constants: add as_public constant and use it everywhere

lib/mix/tasks/pleroma/database.ex

@@ -8,6 +8,7 @@ defmodule Mix.Tasks.Pleroma.Database do
   alias Pleroma.Repo
   alias Pleroma.User
   require Logger
+  require Pleroma.Constants
   import Mix.Pleroma
   use Mix.Task
 
@@ -99,10 +100,15 @@ def run(["prune_objects" | args]) do
       NaiveDateTime.utc_now()
       |> NaiveDateTime.add(-(deadline * 86_400))
 
-    public = "https://www.w3.org/ns/activitystreams#Public"
-
     from(o in Object,
-      where: fragment("?->'to' \\? ? OR ?->'cc' \\? ?", o.data, ^public, o.data, ^public),
+      where:
+        fragment(
+          "?->'to' \\? ? OR ?->'cc' \\? ?",
+          o.data,
+          ^Pleroma.Constants.as_public(),
+          o.data,
+          ^Pleroma.Constants.as_public()
+        ),
       where: o.inserted_at < ^time_deadline,
       where:
         fragment("split_part(?->>'actor', '/', 3) != ?", o.data, ^Pleroma.Web.Endpoint.host())

lib/pleroma/activity/search.ex

@@ -9,6 +9,8 @@ defmodule Pleroma.Activity.Search do
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.Visibility
 
+  require Pleroma.Constants
+
   import Ecto.Query
 
   def search(user, search_query, options \\ []) do
@@ -39,7 +41,7 @@ def maybe_restrict_author(query, _), do: query
   defp restrict_public(q) do
     from([a, o] in q,
       where: fragment("?->>'type' = 'Create'", a.data),
-      where: "https://www.w3.org/ns/activitystreams#Public" in a.recipients
+      where: ^Pleroma.Constants.as_public() in a.recipients
     )
   end
 

lib/pleroma/constants.ex

+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Constants do
+  use Const
+
+  const(as_public, do: "https://www.w3.org/ns/activitystreams#Public")
+end

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -23,6 +23,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
   import Pleroma.Web.ActivityPub.Visibility
 
   require Logger
+  require Pleroma.Constants
 
   # For Announce activities, we filter the recipients based on following status for any actors
   # that match actual users.  See issue #164 for more information about why this is necessary.
@@ -207,8 +208,6 @@ def stream_out_participations(%Object{data: %{"context" => context}}, user) do
   def stream_out_participations(_, _), do: :noop
 
   def stream_out(activity) do
-    public = "https://www.w3.org/ns/activitystreams#Public"
-
     if activity.data["type"] in ["Create", "Announce", "Delete"] do
       object = Object.normalize(activity)
       # Do not stream out poll replies
@@ -216,7 +215,7 @@ def stream_out(activity) do
         Pleroma.Web.Streamer.stream("user", activity)
         Pleroma.Web.Streamer.stream("list", activity)
 
-        if Enum.member?(activity.data["to"], public) do
+        if get_visibility(activity) == "public" do
           Pleroma.Web.Streamer.stream("public", activity)
 
           if activity.local do
@@ -238,13 +237,8 @@ def stream_out(activity) do
             end
           end
         else
-          # TODO: Write test, replace with visibility test
-          if !Enum.member?(activity.data["cc"] || [], public) &&
-               !Enum.member?(
-                 activity.data["to"],
-                 User.get_cached_by_ap_id(activity.data["actor"]).follower_address
-               ),
-             do: Pleroma.Web.Streamer.stream("direct", activity)
+          if get_visibility(activity) == "direct",
+            do: Pleroma.Web.Streamer.stream("direct", activity)
         end
       end
     end
@@ -514,7 +508,7 @@ def flag(
   end
 
   defp fetch_activities_for_context_query(context, opts) do
-    public = ["https://www.w3.org/ns/activitystreams#Public"]
+    public = [Pleroma.Constants.as_public()]
 
     recipients =
       if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
@@ -555,7 +549,7 @@ def fetch_latest_activity_id_for_context(context, opts \\ %{}) do
   end
 
   def fetch_public_activities(opts \\ %{}) do
-    q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts)
+    q = fetch_activities_query([Pleroma.Constants.as_public()], opts)
 
     q
     |> restrict_unlisted()
@@ -646,10 +640,9 @@ defp user_activities_recipients(%{"godmode" => true}) do
 
   defp user_activities_recipients(%{"reading_user" => reading_user}) do
     if reading_user do
-      ["https://www.w3.org/ns/activitystreams#Public"] ++
-        [reading_user.ap_id | reading_user.following]
+      [Pleroma.Constants.as_public()] ++ [reading_user.ap_id | reading_user.following]
     else
-      ["https://www.w3.org/ns/activitystreams#Public"]
+      [Pleroma.Constants.as_public()]
     end
   end
 
@@ -834,7 +827,7 @@ defp restrict_unlisted(query) do
         fragment(
           "not (coalesce(?->'cc', '{}'::jsonb) \\?| ?)",
           activity.data,
-          ^["https://www.w3.org/ns/activitystreams#Public"]
+          ^[Pleroma.Constants.as_public()]
         )
     )
   end
@@ -971,7 +964,7 @@ def fetch_activities_bounded_query(query, recipients, recipients_with_public) do
       where:
         fragment("? && ?", activity.recipients, ^recipients) or
           (fragment("? && ?", activity.recipients, ^recipients_with_public) and
-             "https://www.w3.org/ns/activitystreams#Public" in activity.recipients)
+             ^Pleroma.Constants.as_public() in activity.recipients)
     )
   end
 

lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex

@@ -4,6 +4,9 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF.HellthreadPolicy do
   alias Pleroma.User
+
+  require Pleroma.Constants
+
   @moduledoc "Block messages with too much mentions (configurable)"
 
   @behaviour Pleroma.Web.ActivityPub.MRF
@@ -19,12 +22,12 @@ defp delist_message(message, threshold) when threshold > 0 do
         when follower_collection? and recipients > threshold ->
           message
           |> Map.put("to", [follower_collection])
-          |> Map.put("cc", ["https://www.w3.org/ns/activitystreams#Public"])
+          |> Map.put("cc", [Pleroma.Constants.as_public()])
 
         {:public, recipients} when recipients > threshold ->
           message
           |> Map.put("to", [])
-          |> Map.put("cc", ["https://www.w3.org/ns/activitystreams#Public"])
+          |> Map.put("cc", [Pleroma.Constants.as_public()])
 
         _ ->
           message
@@ -51,10 +54,10 @@ defp get_recipient_count(message) do
     recipients = (message["to"] || []) ++ (message["cc"] || [])
     follower_collection = User.get_cached_by_ap_id(message["actor"]).follower_address
 
-    if Enum.member?(recipients, "https://www.w3.org/ns/activitystreams#Public") do
+    if Enum.member?(recipients, Pleroma.Constants.as_public()) do
       recipients =
         recipients
-        |> List.delete("https://www.w3.org/ns/activitystreams#Public")
+        |> List.delete(Pleroma.Constants.as_public())
         |> List.delete(follower_collection)
 
       {:public, length(recipients)}

lib/pleroma/web/activity_pub/mrf/keyword_policy.ex

@@ -3,6 +3,8 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
+  require Pleroma.Constants
+
   @moduledoc "Reject or Word-Replace messages with a keyword or regex"
 
   @behaviour Pleroma.Web.ActivityPub.MRF
@@ -31,12 +33,12 @@ defp check_reject(%{"object" => %{"content" => content, "summary" => summary}} =
   defp check_ftl_removal(
          %{"to" => to, "object" => %{"content" => content, "summary" => summary}} = message
        ) do
-    if "https://www.w3.org/ns/activitystreams#Public" in to and
+    if Pleroma.Constants.as_public() in to and
          Enum.any?(Pleroma.Config.get([:mrf_keyword, :federated_timeline_removal]), fn pattern ->
            string_matches?(content, pattern) or string_matches?(summary, pattern)
          end) do
-      to = List.delete(to, "https://www.w3.org/ns/activitystreams#Public")
-      cc = ["https://www.w3.org/ns/activitystreams#Public" | message["cc"] || []]
+      to = List.delete(to, Pleroma.Constants.as_public())
+      cc = [Pleroma.Constants.as_public() | message["cc"] || []]
 
       message =
         message

lib/pleroma/web/activity_pub/mrf/reject_non_public.ex

@@ -10,7 +10,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.RejectNonPublic do
 
   @behaviour Pleroma.Web.ActivityPub.MRF
 
-  @public "https://www.w3.org/ns/activitystreams#Public"
+  require Pleroma.Constants
 
   @impl true
   def filter(%{"type" => "Create"} = object) do
@@ -19,8 +19,8 @@ def filter(%{"type" => "Create"} = object) do
     # Determine visibility
     visibility =
       cond do
-        @public in object["to"] -> "public"
-        @public in object["cc"] -> "unlisted"
+        Pleroma.Constants.as_public() in object["to"] -> "public"
+        Pleroma.Constants.as_public() in object["cc"] -> "unlisted"
         user.follower_address in object["to"] -> "followers"
         true -> "direct"
       end

lib/pleroma/web/activity_pub/mrf/simple_policy.ex

@@ -8,6 +8,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
   @moduledoc "Filter activities depending on their origin instance"
   @behaviour MRF
 
+  require Pleroma.Constants
+
   defp check_accept(%{host: actor_host} = _actor_info, object) do
     accepts =
       Pleroma.Config.get([:mrf_simple, :accept])
@@ -89,14 +91,10 @@ defp check_ftl_removal(%{host: actor_host} = _actor_info, object) do
     object =
       with true <- MRF.subdomain_match?(timeline_removal, actor_host),
            user <- User.get_cached_by_ap_id(object["actor"]),
-           true <- "https://www.w3.org/ns/activitystreams#Public" in object["to"] do
-        to =
-          List.delete(object["to"], "https://www.w3.org/ns/activitystreams#Public") ++
-            [user.follower_address]
-
-        cc =
-          List.delete(object["cc"], user.follower_address) ++
-            ["https://www.w3.org/ns/activitystreams#Public"]
+           true <- Pleroma.Constants.as_public() in object["to"] do
+        to = List.delete(object["to"], Pleroma.Constants.as_public()) ++ [user.follower_address]
+
+        cc = List.delete(object["cc"], user.follower_address) ++ [Pleroma.Constants.as_public()]
 
         object
         |> Map.put("to", to)

lib/pleroma/web/activity_pub/mrf/tag_policy.ex

@@ -19,7 +19,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicy do
      - `mrf_tag:disable-any-subscription`: Reject any follow requests
   """
 
-  @public "https://www.w3.org/ns/activitystreams#Public"
+  require Pleroma.Constants
 
   defp get_tags(%User{tags: tags}) when is_list(tags), do: tags
   defp get_tags(_), do: []
@@ -70,9 +70,9 @@ defp process_tag(
        ) do
     user = User.get_cached_by_ap_id(actor)
 
-    if Enum.member?(to, @public) do
-      to = List.delete(to, @public) ++ [user.follower_address]
-      cc = List.delete(cc, user.follower_address) ++ [@public]
+    if Enum.member?(to, Pleroma.Constants.as_public()) do
+      to = List.delete(to, Pleroma.Constants.as_public()) ++ [user.follower_address]
+      cc = List.delete(cc, user.follower_address) ++ [Pleroma.Constants.as_public()]
 
       object =
         object
@@ -103,9 +103,10 @@ defp process_tag(
        ) do
     user = User.get_cached_by_ap_id(actor)
 
-    if Enum.member?(to, @public) or Enum.member?(cc, @public) do
-      to = List.delete(to, @public) ++ [user.follower_address]
-      cc = List.delete(cc, @public)
+    if Enum.member?(to, Pleroma.Constants.as_public()) or
+         Enum.member?(cc, Pleroma.Constants.as_public()) do
+      to = List.delete(to, Pleroma.Constants.as_public()) ++ [user.follower_address]
+      cc = List.delete(cc, Pleroma.Constants.as_public())
 
       object =
         object

lib/pleroma/web/activity_pub/publisher.ex

@@ -11,6 +11,8 @@ defmodule Pleroma.Web.ActivityPub.Publisher do
   alias Pleroma.Web.ActivityPub.Relay
   alias Pleroma.Web.ActivityPub.Transmogrifier
 
+  require Pleroma.Constants
+
   import Pleroma.Web.ActivityPub.Visibility
 
   @behaviour Pleroma.Web.Federator.Publisher
@@ -117,8 +119,6 @@ defp get_cc_ap_ids(ap_id, recipients) do
     |> Enum.map(& &1.ap_id)
   end
 
-  @as_public "https://www.w3.org/ns/activitystreams#Public"
-
   defp maybe_use_sharedinbox(%User{info: %{source_data: data}}),
     do: (is_map(data["endpoints"]) && Map.get(data["endpoints"], "sharedInbox")) || data["inbox"]
 
@@ -145,7 +145,7 @@ def determine_inbox(
       type == "Delete" ->
         maybe_use_sharedinbox(user)
 
-      @as_public in to || @as_public in cc ->
+      Pleroma.Constants.as_public() in to || Pleroma.Constants.as_public() in cc ->
         maybe_use_sharedinbox(user)
 
       length(to) + length(cc) > 1 ->

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -19,6 +19,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   import Ecto.Query
 
   require Logger
+  require Pleroma.Constants
 
   @doc """
   Modifies an incoming AP object (mastodon format) to our internal format.
@@ -102,8 +103,7 @@ def fix_explicit_addressing(object) do
 
     follower_collection = User.get_cached_by_ap_id(Containment.get_actor(object)).follower_address
 
-    explicit_mentions =
-      explicit_mentions ++ ["https://www.w3.org/ns/activitystreams#Public", follower_collection]
+    explicit_mentions = explicit_mentions ++ [Pleroma.Constants.as_public(), follower_collection]
 
     fix_explicit_addressing(object, explicit_mentions, follower_collection)
   end
@@ -115,11 +115,11 @@ def fix_implicit_addressing(%{"to" => to, "cc" => cc} = object, followers_collec
 
     if followers_collection not in recipients do
       cond do
-        "https://www.w3.org/ns/activitystreams#Public" in cc ->
+        Pleroma.Constants.as_public() in cc ->
           to = to ++ [followers_collection]
           Map.put(object, "to", to)
 
-        "https://www.w3.org/ns/activitystreams#Public" in to ->
+        Pleroma.Constants.as_public() in to ->
           cc = cc ++ [followers_collection]
           Map.put(object, "cc", cc)
 
@@ -480,8 +480,7 @@ def handle_incoming(
          {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
          {:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
       with deny_follow_blocked <- Pleroma.Config.get([:user, :deny_follow_blocked]),
-           {_, false} <-
-             {:user_blocked, User.blocks?(followed, follower) && deny_follow_blocked},
+           {_, false} <- {:user_blocked, User.blocks?(followed, follower) && deny_follow_blocked},
            {_, false} <- {:user_locked, User.locked?(followed)},
            {_, {:ok, follower}} <- {:follow, User.follow(follower, followed)},
            {_, {:ok, _}} <-

lib/pleroma/web/activity_pub/utils.ex

@@ -18,6 +18,7 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   import Ecto.Query
 
   require Logger
+  require Pleroma.Constants
 
   @supported_object_types ["Article", "Note", "Video", "Page", "Question", "Answer"]
   @supported_report_states ~w(open closed resolved)
@@ -418,7 +419,7 @@ def make_follow_data(
       "type" => "Follow",
       "actor" => follower_id,
       "to" => [followed_id],
-      "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
+      "cc" => [Pleroma.Constants.as_public()],
       "object" => followed_id,
       "state" => "pending"
     }
@@ -510,7 +511,7 @@ def make_announce_data(
       "actor" => ap_id,
       "object" => id,
       "to" => [user.follower_address, object.data["actor"]],
-      "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
+      "cc" => [Pleroma.Constants.as_public()],
       "context" => object.data["context"]
     }
 
@@ -530,7 +531,7 @@ def make_unannounce_data(
       "actor" => ap_id,
       "object" => activity.data,
       "to" => [user.follower_address, activity.data["actor"]],
-      "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
+      "cc" => [Pleroma.Constants.as_public()],
       "context" => context
     }
 
@@ -547,7 +548,7 @@ def make_unlike_data(
       "actor" => ap_id,
       "object" => activity.data,
       "to" => [user.follower_address, activity.data["actor"]],
-      "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
+      "cc" => [Pleroma.Constants.as_public()],
       "context" => context
     }
 
@@ -556,7 +557,7 @@ def make_unlike_data(
 
   def add_announce_to_object(
         %Activity{
-          data: %{"actor" => actor, "cc" => ["https://www.w3.org/ns/activitystreams#Public"]}
+          data: %{"actor" => actor, "cc" => [Pleroma.Constants.as_public()]}
         },
         object
       ) do
@@ -765,7 +766,7 @@ defp get_updated_targets(
        ) do
     cc = Map.get(data, "cc", [])
     follower_address = User.get_cached_by_ap_id(data["actor"]).follower_address
-    public = "https://www.w3.org/ns/activitystreams#Public"
+    public = Pleroma.Constants.as_public()
 
     case visibility do
       "public" ->

lib/pleroma/web/activity_pub/visibility.ex

@@ -8,14 +8,14 @@ defmodule Pleroma.Web.ActivityPub.Visibility do
   alias Pleroma.Repo
   alias Pleroma.User
 
-  @public "https://www.w3.org/ns/activitystreams#Public"
+  require Pleroma.Constants
 
   @spec is_public?(Object.t() | Activity.t() | map()) :: boolean()
   def is_public?(%Object{data: %{"type" => "Tombstone"}}), do: false
   def is_public?(%Object{data: data}), do: is_public?(data)
   def is_public?(%Activity{data: data}), do: is_public?(data)
   def is_public?(%{"directMessage" => true}), do: false
-  def is_public?(data), do: @public in (data["to"] ++ (data["cc"] || []))
+  def is_public?(data), do: Pleroma.Constants.as_public() in (data["to"] ++ (data["cc"] || []))
 
   def is_private?(activity) do
     with false <- is_public?(activity),
@@ -73,10 +73,10 @@ def get_visibility(object) do
     cc = object.data["cc"] || []
 
     cond do
-      @public in to ->
+      Pleroma.Constants.as_public() in to ->
         "public"
 
-      @public in cc ->
+      Pleroma.Constants.as_public() in cc ->
         "unlisted"
 
       # this should use the sql for the object's activity

lib/pleroma/web/auth/authenticator.ex

@@ -21,8 +21,7 @@ def get_user(plug), do: implementation().get_user(plug)
   def create_from_registration(plug, registration),
     do: implementation().create_from_registration(plug, registration)
 
-  @callback get_registration(Plug.Conn.t()) ::
-              {:ok, Registration.t()} | {:error, any()}
+  @callback get_registration(Plug.Conn.t()) :: {:ok, Registration.t()} | {:error, any()}
   def get_registration(plug), do: implementation().get_registration(plug)
 
   @callback handle_error(Plug.Conn.t(), any()) :: any()

lib/pleroma/web/common_api/common_api.ex

@@ -300,8 +300,7 @@ def pin(id_or_ap_id, %{ap_id: user_ap_id} = user) do
            }
          } = activity <- get_by_id_or_ap_id(id_or_ap_id),
          true <- Visibility.is_public?(activity),
-         %{valid?: true} = info_changeset <-
-           User.Info.add_pinnned_activity(user.info, activity),
+         %{valid?: true} = info_changeset <- User.Info.add_pinnned_activity(user.info, activity),
          changeset <-
            Ecto.Changeset.change(user) |> Ecto.Changeset.put_embed(:info, info_changeset),
          {:ok, _user} <- User.update_and_set_cache(changeset) do

lib/pleroma/web/common_api/utils.ex

@@ -19,6 +19,7 @@ defmodule Pleroma.Web.CommonAPI.Utils do
   alias Pleroma.Web.MediaProxy
 
   require Logger
+  require Pleroma.Constants
 
   # This is a hack for twidere.
   def get_by_id_or_ap_id(id) do
@@ -66,7 +67,7 @@ def attachments_from_ids_descs(ids, descs_str) do
   @spec get_to_and_cc(User.t(), list(String.t()), Activity.t() | nil, String.t()) ::
           {list(String.t()), list(String.t())}
   def get_to_and_cc(user, mentioned_users, inReplyTo, "public") do
-    to = ["https://www.w3.org/ns/activitystreams#Public" | mentioned_users]
+    to = [Pleroma.Constants.as_public() | mentioned_users]
     cc = [user.follower_address]
 
     if inReplyTo do
@@ -78,7 +79,7 @@ def get_to_and_cc(user, mentioned_users, inReplyTo, "public") do
 
   def get_to_and_cc(user, mentioned_users, inReplyTo, "unlisted") do
     to = [user.follower_address | mentioned_users]
-    cc = ["https://www.w3.org/ns/activitystreams#Public"]
+    cc = [Pleroma.Constants.as_public()]
 
     if inReplyTo do
       {Enum.uniq([inReplyTo.data["actor"] | to]), cc}

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -49,6 +49,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   import Ecto.Query
 
   require Logger
+  require Pleroma.Constants
 
   @rate_limited_relations_actions ~w(follow unfollow)a
 
@@ -1224,10 +1225,9 @@ def user_favourites(%{assigns: %{user: for_user}} = conn, %{"id" => id} = params
 
       recipients =
         if for_user do
-          ["https://www.w3.org/ns/activitystreams#Public"] ++
-            [for_user.ap_id | for_user.following]
+          [Pleroma.Constants.as_public()] ++ [for_user.ap_id | for_user.following]
         else
-          ["https://www.w3.org/ns/activitystreams#Public"]
+          [Pleroma.Constants.as_public()]
         end
 
       activities =

lib/pleroma/web/oauth/oauth_controller.ex

@@ -365,8 +365,7 @@ def registration_details(%Plug.Conn{} = conn, %{"authorization" => auth_attrs})
   def register(%Plug.Conn{} = conn, %{"authorization" => _, "op" => "connect"} = params) do
     with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
          %Registration{} = registration <- Repo.get(Registration, registration_id),
-         {_, {:ok, auth}} <-
-           {:create_authorization, do_create_authorization(conn, params)},
+         {_, {:ok, auth}} <- {:create_authorization, do_create_authorization(conn, params)},
          %User{} = user <- Repo.preload(auth, :user).user,
          {:ok, _updated_registration} <- Registration.bind_to_user(registration, user) do
       conn

lib/pleroma/web/oauth/token.ex

@@ -44,8 +44,7 @@ def get_by_refresh_token(%App{id: app_id} = _app, token) do
     |> Repo.find_resource()
   end
 
-  @spec exchange_token(App.t(), Authorization.t()) ::
-          {:ok, Token.t()} | {:error, Changeset.t()}
+  @spec exchange_token(App.t(), Authorization.t()) :: {:ok, Token.t()} | {:error, Changeset.t()}
   def exchange_token(app, auth) do
     with {:ok, auth} <- Authorization.use_token(auth),
          true <- auth.app_id == app.id do

lib/pleroma/web/ostatus/activity_representer.ex

@@ -9,6 +9,7 @@ defmodule Pleroma.Web.OStatus.ActivityRepresenter do
   alias Pleroma.Web.OStatus.UserRepresenter
 
   require Logger
+  require Pleroma.Constants
 
   defp get_href(id) do
     with %Object{data: %{"external_url" => external_url}} <- Object.get_cached_by_ap_id(id) do
@@ -34,7 +35,7 @@ defp get_mentions(to) do
     Enum.map(to, fn id ->
       cond do
         # Special handling for the AP/Ostatus public collections
-        "https://www.w3.org/ns/activitystreams#Public" == id ->
+        Pleroma.Constants.as_public() == id ->
           {:link,
            [
              rel: "mentioned",