Enhance input sanitization and normalize pronouns

Updated the sanitizer function to improve input sanitization by removing style tags, normalizing pronouns, and increasing the maximum length limit.

Author: AkhilRB0204

server/api/views/assistant/sanitizer.py

@@ -1,26 +1,76 @@
 import re
 import logging
+
 logger = logging.getLogger(__name__)
 def sanitize_input(user_input:str) -> str:
     """
     Sanitize user input to prevent injection attacks and remove unwanted characters.
+    
     Args:
         user_input (str): The raw input string from the user.
+        
     Returns:
         str: The sanitized input string.
     """
     try:
-        # Remove any script tags
-        sanitized = re.sub(r'<script.*?>.*?</script>', '', user_input, flags=re.IGNORECASE)
-        # Remove any HTML tags
+        sanitized = user_input
+        
+        # Remove any style tags
+        sanitized = re.sub(r'<style.*?>.*?</style>', '', sanitized, flags=re.IGNORECASE)
+
+        # Remove any HTML/script tags
         sanitized = re.sub(r'<.*?>', '', sanitized)
+
+        # Remove Phone Numbers
+        sanitized = re.sub(r'\+?\d[\d -]{8,}\d', '[Phone Number]', sanitized)
+
+        # Remove Email Addresses
+        sanitized = re.sub(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', '[Email Address]', sanitized)
+
+        # Remove Medical Record Numbers (simple pattern)
+        sanitized = re.sub(r'\bMRN[:\s]*\d+\b', '[Medical Record Number]', sanitized, flags=re.IGNORECASE)
+
+        # Normalize pronouns
+        sanitized = normalize_pronouns(sanitized)
+
         # Escape special characters
-        sanitized = re.sub(r'["\'\\]', '', sanitized)
+        sanitized = re.sub(r'\s+', '', sanitized)
+
         # Limit length to prevent buffer overflow attacks
-        max_length = 1000
+        max_length = 5000
         if len(sanitized) > max_length:
             sanitized = sanitized[:max_length]
+        
         return sanitized.strip()
     except Exception as e:
         logger.error(f"Error sanitizing input: {e}")
-        return ""
+        return ""
+    
+def normalize_pronouns(text:str) -> str:
+    """
+    Normalize first and second person pronouns to third person clinical language.
+
+    Converts patient centric pronouns to a more neutral form.
+    Args:
+        text (str): The input text containing pronouns.
+    Returns:
+        str: The text with normalized pronouns.
+    """
+    # Normalize first person possessives: I, me, my, mine -> the patient
+    text = re.sub(r'\bMy\b', 'The patient\'s', text)
+    text = re.sub(r'\bmy\b', 'the patient\'s', text)
+
+    # First person subject: I -> the patient
+    text = re.sub(r'\bI\b', 'the patient', text)
+
+    # First person object: me -> the patient
+    text = re.sub(r'\bme\b', 'the patient', text)
+
+    # First person reflexive: myself -> the patient
+    text = re.sub(r'\bmyself\b', 'the patient', text)
+
+    # Second person: you, your -> the clinician
+    text = re.sub(r'\bYour\b', 'the clinician', text)
+    return text
+
+