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- <?php
- /**
- * GET an HTTP URL to retrieve its content
- *
- * @param string $url URL to get (http://...)
- * @param int $timeout network timeout (in seconds)
- * @param int $maxBytes maximum downloaded bytes (default: 4 MiB)
- *
- * @return array HTTP response headers, downloaded content
- *
- * Output format:
- * [0] = associative array containing HTTP response headers
- * [1] = URL content (downloaded data)
- *
- * Example:
- * list($headers, $data) = get_http_response('http://sebauvage.net/');
- * if (strpos($headers[0], '200 OK') !== false) {
- * echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
- * } else {
- * echo 'There was an error: '.htmlspecialchars($headers[0]);
- * }
- *
- * @see http://php.net/manual/en/function.file-get-contents.php
- * @see http://php.net/manual/en/function.stream-context-create.php
- * @see http://php.net/manual/en/function.get-headers.php
- */
- function get_http_response($url, $timeout = 30, $maxBytes = 4194304)
- {
- $urlObj = new Url($url);
- if (! filter_var($url, FILTER_VALIDATE_URL) || ! $urlObj->isHttp()) {
- return array(array(0 => 'Invalid HTTP Url'), false);
- }
- $options = array(
- 'http' => array(
- 'method' => 'GET',
- 'timeout' => $timeout,
- 'user_agent' => 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:23.0)'
- .' Gecko/20100101 Firefox/23.0',
- 'request_fulluri' => true,
- )
- );
- $context = stream_context_create($options);
- stream_context_set_default($options);
- list($headers, $finalUrl) = get_redirected_headers($urlObj->cleanup());
- if (! $headers || strpos($headers[0], '200 OK') === false) {
- return array($headers, false);
- }
- try {
- // TODO: catch Exception in calling code (thumbnailer)
- $content = file_get_contents($finalUrl, false, $context, -1, $maxBytes);
- } catch (Exception $exc) {
- return array(array(0 => 'HTTP Error'), $exc->getMessage());
- }
- return array($headers, $content);
- }
- /**
- * Retrieve HTTP headers, following n redirections (temporary and permanent).
- *
- * @param string $url initial URL to reach.
- * @param int $redirectionLimit max redirection follow..
- *
- * @return array
- */
- function get_redirected_headers($url, $redirectionLimit = 3)
- {
- $headers = get_headers($url, 1);
- // Headers found, redirection found, and limit not reached.
- if ($redirectionLimit-- > 0
- && !empty($headers)
- && (strpos($headers[0], '301') !== false || strpos($headers[0], '302') !== false)
- && !empty($headers['Location'])) {
- $redirection = is_array($headers['Location']) ? end($headers['Location']) : $headers['Location'];
- if ($redirection != $url) {
- return get_redirected_headers($redirection, $redirectionLimit);
- }
- }
- return array($headers, $url);
- }
- /**
- * Returns the server's base URL: scheme://domain.tld[:port]
- *
- * @param array $server the $_SERVER array
- *
- * @return string the server's base URL
- *
- * @see http://www.ietf.org/rfc/rfc7239.txt
- * @see http://www.ietf.org/rfc/rfc6648.txt
- * @see http://stackoverflow.com/a/3561399
- * @see http://stackoverflow.com/q/452375
- */
- function server_url($server)
- {
- $scheme = 'http';
- $port = '';
- // Shaarli is served behind a proxy
- if (isset($server['HTTP_X_FORWARDED_PROTO'])) {
- // Keep forwarded scheme
- $scheme = $server['HTTP_X_FORWARDED_PROTO'];
- if (isset($server['HTTP_X_FORWARDED_PORT'])) {
- // Keep forwarded port
- $port = ':'.$server['HTTP_X_FORWARDED_PORT'];
- }
- return $scheme.'://'.$server['SERVER_NAME'].$port;
- }
- // SSL detection
- if ((! empty($server['HTTPS']) && strtolower($server['HTTPS']) == 'on')
- || (isset($server['SERVER_PORT']) && $server['SERVER_PORT'] == '443')) {
- $scheme = 'https';
- }
- // Do not append standard port values
- if (($scheme == 'http' && $server['SERVER_PORT'] != '80')
- || ($scheme == 'https' && $server['SERVER_PORT'] != '443')) {
- $port = ':'.$server['SERVER_PORT'];
- }
- return $scheme.'://'.$server['SERVER_NAME'].$port;
- }
- /**
- * Returns the absolute URL of the current script, without the query
- *
- * If the resource is "index.php", then it is removed (for better-looking URLs)
- *
- * @param array $server the $_SERVER array
- *
- * @return string the absolute URL of the current script, without the query
- */
- function index_url($server)
- {
- $scriptname = $server['SCRIPT_NAME'];
- if (endswith($scriptname, 'index.php')) {
- $scriptname = substr($scriptname, 0, -9);
- }
- return server_url($server) . $scriptname;
- }
- /**
- * Returns the absolute URL of the current script, with the query
- *
- * If the resource is "index.php", then it is removed (for better-looking URLs)
- *
- * @param array $server the $_SERVER array
- *
- * @return string the absolute URL of the current script, with the query
- */
- function page_url($server)
- {
- if (! empty($server['QUERY_STRING'])) {
- return index_url($server).'?'.$server['QUERY_STRING'];
- }
- return index_url($server);
- }
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