util_controller.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.TwitterAPI.UtilController do
	use Pleroma.Web, :controller

	require Logger

	alias Comeonin.Pbkdf2
	alias Pleroma.Activity
	alias Pleroma.Emoji
	alias Pleroma.Notification
	alias Pleroma.PasswordResetToken
	alias Pleroma.Repo
	alias Pleroma.User
	alias Pleroma.Web
	alias Pleroma.Web.ActivityPub.ActivityPub
	alias Pleroma.Web.CommonAPI
	alias Pleroma.Web.OStatus
	alias Pleroma.Web.WebFinger

	def show_password_reset(conn, %{"token" => token}) do
	with %{used: false} = token <- Repo.get_by(PasswordResetToken, %{token: token}),
	%User{} = user <- User.get_by_id(token.user_id) do
	render(conn, "password_reset.html", %{
	token: token,
	user: user
	})
	else
	_e -> render(conn, "invalid_token.html")
	end
	end

	def password_reset(conn, %{"data" => data}) do
	with {:ok, _} <- PasswordResetToken.reset_password(data["token"], data) do
	render(conn, "password_reset_success.html")
	else
	_e -> render(conn, "password_reset_failed.html")
	end
	end

	def help_test(conn, _params) do
	json(conn, "ok")
	end

	def remote_subscribe(conn, %{"nickname" => nick, "profile" => _}) do
	with %User{} = user <- User.get_cached_by_nickname(nick), avatar = User.avatar_url(user) do
	conn
	\|> render("subscribe.html", %{nickname: nick, avatar: avatar, error: false})
	else
	_e ->
	render(conn, "subscribe.html", %{
	nickname: nick,
	avatar: nil,
	error: "Could not find user"
	})
	end
	end

	def remote_subscribe(conn, %{"user" => %{"nickname" => nick, "profile" => profile}}) do
	with {:ok, %{"subscribe_address" => template}} <- WebFinger.finger(profile),
	%User{ap_id: ap_id} <- User.get_cached_by_nickname(nick) do
	conn
	\|> Phoenix.Controller.redirect(external: String.replace(template, "{uri}", ap_id))
	else
	_e ->
	render(conn, "subscribe.html", %{
	nickname: nick,
	avatar: nil,
	error: "Something went wrong."
	})
	end
	end

	def remote_follow(%{assigns: %{user: user}} = conn, %{"acct" => acct}) do
	if is_status?(acct) do
	{:ok, object} = ActivityPub.fetch_object_from_id(acct)
	%Activity{id: activity_id} = Activity.get_create_by_object_ap_id(object.data["id"])
	redirect(conn, to: "/notice/#{activity_id}")
	else
	{err, followee} = OStatus.find_or_make_user(acct)
	avatar = User.avatar_url(followee)
	name = followee.nickname
	id = followee.id

	if !!user do
	conn
	\|> render("follow.html", %{error: err, acct: acct, avatar: avatar, name: name, id: id})
	else
	conn
	\|> render("follow_login.html", %{
	error: false,
	acct: acct,
	avatar: avatar,
	name: name,
	id: id
	})
	end
	end
	end

	defp is_status?(acct) do
	case ActivityPub.fetch_and_contain_remote_object_from_id(acct) do
	{:ok, %{"type" => type}} when type in ["Article", "Note", "Video", "Page", "Question"] ->
	true

	_ ->
	false
	end
	end

	def do_remote_follow(conn, %{
	"authorization" => %{"name" => username, "password" => password, "id" => id}
	}) do
	followee = User.get_by_id(id)
	avatar = User.avatar_url(followee)
	name = followee.nickname

	with %User{} = user <- User.get_cached_by_nickname(username),
	true <- Pbkdf2.checkpw(password, user.password_hash),
	%User{} = _followed <- User.get_by_id(id),
	{:ok, follower} <- User.follow(user, followee),
	{:ok, _activity} <- ActivityPub.follow(follower, followee) do
	conn
	\|> render("followed.html", %{error: false})
	else
	# Was already following user
	{:error, "Could not follow user:" <> _rest} ->
	render(conn, "followed.html", %{error: false})

	_e ->
	conn
	\|> render("follow_login.html", %{
	error: "Wrong username or password",
	id: id,
	name: name,
	avatar: avatar
	})
	end
	end

	def do_remote_follow(%{assigns: %{user: user}} = conn, %{"user" => %{"id" => id}}) do
	with %User{} = followee <- User.get_by_id(id),
	{:ok, follower} <- User.follow(user, followee),
	{:ok, _activity} <- ActivityPub.follow(follower, followee) do
	conn
	\|> render("followed.html", %{error: false})
	else
	# Was already following user
	{:error, "Could not follow user:" <> _rest} ->
	conn
	\|> render("followed.html", %{error: false})

	e ->
	Logger.debug("Remote follow failed with error #{inspect(e)}")

	conn
	\|> render("followed.html", %{error: inspect(e)})
	end
	end

	def notifications_read(%{assigns: %{user: user}} = conn, %{"id" => notification_id}) do
	with {:ok, _} <- Notification.read_one(user, notification_id) do
	json(conn, %{status: "success"})
	else
	{:error, message} ->
	conn
	\|> put_resp_content_type("application/json")
	\|> send_resp(403, Jason.encode!(%{"error" => message}))
	end
	end

	def config(conn, _params) do
	instance = Pleroma.Config.get(:instance)
	instance_fe = Pleroma.Config.get(:fe)
	instance_chat = Pleroma.Config.get(:chat)

	case get_format(conn) do
	"xml" ->
	response = """
	<config>
	<site>
	<name>#{Keyword.get(instance, :name)}</name>
	<site>#{Web.base_url()}</site>
	<textlimit>#{Keyword.get(instance, :limit)}</textlimit>
	<closed>#{!Keyword.get(instance, :registrations_open)}</closed>
	</site>
	</config>
	"""

	conn
	\|> put_resp_content_type("application/xml")
	\|> send_resp(200, response)

	_ ->
	vapid_public_key = Keyword.get(Pleroma.Web.Push.vapid_config(), :public_key)

	uploadlimit = %{
	uploadlimit: to_string(Keyword.get(instance, :upload_limit)),
	avatarlimit: to_string(Keyword.get(instance, :avatar_upload_limit)),
	backgroundlimit: to_string(Keyword.get(instance, :background_upload_limit)),
	bannerlimit: to_string(Keyword.get(instance, :banner_upload_limit))
	}

	data = %{
	name: Keyword.get(instance, :name),
	description: Keyword.get(instance, :description),
	server: Web.base_url(),
	textlimit: to_string(Keyword.get(instance, :limit)),
	uploadlimit: uploadlimit,
	closed: if(Keyword.get(instance, :registrations_open), do: "0", else: "1"),
	private: if(Keyword.get(instance, :public, true), do: "0", else: "1"),
	vapidPublicKey: vapid_public_key,
	accountActivationRequired:
	if(Keyword.get(instance, :account_activation_required, false), do: "1", else: "0"),
	invitesEnabled: if(Keyword.get(instance, :invites_enabled, false), do: "1", else: "0"),
	safeDMMentionsEnabled:
	if(Pleroma.Config.get([:instance, :safe_dm_mentions]), do: "1", else: "0")
	}

	pleroma_fe =
	if instance_fe do
	%{
	theme: Keyword.get(instance_fe, :theme),
	background: Keyword.get(instance_fe, :background),
	logo: Keyword.get(instance_fe, :logo),
	logoMask: Keyword.get(instance_fe, :logo_mask),
	logoMargin: Keyword.get(instance_fe, :logo_margin),
	redirectRootNoLogin: Keyword.get(instance_fe, :redirect_root_no_login),
	redirectRootLogin: Keyword.get(instance_fe, :redirect_root_login),
	chatDisabled: !Keyword.get(instance_chat, :enabled),
	showInstanceSpecificPanel: Keyword.get(instance_fe, :show_instance_panel),
	scopeOptionsEnabled: Keyword.get(instance_fe, :scope_options_enabled),
	formattingOptionsEnabled: Keyword.get(instance_fe, :formatting_options_enabled),
	collapseMessageWithSubject:
	Keyword.get(instance_fe, :collapse_message_with_subject),
	hidePostStats: Keyword.get(instance_fe, :hide_post_stats),
	hideUserStats: Keyword.get(instance_fe, :hide_user_stats),
	scopeCopy: Keyword.get(instance_fe, :scope_copy),
	subjectLineBehavior: Keyword.get(instance_fe, :subject_line_behavior),
	alwaysShowSubjectInput: Keyword.get(instance_fe, :always_show_subject_input)
	}
	else
	Pleroma.Config.get([:frontend_configurations, :pleroma_fe])
	end

	managed_config = Keyword.get(instance, :managed_config)

	data =
	if managed_config do
	data \|> Map.put("pleromafe", pleroma_fe)
	else
	data
	end

	json(conn, %{site: data})
	end
	end

	def frontend_configurations(conn, _params) do
	config =
	Pleroma.Config.get(:frontend_configurations, %{})
	\|> Enum.into(%{})

	json(conn, config)
	end

	def version(conn, _params) do
	version = Pleroma.Application.named_version()

	case get_format(conn) do
	"xml" ->
	response = "<version>#{version}</version>"

	conn
	\|> put_resp_content_type("application/xml")
	\|> send_resp(200, response)

	_ ->
	json(conn, version)
	end
	end

	def emoji(conn, _params) do
	emoji =
	Emoji.get_all()
	\|> Enum.map(fn {short_code, path, tags} ->
	%{short_code => %{image_url: path, tags: String.split(tags, ",")}}
	end)

	json(conn, emoji)
	end

	def update_notificaton_settings(%{assigns: %{user: user}} = conn, params) do
	with {:ok, _} <- User.update_notification_settings(user, params) do
	json(conn, %{status: "success"})
	end
	end

	def follow_import(conn, %{"list" => %Plug.Upload{} = listfile}) do
	follow_import(conn, %{"list" => File.read!(listfile.path)})
	end

	def follow_import(%{assigns: %{user: follower}} = conn, %{"list" => list}) do
	with followed_identifiers <- String.split(list),
	{:ok, _} = Task.start(fn -> User.follow_import(follower, followed_identifiers) end) do
	json(conn, "job started")
	end
	end

	def blocks_import(conn, %{"list" => %Plug.Upload{} = listfile}) do
	blocks_import(conn, %{"list" => File.read!(listfile.path)})
	end

	def blocks_import(%{assigns: %{user: blocker}} = conn, %{"list" => list}) do
	with blocked_identifiers <- String.split(list),
	{:ok, _} = Task.start(fn -> User.blocks_import(blocker, blocked_identifiers) end) do
	json(conn, "job started")
	end
	end

	def change_password(%{assigns: %{user: user}} = conn, params) do
	case CommonAPI.Utils.confirm_current_password(user, params["password"]) do
	{:ok, user} ->
	with {:ok, _user} <-
	User.reset_password(user, %{
	password: params["new_password"],
	password_confirmation: params["new_password_confirmation"]
	}) do
	json(conn, %{status: "success"})
	else
	{:error, changeset} ->
	{_, {error, _}} = Enum.at(changeset.errors, 0)
	json(conn, %{error: "New password #{error}."})

	_ ->
	json(conn, %{error: "Unable to change password."})
	end

	{:error, msg} ->
	json(conn, %{error: msg})
	end
	end

	def delete_account(%{assigns: %{user: user}} = conn, params) do
	case CommonAPI.Utils.confirm_current_password(user, params["password"]) do
	{:ok, user} ->
	Task.start(fn -> User.delete(user) end)
	json(conn, %{status: "success"})

	{:error, msg} ->
	json(conn, %{error: msg})
	end
	end

	def captcha(conn, _params) do
	json(conn, Pleroma.Captcha.new())
	end
	end

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