在 Flutter 中访问 Firebase 存储

Question

我对 Flutter 还很陌生，以前从未使用过 Firebase，所以如果有明显的解决方案，我深表歉意。

我正在开发一个 Flutter 应用程序，它涉及记录表单提交并将它们提交到一个中心位置。

Firebase Storage 似乎很合适，因为据我了解，该应用程序可以将文件上传到云存储桶，然后可以通过 Firebase 控制台访问它们。如果我错了纠正我。

所以我为 Flutter 找到了这个模块；
https://pub.dartlang.org/packages/firebase_storage

我使用示例代码作为基础。

一次在我调用的代码的开头；

final FirebaseApp app = await FirebaseApp.configure(
  name: 'test',
  options: new FirebaseOptions(
    googleAppID: Platform.isIOS
        ? '{ios app id}'
        : '{android app ID}',
    gcmSenderID: '{project number code}',
    apiKey: '{web api key from the firebase console}',
    projectID: '{project ID}',
  ),
);
storage = new FirebaseStorage(
    app: app, storageBucket: '{address to data bucket}');

然后上传我试过的文件；

final StorageReference ref =
storage.ref().child('uploads').child(filename);
final StorageUploadTask uploadTask = ref.putFile(
  file,
  new StorageMetadata(
    contentLanguage: 'en',
    customMetadata: <String, String>{'activity': 'submission'},
  ),
);


final Uri downloadUrl = (await uploadTask.future).downloadUrl;

final http.Response downloadData = await http.get(downloadUrl);
final String name = await ref.getName();
final String bucket = await ref.getBucket();
final String path = await ref.getPath();


return downloadData.statusCode >= 200 && 299 >= downloadData.statusCode;

在 Firebase 控制台中，我创建了 Uploads 文件夹，我认为正确设置了其他所有内容。

我的 Firebase 存储访问规则如下所示；

service firebase.storage {
  match /b/{bucket}/o {
    match /{allPaths=**} {
      allow read, write: if request.auth != null;
    }
  }
}

我的问题是，当我尝试上传文件时，出现以下错误；

W/DynamiteModule(25832): Local module descriptor class for com.google.android.gms.firebasestorage not found.
I/DynamiteModule(25832): Considering local module com.google.android.gms.firebasestorage:0 and remote module com.google.android.gms.firebasestorage:6
I/DynamiteModule(25832): Selected remote version of com.google.android.gms.firebasestorage, version >= 6
W/System  (25832): ClassLoader referenced unknown path: /data/data/com.google.android.gms/app_chimera/m/00000040/n/armeabi-v7a
W/System  (25832): ClassLoader referenced unknown path: /data/data/com.google.android.gms/app_chimera/m/00000040/n/armeabi
E/StorageUtil(25832): error getting token java.util.concurrent.ExecutionException: com.google.firebase.internal.api.FirebaseNoSignedInUserException: Please sign in before trying to get a token.
W/NetworkRequest(25832): no auth token for request
E/StorageException(25832): StorageException has occurred.
E/StorageException(25832): User does not have permission to access this object.
E/StorageException(25832):  Code: -13021 HttpResult: 403
E/StorageException(25832): The server has terminated the upload session
E/StorageException(25832): java.io.IOException: The server has terminated the upload session
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.zzs(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.zzr(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.run(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.StorageTask.zzl(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.zzq.run(Unknown Source)
E/StorageException(25832):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
E/StorageException(25832):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
E/StorageException(25832):  at java.lang.Thread.run(Thread.java:818)
E/StorageException(25832): Caused by: java.io.IOException: {  "error": {    "code": 403,    "message": "Permission denied. Could not perform this operation"  }}
E/StorageException(25832):  at bha.a(:com.google.android.gms.dynamite_dynamitemodulesc@12685022@12.6.85 (040308-197041431):147)
E/StorageException(25832):  at bha.a(:com.google.android.gms.dynamite_dynamitemodulesc@12685022@12.6.85 (040308-197041431):119)
E/StorageException(25832):  at bgu.onTransact(:com.google.android.gms.dynamite_dynamitemodulesc@12685022@12.6.85 (040308-197041431):7)
E/StorageException(25832):  at android.os.Binder.transact(Binder.java:387)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zza.transactAndReadExceptionReturnVoid(Unknown Source)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zzm.zzf(Unknown Source)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zzq.zza(Unknown Source)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zzf.zza(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.zzc(Unknown Source)
E/StorageException(25832):  ... 6 more
E/StorageException(25832): StorageException has occurred.
E/StorageException(25832): User does not have permission to access this object.
E/StorageException(25832):  Code: -13021 HttpResult: 403
E/StorageException(25832): The server has terminated the upload session
E/StorageException(25832): java.io.IOException: The server has terminated the upload session
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.zzs(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.zzr(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.run(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.StorageTask.zzl(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.zzq.run(Unknown Source)
E/StorageException(25832):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
E/StorageException(25832):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
E/StorageException(25832):  at java.lang.Thread.run(Thread.java:818)
E/StorageException(25832): Caused by: java.io.IOException: {  "error": {    "code": 403,    "message": "Permission denied. Could not perform this operation"  }}
E/StorageException(25832):  at bha.a(:com.google.android.gms.dynamite_dynamitemodulesc@12685022@12.6.85 (040308-197041431):147)
E/StorageException(25832):  at bha.a(:com.google.android.gms.dynamite_dynamitemodulesc@12685022@12.6.85 (040308-197041431):119)
E/StorageException(25832):  at bgu.onTransact(:com.google.android.gms.dynamite_dynamitemodulesc@12685022@12.6.85 (040308-197041431):7)
E/StorageException(25832):  at android.os.Binder.transact(Binder.java:387)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zza.transactAndReadExceptionReturnVoid(Unknown Source)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zzm.zzf(Unknown Source)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zzq.zza(Unknown Source)
E/StorageException(25832):  at com.google.android.gms.internal.firebase_storage.zzf.zza(Unknown Source)
E/StorageException(25832):  at com.google.firebase.storage.UploadTask.zzc(Unknown Source)
E/StorageException(25832):  ... 6 more

是否可以使用应用程序帐户（服务帐户？）登录，以便个人用户不需要登录？

我在这里做错了什么？

Answer 1

引用你的StorageException：

用户无权访问此对象。

这是您所期望的，因为您的规则规定如下：

allow read, write: if request.auth != null;

Firebase使用身份验证。

有两种选择可以解决这个问题：

• 要么你验证与用户火力地堡使用firebase_auth插件

• 或者您可以通过将规则更改为 allow read, write;

该存储规则文件包含有关整合信息火力地堡认证。