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(C) Google Drive Refresh Access TokenDemonstrates how to automatically refresh the access token when it expires.
#include <C_CkJsonObject.h> #include <C_CkOAuth2.h> #include <C_CkRest.h> #include <C_CkFileAccess.h> void ChilkatSample(void) { BOOL success; HCkJsonObject json; const char *tokenFilePath; HCkOAuth2 oauth2; HCkRest rest; BOOL bAutoReconnect; const char *jsonResponse; HCkFileAccess fac; success = TRUE; // It requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This example uses a previously obtained access token having permission for the // Google Drive scope. // The access token (and refresh token) was previously saved to a JSON file with this format: // See Get Google Drive OAuth2 Access Token // { // "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw", // "expires_in": 3600, // "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA", // "scope": "https://www.googleapis.com/auth/drive", // "token_type": "Bearer" // } json = CkJsonObject_Create(); tokenFilePath = "qa_data/tokens/googleDrive.json"; CkJsonObject_LoadFile(json,tokenFilePath); oauth2 = CkOAuth2_Create(); CkOAuth2_putAccessToken(oauth2,CkJsonObject_stringOf(json,"access_token")); CkOAuth2_putRefreshToken(oauth2,CkJsonObject_stringOf(json,"refresh_token")); rest = CkRest_Create(); // Connect using TLS. bAutoReconnect = TRUE; success = CkRest_Connect(rest,"www.googleapis.com",443,TRUE,bAutoReconnect); // Provide the authentication credentials (i.e. the access token) CkRest_SetAuthOAuth2(rest,oauth2); // We'll test with a simple request to empty trash. // If our access token expired, we'll get a 401 response.. jsonResponse = CkRest_fullRequestNoBody(rest,"DELETE","/drive/v3/files/trash"); if (CkRest_getLastMethodSuccess(rest) != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkJsonObject_Dispose(json); CkOAuth2_Dispose(oauth2); CkRest_Dispose(rest); return; } // If the access token expired, we'll get a 401 response status with this response body: // { // "error": { // "errors": [ // { // "domain": "global", // "reason": "authError", // "message": "Invalid Credentials", // "locationType": "header", // "location": "Authorization" // } // ], // "code": 401, // "message": "Invalid Credentials" // } // } if (CkRest_getResponseStatusCode(rest) == 401) { printf("Refreshing access token...\n"); 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_putScope(oauth2,"https://www.googleapis.com/auth/drive"); // Use OAuth2 to refresh the access token. success = CkOAuth2_RefreshAccessToken(oauth2); if (success != TRUE) { printf("%s\n",CkOAuth2_lastErrorText(oauth2)); CkJsonObject_Dispose(json); CkOAuth2_Dispose(oauth2); CkRest_Dispose(rest); return; } // Save the new access token to our XML file (so we can refresh it again when needed). CkJsonObject_UpdateString(json,"access_token",CkOAuth2_accessToken(oauth2)); fac = CkFileAccess_Create(); CkFileAccess_WriteEntireTextFile(fac,tokenFilePath,CkJsonObject_emit(json),"utf-8",FALSE); printf("Access Token Refreshed!\n"); // Retry the request with the new access token.. jsonResponse = CkRest_fullRequestNoBody(rest,"DELETE","/drive/v3/files/trash"); if (CkRest_getLastMethodSuccess(rest) != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkJsonObject_Dispose(json); CkOAuth2_Dispose(oauth2); CkRest_Dispose(rest); CkFileAccess_Dispose(fac); return; } } // A successful response will have a status code equal to 204 and the response body is empty. // (If not successful, then there should be a JSON response body with information..) if (CkRest_getResponseStatusCode(rest) != 204) { printf("response status code = %d\n",CkRest_getResponseStatusCode(rest)); printf("response status text = %s\n",CkRest_responseStatusText(rest)); printf("response header: %s\n",CkRest_responseHeader(rest)); printf("response JSON: %s\n",jsonResponse); CkJsonObject_Dispose(json); CkOAuth2_Dispose(oauth2); CkRest_Dispose(rest); CkFileAccess_Dispose(fac); return; } printf("Trash Emptied!\n"); CkJsonObject_Dispose(json); CkOAuth2_Dispose(oauth2); CkRest_Dispose(rest); CkFileAccess_Dispose(fac); } |
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