From ef9d32cda5fb6504c97ac6f33600b3e42363ac0d Mon Sep 17 00:00:00 2001
From: PANDACUSHION <sapkotamanish178@gmail.com>
Date: Sat, 11 Jan 2025 16:10:44 +0545
Subject: [PATCH] password validation and exception

---
 backend/utils/utils.py | 52 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/backend/utils/utils.py b/backend/utils/utils.py
index 2098c68..eeac0c5 100644
--- a/backend/utils/utils.py
+++ b/backend/utils/utils.py
@@ -30,4 +30,54 @@ def is_valid_email(email):
     if re.match(pattern, email):
         return True
     else:
-        return False
\ No newline at end of file
+        return False
+    
+def password_check(passwd: str) -> bool:
+    special_symbol_pattern = r'[$@#%]'
+    upper_case_pattern = r'[A-Z]'
+    lower_case_pattern = r'[a-z]'
+    digit_pattern = r'[0-9]'
+    
+    if len(passwd) < 6:
+        raise PasswordLengthMinException('Password length should be at least 6 characters.')
+    elif len(passwd) > 20:
+        raise PasswordLengthMaxException('Password length should not be greater than 20 characters.')
+
+    if not re.search(digit_pattern, passwd):
+        raise PasswordNumericException('Password should have at least one numeral.')
+
+    if not re.search(upper_case_pattern, passwd):
+        raise PasswordUppercaseException('Password should have at least one uppercase letter.')
+
+    if not re.search(lower_case_pattern, passwd):
+        raise PasswordLowercaseException('Password should have at least one lowercase letter.')
+
+    if not re.search(special_symbol_pattern, passwd):
+        raise PasswordSpecialSymbolException('Password should have at least one of the symbols $@#%.')
+
+    return True
+
+
+class PasswordLengthMinException(Exception):
+    def __init__(self, message):
+        self.message = message
+
+class PasswordLengthMaxException(Exception):
+    def __init__(self, message):
+        self.message = message
+
+class PasswordNumericException(Exception):
+    def __init__(self, message):
+        self.message = message
+
+class PasswordUppercaseException(Exception):
+    def __init__(self, message):
+        self.message = message
+
+class PasswordLowercaseException(Exception):
+    def __init__(self, message):
+        self.message = message
+
+class PasswordSpecialSymbolException(Exception):
+    def __init__(self, message):
+        self.message = message