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(C) Get a Google Contacts OAuth2 Access TokenDemonstrates how to get a Google Contacts OAuth2 access token from a desktop application or script.
#include <C_CkOAuth2.h> #include <C_CkStringBuilder.h> void ChilkatSample(void) { HCkOAuth2 oauth2; BOOL success; const char *url; int numMsWaited; HCkStringBuilder sbJson; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. oauth2 = CkOAuth2_Create(); // For Google OAuth2, set the ListenPort equal to the port specified in the authorized callback URI for the ClientID. // See http://cknotes.com/setup-google-account-for-google-drive-api-walkthrough/ CkOAuth2_putListenPort(oauth2,55568); CkOAuth2_putAuthorizationEndpoint(oauth2,"https://accounts.google.com/o/oauth2/v2/auth"); CkOAuth2_putTokenEndpoint(oauth2,"https://www.googleapis.com/oauth2/v4/token"); // Replace these with actual values. CkOAuth2_putClientId(oauth2,"GOOGLE-CLIENT-ID"); CkOAuth2_putClientSecret(oauth2,"GOOGLE-CLIENT-SECRET"); CkOAuth2_putCodeChallenge(oauth2,TRUE); CkOAuth2_putCodeChallengeMethod(oauth2,"S256"); // These are the scopes for Google Contacts: // https://www.google.com/m8/feeds/ read/write access to Contacts and Contact Groups // https://www.googleapis.com/auth/contacts.readonly read-only access to Contacts and Contact Groups CkOAuth2_putScope(oauth2,"https://www.google.com/m8/feeds/"); // Begin the OAuth2 three-legged flow. This returns a URL that should be loaded in a browser. url = CkOAuth2_startAuth(oauth2); if (CkOAuth2_getLastMethodSuccess(oauth2) != TRUE) { printf("%s\n",CkOAuth2_lastErrorText(oauth2)); CkOAuth2_Dispose(oauth2); 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. numMsWaited = 0; while ((numMsWaited < 30000) && (CkOAuth2_getAuthFlowState(oauth2) < 3)) { CkOAuth2_SleepMs(oauth2,100); 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 (CkOAuth2_getAuthFlowState(oauth2) < 3) { CkOAuth2_Cancel(oauth2); printf("No response from the browser!\n"); CkOAuth2_Dispose(oauth2); 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 (CkOAuth2_getAuthFlowState(oauth2) == 5) { printf("OAuth2 failed to complete.\n"); printf("%s\n",CkOAuth2_failureInfo(oauth2)); CkOAuth2_Dispose(oauth2); return; } if (CkOAuth2_getAuthFlowState(oauth2) == 4) { printf("OAuth2 authorization was denied.\n"); printf("%s\n",CkOAuth2_accessTokenResponse(oauth2)); CkOAuth2_Dispose(oauth2); return; } if (CkOAuth2_getAuthFlowState(oauth2) != 3) { printf("Unexpected AuthFlowState:%d\n",CkOAuth2_getAuthFlowState(oauth2)); CkOAuth2_Dispose(oauth2); return; } // Save the full JSON access token response to a file. sbJson = CkStringBuilder_Create(); CkStringBuilder_Append(sbJson,CkOAuth2_accessTokenResponse(oauth2)); CkStringBuilder_WriteFile(sbJson,"qa_data/tokens/googleContacts.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" // } // printf("OAuth2 authorization granted!\n"); printf("Access Token = %s\n",CkOAuth2_accessToken(oauth2)); CkOAuth2_Dispose(oauth2); CkStringBuilder_Dispose(sbJson); } |
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