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authentication

Implement iOS authentication workflows with AuthenticationServices APIs.

Updated May 6, 2026
Search Tags:#authentication#oauth#ios#biometrics#sign in with apple#jwt validation#credential state
One-click install
npx skills add https://github.com/Roy-wonji/claude-config --skill authentication-roy-wonji
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: authentication
Source: https://github.com/Roy-wonji/claude-config/tree/main/skills/swift-ios-skills/skills/authentication
Command: npx skills add https://github.com/Roy-wonji/claude-config --skill authentication-roy-wonji

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps you implement iOS authentication flows correctly and securely, especially for Sign in with Apple, OAuth web auth, credential state checks, token validation, and biometric re-auth.

Core Features & Use Cases

  • Sign in with Apple (ASAuthorization) integration*: Implement the authorization controller, handle Apple ID credentials, and manage first-auth vs subsequent-auth data (email/fullName availability rules).
  • Credential state checking & revocation handling: Check credential state on app launch and respond to revocation notifications by signing out and clearing local state.
  • Server-side identity token validation guidance: Validate JWT identity tokens using Apple JWKS rules (iss/aud/exp) rather than trusting tokens client-side.
  • OAuth using ASWebAuthenticationSession: Run third-party login flows via system web auth (no WKWebView), extract authorization codes, and exchange them for tokens.
  • Password AutoFill + biometrics support: Offer saved credentials using ASAuthorizationPasswordProvider with correct textContentType setup, and protect sensitive storage with LAContext.

Quick Start

Use the authentication skill to design your Sign in with Apple + OAuth login architecture for iOS by covering credential state, identityToken handling, and biometric/keychain integration end-to-end.

Frequently Asked Questions about authentication

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement Sign in with Apple credential state checking on app launch?▼

Sign in with Apple credential state checking verifies user authorization status on app launch. You check the credential state via ASAuthorizationController and respond to revocation notifications by signing out and clearing local Keychain state for secure session restoration.

How do I validate Apple identityToken server-side using JWKS?▼

Validating Apple identityToken server-side requires checking JWT claims against Apple JWKS rules for iss, aud, and exp. You must validate tokens server-side rather than trusting them client-side to ensure secure authentication flows.

What's the best way to handle Sign in with Apple first-authorization email and fullName data?▼

Handling Sign in with Apple first-authorization data requires caching email and fullName fields during the initial authorization. On subsequent authentications these fields are unavailable, so you must cache them correctly during the first ASAuthorizationController callback.

Does iOS OAuth web sign-in require ASWebAuthenticationSession instead of WKWebView?▼

iOS OAuth web sign-in requires using ASWebAuthenticationSession rather than WKWebView. You run third-party login flows via the system web auth session, extract authorization codes, and exchange them for tokens securely without embedding a web view.

How do I implement Password AutoFill with ASAuthorizationPasswordProvider and biometrics?▼

Implementing Password AutoFill uses ASAuthorizationPasswordProvider with correct textContentType setup to offer saved credentials. You protect sensitive storage with LAContext biometric re-authentication and Keychain patterns for secure access.

When should I handle Apple ID credential revocation notifications in my iOS app?▼

Handling Apple ID credential revocation notifications is needed when users may revoke access outside your app. You respond to revocation notifications by signing out and clearing local state, ensuring credential state checking runs on app launch for production login screens.

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