rss-bridge/bridges/FacebookBridge.php
logmanoriginal 8ed4812e00 [FacebookBridge] Add requester languages to HTTP header
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
2017-05-07 13:27:37 +02:00

286 lines
8.5 KiB
PHP

<?php
class FacebookBridge extends BridgeAbstract {
const MAINTAINER = 'teromene';
const NAME = 'Facebook';
const URI = 'https://www.facebook.com/';
const CACHE_TIMEOUT = 300; // 5min
const DESCRIPTION = 'Input a page title or a profile log. For a profile log,
please insert the parameter as follow : myExamplePage/132621766841117';
const PARAMETERS = array( array(
'u' => array(
'name' => 'Username',
'required' => true
)
));
private $authorName = '';
public function collectData(){
//Extract a string using start and end delimiters
function extractFromDelimiters($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 = self::URI . $link . '"';
if(strpos($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];
};
$html = null;
//Handle captcha response sent by the viewer
if (isset($_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);
$html = getContents($captcha_action, false, $context);
if($html === false){
returnServerError('Failed to submit captcha response back to Facebook');
}
unset($_SESSION['captcha_fields']);
$html = str_get_html($html);
}
unset($_SESSION['captcha_fields']);
unset($_SESSION['captcha_action']);
}
//Retrieve page contents
if(is_null($html)){
$http_options = array(
'http' => array(
'method' => 'GET',
'user_agent' => ini_get('user_agent'),
'header' => 'Accept-Language: ' . getEnv('HTTP_ACCEPT_LANGUAGE') . "\r\n"
)
);
$context = stream_context_create($http_options);
if(!strpos($this->getInput('u'), "/")){
$html = getSimpleHTMLDOM(self::URI . urlencode($this->getInput('u')) . '?_fb_noscript=1',
false,
$context)
or returnServerError('No results for this query.');
} else {
$html = getSimpleHTMLDOM(self::URI . 'pages/' . $this->getInput('u') . '?_fb_noscript=1',
false,
$context)
or returnServerError('No results for this query.');
}
}
//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'] = $captcha->find('form', 0)->action;
//Show captcha filling form to the viewer, proxying the captcha image
$img = base64_encode(getContents($captcha->find('img', 0)->src));
header('HTTP/1.1 500 ' . Http::getMessageForCode(500));
header('Content-Type: text/html');
$message = <<<EOD
<form method="post" action="?{$_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,{$img}" /></p>
<p><b>Response:</b> <input name="captcha_response" placeholder="please fill in" />
<input type="submit" value="Submit!" /></p>
</form>
EOD;
die($message);
}
//No captcha? We can carry on retrieving page contents :)
$element = $html
->find('#pagelet_timeline_main_column')[0]
->children(0)
->children(0)
->children(0)
->next_sibling()
->children(0);
if(isset($element)){
$author = str_replace(' | Facebook', '', $html->find('title#pageTitle', 0)->innertext);
$profilePic = 'https://graph.facebook.com/'
. $this->getInput('u')
. '/picture?width=200&amp;height=200';
$this->authorName = $author;
foreach($element->children() as $cell){
// Manage summary posts
if(strpos($cell->class, '_3xaf') !== false){
$posts = $cell->children();
} else {
$posts = array($cell);
}
foreach($posts as $post){
$item = array();
if(count($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><br><p>');
//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")) . '...';
//Build and add final item
$item['uri'] = self::URI . $post->find('abbr')[0]->parent()->getAttribute('href');
$item['content'] = $content;
$item['title'] = $title;
$item['author'] = $author;
$item['timestamp'] = $date;
$this->items[] = $item;
}
}
}
}
}
public function getName(){
if(!empty($this->authorName)){
return isset($this->extraInfos['name']) ? $this->extraInfos['name'] : $this->authorName
. ' - Facebook Bridge';
}
return parent::getName();
}
}