feat add getMimetype method

Author: sabakugaara

src/Upyun/Upyun.php

@@ -171,18 +171,28 @@ public function has($path)
      * 获取云存储文件/目录的基本信息
      *
      * @param string $path 云存储的文件路径
+     * @param array $otherHeaders 设置了后，方法将返回其他 http header 中的信息，默认为空
      *
      * @return array 返回一个数组，包含以下 key
      * - `x-upyun-file-type` 当 $path 是目录时，值为 *folder*，当 $path 是文件时，值为 *file*，
      * - `x-upyun-file-size` 文件大小
      * - `x-upyun-file-date` 文件的创建时间
      */
-    public function info($path)
+    public function info($path, $otherHeaders = array())
     {
         $req = new Rest($this->config);
         $response = $req->request('HEAD', $path)
                         ->send();
-        return Util::getHeaderParams($response->getHeaders());
+        return Util::getHeaderParams($response->getHeaders(), $otherHeaders);
+    }
+
+    public function getMimetype($path)
+    {
+        $params = $this->info($path, array('content-type'));
+        if (isset($params['content-type'])) {
+            return explode(';', $params['content-type'])[0];
+        }
+        return '';
     }
 
     /**

src/Upyun/Util.php

@@ -12,13 +12,16 @@ public static function trim($str)
         }
     }
 
-    public static function getHeaderParams($headers)
+    public static function getHeaderParams($headers, $otherParams = array())
     {
         $params = [];
+        $otherParams = array_map('strtolower', $otherParams);
         foreach ($headers as $header => $value) {
             $header = strtolower($header);
             if (strpos($header, 'x-upyun-') !== false) {
                 $params[$header] = $value[0];
+            } else if (in_array($header, $otherParams)) {
+                $params[$header] = $value[0];
             }
         }
         return $params;

tests/UpyunTest.php

@@ -152,6 +152,15 @@ public function testInfo()
         $this->assertEquals($info['x-upyun-file-size'], 19);
     }
 
+    /**
+     * @depends testInfo
+     */
+    public function testGetMimetype()
+    {
+        $type = self::$upyun->getMimetype('test-info.txt');
+        $this->assertEquals($type, 'text/plain');
+    }
+
     /**
      */
     public function testCreateDir()