To_DO: ERROR AFTER LOGGING IN

utils/validation.py

@@ -0,0 +1,56 @@
+import re
+import logging
+
+logger = logging.getLogger(__name__)
+
+class ValidationUtils:
+    @staticmethod
+    def validate_email(email: str) -> bool:
+        if not email or not isinstance(email, str):
+            return False
+
+        email = email.strip().lower()
+        pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
+        is_valid = bool(re.match(pattern, email))
+
+        if not is_valid:
+            logger.warning(f"Invalid email format: {email}")
+
+        return is_valid
+
+    @staticmethod
+    def validate_username(username: str) -> bool:
+        if not username or not isinstance(username, str):
+            return False
+        username = username.strip()
+        # Username-Regeln: 3-25 Zeichen, nur Buchstaben, Zahlen und Unterstrich
+        if len(username) < 3 or len(username) > 25:
+            logger.warning(f"Username length invalid: {len(username)}")
+            return False
+        pattern = r'^[a-zA-Z0-9_]+$'
+        is_valid = bool(re.match(pattern, username))
+        if not is_valid:
+            logger.warning(f"Invalid username format: {username}")
+        return is_valid
+
+    @staticmethod
+    def validate_password(password: str) -> tuple[bool, list[str]]:
+        errors = []
+        if not password or not isinstance(password, str):
+            errors.append("Password is required")
+            return False, errors
+        if len(password) < 4 or len(password) > 50:
+            errors.append("Password must be at least 4 characters long and must not exceed 128 characters")
+        if not re.search(r'[A-Z]', password):
+            errors.append("Password must contain at least one uppercase letter")
+        if not re.search(r'[a-z]', password):
+            errors.append("Password must contain at least one lowercase letter")
+        if not re.search(r'\d', password):
+            errors.append("Password must contain at least one digit")
+        if not re.search(r'[!@#$%^&*(),.?":{}|<>]', password):
+            errors.append("Password must contain at least one special character")
+        is_valid = len(errors) == 0
+        if not is_valid:
+            logger.warning(f"Password validation failed: {errors}")
+
+        return is_valid, errors