WIP: List all the single-codepoint unicode emojis

lib/pleroma/web/api_spec/operations/emoji_reaction_operation.ex

@@ -77,6 +77,17 @@ def delete_operation do
     }
   end
 
+  def emoji_reactions_operation do
+    %Operation{
+      tags: ["Emoji Reactions"],
+      summary: "List emoji reactions recognized by the server",
+      operationId: "EmojiReactionController.emoji_reactions",
+      responses: %{
+        200 => emoji_reactions_response()
+      }
+    }
+  end
+
   defp array_of_reactions_response do
     Operation.response("Array of Emoji Reactions", "application/json", %Schema{
       type: :array,
@@ -85,6 +96,13 @@ defp array_of_reactions_response do
     })
   end
 
+  defp emoji_reactions_response do
+    Operation.response("List of emojis by their names", "application/json", %Schema{
+      type: :object,
+      example: %{"cookie" => "🍪", "umbrella" => "☂"}
+    })
+  end
+
   defp emoji_reaction do
     %Schema{
       title: "EmojiReaction",

lib/pleroma/web/pleroma_api/controllers/emoji_reaction_controller.ex

@@ -91,4 +91,23 @@ def delete(%{assigns: %{user: user}} = conn, %{id: activity_id, emoji: emoji}) d
       |> render("show.json", activity: activity, for: user, as: :activity)
     end
   end
+
+  @external_resource "lib/pleroma/web/pleroma_api/controllers/emoji.json"
+
+  @reactions_json File.read!(@external_resource)
+                  |> Jason.decode!()
+                  |> Enum.reduce(%{}, fn {name, codepoint}, acc ->
+                    Map.put(
+                      acc,
+                      String.downcase(name),
+                      [codepoint |> String.to_integer(16)] |> String.Chars.to_string()
+                    )
+                  end)
+                  |> Jason.encode!()
+
+  def emoji_reactions(conn, _params) do
+    conn
+    |> put_resp_content_type("application/json")
+    |> send_resp(200, @reactions_json)
+  end
 end

lib/pleroma/web/router.ex

@@ -348,6 +348,7 @@ defmodule Pleroma.Web.Router do
   scope "/api/v1/pleroma", Pleroma.Web.PleromaAPI do
     pipe_through(:api)
 
+    get("/emoji_reactions", EmojiReactionController, :emoji_reactions)
     get("/statuses/:id/reactions/:emoji", EmojiReactionController, :index)
     get("/statuses/:id/reactions", EmojiReactionController, :index)
   end

test/pleroma/web/pleroma_api/controllers/emoji_reaction_controller_test.exs

@@ -188,4 +188,16 @@ test "GET /api/v1/pleroma/statuses/:id/reactions/:emoji", %{conn: conn} do
 
     assert represented_user["id"] == other_user.id
   end
+
+  describe "/api/v1/pleroma/emoji_reactions" do
+    test "returns json with unicode emojis", %{conn: conn} do
+      emoji =
+        conn
+        |> get("/api/v1/pleroma/emoji_reactions")
+        |> json_response(200)
+
+      assert emoji["cookie"] == "🍪"
+      assert Enum.count(emoji) == 1367
+    end
+  end
 end