Convert login by id into login by email.

codiki-domain/src/main/java/org/codiki/domain/user/model/User.java

@@ -1,6 +1,10 @@
 package org.codiki.domain.user.model;
 
+import static java.util.Objects.isNull;
+import static java.util.stream.Collectors.joining;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.UUID;
 
 public record User(
@@ -10,4 +14,21 @@ public record User(
     String password,
     UUID photoId,
     List<UserRole> roles
-) {}
+) {
+    public Map<String, Object> toJwtPayload() {
+        Map<String, Object> result = new HashMap<>(4);
+
+        result.put("pseudo", pseudo);
+        result.put("email", email);
+        if (!isNull(photoId)) {
+            result.put("photoId", photoId.toString());
+        }
+
+        String rolesAsString = roles.stream()
+            .map(UserRole::name)
+            .collect(joining(","));
+        result.put("roles", rolesAsString);
+
+        return result;
+    }
+}

codiki-domain/src/main/java/org/codiki/domain/user/model/UserRole.java

@@ -1,6 +1,15 @@
 package org.codiki.domain.user.model;
 
+import java.util.Optional;
+import java.util.stream.Stream;
+
 public enum UserRole {
     STANDARD,
-    ADMIN
+    ADMIN;
+
+    public static Optional<UserRole> from(String roleAsString) {
+        return Stream.of(UserRole.values())
+            .filter(role -> role.name().equals(roleAsString))
+            .findFirst();
+    }
 }

codiki-domain/src/main/java/org/codiki/domain/user/model/builder/UserBuilder.java

@@ -1,11 +1,13 @@
 package org.codiki.domain.user.model.builder;
 
+import static java.util.Objects.isNull;
 import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Set;
 import java.util.UUID;
 
+import org.codiki.domain.user.exception.UserCreationException;
 import org.codiki.domain.user.model.User;
 import org.codiki.domain.user.model.UserRole;
 
@@ -59,6 +61,14 @@ public class UserBuilder {
     }
 
     public User build() {
-        return new User(id, pseudo,email, password, photoId, new LinkedList<>(roles));
+        if (isNull(id) || isNull(pseudo) || isNull(email) || isNull(password) || isEmpty(roles)) {
+            throw new UserCreationException();
+        }
+
+        return new User(id, pseudo, email, password, photoId, new LinkedList<>(roles));
+    }
+
+    private static boolean isEmpty(Set<UserRole> roles) {
+        return isNull(roles) || roles.isEmpty();
     }
 }

codiki-domain/src/main/java/org/codiki/domain/user/port/UserPort.java

@@ -10,6 +10,8 @@ import org.codiki.domain.user.model.User;
 public interface UserPort {
     Optional<User> findById(UUID userId);
 
+    Optional<User> findByEmail(String userEmail);
+
     List<User> findAll();
 
     void save(User user);