8ed4812e00
If no accepted languages are specified Facebook will guess your language. This guess can go horribly wrong if your server does not provide origin information. This adds a context header with language information when retrieving page contents. The accepted languages are read from the list of accepted languages specified by the web browser of the requester. References #530
287 lines
8.5 KiB
PHP
287 lines
8.5 KiB
PHP
<?php
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class FacebookBridge extends BridgeAbstract {
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const MAINTAINER = 'teromene';
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const NAME = 'Facebook';
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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( 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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));
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private $authorName = '';
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public function collectData(){
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//Extract a string using start and end delimiters
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function extractFromDelimiters($string, $start, $end){
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if(strpos($string, $start) !== false){
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$section_retrieved = substr($string, strpos($string, $start) + strlen($start));
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$section_retrieved = substr($section_retrieved, 0, strpos($section_retrieved, $end));
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return $section_retrieved;
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}
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return false;
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}
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//Utility function for cleaning a Facebook link
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$unescape_fb_link = 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, '/') === 0)
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$link = self::URI . $link . '"';
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if(strpos($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="' . $link . '"';
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}
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};
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//Utility function for converting facebook emoticons
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$unescape_fb_emote = 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 $matches[0];
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};
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$html = null;
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//Handle captcha response sent by the viewer
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if (isset($_POST['captcha_response']))
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{
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if (session_status() == PHP_SESSION_NONE)
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session_start();
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if (isset($_SESSION['captcha_fields'], $_SESSION['captcha_action']))
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{
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$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]+/", "", $_POST['captcha_response']);
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$http_options = array(
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'http' => array(
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'method' => 'POST',
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'user_agent' => ini_get('user_agent'),
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'header' => array("Content-type:
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application/x-www-form-urlencoded\r\nReferer: $captcha_action\r\nCookie: noscript=1\r\n"),
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'content' => http_build_query($captcha_fields)
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),
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);
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$context = stream_context_create($http_options);
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$html = getContents($captcha_action, false, $context);
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if($html === false){
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returnServerError('Failed to submit captcha response back to Facebook');
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}
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unset($_SESSION['captcha_fields']);
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$html = str_get_html($html);
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}
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unset($_SESSION['captcha_fields']);
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unset($_SESSION['captcha_action']);
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}
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//Retrieve page contents
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if(is_null($html)){
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$http_options = array(
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'http' => array(
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'method' => 'GET',
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'user_agent' => ini_get('user_agent'),
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'header' => 'Accept-Language: ' . getEnv('HTTP_ACCEPT_LANGUAGE') . "\r\n"
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)
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);
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$context = stream_context_create($http_options);
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if(!strpos($this->getInput('u'), "/")){
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$html = getSimpleHTMLDOM(self::URI . urlencode($this->getInput('u')) . '?_fb_noscript=1',
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false,
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$context)
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or returnServerError('No results for this query.');
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} else {
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$html = getSimpleHTMLDOM(self::URI . 'pages/' . $this->getInput('u') . '?_fb_noscript=1',
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false,
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$context)
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or returnServerError('No results for this query.');
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}
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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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{
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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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$captcha_fields = array();
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foreach ($captcha->find('input, button') as $input)
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$captcha_fields[$input->name] = $input->value;
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$_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($captcha->find('img', 0)->src));
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header('HTTP/1.1 500 ' . Http::getMessageForCode(500));
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header('Content-Type: text/html');
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$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($message);
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}
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//No captcha? We can carry on retrieving page contents :)
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$element = $html
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->find('#pagelet_timeline_main_column')[0]
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->children(0)
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->children(0)
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->children(0)
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->next_sibling()
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->children(0);
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if(isset($element)){
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$author = str_replace(' | Facebook', '', $html->find('title#pageTitle', 0)->innertext);
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$profilePic = 'https://graph.facebook.com/'
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. $this->getInput('u')
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. '/picture?width=200&height=200';
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$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($cell);
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}
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foreach($posts as $post){
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$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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$content);
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//Remove html nodes, keep only img, links, basic formatting
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$content = strip_tags($content, '<a><img><i><u><br><p>');
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//Adapt link hrefs: convert relative links into absolute links and bypass external link redirection
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$content = preg_replace_callback('/ href=\"([^"]+)\"/i', $unescape_fb_link, $content);
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//Clean useless html tag properties and fix link closing tags
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foreach (array(
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'onmouseover',
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'onclick',
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'target',
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'ajaxify',
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'tabindex',
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'class',
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'style',
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'data-[^=]*',
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'aria-[^=]*',
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'role',
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'rel',
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'id') as $property_name)
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$content = preg_replace('/ ' . $property_name . '=\"[^"]*\"/i', '', $content);
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$content = preg_replace('/<\/a [^>]+>/i', '</a>', $content);
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//Convert textual representation of emoticons eg
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//"<i><u>smile emoticon</u></i>" back to ASCII emoticons eg ":)"
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$content = preg_replace_callback(
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'/<i><u>([^ <>]+) ([^<>]+)<\/u><\/i>/i',
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$unescape_fb_emote,
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$content
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);
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//Retrieve date of the post
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$date = $post->find("abbr")[0];
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if(isset($date) && $date->hasAttribute('data-utime')){
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$date = $date->getAttribute('data-utime');
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} else {
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$date = 0;
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}
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//Build title from username and content
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$title = $author;
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if(strlen($title) > 24)
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$title = substr($title, 0, strpos(wordwrap($title, 24), "\n")) . '...';
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$title = $title . ' | ' . strip_tags($content);
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if(strlen($title) > 64)
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$title = substr($title, 0, strpos(wordwrap($title, 64), "\n")) . '...';
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//Build and add final item
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$item['uri'] = self::URI . $post->find('abbr')[0]->parent()->getAttribute('href');
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$item['content'] = $content;
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$item['title'] = $title;
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$item['author'] = $author;
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$item['timestamp'] = $date;
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$this->items[] = $item;
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}
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}
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}
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}
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}
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public function getName(){
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if(!empty($this->authorName)){
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return isset($this->extraInfos['name']) ? $this->extraInfos['name'] : $this->authorName
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. ' - Facebook Bridge';
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}
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return parent::getName();
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}
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}
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