Firebase存储,基于用户的上传/删除的正确规则是什么？

Question

我想为Firebase/Storage创建基于用户的安全性.如果我只上传图像,下面允许写入很好.但它可以防止删除照片.如何为此案例创建适当的安全规则？

service firebase.storage {
  match /b/<bucket>/o {
    match /{allPaths=**} {
      allow read: if request.auth != null;
    }
    match /users/{uid}/{filename} {
      allow write: if isCurrentUser(uid);
      allow write: if isImage() &&
                      isCurrentUser(uid) &&
                      lessThanNMegabytes(n) &&
                      request.resource !=null &&
                      filename.size() < 50;
    }
  }
}

function isCurrentUser(uid) {
    return request.auth.uid == uid;
}

function lessThanNMegabytes(n) {
    return request.resource.size < n * 1024 * 1024;
}

function isImage() {
    return request.resource.contentType.matches("image/.*");
}

Answer 1

我会用它来检查你是创建/更新文件还是删除它

match /users/{uid}/{filename} {
    allow write: if isCurrentUser(uid);
    allow write: if resource == null ||
         ( isImage() &&
         lessThanNMegabytes(n) &&
         request.resource !=null &&
         filename.size() < 50 );
}