File size: 1,974 Bytes
e197abb | 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 | import re
from typing import Any, Callable
EMAIL_RE = re.compile(r'^[\w.+-]+@[\w-]+\.[\w.-]+$')
PHONE_RE = re.compile(r'^\+?[\d\s\-().]{7,20}$')
Rule = Callable[[str, Any], str | None]
def required(field: str, value: Any) -> str | None:
if value is None or (isinstance(value, str) and not value.strip()):
return f"{field} is required"
return None
def min_len(n: int) -> Rule:
def check(field: str, value: Any) -> str | None:
if value is not None and len(str(value)) < n:
return f"{field} must be at least {n} characters"
return None
return check
def max_len(n: int) -> Rule:
def check(field: str, value: Any) -> str | None:
if value is not None and len(str(value)) > n:
return f"{field} must be at most {n} characters"
return None
return check
def is_email(field: str, value: Any) -> str | None:
if value and not EMAIL_RE.match(str(value)):
return f"{field} is not a valid email"
return None
def is_phone(field: str, value: Any) -> str | None:
if value and not PHONE_RE.match(str(value)):
return f"{field} is not a valid phone number"
return None
def is_positive(field: str, value: Any) -> str | None:
try:
if float(value) <= 0:
return f"{field} must be positive"
except (TypeError, ValueError):
return f"{field} must be a number"
return None
def one_of(*choices: Any) -> Rule:
def check(field: str, value: Any) -> str | None:
if value not in choices:
opts = ", ".join(map(str, choices))
return f"{field} must be one of: {opts}"
return None
return check
def validate(data: dict[str, Any], rules: dict[str, list[Rule]]) -> list[str]:
errors: list[str] = []
for field, checks in rules.items():
for rule in checks:
err = rule(field, data.get(field))
if err:
errors.append(err)
return errors
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