implemented is_authenticated middleware

Co-authored-by: Trisha Reddy <105570654+trishavreddy@users.noreply.github.com>
Co-authored-by: Chloe <138538887+ChL4859@users.noreply.github.com>

server/utils.py

@@ -0,0 +1,27 @@
+from flask import request, jsonify
+
+import functools
+
+from models.session import Session
+
+
+def is_authenticated(f):
+    def not_authenticated():
+        res = {"status": "Not authenticated."}
+        return jsonify(res), 401
+
+    @functools.wraps(f)
+    def wrapper(*args, **kwargs):
+        token = request.cookies.get("session")
+
+        from app import app, db
+
+        with app.app_context():
+            session = db.session.query(Session).filter_by(token=token).first()
+
+            if session is None:
+                return not_authenticated()
+
+        return f(*args, **kwargs)
+
+    return wrapper