improve image type check

controller/ApiController.php

@@ -610,14 +610,19 @@ Class ApiController extends Controller {
             return '';
         }
 
-        return strtolower(array_pop($arr));
+        $suffix = array_pop($arr);
+        if (in_array($suffix, ['jpg', 'jpeg'])) {
+            $suffix = 'jpg';
+        }
+
+        return strtolower($suffix);
     }
 
     //从文件类型中解析文件后缀
     protected function getSuffixFromFileType($fileType) {
         $arr = explode('/', $fileType);
         if (count($arr) < 2) {
-            return '';
+            return $fileType;
         }
 
         $suffix = array_pop($arr);