1
// Copyright (c) 2017-2022 Cloudflare, Inc.
2
// Licensed under the Apache 2.0 license found in the LICENSE file or at:
3
//     https://opensource.org/licenses/Apache-2.0
4
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
5
 
6
import {
7
  ERR_INVALID_HTTP_TOKEN,
8
  ERR_INVALID_CHAR,
9
  ERR_HTTP_INVALID_HEADER_VALUE,
10
} from 'node-internal:internal_errors';
11
 
12
const tokenRegExp = /^[\^_`a-zA-Z\-0-9!#$%&'*+.|~]+$/;
13
/**
14
 * Verifies that the given val is a valid HTTP token
15
 * per the rules defined in RFC 7230
16
 * See https://tools.ietf.org/html/rfc7230#section-3.2.6
17
 */
18
export function _checkIsHttpToken(val: string): boolean {
19
  return tokenRegExp.test(val);
20
}
21
 
22
const headerCharRegex = /[^\t\x20-\x7e\x80-\xff]/;
23
/**
24
 * True if val contains an invalid field-vchar
25
 *  field-value    = *( field-content / obs-fold )
26
 *  field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
27
 *  field-vchar    = VCHAR / obs-text
28
 */
29
export function _checkInvalidHeaderChar(
30
  val: number | string | ReadonlyArray<string>
31
): boolean {
32
  if (Array.isArray(val)) {
33
    return val.some((v: string) => headerCharRegex.test(v));
34
  }
35
  return headerCharRegex.test(`${val}`);
36
}
37
 
38
export function validateHeaderName(
39
  name: string,
40
  label: string = 'Header name'
41
): void {
42
  if (typeof name !== 'string' || !name || !_checkIsHttpToken(name)) {
43
    throw new ERR_INVALID_HTTP_TOKEN(label, name);
44
  }
45
}
46
 
47
export function validateHeaderValue(
48
  name: string,
49
  value: number | string | ReadonlyArray<string> | undefined
50
): asserts value is string {
51
  if (value === undefined) {
52
    throw new ERR_HTTP_INVALID_HEADER_VALUE(value, name);
53
  }
54
  if (_checkInvalidHeaderChar(value)) {
55
    throw new ERR_INVALID_CHAR('header content', name);
56
  }
57
}
58
 
59
export function utcDate(): string {
60
  return new Date().toUTCString();
61
}
62
 
63
export const chunkExpression = /(?:^|\W)chunked(?:$|\W)/i;