我在 Big Query 和 API 访问窗格中创建了一个项目,我创建了服务帐户,以便我可以代表用户交互通过 Windows 应用程序访问 Big Query API。由于我是使用和访问 Google API 的新手,因此我想知道基本步骤,以便我可以通过 Windows 服务访问 Big Query。
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这里有一些使用基于 Web 的 OAuth 流的 .NET 代码示例: Google BigQuery with .NET documentation/samples
有关在 .NET 中使用服务帐户的另一个开发人员的示例,请参见: Google OAuth2 服务帐户访问令牌请求给出“无效请求”响应
这些在 .NET 库之上手动实现服务帐户。.NET 库最近添加了对服务帐户的本机支持,但我还没有找到官方示例。
这是一个使用 Analytics API 的非官方示例。它应该直接类似于在 BigQuery 中使用服务帐户: 如何使用服务帐户通过 .NET C# 访问 Google Analytics API V3?
于 2012-10-20T23:40:37.550 回答
0
最后,这是 Big Query API 的身份验证过程和从 Big Query 表中检索记录的工作代码:-
我创建了一个具有返回类型方法的类OAuth2Authenticator<AssertionFlowClient>
。
internal class clsGetOAuth2Authentication
{
public OAuth2Authenticator<AssertionFlowClient> objGetOAuth2(string strPrivateFilePath, string strPrivateFilePassword, string strServiceAccEmailId,string strScope)
{
AuthorizationServerDescription objAuthServerDesc;
X509Certificate2 objKey;
AssertionFlowClient objClient;
OAuth2Authenticator<AssertionFlowClient> objAuth = null;
string ScopeUrl = "https://www.googleapis.com/auth/" + strScope;
string strSrvAccEmailId = strServiceAccEmailId;
string strKeyFile = strPrivateFilePath; //KeyFile: This is the physical path to the key file you downloaded when you created your Service Account.
string strKeyPassword = (strPrivateFilePassword != "") ? strPrivateFilePassword : "notasecret"; //key_pass: This is probably the password for all key files, but if you're given a different one, use that.
objAuthServerDesc = GoogleAuthenticationServer.Description; //objAuthServerDesc: Description of the server that will grant Authentiation.
objKey = new X509Certificate2(strKeyFile, strKeyPassword, X509KeyStorageFlags.Exportable); //objkey: Load up and decrypt the key.
objClient = new AssertionFlowClient(objAuthServerDesc, objKey) { ServiceAccountId = strSrvAccEmailId, Scope = ScopeUrl }; //objClient: Using the AssertionFlowClient, because we're logging in with our certificate.
objAuth = new OAuth2Authenticator<AssertionFlowClient>(objClient, AssertionFlowClient.GetState); //objAuth: Requesting Authentication.
return objAuth;
}
}
现在,另一个类调用上述方法:-
clsGetOAuth2Authentication objOAuth2 = new clsGetOAuth2Authentication();
try
{
var objAuth = objOAuth2.objGetOAuth2(strKeyFile, strKeyPassword, strSrvAccEmailId, strScope); //Authentication data returned
objBQServ = new BigqueryService(objAuth); //Instantiate BigQueryService with credentials(objAuth) as its parameter
#region Retrieving Records:-
JobsResource j = objBQServ.Jobs;
QueryRequest qr = new QueryRequest();
qr.Query = strQuery;
DateTime dtmBegin = DateTime.UtcNow;
QueryResponse response = j.Query(qr, strProjId).Fetch();
DateTime dtmEnd = DateTime.UtcNow;
string strColHead = "";
foreach (var colHeaders in response.Schema.Fields)
{
strColHead += colHeaders.Name.ToString() + "\t";
}
Console.WriteLine(strColHead);
int intCount = 0;
foreach (TableRow row in response.Rows)
{
intCount += 1;
List<string> list = new List<string>();
foreach (var field in row.F)
{
list.Add(field.V);
}
Console.WriteLine(String.Join("\t", list));
}
TimeSpan tsElapsed = dtmEnd - dtmBegin;
Console.WriteLine("\n" + "Total no. of records:- " + intCount + ". Time taken:- " + tsElapsed);
#endregion
}
catch (Exception ex)
{
Console.WriteLine("Error Occured!" + "\n\n" + "Statement:- " + ex.Message.ToString() + "\n\n" + "Description:- " + ex.ToString() + "\n\n");
Console.WriteLine("\nPress enter to exit");
Console.ReadLine();
}
于 2012-11-07T06:23:08.803 回答