Google 云平台身份验证问题

Question

我们在 asp-net core 3.1 中的项目 API 身份验证遇到问题。具体来说，我们集成了 Google 提供的文字转语音服务。在本地一切正常，但当网络应用在线时不会发生这种情况。

try
        {

            var path = "C://GoogleVoice//food-safety-trainer-47a9337eda0f.json";

            var credential = GoogleCredential.FromFile(path);
            var storage = StorageClient.Create(credential);

            TextToSpeechClient client = TextToSpeechClient.Create();
            var test = client.GrpcClient;

            // The input can be provided as text or SSML.
            SynthesisInput input = new SynthesisInput
            {
                Text = text
            };

            VoiceSelectionParams voiceSelection = new VoiceSelectionParams();
            voiceSelection.LanguageCode = "it-IT";
            voiceSelection.Name = "it-IT-Wavenet-A";
            voiceSelection.SsmlGender = SsmlVoiceGender.Female;
            
            // The audio configuration determines the output format and speaking rate.
            AudioConfig audioConfig = new AudioConfig
            {
                AudioEncoding = AudioEncoding.Mp3
            };
            SynthesizeSpeechResponse response = client.SynthesizeSpeech(input, voiceSelection, audioConfig);

            var result = _mp3Helper.SaveFile(response);
            if (result.Item1 == "Success")
                return Json(new { Result = true, Value = result.Item2 });
            else
                return Json(new { Result = false, Error = result.ToString() });
        }
        catch(Exception ex)
        {
            return Json(new { Result = false, Error = ex.Message.ToString() });
        }

The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.

Answer 1

假设您要为语音和存储使用相同的服务帐户，您需要为 text-to-speech 客户端指定凭据。选项：

设置GOOGLE_APPLICATION_DEFAULT_CREDENTIALS环境变量来引用JSON文件。理想情况下，将其作为部署配置的一部分而不是在代码中执行，但如果需要，您可以在代码中设置环境变量。届时，您可以删除存储客户端凭据的任何显式 loading/setting。
在TextToSpeechClientBuilder中指定CredentialPath：
```
var client = new TextToSpeechClientBuilder { CredentialPath = path }.Build();
```
这将加载一个单独的凭据。

通过 TextToSpeechClientBuilder 中的 TokenAccessMethod 属性指定凭据的令牌访问方法：

var client = new TextToSpeechClientBuilder
     {
         TokenAccessMethod = credential.GetAccessTokenForRequestAsync
     }.Build();

Google 云平台身份验证问题

Problems with Google Cloud Platform authentication

c#

asp.net-core

google-cloud-platform

google-text-to-speech