[FacebookBridge] Optimize for readability
This commit is contained in:
logmanoriginal
parent
93e7ea9fea
commit
e1c4914b1c
1 changed files with 221 additions and 158 deletions
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@ -2,7 +2,7 @@
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class FacebookBridge extends BridgeAbstract {
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const MAINTAINER = 'teromene, logmanoriginal';
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const NAME = 'Facebook';
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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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@ -47,17 +47,56 @@ class FacebookBridge extends BridgeAbstract {
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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 .= urlencode($user);
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} else {
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$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 $uri .= '?_fb_noscript=1';
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}
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@ -249,24 +288,69 @@ class FacebookBridge extends BridgeAbstract {
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}
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#endregion
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#endregion (Group)
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private function collectUserData(){
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#region User
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//Utility function for cleaning a Facebook link
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$unescape_fb_link = function($matches){
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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, '/') === 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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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 $facebook_emoticons = array(
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'smile' => ':)',
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'frown' => ':(',
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@ -289,126 +373,126 @@ class FacebookBridge extends BridgeAbstract {
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'upset' => 'xD',
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'colonthree' => ':3',
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'like' => '👍');
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$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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}, $content);
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}
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$html = null;
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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($captcha) {
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// Save form for submitting after getting captcha response
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if (session_status() == PHP_SESSION_NONE) {
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session_start();
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}
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//Handle captcha response sent by the viewer
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$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("Content-type:
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application/x-www-form-urlencoded\r\nReferer: $captcha_action\r\nCookie: noscript=1\r\n");
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$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 = getContents($captcha_action, $header, $opts);
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$html = getSimpleHTMLDOM($captcha_action, $header, $opts)
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or returnServerError('Failed to submit captcha response back to Facebook');
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if($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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return $html;
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}
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unset($_SESSION['captcha_fields']);
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unset($_SESSION['captcha_action']);
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}
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//Retrieve page contents
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return null;
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}
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private function collectUserData(){
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$html = $this->handleCaptchaResponse();
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// Retrieve page contents
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if(is_null($html)) {
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$header = array('Accept-Language: ' . getEnv('HTTP_ACCEPT_LANGUAGE') . "\r\n");
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// Check if the user provided a fully qualified URL
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if (filter_var($this->getInput('u'), FILTER_VALIDATE_URL)) {
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$header = array('Accept-Language: ' . getEnv('HTTP_ACCEPT_LANGUAGE'));
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$urlparts = parse_url($this->getInput('u'));
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if($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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|| $urlparts['path'] === '/') {
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returnClientError('The URL you provided doesn\'t contain the user name!');
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}
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$user = explode('/', $urlparts['path'])[1];
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$html = getSimpleHTMLDOM(self::URI . urlencode($user) . '?_fb_noscript=1', $header)
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$html = getSimpleHTMLDOM($this->getURI(), $header)
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or returnServerError('No results for this query.');
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} else {
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// First character cannot be a forward slash
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if(strpos($this->getInput('u'), '/') === 0) {
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returnClientError('Remove leading slash "/" from the username!');
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}
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if(!strpos($this->getInput('u'), '/')) {
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$html = getSimpleHTMLDOM(self::URI . urlencode($this->getInput('u')) . '?_fb_noscript=1', $header)
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or returnServerError('No results for this query.');
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} else {
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$html = getSimpleHTMLDOM(self::URI . 'pages/' . $this->getInput('u') . '?_fb_noscript=1', $header)
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or returnServerError('No results for this query.');
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}
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}
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}
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//Handle captcha form?
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// Handle captcha form?
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$captcha = $html->find('div.captcha_interstitial', 0);
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if (!is_null($captcha)) {
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//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($captcha->find('img', 0)->src));
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http_response_code(500);
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header('Content-Type: text/html');
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$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($message);
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if (!is_null($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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// 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 = $html
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->find('#pagelet_timeline_main_column')[0]
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->children(0)
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@ -419,12 +503,9 @@ EOD;
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if(isset($element)) {
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defaultLinkTo($element, self::URI);
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$author = str_replace(' | Facebook', '', $html->find('title#pageTitle', 0)->innertext);
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$profilePic = 'https://graph.facebook.com/'
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. $this->getInput('u')
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. '/picture?width=200&height=200#.image';
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$profilePic = $html->find('meta[property="og:image"]', 0)->content;
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$this->authorName = $author;
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@ -480,19 +561,18 @@ EOD;
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'',
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$content);
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//Remove "SpSonsSoriSsés"
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// Remove "SpSonsSoriSsés"
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$content = preg_replace(
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'/(?iU)<a [^>]+ href="#" role="link" [^>}]+>.+<\/a>/iU',
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'',
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$content);
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//Remove html nodes, keep only img, links, basic formatting
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// 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, $content);
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$content = $this->unescape_fb_link($content);
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//Clean useless html tag properties and fix link closing tags
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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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@ -505,31 +585,31 @@ EOD;
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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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'id') as $property_name) {
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$content = preg_replace('/ ' . $property_name . '=\"[^"]*\"/i', '', $content);
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}
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$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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$this->unescape_fb_emote($content);
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//Retrieve date of the post
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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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// 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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@ -545,8 +625,10 @@ EOD;
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$item['title'] = $title;
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$item['author'] = $author;
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$item['timestamp'] = $date;
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if(strpos($item['content'], '<img') === false)
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if(strpos($item['content'], '<img') === false) {
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$item['enclosures'] = array($profilePic);
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}
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$this->items[] = $item;
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}
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@ -555,25 +637,6 @@ EOD;
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}
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}
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public function getName(){
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#endregion (User)
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switch($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'] : $this->authorName
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. ' - Facebook Bridge';
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}
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break;
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case 'Group':
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if(!empty($this->groupName)) {
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return $this->groupName . ' - Facebook Bridge';
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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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}
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