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(Mono C#) Get Google API Access Token using JSON Private Key using NIST Time Server Date/TimeDemonstrates how to get a Google API access token using a JSON service account private key, using the NIST time server date/time rather than the local system date/time.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // First, let's get the current date/time from time-c.nist.gov Chilkat.Socket socket = new Chilkat.Socket(); // Connect to an NIST time server and read the current date/time int maxWaitMs = 8000; bool useTls = false; bool success = socket.Connect("time-c.nist.gov",37,useTls,maxWaitMs); if (success != true) { Debug.WriteLine(socket.LastErrorText); return; } // The time server will send a big-endian 32-bit integer representing // the number of seconds since since 00:00 (midnight) 1 January 1900 GMT. // The ReceiveInt32 method will receive a 4-byte integer, but returns // true or false to indicate success. If successful, the integer // is obtained via the ReceivedInt property. bool bigEndian = true; success = socket.ReceiveInt32(bigEndian); if (success != true) { Debug.WriteLine(socket.LastErrorText); return; } Chilkat.CkDateTime dt = new Chilkat.CkDateTime(); dt.SetFromNtpTime(socket.ReceivedInt); // Show the current local date/time bool bLocalTime = true; Debug.WriteLine("Current local date/time: " + dt.GetAsRfc822(bLocalTime)); maxWaitMs = 10; socket.Close(maxWaitMs); // ------------------------------------------------------------------------ // OK, we have the current date/time. We'll use it to set the IAT property // in the code below. // First load the JSON key into a string. Chilkat.FileAccess fac = new Chilkat.FileAccess(); string jsonKey = fac.ReadEntireTextFile("qa_data/googleApi/ChilkatTest-ab2ecd52ef98.json","utf-8"); if (fac.LastMethodSuccess != true) { Debug.WriteLine(fac.LastErrorText); return; } // A JSON private key should look like this: // { // "type": "service_account", // "project_id": "chilkattest-1350", // "private_key_id": "fa2e36ee26986eab628b59868af8bec1d1c64c38", // "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvgIjFa...28N64N2n1E4FYzBZjSdy\n-----END PRIVATE KEY-----\n", // "client_email": "598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a@developer.gserviceaccount.com", // "client_id": "598922945226-00rb0ppfg0snd9jo7bhvd4v17jtj2d3a.apps.googleusercontent.com", // "auth_uri": "https://accounts.google.com/o/oauth2/auth", // "token_uri": "https://accounts.google.com/o/oauth2/token", // "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs", // "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a%40developer.gserviceaccount.com" // } Chilkat.AuthGoogle gAuth = new Chilkat.AuthGoogle(); gAuth.JsonKey = jsonKey; // Choose a scope. gAuth.Scope = "https://www.googleapis.com/auth/cloud-platform"; // Request an access token that is valid for this many seconds. gAuth.ExpireNumSeconds = 3600; // If the application is requesting delegated access: // The email address of the user for which the application is requesting delegated access, // then set the email address here. (Otherwise leave it empty.) gAuth.SubEmailAddress = ""; // ------------------------------------------------------------------------ // Set the IAT using the date/time from the NIST time server. int unixTime = dt.GetAsUnixTime(false); Debug.WriteLine("unixTime = " + Convert.ToString(unixTime)); gAuth.Iat = unixTime; // Connect to www.googleapis.com using TLS (TLS 1.2 is the default.) // The Chilkat socket object is used so that the connection can be established // through proxies or an SSH tunnel if desired. Chilkat.Socket tlsSock = new Chilkat.Socket(); bool success = tlsSock.Connect("www.googleapis.com",443,true,5000); if (success != true) { Debug.WriteLine(tlsSock.LastErrorText); return; } // Send the request to obtain the access token. success = gAuth.ObtainAccessToken(tlsSock); if (success != true) { Debug.WriteLine(gAuth.LastErrorText); return; } // Examine the access token: Debug.WriteLine("Access Token: " + gAuth.AccessToken); |
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