Make tag urls absolute

CHANGELOG.md

@@ -54,6 +54,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Streaming API: Posts and notifications are not dropped, when CLI task is executing.
 - Creating incorrect IPv4 address-style HTTP links when encountering certain numbers.
 - Reblog API Endpoint: Do not set visibility parameter to public by default and let CommonAPI to infer it from status, so a user can reblog their private status without explicitly setting reblog visibility to private.
+- Tag URLs in statuses are now absolute
 
 <details>
   <summary>API Changes</summary>

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -491,7 +491,7 @@ def render_content(object), do: object.data["content"] || ""
   def build_tags(object_tags) when is_list(object_tags) do
     object_tags
     |> Enum.filter(&is_binary/1)
-    |> Enum.map(&%{name: &1, url: "/tag/#{URI.encode(&1)}"})
+    |> Enum.map(&%{name: &1, url: "#{Pleroma.Web.base_url()}/tag/#{URI.encode(&1)}"})
   end
 
   def build_tags(_), do: []

test/pleroma/web/mastodon_api/views/status_view_test.exs

@@ -263,7 +263,7 @@ test "a note activity" do
       tags: [
         %{
           name: "#{object_data["tag"]}",
-          url: "/tag/#{object_data["tag"]}"
+          url: "http://localhost:4001/tag/#{object_data["tag"]}"
         }
       ],
       application: %{
@@ -585,9 +585,9 @@ test "it returns a a dictionary tags" do
       ]
 
       assert StatusView.build_tags(object_tags) == [
-               %{name: "fediverse", url: "/tag/fediverse"},
-               %{name: "mastodon", url: "/tag/mastodon"},
-               %{name: "nextcloud", url: "/tag/nextcloud"}
+               %{name: "fediverse", url: "http://localhost:4001/tag/fediverse"},
+               %{name: "mastodon", url: "http://localhost:4001/tag/mastodon"},
+               %{name: "nextcloud", url: "http://localhost:4001/tag/nextcloud"}
              ]
     end
   end