git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/activity_pub.ex

   1 defmodule Pleroma.Web.ActivityPub.ActivityPub do
   2   alias Pleroma.{Activity, Repo, Object, Upload, User, Notification}
   3   alias Pleroma.Web.ActivityPub.Transmogrifier
   4   alias Pleroma.Web.WebFinger
   5   alias Pleroma.Web.Federator
   6   alias Pleroma.Web.OStatus
   7   import Ecto.Query
   8   import Pleroma.Web.ActivityPub.Utils
   9   require Logger
  10
  11   @httpoison Application.get_env(:pleroma, :httpoison)
  12
  13   def get_recipients(data) do
  14     (data["to"] || []) ++ (data["cc"] || [])
  15   end
  16
  17   def insert(map, local \\ true) when is_map(map) do
  18     with nil <- Activity.get_by_ap_id(map["id"]),
  19          map <- lazy_put_activity_defaults(map),
  20          :ok <- insert_full_object(map) do
  21       {:ok, activity} = Repo.insert(%Activity{data: map, local: local, actor: map["actor"], recipients: get_recipients(map)})
  22       Notification.create_notifications(activity)
  23       stream_out(activity)
  24       {:ok, activity}
  25     else
  26       %Activity{} = activity -> {:ok, activity}
  27       error -> {:error, error}
  28     end
  29   end
  30
  31   def stream_out(activity) do
  32     if activity.data["type"] in ["Create", "Announce"] do
  33       Pleroma.Web.Streamer.stream("user", activity)
  34       if Enum.member?(activity.data["to"], "https://www.w3.org/ns/activitystreams#Public") do
  35         Pleroma.Web.Streamer.stream("public", activity)
  36         if activity.local do
  37           Pleroma.Web.Streamer.stream("public:local", activity)
  38         end
  39       end
  40     end
  41   end
  42
  43   def create(%{to: to, actor: actor, context: context, object: object} = params) do
  44     additional = params[:additional] || %{}
  45     local = !(params[:local] == false) # only accept false as false value
  46     published = params[:published]
  47
  48     with create_data <- make_create_data(%{to: to, actor: actor, published: published, context: context, object: object}, additional),
  49          {:ok, activity} <- insert(create_data, local),
  50          :ok <- maybe_federate(activity) do
  51       {:ok, activity}
  52     end
  53   end
  54
  55   def accept(%{to: to, actor: actor, object: object} = params) do
  56     local = !(params[:local] == false) # only accept false as false value
  57
  58     with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
  59          {:ok, activity} <- insert(data, local),
  60          :ok <- maybe_federate(activity) do
  61       {:ok, activity}
  62     end
  63   end
  64
  65   # TODO: This is weird, maybe we shouldn't check here if we can make the activity.
  66   def like(%User{ap_id: ap_id} = user, %Object{data: %{"id" => _}} = object, activity_id \\ nil, local \\ true) do
  67     with nil <- get_existing_like(ap_id, object),
  68          like_data <- make_like_data(user, object, activity_id),
  69          {:ok, activity} <- insert(like_data, local),
  70          {:ok, object} <- add_like_to_object(activity, object),
  71          :ok <- maybe_federate(activity) do
  72       {:ok, activity, object}
  73     else
  74       %Activity{} = activity -> {:ok, activity, object}
  75       error -> {:error, error}
  76     end
  77   end
  78
  79   def unlike(%User{} = actor, %Object{} = object) do
  80     with %Activity{} = activity <- get_existing_like(actor.ap_id, object),
  81          {:ok, _activity} <- Repo.delete(activity),
  82          {:ok, object} <- remove_like_from_object(activity, object) do
  83       {:ok, object}
  84       else _e -> {:ok, object}
  85     end
  86   end
  87
  88   def announce(%User{ap_id: _} = user, %Object{data: %{"id" => _}} = object, activity_id \\ nil, local \\ true) do
  89     with true <- is_public?(object),
  90          announce_data <- make_announce_data(user, object, activity_id),
  91          {:ok, activity} <- insert(announce_data, local),
  92          {:ok, object} <- add_announce_to_object(activity, object),
  93          :ok <- maybe_federate(activity) do
  94       {:ok, activity, object}
  95     else
  96       error -> {:error, error}
  97     end
  98   end
  99
 100   def follow(follower, followed, activity_id \\ nil, local \\ true) do
 101     with data <- make_follow_data(follower, followed, activity_id),
 102          {:ok, activity} <- insert(data, local),
 103          :ok <- maybe_federate(activity) do
 104       {:ok, activity}
 105     end
 106   end
 107
 108   def unfollow(follower, followed, local \\ true) do
 109     with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
 110          unfollow_data <- make_unfollow_data(follower, followed, follow_activity),
 111          {:ok, activity} <- insert(unfollow_data, local),
 112          :ok, maybe_federate(activity) do
 113       {:ok, activity}
 114     end
 115   end
 116
 117   def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
 118     user = User.get_cached_by_ap_id(actor)
 119     data = %{
 120       "type" => "Delete",
 121       "actor" => actor,
 122       "object" => id,
 123       "to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"]
 124     }
 125     with Repo.delete(object),
 126          Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
 127          {:ok, activity} <- insert(data, local),
 128          :ok <- maybe_federate(activity) do
 129       {:ok, activity}
 130     end
 131   end
 132
 133   def fetch_activities_for_context(context, opts \\ %{}) do
 134     public = ["https://www.w3.org/ns/activitystreams#Public"]
 135     recipients = if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
 136
 137     query = from activity in Activity
 138     query = query
 139       |> restrict_blocked(opts)
 140       |> restrict_recipients(recipients, opts["user"])
 141
 142    query = from activity in query,
 143       where: fragment("?->>'type' = ? and ?->>'context' = ?", activity.data, "Create", activity.data, ^context),
 144       order_by: [desc: :id]
 145     Repo.all(query)
 146   end
 147
 148   def fetch_public_activities(opts \\ %{}) do
 149     public = %{to: ["https://www.w3.org/ns/activitystreams#Public"]}
 150     q = fetch_activities_query([], opts)
 151     q = from activity in q,
 152       where: fragment(~s(? @> ?), activity.data, ^public)
 153     q
 154     |> Repo.all
 155     |> Enum.reverse
 156   end
 157
 158   defp restrict_since(query, %{"since_id" => since_id}) do
 159     from activity in query, where: activity.id > ^since_id
 160   end
 161   defp restrict_since(query, _), do: query
 162
 163   defp restrict_tag(query, %{"tag" => tag}) do
 164     from activity in query,
 165       where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data)
 166   end
 167   defp restrict_tag(query, _), do: query
 168
 169   defp restrict_recipients(query, [], user), do: query
 170   defp restrict_recipients(query, recipients, nil) do
 171     from activity in query,
 172      where: fragment("? && ?", ^recipients, activity.recipients)
 173   end
 174   defp restrict_recipients(query, recipients, user) do
 175     from activity in query,
 176       where: fragment("? && ?", ^recipients, activity.recipients),
 177       or_where: activity.actor == ^user.ap_id
 178   end
 179
 180   defp restrict_local(query, %{"local_only" => true}) do
 181     from activity in query, where: activity.local == true
 182   end
 183   defp restrict_local(query, _), do: query
 184
 185   defp restrict_max(query, %{"max_id" => max_id}) do
 186     from activity in query, where: activity.id < ^max_id
 187   end
 188   defp restrict_max(query, _), do: query
 189
 190   defp restrict_actor(query, %{"actor_id" => actor_id}) do
 191     from activity in query,
 192       where: activity.actor == ^actor_id
 193   end
 194   defp restrict_actor(query, _), do: query
 195
 196   defp restrict_type(query, %{"type" => type}) when is_binary(type) do
 197     restrict_type(query, %{"type" => [type]})
 198   end
 199   defp restrict_type(query, %{"type" => type}) do
 200     from activity in query,
 201       where: fragment("?->>'type' = ANY(?)", activity.data, ^type)
 202   end
 203   defp restrict_type(query, _), do: query
 204
 205   defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
 206     from activity in query,
 207       where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data)
 208   end
 209   defp restrict_favorited_by(query, _), do: query
 210
 211   defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
 212     from activity in query,
 213       where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[])
 214   end
 215   defp restrict_media(query, _), do: query
 216
 217   # Only search through last 100_000 activities by default
 218   defp restrict_recent(query, %{"whole_db" => true}), do: query
 219   defp restrict_recent(query, _) do
 220     since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
 221
 222     from activity in query,
 223       where: activity.id > ^since
 224   end
 225
 226   defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
 227     blocks = info["blocks"] || []
 228     from activity in query,
 229       where: fragment("not (? = ANY(?))", activity.actor, ^blocks)
 230   end
 231   defp restrict_blocked(query, _), do: query
 232
 233   def fetch_activities_query(recipients, opts \\ %{}) do
 234     base_query = from activity in Activity,
 235       limit: 20,
 236       order_by: [fragment("? desc nulls last", activity.id)]
 237
 238     base_query
 239     |> restrict_recipients(recipients, opts["user"])
 240     |> restrict_tag(opts)
 241     |> restrict_since(opts)
 242     |> restrict_local(opts)
 243     |> restrict_max(opts)
 244     |> restrict_actor(opts)
 245     |> restrict_type(opts)
 246     |> restrict_favorited_by(opts)
 247     |> restrict_recent(opts)
 248     |> restrict_blocked(opts)
 249     |> restrict_media(opts)
 250   end
 251
 252   def fetch_activities(recipients, opts \\ %{}) do
 253     fetch_activities_query(recipients, opts)
 254     |> Repo.all
 255     |> Enum.reverse
 256   end
 257
 258   def upload(file) do
 259     data = Upload.store(file)
 260     Repo.insert(%Object{data: data})
 261   end
 262
 263   def fetch_and_prepare_user_from_ap_id(ap_id) do
 264     with {:ok, %{status_code: 200, body: body}} <- @httpoison.get(ap_id, ["Accept": "application/activity+json"]),
 265     {:ok, data} <- Poison.decode(body)
 266       do
 267       avatar = %{
 268         "type" => "Image",
 269         "url" => [%{"href" => data["icon"]["url"]}]
 270       }
 271
 272       banner = %{
 273         "type" => "Image",
 274         "url" => [%{"href" => data["image"]["url"]}]
 275       }
 276
 277       user_data = %{
 278         ap_id: data["id"],
 279         info: %{
 280           "ap_enabled" => true,
 281           "source_data" => data,
 282           "banner" => banner
 283         },
 284         avatar: avatar,
 285         nickname: "#{data["preferredUsername"]}@#{URI.parse(ap_id).host}",
 286         name: data["name"],
 287         follower_address: data["followers"],
 288       }
 289
 290       {:ok, user_data}
 291     end
 292   end
 293
 294   def make_user_from_ap_id(ap_id) do
 295     if user = User.get_by_ap_id(ap_id) do
 296       Transmogrifier.upgrade_user_from_ap_id(ap_id)
 297     else
 298       with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
 299         User.insert_or_update_user(data)
 300       else
 301         e -> e
 302       end
 303     end
 304   end
 305
 306   def make_user_from_nickname(nickname) do
 307     with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
 308       make_user_from_ap_id(ap_id)
 309     end
 310   end
 311
 312   def publish(actor, activity) do
 313     followers = if actor.follower_address in activity.recipients do
 314       {:ok, followers} = User.get_followers(actor)
 315       followers
 316     else
 317       []
 318     end
 319
 320     remote_inboxes = (Pleroma.Web.Salmon.remote_users(activity) ++ followers)
 321     |> Enum.filter(fn (user) -> User.ap_enabled?(user) end)
 322     |> Enum.map(fn (%{info: %{"source_data" => data}}) ->
 323       (data["endpoints"] && data["endpoints"]["sharedInbox"]) || data["inbox"]
 324     end)
 325     |> Enum.uniq
 326
 327     {:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
 328     json = Poison.encode!(data)
 329     Enum.each remote_inboxes, fn(inbox) ->
 330       Federator.enqueue(:publish_single_ap, %{inbox: inbox, json: json, actor: actor, id: activity.data["id"]})
 331     end
 332   end
 333
 334   def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
 335     Logger.info("Federating #{id} to #{inbox}")
 336     host = URI.parse(inbox).host
 337     signature = Pleroma.Web.HTTPSignatures.sign(actor, %{host: host, "content-length": byte_size(json)})
 338     @httpoison.post(inbox, json, [{"Content-Type", "application/activity+json"}, {"signature", signature}])
 339   end
 340
 341   # TODO:
 342   # This will create a Create activity, which we need internally at the moment.
 343   def fetch_object_from_id(id) do
 344     if object = Object.get_cached_by_ap_id(id) do
 345       {:ok, object}
 346     else
 347       Logger.info("Fetching #{id} via AP")
 348       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),
 349            {:ok, data} <- Poison.decode(body),
 350            nil <- Object.get_by_ap_id(data["id"]),
 351            params <- %{"type" => "Create", "to" => data["to"], "cc" => data["cc"], "actor" => data["attributedTo"], "object" => data},
 352            {:ok, activity} <- Transmogrifier.handle_incoming(params) do
 353         {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 354       else
 355         object = %Object{} -> {:ok, object}
 356       e ->
 357         Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
 358         case OStatus.fetch_activity_from_url(id) do
 359           {:ok, [activity | _]} -> {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 360           _ -> e
 361         end
 362       end
 363     end
 364   end
 365
 366   def is_public?(activity) do
 367     "https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++ (activity.data["cc"] || []))
 368   end
 369
 370   def visible_for_user?(activity, nil) do
 371     is_public?(activity)
 372   end
 373   def visible_for_user?(activity, user) do
 374     x = [user.ap_id | user.following]
 375     y = (activity.data["to"] ++ (activity.data["cc"] || []))
 376     visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y))
 377   end
 378 end