来自C#/.NET服务的Google Play Android Developer API - (400)错误请求

Question

我正在尝试使用Google API .NET Client Library 从我的ASP.NET Web服务器访问Purchase Status API,这是使用Purchase API v1.1的推荐方法.但是,此API 的" 授权"页面建议直接向Google的OAuth2页面发送Web请求,而不是使用相应的客户端库.

好吧,我尝试了两种方法,我想到了所有变化,它们都导致"远程服务器返回错误:(400)错误请求.".

现在我做了什么来达到我的观点.首先,我在授权页面的创建API控制台项目下完成了所有步骤1-8.接下来,我按照那里的描述生成了刷新令牌.在刷新令牌生成期间,我选择了与用于发布我的Android应用程序相同的Google帐户(现在处于已发布的测试版状态).

接下来我在Visual Studio中创建了一个用于测试目的的控制台C#应用程序(可能是控制台应用程序有问题吗？)并尝试使用此代码调用Purchase API(在某些Google API示例中找到):

    private static void Main(string[] args)
    {
        var provider =
            new WebServerClient(GoogleAuthenticationServer.Description)
                {
                    ClientIdentifier = "91....751.apps.googleusercontent.com",
                    ClientSecret = "wRT0Kf_b....ow"
                };
        var auth = new OAuth2Authenticator<WebServerClient>(
            provider, GetAuthorization);

        var service = new AndroidPublisherService(
            new BaseClientService.Initializer()
                {
                    Authenticator = auth,
                    ApplicationName = APP_NAME
                });

        var request = service.Inapppurchases.Get(
            PACKAGE_NAME, PRODUCT_ID, PURCHASE_TOKEN);
        var purchaseState = request.Execute();

        Console.WriteLine(JsonConvert.SerializeObject(purchaseState));
    }

    private static IAuthorizationState GetAuthorization(WebServerClient client)
    {
        IAuthorizationState state =
            new AuthorizationState(
                new[] {"https://www.googleapis.com/auth/androidpublisher"})
                {
                    RefreshToken = "4/lWX1B3nU0_Ya....gAI"
                };

        // below is my redirect URI which I used to get a refresh token
        // I tried with and without this statement
        state.Callback = new Uri("https://XXXXX.com/oauth2callback/");

        client.RefreshToken(state); // <-- Here we have (400) Bad request
        return state;
    }

然后我尝试使用此代码获取访问令牌(我在此处找到它:Google Calendar API - 错误请求(400)尝试交换访问令牌代码):

    public static string GetAccessToken()
    {
        var request = WebRequest.Create(
            "https://accounts.google.com/o/oauth2/token");
        request.Method = "POST";
        var postData =
            string.Format(
                @"code={0}&client_id={1}&client_secret={2}&redirect_uri={3}&grant_type=authorization_code",
            // refresh token I got from browser
            // also tried with Url encoded value
            // 4%2FlWX1B3nU0_Yax....gAI
                "4/lWX1B3nU0_Yax....gAI",
            // ClientID from Google APIs Console
                "919....1.apps.googleusercontent.com",
            // Client secret from Google APIs Console
                "wRT0Kf_bE....w",
            // redirect URI from Google APIs Console
            // also tried Url encoded value
            // https%3A%2F%2FXXXXX.com%2Foauth2callback%2F
                "https://XXXXX.com/oauth2callback/");

        byte[] byteArray = Encoding.UTF8.GetBytes(postData);
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = byteArray.Length;
        using (var dataStream = request.GetRequestStream())
        {
            dataStream.Write(byteArray, 0, byteArray.Length);
            dataStream.Close();
        }
        try
        {
            // request.GetResponse() --> (400) Bad request again!
            using (var response = request.GetResponse())
            {
                using (var dataStream = response.GetResponseStream())
                {
                    using (var reader = new StreamReader(dataStream))
                    {
                        var responseFromServer = reader.ReadToEnd();
                        var jsonResponse = JsonConvert.DeserializeObject<OAuth2Response>(responseFromServer);
                        return jsonResponse.access_token;
                    }
                }
            }
        }
        catch (Exception ex) { var x = ex; }
        return null;
    }

所以,总结我所有的长篇故事:

1. 是否可以使用上述任一方法从C#控制台应用程序(无需用户交互)传递OAuth2授权？
2. 我已经仔细检查了重定向URI(因为我在stackoverflow上看到了很多讨论的麻烦)以及ClientID和ClientSecret等其他参数.我在上面的代码中还能做些什么呢？
3. 我是否需要在刷新令牌中对斜杠进行URL编码(我看到使用客户端库的第一个方法是这样做的)？
4. 实现我的最终目标的推荐方法是什么(从ASP.NET Web服务器购买API访问)？

Answer 1

我会尽力回答你的上一个问题.如果您访问自己的数据帐户,则无需在oAuth2中使用客户端ID.我们使用服务帐户访问Google Play API.

1. 创建服务帐户Google Developer Console> Your project> APIs and auth> Credentials> Create a new key.您将下载一个p12密钥.
2. 创建一个C#项目.您可以选择控制台应用程序
3. 从Google.Apis.androidpublisher安装google play api库.努特.您可以在Google API Client Library for .NET中找到其他dotnet 库

4. 在API访问中将google api项目与您的Google Play帐户相关联

5. 验证并尝试查询信息.我将尝试列出所有inapp项目.您只需更改即可获得购买状态

   String serviceAccountEmail = "your-mail-in-developer-console@developer.gserviceaccount.com";
   
       var certificate = new X509Certificate2(@"physical-path-to-your-key\key.p12", "notasecret", X509KeyStorageFlags.Exportable);
   
       ServiceAccountCredential credential = new ServiceAccountCredential(
          new ServiceAccountCredential.Initializer(serviceAccountEmail)
          {
              Scopes = new[] { "https://www.googleapis.com/auth/androidpublisher" }
          }.FromCertificate(certificate));
   
   
       var service = new AndroidPublisherService(
      new BaseClientService.Initializer()
      {
          HttpClientInitializer = credential,
          ApplicationName = "GooglePlay API Sample",
      });
   // try catch this function because if you input wrong params ( wrong token) google will return error.
       var request = service.Inappproducts.List("your-package-name");
       var purchaseState = request.Execute();
   
      // var request = service.Purchases.Products.Get(
      //"your-package-name", "your-inapp-item-id", "purchase-token"); get purchase'status
   
   
   
       Console.WriteLine(JsonConvert.SerializeObject(purchaseState));