You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
220 lines
6.6 KiB
220 lines
6.6 KiB
<?php
|
|
use Symfony\Component\HttpFoundation\Request;
|
|
use Symfony\Component\HttpFoundation\Response;
|
|
|
|
use XRay\Formats;
|
|
|
|
class Parse {
|
|
|
|
public $http;
|
|
public $mc;
|
|
private $_cacheTime = 120;
|
|
private $_pretty = false;
|
|
|
|
public function __construct() {
|
|
$this->http = new p3k\HTTP();
|
|
if(Config::$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 $response) {
|
|
|
|
if($request->get('timeout')) {
|
|
// We might make 2 HTTP requests, so each request gets half the desired timeout
|
|
$this->http->timeout = $request->get('timeout') / 2;
|
|
}
|
|
|
|
if($request->get('max_redirects')) {
|
|
$this->http->max_redirects = (int)$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;
|
|
} else {
|
|
// Attempt some basic URL validation
|
|
$scheme = parse_url($url, PHP_URL_SCHEME);
|
|
if(!in_array($scheme, ['http','https'])) {
|
|
return $this->respond($response, 400, [
|
|
'error' => 'invalid_url',
|
|
'error_description' => 'Only http and https URLs are supported'
|
|
]);
|
|
}
|
|
|
|
$host = parse_url($url, PHP_URL_HOST);
|
|
if(!$host) {
|
|
return $this->respond($response, 400, [
|
|
'error' => 'invalid_url',
|
|
'error_description' => 'The URL provided was not valid'
|
|
]);
|
|
}
|
|
|
|
$url = \normalize_url($url);
|
|
|
|
// Now fetch the URL and check for any curl errors
|
|
// Don't cache the response if a token is used to fetch it
|
|
if($this->mc && !$request->get('token')) {
|
|
$cacheKey = 'xray-'.md5($url);
|
|
if($cached=$this->mc->get($cacheKey)) {
|
|
$result = json_decode($cached, true);
|
|
self::debug('using HTML from cache', 'X-Cache-Debug');
|
|
} else {
|
|
$result = $this->http->get($url);
|
|
$cacheData = json_encode($result);
|
|
// App Engine limits the size of cached items, so don't cache ones larger than that
|
|
if(strlen($cacheData) < 1000000)
|
|
$this->mc->set($cacheKey, $cacheData, MEMCACHE_COMPRESSED, $this->_cacheTime);
|
|
}
|
|
} else {
|
|
$headers = [];
|
|
if($request->get('token')) {
|
|
$headers[] = 'Authorization: Bearer ' . $request->get('token');
|
|
}
|
|
|
|
$result = $this->http->get($url, $headers);
|
|
}
|
|
|
|
if($result['error']) {
|
|
return $this->respond($response, 200, [
|
|
'error' => $result['error'],
|
|
'error_description' => $result['error_description']
|
|
]);
|
|
}
|
|
|
|
if(trim($result['body']) == '') {
|
|
return $this->respond($response, 200, [
|
|
'error' => 'no_content',
|
|
'error_description' => 'We did not get a response body when fetching the URL'
|
|
]);
|
|
}
|
|
|
|
// Check for HTTP 401/403
|
|
if($result['code'] == 401) {
|
|
return $this->respond($response, 200, [
|
|
'error' => 'unauthorized',
|
|
'error_description' => 'The URL returned "HTTP 401 Unauthorized"',
|
|
]);
|
|
}
|
|
if($result['code'] == 403) {
|
|
return $this->respond($response, 200, [
|
|
'error' => 'forbidden',
|
|
'error_description' => 'The URL returned "HTTP 403 Forbidden"',
|
|
]);
|
|
}
|
|
|
|
}
|
|
|
|
// 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'
|
|
]);
|
|
}
|
|
|
|
// If a target parameter was provided, make sure a link to it exists on the page
|
|
if($target=$request->get('target')) {
|
|
$xpath = new DOMXPath($doc);
|
|
|
|
$found = [];
|
|
if($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'
|
|
]);
|
|
}
|
|
}
|
|
|
|
// Now start pulling in the data from the page. Start by looking for microformats2
|
|
$mf2 = mf2\Parse($result['body'], $result['url']);
|
|
|
|
if($mf2 && count($mf2['items']) > 0) {
|
|
$data = Formats\Mf2::parse($mf2, $result['url'], $this->http);
|
|
if($data) {
|
|
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',
|
|
]
|
|
]);
|
|
}
|
|
|
|
private static function xPathFindNodeWithAttribute($xpath, $node, $attr, $callback) {
|
|
foreach($xpath->query('//'.$node.'[@'.$attr.']') as $el) {
|
|
$v = $el->getAttribute($attr);
|
|
$callback($v);
|
|
}
|
|
}
|
|
|
|
}
|