下载前如何检查Firebase中的文件类型? [英] How to check the type of file in Firebase before downloading?

问题描述

我需要从Firebase Storage下载一组图像.

I need to download a set of images from Firebase Storage.

在下载之前，我需要检查图像的类型(即，如果仅.jpeg，则仅需要下载).

Before downloading, I need to check the type of Images (i.e. if .jpeg only, only then will I need to download).

有人可以在Python中帮助我吗?

Can anyone help me with a code in Python?

推荐答案

最简单的方法实际上是编写存储安全规则，除非文件的内容类型为image/*，否则该规则将禁止下载:

The easiest way of doing this is actually writing a Storage Security Rule that disallows downloads unless the file has a content type of image/*:

service firebase.storage {
 match /b/<your-firebase-storage-bucket>/o {
   match /images/{imageId} {
       allow read: if resource.contentType.matches('image/.*');
     }
   }
 }
}

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