[Feature] #1 세션 기반 인증 API 구현

.gitignore

@@ -15,4 +15,5 @@ venv/
 
 # IDE
 .vscode/
-.idea/
+.idea/cookies.txt
+cookies.txt

accounts/urls.py

@@ -0,0 +1,14 @@
+# accounts/urls.py
+from django.urls import path
+from . import views 
+
+urlpatterns = [
+    path("signup/", views.signup, name="signup"),
+
+    path("login/", views.login, name="login"),
+
+    path("logout/", views.logout, name="logout"),
+
+    path("session/", views.session, name="session"),  # GET /auth/session
+
+]

accounts/views.py

@@ -1,3 +1,98 @@
-from django.shortcuts import render
+# accounts/views.py
+from rest_framework.decorators import api_view, permission_classes
+from rest_framework.permissions import AllowAny, IsAuthenticated
+from rest_framework.response import Response
+from rest_framework import status
+from django.contrib.auth import authenticate, login as auth_login, logout as auth_logout
+from django.contrib.auth.models import User
+from django.views.decorators.csrf import ensure_csrf_cookie
+from django.utils.decorators import method_decorator
 
 # Create your views here.
+
+def _has_profile(user) -> bool:
+    # TODO: 프로필 모델 확정 후 구현
+    return False
+
+# 회원가입
+@api_view(["POST"])
+@permission_classes([AllowAny])   # 공개 엔드포인트
+def signup(request):
+    username = request.data.get("username")
+    password = request.data.get("password")
+
+    # TODO: 검증 — 필수값 누락, username 중복, 비밀번호 정책 등
+
+    user = User.objects.create_user(username=username, password=password)
+    auth_login(request, user)  # 가입직후 세션 생성
+
+    return Response(
+        {"user_id": user.id, "username": user.username,
+         "has_profile": False, "next": "/signup/profile"},
+        status=status.HTTP_201_CREATED,
+    )
+
+# 로그인
+@api_view(["POST"])
+@permission_classes([AllowAny])   # 공개 엔드포인트
+def login(request):
+    username = request.data.get("username")
+    password = request.data.get("password")
+
+    # 400: 필수값 누락
+    if not username or not password:
+        return Response(
+            {"code": "INVALID_INPUT",
+             "message": "아이디와 비밀번호를 모두 입력해주세요."
+             },
+            status=status.HTTP_400_BAD_REQUEST,
+        )
+
+    user = authenticate(request, username=username, password=password)
+
+    if user is None:    # 401: 인증 실패
+        return Response(
+            {"code": "INVALID_CREDENTIALS",
+            "message": "아이디 또는 비밀번호가 일치하지 않습니다."
+            },
+            status=status.HTTP_401_UNAUTHORIZED,
+        )
+
+    auth_login(request, user)  # 로그인 성공 시 세션 생성
+    has_profile = _has_profile(user)  # 프로필 존재 여부 확인
+    return Response(
+        {"user_id": user.id, "username": user.username,
+         "has_profile": has_profile, "next": "/" if has_profile else "/signup/profile"},
+         status=status.HTTP_200_OK,
+    )
+
+# 로그아웃
+@api_view(["POST"])
+@permission_classes([IsAuthenticated])  
+def logout(request):
+    auth_logout(request)  # 세션 삭제
+    return Response(
+        {"success": True, "night_session_active": True, "next": "/login"}, 
+        status=status.HTTP_200_OK
+    )
+
+# 세션 확인
+@api_view(["GET"])
+@permission_classes([AllowAny])   
+@ensure_csrf_cookie
+def session(request):
+    # 미인증
+    if not request.user.is_authenticated:
+        return Response(
+            {"is_authenticated": False, "user_id": None, 
+             "has_profile": False, "next": "/login"},
+            status=status.HTTP_200_OK,
+        )
+
+    # 인증됨
+    has_profile = _has_profile(request.user)   # TODO: 프로필 이슈에서 구현
+    return Response(
+        {"is_authenticated": True, "user_id": request.user.id,
+         "has_profile": has_profile, "next": "/" if has_profile else "/signup/profile"},
+        status=status.HTTP_200_OK,
+    )

config/exception_handlers.py

@@ -0,0 +1,24 @@
+# config/exception_handlers.py
+from rest_framework.views import exception_handler
+from rest_framework.exceptions import NotAuthenticated, AuthenticationFailed, PermissionDenied
+from rest_framework import status
+
+
+def custom_exception_handler(exc, context):
+    response = exception_handler(exc, context)
+
+    if response is None:
+        return response
+
+    # 미인증: DRF 기본 403 -> 401로 변환 
+    if isinstance(exc, (NotAuthenticated, AuthenticationFailed)):
+        response.status_code = status.HTTP_401_UNAUTHORIZED
+        response.data = {"code": "NOT_AUTHENTICATED",
+                         "message": "로그인 상태가 아닙니다."}
+
+    # CSRF 실패: 403
+    elif isinstance(exc, PermissionDenied):
+        response.data = {"code": "CSRF_FAILED",
+                         "message": "요청이 유효하지 않습니다. 새로고침 후 다시 시도해주세요."}
+
+    return response

config/settings.py

@@ -37,8 +37,18 @@
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+
+    'rest_framework',
+    'accounts',
 ]
 
+REST_FRAMEWORK = {
+    "DEFAULT_AUTHENTICATION_CLASSES": [
+        "rest_framework.authentication.SessionAuthentication",
+    ],
+    "EXCEPTION_HANDLER": "config.exception_handlers.custom_exception_handler",
+}
+
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',

config/urls.py

@@ -15,8 +15,9 @@
     2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
 """
 from django.contrib import admin
-from django.urls import path
+from django.urls import path, include
 
 urlpatterns = [
     path('admin/', admin.site.urls),
-]
+    path('auth/', include('accounts.urls')),
+]

requirements.txt

@@ -1,5 +1,4 @@
 asgiref==3.12.1
-Django==6.0.7
-djangorestframework==3.17.1
+Django==6.0.8
+djangorestframework==3.17.2
 sqlparse==0.5.5
-tzdata==2026.3