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1<?php
2declare(strict_types=1);
3/**
4 * Pop PHP Framework (https://www.popphp.org/)
5 *
6 * @link       https://github.com/popphp/popphp-framework
7 * @author     Nick Sagona, III <dev@noladev.com>
8 * @copyright  Copyright (c) 2009-2027 NOLA Interactive, LLC.
9 * @license    https://www.popphp.org/license     New BSD License
10 */
11
12/**
13 * @namespace
14 */
15namespace Pop\Mime\Part\Body;
16
17/**
18 * MIME part body encoding enum
19 *
20 * @category   Pop
21 * @package    Pop\Mime
22 * @author     Nick Sagona, III <dev@noladev.com>
23 * @copyright  Copyright (c) 2009-2027 NOLA Interactive, LLC.
24 * @license    https://www.popphp.org/license     New BSD License
25 * @version    3.0.0
26 */
27enum Encoding: string
28{
29    case BASE64           = 'base64';
30    case QUOTED_PRINTABLE = 'quoted-printable';
31    case URL              = 'URL';
32    case RAW_URL          = 'RAW_URL';
33    case BINARY           = 'binary';
34    case _7BIT            = '7bit';
35    case _8BIT            = '8bit';
36
37    /**
38     * Map to the Content-Transfer-Encoding wire token, or null for encodings
39     * that aren't a real MIME transfer encoding (URL/RAW_URL are used for
40     * HTTP form-field encoding, not message wire format).
41     *
42     * @return ?string
43     */
44    public function toHeaderValue(): ?string
45    {
46        return match ($this) {
47            self::URL, self::RAW_URL => null,
48            default                  => $this->value,
49        };
50    }
51
52    /**
53     * Map a Content-Transfer-Encoding header value (case-insensitive) back
54     * to its Encoding case, or null if unrecognized.
55     *
56     * @param  string $value
57     * @return ?self
58     */
59    public static function fromHeaderValue(string $value): ?self
60    {
61        return self::tryFrom(strtolower($value));
62    }
63}