Input Validator

1#!/usr/bin/env python3
2"""Validate user-provided inputs before AWS CLI or API calls."""
3import re
4import sys
5
6VALIDATORS = {
7    "instance_name": (
8        r"^[a-zA-Z][a-zA-Z0-9-]{0,62}$",
9        "Must start with letter, alphanumeric/hyphens, max 63 chars",
10    ),
11    "instance_type": (
12        r"^db\.influx\.(medium|large|x?large|[0-9]+xlarge)$",
13        "Must be db.influx.{medium|large|xlarge|Nxlarge}",
14    ),
15    "region": (r"^[a-z]{2}-[a-z]+-\d$", "Must be valid AWS region format (e.g., us-east-1)"),
16    "vpc_id": (r"^vpc-[a-f0-9]{8,17}$", "Must be vpc-{hex}"),
17    "subnet_id": (r"^subnet-[a-f0-9]{8,17}$", "Must be subnet-{hex}"),
18    "sg_id": (r"^sg-[a-f0-9]{8,17}$", "Must be sg-{hex}"),
19    "snapshot_id": (r"^[a-zA-Z][a-zA-Z0-9-]{0,254}$", "Must start with letter, max 255 chars"),
20    "storage_gb": (lambda v: 20 <= int(v) <= 16384, "Must be 20-16384"),
21}
22
23
24def validate(key, value):
25    if key not in VALIDATORS:
26        return True, f"No validator for '{key}'"
27    rule = VALIDATORS[key]
28    if callable(rule[0]):
29        try:
30            ok = rule[0](value)
31        except (ValueError, TypeError):
32            ok = False
33    else:
34        ok = bool(re.match(str(rule[0]), value))
35    return ok, rule[1]
36
37
38def validate_all(**kwargs):
39    errors = []
40    for k, v in kwargs.items():
41        ok, msg = validate(k, v)
42        if not ok:
43            errors.append(f"  {k}={v} — {msg}")
44    if errors:
45        print("Validation FAILED:\n" + "\n".join(errors))
46        return False
47    print("All inputs valid.")
48    return True
49
50
51if __name__ == "__main__":
52    pairs = {}
53    for arg in sys.argv[1:]:
54        k, v = arg.split("=", 1)
55        pairs[k] = v
56    sys.exit(0 if validate_all(**pairs) else 1)