feat: add cant follow yourself error

itd/exceptions.py

@@ -7,14 +7,20 @@ class NoAuthData(Exception):
         return 'No auth data. Provide token or cookies'
 
 class InvalidCookie(Exception):
+    def __init__(self, code: str):
+        self.code = code
     def __str__(self):
-        return f'Invalid cookie data'
+        if self.code == 'SESSION_NOT_FOUND':
+            return f'Invalid cookie data: Session not found (incorrect refresh token)'
+        elif self.code == 'REFRESH_TOKEN_MISSING':
+            return f'Invalid cookie data: No refresh token'
+        # SESSION_REVOKED
+        return f'Invalid cookie data: Session revoked (logged out)'
 
 class InvalidToken(Exception):
     def __str__(self):
         return f'Invalid access token'
 
-
 class SamePassword(Exception):
     def __str__(self):
         return 'Old and new password must not equals'
@@ -58,4 +64,12 @@ class Forbidden(Exception):
 
 class UsernameTaken(Exception):
     def __str__(self):
-        return 'Username is already taken'
+        return 'Username is already taken'
+
+class CantFollowYourself(Exception):
+    def __str__(self):
+        return 'Cannot follow yourself'
+
+class Unauthorized(Exception):
+    def __str__(self) -> str:
+        return 'Auth required - refresh token'