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246 lines
7.3 KiB
246 lines
7.3 KiB
<?php
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\Response;
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use XRay\Formats;
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class Parse {
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public $http;
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public $mc;
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private $_cacheTime = 120;
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private $_pretty = false;
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public function __construct() {
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$this->http = new p3k\HTTP();
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if(Config::$cache && class_exists('Memcache')) {
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$this->mc = new Memcache();
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$this->mc->addServer('127.0.0.1');
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}
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}
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public static function debug($msg, $header='X-Parse-Debug') {
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syslog(LOG_INFO, $msg);
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if(array_key_exists('REMOTE_ADDR', $_SERVER))
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header($header . ": " . $msg);
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}
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private function respond(Response $response, $code, $params, $headers=[]) {
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$response->setStatusCode($code);
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foreach($headers as $k=>$v) {
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$response->headers->set($k, $v);
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}
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$response->headers->set('Content-Type', 'application/json');
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$opts = JSON_UNESCAPED_SLASHES;
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if($this->_pretty) $opts += JSON_PRETTY_PRINT;
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$response->setContent(json_encode($params, $opts)."\n");
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return $response;
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}
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private static function toHtmlEntities($input) {
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return mb_convert_encoding($input, 'HTML-ENTITIES', mb_detect_encoding($input));
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}
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public function parse(Request $request, Response $response) {
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if($request->get('timeout')) {
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// We might make 2 HTTP requests, so each request gets half the desired timeout
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$this->http->timeout = $request->get('timeout') / 2;
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}
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if($request->get('max_redirects')) {
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$this->http->max_redirects = (int)$request->get('max_redirects');
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}
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if($request->get('pretty')) {
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$this->_pretty = true;
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}
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$url = $request->get('url');
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$html = $request->get('html');
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if(!$url && !$html) {
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return $this->respond($response, 400, [
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'error' => 'missing_url',
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'error_description' => 'Provide a URL or HTML to fetch'
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]);
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}
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if($html) {
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// If HTML is provided in the request, parse that, and use the URL provided as the base URL for mf2 resolving
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$result['body'] = $html;
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$result['url'] = $url;
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} else {
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// Attempt some basic URL validation
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$scheme = parse_url($url, PHP_URL_SCHEME);
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if(!in_array($scheme, ['http','https'])) {
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return $this->respond($response, 400, [
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'error' => 'invalid_url',
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'error_description' => 'Only http and https URLs are supported'
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]);
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}
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$host = parse_url($url, PHP_URL_HOST);
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if(!$host) {
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return $this->respond($response, 400, [
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'error' => 'invalid_url',
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'error_description' => 'The URL provided was not valid'
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]);
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}
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$url = \normalize_url($url);
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// Now fetch the URL and check for any curl errors
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// Don't cache the response if a token is used to fetch it
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if($this->mc && !$request->get('token')) {
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$cacheKey = 'xray-'.md5($url);
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if($cached=$this->mc->get($cacheKey)) {
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$result = json_decode($cached, true);
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self::debug('using HTML from cache', 'X-Cache-Debug');
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} else {
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$result = $this->http->get($url);
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$cacheData = json_encode($result);
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// App Engine limits the size of cached items, so don't cache ones larger than that
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if(strlen($cacheData) < 1000000)
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$this->mc->set($cacheKey, $cacheData, MEMCACHE_COMPRESSED, $this->_cacheTime);
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}
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} else {
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$headers = [];
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if($request->get('token')) {
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$headers[] = 'Authorization: Bearer ' . $request->get('token');
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}
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$result = $this->http->get($url, $headers);
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}
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if($result['error']) {
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return $this->respond($response, 200, [
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'error' => $result['error'],
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'error_description' => $result['error_description']
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]);
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}
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if(trim($result['body']) == '') {
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return $this->respond($response, 200, [
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'error' => 'no_content',
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'error_description' => 'We did not get a response body when fetching the URL'
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]);
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}
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// Check for HTTP 401/403
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if($result['code'] == 401) {
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return $this->respond($response, 200, [
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'error' => 'unauthorized',
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'error_description' => 'The URL returned "HTTP 401 Unauthorized"',
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]);
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}
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if($result['code'] == 403) {
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return $this->respond($response, 200, [
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'error' => 'forbidden',
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'error_description' => 'The URL returned "HTTP 403 Forbidden"',
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]);
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}
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}
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// attempt to parse the page as HTML
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$doc = new DOMDocument();
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@$doc->loadHTML(self::toHtmlEntities($result['body']));
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if(!$doc) {
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return $this->respond($response, 200, [
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'error' => 'invalid_content',
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'error_description' => 'The document could not be parsed as HTML'
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]);
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}
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$xpath = new DOMXPath($doc);
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// If a target parameter was provided, make sure a link to it exists on the page
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if($target=$request->get('target')) {
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$found = [];
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if($target) {
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self::xPathFindNodeWithAttribute($xpath, 'a', 'href', function($u) use($target, &$found){
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if($u == $target) {
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$found[$u] = null;
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}
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});
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self::xPathFindNodeWithAttribute($xpath, 'img', 'src', function($u) use($target, &$found){
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if($u == $target) {
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$found[$u] = null;
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}
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});
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self::xPathFindNodeWithAttribute($xpath, 'video', 'src', function($u) use($target, &$found){
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if($u == $target) {
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$found[$u] = null;
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}
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});
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self::xPathFindNodeWithAttribute($xpath, 'audio', 'src', function($u) use($target, &$found){
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if($u == $target) {
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$found[$u] = null;
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}
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});
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}
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if(!$found) {
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return $this->respond($response, 200, [
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'error' => 'no_link_found',
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'error_description' => 'The source document does not have a link to the target URL'
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]);
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}
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}
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// If the URL has a fragment ID, find the DOM starting at that node and parse it instead
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$html = $result['body'];
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$fragment = parse_url($url, PHP_URL_FRAGMENT);
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if($fragment) {
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$fragElement = self::xPathGetElementById($xpath, $fragment);
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if($fragElement) {
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$html = $doc->saveHTML($fragElement);
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$foundFragment = true;
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} else {
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$foundFragment = false;
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}
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}
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// Now start pulling in the data from the page. Start by looking for microformats2
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$mf2 = mf2\Parse($html, $result['url']);
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if($mf2 && count($mf2['items']) > 0) {
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$data = Formats\Mf2::parse($mf2, $result['url'], $this->http);
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if($data) {
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if($fragment) {
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$data['info'] = [
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'found_fragment' => $foundFragment
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];
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}
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return $this->respond($response, 200, $data);
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}
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}
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// TODO: look for other content like OEmbed or other known services later
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return $this->respond($response, 200, [
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'data' => [
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'type' => 'unknown',
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]
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]);
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}
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private static function xPathFindNodeWithAttribute($xpath, $node, $attr, $callback) {
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foreach($xpath->query('//'.$node.'[@'.$attr.']') as $el) {
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$v = $el->getAttribute($attr);
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$callback($v);
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}
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}
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private static function xPathGetElementById($xpath, $id) {
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$element = null;
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foreach($xpath->query("//*[@id='$id']") as $el) {
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$element = $el;
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}
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return $element;
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}
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}
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