Add unfollowing to TwAPI.

lib/pleroma/user.ex

@@ -43,4 +43,14 @@ defmodule Pleroma.User do
     |> follow_changeset(%{following: following})
     |> Repo.update
   end
+
+  def unfollow(%User{} = follower, %User{} = followed) do
+    ap_followers = User.ap_followers(followed)
+    following = follower.following
+    |> List.delete(ap_followers)
+
+    follower
+    |> follow_changeset(%{following: following})
+    |> Repo.update
+  end
 end

lib/pleroma/web/router.ex

@@ -32,5 +32,6 @@ defmodule Pleroma.Web.Router do
     post "/statuses/update.json", TwitterAPI.Controller, :status_update
     get "/statuses/friends_timeline.json", TwitterAPI.Controller, :friends_timeline
     post "/friendships/create.json", TwitterAPI.Controller, :follow
+    post "/friendships/destroy.json", TwitterAPI.Controller, :unfollow
   end
 end

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -42,6 +42,14 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
     end
   end
 
+  def unfollow(%User{} = follower, followed_id) do
+    with %User{} = followed <- Repo.get(User, followed_id),
+         { :ok, follower } <- User.unfollow(follower, followed)
+    do
+      { :ok, follower, followed }
+    end
+  end
+
   defp activities_to_statuses(activities) do
     Enum.map(activities, fn(activity) ->
       actor = get_in(activity.data, ["actor"])

lib/pleroma/web/twitter_api/twitter_api_controller.ex

@@ -41,6 +41,16 @@ defmodule Pleroma.Web.TwitterAPI.Controller do
     |> json_reply(200, response)
   end
 
+  def unfollow(%{assigns: %{user: user}} = conn, %{ "user_id" => followed_id }) do
+    { :ok, _user, follower } = TwitterAPI.unfollow(user, followed_id)
+
+    response = follower |> UserRepresenter.to_json
+
+    conn
+    |> json_reply(200, response)
+  end
+
+
   defp json_reply(conn, status, json) do
     conn
     |> put_resp_content_type("application/json")