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(PHP Extension) Get GMail SMTP OAuth2 Access Token for Desktop AppDemonstrates how to get a GMail SMTP OAuth2 access token from a desktop application or script, which can be used with the XOAUTH2 authentication method. This example requires a browser window to be displayed to allow the GMail account owner to authorize the access. The code for displaying the web browser is omitted. Suggestions for a few programming languages are provided in code comments. You'll need to find out how to display a web browser and navigate to the URL returned by the call to oauth2.StartAuth.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $oauth2 = new CkOAuth2(); // For Google OAuth2, set the listen port equal to the port used // in the Authorized Redirect URL for the Client ID. // For example, in this case the Authorized Redirect URL would be http://localhost:55568/ // Your app should choose a port not likely not used by any other application. $oauth2->put_ListenPort(55568); $oauth2->put_AuthorizationEndpoint('https://accounts.google.com/o/oauth2/v2/auth'); $oauth2->put_TokenEndpoint('https://www.googleapis.com/oauth2/v4/token'); // Replace these with actual values. $oauth2->put_ClientId('GOOGLE-CLIENT-ID'); $oauth2->put_ClientSecret('GOOGLE-CLIENT-SECRET'); $oauth2->put_CodeChallenge(true); $oauth2->put_CodeChallengeMethod('S256'); // This is the full-permissions scope for GMail. $oauth2->put_Scope('https://mail.google.com/'); // ------------------------------------------------------------------------------------------------------- // Important: Google claims there is a send-only scope: "https://www.googleapis.com/auth/gmail.send" // However, it has been found to NOT work when sending email using the SMTP protocol. // Perhaps it works for sending GMail using the GMail REST API, but it most certainly does not // provide access/authentication for sending email by SMTP. The full GMail scope is required. // In any case, it may be much easier to avoid using OAuth2 altogether and instead use "App Passwords". // See Send GMail with App Passwords. // ------------------------------------------------------------------------------------------------------- // Begin the OAuth2 three-legged flow. This returns a URL that should be loaded in a browser. $url = $oauth2->startAuth(); if ($oauth2->get_LastMethodSuccess() != true) { print $oauth2->lastErrorText() . "\n"; exit; } // At this point, your application should load the URL in a browser. // For example, // in C#: System.Diagnostics.Process.Start(url); // in Java: Desktop.getDesktop().browse(new URI(url)); // in VBScript: Set wsh=WScript.CreateObject("WScript.Shell") // wsh.Run url // in Xojo: ShowURL(url) (see http://docs.xojo.com/index.php/ShowURL) // in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl // The Google account owner would interactively accept or deny the authorization request. // Add the code to load the url in a web browser here... // Add the code to load the url in a web browser here... // Add the code to load the url in a web browser here... // Now wait for the authorization. // We'll wait for a max of 30 seconds. $numMsWaited = 0; while (($numMsWaited < 30000) and ($oauth2->get_AuthFlowState() < 3)) { $oauth2->SleepMs(100); $numMsWaited = $numMsWaited + 100; } // If there was no response from the browser within 30 seconds, then // the AuthFlowState will be equal to 1 or 2. // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser. // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response. // In that case, cancel the background task started in the call to StartAuth. if ($oauth2->get_AuthFlowState() < 3) { $oauth2->Cancel(); print 'No response from the browser!' . "\n"; exit; } // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred // The possible AuthFlowState values are: // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property. // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property. // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property. if ($oauth2->get_AuthFlowState() == 5) { print 'OAuth2 failed to complete.' . "\n"; print $oauth2->failureInfo() . "\n"; exit; } if ($oauth2->get_AuthFlowState() == 4) { print 'OAuth2 authorization was denied.' . "\n"; print $oauth2->accessTokenResponse() . "\n"; exit; } if ($oauth2->get_AuthFlowState() != 3) { print 'Unexpected AuthFlowState:' . $oauth2->get_AuthFlowState() . "\n"; exit; } // Save the full JSON access token response to a file. $sbJson = new CkStringBuilder(); $sbJson->Append($oauth2->accessTokenResponse()); $sbJson->WriteFile('qa_data/tokens/_gmailSmtp.json','utf-8',false); // The saved JSON response looks like this: // { // "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ", // "token_type": "Bearer", // "expires_in": 3600, // "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c" // } // print 'OAuth2 authorization granted!' . "\n"; print 'Access Token = ' . $oauth2->accessToken() . "\n"; ?> |
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