From cd5fb84b76a51fe6c7b5d672298a87c34737c303 Mon Sep 17 00:00:00 2001
From: =?utf8?q?marcin=20miko=C5=82ajczak?= <git@mkljczk.pl>
Date: Mon, 22 Nov 2021 19:44:30 +0100
Subject: [PATCH 1/1] remote_interaction API endpoint
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Signed-off-by: marcin mikołajczak <git@mkljczk.pl>
---
 .../operations/twitter_util_operation.ex      | 26 +++++++++++++++++++
 lib/pleroma/web/router.ex                     |  1 +
 .../controllers/util_controller.ex            |  9 +++++++
 3 files changed, 36 insertions(+)

diff --git a/lib/pleroma/web/api_spec/operations/twitter_util_operation.ex b/lib/pleroma/web/api_spec/operations/twitter_util_operation.ex
index ebcfd3be2..1a2dbb166 100644
--- a/lib/pleroma/web/api_spec/operations/twitter_util_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/twitter_util_operation.ex
@@ -237,4 +237,30 @@ defmodule Pleroma.Web.ApiSpec.TwitterUtilOperation do
       responses: %{200 => Operation.response("Web Page", "test/html", %Schema{type: :string})}
     }
   end
+
+  def remote_interaction_operation do
+    %Operation{
+      tags: ["Accounts"],
+      summary: "Remote interaction",
+      operationId: "UtilController.remote_interaction",
+      requestBody: request_body("Parameters", remote_interaction_request(), required: true),
+      responses: %{
+        200 =>
+          Operation.response("Remote interaction URL", "application/json", %Schema{type: :object})
+      }
+    }
+  end
+
+  defp remote_interaction_request do
+    %Schema{
+      title: "RemoteInteractionRequest",
+      description: "POST body for remote interaction",
+      type: :object,
+      required: [:ap_id, :profile],
+      properties: %{
+        ap_id: %Schema{type: :string, description: "Profile or status ActivityPub ID"},
+        profile: %Schema{type: :string, description: "Remote profile webfinger"}
+      }
+    }
+  end
 end
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index abb332ec2..f8bafd3c2 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -150,6 +150,7 @@ defmodule Pleroma.Web.Router do
     get("/emoji", UtilController, :emoji)
     get("/captcha", UtilController, :captcha)
     get("/healthcheck", UtilController, :healthcheck)
+    post("/remote_interaction", UtilController, :remote_interaction)
   end
 
   scope "/api/v1/pleroma", Pleroma.Web do
diff --git a/lib/pleroma/web/twitter_api/controllers/util_controller.ex b/lib/pleroma/web/twitter_api/controllers/util_controller.ex
index ef43f7682..cbcef7475 100644
--- a/lib/pleroma/web/twitter_api/controllers/util_controller.ex
+++ b/lib/pleroma/web/twitter_api/controllers/util_controller.ex
@@ -62,6 +62,15 @@ defmodule Pleroma.Web.TwitterAPI.UtilController do
     end
   end
 
+  def remote_interaction(%{body_params: %{ap_id: ap_id, profile: profile}} = conn, _params) do
+    with {:ok, %{"subscribe_address" => template}} <- WebFinger.finger(profile) do
+      conn
+      |> json(%{url: String.replace(template, "{uri}", ap_id)})
+    else
+      _e -> json(conn, %{error: "Couldn't find user"})
+    end
+  end
+
   def frontend_configurations(conn, _params) do
     render(conn, "frontend_configurations.json")
   end
-- 
2.45.2