implement Move activities (#45)

Reviewed-on: https://akkoma.dev/AkkomaGang/akkoma/pulls/45
Co-authored-by: sfr <sol@solfisher.com>
Co-committed-by: sfr <sol@solfisher.com>

CHANGELOG.md

@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Added
+- Added move account API
+
 ### Removed
 - SSH frontend, to be potentially re-enabled via a bridge rather than wired into the main system
 - Gopher frontend, as above

docs/development/API/pleroma_api.md

@@ -342,6 +342,36 @@ See [Admin-API](admin_api.md)
 * Response: JSON. Returns `{"status": "success"}` if the change was successful, `{"error": "[error message]"}` otherwise
 * Note: Currently, Mastodon has no API for changing email. If they add it in future it might be incompatible with Pleroma.
 
+## `/api/pleroma/move_account`
+### Move account
+* Method `POST`
+* Authentication: required
+* Params:
+    * `password`: user's password
+    * `target_account`: the nickname of the target account (e.g. `foo@example.org`)
+* Response: JSON. Returns `{"status": "success"}` if the change was successful, `{"error": "[error message]"}` otherwise
+* Note: This endpoint emits a `Move` activity to all followers of the current account. Some remote servers will automatically unfollow the current account and follow the target account upon seeing this, but this depends on the remote server implementation and cannot be guaranteed. For local followers , they will automatically unfollow and follow if and only if they have set the `allow_following_move` preference ("Allow auto-follow when following account moves").
+
+## `/api/pleroma/aliases`
+### Get aliases of the current account
+* Method `GET`
+* Authentication: required
+* Response: JSON. Returns `{"aliases": [alias, ...]}`, where `alias` is the nickname of an alias, e.g. `foo@example.org`.
+
+### Add alias to the current account
+* Method `PUT`
+* Authentication: required
+* Params:
+    * `alias`: the nickname of the alias to add, e.g. `foo@example.org`.
+* Response: JSON. Returns `{"status": "success"}` if the change was successful, `{"error": "[error message]"}` otherwise
+
+### Delete alias from the current account
+* Method `DELETE`
+* Authentication: required
+* Params:
+    * `alias`: the nickname of the alias to delete, e.g. `foo@example.org`.
+* Response: JSON. Returns `{"status": "success"}` if the change was successful, `{"error": "[error message]"}` otherwise
+
 # Pleroma Conversations
 
 Pleroma Conversations have the same general structure that Mastodon Conversations have. The behavior differs in the following ways when using these endpoints:

lib/pleroma/following_relationship.ex

@@ -194,12 +194,13 @@ defmodule Pleroma.FollowingRelationship do
     |> join(:inner, [r], f in assoc(r, :follower))
     |> where(following_id: ^origin.id)
     |> where([r, f], f.allow_following_move == true)
+    |> where([r, f], f.local == true)
     |> limit(50)
     |> preload([:follower])
     |> Repo.all()
     |> Enum.map(fn following_relationship ->
-      Repo.delete(following_relationship)
       Pleroma.Web.CommonAPI.follow(following_relationship.follower, target)
+      Pleroma.Web.CommonAPI.unfollow(following_relationship.follower, origin)
     end)
     |> case do
       [] ->

lib/pleroma/user.ex

@@ -2288,6 +2288,38 @@ defmodule Pleroma.User do
     |> update_and_set_cache()
   end
 
+  def alias_users(user) do
+    user.also_known_as
+    |> Enum.map(&User.get_cached_by_ap_id/1)
+    |> Enum.filter(fn user -> user != nil end)
+  end
+
+  def add_alias(user, new_alias_user) do
+    current_aliases = user.also_known_as || []
+    new_alias_ap_id = new_alias_user.ap_id
+
+    if new_alias_ap_id in current_aliases do
+      {:ok, user}
+    else
+      user
+      |> cast(%{also_known_as: current_aliases ++ [new_alias_ap_id]}, [:also_known_as])
+      |> update_and_set_cache()
+    end
+  end
+
+  def delete_alias(user, alias_user) do
+    current_aliases = user.also_known_as || []
+    alias_ap_id = alias_user.ap_id
+
+    if alias_ap_id in current_aliases do
+      user
+      |> cast(%{also_known_as: current_aliases -- [alias_ap_id]}, [:also_known_as])
+      |> update_and_set_cache()
+    else
+      {:error, :no_such_alias}
+    end
+  end
+
   # Internal function; public one is `deactivate/2`
   defp set_activation_status(user, status) do
     user

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -417,7 +417,8 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
       "type" => "Move",
       "actor" => origin.ap_id,
       "object" => origin.ap_id,
-      "target" => target.ap_id
+      "target" => target.ap_id,
+      "to" => [origin.follower_address]
     }
 
     with true <- origin.ap_id in target.also_known_as,

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

@@ -214,6 +214,146 @@ defmodule Pleroma.Web.ApiSpec.TwitterUtilOperation do
     }
   end
 
+  def move_account_operation do
+    %Operation{
+      tags: ["Account credentials"],
+      summary: "Move account",
+      security: [%{"oAuth" => ["write:accounts"]}],
+      operationId: "UtilController.move_account",
+      requestBody: request_body("Parameters", move_account_request(), required: true),
+      responses: %{
+        200 =>
+          Operation.response("Success", "application/json", %Schema{
+            type: :object,
+            properties: %{status: %Schema{type: :string, example: "success"}}
+          }),
+        400 => Operation.response("Error", "application/json", ApiError),
+        403 => Operation.response("Error", "application/json", ApiError),
+        404 => Operation.response("Error", "application/json", ApiError)
+      }
+    }
+  end
+
+  defp move_account_request do
+    %Schema{
+      title: "MoveAccountRequest",
+      description: "POST body for moving the account",
+      type: :object,
+      required: [:password, :target_account],
+      properties: %{
+        password: %Schema{type: :string, description: "Current password"},
+        target_account: %Schema{
+          type: :string,
+          description: "The nickname of the target account to move to"
+        }
+      }
+    }
+  end
+
+  def list_aliases_operation do
+    %Operation{
+      tags: ["Account credentials"],
+      summary: "List account aliases",
+      security: [%{"oAuth" => ["read:accounts"]}],
+      operationId: "UtilController.list_aliases",
+      responses: %{
+        200 =>
+          Operation.response("Success", "application/json", %Schema{
+            type: :object,
+            properties: %{
+              aliases: %Schema{
+                type: :array,
+                items: %Schema{type: :string},
+                example: ["foo@example.org"]
+              }
+            }
+          }),
+        400 => Operation.response("Error", "application/json", ApiError),
+        403 => Operation.response("Error", "application/json", ApiError)
+      }
+    }
+  end
+
+  def add_alias_operation do
+    %Operation{
+      tags: ["Account credentials"],
+      summary: "Add an alias to this account",
+      security: [%{"oAuth" => ["write:accounts"]}],
+      operationId: "UtilController.add_alias",
+      requestBody: request_body("Parameters", add_alias_request(), required: true),
+      responses: %{
+        200 =>
+          Operation.response("Success", "application/json", %Schema{
+            type: :object,
+            properties: %{
+              status: %Schema{
+                type: :string,
+                example: "success"
+              }
+            }
+          }),
+        400 => Operation.response("Error", "application/json", ApiError),
+        403 => Operation.response("Error", "application/json", ApiError),
+        404 => Operation.response("Error", "application/json", ApiError)
+      }
+    }
+  end
+
+  defp add_alias_request do
+    %Schema{
+      title: "AddAliasRequest",
+      description: "PUT body for adding aliases",
+      type: :object,
+      required: [:alias],
+      properties: %{
+        alias: %Schema{
+          type: :string,
+          description: "The nickname of the account to add to aliases"
+        }
+      }
+    }
+  end
+
+  def delete_alias_operation do
+    %Operation{
+      tags: ["Account credentials"],
+      summary: "Delete an alias from this account",
+      security: [%{"oAuth" => ["write:accounts"]}],
+      operationId: "UtilController.delete_alias",
+      requestBody: request_body("Parameters", delete_alias_request(), required: true),
+      responses: %{
+        200 =>
+          Operation.response("Success", "application/json", %Schema{
+            type: :object,
+            properties: %{
+              status: %Schema{
+                type: :string,
+                example: "success"
+              }
+            }
+          }),
+        400 => Operation.response("Error", "application/json", ApiError),
+        403 => Operation.response("Error", "application/json", ApiError),
+        404 => Operation.response("Error", "application/json", ApiError)
+      }
+    }
+  end
+
+  defp delete_alias_request do
+    %Schema{
+      title: "DeleteAliasRequest",
+      description: "PUT body for deleting aliases",
+      type: :object,
+      required: [:alias],
+      properties: %{
+        alias: %Schema{
+          type: :string,
+          description: "The nickname of the account to delete from aliases"
+        }
+      }
+    }
+  end
+
   def healthcheck_operation do
     %Operation{
       tags: ["Accounts"],

lib/pleroma/web/router.ex

@@ -349,6 +349,11 @@ defmodule Pleroma.Web.Router do
     post("/delete_account", UtilController, :delete_account)
     put("/notification_settings", UtilController, :update_notificaton_settings)
     post("/disable_account", UtilController, :disable_account)
+    post("/move_account", UtilController, :move_account)
+
+    put("/aliases", UtilController, :add_alias)
+    get("/aliases", UtilController, :list_aliases)
+    delete("/aliases", UtilController, :delete_alias)
   end
 
   scope "/api/pleroma", Pleroma.Web.PleromaAPI do

lib/pleroma/web/twitter_api/controllers/util_controller.ex

@@ -11,6 +11,7 @@ defmodule Pleroma.Web.TwitterAPI.UtilController do
   alias Pleroma.Emoji
   alias Pleroma.Healthcheck
   alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.CommonAPI
   alias Pleroma.Web.Plugs.OAuthScopesPlug
   alias Pleroma.Web.WebFinger
@@ -26,7 +27,18 @@ defmodule Pleroma.Web.TwitterAPI.UtilController do
            :change_password,
            :delete_account,
            :update_notificaton_settings,
-           :disable_account
+           :disable_account,
+           :move_account,
+           :add_alias,
+           :delete_alias
+         ]
+  )
+
+  plug(
+    OAuthScopesPlug,
+    %{scopes: ["read:accounts"]}
+    when action in [
+           :list_aliases
          ]
   )
 
@@ -158,6 +170,91 @@ defmodule Pleroma.Web.TwitterAPI.UtilController do
     end
   end
 
+  def move_account(%{assigns: %{user: user}, body_params: body_params} = conn, %{}) do
+    case CommonAPI.Utils.confirm_current_password(user, body_params.password) do
+      {:ok, user} ->
+        with {:ok, target_user} <- find_or_fetch_user_by_nickname(body_params.target_account),
+             {:ok, _user} <- ActivityPub.move(user, target_user) do
+          json(conn, %{status: "success"})
+        else
+          {:not_found, _} ->
+            conn
+            |> put_status(404)
+            |> json(%{error: "Target account not found."})
+
+          {:error, error} ->
+            json(conn, %{error: error})
+        end
+
+      {:error, msg} ->
+        json(conn, %{error: msg})
+    end
+  end
+
+  def add_alias(%{assigns: %{user: user}, body_params: body_params} = conn, _) do
+    with {:ok, alias_user} <- find_user_by_nickname(body_params.alias),
+         {:ok, _user} <- user |> User.add_alias(alias_user) do
+      json(conn, %{status: "success"})
+    else
+      {:not_found, _} ->
+        conn
+        |> put_status(404)
+        |> json(%{error: "Target account does not exist."})
+
+      {:error, error} ->
+        json(conn, %{error: error})
+    end
+  end
+
+  def delete_alias(%{assigns: %{user: user}, body_params: body_params} = conn, _) do
+    with {:ok, alias_user} <- find_user_by_nickname(body_params.alias),
+         {:ok, _user} <- user |> User.delete_alias(alias_user) do
+      json(conn, %{status: "success"})
+    else
+      {:error, :no_such_alias} ->
+        conn
+        |> put_status(404)
+        |> json(%{error: "Account has no such alias."})
+
+      {:error, error} ->
+        json(conn, %{error: error})
+    end
+  end
+
+  def list_aliases(%{assigns: %{user: user}} = conn, %{}) do
+    alias_nicks =
+      user
+      |> User.alias_users()
+      |> Enum.map(&User.full_nickname/1)
+
+    json(conn, %{aliases: alias_nicks})
+  end
+
+  defp find_user_by_nickname(nickname) do
+    user = User.get_cached_by_nickname(nickname)
+
+    if user == nil do
+      {:not_found, nil}
+    else
+      {:ok, user}
+    end
+  end
+
+  defp find_or_fetch_user_by_nickname(nickname) do
+    user = User.get_by_nickname(nickname)
+
+    if user != nil and user.local do
+      {:ok, user}
+    else
+      with {:ok, user} <- User.fetch_by_nickname(nickname) do
+        {:ok, user}
+      else
+        _ ->
+          {:not_found, nil}
+      end
+    end
+  end
+
   def captcha(conn, _params) do
     json(conn, Pleroma.Captcha.new())
   end

test/fixtures/tesla_mock/https___lm.kazv.moe_users_mewmew.xml

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0"><Subject>acct:mewmew@lm.kazv.moe</Subject><Alias>https://lm.kazv.moe/users/mewmew</Alias><Alias>https://lm.kazv.moe/users/tester</Alias><Alias>https://lm.kazv.moe/users/testuser</Alias><Link href="https://lm.kazv.moe/users/mewmew" rel="http://webfinger.net/rel/profile-page" type="text/html" /><Link href="https://lm.kazv.moe/users/mewmew" rel="self" type="application/activity+json" /><Link href="https://lm.kazv.moe/users/mewmew" rel="self" type="application/ld+json; profile=&quot;https://www.w3.org/ns/activitystreams&quot;" /><Link rel="http://ostatus.org/schema/1.0/subscribe" template="https://lm.kazv.moe/ostatus_subscribe?acct={uri}" /></XRD>

test/fixtures/tesla_mock/lm.kazv.moe_host_meta

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0"><Link rel="lrdd" template="https://lm.kazv.moe/.well-known/webfinger?resource={uri}" type="application/xrd+xml" /></XRD>

test/fixtures/tesla_mock/mewmew@lm.kazv.moe.json

@@ -0,0 +1 @@
+{"@context":["https://www.w3.org/ns/activitystreams","https://lm.kazv.moe/schemas/litepub-0.1.jsonld",{"@language":"und"}],"alsoKnownAs":["https://lm.kazv.moe/users/tester","https://lm.kazv.moe/users/testuser"],"attachment":[],"capabilities":{"acceptsChatMessages":true},"discoverable":false,"endpoints":{"oauthAuthorizationEndpoint":"https://lm.kazv.moe/oauth/authorize","oauthRegistrationEndpoint":"https://lm.kazv.moe/api/v1/apps","oauthTokenEndpoint":"https://lm.kazv.moe/oauth/token","sharedInbox":"https://lm.kazv.moe/inbox","uploadMedia":"https://lm.kazv.moe/api/ap/upload_media"},"featured":"https://lm.kazv.moe/users/mewmew/collections/featured","followers":"https://lm.kazv.moe/users/mewmew/followers","following":"https://lm.kazv.moe/users/mewmew/following","id":"https://lm.kazv.moe/users/mewmew","inbox":"https://lm.kazv.moe/users/mewmew/inbox","manuallyApprovesFollowers":false,"name":"mew","outbox":"https://lm.kazv.moe/users/mewmew/outbox","preferredUsername":"mewmew","publicKey":{"id":"https://lm.kazv.moe/users/mewmew#main-key","owner":"https://lm.kazv.moe/users/mewmew","publicKeyPem":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0nT3IVUwx799FSJyJEOY\n5D2c5zgtt2Z+BD9417eVLmVQF5fJlWgcKS4pbFc76zkYoBkZtV7XbzvN9KTNulpa\nUGNOM0/UdEoQLB8xbVCMm0ABUU8vbTWoMTxp93bfVHBz+33FPYdH1JHX4TCU/mJF\nX4UJMvFmMn5BFjSQm9GG6Eq2j6SAUsaTa8+Rrd8FzS6zb/dk3N/Llz0tfsZYS0sq\nEy9OYhsKOQ6eegULFJOF3Hz04vzwftmeXFsbb3aO2zKz3uAMYZglWHNBYJAePBtJ\ng362kqdJwgT14TFnZ0K2ziDPbkRULG1Kke/lsqw2rPF6Q6P4PeO1shCEDthoDoID\newIDAQAB\n-----END PUBLIC KEY-----\n\n"},"summary":"","tag":[],"type":"Person","url":"https://lm.kazv.moe/users/mewmew"}

test/pleroma/user_test.exs

@@ -2521,4 +2521,80 @@ defmodule Pleroma.UserTest do
     %{object: %{data: %{"id" => object_id}}} = Activity.get_by_id_with_object(id)
     object_id
   end
+
+  describe "add_alias/2" do
+    test "should add alias for another user" do
+      user = insert(:user)
+      user2 = insert(:user)
+
+      assert {:ok, user_updated} = user |> User.add_alias(user2)
+
+      assert user_updated.also_known_as |> length() == 1
+      assert user2.ap_id in user_updated.also_known_as
+    end
+
+    test "should add multiple aliases" do
+      user = insert(:user)
+      user2 = insert(:user)
+      user3 = insert(:user)
+
+      assert {:ok, user} = user |> User.add_alias(user2)
+      assert {:ok, user_updated} = user |> User.add_alias(user3)
+
+      assert user_updated.also_known_as |> length() == 2
+      assert user2.ap_id in user_updated.also_known_as
+      assert user3.ap_id in user_updated.also_known_as
+    end
+
+    test "should not add duplicate aliases" do
+      user = insert(:user)
+      user2 = insert(:user)
+
+      assert {:ok, user} = user |> User.add_alias(user2)
+
+      assert {:ok, user_updated} = user |> User.add_alias(user2)
+
+      assert user_updated.also_known_as |> length() == 1
+      assert user2.ap_id in user_updated.also_known_as
+    end
+  end
+
+  describe "alias_users/1" do
+    test "should get aliases for a user" do
+      user = insert(:user)
+      user2 = insert(:user, also_known_as: [user.ap_id])
+
+      aliases = user2 |> User.alias_users()
+
+      assert aliases |> length() == 1
+
+      alias_user = aliases |> Enum.at(0)
+
+      assert alias_user.ap_id == user.ap_id
+    end
+  end
+
+  describe "delete_alias/2" do
+    test "should delete existing alias" do
+      user = insert(:user)
+      user2 = insert(:user, also_known_as: [user.ap_id])
+
+      assert {:ok, user_updated} = user2 |> User.delete_alias(user)
+
+      assert user_updated.also_known_as == []
+    end
+
+    test "should report error on non-existing alias" do
+      user = insert(:user)
+      user2 = insert(:user)
+      user3 = insert(:user, also_known_as: [user.ap_id])
+
+      assert {:error, :no_such_alias} = user3 |> User.delete_alias(user2)
+
+      user3_updated = User.get_cached_by_ap_id(user3.ap_id)
+
+      assert user3_updated.also_known_as |> length() == 1
+      assert user.ap_id in user3_updated.also_known_as
+    end
+  end
 end

test/pleroma/web/activity_pub/activity_pub_test.exs

@@ -1777,9 +1777,12 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
                  "target" => ^new_ap_id,
                  "type" => "Move"
                },
-               local: true
+               local: true,
+               recipients: recipients
              } = activity
 
+      assert old_user.follower_address in recipients
+
       params = %{
         "op" => "move_following",
         "origin_id" => old_user.id,
@@ -1810,6 +1813,42 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
       assert {:error, "Target account must have the origin in `alsoKnownAs`"} =
                ActivityPub.move(old_user, new_user)
     end
+
+    test "do not move remote user following relationships" do
+      %{ap_id: old_ap_id} = old_user = insert(:user)
+      %{ap_id: new_ap_id} = new_user = insert(:user, also_known_as: [old_ap_id])
+      follower_remote = insert(:user, local: false)
+
+      User.follow(follower_remote, old_user)
+
+      assert User.following?(follower_remote, old_user)
+
+      assert {:ok, activity} = ActivityPub.move(old_user, new_user)
+
+      assert %Activity{
+               actor: ^old_ap_id,
+               data: %{
+                 "actor" => ^old_ap_id,
+                 "object" => ^old_ap_id,
+                 "target" => ^new_ap_id,
+                 "type" => "Move"
+               },
+               local: true
+             } = activity
+
+      params = %{
+        "op" => "move_following",
+        "origin_id" => old_user.id,
+        "target_id" => new_user.id
+      }
+
+      assert_enqueued(worker: Pleroma.Workers.BackgroundWorker, args: params)
+
+      Pleroma.Workers.BackgroundWorker.perform(%Oban.Job{args: params})
+
+      assert User.following?(follower_remote, old_user)
+      refute User.following?(follower_remote, new_user)
+    end
   end
 
   test "doesn't retrieve replies activities with exclude_replies" do

test/pleroma/web/twitter_api/util_controller_test.exs

@@ -516,4 +516,371 @@ defmodule Pleroma.Web.TwitterAPI.UtilControllerTest do
       assert user.password_hash == nil
     end
   end
+
+  describe "POST /api/pleroma/move_account" do
+    setup do: oauth_access(["write:accounts"])
+
+    test "without permissions", %{conn: conn} do
+      target_user = insert(:user)
+      target_nick = target_user |> User.full_nickname()
+
+      conn =
+        conn
+        |> assign(:token, nil)
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post("/api/pleroma/move_account", %{
+          "password" => "hi",
+          "target_account" => target_nick
+        })
+
+      assert json_response_and_validate_schema(conn, 403) == %{
+               "error" => "Insufficient permissions: write:accounts."
+             }
+    end
+
+    test "with proper permissions and invalid password", %{conn: conn} do
+      target_user = insert(:user)
+      target_nick = target_user |> User.full_nickname()
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post("/api/pleroma/move_account", %{
+          "password" => "hi",
+          "target_account" => target_nick
+        })
+
+      assert json_response_and_validate_schema(conn, 200) == %{"error" => "Invalid password."}
+    end
+
+    test "with proper permissions, valid password and target account does not alias this",
+         %{
+           conn: conn
+         } do
+      target_user = insert(:user)
+      target_nick = target_user |> User.full_nickname()
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post("/api/pleroma/move_account", %{
+          "password" => "test",
+          "target_account" => target_nick
+        })
+
+      assert json_response_and_validate_schema(conn, 200) == %{
+               "error" => "Target account must have the origin in `alsoKnownAs`"
+             }
+    end
+
+    test "with proper permissions, valid password and target account does not exist",
+         %{
+           conn: conn
+         } do
+      target_nick = "not_found@mastodon.social"
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post("/api/pleroma/move_account", %{
+          "password" => "test",
+          "target_account" => target_nick
+        })
+
+      assert json_response_and_validate_schema(conn, 404) == %{
+               "error" => "Target account not found."
+             }
+    end
+
+    test "with proper permissions, valid password, remote target account aliases this and local cache does not exist",
+         %{} do
+      user = insert(:user, ap_id: "https://lm.kazv.moe/users/testuser")
+      %{user: _user, conn: conn} = oauth_access(["write:accounts"], user: user)
+
+      target_nick = "mewmew@lm.kazv.moe"
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post("/api/pleroma/move_account", %{
+          "password" => "test",
+          "target_account" => target_nick
+        })
+
+      assert json_response_and_validate_schema(conn, 200) == %{"status" => "success"}
+    end
+
+    test "with proper permissions, valid password, remote target account aliases this and local cache does not alias this",
+         %{} do
+      user = insert(:user, ap_id: "https://lm.kazv.moe/users/testuser")
+      %{user: _user, conn: conn} = oauth_access(["write:accounts"], user: user)
+
+      target_user =
+        insert(
+          :user,
+          ap_id: "https://lm.kazv.moe/users/mewmew",
+          nickname: "mewmew@lm.kazv.moe",
+          local: false
+        )
+
+      target_nick = target_user |> User.full_nickname()
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post("/api/pleroma/move_account", %{
+          "password" => "test",
+          "target_account" => target_nick
+        })
+
+      assert json_response_and_validate_schema(conn, 200) == %{"status" => "success"}
+    end
+
+    test "with proper permissions, valid password, remote target account does not alias this and local cache aliases this",
+         %{
+           user: user,
+           conn: conn
+         } do
+      target_user =
+        insert(
+          :user,
+          ap_id: "https://lm.kazv.moe/users/mewmew",
+          nickname: "mewmew@lm.kazv.moe",
+          local: false,
+          also_known_as: [user.ap_id]
+        )
+
+      target_nick = target_user |> User.full_nickname()
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post("/api/pleroma/move_account", %{
+          "password" => "test",
+          "target_account" => target_nick
+        })
+
+      assert json_response_and_validate_schema(conn, 200) == %{
+               "error" => "Target account must have the origin in `alsoKnownAs`"
+             }
+    end
+
+    test "with proper permissions, valid password and target account aliases this", %{
+      conn: conn,
+      user: user
+    } do
+      target_user = insert(:user, also_known_as: [user.ap_id])
+      target_nick = target_user |> User.full_nickname()
+      follower = insert(:user)
+
+      User.follow(follower, user)
+
+      assert User.following?(follower, user)
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post(
+          "/api/pleroma/move_account",
+          %{
+            password: "test",
+            target_account: target_nick
+          }
+        )
+
+      assert json_response_and_validate_schema(conn, 200) == %{"status" => "success"}
+
+      params = %{
+        "op" => "move_following",
+        "origin_id" => user.id,
+        "target_id" => target_user.id
+      }
+
+      assert_enqueued(worker: Pleroma.Workers.BackgroundWorker, args: params)
+
+      Pleroma.Workers.BackgroundWorker.perform(%Oban.Job{args: params})
+
+      refute User.following?(follower, user)
+      assert User.following?(follower, target_user)
+    end
+
+    test "prefix nickname by @ should work", %{
+      conn: conn,
+      user: user
+    } do
+      target_user = insert(:user, also_known_as: [user.ap_id])
+      target_nick = target_user |> User.full_nickname()
+      follower = insert(:user)
+
+      User.follow(follower, user)
+
+      assert User.following?(follower, user)
+
+      conn =
+        conn
+        |> put_req_header("content-type", "multipart/form-data")
+        |> post(
+          "/api/pleroma/move_account",
+          %{
+            password: "test",
+            target_account: "@" <> target_nick
+          }
+        )
+
+      assert json_response_and_validate_schema(conn, 200) == %{"status" => "success"}
+
+      params = %{
+        "op" => "move_following",
+        "origin_id" => user.id,
+        "target_id" => target_user.id
+      }
+
+      assert_enqueued(worker: Pleroma.Workers.BackgroundWorker, args: params)
+
+      Pleroma.Workers.BackgroundWorker.perform(%Oban.Job{args: params})
+
+      refute User.following?(follower, user)
+      assert User.following?(follower, target_user)
+    end
+  end
+
+  describe "GET /api/pleroma/aliases" do
+    setup do: oauth_access(["read:accounts"])
+
+    test "without permissions", %{conn: conn} do
+      conn =
+        conn
+        |> assign(:token, nil)
+        |> get("/api/pleroma/aliases")
+
+      assert json_response_and_validate_schema(conn, 403) == %{
+               "error" => "Insufficient permissions: read:accounts."
+             }
+    end
+
+    test "with permissions", %{
+      conn: conn
+    } do
+      assert %{"aliases" => []} =
+               conn
+               |> get("/api/pleroma/aliases")
+               |> json_response_and_validate_schema(200)
+    end
+
+    test "with permissions and aliases", %{} do
+      user = insert(:user)
+      user2 = insert(:user)
+
+      assert {:ok, user} = user |> User.add_alias(user2)
+
+      %{user: _user, conn: conn} = oauth_access(["read:accounts"], user: user)
+
+      assert %{"aliases" => aliases} =
+               conn
+               |> get("/api/pleroma/aliases")
+               |> json_response_and_validate_schema(200)
+
+      assert aliases == [user2 |> User.full_nickname()]
+    end
+  end
+
+  describe "PUT /api/pleroma/aliases" do
+    setup do: oauth_access(["write:accounts"])
+
+    test "without permissions", %{conn: conn} do
+      conn =
+        conn
+        |> assign(:token, nil)
+        |> put_req_header("content-type", "application/json")
+        |> put("/api/pleroma/aliases", %{alias: "none"})
+
+      assert json_response_and_validate_schema(conn, 403) == %{
+               "error" => "Insufficient permissions: write:accounts."
+             }
+    end
+
+    test "with permissions, no alias param", %{
+      conn: conn
+    } do
+      conn =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> put("/api/pleroma/aliases", %{})
+
+      assert %{"error" => "Missing field: alias."} = json_response_and_validate_schema(conn, 400)
+    end
+
+    test "with permissions, with alias param", %{
+      conn: conn
+    } do
+      user2 = insert(:user)
+
+      conn =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> put("/api/pleroma/aliases", %{alias: user2 |> User.full_nickname()})
+
+      assert json_response_and_validate_schema(conn, 200) == %{
+               "status" => "success"
+             }
+    end
+  end
+
+  describe "DELETE /api/pleroma/aliases" do
+    setup do
+      alias_user = insert(:user)
+      non_alias_user = insert(:user)
+      user = insert(:user, also_known_as: [alias_user.ap_id])
+
+      oauth_access(["write:accounts"], user: user)
+      |> Map.put(:alias_user, alias_user)
+      |> Map.put(:non_alias_user, non_alias_user)
+    end
+
+    test "without permissions", %{conn: conn} do
+      conn =
+        conn
+        |> assign(:token, nil)
+        |> put_req_header("content-type", "application/json")
+        |> delete("/api/pleroma/aliases", %{alias: "none"})
+
+      assert json_response_and_validate_schema(conn, 403) == %{
+               "error" => "Insufficient permissions: write:accounts."
+             }
+    end
+
+    test "with permissions, no alias param", %{conn: conn} do
+      conn =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> delete("/api/pleroma/aliases", %{})
+
+      assert %{"error" => "Missing field: alias."} = json_response_and_validate_schema(conn, 400)
+    end
+
+    test "with permissions, account does not have such alias", %{
+      conn: conn,
+      non_alias_user: non_alias_user
+    } do
+      conn =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> delete("/api/pleroma/aliases", %{alias: non_alias_user |> User.full_nickname()})
+
+      assert %{"error" => "Account has no such alias."} =
+               json_response_and_validate_schema(conn, 404)
+    end
+
+    test "with permissions, account does have such alias", %{
+      conn: conn,
+      alias_user: alias_user
+    } do
+      conn =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> delete("/api/pleroma/aliases", %{alias: alias_user |> User.full_nickname()})
+
+      assert %{"status" => "success"} = json_response_and_validate_schema(conn, 200)
+    end
+  end
 end

test/support/http_request_mock.ex

@@ -725,6 +725,15 @@ defmodule HttpRequestMock do
      }}
   end
 
+  def get(
+        "https://mastodon.social/.well-known/webfinger?resource=acct:not_found@mastodon.social",
+        _,
+        _,
+        [{"accept", "application/xrd+xml,application/jrd+json"}]
+      ) do
+    {:ok, %Tesla.Env{status: 404}}
+  end
+
   def get("http://gs.example.org/.well-known/host-meta", _, _, _) do
     {:ok,
      %Tesla.Env{
@@ -1124,6 +1133,57 @@ defmodule HttpRequestMock do
      }}
   end
 
+  def get("http://lm.kazv.moe/.well-known/host-meta", _, _, _) do
+    {:ok,
+     %Tesla.Env{
+       status: 200,
+       body: File.read!("test/fixtures/tesla_mock/lm.kazv.moe_host_meta")
+     }}
+  end
+
+  def get("https://lm.kazv.moe/.well-known/host-meta", _, _, _) do
+    {:ok,
+     %Tesla.Env{
+       status: 200,
+       body: File.read!("test/fixtures/tesla_mock/lm.kazv.moe_host_meta")
+     }}
+  end
+
+  def get(
+        "https://lm.kazv.moe/.well-known/webfinger?resource=acct:mewmew@lm.kazv.moe",
+        _,
+        _,
+        [{"accept", "application/xrd+xml,application/jrd+json"}]
+      ) do
+    {:ok,
+     %Tesla.Env{
+       status: 200,
+       body: File.read!("test/fixtures/tesla_mock/https___lm.kazv.moe_users_mewmew.xml"),
+       headers: [{"content-type", "application/xrd+xml"}]
+     }}
+  end
+
+  def get("https://lm.kazv.moe/users/mewmew", _, _, _) do
+    {:ok,
+     %Tesla.Env{
+       status: 200,
+       body: File.read!("test/fixtures/tesla_mock/mewmew@lm.kazv.moe.json"),
+       headers: activitypub_object_headers()
+     }}
+  end
+
+  def get("https://lm.kazv.moe/users/mewmew/collections/featured", _, _, _) do
+    {:ok,
+     %Tesla.Env{
+       status: 200,
+       body:
+         File.read!("test/fixtures/users_mock/masto_featured.json")
+         |> String.replace("{{domain}}", "lm.kazv.moe")
+         |> String.replace("{{nickname}}", "mewmew"),
+       headers: [{"content-type", "application/activity+json"}]
+     }}
+  end
+
   def get("https://info.pleroma.site/activity.json", _, _, [
         {"accept", "application/activity+json"}
       ]) do