Pleroma/lib/pleroma/web/activity_pub/activity_pub.ex

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defmodule Pleroma.Web.ActivityPub.ActivityPub do
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alias Pleroma.{Activity, Repo, Object, Upload, User, Notification}
alias Pleroma.Web.ActivityPub.Transmogrifier
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alias Pleroma.Web.WebFinger
alias Pleroma.Web.Federator
alias Pleroma.Web.OStatus
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import Ecto.Query
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import Pleroma.Web.ActivityPub.Utils
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require Logger
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@httpoison Application.get_env(:pleroma, :httpoison)
def get_recipients(data) do
(data["to"] || []) ++ (data["cc"] || [])
end
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def insert(map, local \\ true) when is_map(map) do
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with nil <- Activity.get_by_ap_id(map["id"]),
map <- lazy_put_activity_defaults(map),
:ok <- insert_full_object(map) do
{:ok, activity} = Repo.insert(%Activity{data: map, local: local, actor: map["actor"], recipients: get_recipients(map)})
Notification.create_notifications(activity)
stream_out(activity)
{:ok, activity}
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else
%Activity{} = activity -> {:ok, activity}
error -> {:error, error}
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end
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end
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def stream_out(activity) do
if activity.data["type"] in ["Create", "Announce"] do
Pleroma.Web.Streamer.stream("user", activity)
if Enum.member?(activity.data["to"], "https://www.w3.org/ns/activitystreams#Public") do
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Pleroma.Web.Streamer.stream("public", activity)
if activity.local do
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Pleroma.Web.Streamer.stream("public:local", activity)
end
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end
end
end
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def create(%{to: to, actor: actor, context: context, object: object} = params) do
additional = params[:additional] || %{}
local = !(params[:local] == false) # only accept false as false value
published = params[:published]
with create_data <- make_create_data(%{to: to, actor: actor, published: published, context: context, object: object}, additional),
{:ok, activity} <- insert(create_data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
end
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end
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def accept(%{to: to, actor: actor, object: object} = params) do
local = !(params[:local] == false) # only accept false as false value
with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
{:ok, activity} <- insert(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
end
end
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# TODO: This is weird, maybe we shouldn't check here if we can make the activity.
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def like(%User{ap_id: ap_id} = user, %Object{data: %{"id" => _}} = object, activity_id \\ nil, local \\ true) do
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with nil <- get_existing_like(ap_id, object),
like_data <- make_like_data(user, object, activity_id),
{:ok, activity} <- insert(like_data, local),
{:ok, object} <- add_like_to_object(activity, object),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
else
%Activity{} = activity -> {:ok, activity, object}
error -> {:error, error}
end
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end
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def unlike(%User{} = actor, %Object{} = object) do
with %Activity{} = activity <- get_existing_like(actor.ap_id, object),
{:ok, _activity} <- Repo.delete(activity),
{:ok, object} <- remove_like_from_object(activity, object) do
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{:ok, object}
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else _e -> {:ok, object}
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end
end
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def announce(%User{ap_id: _} = user, %Object{data: %{"id" => _}} = object, activity_id \\ nil, local \\ true) do
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with true <- is_public?(object),
announce_data <- make_announce_data(user, object, activity_id),
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{:ok, activity} <- insert(announce_data, local),
{:ok, object} <- add_announce_to_object(activity, object),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
else
error -> {:error, error}
end
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end
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def follow(follower, followed, activity_id \\ nil, local \\ true) do
with data <- make_follow_data(follower, followed, activity_id),
{:ok, activity} <- insert(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
end
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end
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def unfollow(follower, followed, local \\ true) do
with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
unfollow_data <- make_unfollow_data(follower, followed, follow_activity),
{:ok, activity} <- insert(unfollow_data, local),
:ok, maybe_federate(activity) do
{:ok, activity}
end
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end
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def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
user = User.get_cached_by_ap_id(actor)
data = %{
"type" => "Delete",
"actor" => actor,
"object" => id,
"to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"]
}
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with Repo.delete(object),
Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
{:ok, activity} <- insert(data, local),
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:ok <- maybe_federate(activity) do
{:ok, activity}
end
end
def fetch_activities_for_context(context, opts \\ %{}) do
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public = ["https://www.w3.org/ns/activitystreams#Public"]
recipients = if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
query = from activity in Activity
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query = query
|> restrict_blocked(opts)
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|> restrict_recipients(recipients, opts["user"])
query = from activity in query,
where: fragment("?->>'type' = ? and ?->>'context' = ?", activity.data, "Create", activity.data, ^context),
order_by: [desc: :id]
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Repo.all(query)
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end
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def fetch_public_activities(opts \\ %{}) do
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public = %{to: ["https://www.w3.org/ns/activitystreams#Public"]}
q = fetch_activities_query([], opts)
q = from activity in q,
where: fragment(~s(? @> ?), activity.data, ^public)
q
|> Repo.all
|> Enum.reverse
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end
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defp restrict_since(query, %{"since_id" => since_id}) do
from activity in query, where: activity.id > ^since_id
end
defp restrict_since(query, _), do: query
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defp restrict_tag(query, %{"tag" => tag}) do
from activity in query,
where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data)
end
defp restrict_tag(query, _), do: query
defp restrict_recipients(query, [], user), do: query
defp restrict_recipients(query, recipients, nil) do
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from activity in query,
where: fragment("? && ?", ^recipients, activity.recipients)
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end
defp restrict_recipients(query, recipients, user) do
from activity in query,
where: fragment("? && ?", ^recipients, activity.recipients),
or_where: activity.actor == ^user.ap_id
end
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defp restrict_local(query, %{"local_only" => true}) do
from activity in query, where: activity.local == true
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end
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defp restrict_local(query, _), do: query
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defp restrict_max(query, %{"max_id" => max_id}) do
from activity in query, where: activity.id < ^max_id
end
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defp restrict_max(query, _), do: query
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defp restrict_actor(query, %{"actor_id" => actor_id}) do
from activity in query,
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where: activity.actor == ^actor_id
end
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defp restrict_actor(query, _), do: query
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defp restrict_type(query, %{"type" => type}) when is_binary(type) do
restrict_type(query, %{"type" => [type]})
end
defp restrict_type(query, %{"type" => type}) do
from activity in query,
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where: fragment("?->>'type' = ANY(?)", activity.data, ^type)
end
defp restrict_type(query, _), do: query
defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
from activity in query,
where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data)
end
defp restrict_favorited_by(query, _), do: query
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defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
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from activity in query,
where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[])
end
defp restrict_media(query, _), do: query
# Only search through last 100_000 activities by default
defp restrict_recent(query, %{"whole_db" => true}), do: query
defp restrict_recent(query, _) do
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since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
from activity in query,
where: activity.id > ^since
end
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defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
blocks = info["blocks"] || []
from activity in query,
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where: fragment("not (? = ANY(?))", activity.actor, ^blocks)
end
defp restrict_blocked(query, _), do: query
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def fetch_activities_query(recipients, opts \\ %{}) do
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base_query = from activity in Activity,
limit: 20,
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order_by: [fragment("? desc nulls last", activity.id)]
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base_query
|> restrict_recipients(recipients, opts["user"])
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|> restrict_tag(opts)
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|> restrict_since(opts)
|> restrict_local(opts)
|> restrict_max(opts)
|> restrict_actor(opts)
|> restrict_type(opts)
|> restrict_favorited_by(opts)
|> restrict_recent(opts)
|> restrict_blocked(opts)
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|> restrict_media(opts)
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end
def fetch_activities(recipients, opts \\ %{}) do
fetch_activities_query(recipients, opts)
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|> Repo.all
|> Enum.reverse
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end
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def upload(file) do
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data = Upload.store(file)
Repo.insert(%Object{data: data})
end
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def fetch_and_prepare_user_from_ap_id(ap_id) do
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with {:ok, %{status_code: 200, body: body}} <- @httpoison.get(ap_id, ["Accept": "application/activity+json"]),
{:ok, data} <- Poison.decode(body)
do
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avatar = %{
"type" => "Image",
"url" => [%{"href" => data["icon"]["url"]}]
}
banner = %{
"type" => "Image",
"url" => [%{"href" => data["image"]["url"]}]
}
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user_data = %{
ap_id: data["id"],
info: %{
"ap_enabled" => true,
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"source_data" => data,
"banner" => banner
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},
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avatar: avatar,
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nickname: "#{data["preferredUsername"]}@#{URI.parse(ap_id).host}",
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name: data["name"],
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follower_address: data["followers"],
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}
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{:ok, user_data}
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else
e -> Logger.error("Could not user at fetch #{ap_id}, #{inspect(e)}")
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end
end
def make_user_from_ap_id(ap_id) do
if user = User.get_by_ap_id(ap_id) do
Transmogrifier.upgrade_user_from_ap_id(ap_id)
else
with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
User.insert_or_update_user(data)
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else
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e -> e
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end
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end
end
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def make_user_from_nickname(nickname) do
with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
make_user_from_ap_id(ap_id)
end
end
def publish(actor, activity) do
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followers = if actor.follower_address in activity.recipients do
{:ok, followers} = User.get_followers(actor)
followers
else
[]
end
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remote_inboxes = (Pleroma.Web.Salmon.remote_users(activity) ++ followers)
|> Enum.filter(fn (user) -> User.ap_enabled?(user) end)
|> Enum.map(fn (%{info: %{"source_data" => data}}) ->
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(data["endpoints"] && data["endpoints"]["sharedInbox"]) || data["inbox"]
end)
|> Enum.uniq
{:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
json = Poison.encode!(data)
Enum.each remote_inboxes, fn(inbox) ->
Federator.enqueue(:publish_single_ap, %{inbox: inbox, json: json, actor: actor, id: activity.data["id"]})
end
end
def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
Logger.info("Federating #{id} to #{inbox}")
host = URI.parse(inbox).host
signature = Pleroma.Web.HTTPSignatures.sign(actor, %{host: host, "content-length": byte_size(json)})
@httpoison.post(inbox, json, [{"Content-Type", "application/activity+json"}, {"signature", signature}])
end
# TODO:
# This will create a Create activity, which we need internally at the moment.
def fetch_object_from_id(id) do
if object = Object.get_cached_by_ap_id(id) do
{:ok, object}
else
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Logger.info("Fetching #{id} via AP")
with {:ok, %{body: body, status_code: code}} when code in 200..299 <- @httpoison.get(id, [Accept: "application/activity+json"], follow_redirect: true, timeout: 10000, recv_timeout: 20000),
{:ok, data} <- Poison.decode(body),
nil <- Object.get_by_ap_id(data["id"]),
params <- %{"type" => "Create", "to" => data["to"], "cc" => data["cc"], "actor" => data["attributedTo"], "object" => data},
{:ok, activity} <- Transmogrifier.handle_incoming(params) do
{:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
else
object = %Object{} -> {:ok, object}
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e ->
Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
case OStatus.fetch_activity_from_url(id) do
{:ok, [activity | _]} -> {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
e -> e
end
end
end
end
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def is_public?(activity) do
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"https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++ (activity.data["cc"] || []))
end
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def visible_for_user?(activity, nil) do
is_public?(activity)
end
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def visible_for_user?(activity, user) do
x = [user.ap_id | user.following]
y = (activity.data["to"] ++ (activity.data["cc"] || []))
visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y))
end
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end