Add frontend preference route

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

@@ -0,0 +1,62 @@
+defmodule Pleroma.Web.ApiSpec.PleromaFrontendSettingsOperation do
+  alias OpenApiSpex.Operation
+  alias OpenApiSpex.Schema
+  import Pleroma.Web.ApiSpec.Helpers
+
+  @spec open_api_operation(atom) :: Operation.t()
+  def open_api_operation(action) do
+    operation = String.to_existing_atom("#{action}_operation")
+    apply(__MODULE__, operation, [])
+  end
+
+  def available_frontends_operation() do
+    %Operation{
+      tags: ["Frontends"],
+      summary: "Frontend Settings Profiles",
+      description: "List frontend setting profiles",
+      operationId: "PleromaAPI.FrontendSettingsController.available_frontends",
+      responses: %{
+        200 =>
+          Operation.response("Frontends", "application/json", %Schema{
+            type: :array,
+            items: %Schema{
+              type: :string
+            }
+          })
+      }
+    }
+  end
+
+  def update_preferred_frontend_operation() do
+    %Operation{
+      tags: ["Frontends"],
+      summary: "Frontend Settings Profiles",
+      description: "List frontend setting profiles",
+      operationId: "PleromaAPI.FrontendSettingsController.available_frontends",
+      requestBody:
+        request_body(
+          "Frontend",
+          %Schema{
+            type: :object,
+            required: [:frontend_name],
+            properties: %{
+              frontend_name: %Schema{
+                type: :string,
+                description: "Frontend name"
+              }
+            }
+          },
+          required: true
+        ),
+      responses: %{
+        200 =>
+          Operation.response("Frontends", "application/json", %Schema{
+            type: :array,
+            items: %Schema{
+              type: :string
+            }
+          })
+      }
+    }
+  end
+end

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

@@ -0,0 +1,37 @@
+defmodule Pleroma.Web.PleromaAPI.FrontendSettingsController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.Web.Plugs.OAuthScopesPlug
+
+  plug(
+    OAuthScopesPlug,
+    %{fallback: :proceed_unauthenticated, scopes: []}
+    when action in [
+           :available_frontends,
+           :update_preferred_frontend
+         ]
+  )
+
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
+  defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.PleromaFrontendSettingsOperation
+
+  action_fallback(Pleroma.Web.MastodonAPI.FallbackController)
+
+  @doc "GET /api/v1/pleroma/preferred_frontend/available"
+  def available_frontends(conn, _params) do
+    available = Pleroma.Config.get([:frontends, :pickable])
+
+    conn
+    |> json(available)
+  end
+
+  @doc "PUT /api/v1/pleroma/preferred_frontend"
+  def update_preferred_frontend(
+        %{body_params: %{frontend_name: preferred_frontend}} = conn,
+        _params
+      ) do
+    conn
+    |> put_resp_cookie("preferred_frontend", preferred_frontend)
+    |> json(%{frontend_name: preferred_frontend})
+  end
+end

lib/pleroma/web/router.ex

@@ -561,6 +561,18 @@ defmodule Pleroma.Web.Router do
     get("/apps", AppController, :index)
     get("/statuses/:id/reactions/:emoji", EmojiReactionController, :index)
     get("/statuses/:id/reactions", EmojiReactionController, :index)
+
+    get(
+      "/preferred_frontend/available",
+      FrontendSettingsController,
+      :available_frontends
+    )
+
+    put(
+      "/preferred_frontend",
+      FrontendSettingsController,
+      :update_preferred_frontend
+    )
   end
 
   scope "/api/v0/pleroma", Pleroma.Web.PleromaAPI do