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Implement User Authentication

Pragya Keshap answered on February 20, 2023 Popularity 7/10 Helpfulness 2/10

answer Implement User Authentication

Implement User Authentication

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public class AuthenticationFilter extends UsernamePasswordAuthenticationFilter {

	private UsersService usersService;
	private Environment environment;
	
	public AuthenticationFilter(UsersService usersService, 
			Environment environment, 
			AuthenticationManager authenticationManager) {
		this.usersService = usersService;
		this.environment = environment;
		super.setAuthenticationManager(authenticationManager);
	}
	
    @Override
    public Authentication attemptAuthentication(HttpServletRequest req,
                                                HttpServletResponse res) throws AuthenticationException {
        try {
  
            LoginRequestModel creds = new ObjectMapper()
                    .readValue(req.getInputStream(), LoginRequestModel.class);
            
            return getAuthenticationManager().authenticate(
                    new UsernamePasswordAuthenticationToken(
                            creds.getEmail(),
                            creds.getPassword(),
                            new ArrayList<>())
            );
            
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    
    @Override
    protected void successfulAuthentication(HttpServletRequest req,
                                            HttpServletResponse res,
                                            FilterChain chain,
                                            Authentication auth) throws IOException, ServletException {
    	String userName = ((User) auth.getPrincipal()).getUsername();
    	UserDto userDetails = usersService.getUserDetailsByEmail(userName);
    	
        String token = Jwts.builder()
                .setSubject(userDetails.getUserId())
                .setExpiration(new Date(System.currentTimeMillis() + Long.parseLong(environment.getProperty("token.expiration_time"))))
                .signWith(SignatureAlgorithm.HS512, environment.getProperty("token.secret") )
                .compact();
        
        res.addHeader("token", token);
        res.addHeader("userId", userDetails.getUserId());
    } 
    
	
}

Popularity 7/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: authentication java

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Contributed on Feb 20 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Implement User Authentication

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