feat: implement LeetCode session authentication.

Author: arnav-on-code

config.py

@@ -6,8 +6,8 @@
 
 class Config:
 
-    Leetcode_session = os.getenv("LEETCODE_SESSION", "")
-    CSRF_token = os.getenv("CSRF_TOKEN", "")
+    LEETCODE_SESSION = os.getenv("LEETCODE_SESSION", "")
+    CSRF_TOKEN = os.getenv("CSRF_TOKEN", "")
 
     GITHUB_USERNAME = os.getenv("GITHUB_USERNAME", "")
     GITHUB_EMAIL = os.getenv("GITHUB_EMAIL", "")

leetcode/api.py

@@ -0,0 +1,11 @@
+from requests import Session
+
+
+class LeetCodeAPI:
+    def __init__(self, session: Session):
+        self.session = session
+
+    def validate_session(self) -> bool:
+        response = self.session.get("https://leetcode.com/api/problems/all/")
+
+        return response.status_code == 200

leetcode/auth.py

@@ -0,0 +1,29 @@
+from requests import Session
+
+from config import Config
+
+
+class LeetCodeAuth:
+
+    def __init__(self):
+        self.session = Session()
+
+        self.session.headers.update(
+            {
+                "User-Agent": Config.USER_AGENT,
+                "Referer": "https://leetcode.com/",
+                "Origin": "https://leetcode.com",
+                "Content-Type": "application/json",
+            }
+        )
+
+        self.session.cookies.update(
+            {
+                "LEETCODE_SESSION": Config.LEETCODE_SESSION,
+                "csrftoken": Config.CSRF_TOKEN,
+            }
+        )
+
+    def get_session(self) -> Session:
+        """Return the configured session."""
+        return self.session

main.py

@@ -1,20 +1,32 @@
 from rich.console import Console
 from rich.panel import Panel
 
+from leetcode.auth import LeetCodeAuth
+from leetcode.api import LeetCodeAPI
+
 console = Console()
+
+
 def banner():
     console.print(
         Panel.fit(
             "[bold cyan]LeetCode Sync[/bold cyan]\n"
             "Automatic LeetCode → GitHub Synchronization",
-            title="v0.1.0",
+            title="v0.2.0",
         )
     )
+
+
 def main():
     banner()
 
-    console.print("[green]Project initialized successfully.[/green]")
-    console.print("Next milestone: Authenticate with LeetCode.")
+    auth = LeetCodeAuth()
+    api = LeetCodeAPI(auth.get_session())
+
+    if api.validate_session():
+        console.print("[green]✓ Session is valid[/green]")
+    else:
+        console.print("[red]✗ Invalid session[/red]")
 
 
 if __name__ == "__main__":