[R9] Create jwt use case class

src/main/java/com/mirna/hospitalmanagementapi/application/usecase/auth/jwt/CreateJWTUseCase.java

@@ -0,0 +1,48 @@
+package com.mirna.hospitalmanagementapi.application.usecase.auth.jwt;
+
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import com.auth0.jwt.JWT;
+import com.auth0.jwt.algorithms.Algorithm;
+import com.mirna.hospitalmanagementapi.domain.entities.auth.User;
+
+/**
+ * This class is used to execute the JWT create method using Algorithm HMAC256 along with the authenticated user login and id
+ * 
+ * @author Mirna Gama
+ * @version 1.0
+ */
+@Component
+public class CreateJWTUseCase {
+
+	@Value("${api.security.token.secret}")
+    private String secret;
+	
+	/**
+	 * 
+	 * @param user The authenticated user
+	 * @return A string containing the json web token signed with Algorithm HMAC256
+	 */
+	public String execute(User user) {
+		Algorithm algorithm = Algorithm.HMAC256(secret);
+		
+		return JWT.create().withIssuer("Hospital-Management-API")
+				.withSubject(user.getLogin())
+				.withClaim("id", user.getId())
+				.withExpiresAt(_getExpirationDate())
+				.sign(algorithm);
+	}
+	
+	/**
+	 * Gets an expiration date for the token based on 2 hours duration
+	 * @return Instant object containing the expiration date
+	 */
+	private Instant _getExpirationDate() {
+		return LocalDateTime.now().plusHours(2).toInstant(ZoneOffset.of("-03:00"));
+	}
+}