1557cefbd7
* `get_http_url()` renamed to `get_http_response()`. * Use the same HTTP context to retrieve response headers and content. * Follow HTTP 301 and 302 redirections to retrieve the title (default max 3 redirections). * Add `LinkUtils` to extract titles and charset. * Try to retrieve charset from HTTP headers first (new), then HTML content. * Use mb_string to re-encode title if necessary.
167 lines
5 KiB
PHP
Executable file
167 lines
5 KiB
PHP
Executable file
<?php
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/**
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* GET an HTTP URL to retrieve its content
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*
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* @param string $url URL to get (http://...)
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* @param int $timeout network timeout (in seconds)
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* @param int $maxBytes maximum downloaded bytes (default: 4 MiB)
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*
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* @return array HTTP response headers, downloaded content
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*
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* Output format:
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* [0] = associative array containing HTTP response headers
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* [1] = URL content (downloaded data)
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*
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* Example:
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* list($headers, $data) = get_http_response('http://sebauvage.net/');
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* if (strpos($headers[0], '200 OK') !== false) {
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* echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
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* } else {
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* echo 'There was an error: '.htmlspecialchars($headers[0]);
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* }
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*
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* @see http://php.net/manual/en/function.file-get-contents.php
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* @see http://php.net/manual/en/function.stream-context-create.php
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* @see http://php.net/manual/en/function.get-headers.php
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*/
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function get_http_response($url, $timeout = 30, $maxBytes = 4194304)
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{
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$urlObj = new Url($url);
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if (! filter_var($url, FILTER_VALIDATE_URL) || ! $urlObj->isHttp()) {
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return array(array(0 => 'Invalid HTTP Url'), false);
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}
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$options = array(
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'http' => array(
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'method' => 'GET',
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'timeout' => $timeout,
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'user_agent' => 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:23.0)'
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.' Gecko/20100101 Firefox/23.0',
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'request_fulluri' => true,
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)
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);
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$context = stream_context_create($options);
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stream_context_set_default($options);
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list($headers, $finalUrl) = get_redirected_headers($urlObj->cleanup());
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if (! $headers || strpos($headers[0], '200 OK') === false) {
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return array($headers, false);
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}
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try {
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// TODO: catch Exception in calling code (thumbnailer)
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$content = file_get_contents($finalUrl, false, $context, -1, $maxBytes);
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} catch (Exception $exc) {
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return array(array(0 => 'HTTP Error'), $exc->getMessage());
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}
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return array($headers, $content);
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}
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/**
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* Retrieve HTTP headers, following n redirections (temporary and permanent).
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*
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* @param string $url initial URL to reach.
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* @param int $redirectionLimit max redirection follow..
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*
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* @return array
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*/
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function get_redirected_headers($url, $redirectionLimit = 3)
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{
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$headers = get_headers($url, 1);
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// Headers found, redirection found, and limit not reached.
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if ($redirectionLimit-- > 0
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&& !empty($headers)
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&& (strpos($headers[0], '301') !== false || strpos($headers[0], '302') !== false)
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&& !empty($headers['Location'])) {
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$redirection = is_array($headers['Location']) ? end($headers['Location']) : $headers['Location'];
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if ($redirection != $url) {
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return get_redirected_headers($redirection, $redirectionLimit);
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}
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}
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return array($headers, $url);
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}
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/**
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* Returns the server's base URL: scheme://domain.tld[:port]
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*
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* @param array $server the $_SERVER array
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*
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* @return string the server's base URL
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*
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* @see http://www.ietf.org/rfc/rfc7239.txt
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* @see http://www.ietf.org/rfc/rfc6648.txt
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* @see http://stackoverflow.com/a/3561399
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* @see http://stackoverflow.com/q/452375
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*/
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function server_url($server)
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{
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$scheme = 'http';
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$port = '';
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// Shaarli is served behind a proxy
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if (isset($server['HTTP_X_FORWARDED_PROTO'])) {
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// Keep forwarded scheme
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$scheme = $server['HTTP_X_FORWARDED_PROTO'];
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if (isset($server['HTTP_X_FORWARDED_PORT'])) {
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// Keep forwarded port
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$port = ':'.$server['HTTP_X_FORWARDED_PORT'];
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}
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return $scheme.'://'.$server['SERVER_NAME'].$port;
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}
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// SSL detection
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if ((! empty($server['HTTPS']) && strtolower($server['HTTPS']) == 'on')
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|| (isset($server['SERVER_PORT']) && $server['SERVER_PORT'] == '443')) {
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$scheme = 'https';
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}
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// Do not append standard port values
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if (($scheme == 'http' && $server['SERVER_PORT'] != '80')
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|| ($scheme == 'https' && $server['SERVER_PORT'] != '443')) {
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$port = ':'.$server['SERVER_PORT'];
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}
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return $scheme.'://'.$server['SERVER_NAME'].$port;
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}
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/**
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* Returns the absolute URL of the current script, without the query
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*
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* If the resource is "index.php", then it is removed (for better-looking URLs)
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*
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* @param array $server the $_SERVER array
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*
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* @return string the absolute URL of the current script, without the query
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*/
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function index_url($server)
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{
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$scriptname = $server['SCRIPT_NAME'];
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if (endswith($scriptname, 'index.php')) {
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$scriptname = substr($scriptname, 0, -9);
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}
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return server_url($server) . $scriptname;
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}
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/**
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* Returns the absolute URL of the current script, with the query
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*
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* If the resource is "index.php", then it is removed (for better-looking URLs)
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*
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* @param array $server the $_SERVER array
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*
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* @return string the absolute URL of the current script, with the query
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*/
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function page_url($server)
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{
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if (! empty($server['QUERY_STRING'])) {
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return index_url($server).'?'.$server['QUERY_STRING'];
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}
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return index_url($server);
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}
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