Add support for clients requiring basic HTTP authentication

Client.php

@@ -25,6 +25,7 @@ class Client extends ElasticaClient
                 'host'      => $connection->getHost(),
                 'port'      => $connection->getPort(),
                 'transport' => $connection->getTransport(),
+                'headers'   => $connection->getConfig('headers'),
             );
 
             $this->_logger->logQuery($path, $method, $data, $time, $connection_array, $query);

DependencyInjection/Configuration.php

@@ -78,7 +78,8 @@ class Configuration implements ConfigurationInterface
                                         array(
                                             'host'   => $v['host'],
                                             'port'   => $v['port'],
-                                            'logger' => isset($v['logger']) ? $v['logger'] : null
+                                            'logger' => isset($v['logger']) ? $v['logger'] : null,
+                                            'headers' => isset($v['headers']) ? $v['headers'] : null,
                                         )
                                     )
                                 );
@@ -114,6 +115,11 @@ class Configuration implements ConfigurationInterface
                                             ->treatNullLike('fos_elastica.logger')
                                             ->treatTrueLike('fos_elastica.logger')
                                         ->end()
+                                        ->arrayNode('headers')
+                                            ->children()
+                                                ->scalarNode('Authorization')->end()
+                                            ->end()
+                                        ->end()
                                         ->scalarNode('timeout')->end()
                                     ->end()
                                 ->end()

Logger/ElasticaLogger.php

@@ -38,7 +38,7 @@ class ElasticaLogger implements LoggerInterface
      * @param string $method Rest method to use (GET, POST, DELETE, PUT)
      * @param array  $data   arguments
      * @param float  $time   execution time
-     * @param array  $connection   host, port and transport of the query
+     * @param array  $connection   host, port, transport and headers of the query
      * @param array  $query  arguments
      */
     public function logQuery($path, $method, $data, $time, $connection = array(), $query = array())

README.md

@@ -58,6 +58,23 @@ Most of the time, you will need only one.
         clients:
             default: { host: localhost, port: 9200 }
 
+If your client requires Basic HTTP Authentication, you can specify an Authorization Header to
+include in HTTP requests. The Authorization Header value is a ``base64`` encoded string that
+includes the authentication username and password, and can be obtained by running the following
+command in your terminal:
+
+    php -r "Print 'Basic ' . base64_encode('your_auth_username' . ':' . 'your_auth_password');"
+
+A sample configuration with Basic HTTP Authentication is:
+
+    #app/config/config.yml
+    fos_elastica:
+        clients:
+            default:
+                host: example.com
+                port: 80
+                headers:
+                    Authorization: "Basic jdumrGK7rY9TMuQOPng7GZycmxyMHNoir=="
 
 #### Declare a serializer