fcc9f9fd61
The URI "https://facebook.com/username?_fb_noscript=1" returns two posts per user. Some profiles, however, are very active, causing the bridge to miss items if more than two posts are send within the cache duration (5 minutes). The alternative suggested in #669 is to use a different URI: "https://facebook.com/pg/username/posts?_fb_noscript=1" While the contents of this URI essentially look the same when viewed in a browser, it actually returns more than 10 posts depending on the profile. References #669
642 lines
16 KiB
PHP
642 lines
16 KiB
PHP
<?php
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class FacebookBridge extends BridgeAbstract {
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const MAINTAINER = 'teromene, logmanoriginal';
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const NAME = 'Facebook Bridge';
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const URI = 'https://www.facebook.com/';
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const CACHE_TIMEOUT = 300; // 5min
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const DESCRIPTION = 'Input a page title or a profile log. For a profile log,
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please insert the parameter as follow : myExamplePage/132621766841117';
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const PARAMETERS = array(
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'User' => array(
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'u' => array(
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'name' => 'Username',
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'required' => true
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),
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'media_type' => array(
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'name' => 'Media type',
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'type' => 'list',
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'required' => false,
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'values' => array(
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'All' => 'all',
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'Video' => 'video',
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'No Video' => 'novideo'
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),
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'defaultValue' => 'all'
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),
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'skip_reviews' => array(
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'name' => 'Skip reviews',
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'type' => 'checkbox',
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'required' => false,
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'defaultValue' => false,
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'title' => 'Feed includes reviews when checked'
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)
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),
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'Group' => array(
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'g' => array(
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'name' => 'Group',
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'type' => 'text',
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'required' => true,
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'exampleValue' => 'https://www.facebook.com/groups/743149642484225',
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'title' => 'Insert group name or facebook group URL'
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)
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)
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);
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private $authorName = '';
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private $groupName = '';
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public function getName(){
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switch($this->queriedContext) {
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case 'User':
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if(!empty($this->authorName)) {
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return isset($this->extraInfos['name']) ? $this->extraInfos['name'] : $this->authorName
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. ' - ' . static::NAME;
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}
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break;
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case 'Group':
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if(!empty($this->groupName)) {
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return $this->groupName . ' - ' . static::NAME;
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}
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break;
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}
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return parent::getName();
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}
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public function getURI() {
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$uri = self::URI;
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switch($this->queriedContext) {
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case 'Group':
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// Discover groups via https://www.facebook.com/groups/
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// Example group: https://www.facebook.com/groups/sailors.worldwide
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$uri .= 'groups/' . $this->sanitizeGroup(filter_var($this->getInput('g'), FILTER_SANITIZE_URL));
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break;
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case 'User':
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// Example user 1: https://www.facebook.com/artetv/
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// Example user 2: artetv
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$user = $this->sanitizeUser($this->getInput('u'));
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if(!strpos($user, '/')) {
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$uri .= '/pg/' . urlencode($user) . '/posts';
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} else {
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$uri .= 'pages/' . $user;
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}
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break;
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}
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// Request the mobile version to reduce page size (no javascript)
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// More information: https://stackoverflow.com/a/11103592
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return $uri .= '?_fb_noscript=1';
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}
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public function collectData() {
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switch($this->queriedContext) {
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case 'Group':
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$this->collectGroupData();
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break;
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case 'User':
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$this->collectUserData();
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break;
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default:
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returnClientError('Unknown context: "' . $this->queriedContext . '"!');
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}
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}
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#region Group
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private function collectGroupData() {
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$header = array('Accept-Language: ' . getEnv('HTTP_ACCEPT_LANGUAGE') . "\r\n");
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$html = getSimpleHTMLDOM($this->getURI(), $header)
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or returnServerError('Failed loading facebook page: ' . $this->getURI());
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if(!$this->isPublicGroup($html)) {
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returnClientError('This group is not public! RSS-Bridge only supports public groups!');
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}
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defaultLinkTo($html, substr(self::URI, 0, strlen(self::URI) - 1));
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$this->groupName = $this->extractGroupName($html);
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$posts = $html->find('div.userContentWrapper')
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or returnServerError('Failed finding posts!');
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foreach($posts as $post) {
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$item = array();
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$item['uri'] = $this->extractGroupURI($post);
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$item['title'] = $this->extractGroupTitle($post);
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$item['author'] = $this->extractGroupAuthor($post);
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$item['content'] = $this->extractGroupContent($post);
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$item['timestamp'] = $this->extractGroupTimestamp($post);
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$item['enclosures'] = $this->extractGroupEnclosures($post);
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$this->items[] = $item;
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}
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}
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private function sanitizeGroup($group) {
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if(filter_var(
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$group,
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FILTER_VALIDATE_URL,
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FILTER_FLAG_HOST_REQUIRED | FILTER_FLAG_PATH_REQUIRED)) {
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// User provided a URL
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$urlparts = parse_url($group);
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if($urlparts['host'] !== parse_url(self::URI)['host']
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&& 'www.' . $urlparts['host'] !== parse_url(self::URI)['host']) {
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returnClientError('The host you provided is invalid! Received "'
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. $urlparts['host']
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. '", expected "'
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. parse_url(self::URI)['host']
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. '"!');
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}
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return explode('/', $urlparts['path'])[2];
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} elseif(strpos($group, '/') !== false) {
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returnClientError('The group you provided is invalid: ' . $group);
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} else {
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return $group;
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}
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}
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private function isPublicGroup($html) {
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// Facebook redirects to the groups about page for non-public groups
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$about = $html->find('#pagelet_group_about', 0);
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return !($about);
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}
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private function extractGroupName($html) {
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$ogtitle = $html->find('meta[property="og:title"]', 0)
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or returnServerError('Unable to find group title!');
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return htmlspecialchars_decode($ogtitle->content, ENT_QUOTES);
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}
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private function extractGroupURI($post) {
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$elements = $post->find('a')
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or returnServerError('Unable to find URI!');
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foreach($elements as $anchor) {
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// Find the one that is a permalink
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if(strpos($anchor->href, 'permalink') !== false) {
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return $anchor->href;
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}
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}
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return null;
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}
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private function extractGroupContent($post) {
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$content = $post->find('div.userContent', 0)
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or returnServerError('Unable to find user content!');
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return $content->innertext . $content->next_sibling()->innertext;
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}
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private function extractGroupTimestamp($post) {
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$element = $post->find('abbr[data-utime]', 0)
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or returnServerError('Unable to find timestamp!');
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return $element->getAttribute('data-utime');
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}
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private function extractGroupAuthor($post) {
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$element = $post->find('img', 0)
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or returnServerError('Unable to find author information!');
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return $element->{'aria-label'};
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}
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private function extractGroupEnclosures($post) {
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$elements = $post->find('div.userContent', 0)->next_sibling()->find('img');
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$enclosures = array();
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foreach($elements as $enclosure) {
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$enclosures[] = $enclosure->src;
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}
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return empty($enclosures) ? null : $enclosures;
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}
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private function extractGroupTitle($post) {
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$element = $post->find('h5', 0)
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or returnServerError('Unable to find title!');
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if(strpos($element->plaintext, 'shared') === false) {
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$content = strip_tags($this->extractGroupContent($post));
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return $this->extractGroupAuthor($post)
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. ' posted: '
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. substr(
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$content,
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0,
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strpos(wordwrap($content, 64), "\n")
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)
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. '...';
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}
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return $element->plaintext;
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}
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#endregion (Group)
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#region User
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/**
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* Checks if $user is a valid username or URI and returns the username
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*/
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private function sanitizeUser($user) {
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if (filter_var($user, FILTER_VALIDATE_URL)) {
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$urlparts = parse_url($user);
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if($urlparts['host'] !== parse_url(self::URI)['host']) {
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returnClientError('The host you provided is invalid! Received "'
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. $urlparts['host']
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. '", expected "'
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. parse_url(self::URI)['host']
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. '"!');
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}
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if(!array_key_exists('path', $urlparts)
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|| $urlparts['path'] === '/') {
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returnClientError('The URL you provided doesn\'t contain the user name!');
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}
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return explode('/', $urlparts['path'])[1];
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} else {
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// First character cannot be a forward slash
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if(strpos($user, '/') === 0) {
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returnClientError('Remove leading slash "/" from the username!');
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}
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return $user;
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}
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}
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/**
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* Bypass external link redirection
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*/
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private function unescape_fb_link($content){
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return preg_replace_callback('/ href=\"([^"]+)\"/i', function($matches){
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if(is_array($matches) && count($matches) > 1) {
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$link = $matches[1];
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if(strpos($link, 'facebook.com/l.php?u=') !== false)
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$link = urldecode(extractFromDelimiters($link, 'facebook.com/l.php?u=', '&'));
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return ' href="' . $link . '"';
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}
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}, $content);
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}
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/**
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* Convert textual representation of emoticons back to ASCII emoticons.
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* i.e. "<i><u>smile emoticon</u></i>" => ":)"
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*/
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private function unescape_fb_emote($content){
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return preg_replace_callback('/<i><u>([^ <>]+) ([^<>]+)<\/u><\/i>/i', function($matches){
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static $facebook_emoticons = array(
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'smile' => ':)',
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'frown' => ':(',
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'tongue' => ':P',
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'grin' => ':D',
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'gasp' => ':O',
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'wink' => ';)',
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'pacman' => ':<',
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'grumpy' => '>_<',
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'unsure' => ':/',
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'cry' => ':\'(',
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'kiki' => '^_^',
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'glasses' => '8-)',
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'sunglasses' => 'B-)',
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'heart' => '<3',
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'devil' => ']:D',
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'angel' => '0:)',
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'squint' => '-_-',
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'confused' => 'o_O',
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'upset' => 'xD',
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'colonthree' => ':3',
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'like' => '👍');
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$len = count($matches);
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if ($len > 1)
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for ($i = 1; $i < $len; $i++)
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foreach ($facebook_emoticons as $name => $emote)
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if ($matches[$i] === $name)
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return $emote;
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return $matches[0];
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}, $content);
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}
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/**
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* Returns the captcha message for the given captcha
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*/
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private function returnCaptchaMessage($captcha) {
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// Save form for submitting after getting captcha response
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if (session_status() == PHP_SESSION_NONE) {
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session_start();
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}
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$captcha_fields = array();
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foreach ($captcha->find('input, button') as $input) {
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$captcha_fields[$input->name] = $input->value;
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}
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$_SESSION['captcha_fields'] = $captcha_fields;
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$_SESSION['captcha_action'] = $captcha->find('form', 0)->action;
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// Show captcha filling form to the viewer, proxying the captcha image
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$img = base64_encode(getContents($captcha->find('img', 0)->src));
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http_response_code(500);
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header('Content-Type: text/html');
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$message = <<<EOD
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<form method="post" action="?{$_SERVER['QUERY_STRING']}">
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<h2>Facebook captcha challenge</h2>
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<p>Unfortunately, rss-bridge cannot fetch the requested page.<br />
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Facebook wants rss-bridge to resolve the following captcha:</p>
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<p><img src="data:image/png;base64,{$img}" /></p>
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<p><b>Response:</b> <input name="captcha_response" placeholder="please fill in" />
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<input type="submit" value="Submit!" /></p>
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</form>
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EOD;
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die($message);
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}
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/**
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* Checks if a capture response was received and tries to load the contents
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* @return mixed null if no capture response was received, simplhtmldom document otherwise
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*/
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private function handleCaptchaResponse() {
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if (isset($_POST['captcha_response'])) {
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if (session_status() == PHP_SESSION_NONE)
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session_start();
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if (isset($_SESSION['captcha_fields'], $_SESSION['captcha_action'])) {
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$captcha_action = $_SESSION['captcha_action'];
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$captcha_fields = $_SESSION['captcha_fields'];
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$captcha_fields['captcha_response'] = preg_replace('/[^a-zA-Z0-9]+/', '', $_POST['captcha_response']);
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$header = array(
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'Content-type: application/x-www-form-urlencoded',
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'Referer: ' . $captcha_action,
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'Cookie: noscript=1'
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);
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$opts = array(
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CURLOPT_POST => 1,
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CURLOPT_POSTFIELDS => http_build_query($captcha_fields)
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);
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$html = getSimpleHTMLDOM($captcha_action, $header, $opts)
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or returnServerError('Failed to submit captcha response back to Facebook');
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return $html;
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}
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unset($_SESSION['captcha_fields']);
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unset($_SESSION['captcha_action']);
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}
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return null;
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}
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private function collectUserData(){
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$html = $this->handleCaptchaResponse();
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// Retrieve page contents
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if(is_null($html)) {
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$header = array('Accept-Language: ' . getEnv('HTTP_ACCEPT_LANGUAGE'));
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$html = getSimpleHTMLDOM($this->getURI(), $header)
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or returnServerError('No results for this query.');
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}
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// Handle captcha form?
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$captcha = $html->find('div.captcha_interstitial', 0);
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if (!is_null($captcha)) {
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$this->returnCaptchaMessage($captcha);
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}
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// No captcha? We can carry on retrieving page contents :)
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// First, we check wether the page is public or not
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$loginForm = $html->find('._585r', 0);
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if($loginForm != null) {
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returnServerError('You must be logged in to view this page. This is not supported by RSS-Bridge.');
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}
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$html = defaultLinkTo($html, self::URI);
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$element = $html
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->find('#pagelet_timeline_main_column')[0]
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->children(0)
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->children(0)
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->next_sibling()
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->children(0);
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if(isset($element)) {
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$author = str_replace(' | Facebook', '', $html->find('title#pageTitle', 0)->innertext);
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$profilePic = $html->find('meta[property="og:image"]', 0)->content;
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$this->authorName = $author;
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foreach($element->children() as $cell) {
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// Manage summary posts
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if(strpos($cell->class, '_3xaf') !== false) {
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$posts = $cell->children();
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} else {
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$posts = array($cell);
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}
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// Optionally skip reviews
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if($this->getInput('skip_reviews')
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&& !is_null($cell->find('#review_composer_container', 0))) {
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continue;
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}
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foreach($posts as $post) {
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// Check media type
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switch($this->getInput('media_type')) {
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case 'all': break;
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case 'video':
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if(empty($post->find('[aria-label=Video]'))) continue 2;
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break;
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case 'novideo':
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if(!empty($post->find('[aria-label=Video]'))) continue 2;
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break;
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default: break;
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}
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$item = array();
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if(count($post->find('abbr')) > 0) {
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//Retrieve post contents
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$content = preg_replace(
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'/(?i)><div class=\"clearfix([^>]+)>(.+?)div\ class=\"userContent\"/i',
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'',
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$post);
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$content = preg_replace(
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'/(?i)><div class=\"_59tj([^>]+)>(.+?)<\/div><\/div><a/i',
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'',
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$content);
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$content = preg_replace(
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'/(?i)><div class=\"_3dp([^>]+)>(.+?)div\ class=\"[^u]+userContent\"/i',
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'',
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$content);
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$content = preg_replace(
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'/(?i)><div class=\"_4l5([^>]+)>(.+?)<\/div>/i',
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'',
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$content);
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// Remove "SpSonsSoriSsés"
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$content = preg_replace(
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'/(?iU)<a [^>]+ href="#" role="link" [^>}]+>.+<\/a>/iU',
|
|
'',
|
|
$content);
|
|
|
|
// Remove html nodes, keep only img, links, basic formatting
|
|
$content = strip_tags($content, '<a><img><i><u><br><p>');
|
|
|
|
$content = $this->unescape_fb_link($content);
|
|
|
|
// Clean useless html tag properties and fix link closing tags
|
|
foreach (array(
|
|
'onmouseover',
|
|
'onclick',
|
|
'target',
|
|
'ajaxify',
|
|
'tabindex',
|
|
'class',
|
|
'style',
|
|
'data-[^=]*',
|
|
'aria-[^=]*',
|
|
'role',
|
|
'rel',
|
|
'id') as $property_name) {
|
|
$content = preg_replace('/ ' . $property_name . '=\"[^"]*\"/i', '', $content);
|
|
}
|
|
|
|
$content = preg_replace('/<\/a [^>]+>/i', '</a>', $content);
|
|
|
|
$this->unescape_fb_emote($content);
|
|
|
|
// Retrieve date of the post
|
|
$date = $post->find('abbr')[0];
|
|
|
|
if(isset($date) && $date->hasAttribute('data-utime')) {
|
|
$date = $date->getAttribute('data-utime');
|
|
} else {
|
|
$date = 0;
|
|
}
|
|
|
|
// Build title from username and content
|
|
$title = $author;
|
|
|
|
if(strlen($title) > 24)
|
|
$title = substr($title, 0, strpos(wordwrap($title, 24), "\n")) . '...';
|
|
|
|
$title = $title . ' | ' . strip_tags($content);
|
|
|
|
if(strlen($title) > 64)
|
|
$title = substr($title, 0, strpos(wordwrap($title, 64), "\n")) . '...';
|
|
|
|
$uri = $post->find('abbr')[0]->parent()->getAttribute('href');
|
|
|
|
if (false !== strpos($uri, '?')) {
|
|
$uri = substr($uri, 0, strpos($uri, '?'));
|
|
}
|
|
|
|
//Build and add final item
|
|
$item['uri'] = htmlspecialchars_decode($uri);
|
|
$item['content'] = htmlspecialchars_decode($content);
|
|
$item['title'] = $title;
|
|
$item['author'] = $author;
|
|
$item['timestamp'] = $date;
|
|
|
|
if(strpos($item['content'], '<img') === false) {
|
|
$item['enclosures'] = array($profilePic);
|
|
}
|
|
|
|
$this->items[] = $item;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endregion (User)
|
|
|
|
}
|