Sicherer Spring Boot RESTful Service mit Auth0 JWT

package org.o7planning.sbjwt;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootJwtApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootJwtApplication.class, args);
    }
    
}

package org.o7planning.sbjwt.model;

public class Employee {

    private String empNo;
    private String empName;
    private String position;

    public Employee() {

    }

    public Employee(String empNo, String empName, String position) {
        this.empNo = empNo;
        this.empName = empName;
        this.position = position;
    }

    public String getEmpNo() {
        return empNo;
    }

    public void setEmpNo(String empNo) {
        this.empNo = empNo;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }

    public String getPosition() {
        return position;
    }

    public void setPosition(String position) {
        this.position = position;
    }

}

package org.o7planning.sbjwt.dao;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.o7planning.sbjwt.model.Employee;
import org.springframework.stereotype.Repository;

@Repository
public class EmployeeDAO {

    private static final Map<String, Employee> empMap = new HashMap<String, Employee>();

    static {
        initEmps();
    }

    private static void initEmps() {
        Employee emp1 = new Employee("E01", "Smith", "Clerk");
        Employee emp2 = new Employee("E02", "Allen", "Salesman");
        Employee emp3 = new Employee("E03", "Jones", "Manager");

        empMap.put(emp1.getEmpNo(), emp1);
        empMap.put(emp2.getEmpNo(), emp2);
        empMap.put(emp3.getEmpNo(), emp3);
    }

    public Employee getEmployee(String empNo) {
        return empMap.get(empNo);
    }

    public Employee addEmployee(Employee emp) {
        empMap.put(emp.getEmpNo(), emp);
        return emp;
    }

    public Employee updateEmployee(Employee emp) {
        empMap.put(emp.getEmpNo(), emp);
        return emp;
    }

    public void deleteEmployee(String empNo) {
        empMap.remove(empNo);
    }

    public List<Employee> getAllEmployees() {
        Collection<Employee> c = empMap.values();
        List<Employee> list = new ArrayList<Employee>();
        list.addAll(c);
        return list;
    }

}

package org.o7planning.sbjwt.controller;

import java.util.List;

import org.o7planning.sbjwt.dao.EmployeeDAO;
import org.o7planning.sbjwt.model.Employee;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class MainRESTController {

    @Autowired
    private EmployeeDAO employeeDAO;

    @RequestMapping("/")
    @ResponseBody
    public String welcome() {
        return "Welcome to Spring Boot + REST + JWT Example.";
    }

    @RequestMapping("/test")
    @ResponseBody
    public String test() {
        return "{greeting: 'Hello'}";
    }

    // URL:
    // http://localhost:8080/employees
    @RequestMapping(value = "/employees", //
            method = RequestMethod.GET, //
            produces = { MediaType.APPLICATION_JSON_VALUE, //
                    MediaType.APPLICATION_XML_VALUE })
    @ResponseBody
    public List<Employee> getEmployees() {
        List<Employee> list = employeeDAO.getAllEmployees();
        return list;
    }

    // URL:
    // http://localhost:8080/employee/{empNo}
    @RequestMapping(value = "/employee/{empNo}", //
            method = RequestMethod.GET, //
            produces = { MediaType.APPLICATION_JSON_VALUE, //
                    MediaType.APPLICATION_XML_VALUE })
    @ResponseBody
    public Employee getEmployee(@PathVariable("empNo") String empNo) {
        return employeeDAO.getEmployee(empNo);
    }

    // URL:
    // http://localhost:8080/employee

    @RequestMapping(value = "/employee", //
            method = RequestMethod.POST, //
            produces = { MediaType.APPLICATION_JSON_VALUE, //
                    MediaType.APPLICATION_XML_VALUE })
    @ResponseBody
    public Employee addEmployee(@RequestBody Employee emp) {

        System.out.println("(Service Side) Creating employee: " + emp.getEmpNo());

        return employeeDAO.addEmployee(emp);
    }

    // URL:
    // http://localhost:8080/employee
    @RequestMapping(value = "/employee", //
            method = RequestMethod.PUT, //
            produces = { MediaType.APPLICATION_JSON_VALUE, //
                    MediaType.APPLICATION_XML_VALUE })
    @ResponseBody
    public Employee updateEmployee(@RequestBody Employee emp) {

        System.out.println("(Service Side) Editing employee: " + emp.getEmpNo());

        return employeeDAO.updateEmployee(emp);
    }

    // URL:
    // http://localhost:8080/employee/{empNo}
    @RequestMapping(value = "/employee/{empNo}", //
            method = RequestMethod.DELETE, //
            produces = { MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE })
    @ResponseBody
    public void deleteEmployee(@PathVariable("empNo") String empNo) {

        System.out.println("(Service Side) Deleting employee: " + empNo);

        employeeDAO.deleteEmployee(empNo);
    }

}

package org.o7planning.sbjwt.config;

import org.o7planning.sbjwt.filter.JWTAuthenticationFilter;
import org.o7planning.sbjwt.filter.JWTLoginFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.authentication.configurers.provisioning.InMemoryUserDetailsManagerConfigurer;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable().authorizeRequests()
                // No need authentication.
                .antMatchers("/").permitAll() //
                .antMatchers(HttpMethod.POST, "/login").permitAll() //
                .antMatchers(HttpMethod.GET, "/login").permitAll() // For Test on Browser
                // Need authentication.
                .anyRequest().authenticated()
                //
                .and()
                //
                // Add Filter 1 - JWTLoginFilter
                //
                .addFilterBefore(new JWTLoginFilter("/login", authenticationManager()),
                        UsernamePasswordAuthenticationFilter.class)
                //
                // Add Filter 2 - JWTAuthenticationFilter
                //
                .addFilterBefore(new JWTAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class);
    }

    @Bean
    public BCryptPasswordEncoder passwordEncoder() {
        BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder();
        return bCryptPasswordEncoder;
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {

        String password = "123";

        String encrytedPassword = this.passwordEncoder().encode(password);
        System.out.println("Encoded password of 123=" + encrytedPassword);

        InMemoryUserDetailsManagerConfigurer<AuthenticationManagerBuilder> //
        mngConfig = auth.inMemoryAuthentication();

        // Defines 2 users, stored in memory.
        // ** Spring BOOT >= 2.x (Spring Security 5.x)
        // Spring auto add ROLE_
        UserDetails u1 = User.withUsername("tom").password(encrytedPassword).roles("USER").build();
        UserDetails u2 = User.withUsername("jerry").password(encrytedPassword).roles("USER").build();

        mngConfig.withUser(u1);
        mngConfig.withUser(u2);

        // If Spring BOOT < 2.x (Spring Security 4.x)):
        // Spring auto add ROLE_
        // mngConfig.withUser("tom").password("123").roles("USER");
        // mngConfig.withUser("jerry").password("123").roles("USER");

    }
    
}

package org.o7planning.sbjwt.filter;

import java.io.IOException;
import java.util.Collections;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.o7planning.sbjwt.service.TokenAuthenticationService;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

public class JWTLoginFilter extends AbstractAuthenticationProcessingFilter {

    public JWTLoginFilter(String url, AuthenticationManager authManager) {
        super(new AntPathRequestMatcher(url));
        setAuthenticationManager(authManager);
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
            throws AuthenticationException, IOException, ServletException {

        String username = request.getParameter("username");
        String password = request.getParameter("password");

        System.out.printf("JWTLoginFilter.attemptAuthentication: username/password= %s,%s", username, password);
        System.out.println();

        return getAuthenticationManager()
                .authenticate(new UsernamePasswordAuthenticationToken(username, password, Collections.emptyList()));
    }

    @Override
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain,
            Authentication authResult) throws IOException, ServletException {

        System.out.println("JWTLoginFilter.successfulAuthentication:");

        // Write Authorization to Headers of Response.
        TokenAuthenticationService.addAuthentication(response, authResult.getName());

        String authorizationString = response.getHeader("Authorization");

        System.out.println("Authorization String=" + authorizationString);
    }

}

package org.o7planning.sbjwt.service;

import java.util.Collections;
import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;

import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

public class TokenAuthenticationService {
    
    static final long EXPIRATIONTIME = 864_000_000; // 10 days
    
    static final String SECRET = "ThisIsASecret";
    
    static final String TOKEN_PREFIX = "Bearer";
    
    static final String HEADER_STRING = "Authorization";

    public static void addAuthentication(HttpServletResponse res, String username) {
        String JWT = Jwts.builder().setSubject(username)
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRATIONTIME))
                .signWith(SignatureAlgorithm.HS512, SECRET).compact();
        res.addHeader(HEADER_STRING, TOKEN_PREFIX + " " + JWT);
    }

    public static Authentication getAuthentication(HttpServletRequest request) {
        String token = request.getHeader(HEADER_STRING);
        if (token != null) {
            // parse the token.
            String user = Jwts.parser().setSigningKey(SECRET).parseClaimsJws(token.replace(TOKEN_PREFIX, "")).getBody()
                    .getSubject();

            return user != null ? new UsernamePasswordAuthenticationToken(user, null, Collections.emptyList()) : null;
        }
        return null;
    }
    
}

package org.o7planning.sbjwt.filter;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.o7planning.sbjwt.service.TokenAuthenticationService;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.filter.GenericFilterBean;

public class JWTAuthenticationFilter extends GenericFilterBean {
    
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        
        System.out.println("JWTAuthenticationFilter.doFilter");
        
        Authentication authentication = TokenAuthenticationService
                .getAuthentication((HttpServletRequest) servletRequest);
        
        SecurityContextHolder.getContext().setAuthentication(authentication);
        
        filterChain.doFilter(servletRequest, servletResponse);
    }
    
}

package org.o7planning.sbjwt.restclient;
 
import java.util.Arrays;
import java.util.List;
 
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;
 
public class JWTClientExample {
 
    static final String URL_LOGIN = "http://localhost:8080/login";
    static final String URL_EMPLOYEES = "http://localhost:8080/employees";
 
    // POST Login
    // @return "Authorization string".
    private static String postLogin(String username, String password) {
 
        // Request Header
        HttpHeaders headers = new HttpHeaders();
 
        // Request Body
        MultiValueMap<String, String> parametersMap = new LinkedMultiValueMap<String, String>();
        parametersMap.add("username", username);
        parametersMap.add("password", password);
 
        // Request Entity
        HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(parametersMap, headers);
 
        // RestTemplate
        RestTemplate restTemplate = new RestTemplate();
 
        // POST Login
        ResponseEntity<String> response = restTemplate.exchange(URL_LOGIN, //
                HttpMethod.POST, requestEntity, String.class);
 
        HttpHeaders responseHeaders = response.getHeaders();
 
        List<String> list = responseHeaders.get("Authorization");
        return list == null || list.isEmpty() ? null : list.get(0);
    }
 
    private static void callRESTApi(String restUrl, String authorizationString) {
        // HttpHeaders
        HttpHeaders headers = new HttpHeaders();
 
        //
        // Authorization string (JWT)
        //
        headers.set("Authorization", authorizationString);
        //
        headers.setAccept(Arrays.asList(new MediaType[] { MediaType.APPLICATION_JSON }));
 
        // Request to return JSON format
        headers.setContentType(MediaType.APPLICATION_JSON);
 
        // HttpEntity<String>: To get result as String.
        HttpEntity<String> entity = new HttpEntity<String>(headers);
 
        // RestTemplate
        RestTemplate restTemplate = new RestTemplate();
 
        // Send request with GET method, and Headers.
        ResponseEntity<String> response = restTemplate.exchange(URL_EMPLOYEES, //
                HttpMethod.GET, entity, String.class);
 
        String result = response.getBody();
 
        System.out.println(result);
    }
 
    public static void main(String[] args) {
        String username = "tom";
        String password = "123";
 
        String authorizationString = postLogin(username, password);
 
        System.out.println("Authorization String=" + authorizationString);
 
        // Call REST API:
        callRESTApi(URL_EMPLOYEES, authorizationString);
    }
 
}