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(Java) Get Google API Access Token using JSON Private KeyDemonstrates how to get a Google API access token using a JSON service account private key.
import com.chilkatsoft.*; public class ChilkatExample { static { try { System.loadLibrary("chilkat"); } catch (UnsatisfiedLinkError e) { System.err.println("Native code library failed to load.\n" + e); System.exit(1); } } public static void main(String argv[]) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // -------------------------------------------------------------------------------- // For a step-by-step guide for setting up your Google Workspace service account, // see Setup Google Workspace Account for Sending SMTP GMail from a Service Account // -------------------------------------------------------------------------------- // First load the JSON key into a string. CkFileAccess fac = new CkFileAccess(); String jsonKey = fac.readEntireTextFile("qa_data/googleApi/chilkat25-b4214220e565.json","utf-8"); if (fac.get_LastMethodSuccess() != true) { System.out.println(fac.lastErrorText()); return; } // A Google service account JSON private key looks like this: // { // "type": "service_account", // "project_id": "chilkat25", // "private_key_id": "b4214220f565881e19eeb97c2699bf5a0d1e3e0b", // "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvQ...NXcM=\n-----END PRIVATE KEY-----\n", // "client_email": "chilkatsvc@chilkat25.iam.gserviceaccount.com", // "client_id": "109122032928932715958", // "auth_uri": "https://accounts.google.com/o/oauth2/auth", // "token_uri": "https://oauth2.googleapis.com/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/chilkatsvc%40chilkat25.iam.gserviceaccount.com", // "universe_domain": "googleapis.com" // } CkAuthGoogle gAuth = new CkAuthGoogle(); gAuth.put_JsonKey(jsonKey); // Specify a scope. gAuth.put_Scope("https://mail.google.com/"); // Request an access token that is valid for this many seconds. gAuth.put_ExpireNumSeconds(3600); // When using a Google Workspace account with Gmail APIs, a service account can impersonate a user // via a process called domain-wide delegation — and the "sub" claim in the JWT is what enables this. // Domain-wide delegation allows a Google Workspace administrator to authorize a service account to // act on behalf of any user in the domain, without user interaction. // This is required for server-to-server access to user data — such as reading/sending Gmail from a background service. // This is your company email address. gAuth.put_SubEmailAddress("info@chilkat.xyz"); // Connect to www.googleapis.com using TLS CkSocket tlsSock = new CkSocket(); boolean success = tlsSock.Connect("www.googleapis.com",443,true,5000); if (success != true) { System.out.println(tlsSock.lastErrorText()); return; } // Send the request to obtain the access token. success = gAuth.ObtainAccessToken(tlsSock); if (success != true) { System.out.println(gAuth.lastErrorText()); return; } // Examine the access token: String accessToken = gAuth.accessToken(); System.out.println("Access Token: " + accessToken); // Sample output: // ya29.a0AW4XtxjGTD67Z8 .... IRw0218 // The access token allows us to send unlimited emails while it's valid. Once it expires, we must obtain and use a new one. // ----------------------------------------------------------------------- CkMailMan mailman = new CkMailMan(); // Set the properties for the GMail SMTP server: mailman.put_SmtpHost("smtp.gmail.com"); mailman.put_SmtpPort(587); mailman.put_StartTLS(true); mailman.put_SmtpUsername("info@chilkat.xyz"); mailman.put_OAuth2AccessToken(accessToken); // Create a new email object CkEmail email = new CkEmail(); email.put_Subject("This is a test"); email.put_Body("This is a test"); email.put_From("Chilkat Test <info@chilkat.xyz>"); success = email.AddTo("Chilkat Software","info@chilkatsoft.com"); // To add more recipients, call AddTo, AddCC, or AddBcc once per recipient. success = mailman.SendEmail(email); if (success != true) { System.out.println(mailman.lastErrorText()); return; } success = mailman.CloseSmtpConnection(); if (success != true) { System.out.println("Connection to SMTP server not closed cleanly."); } System.out.println("Successfully sent email using Gmail with a service account key."); } } |
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