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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.MastodonAPI.TimelineController do
use Pleroma.Web, :controller
import Pleroma.Web.ControllerHelper,
only: [add_link_headers: 2, add_link_headers: 3]
alias Pleroma.Config
alias Pleroma.Pagination
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.Plugs.EnsurePublicOrAuthenticatedPlug
alias Pleroma.Web.Plugs.OAuthScopesPlug
alias Pleroma.Web.Plugs.RateLimiter
plug(Pleroma.Web.ApiSpec.CastAndValidate)
plug(:skip_plug, EnsurePublicOrAuthenticatedPlug when action in [:public, :hashtag])
# TODO: Replace with a macro when there is a Phoenix release with the following commit in it:
# https://github.com/phoenixframework/phoenix/commit/2e8c63c01fec4dde5467dbbbf9705ff9e780735e
plug(RateLimiter, [name: :timeline, bucket_name: :direct_timeline] when action == :direct)
plug(RateLimiter, [name: :timeline, bucket_name: :public_timeline] when action == :public)
plug(RateLimiter, [name: :timeline, bucket_name: :home_timeline] when action == :home)
plug(RateLimiter, [name: :timeline, bucket_name: :hashtag_timeline] when action == :hashtag)
plug(RateLimiter, [name: :timeline, bucket_name: :list_timeline] when action == :list)
plug(OAuthScopesPlug, %{scopes: ["read:statuses"]} when action in [:home, :direct])
plug(OAuthScopesPlug, %{scopes: ["read:lists"]} when action == :list)
plug(
OAuthScopesPlug,
%{scopes: ["read:statuses"], fallback: :proceed_unauthenticated}
when action in [:public, :hashtag]
)
plug(:put_view, Pleroma.Web.MastodonAPI.StatusView)
defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.TimelineOperation
# GET /api/v1/timelines/home
def home(%{assigns: %{user: user}} = conn, params) do
params =
params
|> Map.put(:type, ["Create", "Announce"])
|> Map.put(:blocking_user, user)
|> Map.put(:muting_user, user)
|> Map.put(:reply_filtering_user, user)
|> Map.put(:announce_filtering_user, user)
|> Map.put(:user, user)
|> Map.put(:local_only, params[:local])
|> Map.delete(:local)
activities =
[user.ap_id | User.following(user)]
|> ActivityPub.fetch_activities(params)
|> Enum.reverse()
conn
|> add_link_headers(activities)
|> render("index.json",
activities: activities,
for: user,
as: :activity,
with_muted: Map.get(params, :with_muted, false)
)
end
# GET /api/v1/timelines/direct
def direct(%{assigns: %{user: user}} = conn, params) do
params =
params
|> Map.put(:type, "Create")
|> Map.put(:blocking_user, user)
|> Map.put(:user, user)
|> Map.put(:visibility, "direct")
activities =
[user.ap_id]
|> ActivityPub.fetch_activities_query(params)
|> Pagination.fetch_paginated(params)
conn
|> add_link_headers(activities)
|> render("index.json",
activities: activities,
for: user,
as: :activity
)
end
defp restrict_unauthenticated?(true = _local_only) do
Config.restrict_unauthenticated_access?(:timelines, :local)
end
defp restrict_unauthenticated?(_) do
Config.restrict_unauthenticated_access?(:timelines, :federated)
end
# GET /api/v1/timelines/public
def public(%{assigns: %{user: user}} = conn, params) do
local_only = params[:local]
if is_nil(user) and restrict_unauthenticated?(local_only) do
fail_on_bad_auth(conn)
else
activities =
params
|> Map.put(:type, ["Create"])
|> Map.put(:local_only, local_only)
|> Map.put(:blocking_user, user)
|> Map.put(:muting_user, user)
|> Map.put(:reply_filtering_user, user)
|> Map.put(:instance, params[:instance])
|> ActivityPub.fetch_public_activities()
conn
|> add_link_headers(activities, %{"local" => local_only})
|> render("index.json",
activities: activities,
for: user,
as: :activity,
with_muted: Map.get(params, :with_muted, false)
)
end
end
defp fail_on_bad_auth(conn) do
render_error(conn, :unauthorized, "authorization required for timeline view")
end
defp hashtag_fetching(params, user, local_only) do
tags =
[params[:tag], params[:any]]
|> List.flatten()
|> Enum.uniq()
|> Enum.reject(&is_nil/1)
|> Enum.map(&String.downcase/1)
tag_all =
params
|> Map.get(:all, [])
|> Enum.map(&String.downcase/1)
tag_reject =
params
|> Map.get(:none, [])
|> Enum.map(&String.downcase/1)
_activities =
params
|> Map.put(:type, "Create")
|> Map.put(:local_only, local_only)
|> Map.put(:blocking_user, user)
|> Map.put(:muting_user, user)
|> Map.put(:user, user)
|> Map.put(:tag, tags)
|> Map.put(:tag_all, tag_all)
|> Map.put(:tag_reject, tag_reject)
|> ActivityPub.fetch_public_activities()
end
# GET /api/v1/timelines/tag/:tag
def hashtag(%{assigns: %{user: user}} = conn, params) do
local_only = params[:local]
if is_nil(user) and restrict_unauthenticated?(local_only) do
fail_on_bad_auth(conn)
else
activities = hashtag_fetching(params, user, local_only)
conn
|> add_link_headers(activities, %{"local" => local_only})
|> render("index.json",
activities: activities,
for: user,
as: :activity,
with_muted: Map.get(params, :with_muted, false)
)
end
end
# GET /api/v1/timelines/list/:list_id
def list(%{assigns: %{user: user}} = conn, %{list_id: id} = params) do
with %Pleroma.List{title: _title, following: following} <- Pleroma.List.get(id, user) do
params =
params
|> Map.put(:type, "Create")
|> Map.put(:blocking_user, user)
|> Map.put(:user, user)
|> Map.put(:muting_user, user)
|> Map.put(:local_only, params[:local])
# we must filter the following list for the user to avoid leaking statuses the user
# does not actually have permission to see (for more info, peruse security issue #270).
user_following = User.following(user)
activities =
following
|> Enum.filter(fn x -> x in user_following end)
|> ActivityPub.fetch_activities_bounded(following, params)
|> Enum.reverse()
render(conn, "index.json",
activities: activities,
for: user,
as: :activity,
with_muted: Map.get(params, :with_muted, false)
)
else
_e -> render_error(conn, :forbidden, "Error.")
end
end
end
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