X-Git-Url: https://git.immae.eu/?a=blobdiff_plain;f=application%2FHttpUtils.php;h=e2c1cb470f8a9c776358046839b10d3cdbdd3fd5;hb=854ea372553d6ef8174cae320801e5ff3a101a87;hp=175333aef4ae66a1f7cbd209eb8442a3c4fc8e3e;hpb=451314eb48c7d922264adc6eada8a0273b12344c;p=github%2Fshaarli%2FShaarli.git

diff --git a/application/HttpUtils.php b/application/HttpUtils.php
index 175333ae..e2c1cb47 100644
--- a/application/HttpUtils.php
+++ b/application/HttpUtils.php
@@ -13,7 +13,7 @@
  *  [1] = URL content (downloaded data)
  *
  * Example:
- *  list($headers, $data) = get_http_url('http://sebauvage.net/');
+ *  list($headers, $data) = get_http_response('http://sebauvage.net/');
  *  if (strpos($headers[0], '200 OK') !== false) {
  *      echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
  *  } else {
@@ -24,29 +24,144 @@
  * @see http://php.net/manual/en/function.stream-context-create.php
  * @see http://php.net/manual/en/function.get-headers.php
  */
-function get_http_url($url, $timeout = 30, $maxBytes = 4194304)
+function get_http_response($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'
+                         .' 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)
-        $content = file_get_contents($url, false, $context, -1, $maxBytes);
+        $content = file_get_contents($finalUrl, false, $context, -1, $maxBytes);
     } catch (Exception $exc) {
         return array(array(0 => 'HTTP Error'), $exc->getMessage());
     }
 
-    if (!$content) {
-        return array(array(0 => 'HTTP Error'), '');
+    return array($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;
+}
 
-    return array(get_headers($url, 1), $content);
+/**
+ * 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);
 }