SignInMethod Implementation for Passkeys

SignInMethod.swift

func signInWith(anchor: ASPresentationAnchor, preferImmediatelyAvailableCredentials: Bool) {
        self.authenticationAnchor = anchor
        let publicKeyCredentialProvider = ASAuthorizationPlatformPublicKeyCredentialProvider(relyingPartyIdentifier: domain)

        // Fetch the challenge from the server. The challenge needs to be unique for each request.
        let challenge = Data()

        let assertionRequest = publicKeyCredentialProvider.createCredentialAssertionRequest(challenge: challenge)

        // Also allow the user to use a saved password, if they have one.
        let passwordCredentialProvider = ASAuthorizationPasswordProvider()
        let passwordRequest = passwordCredentialProvider.createRequest()

        // Pass in any mix of supported sign-in request types.
        let authController = ASAuthorizationController(authorizationRequests: [ assertionRequest, passwordRequest ] )
        authController.delegate = self
        authController.presentationContextProvider = self

        if preferImmediatelyAvailableCredentials {
            // If credentials are available, presents a modal sign-in sheet.
            // If there are no locally saved credentials, no UI appears and
            // the system passes ASAuthorizationError.Code.canceled to call
            // `AccountManager.authorizationController(controller:didCompleteWithError:)`.
            authController.performRequests(options: .preferImmediatelyAvailableCredentials)
        } else {
            // If credentials are available, presents a modal sign-in sheet.
            // If there are no locally saved credentials, the system presents a QR code to allow signing in with a
            // passkey from a nearby device.
            authController.performRequests()
        }

        isPerformingModalReqest = true
    }