Initial Commit

app/exceptions.py

@@ -0,0 +1,58 @@
+from typing import Any
+
+
+class AppError(Exception):
+    def __init__(self, code: str, message: str, status_code: int = 400, details: Any = None):
+        self.code = code
+        self.message = message
+        self.status_code = status_code
+        self.details = details
+        super().__init__(message)
+
+
+class NotFoundError(AppError):
+    def __init__(self, resource: str, details: Any = None):
+        code = f"{resource.upper().replace(' ', '_')}_NOT_FOUND"
+        message = f"{resource.replace('_', ' ').capitalize()} not found"
+        super().__init__(code=code, message=message, status_code=404, details=details)
+
+
+class UnauthorizedError(AppError):
+    def __init__(self, message: str = "Authentication required"):
+        super().__init__(code="UNAUTHORIZED", message=message, status_code=401)
+
+
+class ForbiddenError(AppError):
+    def __init__(self, message: str = "Insufficient permissions"):
+        super().__init__(code="FORBIDDEN", message=message, status_code=403)
+
+
+class ConflictError(AppError):
+    def __init__(self, code: str, message: str, details: Any = None):
+        super().__init__(code=code, message=message, status_code=409, details=details)
+
+
+class PaymentError(AppError):
+    def __init__(self, message: str, details: Any = None):
+        super().__init__(code="PAYMENT_FAILED", message=message, status_code=402, details=details)
+
+
+class ValidationError(AppError):
+    def __init__(self, message: str, details: Any = None):
+        super().__init__(code="VALIDATION_ERROR", message=message, status_code=422, details=details)
+
+
+class OutOfStockError(AppError):
+    def __init__(self, product_name: str = ""):
+        msg = f"'{product_name}' is out of stock" if product_name else "One or more items are out of stock"
+        super().__init__(code="OUT_OF_STOCK", message=msg, status_code=409)
+
+
+class SlotUnavailableError(AppError):
+    def __init__(self):
+        super().__init__(code="SLOT_UNAVAILABLE", message="This time slot is no longer available", status_code=409)
+
+
+class UserBlockedError(AppError):
+    def __init__(self):
+        super().__init__(code="USER_BLOCKED", message="Your account has been suspended", status_code=403)