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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.TwitterAPI.RemoteFollowControllerTest do
+  use Pleroma.Web.ConnCase
+
+  alias Pleroma.Config
+  alias Pleroma.MFA
+  alias Pleroma.MFA.TOTP
+  alias Pleroma.User
+  alias Pleroma.Web.CommonAPI
+
+  import ExUnit.CaptureLog
+  import Pleroma.Factory
+  import Ecto.Query
+
+  setup do
+    Tesla.Mock.mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
+    :ok
+  end
+
+  setup_all do: clear_config([:instance, :federating], true)
+  setup do: clear_config([:instance])
+  setup do: clear_config([:frontend_configurations, :pleroma_fe])
+  setup do: clear_config([:user, :deny_follow_blocked])
+
+  describe "GET /ostatus_subscribe - remote_follow/2" do
+    test "adds status to pleroma instance if the `acct` is a status", %{conn: conn} do
+      assert conn
+             |> get(
+               remote_follow_path(conn, :follow, %{
+                 acct: "https://mastodon.social/users/emelie/statuses/101849165031453009"
+               })
+             )
+             |> redirected_to() =~ "/notice/"
+    end
+
+    test "show follow account page if the `acct` is a account link", %{conn: conn} do
+      response =
+        conn
+        |> get(remote_follow_path(conn, :follow, %{acct: "https://mastodon.social/users/emelie"}))
+        |> html_response(200)
+
+      assert response =~ "Log in to follow"
+    end
+
+    test "show follow page if the `acct` is a account link", %{conn: conn} do
+      user = insert(:user)
+
+      response =
+        conn
+        |> assign(:user, user)
+        |> get(remote_follow_path(conn, :follow, %{acct: "https://mastodon.social/users/emelie"}))
+        |> html_response(200)
+
+      assert response =~ "Remote follow"
+    end
+
+    test "show follow page with error when user cannot fecth by `acct` link", %{conn: conn} do
+      user = insert(:user)
+
+      assert capture_log(fn ->
+               response =
+                 conn
+                 |> assign(:user, user)
+                 |> get(
+                   remote_follow_path(conn, :follow, %{
+                     acct: "https://mastodon.social/users/not_found"
+                   })
+                 )
+                 |> html_response(200)
+
+               assert response =~ "Error fetching user"
+             end) =~ "Object has been deleted"
+    end
+  end
+
+  describe "POST /ostatus_subscribe - do_follow/2 with assigned user " do
+    test "required `follow | write:follows` scope", %{conn: conn} do
+      user = insert(:user)
+      user2 = insert(:user)
+      read_token = insert(:oauth_token, user: user, scopes: ["read"])
+
+      assert capture_log(fn ->
+               response =
+                 conn
+                 |> assign(:user, user)
+                 |> assign(:token, read_token)
+                 |> post(remote_follow_path(conn, :do_follow), %{"user" => %{"id" => user2.id}})
+                 |> response(200)
+
+               assert response =~ "Error following account"
+             end) =~ "Insufficient permissions: follow | write:follows."
+    end
+
+    test "follows user", %{conn: conn} do
+      user = insert(:user)
+      user2 = insert(:user)
+
+      conn =
+        conn
+        |> assign(:user, user)
+        |> assign(:token, insert(:oauth_token, user: user, scopes: ["write:follows"]))
+        |> post(remote_follow_path(conn, :do_follow), %{"user" => %{"id" => user2.id}})
+
+      assert redirected_to(conn) == "/users/#{user2.id}"
+    end
+
+    test "returns error when user is deactivated", %{conn: conn} do
+      user = insert(:user, deactivated: true)
+      user2 = insert(:user)
+
+      response =
+        conn
+        |> assign(:user, user)
+        |> post(remote_follow_path(conn, :do_follow), %{"user" => %{"id" => user2.id}})
+        |> response(200)
+
+      assert response =~ "Error following account"
+    end
+
+    test "returns error when user is blocked", %{conn: conn} do
+      Pleroma.Config.put([:user, :deny_follow_blocked], true)
+      user = insert(:user)
+      user2 = insert(:user)
+
+      {:ok, _user_block} = Pleroma.User.block(user2, user)
+
+      response =
+        conn
+        |> assign(:user, user)
+        |> post(remote_follow_path(conn, :do_follow), %{"user" => %{"id" => user2.id}})
+        |> response(200)
+
+      assert response =~ "Error following account"
+    end
+
+    test "returns error when followee not found", %{conn: conn} do
+      user = insert(:user)
+
+      response =
+        conn
+        |> assign(:user, user)
+        |> post(remote_follow_path(conn, :do_follow), %{"user" => %{"id" => "jimm"}})
+        |> response(200)
+
+      assert response =~ "Error following account"
+    end
+
+    test "returns success result when user already in followers", %{conn: conn} do
+      user = insert(:user)
+      user2 = insert(:user)
+      {:ok, _, _, _} = CommonAPI.follow(user, user2)
+
+      conn =
+        conn
+        |> assign(:user, refresh_record(user))
+        |> assign(:token, insert(:oauth_token, user: user, scopes: ["write:follows"]))
+        |> post(remote_follow_path(conn, :do_follow), %{"user" => %{"id" => user2.id}})
+
+      assert redirected_to(conn) == "/users/#{user2.id}"
+    end
+  end
+
+  describe "POST /ostatus_subscribe - follow/2 with enabled Two-Factor Auth " do
+    test "render the MFA login form", %{conn: conn} do
+      otp_secret = TOTP.generate_secret()
+
+      user =
+        insert(:user,
+          multi_factor_authentication_settings: %MFA.Settings{
+            enabled: true,
+            totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+          }
+        )
+
+      user2 = insert(:user)
+
+      response =
+        conn
+        |> post(remote_follow_path(conn, :do_follow), %{
+          "authorization" => %{"name" => user.nickname, "password" => "test", "id" => user2.id}
+        })
+        |> response(200)
+
+      mfa_token = Pleroma.Repo.one(from(q in Pleroma.MFA.Token, where: q.user_id == ^user.id))
+
+      assert response =~ "Two-factor authentication"
+      assert response =~ "Authentication code"
+      assert response =~ mfa_token.token
+      refute user2.follower_address in User.following(user)
+    end
+
+    test "returns error when password is incorrect", %{conn: conn} do
+      otp_secret = TOTP.generate_secret()
+
+      user =
+        insert(:user,
+          multi_factor_authentication_settings: %MFA.Settings{
+            enabled: true,
+            totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+          }
+        )
+
+      user2 = insert(:user)
+
+      response =
+        conn
+        |> post(remote_follow_path(conn, :do_follow), %{
+          "authorization" => %{"name" => user.nickname, "password" => "test1", "id" => user2.id}
+        })
+        |> response(200)
+
+      assert response =~ "Wrong username or password"
+      refute user2.follower_address in User.following(user)
+    end
+
+    test "follows", %{conn: conn} do
+      otp_secret = TOTP.generate_secret()
+
+      user =
+        insert(:user,
+          multi_factor_authentication_settings: %MFA.Settings{
+            enabled: true,
+            totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+          }
+        )
+
+      {:ok, %{token: token}} = MFA.Token.create(user)
+
+      user2 = insert(:user)
+      otp_token = TOTP.generate_token(otp_secret)
+
+      conn =
+        conn
+        |> post(
+          remote_follow_path(conn, :do_follow),
+          %{
+            "mfa" => %{"code" => otp_token, "token" => token, "id" => user2.id}
+          }
+        )
+
+      assert redirected_to(conn) == "/users/#{user2.id}"
+      assert user2.follower_address in User.following(user)
+    end
+
+    test "returns error when auth code is incorrect", %{conn: conn} do
+      otp_secret = TOTP.generate_secret()
+
+      user =
+        insert(:user,
+          multi_factor_authentication_settings: %MFA.Settings{
+            enabled: true,
+            totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+          }
+        )
+
+      {:ok, %{token: token}} = MFA.Token.create(user)
+
+      user2 = insert(:user)
+      otp_token = TOTP.generate_token(TOTP.generate_secret())
+
+      response =
+        conn
+        |> post(
+          remote_follow_path(conn, :do_follow),
+          %{
+            "mfa" => %{"code" => otp_token, "token" => token, "id" => user2.id}
+          }
+        )
+        |> response(200)
+
+      assert response =~ "Wrong authentication code"
+      refute user2.follower_address in User.following(user)
+    end
+  end
+
+  describe "POST /ostatus_subscribe - follow/2 without assigned user " do
+    test "follows", %{conn: conn} do
+      user = insert(:user)
+      user2 = insert(:user)
+
+      conn =
+        conn
+        |> post(remote_follow_path(conn, :do_follow), %{
+          "authorization" => %{"name" => user.nickname, "password" => "test", "id" => user2.id}
+        })
+
+      assert redirected_to(conn) == "/users/#{user2.id}"
+      assert user2.follower_address in User.following(user)
+    end
+
+    test "returns error when followee not found", %{conn: conn} do
+      user = insert(:user)
+
+      response =
+        conn
+        |> post(remote_follow_path(conn, :do_follow), %{
+          "authorization" => %{"name" => user.nickname, "password" => "test", "id" => "jimm"}
+        })
+        |> response(200)
+
+      assert response =~ "Error following account"
+    end
+
+    test "returns error when login invalid", %{conn: conn} do
+      user = insert(:user)
+
+      response =
+        conn
+        |> post(remote_follow_path(conn, :do_follow), %{
+          "authorization" => %{"name" => "jimm", "password" => "test", "id" => user.id}
+        })
+        |> response(200)
+
+      assert response =~ "Wrong username or password"
+    end
+
+    test "returns error when password invalid", %{conn: conn} do
+      user = insert(:user)
+      user2 = insert(:user)
+
+      response =
+        conn
+        |> post(remote_follow_path(conn, :do_follow), %{
+          "authorization" => %{"name" => user.nickname, "password" => "42", "id" => user2.id}
+        })
+        |> response(200)
+
+      assert response =~ "Wrong username or password"
+    end
+
+    test "returns error when user is blocked", %{conn: conn} do
+      Pleroma.Config.put([:user, :deny_follow_blocked], true)
+      user = insert(:user)
+      user2 = insert(:user)
+      {:ok, _user_block} = Pleroma.User.block(user2, user)
+
+      response =
+        conn
+        |> post(remote_follow_path(conn, :do_follow), %{
+          "authorization" => %{"name" => user.nickname, "password" => "test", "id" => user2.id}
+        })
+        |> response(200)
+
+      assert response =~ "Error following account"
+    end
+  end
+end