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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Core\Emitter; |
| 6 | |
| 7 | use Celema\Core\Exception\RuntimeException; |
| 8 | use Override; |
| 9 | use Psr\Http\Message\ResponseInterface as Response; |
| 10 | use Psr\Http\Message\StreamInterface as Stream; |
| 11 | |
| 12 | /** |
| 13 | * Derived from the SAPI emitters of laminas/laminas-httphandlerrunner, |
| 14 | * copyright (c) 2020 Laminas Project a Series of LF Projects, LLC, |
| 15 | * distributed under the BSD-3-Clause license. See LICENSE.md. |
| 16 | * |
| 17 | * @api |
| 18 | */ |
| 19 | final class Sapi implements Emitter |
| 20 | { |
| 21 | public function __construct( |
| 22 | private readonly int $maxBufferLength = 8192, |
| 23 | ) {} |
| 24 | |
| 25 | #[Override] |
| 26 | public function emit(Response $response, bool $withoutBody = false): bool |
| 27 | { |
| 28 | $this->assertNoPreviousOutput(); |
| 29 | $this->emitHeaders($response); |
| 30 | $this->emitStatusLine($response); |
| 31 | flush(); |
| 32 | |
| 33 | if ($withoutBody || $this->isBodyless($response->getStatusCode())) { |
| 34 | return true; |
| 35 | } |
| 36 | |
| 37 | $range = $this->contentRange($response->getHeaderLine('Content-Range')); |
| 38 | |
| 39 | if ($range === null) { |
| 40 | $this->emitBody($response->getBody()); |
| 41 | } else { |
| 42 | $this->emitBodyRange($response->getBody(), $range[0], $range[1]); |
| 43 | } |
| 44 | |
| 45 | return true; |
| 46 | } |
| 47 | |
| 48 | private function assertNoPreviousOutput(): void |
| 49 | { |
| 50 | if (headers_sent($file, $line)) { |
| 51 | throw new RuntimeException("Headers already sent in {$file} on line {$line}"); |
| 52 | } |
| 53 | |
| 54 | if (ob_get_level() > 0 && ob_get_length() > 0) { |
| 55 | throw new RuntimeException('Output already present in the output buffer'); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Emitted before the status line so PHP cannot override the status |
| 61 | * code with one derived from a header like Location. |
| 62 | */ |
| 63 | private function emitHeaders(Response $response): void |
| 64 | { |
| 65 | $statusCode = $response->getStatusCode(); |
| 66 | |
| 67 | foreach ($response->getHeaders() as $name => $values) { |
| 68 | $name = ucwords((string) $name, '-'); |
| 69 | $replace = $name !== 'Set-Cookie'; |
| 70 | |
| 71 | foreach ($values as $value) { |
| 72 | header("{$name}: {$value}", $replace, $statusCode); |
| 73 | $replace = false; |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | private function emitStatusLine(Response $response): void |
| 79 | { |
| 80 | $statusCode = $response->getStatusCode(); |
| 81 | $reasonPhrase = $response->getReasonPhrase(); |
| 82 | |
| 83 | header( |
| 84 | sprintf( |
| 85 | 'HTTP/%s %d%s', |
| 86 | $response->getProtocolVersion(), |
| 87 | $statusCode, |
| 88 | $reasonPhrase === '' ? '' : " {$reasonPhrase}", |
| 89 | ), |
| 90 | true, |
| 91 | $statusCode, |
| 92 | ); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * A 1xx, 204, or 304 response must not include a body (RFC 9110). |
| 97 | */ |
| 98 | private function isBodyless(int $statusCode): bool |
| 99 | { |
| 100 | return $statusCode < 200 || $statusCode === 204 || $statusCode === 304; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Returns [first, last] byte positions from a valid bytes Content-Range |
| 105 | * header, or null when the whole body should be emitted. |
| 106 | * |
| 107 | * @return array{0: int, 1: int}|null |
| 108 | */ |
| 109 | private function contentRange(string $header): ?array |
| 110 | { |
| 111 | if (preg_match('/^bytes (?P<first>\d+)-(?P<last>\d+)\/(?:\d+|\*)$/', $header, $matches) !== 1) { |
| 112 | return null; |
| 113 | } |
| 114 | |
| 115 | $first = (int) $matches['first']; |
| 116 | $last = (int) $matches['last']; |
| 117 | |
| 118 | return $first <= $last ? [$first, $last] : null; |
| 119 | } |
| 120 | |
| 121 | private function emitBody(Stream $body): void |
| 122 | { |
| 123 | if ($body->isSeekable()) { |
| 124 | $body->rewind(); |
| 125 | } |
| 126 | |
| 127 | if (!$body->isReadable()) { |
| 128 | echo (string) $body; |
| 129 | |
| 130 | return; |
| 131 | } |
| 132 | |
| 133 | while (!$body->eof()) { |
| 134 | echo $body->read($this->maxBufferLength); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | private function emitBodyRange(Stream $body, int $first, int $last): void |
| 139 | { |
| 140 | $length = $last - $first + 1; |
| 141 | |
| 142 | if ($body->isSeekable()) { |
| 143 | $body->seek($first); |
| 144 | $first = 0; |
| 145 | } |
| 146 | |
| 147 | if (!$body->isReadable()) { |
| 148 | echo substr($body->getContents(), $first, $length); |
| 149 | |
| 150 | return; |
| 151 | } |
| 152 | |
| 153 | $remaining = $length; |
| 154 | |
| 155 | while ($remaining >= $this->maxBufferLength && !$body->eof()) { |
| 156 | $contents = $body->read($this->maxBufferLength); |
| 157 | $remaining -= strlen($contents); |
| 158 | echo $contents; |
| 159 | } |
| 160 | |
| 161 | if ($remaining > 0 && !$body->eof()) { |
| 162 | echo $body->read($remaining); |
| 163 | } |
| 164 | } |
| 165 | } |