Google 云语音 API iOS returns 401 未通过 Firebase 存储文件进行身份验证

Question

我正在尝试使用我的 iOS 应用程序中的 Google Cloud Speech Api 转录长文件（>1 分钟）。
为此，我执行以下操作：

1) 如文档中所写，我匿名向 firebase 验证用户

[[FIRAuth auth]
 signInAnonymouslyWithCompletion:^(FIRUser *_Nullable user, NSError *_Nullable error) {
     // ...
     if (!error){
         self.user = user;

         [self.user getTokenWithCompletion:^(NSString * _Nullable token, NSError * _Nullable error) {
             if (!error) {
                 self.token = token;
                 [self uploadFile];
             }
         }];

     }
 }];

2) 然后我将我的文件上传到 Firebase 存储并获取 URI

- (void)uploadFile
{

    FIRStorage * storage = [FIRStorage storage];
    FIRStorageReference *storageRef = [storage reference];
    FIRStorageReference *sonetRef = [storageRef child:@"transcribeTest/sonet130.mp3"];

    NSData *sonet = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"sonet130" ofType:@"mp3"]];

    FIRStorageUploadTask *uploadTask  = [sonetRef putData:sonet metadata:nil completion:^(FIRStorageMetadata * _Nullable metadata, NSError * _Nullable error) {

        if (error != nil) {
            // Uh-oh, an error occurred!
        } else {
            // Metadata contains file metadata such as size, content-type, and download URL.
            NSURL *downloadURL = metadata.downloadURL;

            NSString *path = [NSString stringWithFormat:@"gs://%@/%@",metadata.bucket,metadata.path];

            NSURL * gsURL = [NSURL URLWithString:path];//@"gs://%@",downloadURL.path]];

            [self trnscribeFileAtURL:gsURL];
        }

    }];
    [uploadTask resume];
}

3) 下一步应该是向 Google Cloud Speech API 发送 Asyncrecognize 请求。但是我收到 401 错误 ''。

-(void)trnscribeFileAtURL:(NSURL*)url
{
    NSString *service = @"https:/speech.googleapis.com/v1beta1/speech:asyncrecognize";
    service = [service stringByAppendingString:@"?key="];
    service = [service stringByAppendingString:API_KEY];

    NSData *audioData = [NSData dataWithContentsOfFile:[self soundFilePath]];
    NSDictionary *configRequest = @{@"encoding":@"LINEAR16",
                                    @"sampleRate":@(SAMPLE_RATE),
                                    @"languageCode":@"en-UK",
                                    @"maxAlternatives":@30};
    NSDictionary *audioRequest = @{@"uri":url.absoluteString};
    NSDictionary *requestDictionary = @{@"config":configRequest,
                                        @"audio":audioRequest};
    NSError *error;
    NSData *requestData = [NSJSONSerialization dataWithJSONObject:requestDictionary
                                                          options:0
                                                            error:&error];

    NSString *path = service;
    NSURL *URL = [NSURL URLWithString:path];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
    // if your API key has a bundle ID restriction, specify the bundle ID like this:
    [request addValue:[[NSBundle mainBundle] bundleIdentifier] forHTTPHeaderField:@"X-Ios-Bundle-Identifier"];
    NSString *contentType = @"application/json";
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];
    [request addValue:[NSString stringWithFormat:@"Bearer %@",self.token] forHTTPHeaderField:@"Authorization"];
    [request setHTTPBody:requestData];
    [request setHTTPMethod:@"POST"];

    NSURLSessionTask *task =
    [[NSURLSession sharedSession]
     dataTaskWithRequest:request
     completionHandler:
     ^(NSData *data, NSURLResponse *response, NSError *error) {
         dispatch_async(dispatch_get_main_queue(),
                        ^{
                            NSString *stringResult = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                            _textView.text = stringResult;
                            NSLog(@"RESULT: %@", stringResult);
                        });
     }];
    [task resume];

}

响应JSON：

2017-02-28 19:58:05.837337 Speech[8057:2054726] RESULT: {
  "error": {
    "code": 401,
    "message": "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.",
    "status": "UNAUTHENTICATED"
  }
}

看起来问题出在这行代码上：

[request addValue:[NSString stringWithFormat:@"Bearer %@",self.token] forHTTPHeaderField:@"Authorization"];

我正在尝试传递从 Firebase 匿名身份验证获得的令牌，但它不适合。我搜索了我无法找到如何为匿名用户获取正确凭据的方法。请帮忙。

Answer 1

简短的回答是您不能使用 Firebase Auth 令牌直接从客户端访问 Google API，例如 Speech 或 Vision。正如错误消息所说，这些 API 需要以下之一：

Google OAuth 2.0（用户启动或通过服务帐户启动）
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在 the Speech docs on authentication 中查看更多信息。

执行此操作的最简单方法可能是使用类似 Cloud Functions 的方法并监听文件上传，然后处理音频，然后将其写回数据库。

Answer 2

什么API_KEY？

你没有提到它！

Google 云语音 API iOS returns 401 未通过 Firebase 存储文件进行身份验证

Google Cloud Speech API iOS returns 401 UNAUTHENTICATED with Firebase Storage File

ios

firebase-storage

google-cloud-speech