每次刷新页面时如何加载用户？

Question

How can i make the relevant asp.net controller for this? I have added the 'load user' functions to App.js also. What I want is to load the user every time the page is refreshed. The login function is working properly but when the page is refreshed the authentication will be null again.

"export const loadUser = () => async (dispatch) => {
 if (localStorage.token) {
   setAuthToken(localStorage.token);
     
}

 try {
  const res = await axios.get('https://localhost:5001/api/auth/user');
   dispatch({
    type: USER_LOADED,
    payload: res.data,
   });
} catch (err) {
   dispatch({
     type: AUTH_ERROR,
 });
}
};"

This is the login page

import React, { useState } from 'react';
import Avatar from '@material-ui/core/Avatar';
import Button from '@material-ui/core/Button';
import TextField from '@material-ui/core/TextField';
import FormControlLabel from '@material-ui/core/FormControlLabel';
import Checkbox from '@material-ui/core/Checkbox';
import Link from '@material-ui/core/Link';
import Paper from '@material-ui/core/Paper';
import Box from '@material-ui/core/Box';
import Grid from '@material-ui/core/Grid';
import LockOutlinedIcon from '@material-ui/icons/LockOutlined';
import Typography from '@material-ui/core/Typography';
import { makeStyles } from '@material-ui/core/styles';
import { pink } from '@material-ui/core/colors';
import { connect } from 'react-redux';
import { setAlert } from '../../actions/alert';
import PropTypes from 'prop-types';
import {login} from '../../actions/auth'
import { Redirect } from 'react-router-dom'

function Copyright() {
  return (
    <Typography variant="body2" color="textSecondary" align="center">
      {'Copyright © '}
      <Link color="primary" href="./">
        NoQueue Website
      </Link>{' '}
      {new Date().getFullYear()}
      {'.'}
    </Typography>
  );
}

const useStyles = makeStyles((theme) => ({
  root: {
    height: '100vh',
  },
  image: {
    backgroundImage: 'url(https://invention.si.edu/sites/default/files/styles/story_banner_image/public/blog-guest-fox-susannah-2017-03-09-shutterstock_189632216-banner-edit.jpg?itok=eNxGJoO4)',
    backgroundSize: 'cover',
    backgroundPosition: 'center',
  },
  paper: {
    margin: theme.spacing(8, 4),
    display: 'flex',
    flexDirection:'column',
    alignItems: 'center',
  },
  avatar: {
    margin: theme.spacing(1),
    backgroundColor: pink.A700,
  },
  form: {
    width: '100%',
    marginTop: theme.spacing(2),
  },
  submit: {
    margin: theme.spacing(3,0,2),
  },

}));

const SignIn = ({setAlert,login,isAuthenticated,user}) => {

  const [formData, setFormData] = useState({
    email:"",
    password:"",
  })

const{email,password}=formData; 

const onChange=e=>setFormData(
  {
    ...formData, [e.target.name]:e.target.value
  }
)

const onSubmit=async e=>{

  e.preventDefault();
  if (email && password) {
    login(email,password)
  
  }
        else{
          setAlert('Please fill all the fileds','warning');
        }
      }

     

  const classes = useStyles();


  if(isAuthenticated){

//if(user.role === 'User')
//return <Redirect to="/index"/>
//else if(
//user.role ==='Admin'
//)
    return <Redirect to="/business"/>
  }

  return (
    <Grid container component="main" className={classes.root}>
     
      <Grid item xs={false} sm={4} md={7} className={classes.image} />

      <Grid item xs={12} sm={8} md={5} component={Paper} square>
        <div className={classes.paper}>

          <Avatar className={classes.avatar}>
            <LockOutlinedIcon />
          </Avatar>

          <Typography component="h1" variant="h5">
            Sign in
          </Typography>

          <form onSubmit = { e=>onSubmit(e)} className={classes.form} noValidate>
            <TextField
            onChange={e=>onChange(e)}
              variant="outlined"
              margin="normal"
              required
              fullWidth
              id="email"
              label="Email Address"
              name="email"
              value={email}
            />

            <TextField
            onChange={e=>onChange(e)}
              variant="outlined"
              margin="normal"
              required
              fullWidth
              name="password"
              label="Password"
              type="password"
              id="password"
              value={password}
            />

            <FormControlLabel
              control={<Checkbox value="remember" color="primary" />}
              label="Remember me"
            />

            <Button
              type="submit"
              fullWidth
              variant="contained"
              color="Primary"
              className={classes.submit}
            >
              Sign In
            </Button>

            <Grid container>
              <Grid item xs>
                <Link href="forgotpassword" variant="body2">
                  Forgot password?
                </Link>
              </Grid>
              <Grid item>

                <Link href="signup" variant="body2">
                  {"Not a member? Sign Up"}
                </Link>
              </Grid>
            </Grid>
            
            <Box mt={5}>
              <Copyright />
            </Box>

          </form>
        </div>
      </Grid>
    </Grid>
  );
}

SignIn.propTypes={
  login:PropTypes.func.isRequired,
  setAlert:PropTypes.func.isRequired,
  isAuthenticated:PropTypes.bool,
  user: PropTypes.object.isRequired,
};

const mapStateToProps=state=>({
  isAuthenticated:state.auth.isAuthenticated,
  user: state.auth.user,
})


export default connect(mapStateToProps,{login,setAlert})(SignIn);

Answer 1

I think in initial state of redux you need to check whether or not localStorage.token is not null/expired and set it back to user. So that whenever you refresh the page user da still can load

Answer 2

I was able to resolve above issue by using jwt_decode

  if (localStorage.token) {
    setAuthToken(localStorage.token);
    var decoded = jwt_decode(localStorage.token);
   
}

  try {
   const res = await axios.get(`https://localhost:5001/api/auth/user/${decoded.Id}`);
    dispatch({
     type: USER_LOADED,
     payload: res.data,
    });
 } catch (err) {
    dispatch({
      type: AUTH_ERROR,
  });
}
};