distraction.party/lib/pleroma/web/activity_pub/utils.ex

812 lines
22 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.Utils do
alias Ecto.Changeset
alias Ecto.UUID
alias Pleroma.Activity
alias Pleroma.Notification
alias Pleroma.Object
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.Endpoint
alias Pleroma.Web.Router.Helpers
import Ecto.Query
require Logger
require Pleroma.Constants
@supported_object_types ["Article", "Note", "Video", "Page", "Question", "Answer"]
@supported_report_states ~w(open closed resolved)
@valid_visibilities ~w(public unlisted private direct)
# Some implementations send the actor URI as the actor field, others send the entire actor object,
# so figure out what the actor's URI is based on what we have.
def get_ap_id(%{"id" => id} = _), do: id
def get_ap_id(id), do: id
def normalize_params(params) do
Map.put(params, "actor", get_ap_id(params["actor"]))
end
def determine_explicit_mentions(%{"tag" => tag} = _object) when is_list(tag) do
tag
|> Enum.filter(fn x -> is_map(x) end)
|> Enum.filter(fn x -> x["type"] == "Mention" end)
|> Enum.map(fn x -> x["href"] end)
end
def determine_explicit_mentions(%{"tag" => tag} = object) when is_map(tag) do
Map.put(object, "tag", [tag])
|> determine_explicit_mentions()
end
def determine_explicit_mentions(_), do: []
defp recipient_in_collection(ap_id, coll) when is_binary(coll), do: ap_id == coll
defp recipient_in_collection(ap_id, coll) when is_list(coll), do: ap_id in coll
defp recipient_in_collection(_, _), do: false
def recipient_in_message(%User{ap_id: ap_id} = recipient, %User{} = actor, params) do
cond do
recipient_in_collection(ap_id, params["to"]) ->
true
recipient_in_collection(ap_id, params["cc"]) ->
true
recipient_in_collection(ap_id, params["bto"]) ->
true
recipient_in_collection(ap_id, params["bcc"]) ->
true
# if the message is unaddressed at all, then assume it is directly addressed
# to the recipient
!params["to"] && !params["cc"] && !params["bto"] && !params["bcc"] ->
true
# if the message is sent from somebody the user is following, then assume it
# is addressed to the recipient
User.following?(recipient, actor) ->
true
true ->
false
end
end
defp extract_list(target) when is_binary(target), do: [target]
defp extract_list(lst) when is_list(lst), do: lst
defp extract_list(_), do: []
def maybe_splice_recipient(ap_id, params) do
need_splice =
!recipient_in_collection(ap_id, params["to"]) &&
!recipient_in_collection(ap_id, params["cc"])
cc_list = extract_list(params["cc"])
if need_splice do
params
|> Map.put("cc", [ap_id | cc_list])
else
params
end
end
def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
"#{Web.base_url()}/schemas/litepub-0.1.jsonld",
%{
"@language" => "und"
}
]
}
end
def make_date do
DateTime.utc_now() |> DateTime.to_iso8601()
end
def generate_activity_id do
generate_id("activities")
end
def generate_context_id do
generate_id("contexts")
end
def generate_object_id do
Helpers.o_status_url(Endpoint, :object, UUID.generate())
end
def generate_id(type) do
"#{Web.base_url()}/#{type}/#{UUID.generate()}"
end
def get_notified_from_object(%{"type" => type} = object) when type in @supported_object_types do
fake_create_activity = %{
"to" => object["to"],
"cc" => object["cc"],
"type" => "Create",
"object" => object
}
Notification.get_notified_from_activity(%Activity{data: fake_create_activity}, false)
end
def get_notified_from_object(object) do
Notification.get_notified_from_activity(%Activity{data: object}, false)
end
def create_context(context) do
context = context || generate_id("contexts")
# Ecto has problems accessing the constraint inside the jsonb,
# so we explicitly check for the existed object before insert
object = Object.get_cached_by_ap_id(context)
with true <- is_nil(object),
changeset <- Object.context_mapping(context),
{:ok, inserted_object} <- Repo.insert(changeset) do
inserted_object
else
_ ->
object
end
end
@doc """
Enqueues an activity for federation if it's local
"""
def maybe_federate(%Activity{local: true} = activity) do
if Pleroma.Config.get!([:instance, :federating]) do
priority =
case activity.data["type"] do
"Delete" -> 10
"Create" -> 1
_ -> 5
end
Pleroma.Web.Federator.publish(activity, priority)
end
:ok
end
def maybe_federate(_), do: :ok
@doc """
Adds an id and a published data if they aren't there,
also adds it to an included object
"""
def lazy_put_activity_defaults(map, fake \\ false) do
map =
unless fake do
%{data: %{"id" => context}, id: context_id} = create_context(map["context"])
map
|> Map.put_new_lazy("id", &generate_activity_id/0)
|> Map.put_new_lazy("published", &make_date/0)
|> Map.put_new("context", context)
|> Map.put_new("context_id", context_id)
else
map
|> Map.put_new("id", "pleroma:fakeid")
|> Map.put_new_lazy("published", &make_date/0)
|> Map.put_new("context", "pleroma:fakecontext")
|> Map.put_new("context_id", -1)
end
if is_map(map["object"]) do
object = lazy_put_object_defaults(map["object"], map, fake)
%{map | "object" => object}
else
map
end
end
@doc """
Adds an id and published date if they aren't there.
"""
def lazy_put_object_defaults(map, activity \\ %{}, fake)
def lazy_put_object_defaults(map, activity, true = _fake) do
map
|> Map.put_new_lazy("published", &make_date/0)
|> Map.put_new("id", "pleroma:fake_object_id")
|> Map.put_new("context", activity["context"])
|> Map.put_new("fake", true)
|> Map.put_new("context_id", activity["context_id"])
end
def lazy_put_object_defaults(map, activity, _fake) do
map
|> Map.put_new_lazy("id", &generate_object_id/0)
|> Map.put_new_lazy("published", &make_date/0)
|> Map.put_new("context", activity["context"])
|> Map.put_new("context_id", activity["context_id"])
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => type} = object_data} = map)
when is_map(object_data) and type in @supported_object_types do
with {:ok, object} <- Object.create(object_data) do
map =
map
|> Map.put("object", object.data["id"])
{:ok, map, object}
end
end
def insert_full_object(map), do: {:ok, map, nil}
def update_object_in_activities(%{data: %{"id" => id}} = object) do
# TODO
# Update activities that already had this. Could be done in a seperate process.
# Alternatively, just don't do this and fetch the current object each time. Most
# could probably be taken from cache.
relevant_activities = Activity.get_all_create_by_object_ap_id(id)
Enum.map(relevant_activities, fn activity ->
new_activity_data = activity.data |> Map.put("object", object.data)
changeset = Changeset.change(activity, data: new_activity_data)
Repo.update(changeset)
end)
end
#### Like-related helpers
@doc """
Returns an existing like if a user already liked an object
"""
def get_existing_like(actor, %{data: %{"id" => id}}) do
query =
from(
activity in Activity,
where: fragment("(?)->>'actor' = ?", activity.data, ^actor),
# this is to use the index
where:
fragment(
"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
activity.data,
activity.data,
^id
),
where: fragment("(?)->>'type' = 'Like'", activity.data)
)
Repo.one(query)
end
@doc """
Returns like activities targeting an object
"""
def get_object_likes(%{data: %{"id" => id}}) do
query =
from(
activity in Activity,
# this is to use the index
where:
fragment(
"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
activity.data,
activity.data,
^id
),
where: fragment("(?)->>'type' = 'Like'", activity.data)
)
Repo.all(query)
end
def make_like_data(
%User{ap_id: ap_id} = actor,
%{data: %{"actor" => object_actor_id, "id" => id}} = object,
activity_id
) do
object_actor = User.get_cached_by_ap_id(object_actor_id)
to =
if Visibility.is_public?(object) do
[actor.follower_address, object.data["actor"]]
else
[object.data["actor"]]
end
cc =
(object.data["to"] ++ (object.data["cc"] || []))
|> List.delete(actor.ap_id)
|> List.delete(object_actor.follower_address)
data = %{
"type" => "Like",
"actor" => ap_id,
"object" => id,
"to" => to,
"cc" => cc,
"context" => object.data["context"]
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
def update_element_in_object(property, element, object) do
with new_data <-
object.data
|> Map.put("#{property}_count", length(element))
|> Map.put("#{property}s", element),
changeset <- Changeset.change(object, data: new_data),
{:ok, object} <- Object.update_and_set_cache(changeset),
_ <- update_object_in_activities(object) do
{:ok, object}
end
end
def update_likes_in_object(likes, object) do
update_element_in_object("like", likes, object)
end
def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
likes = if is_list(object.data["likes"]), do: object.data["likes"], else: []
with likes <- [actor | likes] |> Enum.uniq() do
update_likes_in_object(likes, object)
end
end
def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
likes = if is_list(object.data["likes"]), do: object.data["likes"], else: []
with likes <- likes |> List.delete(actor) do
update_likes_in_object(likes, object)
end
end
#### Follow-related helpers
@doc """
Updates a follow activity's state (for locked accounts).
"""
def update_follow_state_for_all(
%Activity{data: %{"actor" => actor, "object" => object}} = activity,
state
) do
try do
Ecto.Adapters.SQL.query!(
Repo,
"UPDATE activities SET data = jsonb_set(data, '{state}', $1) WHERE data->>'type' = 'Follow' AND data->>'actor' = $2 AND data->>'object' = $3 AND data->>'state' = 'pending'",
[state, actor, object]
)
activity = Activity.get_by_id(activity.id)
{:ok, activity}
rescue
e ->
{:error, e}
end
end
def update_follow_state(%Activity{} = activity, state) do
with new_data <-
activity.data
|> Map.put("state", state),
changeset <- Changeset.change(activity, data: new_data),
{:ok, activity} <- Repo.update(changeset) do
{:ok, activity}
end
end
@doc """
Makes a follow activity data for the given follower and followed
"""
def make_follow_data(
%User{ap_id: follower_id},
%User{ap_id: followed_id} = _followed,
activity_id
) do
data = %{
"type" => "Follow",
"actor" => follower_id,
"to" => [followed_id],
"cc" => [Pleroma.Constants.as_public()],
"object" => followed_id,
"state" => "pending"
}
data = if activity_id, do: Map.put(data, "id", activity_id), else: data
data
end
def fetch_latest_follow(%User{ap_id: follower_id}, %User{ap_id: followed_id}) do
query =
from(
activity in Activity,
where:
fragment(
"? ->> 'type' = 'Follow'",
activity.data
),
where: activity.actor == ^follower_id,
# this is to use the index
where:
fragment(
"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
activity.data,
activity.data,
^followed_id
),
order_by: [fragment("? desc nulls last", activity.id)],
limit: 1
)
Repo.one(query)
end
#### Announce-related helpers
@doc """
Retruns an existing announce activity if the notice has already been announced
"""
def get_existing_announce(actor, %{data: %{"id" => id}}) do
query =
from(
activity in Activity,
where: activity.actor == ^actor,
# this is to use the index
where:
fragment(
"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
activity.data,
activity.data,
^id
),
where: fragment("(?)->>'type' = 'Announce'", activity.data)
)
Repo.one(query)
end
@doc """
Make announce activity data for the given actor and object
"""
# for relayed messages, we only want to send to subscribers
def make_announce_data(
%User{ap_id: ap_id} = user,
%Object{data: %{"id" => id}} = object,
activity_id,
false
) do
data = %{
"type" => "Announce",
"actor" => ap_id,
"object" => id,
"to" => [user.follower_address],
"cc" => [],
"context" => object.data["context"]
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
def make_announce_data(
%User{ap_id: ap_id} = user,
%Object{data: %{"id" => id}} = object,
activity_id,
true
) do
data = %{
"type" => "Announce",
"actor" => ap_id,
"object" => id,
"to" => [user.follower_address, object.data["actor"]],
"cc" => [Pleroma.Constants.as_public()],
"context" => object.data["context"]
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
@doc """
Make unannounce activity data for the given actor and object
"""
def make_unannounce_data(
%User{ap_id: ap_id} = user,
%Activity{data: %{"context" => context}} = activity,
activity_id
) do
data = %{
"type" => "Undo",
"actor" => ap_id,
"object" => activity.data,
"to" => [user.follower_address, activity.data["actor"]],
"cc" => [Pleroma.Constants.as_public()],
"context" => context
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
def make_unlike_data(
%User{ap_id: ap_id} = user,
%Activity{data: %{"context" => context}} = activity,
activity_id
) do
data = %{
"type" => "Undo",
"actor" => ap_id,
"object" => activity.data,
"to" => [user.follower_address, activity.data["actor"]],
"cc" => [Pleroma.Constants.as_public()],
"context" => context
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
def add_announce_to_object(
%Activity{
data: %{"actor" => actor, "cc" => [Pleroma.Constants.as_public()]}
},
object
) do
announcements =
if is_list(object.data["announcements"]), do: object.data["announcements"], else: []
with announcements <- [actor | announcements] |> Enum.uniq() do
update_element_in_object("announcement", announcements, object)
end
end
def add_announce_to_object(_, object), do: {:ok, object}
def remove_announce_from_object(%Activity{data: %{"actor" => actor}}, object) do
announcements =
if is_list(object.data["announcements"]), do: object.data["announcements"], else: []
with announcements <- announcements |> List.delete(actor) do
update_element_in_object("announcement", announcements, object)
end
end
#### Unfollow-related helpers
def make_unfollow_data(follower, followed, follow_activity, activity_id) do
data = %{
"type" => "Undo",
"actor" => follower.ap_id,
"to" => [followed.ap_id],
"object" => follow_activity.data
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
#### Block-related helpers
def fetch_latest_block(%User{ap_id: blocker_id}, %User{ap_id: blocked_id}) do
query =
from(
activity in Activity,
where:
fragment(
"? ->> 'type' = 'Block'",
activity.data
),
where: activity.actor == ^blocker_id,
# this is to use the index
where:
fragment(
"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
activity.data,
activity.data,
^blocked_id
),
order_by: [fragment("? desc nulls last", activity.id)],
limit: 1
)
Repo.one(query)
end
def make_block_data(blocker, blocked, activity_id) do
data = %{
"type" => "Block",
"actor" => blocker.ap_id,
"to" => [blocked.ap_id],
"object" => blocked.ap_id
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
def make_unblock_data(blocker, blocked, block_activity, activity_id) do
data = %{
"type" => "Undo",
"actor" => blocker.ap_id,
"to" => [blocked.ap_id],
"object" => block_activity.data
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
#### Create-related helpers
def make_create_data(params, additional) do
published = params.published || make_date()
%{
"type" => "Create",
"to" => params.to |> Enum.uniq(),
"actor" => params.actor.ap_id,
"object" => params.object,
"published" => published,
"context" => params.context
}
|> Map.merge(additional)
end
#### Flag-related helpers
def make_flag_data(params, additional) do
status_ap_ids =
Enum.map(params.statuses || [], fn
%Activity{} = act -> act.data["id"]
act when is_map(act) -> act["id"]
act when is_binary(act) -> act
end)
object = [params.account.ap_id] ++ status_ap_ids
%{
"type" => "Flag",
"actor" => params.actor.ap_id,
"content" => params.content,
"object" => object,
"context" => params.context,
"state" => "open"
}
|> Map.merge(additional)
end
@doc """
Fetches the OrderedCollection/OrderedCollectionPage from `from`, limiting the amount of pages fetched after
the first one to `pages_left` pages.
If the amount of pages is higher than the collection has, it returns whatever was there.
"""
def fetch_ordered_collection(from, pages_left, acc \\ []) do
with {:ok, response} <- Tesla.get(from),
{:ok, collection} <- Jason.decode(response.body) do
case collection["type"] do
"OrderedCollection" ->
# If we've encountered the OrderedCollection and not the page,
# just call the same function on the page address
fetch_ordered_collection(collection["first"], pages_left)
"OrderedCollectionPage" ->
if pages_left > 0 do
# There are still more pages
if Map.has_key?(collection, "next") do
# There are still more pages, go deeper saving what we have into the accumulator
fetch_ordered_collection(
collection["next"],
pages_left - 1,
acc ++ collection["orderedItems"]
)
else
# No more pages left, just return whatever we already have
acc ++ collection["orderedItems"]
end
else
# Got the amount of pages needed, add them all to the accumulator
acc ++ collection["orderedItems"]
end
_ ->
{:error, "Not an OrderedCollection or OrderedCollectionPage"}
end
end
end
#### Report-related helpers
def update_report_state(%Activity{} = activity, state) when state in @supported_report_states do
with new_data <- Map.put(activity.data, "state", state),
changeset <- Changeset.change(activity, data: new_data),
{:ok, activity} <- Repo.update(changeset) do
{:ok, activity}
end
end
def update_report_state(_, _), do: {:error, "Unsupported state"}
def update_activity_visibility(activity, visibility) when visibility in @valid_visibilities do
[to, cc, recipients] =
activity
|> get_updated_targets(visibility)
|> Enum.map(&Enum.uniq/1)
object_data =
activity.object.data
|> Map.put("to", to)
|> Map.put("cc", cc)
{:ok, object} =
activity.object
|> Object.change(%{data: object_data})
|> Object.update_and_set_cache()
activity_data =
activity.data
|> Map.put("to", to)
|> Map.put("cc", cc)
activity
|> Map.put(:object, object)
|> Activity.change(%{data: activity_data, recipients: recipients})
|> Repo.update()
end
def update_activity_visibility(_, _), do: {:error, "Unsupported visibility"}
defp get_updated_targets(
%Activity{data: %{"to" => to} = data, recipients: recipients},
visibility
) do
cc = Map.get(data, "cc", [])
follower_address = User.get_cached_by_ap_id(data["actor"]).follower_address
public = Pleroma.Constants.as_public()
case visibility do
"public" ->
to = [public | List.delete(to, follower_address)]
cc = [follower_address | List.delete(cc, public)]
recipients = [public | recipients]
[to, cc, recipients]
"private" ->
to = [follower_address | List.delete(to, public)]
cc = List.delete(cc, public)
recipients = List.delete(recipients, public)
[to, cc, recipients]
"unlisted" ->
to = [follower_address | List.delete(to, public)]
cc = [public | List.delete(cc, follower_address)]
recipients = recipients ++ [follower_address, public]
[to, cc, recipients]
_ ->
[to, cc, recipients]
end
end
def get_existing_votes(actor, %{data: %{"id" => id}}) do
query =
from(
[activity, object: object] in Activity.with_preloaded_object(Activity),
where: fragment("(?)->>'type' = 'Create'", activity.data),
where: fragment("(?)->>'actor' = ?", activity.data, ^actor),
where:
fragment(
"(?)->>'inReplyTo' = ?",
object.data,
^to_string(id)
),
where: fragment("(?)->>'type' = 'Answer'", object.data)
)
Repo.all(query)
end
end