From 4a7b0b2daf091274b645086cc721a3a101985907 Mon Sep 17 00:00:00 2001
From: Florian THIERRY <florian_thierry@ext.connect-tech.sncf>
Date: Fri, 1 Dec 2023 10:00:07 +0100
Subject: [PATCH] Add method to retrieve authenticated user.

---
 .../security/AuthenticationFacade.java           | 13 +++++++++++++
 .../sportshub/application/user/UserUseCases.java | 16 +++++++++++++++-
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 sportshub-application/src/main/java/org/sportshub/application/security/AuthenticationFacade.java

diff --git a/sportshub-application/src/main/java/org/sportshub/application/security/AuthenticationFacade.java b/sportshub-application/src/main/java/org/sportshub/application/security/AuthenticationFacade.java
new file mode 100644
index 0000000..b6a8833
--- /dev/null
+++ b/sportshub-application/src/main/java/org/sportshub/application/security/AuthenticationFacade.java
@@ -0,0 +1,13 @@
+package org.sportshub.application.security;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+
+// This class allow to retrieve connected user information through "Authentication" object.
+@Component
+public class AuthenticationFacade {
+    public Authentication getAuthentication() {
+        return SecurityContextHolder.getContext().getAuthentication();
+    }
+}
diff --git a/sportshub-application/src/main/java/org/sportshub/application/user/UserUseCases.java b/sportshub-application/src/main/java/org/sportshub/application/user/UserUseCases.java
index f981850..1cc41ac 100644
--- a/sportshub-application/src/main/java/org/sportshub/application/user/UserUseCases.java
+++ b/sportshub-application/src/main/java/org/sportshub/application/user/UserUseCases.java
@@ -4,11 +4,13 @@ import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
+import org.sportshub.application.security.AuthenticationFacade;
 import org.sportshub.application.security.JwtService;
 import org.sportshub.application.security.annotation.AllowedToAdmins;
 import org.sportshub.domain.exception.LoginFailureException;
 import org.sportshub.domain.user.model.User;
 import org.sportshub.domain.user.port.UserPort;
+import org.springframework.security.core.Authentication;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 
@@ -17,15 +19,18 @@ public class UserUseCases {
     private final PasswordEncoder passwordEncoder;
     private final JwtService jwtService;
     private final UserPort userPort;
+    private final AuthenticationFacade authenticationFacade;
 
     public UserUseCases(
-        PasswordEncoder passwordEncoder,
+        AuthenticationFacade authenticationFacade,
         JwtService jwtService,
+        PasswordEncoder passwordEncoder,
         UserPort userPort
     ) {
         this.passwordEncoder = passwordEncoder;
         this.jwtService = jwtService;
         this.userPort = userPort;
+        this.authenticationFacade = authenticationFacade;
     }
 
     public Optional<User> findById(UUID userId) {
@@ -43,4 +48,13 @@ public class UserUseCases {
             .map(jwtService::createJwt)
             .orElseThrow(LoginFailureException::new);
     }
+
+    public Optional<User> getAuthenticatedUser() {
+        return Optional.of(authenticationFacade.getAuthentication())
+            .map(Authentication::getPrincipal)
+            .filter(String.class::isInstance)
+            .map(String.class::cast)
+            .map(UUID::fromString)
+            .flatMap(userPort::findById);
+    }
 }