How do I refresh OAuth tokens automatically in Swift?

In Swift, refreshing OAuth tokens automatically can be achieved by implementing a method that checks the token's expiration status and requests a new token when necessary. Below is an example of how to implement this logic using URLSession for making the token refresh request.

let tokenRefreshURL = URL(string: "https://example.com/oauth/token")! func refreshTokenIfNeeded() { guard let token = getToken(), !isTokenExpired(token) else { return } var request = URLRequest(url: tokenRefreshURL) request.httpMethod = "POST" let parameters = [ "grant_type": "refresh_token", "refresh_token": token.refreshToken ] request.httpBody = parameters.percentEncoded() request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type") let task = URLSession.shared.dataTask(with: request) { data, response, error in guard let data = data, error == nil else { print("Error refreshing token: \(error?.localizedDescription ?? "Unknown error")") return } do { let newToken = try JSONDecoder().decode(Token.self, from: data) saveToken(newToken) } catch { print("Failed to decode new token: \(error)") } } task.resume() } func getToken() -> Token? { // Retrieve the current token from storage, e.g., UserDefaults } func saveToken(_ token: Token) { // Save the new token to storage, e.g., UserDefaults } func isTokenExpired(_ token: Token) -> Bool { // Logic to check if the token is expired }

Refresh OAuth tokens Swift OAuth Automatic token refresh Swift OAuth token management URLSession Swift

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