import { createContext , useContext , useState } from 'react' ; import jwtDecode from 'jwt-decode' ; interface JwtUser { userId : string ; avatarUrl : string ; userName : string ; } const AuthContext = createContext < { loggedIn : boolean ; user ? : JwtUser ; login ( token ) : void ; logout ( ) : void ; } > ( { loggedIn : false , login : ( ) => null , logout : ( ) => null } ) ; interface AuthProviderProps { children : React . ReactNode ; } const AuthProvider = ( { children } ) => { const [ state , setState ] = useState < { loggedIn : boolean ; user ? : JwtUser ; } > ( ( ) => { const token = localStorage . getItem ( 'accessToken' ) ; let decodedToken ; if ( token ) { try { decodedToken = jwtDecode < JwtUser > ( token ) ; } catch ( e ) { } } return { loggedIn : Boolean ( token ) , user : decodedToken ? { userId : decodedToken . userId , avatarUrl : decodedToken . avatarUrl , userName : decodedToken . userName , } : undefined , } ; } ) ; const login = ( token ) => { localStorage . setItem ( 'accessToken' , token ) ; const decodedToken = jwtDecode < JwtUser > ( token ) ; setState ( { loggedIn : true , user : { userId : decodedToken . userId , avatarUrl : decodedToken . avatarUrl , userName : decodedToken . userName , } , } ) ; } ; const logout = ( ) => { localStorage . removeItem ( 'accessToken' ) ; window . location . href = '/' ; } ; return ( < AuthContext . Provider value = { { loggedIn : state . loggedIn , user : state . user , login , logout , } } > { children } < /AuthContext.Provider>); } ; const useAuth = ( ) => useContext ( AuthContext ) ; export { AuthProvider , useAuth } ;