akkoma/lib/pleroma/web/activity_pub/builder.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.Builder do
@moduledoc """
This module builds the objects. Meant to be used for creating local objects.
This module encodes our addressing policies and general shape of our objects.
"""
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alias Pleroma.Emoji
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alias Pleroma.Object
alias Pleroma.User
alias Pleroma.Web.ActivityPub.Relay
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.CommonAPI.ActivityDraft
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alias Pleroma.Web.Endpoint
require Pleroma.Constants
def accept_or_reject(actor, activity, type) do
data = %{
"id" => Utils.generate_activity_id(),
"actor" => actor.ap_id,
"type" => type,
"object" => activity.data["id"],
"to" => [activity.actor]
}
{:ok, data, []}
end
@spec reject(User.t(), Activity.t()) :: {:ok, map(), keyword()}
def reject(actor, rejected_activity) do
accept_or_reject(actor, rejected_activity, "Reject")
end
@spec accept(User.t(), Activity.t()) :: {:ok, map(), keyword()}
def accept(actor, accepted_activity) do
accept_or_reject(actor, accepted_activity, "Accept")
end
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@spec follow(User.t(), User.t()) :: {:ok, map(), keyword()}
def follow(follower, followed) do
data = %{
"id" => Utils.generate_activity_id(),
"actor" => follower.ap_id,
"type" => "Follow",
"object" => followed.ap_id,
"to" => [followed.ap_id]
}
{:ok, data, []}
end
defp unicode_emoji_react(_object, data, emoji) do
data
|> Map.put("content", emoji)
|> Map.put("type", "EmojiReact")
end
defp add_emoji_content(data, emoji, url) do
data
|> Map.put("content", Emoji.maybe_quote(emoji))
|> Map.put("type", "EmojiReact")
|> Map.put("tag", [
%{}
|> Map.put("id", url)
|> Map.put("type", "Emoji")
|> Map.put("name", Emoji.maybe_quote(emoji))
|> Map.put(
"icon",
%{}
|> Map.put("type", "Image")
|> Map.put("url", url)
)
])
end
defp remote_custom_emoji_react(
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%{data: %{"reactions" => existing_reactions}},
data,
emoji
) do
[emoji_code, instance] = String.split(Emoji.stripped_name(emoji), "@")
matching_reaction =
Enum.find(
existing_reactions,
fn [name, _, url] ->
url = URI.parse(url)
url.host == instance && name == emoji_code
end
)
if matching_reaction do
[name, _, url] = matching_reaction
add_emoji_content(data, name, url)
else
{:error, "Could not react"}
end
end
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defp remote_custom_emoji_react(_object, _data, _emoji) do
{:error, "Could not react"}
end
defp local_custom_emoji_react(data, emoji) do
with %{} = emojo <- Emoji.get(emoji) do
path = emojo |> Map.get(:file)
url = "#{Endpoint.url()}#{path}"
add_emoji_content(data, emojo.code, url)
else
_ -> {:error, "Emoji does not exist"}
end
end
defp custom_emoji_react(object, data, emoji) do
if String.contains?(emoji, "@") do
remote_custom_emoji_react(object, data, emoji)
else
local_custom_emoji_react(data, emoji)
end
end
@spec emoji_react(User.t(), Object.t(), String.t()) :: {:ok, map(), keyword()}
def emoji_react(actor, object, emoji) do
with {:ok, data, meta} <- object_action(actor, object) do
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data =
if Emoji.is_unicode_emoji?(emoji) do
unicode_emoji_react(object, data, emoji)
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else
custom_emoji_react(object, data, emoji)
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end
{:ok, data, meta}
end
end
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@spec undo(User.t(), Activity.t()) :: {:ok, map(), keyword()}
def undo(actor, object) do
{:ok,
%{
"id" => Utils.generate_activity_id(),
"actor" => actor.ap_id,
"type" => "Undo",
"object" => object.data["id"],
"to" => object.data["to"] || [],
"cc" => object.data["cc"] || []
}, []}
end
@spec delete(User.t(), String.t()) :: {:ok, map(), keyword()}
def delete(actor, object_id) do
object = Object.normalize(object_id, fetch: false)
user = !object && User.get_cached_by_ap_id(object_id)
to =
case {object, user} do
{%Object{}, _} ->
# We are deleting an object, address everyone who was originally mentioned
(object.data["to"] || []) ++ (object.data["cc"] || [])
{_, %User{follower_address: follower_address}} ->
# We are deleting a user, address the followers of that user
[follower_address]
end
{:ok,
%{
"id" => Utils.generate_activity_id(),
"actor" => actor.ap_id,
"object" => object_id,
"to" => to,
"type" => "Delete"
}, []}
end
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def create(actor, object, recipients) do
context =
if is_map(object) do
object["context"]
else
nil
end
{:ok,
%{
"id" => Utils.generate_activity_id(),
"actor" => actor.ap_id,
"to" => recipients,
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"object" => object,
"type" => "Create",
"published" => DateTime.utc_now() |> DateTime.to_iso8601()
}
|> Pleroma.Maps.put_if_present("context", context), []}
end
@spec note(ActivityDraft.t()) :: {:ok, map(), keyword()}
def note(%ActivityDraft{} = draft) do
data =
%{
"type" => "Note",
"to" => draft.to,
"cc" => draft.cc,
"content" => draft.content_html,
"summary" => draft.summary,
"sensitive" => draft.sensitive,
"context" => draft.context,
"attachment" => draft.attachments,
"actor" => draft.user.ap_id,
"tag" => Keyword.values(draft.tags) |> Enum.uniq()
}
|> add_in_reply_to(draft.in_reply_to)
|> add_quote(draft.quote)
|> Map.merge(draft.extra)
{:ok, data, []}
end
defp add_in_reply_to(object, nil), do: object
defp add_in_reply_to(object, in_reply_to) do
with %Object{} = in_reply_to_object <- Object.normalize(in_reply_to, fetch: false) do
Map.put(object, "inReplyTo", in_reply_to_object.data["id"])
else
_ -> object
end
end
defp add_quote(object, nil), do: object
defp add_quote(object, quote) do
with %Object{} = quote_object <- Object.normalize(quote, fetch: false) do
Map.put(object, "quoteUri", quote_object.data["id"])
else
_ -> object
end
end
def answer(user, object, name) do
{:ok,
%{
"type" => "Answer",
"actor" => user.ap_id,
"attributedTo" => user.ap_id,
"cc" => [object.data["actor"]],
"to" => [],
"name" => name,
"inReplyTo" => object.data["id"],
"context" => object.data["context"],
"published" => DateTime.utc_now() |> DateTime.to_iso8601(),
"id" => Utils.generate_object_id()
}, []}
end
@spec tombstone(String.t(), String.t()) :: {:ok, map(), keyword()}
def tombstone(actor, id) do
{:ok,
%{
"id" => id,
"actor" => actor,
"type" => "Tombstone"
}, []}
end
@spec like(User.t(), Object.t()) :: {:ok, map(), keyword()}
def like(actor, object) do
with {:ok, data, meta} <- object_action(actor, object) do
data =
data
|> Map.put("type", "Like")
{:ok, data, meta}
end
end
@spec update(User.t(), Object.t()) :: {:ok, map(), keyword()}
def update(actor, object) do
{to, cc} =
if object["type"] in Pleroma.Constants.actor_types() do
# User updates, always public
{[Pleroma.Constants.as_public(), actor.follower_address], []}
else
# Status updates, follow the recipients in the object
{object["to"] || [], object["cc"] || []}
end
{:ok,
%{
"id" => Utils.generate_activity_id(),
"type" => "Update",
"actor" => actor.ap_id,
"object" => object,
"to" => to,
"cc" => cc
}, []}
end
@spec block(User.t(), User.t()) :: {:ok, map(), keyword()}
def block(blocker, blocked) do
{:ok,
%{
"id" => Utils.generate_activity_id(),
"type" => "Block",
"actor" => blocker.ap_id,
"object" => blocked.ap_id,
"to" => [blocked.ap_id]
}, []}
end
@spec announce(User.t(), Object.t(), keyword()) :: {:ok, map(), keyword()}
def announce(actor, object, options \\ []) do
public? = Keyword.get(options, :public, false)
to =
cond do
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actor.ap_id == Relay.ap_id() ->
[actor.follower_address]
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public? and Visibility.is_local_public?(object) ->
[actor.follower_address, object.data["actor"], Utils.as_local_public()]
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public? ->
[actor.follower_address, object.data["actor"], Pleroma.Constants.as_public()]
true ->
[actor.follower_address, object.data["actor"]]
end
{:ok,
%{
"id" => Utils.generate_activity_id(),
"actor" => actor.ap_id,
"object" => object.data["id"],
"to" => to,
"context" => object.data["context"],
"type" => "Announce",
"published" => Utils.make_date()
}, []}
end
@spec object_action(User.t(), Object.t()) :: {:ok, map(), keyword()}
defp object_action(actor, object) do
object_actor = User.get_cached_by_ap_id(object.data["actor"])
# Address the actor of the object, and our actor's follower collection if the post is public.
to =
if Visibility.is_public?(object) do
[actor.follower_address, object.data["actor"]]
else
[object.data["actor"]]
end
# CC everyone who's been addressed in the object, except ourself and the object actor's
# follower collection
cc =
(object.data["to"] ++ (object.data["cc"] || []))
|> List.delete(actor.ap_id)
|> List.delete(object_actor.follower_address)
{:ok,
%{
"id" => Utils.generate_activity_id(),
"actor" => actor.ap_id,
"object" => object.data["id"],
"to" => to,
"cc" => cc,
"context" => object.data["context"]
}, []}
end
@spec pin(User.t(), Object.t()) :: {:ok, map(), keyword()}
def pin(%User{} = user, object) do
{:ok,
%{
"id" => Utils.generate_activity_id(),
"target" => pinned_url(user.nickname),
"object" => object.data["id"],
"actor" => user.ap_id,
"type" => "Add",
"to" => [Pleroma.Constants.as_public()],
"cc" => [user.follower_address]
}, []}
end
@spec unpin(User.t(), Object.t()) :: {:ok, map, keyword()}
def unpin(%User{} = user, object) do
{:ok,
%{
"id" => Utils.generate_activity_id(),
"target" => pinned_url(user.nickname),
"object" => object.data["id"],
"actor" => user.ap_id,
"type" => "Remove",
"to" => [Pleroma.Constants.as_public()],
"cc" => [user.follower_address]
}, []}
end
defp pinned_url(nickname) when is_binary(nickname) do
Pleroma.Web.Router.Helpers.activity_pub_url(Pleroma.Web.Endpoint, :pinned, nickname)
end
end