": "A poll you have voted in has ended",
+  "notification.emoji_reaction": "{name} reactioned your post",
   "notification.reblog": "{name} boosted your post",
   "notification.status": "{name} just posted",
   "notifications.clear": "Clear notifications",
@@ -387,6 +393,7 @@
   "notifications.column_settings.mention": "Mentions:",
   "notifications.column_settings.poll": "Poll results:",
   "notifications.column_settings.push": "Push notifications",
+  "notifications.column_settings.emoji_reaction": "Reactions:",
   "notifications.column_settings.reblog": "Boosts:",
   "notifications.column_settings.show": "Show in column",
   "notifications.column_settings.sound": "Play sound",
@@ -398,6 +405,7 @@
   "notifications.filter.follows": "Follows",
   "notifications.filter.mentions": "Mentions",
   "notifications.filter.polls": "Poll results",
+  "notifications.filter.emoji_reactions": "Reactions",
   "notifications.filter.statuses": "Updates from people you follow",
   "notifications.grant_permission": "Grant permission.",
   "notifications.group": "{count} notifications",

app/javascript/mastodon/locales/ja.json

@@ -89,6 +89,7 @@
   "column.direct": "ダイレクトメッセージ",
   "column.directory": "ディレクトリ",
   "column.domain_blocks": "ブロックしたドメイン",
+  "column.emoji_reactions": "絵文字リアクション",
   "column.favourites": "お気に入り",
   "column.follow_requests": "フォローリクエスト",
   "column.group": "グループタイムライン",
@@ -194,6 +195,8 @@
   "empty_column.community": "ローカルタイムラインはまだ使われていません。何か書いてみましょう！",
   "empty_column.direct": "ダイレクトメッセージはまだありません。ダイレクトメッセージをやりとりすると、ここに表示されます。",
   "empty_column.domain_blocks": "ブロックしているドメインはありません。",
+  "empty_column.emoji_reactioned_statuses": "まだ何も絵文字リアクションしていません。絵文字リアクションするとここに表示されます。",
+  "empty_column.emoji_reactions": "まだ誰も絵文字リアクションしていません。絵文字リアクションされるとここに表示されます。",
   "empty_column.favourited_statuses": "まだ何もお気に入り登録していません。お気に入り登録するとここに表示されます。",
   "empty_column.favourites": "まだ誰もお気に入り登録していません。お気に入り登録されるとここに表示されます。",
   "empty_column.follow_recommendations": "おすすめを生成できませんでした。検索を使って知り合いを探したり、トレンドハッシュタグを見てみましょう。",
@@ -269,6 +272,7 @@
   "keyboard_shortcuts.description": "説明",
   "keyboard_shortcuts.direct": "ダイレクトメッセージのカラムを開く",
   "keyboard_shortcuts.down": "カラム内一つ下に移動",
+  "keyboard_shortcuts.emoji_reaction": "絵文字リアクションのリストを開く",
   "keyboard_shortcuts.enter": "投稿の詳細を表示",
   "keyboard_shortcuts.favourite": "お気に入り",
   "keyboard_shortcuts.favourites": "お気に入り登録のリストを開く",
@@ -338,6 +342,7 @@
   "navigation_bar.discover": "見つける",
   "navigation_bar.domain_blocks": "ブロックしたドメイン",
   "navigation_bar.edit_profile": "プロフィールを編集",
+  "navigation_bar.emoji_reactions": "絵文字リアクション",
   "navigation_bar.favourites": "お気に入り",
   "navigation_bar.filters": "フィルター設定",
   "navigation_bar.follow_requests": "フォローリクエスト",
@@ -374,6 +379,7 @@
   "notification.mention": "{name}さんがあなたに返信しました",
   "notification.own_poll": "アンケートが終了しました",
   "notification.poll": "アンケートが終了しました",
+  "notification.emoji_reaction": "{name}さんがあなたの投稿にリアクションしました",
   "notification.reblog": "{name}さんがあなたの投稿をブーストしました",
   "notification.status": "{name}さんが投稿しました",
   "notifications.clear": "通知を消去",
@@ -388,6 +394,7 @@
   "notifications.column_settings.mention": "返信:",
   "notifications.column_settings.poll": "アンケート結果:",
   "notifications.column_settings.push": "プッシュ通知",
+  "notifications.column_settings.emoji_reaction": "リアクション:",
   "notifications.column_settings.reblog": "ブースト:",
   "notifications.column_settings.show": "カラムに表示",
   "notifications.column_settings.sound": "通知音を再生",
@@ -399,6 +406,7 @@
   "notifications.filter.follows": "フォロー",
   "notifications.filter.mentions": "返信",
   "notifications.filter.polls": "アンケート結果",
+  "notifications.filter.emoji_reactions": "リアクション",
   "notifications.filter.statuses": "フォローしている人の新着情報",
   "notifications.grant_permission": "権限の付与",
   "notifications.group": "{count} 件の通知",

app/javascript/mastodon/reducers/notifications.js

@@ -52,6 +52,8 @@ const notificationToMap = notification => ImmutableMap({
   account: notification.account.id,
   created_at: notification.created_at,
   status: notification.status ? notification.status.id : null,
+  reaction: ImmutableMap(notification.reaction),
+  reblogVisibility: notification.reblog_visibility,
 });
 
 const normalizeNotification = (state, notification, usePendingItems) => {

app/javascript/mastodon/reducers/settings.js

@@ -53,6 +53,7 @@ const initialState = ImmutableMap({
       mention: false,
       poll: false,
       status: false,
+      emoji_reaction: false,
     }),
 
     quickFilter: ImmutableMap({
@@ -72,6 +73,7 @@ const initialState = ImmutableMap({
       mention: true,
       poll: true,
       status: true,
+      emoji_reaction: true,
     }),
 
     sounds: ImmutableMap({
@@ -82,6 +84,7 @@ const initialState = ImmutableMap({
       mention: true,
       poll: true,
       status: true,
+      emoji_reaction: true,
     }),
   }),
 

app/javascript/mastodon/reducers/status_lists.js

@@ -14,6 +14,14 @@ import {
   BOOKMARKED_STATUSES_EXPAND_SUCCESS,
   BOOKMARKED_STATUSES_EXPAND_FAIL,
 } from '../actions/bookmarks';
+import {
+  EMOJI_REACTIONED_STATUSES_FETCH_REQUEST,
+  EMOJI_REACTIONED_STATUSES_FETCH_SUCCESS,
+  EMOJI_REACTIONED_STATUSES_FETCH_FAIL,
+  EMOJI_REACTIONED_STATUSES_EXPAND_REQUEST,
+  EMOJI_REACTIONED_STATUSES_EXPAND_SUCCESS,
+  EMOJI_REACTIONED_STATUSES_EXPAND_FAIL,
+} from '../actions/emoji_reactions';
 import {
   PINNED_STATUSES_FETCH_SUCCESS,
 } from '../actions/pin_statuses';
@@ -23,6 +31,8 @@ import {
   UNFAVOURITE_SUCCESS,
   BOOKMARK_SUCCESS,
   UNBOOKMARK_SUCCESS,
+  EMOJI_REACTION_SUCCESS,
+  UN_EMOJI_REACTION_SUCCESS,
   PIN_SUCCESS,
   UNPIN_SUCCESS,
 } from '../actions/interactions';
@@ -38,6 +48,11 @@ const initialState = ImmutableMap({
     loaded: false,
     items: ImmutableList(),
   }),
+  emoji_reactions: ImmutableMap({
+    next: null,
+    loaded: false,
+    items: ImmutableList(),
+  }),
   pins: ImmutableMap({
     next: null,
     loaded: false,
@@ -96,6 +111,16 @@ export default function statusLists(state = initialState, action) {
     return normalizeList(state, 'bookmarks', action.statuses, action.next);
   case BOOKMARKED_STATUSES_EXPAND_SUCCESS:
     return appendToList(state, 'bookmarks', action.statuses, action.next);
+  case EMOJI_REACTIONED_STATUSES_FETCH_REQUEST:
+  case EMOJI_REACTIONED_STATUSES_EXPAND_REQUEST:
+    return state.setIn(['emoji_reactions', 'isLoading'], true);
+  case EMOJI_REACTIONED_STATUSES_FETCH_FAIL:
+  case EMOJI_REACTIONED_STATUSES_EXPAND_FAIL:
+    return state.setIn(['emoji_reactions', 'isLoading'], false);
+  case EMOJI_REACTIONED_STATUSES_FETCH_SUCCESS:
+    return normalizeList(state, 'emoji_reactions', action.statuses, action.next);
+  case EMOJI_REACTIONED_STATUSES_EXPAND_SUCCESS:
+    return appendToList(state, 'emoji_reactions', action.statuses, action.next);
   case FAVOURITE_SUCCESS:
     return prependOneToList(state, 'favourites', action.status);
   case UNFAVOURITE_SUCCESS:
@@ -104,6 +129,10 @@ export default function statusLists(state = initialState, action) {
     return prependOneToList(state, 'bookmarks', action.status);
   case UNBOOKMARK_SUCCESS:
     return removeOneFromList(state, 'bookmarks', action.status);
+  case EMOJI_REACTION_SUCCESS:
+    return prependOneToList(state, 'emoji_reactions', action.status);
+  case UN_EMOJI_REACTION_SUCCESS:
+    return removeOneFromList(state, 'emoji_reactions', action.status);
   case PINNED_STATUSES_FETCH_SUCCESS:
     return normalizeList(state, 'pins', action.statuses, action.next);
   case PIN_SUCCESS:

app/javascript/mastodon/reducers/statuses.js

@@ -6,6 +6,11 @@ import {
   UNFAVOURITE_SUCCESS,
   BOOKMARK_REQUEST,
   BOOKMARK_FAIL,
+  EMOJI_REACTION_REQUEST,
+  EMOJI_REACTION_FAIL,
+  UN_EMOJI_REACTION_REQUEST,
+  UN_EMOJI_REACTION_FAIL,
+  EMOJI_REACTION_UPDATE,
 } from '../actions/interactions';
 import {
   STATUS_MUTE_SUCCESS,
@@ -37,6 +42,24 @@ const deleteStatus = (state, id, references, quotes) => {
   return state.delete(id);
 };
 
+const updateEmojiReaction = (state, id, name, domain, url, static_url, updater) => state.update(id, status => {
+  return status.update('emoji_reactions', emojiReactions => {
+    const idx = emojiReactions.findIndex(emojiReaction => !domain && !emojiReaction.get('domain') && emojiReaction.get('name') === name || emojiReaction.get('name') === name && emojiReaction.get('domain', null) === domain);
+
+    if (idx > -1) {
+      return emojiReactions.update(idx, emojiReactions => updater(emojiReactions));
+    }
+
+    return emojiReactions.push(updater(fromJS({ name, domain, url, static_url, count: 0 })));
+  });
+});
+
+const updateEmojiReactionCount = (state, emojiReaction) => updateEmojiReaction(state, emojiReaction.status_id, emojiReaction.name, emojiReaction.domain, emojiReaction.url, emojiReaction.static_url, x => x.set('count', emojiReaction.count));
+
+const addEmojiReaction = (state, id, name, domain, url, static_url) => updateEmojiReaction(state, id, name, domain, url, static_url, x => x.set('me', true).update('count', y => y + 1));
+
+const removeEmojiReaction = (state, id, name, domain, url, static_url) => updateEmojiReaction(state, id, name, domain, url, static_url, x => x.set('me', false).update('count', y => y - 1));
+
 const initialState = ImmutableMap();
 
 export default function statuses(state = initialState, action) {
@@ -55,6 +78,22 @@ export default function statuses(state = initialState, action) {
     return state.get(action.status.get('id')) === undefined ? state : state.setIn([action.status.get('id'), 'bookmarked'], true);
   case BOOKMARK_FAIL:
     return state.get(action.status.get('id')) === undefined ? state : state.setIn([action.status.get('id'), 'bookmarked'], false);
+  case EMOJI_REACTION_UPDATE:
+    return state.get(action.emojiReaction.status_id) === undefined ? state : updateEmojiReactionCount(state, action.emojiReaction);
+  case EMOJI_REACTION_REQUEST:
+  case UN_EMOJI_REACTION_FAIL:
+    if (state.get(action.status.get('id')) !== undefined) {
+      state = state.setIn([action.status.get('id'), 'emoji_reactioned'], true);
+      state = addEmojiReaction(state, action.status.get('id'), action.name, action.domain, action.url, action.static_url);
+    }
+    return state;
+  case UN_EMOJI_REACTION_REQUEST:
+  case EMOJI_REACTION_FAIL:
+    if (state.get(action.status.get('id')) !== undefined) {
+      state = state.setIn([action.status.get('id'), 'emoji_reactioned'], false);
+      state = removeEmojiReaction(state, action.status.get('id'), action.name, action.domain, action.url, action.static_url);
+    }
+    return state;
   case REBLOG_REQUEST:
     return state.setIn([action.status.get('id'), 'reblogged'], true);
   case REBLOG_FAIL:

app/javascript/mastodon/reducers/user_lists.js

@@ -32,6 +32,7 @@ import {
 import {
   REBLOGS_FETCH_SUCCESS,
   FAVOURITES_FETCH_SUCCESS,
+  EMOJI_REACTIONS_FETCH_SUCCESS,
   MENTIONS_FETCH_SUCCESS,
 } from '../actions/interactions';
 import {
@@ -80,6 +81,7 @@ const initialState = ImmutableMap({
   subscribing: initialListState,
   reblogged_by: initialListState,
   favourited_by: initialListState,
+  emoji_reactioned_by: initialListState,
   mentioned_by: initialListState,
   follow_requests: initialListState,
   blocks: initialListState,
@@ -142,6 +144,8 @@ export default function userLists(state = initialState, action) {
     return state.setIn(['reblogged_by', action.id], ImmutableList(action.accounts.map(item => item.id)));
   case FAVOURITES_FETCH_SUCCESS:
     return state.setIn(['favourited_by', action.id], ImmutableList(action.accounts.map(item => item.id)));
+  case EMOJI_REACTIONS_FETCH_SUCCESS:
+    return state.setIn(['emoji_reactioned_by', action.id], ImmutableList(action.accounts.map(item => item.id)));
   case MENTIONS_FETCH_SUCCESS:
     return state.setIn(['mentioned_by', action.id], ImmutableList(action.accounts.map(item => item.id)));
   case NOTIFICATIONS_UPDATE:

app/javascript/styles/mastodon-light/diff.scss

@@ -369,14 +369,15 @@ html {
 }
 
 .reactions-bar__item {
-  &:hover,
-  &:focus,
-  &:active {
+  &:hover:enabled,
+  &:focus:enabled,
+  &:active:enabled {
     background-color: $ui-base-color;
   }
 }
 
-.reactions-bar__item.active {
+.reactions-bar__item.active:enabled,
+.reactions-bar__item.active:disabled {
   background-color: mix($white, $ui-highlight-color, 80%);
   border-color: mix(lighten($ui-base-color, 8%), $ui-highlight-color, 80%);
 }

app/javascript/styles/mastodon/components.scss

@@ -1284,19 +1284,26 @@
   align-items: center;
   display: flex;
   margin-top: 8px;
+
+  .emoji-picker-dropdown {
+    flex: 1 0 auto;
+    display: flex;
+  }
 }
 
 .status__action-bar-button {
-  margin-right: 18px;
+  flex: 1 0 auto;
 
-  &.icon-button--with-counter {
-    margin-right: 14px;
+  .icon-button__counter {
+    width: auto;
   }
 }
 
 .status__action-bar-dropdown {
+  flex: 0 0 auto;
   height: 23.15px;
   width: 23.15px;
+  margin-left: 4px
 }
 
 .detailed-status__action-bar-dropdown {
@@ -1367,6 +1374,7 @@
 }
 
 .detailed-status__favorites,
+.detailed-status__emoji_reactions,
 .detailed-status__reblogs {
   display: inline-block;
   font-weight: 500;
@@ -2754,7 +2762,7 @@ a.account__display-name {
 
 .column-actions {
   display: flex;
-  align-items: start;
+  align-items: flex-start;
   justify-content: center;
   padding: 40px;
   padding-top: 40px;
@@ -7695,9 +7703,9 @@ noscript {
       color: $darker-text-color;
     }
 
-    &:hover,
-    &:focus,
-    &:active {
+    &:hover:enabled,
+    &:focus:enabled,
+    &:active:enabled {
       background: lighten($ui-base-color, 16%);
       transition: all 200ms ease-out;
       transition-property: background-color, color;
@@ -7707,8 +7715,9 @@ noscript {
       }
     }
 
-    &.active {
-      transition: all 100ms ease-in;
+    &:enabled.active,
+    &:disabled.active {
+        transition: all 100ms ease-in;
       transition-property: background-color, color;
       background-color: mix(lighten($ui-base-color, 12%), $ui-highlight-color, 80%);
 

app/javascript/styles/mastodon/rtl.scss

@@ -264,6 +264,7 @@ body.rtl {
   }
 
   .detailed-status__favorites,
+  .detailed-status__emoji_reactions,
   .detailed-status__reblogs {
     margin-left: 0;
     margin-right: 6px;

app/lib/activitypub/activity.rb

@@ -56,6 +56,8 @@ class ActivityPub::Activity
         ActivityPub::Activity::Remove
       when 'Move'
         ActivityPub::Activity::Move
+      when 'EmojiReact'
+        ActivityPub::Activity::EmojiReact
       end
     end
   end

app/lib/activitypub/activity/emoji_react.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class ActivityPub::Activity::EmojiReact < ActivityPub::Activity
+  def perform
+    original_status = status_from_uri(object_uri)
+    shortcode       = @json['content']
+
+    return if original_status.nil? || !original_status.account.local? || delete_arrived_first?(@json['id']) || @account.reacted?(original_status, shortcode)
+
+    reaction = original_status.emoji_reactions.create!(account: @account, name: shortcode, uri: @json['id'])
+
+    NotifyService.new.call(original_status.account, :emoji_reaction, reaction) if original_status.account.local?
+  end
+end

app/lib/activitypub/activity/like.rb

@@ -2,11 +2,62 @@
 
 class ActivityPub::Activity::Like < ActivityPub::Activity
   def perform
-    original_status = status_from_uri(object_uri)
+    @original_status = status_from_uri(object_uri)
 
-    return if original_status.nil? || !original_status.account.local? || delete_arrived_first?(@json['id']) || @account.favourited?(original_status)
+    return if @original_status.nil? || delete_arrived_first?(@json['id'])
 
-    favourite = original_status.favourites.create!(account: @account)
-    NotifyService.new.call(original_status.account, :favourite, favourite)
+    lock_or_fail("like:#{object_uri}") do
+      if shortcode.nil?
+        process_favourite
+      else
+        process_reaction
+      end
+    end
+  end
+
+  private
+
+  def process_favourite
+    return if @account.favourited?(@original_status)
+
+    favourite = @original_status.favourites.create!(account: @account)
+
+    NotifyService.new.call(@original_status.account, :favourite, favourite) if @original_status.account.local?
+  end
+
+  def process_reaction
+    if emoji_tag.present?
+      return if emoji_tag['id'].blank? || emoji_tag['name'].blank? || emoji_tag['icon'].blank? || emoji_tag['icon']['url'].blank?
+
+      image_url = emoji_tag['icon']['url']
+      uri       = emoji_tag['id']
+      domain    = URI.split(uri)[2]
+
+      emoji = CustomEmoji.find_or_create_by!(shortcode: shortcode, domain: domain) do |emoji|
+        emoji.uri              = uri
+        emoji.image_remote_url = image_url
+      end
+    end
+
+    return if @account.reacted?(@original_status, shortcode, emoji)
+
+    EmojiReaction.find_by(account: @account, status: @original_status)&.destroy! 
+    reaction = @original_status.emoji_reactions.create!(account: @account, name: shortcode, custom_emoji: emoji, uri: @json['id'])
+
+    NotifyService.new.call(@original_status.account, :emoji_reaction, reaction) if @original_status.account.local?
+  rescue Seahorse::Client::NetworkingError
+    nil
+  end
+
+  def shortcode
+    return @shortcode if defined?(@shortcode)
+
+    @shortcode = @json['_misskey_reaction']&.delete(':')
+  end
+
+  def emoji_tag
+    return @emoji_tag if defined?(@emoji_tag)
+
+    @emoji_tag = @json['tag'].is_a?(Array) ? @json['tag']&.first : @json['tag']
   end
 end

app/lib/activitypub/activity/undo.rb

@@ -1,3 +1,4 @@
+
 # frozen_string_literal: true
 
 class ActivityPub::Activity::Undo < ActivityPub::Activity
@@ -13,6 +14,8 @@ class ActivityPub::Activity::Undo < ActivityPub::Activity
       undo_like
     when 'Block'
       undo_block
+    when 'EmojiReact'
+      undo_react
     when nil
       handle_reference
     end
@@ -25,7 +28,7 @@ class ActivityPub::Activity::Undo < ActivityPub::Activity
     # global index, we have to guess what object it is.
     return if object_uri.nil?
 
-    try_undo_announce || try_undo_accept || try_undo_follow || try_undo_like || try_undo_block || delete_later!(object_uri)
+    try_undo_announce || try_undo_accept || try_undo_follow || try_undo_like || try_undo_react || try_undo_block || delete_later!(object_uri)
   end
 
   def try_undo_announce
@@ -59,6 +62,10 @@ class ActivityPub::Activity::Undo < ActivityPub::Activity
     false
   end
 
+  def try_undo_react
+    @account.emoji_reactions.find_by(uri: object_uri)&.destroy
+  end
+
   def try_undo_block
     block = @account.block_relationships.find_by(uri: object_uri)
     if block.present?
@@ -105,14 +112,33 @@ class ActivityPub::Activity::Undo < ActivityPub::Activity
 
     return if status.nil? || !status.account.local?
 
-    if @account.favourited?(status)
-      favourite = status.favourites.where(account: @account).first
-      favourite&.destroy
+    shortcode = @object['_misskey_reaction']&.delete(':')
+
+    if shortcode.present?
+      emoji_tag = @object['tag'].is_a?(Array) ? @object['tag']&.first : @object['tag']
+
+      if emoji_tag.present? && emoji_tag['id'].present?
+        emoji = CustomEmoji.find_by(shortcode: shortcode, domain: @account.domain)
+      end
+
+      if @account.reacted?(status, shortcode, emoji)
+        status.emoji_reactions.where(account: @account, name: shortcode, custom_emoji: emoji).first&.destroy
+      else
+        delete_later!(object_uri)
+      end
     else
-      delete_later!(object_uri)
+      if @account.favourited?(status)
+        status.favourites.where(account: @account).first&.destroy
+      else
+        delete_later!(object_uri)
+      end
     end
   end
 
+  def undo_react
+    @account.emoji_reactions.find_by(uri: object_uri)&.destroy
+  end
+
   def undo_block
     target_account = account_from_uri(target_uri)
 

app/lib/inline_renderer.rb

@@ -19,6 +19,8 @@ class InlineRenderer
       serializer = REST::AnnouncementSerializer
     when :reaction
       serializer = REST::ReactionSerializer
+    when :emoji_reaction
+      serializer = REST::EmojiReactionSerializer
     when :encrypted_message
       serializer = REST::EncryptedMessageSerializer
     else

app/lib/potential_friendship_tracker.rb

@@ -6,6 +6,7 @@ class PotentialFriendshipTracker
 
   WEIGHTS = {
     reply: 1,
+    emoji_reaction: 1,
     favourite: 10,
     reblog: 20,
   }.freeze

app/lib/user_settings_decorator.rb

@@ -51,6 +51,7 @@ class UserSettingsDecorator
     user.settings['place_tab_bar_at_bottom']           = place_tab_bar_at_bottom_preference if change?('setting_place_tab_bar_at_bottom')
     user.settings['show_tab_bar_label']                = show_tab_bar_label_preference if change?('setting_show_tab_bar_label')
     user.settings['enable_limited_timeline']           = enable_limited_timeline_preference if change?('setting_enable_limited_timeline')
+    user.settings['enable_reaction']                   = enable_reaction_preference if change?('setting_enable_reaction')
   end
 
   def merged_notification_emails
@@ -197,6 +198,10 @@ class UserSettingsDecorator
     boolean_cast_setting 'setting_enable_limited_timeline'
   end
 
+  def enable_reaction_preference
+    boolean_cast_setting 'setting_enable_reaction'
+  end
+
   def boolean_cast_setting(key)
     ActiveModel::Type::Boolean.new.cast(settings[key])
   end

app/mailers/notification_mailer.rb

@@ -66,6 +66,20 @@ class NotificationMailer < ApplicationMailer
     end
   end
 
+  def emoji_reaction(recipient, notification)
+    @me             = recipient
+    @account        = notification.from_account
+    @status         = notification.target_status
+    @emoji_reaction = notification.emoji_reaction
+
+    return unless @me.user.functional? && @status.present?
+
+    locale_for_account(@me) do
+      thread_by_conversation(@status.conversation)
+      mail to: @me.user.email, subject: I18n.t('notification_mailer.emoji_reaction.subject', name: @account.acct)
+    end
+  end
+
   def digest(recipient, **opts)
     return unless recipient.user.functional?
 

app/models/concerns/account_associations.rb

@@ -15,6 +15,7 @@ module AccountAssociations
     has_many :statuses, inverse_of: :account, dependent: :destroy
     has_many :favourites, inverse_of: :account, dependent: :destroy
     has_many :bookmarks, inverse_of: :account, dependent: :destroy
+    has_many :emoji_reactions, inverse_of: :account, dependent: :destroy
     has_many :mentions, inverse_of: :account, dependent: :destroy
     has_many :notifications, inverse_of: :account, dependent: :destroy
     has_many :conversations, class_name: 'AccountConversation', dependent: :destroy, inverse_of: :account

app/models/concerns/account_interactions.rb

@@ -275,6 +275,14 @@ module AccountInteractions
     status.proper.favourites.where(account: self).exists?
   end
 
+  def reacted?(status, name, custom_emoji = nil)
+    status.proper.emoji_reactions.where(account: self, name: name, custom_emoji: custom_emoji).exists?
+  end
+
+  def emoji_reactioned?(status)
+    status.proper.emoji_reactions.where(account: self).exists?
+  end
+
   def bookmarked?(status)
     status.proper.bookmarks.where(account: self).exists?
   end

app/models/emoji_reaction.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: emoji_reactions
+#
+#  id              :bigint(8)        not null, primary key
+#  account_id      :bigint(8)        not null
+#  status_id       :bigint(8)        not null
+#  name            :string           default(""), not null
+#  custom_emoji_id :bigint(8)
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#  uri             :string
+#
+
+class EmojiReaction < ApplicationRecord
+  include Paginable
+
+  after_commit :queue_publish
+
+  belongs_to :account
+  belongs_to :status, inverse_of: :emoji_reactions 
+  belongs_to :custom_emoji, optional: true
+
+  has_one :notification, as: :activity, dependent: :destroy
+
+  validates :name, presence: true
+  validates_with EmojiReactionValidator
+
+  before_validation do
+    self.status = status.reblog if status&.reblog?
+  end
+
+  private
+
+  def queue_publish
+    PublishEmojiReactionWorker.perform_async(status_id, name, custom_emoji_id) unless status.destroyed?
+  end
+end

app/models/notification.rb

@@ -25,6 +25,7 @@ class Notification < ApplicationRecord
     'FollowRequest' => :follow_request,
     'Favourite'     => :favourite,
     'Poll'          => :poll,
+    'EmojiReaction' => :emoji_reaction,
   }.freeze
 
   TYPES = %i(
@@ -35,6 +36,7 @@ class Notification < ApplicationRecord
     follow_request
     favourite
     poll
+    emoji_reaction
   ).freeze
 
   TARGET_STATUS_INCLUDES_BY_TYPE = {
@@ -43,6 +45,7 @@ class Notification < ApplicationRecord
     mention: [mention: :status],
     favourite: [favourite: :status],
     poll: [poll: :status],
+    emoji_reaction: [emoji_reaction: :status],
   }.freeze
 
   belongs_to :account, optional: true
@@ -55,6 +58,7 @@ class Notification < ApplicationRecord
   belongs_to :follow_request, foreign_key: 'activity_id', optional: true
   belongs_to :favourite,      foreign_key: 'activity_id', optional: true
   belongs_to :poll,           foreign_key: 'activity_id', optional: true
+  belongs_to :emoji_reaction, foreign_key: 'activity_id', optional: true
 
   validates :type, inclusion: { in: TYPES }
   validates :activity_id, uniqueness: { scope: [:account_id, :type] }, if: -> { type.to_sym == :status }
@@ -87,9 +91,15 @@ class Notification < ApplicationRecord
       mention&.status
     when :poll
       poll&.status
+    when :emoji_reaction
+      emoji_reaction&.status
     end
   end
 
+  def reblog_visibility
+    type == :reblog ? status.visibility : :public
+  end
+
   class << self
     def preload_cache_collection_target_statuses(notifications, &_block)
       notifications.group_by(&:type).each do |type, grouped_notifications|
@@ -121,6 +131,8 @@ class Notification < ApplicationRecord
           notification.mention.status = cached_status
         when :poll
           notification.poll.status = cached_status
+        when :emoji_reaction
+          notification.emoji_reaction.status = cached_status
         end
       end
 
@@ -137,7 +149,7 @@ class Notification < ApplicationRecord
     return unless new_record?
 
     case activity_type
-    when 'Status', 'Follow', 'Favourite', 'FollowRequest', 'Poll'
+    when 'Status', 'Follow', 'Favourite', 'FollowRequest', 'Poll', 'EmojiReaction'
       self.from_account_id = activity&.account_id
     when 'Mention'
       self.from_account_id = activity&.status&.account_id

app/models/status.rb

@@ -69,6 +69,7 @@ class Status < ApplicationRecord
 
   has_many :favourites, inverse_of: :status, dependent: :destroy
   has_many :bookmarks, inverse_of: :status, dependent: :destroy
+  has_many :emoji_reactions, inverse_of: :status, dependent: :destroy
   has_many :reblogs, foreign_key: 'reblog_of_id', class_name: 'Status', inverse_of: :reblog, dependent: :destroy
   has_many :replies, foreign_key: 'in_reply_to_id', class_name: 'Status', inverse_of: :thread
   has_many :mentions, dependent: :destroy, inverse_of: :status
@@ -124,6 +125,12 @@ class Status < ApplicationRecord
             WHERE f.status_id = statuses.id
             AND f.account_id = :account_id
           )
+          AND NOT EXISTS (
+            SELECT *
+            FROM emoji_reactions r
+            WHERE r.status_id = statuses.id
+            AND r.account_id = :account_id
+          )
           AND statuses.expires_at IS NOT NULL
           AND statuses.expires_at < :current_utc
         )
@@ -190,11 +197,13 @@ class Status < ApplicationRecord
       ids += favourites.where(account: Account.local).pluck(:account_id)
       ids += reblogs.where(account: Account.local).pluck(:account_id)
       ids += bookmarks.where(account: Account.local).pluck(:account_id)
+      ids += emoji_reactions.where(account: Account.local).pluck(:account_id)
     else
       ids += preloaded.mentions[id] || []
       ids += preloaded.favourites[id] || []
       ids += preloaded.reblogs[id] || []
       ids += preloaded.bookmarks[id] || []
+      ids += preloaded.emoji_reactions[id] || []
     end
 
     ids.uniq
@@ -311,6 +320,19 @@ class Status < ApplicationRecord
     status_stat&.favourites_count || 0
   end
 
+  def grouped_reactions(account = nil)
+    records = begin
+      scope = emoji_reactions.group(:status_id, :name, :custom_emoji_id).order(Arel.sql('MIN(created_at) ASC'))
+      if account.nil?
+        scope.select('name, custom_emoji_id, count(*) as count, false as me')
+      else
+        scope.select("name, custom_emoji_id, count(*) as count, exists(select 1 from emoji_reactions r where r.account_id = #{account.id} and r.status_id = emoji_reactions.status_id and r.name = emoji_reactions.name) as me")
+      end
+    end
+    ActiveRecord::Associations::Preloader.new.preload(records, :custom_emoji)
+    records
+  end
+
   def increment_count!(key)
     update_status_stat!(key => public_send(key) + 1)
   end
@@ -349,6 +371,10 @@ class Status < ApplicationRecord
       Bookmark.select('status_id').where(status_id: status_ids).where(account_id: account_id).map { |f| [f.status_id, true] }.to_h
     end
 
+    def emoji_reactions_map(status_ids, account_id)
+      EmojiReaction.select('status_id').where(status_id: status_ids).where(account_id: account_id).map { |f| [f.status_id, true] }.to_h
+    end
+
     def reblogs_map(status_ids, account_id)
       unscoped.select('reblog_of_id').where(reblog_of_id: status_ids).where(account_id: account_id).each_with_object({}) { |s, h| h[s.reblog_of_id] = true }
     end

app/models/user.rb

@@ -129,7 +129,7 @@ class User < ApplicationRecord
            :show_follow_button_on_timeline, :show_subscribe_button_on_timeline, :show_target,
            :show_follow_button_on_timeline, :show_subscribe_button_on_timeline, :show_followed_by, :show_target,
            :follow_button_to_list_adder, :show_navigation_panel, :show_quote_button, :show_bookmark_button,
-           :place_tab_bar_at_bottom,:show_tab_bar_label, :enable_limited_timeline,
+           :place_tab_bar_at_bottom,:show_tab_bar_label, :enable_limited_timeline, :enable_reaction,
 
            to: :settings, prefix: :setting, allow_nil: false
 

app/presenters/status_relationships_presenter.rb

@@ -2,26 +2,28 @@
 
 class StatusRelationshipsPresenter
   attr_reader :reblogs_map, :favourites_map, :mutes_map, :pins_map,
-              :bookmarks_map
+              :bookmarks_map, :emoji_reactions_map
 
   def initialize(statuses, current_account_id = nil, **options)
     if current_account_id.nil?
-      @reblogs_map    = {}
-      @favourites_map = {}
-      @bookmarks_map  = {}
-      @mutes_map      = {}
-      @pins_map       = {}
+      @reblogs_map         = {}
+      @favourites_map      = {}
+      @bookmarks_map       = {}
+      @emoji_reactions_map = {}
+      @mutes_map           = {}
+      @pins_map            = {}
     else
       statuses            = statuses.compact
       status_ids          = statuses.flat_map { |s| [s.id, s.reblog_of_id] }.uniq.compact
       conversation_ids    = statuses.filter_map(&:conversation_id).uniq
       pinnable_status_ids = statuses.map(&:proper).filter_map { |s| s.id if s.account_id == current_account_id && %w(public unlisted).include?(s.visibility) }
 
-      @reblogs_map     = Status.reblogs_map(status_ids, current_account_id).merge(options[:reblogs_map] || {})
-      @favourites_map  = Status.favourites_map(status_ids, current_account_id).merge(options[:favourites_map] || {})
-      @bookmarks_map   = Status.bookmarks_map(status_ids, current_account_id).merge(options[:bookmarks_map] || {})
-      @mutes_map       = Status.mutes_map(conversation_ids, current_account_id).merge(options[:mutes_map] || {})
-      @pins_map        = Status.pins_map(pinnable_status_ids, current_account_id).merge(options[:pins_map] || {})
+      @reblogs_map         = Status.reblogs_map(status_ids, current_account_id).merge(options[:reblogs_map] || {})
+      @favourites_map      = Status.favourites_map(status_ids, current_account_id).merge(options[:favourites_map] || {})
+      @bookmarks_map       = Status.bookmarks_map(status_ids, current_account_id).merge(options[:bookmarks_map] || {})
+      @emoji_reactions_map = Status.emoji_reactions_map(status_ids, current_account_id).merge(options[:emoji_reactions_map] || {})
+      @mutes_map           = Status.mutes_map(conversation_ids, current_account_id).merge(options[:mutes_map] || {})
+      @pins_map            = Status.pins_map(pinnable_status_ids, current_account_id).merge(options[:pins_map] || {})
     end
   end
 end

app/serializers/activitypub/emoji_reaction_serializer.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class ActivityPub::EmojiReactionSerializer < ActivityPub::Serializer
+  attributes :id, :type, :actor, :content
+  attribute :virtual_object, key: :object
+  attribute :misskey_reaction, key: :_misskey_reaction
+
+  has_one :custom_emoji ,key: :tag, serializer: ActivityPub::EmojiSerializer, unless: -> { object.custom_emoji.nil? }
+
+  def id
+    [ActivityPub::TagManager.instance.uri_for(object.account), '#emoji_reactions/', object.id].join
+  end
+
+  def type
+    'Like'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def virtual_object
+    ActivityPub::TagManager.instance.uri_for(object.status)
+  end
+
+  def content
+    object.custom_emoji.nil? ? object.name : ":#{object.name}:"
+  end
+
+  def misskey_reaction
+    object.custom_emoji.nil? ? object.name : ":#{object.name}:"
+  end
+end

app/serializers/activitypub/undo_emoji_reaction_serializer.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class ActivityPub::UndoEmojiReactionSerializer < ActivityPub::Serializer
+  attributes :id, :type, :actor
+
+  has_one :object, serializer: ActivityPub::EmojiReactionSerializer
+
+  def id
+    [ActivityPub::TagManager.instance.uri_for(object.account), '#emoji_reactions/', object.id, '/undo'].join
+  end
+
+  def type
+    'Undo'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+end

app/serializers/initial_state_serializer.rb

@@ -53,6 +53,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       store[:place_tab_bar_at_bottom]           = object.current_account.user.setting_place_tab_bar_at_bottom
       store[:show_tab_bar_label]                = object.current_account.user.setting_show_tab_bar_label
       store[:enable_limited_timeline]           = object.current_account.user.setting_enable_limited_timeline
+      store[:enable_reaction]                   = object.current_account.user.setting_enable_reaction
     else
       store[:auto_play_gif] = Setting.auto_play_gif
       store[:display_media] = Setting.display_media

app/serializers/rest/emoji_reaction_serializer.rb

@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+class REST::EmojiReactionSerializer < REST::ReactionSerializer
+end

app/serializers/rest/instance_serializer.rb

@@ -118,6 +118,7 @@ class REST::InstanceSerializer < ActiveModel::Serializer
       :timeline_group_directory,
       :visibility_mutual,
       :visibility_limited,
+      :emoji_reaction,
     ]
   end
 

app/serializers/rest/notification_serializer.rb

@@ -5,12 +5,30 @@ class REST::NotificationSerializer < ActiveModel::Serializer
 
   belongs_to :from_account, key: :account, serializer: REST::AccountSerializer
   belongs_to :target_status, key: :status, if: :status_type?, serializer: REST::StatusSerializer
+  belongs_to :emoji_reaction, if: :emoji_reaction?
+  attribute :reblog_visibility, if: :reblog?
 
   def id
     object.id.to_s
   end
 
   def status_type?
-    [:favourite, :reblog, :status, :mention, :poll].include?(object.type)
+    [:favourite, :reblog, :status, :mention, :poll, :emoji_reaction].include?(object.type)
+  end
+
+  def reblog?
+    object.type == :reblog
+  end
+
+  def emoji_reaction?
+    object.type == :emoji_reaction
+  end
+
+  class EmojiReactionSerializer < REST::EmojiReactionSerializer
+    attributes :me
+
+    def me
+       false
+    end
   end
 end

app/serializers/rest/reaction_serializer.rb

@@ -8,6 +8,7 @@ class REST::ReactionSerializer < ActiveModel::Serializer
   attribute :me, if: :current_user?
   attribute :url, if: :custom_emoji?
   attribute :static_url, if: :custom_emoji?
+  attribute :domain, if: :custom_emoji?
 
   def count
     object.respond_to?(:count) ? object.count : 0
@@ -28,4 +29,8 @@ class REST::ReactionSerializer < ActiveModel::Serializer
   def static_url
     full_asset_url(object.custom_emoji.image.url(:static))
   end
+
+  def domain
+    object.custom_emoji.domain
+  end
 end

app/serializers/rest/status_serializer.rb

@@ -10,6 +10,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   attribute :reblogged, if: :current_user?
   attribute :muted, if: :current_user?
   attribute :bookmarked, if: :current_user?
+  attribute :emoji_reactioned, if: :current_user?
   attribute :pinned, if: :pinnable?
   attribute :circle_id, if: :limited_owned_parent_status?
 
@@ -29,6 +30,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   has_many :ordered_mentions, key: :mentions
   has_many :tags
   has_many :emojis, serializer: REST::CustomEmojiSerializer
+  has_many :emoji_reactions, serializer: REST::EmojiReactionSerializer
 
   has_one :preview_card, key: :card, serializer: REST::PreviewCardSerializer
   has_one :preloadable_poll, key: :poll, serializer: REST::PollSerializer
@@ -124,6 +126,10 @@ class REST::StatusSerializer < ActiveModel::Serializer
     end
   end
 
+  def emoji_reactions
+    object.grouped_reactions(current_user&.account)
+  end
+
   def reblogged
     if instance_options && instance_options[:relationships]
       instance_options[:relationships].reblogs_map[object.id] || false
@@ -148,6 +154,14 @@ class REST::StatusSerializer < ActiveModel::Serializer
     end
   end
 
+  def emoji_reactioned
+    if instance_options && instance_options[:relationships]
+      instance_options[:relationships].emoji_reactions_map[object.id] || false
+    else
+      current_user.account.emoji_reactioned?(object)
+    end
+  end
+
   def pinned
     if instance_options && instance_options[:relationships]
       instance_options[:relationships].pins_map[object.id] || false

app/services/delete_account_service.rb

@@ -150,6 +150,7 @@ class DeleteAccountService < BaseService
     purge_generated_notifications!
     purge_favourites!
     purge_bookmarks!
+    purge_reactions!
     purge_feeds!
     purge_other_associations!
 
@@ -202,6 +203,13 @@ class DeleteAccountService < BaseService
     end
   end
 
+  def purge_reactions!
+    @account.emoji_reactions.in_batches do |reactions|
+      Chewy.strategy.current.update(StatusesIndex::Status, reactions.pluck(:status_id)) if Chewy.enabled?
+      reactions.delete_all
+    end
+  end
+
   def purge_other_associations!
     associations_for_destruction.each do |association_name|
       purge_association(association_name)

app/services/emoji_reaction_service.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class EmojiReactionService < BaseService
+  include Authorization
+  include Payloadable
+
+  def call(account, status, emoji)
+    emoji_reaction = EmojiReaction.find_by(account_id: account.id, status_id: status.id)
+
+    return emoji_reaction unless emoji_reaction.nil?
+
+    shortcode, domain = emoji.split("@")
+
+    custom_emoji = CustomEmoji.find_by(shortcode: shortcode, domain: domain)
+
+    emoji_reaction = EmojiReaction.create!(account: account, status: status, name: shortcode, custom_emoji: custom_emoji)
+
+    create_notification(emoji_reaction)
+    bump_potential_friendship(account, status)
+
+    emoji_reaction
+  end
+
+  private 
+
+  def create_notification(emoji_reaction)
+    status = emoji_reaction.status
+
+    if status.account.local?
+      NotifyService.new.call(status.account, :emoji_reaction, emoji_reaction)
+    elsif status.account.activitypub?
+      ActivityPub::DeliveryWorker.perform_async(build_json(emoji_reaction), emoji_reaction.account_id, status.account.inbox_url)
+    end
+  end
+
+  def bump_potential_friendship(account, status)
+    ActivityTracker.increment('activity:interactions')
+    return if account.following?(status.account_id)
+    PotentialFriendshipTracker.record(account.id, status.account_id, :emoji_reaction)
+  end
+
+  def build_json(emoji_reaction)
+    Oj.dump(serialize_payload(emoji_reaction, ActivityPub::EmojiReactionSerializer))
+  end
+end

app/services/notify_service.rb

@@ -46,6 +46,10 @@ class NotifyService < BaseService
     false
   end
 
+  def blocked_emoji_reaction?
+    false
+  end
+
   def following_sender?
     return @following_sender if defined?(@following_sender)
     @following_sender = @recipient.following?(@notification.from_account) || @recipient.requested?(@notification.from_account)

app/services/un_emoji_reaction_service.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class UnEmojiReactionService < BaseService
+  include Payloadable
+
+  def call(account, status)
+    emoji_reaction = EmojiReaction.find_by!(account: account, status: status)
+
+    emoji_reaction.destroy!
+    create_notification(emoji_reaction)
+    emoji_reaction
+  end
+
+  private
+
+  def create_notification(emoji_reaction)
+    status = emoji_reaction.status
+
+    if !status.account.local? && status.account.activitypub?
+      ActivityPub::DeliveryWorker.perform_async(build_json(emoji_reaction), emoji_reaction.account_id, status.account.inbox_url)
+    end
+  end
+
+  def build_json(emoji_reaction)
+    Oj.dump(serialize_payload(emoji_reaction, ActivityPub::UndoEmojiReactionSerializer))
+  end
+end

app/validators/emoji_reaction_validator.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class EmojiReactionValidator < ActiveModel::Validator
+  SUPPORTED_EMOJIS = Oj.load(File.read(Rails.root.join('app', 'javascript', 'mastodon', 'features', 'emoji', 'emoji_map.json'))).keys.freeze
+  LIMIT = 8
+
+  def validate(reaction)
+    return if reaction.name.blank?
+
+    reaction.errors.add(:name, I18n.t('reactions.errors.unrecognized_emoji')) if reaction.custom_emoji_id.blank? && !unicode_emoji?(reaction.name)
+    reaction.errors.add(:base, I18n.t('reactions.errors.limit_reached')) if new_reaction?(reaction) && limit_reached?(reaction)
+
+  end
+
+  private
+
+  def unicode_emoji?(name)
+    SUPPORTED_EMOJIS.include?(name)
+  end
+
+  def new_reaction?(reaction)
+    !reaction.status.emoji_reactions.where(name: reaction.name).exists?
+  end
+
+  def limit_reached?(reaction)
+    reaction.status.emoji_reactions.where.not(name: reaction.name).count('distinct name') >= LIMIT
+  end
+end

app/views/notification_mailer/emoji_reaction.html.haml

@@ -0,0 +1,45 @@
+%table.email-table{ cellspacing: 0, cellpadding: 0 }
+  %tbody
+    %tr
+      %td.email-body
+        .email-container
+          %table.content-section{ cellspacing: 0, cellpadding: 0 }
+            %tbody
+              %tr
+                %td.content-cell.hero
+                  .email-row
+                    .col-6
+                      %table.column{ cellspacing: 0, cellpadding: 0 }
+                        %tbody
+                          %tr
+                            %td.column-cell.text-center.padded
+                              %table.hero-icon{ align: 'center', cellspacing: 0, cellpadding: 0 }
+                                %tbody
+                                  %tr
+                                    %td
+                                      = image_tag full_pack_url('media/images/mailer/icon_grade.png'), alt:''
+
+                              %h1= t 'notification_mailer.emoji_reaction.title'
+                              %p.lead= t('notification_mailer.emoji_reaction.body', name: @account.acct)
+
+= render 'status', status: @status
+
+%table.email-table{ cellspacing: 0, cellpadding: 0 }
+  %tbody
+    %tr
+      %td.email-body
+        .email-container
+          %table.content-section{ cellspacing: 0, cellpadding: 0 }
+            %tbody
+              %tr
+                %td.content-cell.content-start.border-top
+                  %table.column{ cellspacing: 0, cellpadding: 0 }
+                    %tbody
+                      %tr
+                        %td.column-cell.button-cell
+                          %table.button{ align: 'center', cellspacing: 0, cellpadding: 0 }
+                            %tbody
+                              %tr
+                                %td.button-primary
+                                  = link_to web_url("statuses/#{@status.id}") do
+                                    %span= t 'application_mailer.view_status'

app/views/notification_mailer/emoji_reaction.text.erb

@@ -0,0 +1,5 @@
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
+
+<%= raw t('notification_mailer.emoji_reaction.body', name: @account.acct) %>
+
+<%= render 'status', status: @status %>

app/views/settings/preferences/notifications/show.html.haml

@@ -17,6 +17,7 @@
       = ff.input :follow_request, as: :boolean, wrapper: :with_label
       = ff.input :reblog, as: :boolean, wrapper: :with_label
       = ff.input :favourite, as: :boolean, wrapper: :with_label
+      = ff.input :emoji_reaction, as: :boolean, wrapper: :with_label
       = ff.input :mention, as: :boolean, wrapper: :with_label
 
       - if current_user.staff?

app/views/settings/preferences/other/show.html.haml

@@ -63,6 +63,9 @@
   .fields-group
     = f.input :setting_enable_limited_timeline, as: :boolean, wrapper: :with_label
 
+  .fields-group
+    = f.input :setting_enable_reaction, as: :boolean, wrapper: :with_label
+
   -# .fields-group
   -#   = f.input :setting_show_target, as: :boolean, wrapper: :with_label
 

app/workers/publish_emoji_reaction_worker.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class PublishEmojiReactionWorker
+  include Sidekiq::Worker
+  include Redisable
+  include RoutingHelper
+
+  def perform(status_id, name, custom_emoji_id)
+    status       = Status.find(status_id)
+    custom_emoji = CustomEmoji.find(custom_emoji_id) if custom_emoji_id.present?
+
+    emoji_reaction,  = status.emoji_reactions.where(name: name, custom_emoji_id: custom_emoji_id).group(:status_id, :name, :custom_emoji_id).select('name, custom_emoji_id, count(*) as count, false as me')
+    emoji_reaction ||= status.emoji_reactions.new(name: name, custom_emoji_id: custom_emoji_id)
+
+    payload = InlineRenderer.render(emoji_reaction, nil, :emoji_reaction).tap { |h|
+      h[:status_id] = status_id.to_s
+      if custom_emoji.present?
+        h[:url]        = full_asset_url(custom_emoji.image.url)
+        h[:static_url] = full_asset_url(custom_emoji.image.url(:static))
+        h[:domain]     = custom_emoji.domain
+      end
+    }
+    payload = Oj.dump(event: :'emoji_reaction', payload: payload)
+
+    FeedManager.instance.with_active_accounts do |account|
+      redis.publish("timeline:#{account.id}", payload) if redis.exists?("subscribed:timeline:#{account.id}")
+    end
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end

app/workers/un_emoji_reaction_worker.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class UnEmojiReactionWorker
+  include Sidekiq::Worker
+
+  def perform(account_id, status_id)
+    UnEmojiReactionService.new.call(Account.find(account_id), Status.find(status_id))
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end

config/locales/en.yml

@@ -1155,6 +1155,10 @@ en:
         one: "1 new notification since your last visit \U0001F418"
         other: "%{count} new notifications since your last visit \U0001F418"
       title: In your absence...
+    emoji_reaction:
+      body: 'Your post was emoji reactioned by %{name}:'
+      subject: "%{name} emoji reactioned your post"
+      title: New emoji reaction
     favourite:
       body: 'Your post was favourited by %{name}:'
       subject: "%{name} favourited your post"

config/locales/ja.yml

@@ -1101,6 +1101,10 @@ ja:
       subject:
         other: "新しい%{count}件の通知 \U0001F418"
       title: 不在の間に…
+    emoji_reaction:
+      body: "%{name} さんに絵文字リアクションされた、あなたの投稿があります:"
+      subject: "%{name} さんに絵文字リアクションされました"
+      title: 新たな絵文字リアクション
     favourite:
       body: "%{name} さんにお気に入り登録された、あなたの投稿があります:"
       subject: "%{name} さんにお気に入りに登録されました"

config/locales/simple_form.en.yml

@@ -52,6 +52,7 @@ en:
         setting_display_media_hide_all: Always hide media
         setting_display_media_show_all: Always show media
         setting_enable_limited_timeline: Enable a limited home to display private and circle and direct message
+        setting_enable_reaction: Enable the reaction display on the timeline and display the reaction button
         setting_follow_button_to_list_adder: Change the behavior of the Follow / Subscribe button, open a dialog where you can select a list to follow / subscribe, or opt out of receiving at home
         setting_hide_network: Who you follow and who follows you will be hidden on your profile
         setting_noindex: Affects your public profile and post pages
@@ -188,6 +189,7 @@ en:
         setting_display_media_hide_all: Hide all
         setting_display_media_show_all: Show all
         setting_enable_limited_timeline: Enable limited timeline
+        setting_enable_reaction: Enable reaction
         setting_expand_spoilers: Always expand posts marked with content warnings
         setting_follow_button_to_list_adder: Open list add dialog with follow button
         setting_hide_network: Hide your social graph
@@ -275,11 +277,13 @@ en:
         timeline: Timeline
       notification_emails:
         digest: Send digest e-mails
+        emoji_reaction: Someone emoji reactioned you
         favourite: Someone favourited your post
         follow: Someone followed you
         follow_request: Someone requested to follow you
         mention: Someone mentioned you
         pending_account: New account needs review
+        reaction: Someone reactioned your post
         reblog: Someone boosted your post
         report: New report is submitted
         trending_tag: An unreviewed hashtag is trending

config/locales/simple_form.ja.yml

@@ -52,6 +52,7 @@ ja:
         setting_display_media_hide_all: メディアを常に隠す
         setting_display_media_show_all: メディアを常に表示する
         setting_enable_limited_timeline: フォロワー限定・サークル・ダイレクトメッセージを表示する限定ホームを有効にします
+        setting_enable_reaction: タイムラインでリアクションの表示を有効にし、リアクションボタンを表示する
         setting_follow_button_to_list_adder: フォロー・購読ボタンの動作を変更し、フォロー・購読するリストを選択したり、ホームで受け取らないよう設定するダイアログを開きます
         setting_hide_network: フォローとフォロワーの情報がプロフィールページで見られないようにします
         setting_noindex: 公開プロフィールおよび各投稿ページに影響します
@@ -188,6 +189,7 @@ ja:
         setting_display_media_hide_all: 非表示
         setting_display_media_show_all: 表示
         setting_enable_limited_timeline: 限定ホームを有効にする
+        setting_enable_reaction: リアクションを有効にする
         setting_expand_spoilers: 閲覧注意としてマークされた投稿を常に展開する
         setting_follow_button_to_list_adder: フォローボタンでリスト追加ダイアログを開く
         setting_hide_network: 繋がりを隠す
@@ -279,11 +281,13 @@ ja:
         timeline: タイムライン
       notification_emails:
         digest: タイムラインからピックアップしてメールで通知する
+        emoji_reaction: 絵文字リアクションされた時
         favourite: お気に入り登録された時
         follow: フォローされた時
         follow_request: フォローリクエストを受けた時
         mention: 返信が来た時
         pending_account: 新しいアカウントの承認が必要な時
+        reaction: リアクションされた時
         reblog: 投稿がブーストされた時
         report: 通報を受けた時
         trending_tag: 未審査のハッシュタグが人気の時

config/routes.rb

@@ -333,6 +333,7 @@ Rails.application.routes.draw do
         scope module: :statuses do
           resources :reblogged_by, controller: :reblogged_by_accounts, only: :index
           resources :favourited_by, controller: :favourited_by_accounts, only: :index
+          resources :emoji_reactioned_by, controller: :emoji_reactioned_by_accounts, only: :index
           resources :mentioned_by, controller: :mentioned_by_accounts, only: :index
           resource :reblog, only: :create
           post :unreblog, to: 'reblogs#destroy'
@@ -348,6 +349,9 @@ Rails.application.routes.draw do
 
           resource :pin, only: :create
           post :unpin, to: 'pins#destroy'
+
+          resources :emoji_reactions, only: :update, constraints: { id: /[^\/]+/ }
+          post :emoji_unreaction, to: 'emoji_reactions#destroy'
         end
 
         member do
@@ -402,16 +406,17 @@ Rails.application.routes.draw do
         end
       end
 
-      resources :media,        only: [:create, :update, :show]
-      resources :blocks,       only: [:index]
-      resources :mutes,        only: [:index]
-      resources :favourites,   only: [:index]
-      resources :bookmarks,    only: [:index]
-      resources :reports,      only: [:create]
-      resources :trends,       only: [:index]
-      resources :filters,      only: [:index, :create, :show, :update, :destroy]
-      resources :endorsements, only: [:index]
-      resources :markers,      only: [:index, :create]
+      resources :media,           only: [:create, :update, :show]
+      resources :blocks,          only: [:index]
+      resources :mutes,           only: [:index]
+      resources :favourites,      only: [:index]
+      resources :bookmarks,       only: [:index]
+      resources :emoji_reactions, only: [:index]
+      resources :reports,         only: [:create]
+      resources :trends,          only: [:index]
+      resources :filters,         only: [:index, :create, :show, :update, :destroy]
+      resources :endorsements,    only: [:index]
+      resources :markers,         only: [:index, :create]
 
       namespace :apps do
         get :verify_credentials, to: 'credentials#show'

config/settings.yml

@@ -50,10 +50,12 @@ defaults: &defaults
   place_tab_bar_at_bottom: false
   show_tab_bar_label: false
   enable_limited_timeline: false
+  enable_reaction: true
   notification_emails:
     follow: false
     reblog: false
     favourite: false
+    emoji_reaction: false
     mention: false
     follow_request: true
     digest: true

db/migrate/20200318135004_create_emoji_reactions.rb

@@ -0,0 +1,16 @@
+class CreateEmojiReactions < ActiveRecord::Migration[5.2]
+  def change
+    create_table :emoji_reactions do |t|
+      t.belongs_to :account, foreign_key: { on_delete: :cascade, index: false }
+      t.belongs_to :status, foreign_key: { on_delete: :cascade }
+
+      t.string :name, null: false, default: ''
+      t.belongs_to :custom_emoji, foreign_key: { on_delete: :cascade }
+
+      t.timestamps
+    end
+
+    add_index :emoji_reactions, [:account_id, :status_id, :name], unique: true, name: :index_emoji_reactions_on_account_id_and_status_id
+  end
+end
+

db/migrate/20210514223437_add_uri_to_emoji_reaction.rb

@@ -0,0 +1,5 @@
+class AddUriToEmojiReaction < ActiveRecord::Migration[6.1]
+  def change
+    add_column :emoji_reactions, :uri, :string
+  end
+end

db/migrate/20210516033426_change_status_and_account_on_emoji_reaction_to_nonnullable.rb

@@ -0,0 +1,8 @@
+class ChangeStatusAndAccountOnEmojiReactionToNonnullable < ActiveRecord::Migration[6.1]
+  def change
+    safety_assured do
+      change_column_null :emoji_reactions, :account_id, false
+      change_column_null :emoji_reactions, :status_id, false
+    end
+  end
+end

db/schema.rb

@@ -454,6 +454,20 @@ ActiveRecord::Schema.define(version: 2021_08_08_071221) do
     t.index ["domain"], name: "index_email_domain_blocks_on_domain", unique: true
   end
 
+  create_table "emoji_reactions", force: :cascade do |t|
+    t.bigint "account_id", null: false
+    t.bigint "status_id", null: false
+    t.string "name", default: "", null: false
+    t.bigint "custom_emoji_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string "uri"
+    t.index ["account_id", "status_id", "name"], name: "index_emoji_reactions_on_account_id_and_status_id", unique: true
+    t.index ["account_id"], name: "index_emoji_reactions_on_account_id"
+    t.index ["custom_emoji_id"], name: "index_emoji_reactions_on_custom_emoji_id"
+    t.index ["status_id"], name: "index_emoji_reactions_on_status_id"
+      end
+
   create_table "encrypted_messages", id: :bigint, default: -> { "timestamp_id('encrypted_messages'::text)" }, force: :cascade do |t|
     t.bigint "device_id"
     t.bigint "from_account_id"
@@ -1165,6 +1179,9 @@ ActiveRecord::Schema.define(version: 2021_08_08_071221) do
   add_foreign_key "domain_subscribes", "lists", on_delete: :cascade
   add_foreign_key "domains", "accounts", column: "contact_account_id"
   add_foreign_key "email_domain_blocks", "email_domain_blocks", column: "parent_id", on_delete: :cascade
+  add_foreign_key "emoji_reactions", "accounts", on_delete: :cascade
+  add_foreign_key "emoji_reactions", "custom_emojis", on_delete: :cascade
+  add_foreign_key "emoji_reactions", "statuses", on_delete: :cascade
   add_foreign_key "encrypted_messages", "accounts", column: "from_account_id", on_delete: :cascade
   add_foreign_key "encrypted_messages", "devices", on_delete: :cascade
   add_foreign_key "favourite_domains", "accounts", on_delete: :cascade