Spring Boot 3 - Buenas prácticas y protección: Aula 4

010_spring_boot/api_rest/api2/pom.xml

@@ -71,6 +71,12 @@
 			<artifactId>spring-security-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+
+		<dependency>
+			<groupId>com.auth0</groupId>
+			<artifactId>java-jwt</artifactId>
+			<version>4.4.0</version>
+		</dependency>
 	</dependencies>
 
 	<build>

010_spring_boot/api_rest/api2/src/main/java/med/voll/api/controller/AutenticacionController.java

@@ -2,6 +2,9 @@ package med.voll.api.controller;
 
 import jakarta.validation.Valid;
 import med.voll.api.domain.usuario.DatosAutenticacionUsuario;
+import med.voll.api.domain.usuario.Usuario;
+import med.voll.api.infra.security.DatosJWTtoken;
+import med.voll.api.infra.security.TokenService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.authentication.AuthenticationManager;
@@ -19,17 +22,17 @@ public class AutenticacionController {
     @Autowired
     private AuthenticationManager authenticationManager;
 
+    @Autowired
+    private TokenService tokenService;
+
     @PostMapping
     public ResponseEntity autenticarUsuario(@RequestBody @Valid DatosAutenticacionUsuario datosAutenticacionUsuario) {
-        Authentication token = new UsernamePasswordAuthenticationToken(
+        Authentication authtoken = new UsernamePasswordAuthenticationToken(
                 datosAutenticacionUsuario.login(),
                 datosAutenticacionUsuario.clave());
-        authenticationManager.authenticate(token);
-        //var token = new UsernamePasswordAuthenticationToken(
-        //        datosAutenticacionUsuario.login(),
-        //        datosAutenticacionUsuario.clave());
-        //var autentication = authenticationManager.authenticate(token);
-        return ResponseEntity.ok().build();
+        var usuarioAutenticado = authenticationManager.authenticate(authtoken);
+        var JWTtoken = tokenService.generarToken((Usuario) usuarioAutenticado.getPrincipal());
+        return ResponseEntity.ok(new DatosJWTtoken(JWTtoken));
 
     }
 }

010_spring_boot/api_rest/api2/src/main/java/med/voll/api/infra/security/DatosJWTtoken.java

@@ -0,0 +1,4 @@
+package med.voll.api.infra.security;
+
+public record DatosJWTtoken(String jwTtoken) {
+}

010_spring_boot/api_rest/api2/src/main/java/med/voll/api/infra/security/TokenService.java

@@ -0,0 +1,38 @@
+package med.voll.api.infra.security;
+
+import com.auth0.jwt.JWT;
+import com.auth0.jwt.algorithms.Algorithm;
+import com.auth0.jwt.exceptions.JWTCreationException;
+import med.voll.api.domain.usuario.Usuario;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+
+@Service
+public class TokenService {
+
+    @Value("${api.security.secret}")
+    private String apiSecret;
+
+    public String generarToken(Usuario usuario) {
+        try {
+            Algorithm algorithm = Algorithm.HMAC256(apiSecret) ;
+            return JWT.create()
+                    .withIssuer("voll med")
+                    .withSubject(usuario.getLogin())
+                    .withClaim("id", usuario.getId())
+                    .withExpiresAt(generarFechaExpiracion())
+                    .sign(algorithm);
+        } catch (JWTCreationException exception){
+            throw new RuntimeException();
+        }
+
+    }
+
+    private Instant generarFechaExpiracion() {
+        return LocalDateTime.now().plusHours(2).toInstant(ZoneOffset.of("-03:00"));
+    }
+}

010_spring_boot/api_rest/api2/src/main/resources/application.properties

@@ -1,9 +1,11 @@
 # suppress inspection "SpellCheckingInspection" for whole file
-spring.datasource.url=jdbc:mysql://192.168.0.8/vollmed_api2
-spring.datasource.username=alura
-spring.datasource.password=alura
+spring.datasource.url=jdbc:mysql://${DB_URL}/vollmed_api2
+spring.datasource.username=${DB_USER}
+spring.datasource.password=${DB_PASS}
 
 spring.jpa.show-sql=true
 spring.jpa.properties.hibernate.format_sql=true
 
 server.error.include-stacktrace=never
+
+api.security.secret=${JWT_SECRET}

010_spring_boot/spring_boot_2.md

@@ -564,3 +564,107 @@ create table usuarios(
 );
 ```
 
+## JSON Web Token
+
+[JWT](https://jwt.io) - [Repo](https://github.com/auth0/java-jwt)
+
+Agregar dependencia a [pom.xml](./api_rest/api2/pom.xml)
+
+```xml
+<dependency>
+  <groupId>com.auth0</groupId>
+  <artifactId>java-jwt</artifactId>
+  <version>4.4.0</version>
+</dependency>
+```
+
+Creación de clase
+[TokenService](./api_rest/api2/src/main/java/med/voll/api/infra/security/TokenService.java)
+en *package* [infra.security](./api_rest/api2/src/main/java/med/voll/api/infra/security/)
+
+```java
+@Service
+public class TokenService {
+
+    @Value("${api.security.secret}")
+    private String apiSecret;
+
+    public String generarToken(Usuario usuario) {
+        try {
+            Algorithm algorithm = Algorithm.HMAC256(apiSecret) ;
+            return JWT.create()
+                    .withIssuer("voll med")
+                    .withSubject(usuario.getLogin())
+                    .withClaim("id", usuario.getId())
+                    .withExpiresAt(generarFechaExpiracion())
+                    .sign(algorithm);
+        } catch (JWTCreationException exception){
+            throw new RuntimeException();
+        }
+
+    }
+
+    private Instant generarFechaExpiracion() {
+        return LocalDateTime.now()
+                    .plusHours(2)
+                    .toInstant(ZoneOffset.of("-03:00"));
+    }
+}
+```
+
+Creación de propiedades manejadas por variables de entorno/ambiente
+
+[application.properties](./api_rest/api2/src/main/resources/application.properties)
+
+```config
+spring.datasource.url=jdbc:mysql://${DB_URL}/vollmed_api2
+spring.datasource.username=${DB_USER}
+spring.datasource.password=${DB_PASS}
+
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.format_sql=true
+
+server.error.include-stacktrace=never
+
+api.security.secret=${JWT_SECRET}
+```
+
+Creación del DTO
+[DatosTokenJWT](./api_rest/api2/src/main/java/med/voll/api/infra/security/DatosJWTtoken.java)
+en *package*
+[infra.security](./api_rest/api2/src/main/java/med/voll/api/infra/security/)
+
+```java
+public record DatosJWTtoken(String jwTtoken) {}
+```
+
+Modificación en clase
+[AutenticacionController](./api_rest/api2/src/main/java/med/voll/api/controller/AutenticacionController.java)
+en *package* [controller](./api_rest/api2/src/main/java/med/voll/api/controller/)
+
+```java
+@RestController
+@RequestMapping("/login")
+public class AutenticacionController {
+
+    @Autowired
+    private AuthenticationManager authenticationManager;
+
+    @Autowired
+    private TokenService tokenService;
+
+    @PostMapping
+    public ResponseEntity autenticarUsuario(
+      @RequestBody @Valid DatosAutenticacionUsuario datosAutenticacionUsuario) {
+        Authentication authtoken = new UsernamePasswordAuthenticationToken(
+                datosAutenticacionUsuario.login(),
+                datosAutenticacionUsuario.clave());
+        var usuarioAutenticado = authenticationManager.authenticate(authtoken);
+        var JWTtoken = tokenService.generarToken(
+                (Usuario) usuarioAutenticado.getPrincipal()
+        );
+        return ResponseEntity.ok(new DatosJWTtoken(JWTtoken));
+    }
+}
+```
+