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66b5d30 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | """
Input validation utilities.
"""
import re
from typing import Tuple, Optional
from config import Config
class Validators:
"""Input validation utilities."""
# Email regex pattern
EMAIL_PATTERN = re.compile(
r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
)
# Password requirements
PASSWORD_MIN_LENGTH = 8
PASSWORD_MAX_LENGTH = 128
@staticmethod
def validate_email(email: str) -> Tuple[bool, Optional[str]]:
"""
Validate email format.
Args:
email: Email to validate
Returns:
Tuple of (is_valid, error_message)
"""
if not email:
return False, "Email is required"
email = email.strip().lower()
if len(email) > 254:
return False, "Email is too long"
if not Validators.EMAIL_PATTERN.match(email):
return False, "Invalid email format"
return True, None
@staticmethod
def validate_password(password: str) -> Tuple[bool, Optional[str]]:
"""
Validate password strength.
Requirements:
- At least 8 characters
- At least one uppercase letter
- At least one lowercase letter
- At least one number
Args:
password: Password to validate
Returns:
Tuple of (is_valid, error_message)
"""
if not password:
return False, "Password is required"
if len(password) < Validators.PASSWORD_MIN_LENGTH:
return False, f"Password must be at least {Validators.PASSWORD_MIN_LENGTH} characters"
if len(password) > Validators.PASSWORD_MAX_LENGTH:
return False, "Password is too long"
if not re.search(r'[A-Z]', password):
return False, "Password must contain at least one uppercase letter"
if not re.search(r'[a-z]', password):
return False, "Password must contain at least one lowercase letter"
if not re.search(r'\d', password):
return False, "Password must contain at least one number"
return True, None
@staticmethod
def validate_name(name: str) -> Tuple[bool, Optional[str]]:
"""
Validate user name.
Args:
name: Name to validate
Returns:
Tuple of (is_valid, error_message)
"""
if not name:
return False, "Name is required"
name = name.strip()
if len(name) < 2:
return False, "Name must be at least 2 characters"
if len(name) > 100:
return False, "Name is too long"
# Allow letters, spaces, hyphens, and apostrophes
if not re.match(r"^[a-zA-Z\s\-']+$", name):
return False, "Name contains invalid characters"
return True, None
@staticmethod
def validate_otp(otp: str) -> Tuple[bool, Optional[str]]:
"""
Validate OTP format.
Args:
otp: OTP to validate
Returns:
Tuple of (is_valid, error_message)
"""
if not otp:
return False, "Verification code is required"
otp = otp.strip()
if len(otp) != Config.OTP_LENGTH:
return False, f"Verification code must be {Config.OTP_LENGTH} digits"
if not otp.isdigit():
return False, "Verification code must contain only numbers"
return True, None
@staticmethod
def validate_document_type(doc_type: str) -> Tuple[bool, Optional[str]]:
"""
Validate document type.
Args:
doc_type: Document type to validate
Returns:
Tuple of (is_valid, error_message)
"""
valid_types = ['insurance', 'academic', 'id', 'financial', 'medical', 'general']
if not doc_type:
return False, "Document type is required"
if doc_type.lower() not in valid_types:
return False, f"Invalid document type. Must be one of: {', '.join(valid_types)}"
return True, None
@staticmethod
def validate_file(file, max_size: int = None) -> Tuple[bool, Optional[str]]:
"""
Validate uploaded file.
Args:
file: Flask file object
max_size: Maximum file size in bytes
Returns:
Tuple of (is_valid, error_message)
"""
if not file or not file.filename:
return False, "File is required"
# Check file extension
filename = file.filename.lower()
allowed = Config.ALLOWED_EXTENSIONS
if not any(filename.endswith(f'.{ext}') for ext in allowed):
return False, f"File type not allowed. Allowed types: {', '.join(allowed)}"
# Check file size (if seekable)
if max_size:
try:
file.seek(0, 2) # Seek to end
size = file.tell()
file.seek(0) # Seek back to start
if size > max_size:
max_mb = max_size / (1024 * 1024)
return False, f"File size exceeds {max_mb:.1f}MB limit"
except Exception:
pass # Can't check size, continue
return True, None
@staticmethod
def sanitize_string(value: str, max_length: int = 255) -> str:
"""
Sanitize a string input.
Args:
value: String to sanitize
max_length: Maximum length
Returns:
Sanitized string
"""
if not value:
return ""
# Strip whitespace
value = value.strip()
# Truncate if too long
if len(value) > max_length:
value = value[:max_length]
return value
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