✨ Feat: [#72] 깃허브 관련 기능 구현 완료

users/services.py

@@ -1,3 +1,5 @@
+import requests
+
 from .models import *
 from projects.models import *
 from portfolios.models import *
@@ -5,6 +7,8 @@ from portfolios.models import *
 from django.utils import timezone
 from datetime import timedelta
 
+from django.conf import settings
+
 
 DUPLICATE_CHECK = {
     'email': 'email',
@@ -12,6 +16,8 @@ DUPLICATE_CHECK = {
     'phone': 'phone'
 }
 
+GITHUB_TOKEN_URL = "https://github.com/login/oauth/access_token"
+
 class CheckUserFieldDuplicateService:
     @staticmethod
     def check_duplicate(field: str, value: str) -> bool:
@@ -92,3 +98,35 @@ class UserToProjectService:
     @staticmethod
     def get_scrap_project(user: User):
         return user.scrapped_projects.filter(is_published=True)
+
+
+class GithubTokenService:
+    @staticmethod
+    def exchange_code_to_access_token(code: str) -> dict:
+        try:
+            resp = requests.post(
+                GITHUB_TOKEN_URL,
+                headers={"Accept": "application/json"},
+                data = {
+                    "client_id": settings.GITHUB_CLIENT_ID,
+                    "client_secret": settings.GITHUB_CLIENT_SECRET,
+                    "code": code,
+                },
+                timeout=10,
+                )
+            resp.raise_for_status()
+            return resp.json()
+        except requests.HTTPError as e:
+            raise Exception(
+                f"Github token exchange failed: {e.response.status_code} - {e.response.text}"
+            )
+        
+    def github_token_save(data: dict, user: User):
+        return GithubToken.objects.update_or_create(
+            user=user,
+            defaults={
+                "access_token":  data["access_token"],
+                "scope":         data.get("scope", ""),
+                "token_type":    data.get("token_type", "bearer"),
+            },
+        )