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<?php
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use p3k\XRay\Formats;
class Parse {
public $http;
public $mc;
private $_cacheTime = 120;
private $_pretty = false;
public static function useragent() {
return 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36 XRay/1.0.0 ('.\Config::$base.')';
}
public function __construct() {
$this->http = new p3k\HTTP(self::useragent());
if(Config::$cache && class_exists('Memcache')) {
$this->mc = new Memcache();
$this->mc->addServer('127.0.0.1');
}
}
public static function debug($msg, $header='X-Parse-Debug') {
syslog(LOG_INFO, $msg);
if(array_key_exists('REMOTE_ADDR', $_SERVER))
header($header . ": " . $msg);
}
private function respond(Response $response, $code, $params, $headers=[]) {
$response->setStatusCode($code);
foreach($headers as $k=>$v) {
$response->headers->set($k, $v);
}
$response->headers->set('Content-Type', 'application/json');
$opts = JSON_UNESCAPED_SLASHES;
if($this->_pretty) $opts += JSON_PRETTY_PRINT;
$response->setContent(json_encode($params, $opts)."\n");
return $response;
}
private static function toHtmlEntities($input) {
return mb_convert_encoding($input, 'HTML-ENTITIES', mb_detect_encoding($input));
}
public function parse(Request $request, Response $response) {
$opts = [];
if($request->get('timeout')) {
// We might make 2 HTTP requests, so each request gets half the desired timeout
$opts['timeout'] = $request->get('timeout') / 2;
}
if($request->get('max_redirects') !== null) {
$opts['max_redirects'] = (int)$request->get('max_redirects');
}
if($request->get('pretty')) {
$this->_pretty = true;
}
$url = $request->get('url');
$html = $request->get('html');
if(!$url && !$html) {
return $this->respond($response, 400, [
'error' => 'missing_url',
'error_description' => 'Provide a URL or HTML to fetch'
]);
}
if($html) {
// If HTML is provided in the request, parse that, and use the URL provided as the base URL for mf2 resolving
$result['body'] = $html;
$result['url'] = $url;
$result['code'] = null;
} else {
$fetcher = new p3k\XRay\Fetcher($this->http);
$fields = [
'twitter_api_key','twitter_api_secret','twitter_access_token','twitter_access_token_secret',
'github_access_token',
'token'
];
foreach($fields as $f) {
if($v=$request->get($f))
$opts[$f] = $v;
}
$result = $fetcher->fetch($url, $opts);
if(!empty($result['error'])) {
$error_code = isset($result['error_code']) ? $result['error_code'] : 200;
unset($result['error_code']);
return $this->respond($response, $error_code, $result);
}
}
// Check for known services
$host = parse_url($result['url'], PHP_URL_HOST);
if(in_array($host, ['www.instagram.com','instagram.com'])) {
list($data, $parsed) = Formats\Instagram::parse($result['body'], $result['url'], $this->http);
if($request->get('include_original'))
$data['original'] = $parsed;
$data['url'] = $result['url'];
$data['code'] = $result['code'];
return $this->respond($response, 200, $data);
}
if($host == 'xkcd.com' && parse_url($url, PHP_URL_PATH) != '/') {
$data = Formats\XKCD::parse($result['body'], $url);
$data['url'] = $result['url'];
$data['code'] = $result['code'];
return $this->respond($response, 200, $data);
}
// attempt to parse the page as HTML
$doc = new DOMDocument();
@$doc->loadHTML(self::toHtmlEntities($result['body']));
if(!$doc) {
return $this->respond($response, 200, [
'error' => 'invalid_content',
'error_description' => 'The document could not be parsed as HTML'
]);
}
$xpath = new DOMXPath($doc);
// Check for meta http equiv and replace the status code if present
foreach($xpath->query('//meta[translate(@http-equiv,\'STATUS\',\'status\')=\'status\']') as $el) {
$equivStatus = ''.$el->getAttribute('content');
if($equivStatus && is_string($equivStatus)) {
if(preg_match('/^(\d+)/', $equivStatus, $match)) {
$result['code'] = (int)$match[1];
}
}
}
// If a target parameter was provided, make sure a link to it exists on the page
if($target=$request->get('target')) {
$found = [];
if($target) {
self::xPathFindNodeWithAttribute($xpath, 'a', 'href', function($u) use($target, &$found){
if($u == $target) {
$found[$u] = null;
}
});
self::xPathFindNodeWithAttribute($xpath, 'img', 'src', function($u) use($target, &$found){
if($u == $target) {
$found[$u] = null;
}
});
self::xPathFindNodeWithAttribute($xpath, 'video', 'src', function($u) use($target, &$found){
if($u == $target) {
$found[$u] = null;
}
});
self::xPathFindNodeWithAttribute($xpath, 'audio', 'src', function($u) use($target, &$found){
if($u == $target) {
$found[$u] = null;
}
});
}
if(!$found) {
return $this->respond($response, 200, [
'error' => 'no_link_found',
'error_description' => 'The source document does not have a link to the target URL',
'url' => $result['url'],
'code' => $result['code'],
]);
}
}
// If the URL has a fragment ID, find the DOM starting at that node and parse it instead
$html = $result['body'];
$fragment = parse_url($url, PHP_URL_FRAGMENT);
if($fragment) {
$fragElement = self::xPathGetElementById($xpath, $fragment);
if($fragElement) {
$html = $doc->saveHTML($fragElement);
$foundFragment = true;
} else {
$foundFragment = false;
}
}
// Now start pulling in the data from the page. Start by looking for microformats2
$mf2 = mf2\Parse($html, $result['url']);
if($mf2 && count($mf2['items']) > 0) {
$data = Formats\Mf2::parse($mf2, $result['url'], $this->http);
if($data) {
if($fragment) {
$data['info'] = [
'found_fragment' => $foundFragment
];
}
if($request->get('include_original'))
$data['original'] = $html;
$data['url'] = $result['url']; // this will be the effective URL after following redirects
$data['code'] = $result['code'];
return $this->respond($response, 200, $data);
}
}
// TODO: look for other content like OEmbed or other known services later
return $this->respond($response, 200, [
'data' => [
'type' => 'unknown',
],
'url' => $result['url'],
'code' => $result['code']
]);
}
private static function xPathFindNodeWithAttribute($xpath, $node, $attr, $callback) {
foreach($xpath->query('//'.$node.'[@'.$attr.']') as $el) {
$v = $el->getAttribute($attr);
$callback($v);
}
}
private static function xPathGetElementById($xpath, $id) {
$element = null;
foreach($xpath->query("//*[@id='$id']") as $el) {
$element = $el;
}
return $element;
}
private function parseTwitterURL(&$request, &$response, $url, $match) {
$fields = ['twitter_api_key','twitter_api_secret','twitter_access_token','twitter_access_token_secret'];
$creds = [];
foreach($fields as $f) {
if($v=$request->get($f))
$creds[$f] = $v;
}
$data = false;
if(count($creds) == 4) {
list($data, $parsed) = Formats\Twitter::parse($url, $match[1], $creds);
} elseif(count($creds) > 0) {
// If only some Twitter credentials were present, return an error
return $this->respond($response, 400, [
'error' => 'missing_parameters',
'error_description' => 'All 4 Twitter credentials must be included in the request'
]);
} else {
// Accept Tweet JSON and parse that if provided
$json = $request->get('json');
if($json) {
list($data, $parsed) = Formats\Twitter::parse($url, $match[1], null, $json);
}
// Skip parsing from the Twitter API if they didn't include credentials
}
if($data) {
if($request->get('include_original'))
$data['original'] = $parsed;
$data['url'] = $url;
$data['code'] = 200;
return $this->respond($response, 200, $data);
} else {
return $this->respond($response, 200, [
'data' => [
'type' => 'unknown'
],
'url' => $url,
'code' => 0
]);
}
}
private function parseGitHubURL(&$request, &$response, $url) {
$fields = ['github_access_token'];
$creds = [];
foreach($fields as $f) {
if($v=$request->get($f))
$creds[$f] = $v;
}
$data = false;
$json = $request->get('json');
if($json) {
// Accept GitHub JSON and parse that if provided
list($data, $json, $code) = Formats\GitHub::parse($this->http, $url, null, $json);
} else {
// Otherwise fetch the post unauthenticated or with the provided access token
list($data, $json, $code) = Formats\GitHub::parse($this->http, $url, $creds);
}
if($data) {
if($request->get('include_original'))
$data['original'] = $json;
$data['url'] = $url;
$data['code'] = $code;
return $this->respond($response, 200, $data);
} else {
return $this->respond($response, 200, [
'data' => [
'type' => 'unknown'
],
'url' => $url,
'code' => $code
]);
}
}
}