mirror of
https://github.com/RSS-Bridge/rss-bridge.git
synced 2024-11-23 07:37:35 +00:00
294 lines
12 KiB
PHP
294 lines
12 KiB
PHP
<?php
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class MastodonBridge extends BridgeAbstract
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{
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// This script attempts to imitiate the behaviour of a read-only ActivityPub server
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// to read the outbox.
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// Note: Most PixelFed instances have ActivityPub outbox disabled,
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// so use the official feed: https://pixelfed.instance/users/username.atom (Posts only)
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const MAINTAINER = 'Austin Huang';
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const NAME = 'ActivityPub Bridge';
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const CACHE_TIMEOUT = 900; // 15mn
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const DESCRIPTION = 'Returns recent statuses. Supports Mastodon, Pleroma and Misskey, among others. Access to
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instances that have Authorized Fetch enabled requires
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<a href="https://rss-bridge.github.io/rss-bridge/Bridge_Specific/ActivityPub_(Mastodon).html">configuration</a>.';
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const URI = 'https://mastodon.social';
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// Some Mastodon instances use Secure Mode which requires all requests to be signed.
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// You do not need this for most instances, but if you want to support every known
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// instance, then you should configure them.
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// See also https://docs.joinmastodon.org/spec/security/#http
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const CONFIGURATION = [
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'private_key' => [
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'required' => false,
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],
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'key_id' => [
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'required' => false,
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],
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];
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const PARAMETERS = [[
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'canusername' => [
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'name' => 'Canonical username',
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'exampleValue' => '@sebsauvage@framapiaf.org',
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'required' => true,
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],
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'noregular' => [
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'name' => 'Without regular statuses',
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'type' => 'checkbox',
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'title' => 'Hide regular statuses (i.e. non-boosts, replies, etc.)',
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],
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'norep' => [
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'name' => 'Without replies',
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'type' => 'checkbox',
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'title' => 'Hide replies, as determined by relations (not mentions).'
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],
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'noboost' => [
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'name' => 'Without boosts',
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'type' => 'checkbox',
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'title' => 'Hide boosts. This will reduce loading time as RSS-Bridge fetches the boosted status from other federated instances.'
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],
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'signaturetype' => [
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'type' => 'list',
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'name' => 'Signature Type',
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'title' => 'How to sign requests when fetching from instances.
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Defaults to "nosig" for RSS-Bridge instances that did not set up signatures.',
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'values' => [
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'Without Query (Mastodon)' => 'noquery',
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'With Query (GoToSocial)' => 'query',
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'Don\'t sign' => 'nosig',
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],
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'defaultValue' => 'noquery'
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],
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]];
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public function collectData()
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{
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if ($this->getInput('norep') && $this->getInput('noboost') && $this->getInput('noregular')) {
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throw new \Exception('replies, boosts, or regular statuses must be allowed');
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}
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$user = $this->fetchAP($this->getURI());
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if (!isset($user['outbox'])) {
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throw new \Exception('Unable to find the outbox');
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}
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$content = $this->fetchAP($user['outbox']);
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if (is_array($content['first'])) { // mobilizon
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$content = $content['first'];
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} else {
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$content = $this->fetchAP($content['first']);
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}
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$items = $content['orderedItems'] ?? $content['items'];
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foreach ($items as $status) {
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$item = $this->parseStatus($status);
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if ($item) {
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$this->items[] = $item;
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}
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}
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}
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protected function parseStatus($content)
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{
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$item = [];
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switch ($content['type']) {
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case 'Announce': // boost
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if ($this->getInput('noboost')) {
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return null;
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}
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// We fetch the boosted content.
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try {
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$rtContent = $this->fetchAP($content['object']);
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if (!$rtContent) {
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// Sometimes fetchAP returns null. Someone should figure out why. json_decode failure?
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break;
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}
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$rtUser = $this->loadCacheValue($rtContent['attributedTo']);
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if (!$rtUser) {
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// We fetch the author, since we cannot always assume the format of the URL.
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$user = $this->fetchAP($rtContent['attributedTo']);
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preg_match('/https?:\/\/([a-z0-9-\.]{0,})\//', $rtContent['attributedTo'], $matches);
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// We assume that the server name as indicated by the path is the actual server name,
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// since using webfinger to delegate domains is not officially supported, and it only
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// seems to work in one way.
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$rtUser = '@' . $user['preferredUsername'] . '@' . $matches[1];
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$this->saveCacheValue($rtContent['attributedTo'], $rtUser);
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}
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$item['author'] = $rtUser;
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$item['title'] = 'Shared a status by ' . $rtUser . ': ';
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$item = $this->parseObject($rtContent, $item);
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} catch (HttpException $e) {
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$item['title'] = 'Shared an unreachable status: ' . $content['object'];
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$item['content'] = $content['object'];
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$item['uri'] = $content['object'];
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}
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break;
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case 'Note': // frendica posts
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if ($this->getInput('norep') && isset($content['inReplyTo'])) {
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return null;
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}
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if ($this->getInput('noregular') && !isset($content['inReplyTo'])) {
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return null;
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}
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$item['title'] = '';
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$item['author'] = $this->getInput('canusername');
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$item = $this->parseObject($content, $item);
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break;
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case 'Create': // posts
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if ($this->getInput('norep') && isset($content['object']['inReplyTo'])) {
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return null;
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}
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if ($this->getInput('noregular') && !isset($content['object']['inReplyTo'])) {
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return null;
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}
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$item['title'] = '';
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$item['author'] = $this->getInput('canusername');
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$item = $this->parseObject($content['object'], $item);
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break;
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default:
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return null;
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}
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$item['timestamp'] = $content['published'] ?? $item['timestamp'];
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$item['uid'] = $content['id'];
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return $item;
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}
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protected function parseObject($object, $item)
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{
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// If object is a link to another object, fetch it
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if (is_string($object)) {
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$object = $this->fetchAP($object);
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}
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$item['content'] = $object['content'] ?? '';
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$strippedContent = strip_tags(str_replace('<br>', ' ', $item['content']));
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if (isset($object['name'])) {
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$item['title'] = $object['name'];
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} elseif (mb_strlen($strippedContent) > 75) {
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$contentSubstring = mb_substr($strippedContent, 0, mb_strpos(wordwrap($strippedContent, 75), "\n"));
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$item['title'] .= $contentSubstring . '...';
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} else {
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$item['title'] .= $strippedContent;
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}
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$item['uri'] = $object['id'];
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$item['timestamp'] = $object['published'];
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if (!isset($object['attachment'])) {
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return $item;
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}
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if (isset($object['attachment']['url'])) {
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// Normalize attachment (turn single attachment into array)
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$object['attachment'] = [$object['attachment']];
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}
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foreach ($object['attachment'] as $attachment) {
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// Only process REMOTE pictures (prevent xss)
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$mediaType = $attachment['mediaType'] ?? null;
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if (
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$mediaType
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&& preg_match('/^image\//', $mediaType, $match)
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&& preg_match('/^http(s|):\/\//', $attachment['url'], $match)
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) {
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$item['content'] = $item['content'] . '<br /><img ';
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if (isset($attachment['name'])) {
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$item['content'] .= sprintf('alt="%s" ', $attachment['name']);
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}
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$item['content'] .= sprintf('src="%s" />', $attachment['url']);
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}
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}
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return $item;
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}
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public function getName()
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{
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if ($this->getInput('canusername')) {
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return $this->getInput('canusername');
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}
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return parent::getName();
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}
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private function getInstance()
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{
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preg_match('/^@[a-zA-Z0-9_]+@(.+)/', $this->getInput('canusername'), $matches);
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return $matches[1];
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}
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private function getUsername()
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{
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preg_match('/^@([a-zA-Z_0-9_]+)@.+/', $this->getInput('canusername'), $matches);
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return $matches[1];
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}
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public function getURI()
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{
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if ($this->getInput('canusername')) {
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// We parse webfinger to make sure the URL is correct. This is mostly because
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// MissKey uses user ID instead of the username in the endpoint, domain delegations,
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// and also to be compatible with future ActivityPub implementations.
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$resource = 'acct:' . $this->getUsername() . '@' . $this->getInstance();
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$webfingerUrl = 'https://' . $this->getInstance() . '/.well-known/webfinger?resource=' . $resource;
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$webfingerHeader = [
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'Accept: application/jrd+json'
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];
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$webfinger = json_decode(getContents($webfingerUrl, $webfingerHeader), true);
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foreach ($webfinger['links'] as $link) {
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if ($link['type'] === 'application/activity+json') {
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return $link['href'];
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}
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}
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}
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return parent::getURI();
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}
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protected function fetchAP($url)
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{
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$d = new DateTime();
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$d->setTimezone(new DateTimeZone('GMT'));
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$date = $d->format('D, d M Y H:i:s e');
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// GoToSocial expects the query string to be included when
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// building the url to sign
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// @see https://github.com/superseriousbusiness/gotosocial/issues/107#issuecomment-1188289857
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$regex = [
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// Include query string when parsing URL
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'query' => '/https?:\/\/([a-z0-9-\.]{0,})(\/[^#]+)/',
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// Exclude query string when parsing URL
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'noquery' => '/https?:\/\/([a-z0-9-\.]{0,})(\/[^#?]+)/',
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'nosig' => '/https?:\/\/([a-z0-9-\.]{0,})(\/[^#?]+)/',
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];
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preg_match($regex[$this->getInput('signaturetype')], $url, $matches);
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$headers = [
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'Accept: application/activity+json',
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'Host: ' . $matches[1],
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'Date: ' . $date
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];
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$privateKey = $this->getOption('private_key');
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$keyId = $this->getOption('key_id');
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if ($privateKey && $keyId && $this->getInput('signaturetype') !== 'nosig') {
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$pkey = openssl_pkey_get_private('file://' . $privateKey);
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$toSign = '(request-target): get ' . $matches[2] . "\nhost: " . $matches[1] . "\ndate: " . $date;
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$result = openssl_sign($toSign, $signature, $pkey, 'RSA-SHA256');
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if ($result) {
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$sig = sprintf(
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'Signature: keyId="%s",headers="(request-target) host date",signature="%s"',
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$keyId,
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base64_encode($signature)
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);
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$headers[] = $sig;
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}
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}
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try {
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return Json::decode(getContents($url, $headers));
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} catch (\JsonException $e) {
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return null;
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}
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}
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}
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