82 lines
1.8 KiB
PHP
82 lines
1.8 KiB
PHP
<?php
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namespace Server\Protocol;
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class WebSocket extends Protocol
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{
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//
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public function decode($received): ?string
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{
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$decoded = null;
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$buffer = $received;
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$len = ord($buffer[1]) & 127;
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if ($len === 126) {
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$masks = substr($buffer, 4, 4);
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$data = substr($buffer, 8);
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} else {
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if ($len === 127) {
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$masks = substr($buffer, 10, 4);
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$data = substr($buffer, 14);
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} else {
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$masks = substr($buffer, 2, 4);
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$data = substr($buffer, 6);
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}
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}
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for ($index = 0; $index < strlen($data); $index++) {
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$decoded .= $data[$index] ^ $masks[$index % 4];
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}
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return $decoded;
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}
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const BINARY_TYPE_BLOB = "\x81";
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public function encode($buffer): string
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{
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$len = strlen($buffer);
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$first_byte = self::BINARY_TYPE_BLOB;
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if ($len <= 125) {
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$encode_buffer = $first_byte . chr($len) . $buffer;
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} else {
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if ($len <= 65535) {
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$encode_buffer = $first_byte . chr(126) . pack("n", $len) . $buffer;
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} else {
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//pack("xxxN", $len)pack函数只处理2的32次方大小的文件，实际上2的32次方已经4G了。
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$encode_buffer = $first_byte . chr(127) . pack("xxxxN", $len) . $buffer;
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}
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}
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return $encode_buffer;
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}
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/**
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* @param $data
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* @return string
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*/
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private function getWebSocketProtocol($data): string
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{
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[$http_protocol, $body] = $this->resolveProtocol($data);
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$key = base64_encode(sha1($http_protocol['Sec-WebSocket-Key'] . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', TRUE));
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$headers = [
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'HTTP/1.1 101 Switching Protocols',
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'Upgrade: websocket',
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'Connection: Upgrade',
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'Sec-WebSocket-Accept: ' . $key,
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'Sec-WebSocket-Version: 13',
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];
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if (isset($http_protocol['Sec-WebSocket-Protocol'])) {
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$headers[] = 'Sec-WebSocket-Protocol: ' . $http_protocol['Sec-WebSocket-Protocol'];
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}
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return implode("\r\n", $headers) . "\r\n\r\n";
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}
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}
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