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utils.py

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+import math
+from fastapi import HTTPException
+
+def haversine(lat1, lon1, lat2, lon2):
+    R = 6371  # Earth radius in KM
+
+    dLat = math.radians(lat2 - lat1)
+    dLon = math.radians(lon2 - lon1)
+
+    a = (
+        math.sin(dLat / 2) ** 2 +
+        math.cos(math.radians(lat1)) *
+        math.cos(math.radians(lat2)) *
+        math.sin(dLon / 2) ** 2
+    )
+
+    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
+
+    return R * c
+
+
+def calculate_eta(distance):
+    prep_time = 10  # mins
+    travel_time = distance * 5  # mins per km
+
+    eta = prep_time + travel_time
+
+    return f"{int(eta)}-{int(eta + 5)} mins"
+
+# ================= AUTH =================
+from passlib.context import CryptContext
+from jose import jwt
+from datetime import datetime, timedelta
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+SECRET_KEY = "secret123"
+ALGORITHM = "HS256"
+
+
+def hash_password(password: str):
+    password = password[:72]   # 🔥 FIX
+    return pwd_context.hash(password)
+
+
+def verify_password(plain, hashed):
+    plain = plain[:72]
+    return pwd_context.verify(plain, hashed)
+
+
+def create_token(data: dict):
+    to_encode = data.copy()
+    to_encode["exp"] = datetime.utcnow() + timedelta(days=30)
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+# Admin
+from fastapi import Depends
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+
+security = HTTPBearer()
+
+def get_current_admin(
+    credentials: HTTPAuthorizationCredentials = Depends(security)
+):
+    try:
+        payload = jwt.decode(
+            credentials.credentials,
+            SECRET_KEY,
+            algorithms=[ALGORITHM]
+        )
+        return payload
+    except Exception as e:
+        raise HTTPException(
+            status_code=401,
+            detail="Invalid token"
+        )