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(Swift 3,4,5...) Google Drive Refresh Access TokenDemonstrates how to automatically refresh the access token when it expires.
func chilkatTest() { var success: Bool = 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" // } let json = CkoJsonObject()! var tokenFilePath: String? = "qa_data/tokens/googleDrive.json" json.loadFile(tokenFilePath) let oauth2 = CkoOAuth2()! oauth2.accessToken = json.string(of: "access_token") oauth2.refreshToken = json.string(of: "refresh_token") let rest = CkoRest()! // Connect using TLS. var bAutoReconnect: Bool = true success = rest.connect("www.googleapis.com", port: 443, tls: true, autoReconnect: bAutoReconnect) // Provide the authentication credentials (i.e. the access token) rest.setAuthOAuth2(oauth2) // We'll test with a simple request to empty trash. // If our access token expired, we'll get a 401 response.. var jsonResponse: String? = rest.fullRequestNoBody("DELETE", uriPath: "/drive/v3/files/trash") if rest.lastMethodSuccess != true { print("\(rest.lastErrorText!)") 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 rest.responseStatusCode.intValue == 401 { print("Refreshing access token...") oauth2.authorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth" oauth2.tokenEndpoint = "https://www.googleapis.com/oauth2/v4/token" // Replace these with actual values. oauth2.clientId = "GOOGLE-CLIENT-ID" oauth2.clientSecret = "GOOGLE-CLIENT-SECRET" oauth2.scope = "https://www.googleapis.com/auth/drive" // Use OAuth2 to refresh the access token. success = oauth2.refreshAccessToken() if success != true { print("\(oauth2.lastErrorText!)") return } // Save the new access token to our XML file (so we can refresh it again when needed). json.update("access_token", value: oauth2.accessToken) let fac = CkoFileAccess()! fac.writeEntireTextFile(tokenFilePath, fileData: json.emit(), charset: "utf-8", includePreamble: false) print("Access Token Refreshed!") // Retry the request with the new access token.. jsonResponse = rest.fullRequestNoBody("DELETE", uriPath: "/drive/v3/files/trash") if rest.lastMethodSuccess != true { print("\(rest.lastErrorText!)") 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 rest.responseStatusCode.intValue != 204 { print("response status code = \(rest.responseStatusCode.intValue)") print("response status text = \(rest.responseStatusText!)") print("response header: \(rest.responseHeader!)") print("response JSON: \(jsonResponse!)") return } print("Trash Emptied!") } |
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