236 lines
8.1 KiB
PHP
236 lines
8.1 KiB
PHP
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<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Remote Follow implementation for GNU social
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*
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* @package GNUsocial
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* @author Bruno Casteleiro <brunoccast@fc.up.pt>
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* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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defined('GNUSOCIAL') || die();
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/**
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* Remote-follow preparation action
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*
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* @category Plugin
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* @package GNUsocial
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* @author Bruno Casteleiro <brunoccast@fc.up.pt>
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class RemoteFollowInitAction extends Action
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{
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protected $target = null;
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protected $profile = null;
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protected function prepare(array $args = [])
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{
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parent::prepare($args);
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if (common_logged_in()) {
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// TRANS: Client error displayed when the user is logged in.
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$this->clientError(_m('You can use the local subscription!'));
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}
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// Local user the remote wants to follow
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$nickname = $this->trimmed('nickname');
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$this->target = User::getKV('nickname', $nickname);
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if (!$this->target instanceof User) {
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// TRANS: Client error displayed when targeting an invalid user.
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$this->clientError(_m('No such user.'));
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}
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// Webfinger or profile URL of the remote user
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$this->profile = $this->trimmed('profile');
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return true;
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}
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protected function handle()
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{
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parent::handle();
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if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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/* Use a session token for CSRF protection. */
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$token = $this->trimmed('token');
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if (!$token || $token != common_session_token()) {
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// TRANS: Error displayed when the session token does not match or is not given.
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$this->showForm(_m('There was a problem with your session token. '.
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'Try again, please.'));
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return;
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}
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$url = null;
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if (Event::handle('RemoteFollowConnectProfile', [$this->target, $this->profile, &$url])) {
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// use ported ostatus connect functions to find remote url
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$url = self::ostatusConnect($this->target, $this->profile);
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}
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if (!is_null($url)) {
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common_redirect($url, 303);
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}
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// TRANS: Error displayed when there is failure in connecting with the remote profile.
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$this->showForm(_m('There was a problem connecting with the remote profile. '.
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'Try again, please.'));
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} else {
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$this->showForm();
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}
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}
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function showContent()
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{
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// TRANS: Form legend. %s is a nickname.
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$header = sprintf(_m('Subscribe to %s'), $this->target->getNickname());
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// TRANS: Button text to subscribe to a profile.
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$submit = _m('BUTTON', 'Subscribe');
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$this->elementStart('form',
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['id' => 'form_ostatus_connect',
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'method' => 'post',
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'class' => 'form_settings',
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'action' => common_local_url('RemoteFollowInit')]);
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$this->elementStart('fieldset');
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$this->element('legend', null, $header);
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$this->hidden('token', common_session_token());
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$this->elementStart('ul', 'form_data');
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$this->elementStart('li', ['id' => 'ostatus_nickname']);
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$this->input('nickname',
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// TRANS: Field label.
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_m('User nickname'),
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$this->target->getNickname(),
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// TRANS: Field title.
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_m('Nickname of the user you want to follow.'));
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$this->elementEnd('li');
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$this->elementStart('li', ['id' => 'ostatus_profile']);
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$this->input('profile',
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// TRANS: Field label.
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_m('Profile Account'),
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$this->profile,
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// TRANS: Tooltip for field label "Profile Account".
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_m('Your account ID (e.g. user@example.com).'));
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$this->elementEnd('li');
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$this->elementEnd('ul');
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$this->submit('submit', $submit);
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$this->elementEnd('fieldset');
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$this->elementEnd('form');
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}
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public function showForm($err = null)
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{
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if ($err) {
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$this->error = $err;
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}
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if ($this->boolean('ajax')) {
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$this->startHTML('text/xml;charset=utf-8');
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$this->elementStart('head');
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// TRANS: Form title.
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$this->element('title', null, _m('TITLE','Subscribe to user'));
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$this->elementEnd('head');
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$this->elementStart('body');
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$this->showContent();
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$this->elementEnd('body');
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$this->endHTML();
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} else {
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$this->showPage();
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}
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}
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/**
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* Find remote url to finish follow interaction
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*
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* @param User $target local user to be followed
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* @param string $remote ID of the remote subscriber
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* @return string|null
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*/
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public static function ostatusConnect(User $target, string $remote): ?string
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{
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$validate = new Validate();
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$opts = ['allowed_schemes' => ['http', 'https', 'acct']];
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if ($validate->uri($remote, $opts)) {
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$bits = parse_url($remote);
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if ($bits['scheme'] == 'acct') {
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return self::connectWebfinger($bits['path'], $target);
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} else {
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return self::connectProfile($remote, $target);
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}
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} else if (strpos($remote, '@') !== false) {
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return self::connectWebfinger($remote, $target);
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}
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common_log(LOG_ERR, 'Must provide a remote profile');
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return null;
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}
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/**
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* Find remote url to finish follow interaction from a webfinger ID
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*
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* @param string $acct
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* @param User $target
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* @return string|null
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* @see ostatusConnect
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*/
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public static function connectWebfinger(string $acct, User $target): ?string
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{
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$target = common_local_url('userbyid', ['id' => $target->getID()]);
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$disco = new Discovery;
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$xrd = $disco->lookup($acct);
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$link = $xrd->get('http://ostatus.org/schema/1.0/subscribe');
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if (!is_null($link)) {
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// We found a URL - let's redirect!
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if (!empty($link->template)) {
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$url = Discovery::applyTemplate($link->template, $target);
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} else {
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$url = $link->href;
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}
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common_log(LOG_INFO, "Retrieving url $url for remote subscriber $acct");
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return $url;
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}
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common_log(LOG_ERR, "Could not confirm remote profile $acct");
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return null;
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}
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/**
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* Find remote url to finish follow interaction from an url ID
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*
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* @param string $acct
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* @param User $target
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* @return string
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* @see ostatusConnect
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*/
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public static function connectProfile(string $url, User $target): string
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{
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$target = common_local_url('userbyid', ['id' => $target->getID()]);
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// @fixme hack hack! We should look up the remote sub URL from XRDS
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$suburl = preg_replace('!^(.*)/(.*?)$!', '$1/main/ostatussub', $url);
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$suburl .= '?profile=' . urlencode($target);
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common_log(LOG_INFO, "Retrieving url $suburl for remote subscriber $url");
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return $suburl;
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}
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}
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