gmail-smtp / google-api-php-client / vendor / guzzlehttp / guzzle / src / Handler / HeaderProcessor.php

HeaderProcessor.php in Gmail SMTP trunk, at google-api-php-client/vendor/guzzlehttp/guzzle/src/Handler/HeaderProcessor.php

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1	<?php
2
3	namespace GuzzleHttp\Handler;
4
5	use GuzzleHttp\Utils;
6
7	/**
8	* @internal
9	*/
10	final class HeaderProcessor
11	{
12	/**
13	* Returns the HTTP version, status code, reason phrase, and headers.
14	*
15	* @param string[] $headers
16	*
17	* @return array{0:string, 1:int, 2:?string, 3:array}
18	*
19	* @throws \RuntimeException
20	*/
21	public static function parseHeaders(array $headers): array
22	{
23	if ($headers === []) {
24	throw new \RuntimeException('Expected a non-empty array of header data');
25	}
26
27	$headers = self::getLastHeaderBlock(\array_values($headers));
28
29	$statusLine = \array_shift($headers);
30	if ($statusLine === null) {
31	throw new \RuntimeException('Expected a non-empty array of header data');
32	}
33
34	$parts = \explode(' ', $statusLine, 3);
35	$version = \explode('/', $parts[0])[1] ?? null;
36
37	if ($version === null) {
38	throw new \RuntimeException('HTTP version missing from header data');
39	}
40
41	$status = $parts[1] ?? null;
42
43	if ($status === null) {
44	throw new \RuntimeException('HTTP status code missing from header data');
45	}
46
47	if (!\preg_match('/^\d{3}$/', $status)) {
48	throw new \RuntimeException('HTTP status code is invalid');
49	}
50
51	foreach ($headers as $header) {
52	if (\strpos($header, ':') === false) {
53	throw new \RuntimeException('HTTP header line is invalid');
54	}
55	}
56
57	return [$version, (int) $status, $parts[2] ?? null, Utils::headersFromLines($headers)];
58	}
59
60	/**
61	* @param non-empty-list<string> $headers
62	*
63	* @return list<string>
64	*/
65	private static function getLastHeaderBlock(array $headers): array
66	{
67	$lastStatusLine = 0;
68
69	foreach ($headers as $index => $line) {
70	if (\preg_match('/^HTTP\/\S+\s+/i', $line)) {
71	$lastStatusLine = $index;
72	}
73	}
74
75	return \array_slice($headers, $lastStatusLine);
76	}
77	}
78