rss-bridge/bridges/FacebookBridge.php

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<?php
class FacebookBridge extends BridgeAbstract{
public function loadMetadatas() {
$this->maintainer = "teromene";
$this->name = "Facebook";
$this->uri = "http://www.facebook.com/";
$this->description = "Input a page title or a profile log. For a profile log, please insert the parameter as follow : myExamplePage/132621766841117";
$this->update = "31/03/2016";
$this->parameters[] =
'[
{
"name" : "Username",
"identifier" : "u",
"required" : "required"
}
]';
}
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public function collectData(array $param) {
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//Extract a string using start and end delimiters
function ExtractFromDelimiters($string, $start, $end) {
if (strpos($string, $start) !== false) {
$section_retrieved = substr($string, strpos($string, $start) + strlen($start));
$section_retrieved = substr($section_retrieved, 0, strpos($section_retrieved, $end));
return $section_retrieved;
} return false;
}
//Utility function for cleaning a Facebook link
$unescape_fb_link = function ($matches) {
if (is_array($matches) && count($matches) > 1) {
$link = $matches[1];
if (strpos($link, '/') === 0)
$link = 'https://www.facebook.com'.$link.'"';
if (strpos($link, 'facebook.com/l.php?u=') !== false)
$link = urldecode(ExtractFromDelimiters($link, 'facebook.com/l.php?u=', '&'));
return ' href="'.$link.'"';
}
};
//Utility function for converting facebook emoticons
$unescape_fb_emote = function ($matches) {
static $facebook_emoticons = array(
'smile' => ':)',
'frown' => ':(',
'tongue' => ':P',
'grin' => ':D',
'gasp' => ':O',
'wink' => ';)',
'pacman' => ':<',
'grumpy' => '>_<',
'unsure' => ':/',
'cry' => ':\'(',
'kiki' => '^_^',
'glasses' => '8-)',
'sunglasses' => 'B-)',
'heart' => '<3',
'devil' => ']:D',
'angel' => '0:)',
'squint' => '-_-',
'confused' => 'o_O',
'upset' => 'xD',
'colonthree' => ':3',
'like' => '&#x1F44D;');
$len = count($matches);
if ($len > 1)
for ($i = 1; $i < $len; $i++)
foreach ($facebook_emoticons as $name => $emote)
if ($matches[$i] === $name)
return $emote;
return $matches[0];
};
$html = null;
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//Handle captcha response sent by the viewer
if (isset($_POST['captcha_response']))
{
if (session_status() == PHP_SESSION_NONE)
session_start();
if (isset($_SESSION['captcha_fields'], $_SESSION['captcha_action']))
{
$captcha_action = $_SESSION['captcha_action'];
$captcha_fields = $_SESSION['captcha_fields'];
$captcha_fields['captcha_response'] = preg_replace("/[^a-zA-Z0-9]+/", "", $_POST['captcha_response']);
$http_options = array(
'http' => array(
'method' => 'POST',
'user_agent'=> ini_get('user_agent'),
'header'=>array("Content-type: application/x-www-form-urlencoded\r\nReferer: $captcha_action\r\nCookie: noscript=1\r\n"),
'content' => http_build_query($captcha_fields),
),
);
$context = stream_context_create($http_options);
$html = file_get_contents($captcha_action, false, $context);
if ($html === FALSE) { $this->returnError('Failed to submit captcha response back to Facebook', 500); }
unset($_SESSION['captcha_fields']);
$html = str_get_html($html);
}
unset($_SESSION['captcha_fields']);
unset($_SESSION['captcha_action']);
}
//Retrieve page contents
if (is_null($html)) {
if (isset($param['u'])) {
if (!strpos($param['u'], "/")) {
$html = $this->file_get_html('https://www.facebook.com/'.urlencode($param['u']).'?_fb_noscript=1') or $this->returnError('No results for this query.', 404);
} else {
$html = $this->file_get_html('https://www.facebook.com/pages/'.$param['u'].'?_fb_noscript=1') or $this->returnError('No results for this query.', 404);
}
} else {
$this->returnError('You must specify a Facebook username.', 400);
}
}
//Handle captcha form?
$captcha = $html->find('div.captcha_interstitial', 0);
if (!is_null($captcha))
{
//Save form for submitting after getting captcha response
if (session_status() == PHP_SESSION_NONE)
session_start();
$captcha_fields = array();
foreach ($captcha->find('input, button') as $input)
$captcha_fields[$input->name] = $input->value;
$_SESSION['captcha_fields'] = $captcha_fields;
$_SESSION['captcha_action'] = 'https://www.facebook.com'.$captcha->find('form', 0)->action;
//Show captcha filling form to the viewer, proxying the captcha image
$img = base64_encode(file_get_contents($captcha->find('img', 0)->src));
header('HTTP/1.1 500 '.Http::getMessageForCode(500));
header('Content-Type: text/html');
die('<form method="post" action="?'.$_SERVER['QUERY_STRING'].'">'
.'<h2>Facebook captcha challenge</h2>'
.'<p>Unfortunately, rss-bridge cannot fetch the requested page.<br />'
.'Facebook wants rss-bridge to resolve the following captcha:</p>'
.'<p><img src="data:image/png;base64,'.$img.'" /></p>'
.'<p><b>Response:</b> <input name="captcha_response" placeholder="please fill in" />'
.'<input type="submit" value="Submit!" /></p>'
.'</form>');
}
//No captcha? We can carry on retrieving page contents :)
$element = $html->find('#pagelet_timeline_main_column')[0]->children(0)->children(0)->children(0)->next_sibling()->children(0);
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if(isset($element)) {
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$author = str_replace(' | Facebook', '', $html->find('title#pageTitle', 0)->innertext);
$profilePic = 'https://graph.facebook.com/'.$param['u'].'/picture?width=200&amp;height=200';
$this->name = $author;
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foreach($element->children() as $post) {
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$item = new \Item();
if (count($post->find('abbr')) > 0) {
//Retrieve post contents
$content = preg_replace('/(?i)><div class=\"clearfix([^>]+)>(.+?)div\ class=\"userContent\"/i', '', $post);
$content = preg_replace('/(?i)><div class=\"_59tj([^>]+)>(.+?)<\/div><\/div><a/i', '', $content);
$content = preg_replace('/(?i)><div class=\"_3dp([^>]+)>(.+?)div\ class=\"[^u]+userContent\"/i', '', $content);
$content = preg_replace('/(?i)><div class=\"_4l5([^>]+)>(.+?)<\/div>/i', '', $content);
//Remove html nodes, keep only img, links, basic formatting
$content = strip_tags($content,'<a><img><i><u>');
//Adapt link hrefs: convert relative links into absolute links and bypass external link redirection
$content = preg_replace_callback('/ href=\"([^"]+)\"/i', $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);
//Convert textual representation of emoticons eg "<i><u>smile emoticon</u></i>" back to ASCII emoticons eg ":)"
$content = preg_replace_callback('/<i><u>([^ <>]+) ([^<>]+)<\/u><\/i>/i', $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")).'...';
//Use first image as thumbnail if available, or profile pic fallback
$thumbnail = $post->find('img', 1);
if (is_object($thumbnail))
$thumbnail = $thumbnail->src;
else $thumbnail = $profilePic;
//Build and add final item
$item->uri = 'https://facebook.com'.$post->find('abbr')[0]->parent()->getAttribute('href');
$item->thumbnailUri = $thumbnail;
$item->content = $content;
$item->title = $title;
$item->author = $author;
$item->timestamp = $date;
$this->items[] = $item;
}
}
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}
}
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public function setDatas(array $param){
if (isset($param['captcha_response']))
unset($param['captcha_response']);
parent::setDatas($param);
}
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public function getName() {
return (isset($this->name) ? $this->name.' - ' : '').'Facebook Bridge';
}
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public function getURI() {
return 'http://facebook.com';
}
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public function getCacheDuration() {
return 300; // 5 minutes
}
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}