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(C++) Get a Google Drive OAuth2 Access TokenDemonstrates how to get a Google Drive OAuth2 access token from a desktop application or script.
#include <CkOAuth2.h> #include <CkStringBuilder.h> void ChilkatSample(void) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkOAuth2 oauth2; bool success; // 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"); // See more scopes at https://developers.google.com/identity/protocols/googlescopes oauth2.put_Scope("https://www.googleapis.com/auth/drive"); // Begin the OAuth2 three-legged flow. This returns a URL that should be loaded in a browser. const char *url = oauth2.startAuth(); if (oauth2.get_LastMethodSuccess() != true) { std::cout << oauth2.lastErrorText() << "\r\n"; return; } // 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 QuickBooks 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. int numMsWaited = 0; while ((numMsWaited < 30000) && (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(); std::cout << "No response from the browser!" << "\r\n"; return; } // 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) { std::cout << "OAuth2 failed to complete." << "\r\n"; std::cout << oauth2.failureInfo() << "\r\n"; return; } if (oauth2.get_AuthFlowState() == 4) { std::cout << "OAuth2 authorization was denied." << "\r\n"; std::cout << oauth2.accessTokenResponse() << "\r\n"; return; } if (oauth2.get_AuthFlowState() != 3) { std::cout << "Unexpected AuthFlowState:" << oauth2.get_AuthFlowState() << "\r\n"; return; } // Save the full JSON access token response to a file. CkStringBuilder sbJson; sbJson.Append(oauth2.accessTokenResponse()); sbJson.WriteFile("qa_data/tokens/googleDrive.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" // } // std::cout << "OAuth2 authorization granted!" << "\r\n"; std::cout << "Access Token = " << oauth2.accessToken() << "\r\n"; } |
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