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LittleBeast / src / Std / Lib / Tls / Stream.php
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1<?php
2/*************************************************************
3# 076 License
4
5Copyright (c) テクニカル諏訪子
6
7Permission is hereby granted to any person obtaining a copy of the software
8Little Beast (the "Software") to use, modify, merge, copy, publish, distribute,
9sublicense, and/or sell copies of the Software, subject to the following conditions:
10
11 1. **Origin Attribution**:
12 - You must not misrepresent the origin of the Software; you must not claim
13 you created the original Software.
14 - If the Software is used in a product, you must either:
15 a. Provide clear attribution in the product's documentation, user interface,
16 or other visible areas, **OR**
17 b. Pay the original developers a fee they specify in writing.
18 2. **Usage Restriction**:
19 - The Software, or any derivative works, dependencies, or libraries
20 incorporating it, must not be used for censorship or to suppress freedom of
21 speech, expression, or creativity. Prohibited uses include, but are not
22 limited to:
23 - Censorship of so-called "hate speech", visuals, non-mainstream opinions,
24 ideas, or objective reality.
25 - Tools or systems designed to restrict access to information or
26 artistic works.
27 3. **Notice Preservation**:
28 - This license and the above copyright notice must remain intact in all copies
29 of the source code.
30
31THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
32INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
33PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
34HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
35CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
36OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
37 */
38namespace Std\Lib\Tls;
39
40/**
41 * TLSの接続をPHPのストリームにする（fread・fgets・fwrite・feof・fclose・stream_set_timeout・stream_selectが使える）
42 *
43 * Std\Lib\Tls::connect()等が作るので、直接使わない。
44 * 読み込み中のエラーは例外にせず、終わり（feof）として扱う（Std\Lib\Tls::error()で確認出来る）。
45 */
46class Stream {
47 public const SCHEME = 'lbtls';
48
49 /** @var resource|null */
50 public $context;
51 private ?Connection $conn = null;
52 private static array $pending = [];
53
54 /**
55 * 接続をストリームにする
56 *
57 * @param Connection $conn ハンドシェイク済みの接続
58 * @return resource
59 */
60 public static function wrap(Connection $conn) {
61 if (!in_array(self::SCHEME, stream_get_wrappers(), true)) stream_wrapper_register(self::SCHEME, self::class);
62 $id = spl_object_id($conn);
63 self::$pending[$id] = $conn;
64 $s = fopen(self::SCHEME.'://'.$id, 'r+');
65 unset(self::$pending[$id]);
66 // PHPのバッファで書き込みが遅れない様に
67 stream_set_write_buffer($s, 0);
68 // シーク出来ないストリームにする（stream_seekが無いので失敗し、PHPが印を付ける）。
69 // シーク出来るストリームにfwriteすると、PHPは読み込みのバッファ（まだ読んでいない受信データ）を捨てる
70 @fseek($s, 0, SEEK_CUR);
71 return $s;
72 }
73
74 /** ストリームの接続（Tls::info()等） */
75 public static function connection($stream): ?Connection {
76 if (!is_resource($stream)) return null;
77 $w = stream_get_meta_data($stream)['wrapper_data'] ?? null;
78 return $w instanceof self ? $w->conn : null;
79 }
80
81 public function stream_open(string $path, string $mode, int $options, ?string &$opened): bool {
82 $id = (int)substr($path, strlen(self::SCHEME) + 3);
83 $this->conn = self::$pending[$id] ?? null;
84 return $this->conn !== null;
85 }
86
87 public function stream_read(int $count): string|false {
88 return $this->conn->read($count);
89 }
90
91 public function stream_write(string $data): int {
92 try {
93 return $this->conn->write($data);
94 } catch (TlsException $e) {
95 return 0;
96 }
97 }
98
99 public function stream_eof(): bool {
100 return $this->conn->eof();
101 }
102
103 public function stream_close(): void {
104 $this->conn?->close();
105 }
106
107 public function stream_flush(): bool {
108 return true;
109 }
110
111 public function stream_set_option(int $option, int $arg1, ?int $arg2): bool {
112 if ($option === STREAM_OPTION_READ_TIMEOUT) return stream_set_timeout($this->conn->socket(), $arg1, (int)$arg2);
113 if ($option === STREAM_OPTION_BLOCKING) return $arg1 === 1; // ブロッキングのみ
114 return false;
115 }
116
117 /** stream_select()用に下のソケットを返す */
118 public function stream_cast(int $castAs) {
119 return $this->conn->socket();
120 }
121
122 public function stream_stat(): array {
123 return [];
124 }
125}