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h2.js/h2.mjs
Noratrieb 2ca0fea9a7 gaming
2025-08-16 00:22:59 +02:00

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JavaScript
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import * as net from "node:net";
const buildHuffmanTree = (values) => {
const root = [];
for (const [value, path] of values) {
let cur = root;
for (let i = 0; i < path.length; i++) {
const decision = Number(path[i]);
if (i === path.length - 1) {
cur[decision] = value;
} else {
if (!cur[decision]) {
cur[decision] = [];
}
}
cur = cur[decision];
}
}
return root;
};
const HUFFMAN_EOS = Symbol("EOS");
const HUFFMAN_TREE = buildHuffmanTree([
[String.fromCharCode(0), "1111111111000"],
[String.fromCharCode(1), "11111111111111111011000"],
[String.fromCharCode(2), "1111111111111111111111100010"],
[String.fromCharCode(3), "1111111111111111111111100011"],
[String.fromCharCode(4), "1111111111111111111111100100"],
[String.fromCharCode(5), "1111111111111111111111100101"],
[String.fromCharCode(6), "1111111111111111111111100110"],
[String.fromCharCode(7), "1111111111111111111111100111"],
[String.fromCharCode(8), "1111111111111111111111101000"],
[String.fromCharCode(9), "111111111111111111101010"],
[String.fromCharCode(10), "111111111111111111111111111100"],
[String.fromCharCode(11), "1111111111111111111111101001"],
[String.fromCharCode(12), "1111111111111111111111101010"],
[String.fromCharCode(13), "111111111111111111111111111101"],
[String.fromCharCode(14), "1111111111111111111111101011"],
[String.fromCharCode(15), "1111111111111111111111101100"],
[String.fromCharCode(16), "1111111111111111111111101101"],
[String.fromCharCode(17), "1111111111111111111111101110"],
[String.fromCharCode(18), "1111111111111111111111101111"],
[String.fromCharCode(19), "1111111111111111111111110000"],
[String.fromCharCode(20), "1111111111111111111111110001"],
[String.fromCharCode(21), "1111111111111111111111110010"],
[String.fromCharCode(22), "111111111111111111111111111110"],
[String.fromCharCode(23), "1111111111111111111111110011"],
[String.fromCharCode(24), "1111111111111111111111110100"],
[String.fromCharCode(25), "1111111111111111111111110101"],
[String.fromCharCode(26), "1111111111111111111111110110"],
[String.fromCharCode(27), "1111111111111111111111110111"],
[String.fromCharCode(28), "1111111111111111111111111000"],
[String.fromCharCode(29), "1111111111111111111111111001"],
[String.fromCharCode(30), "1111111111111111111111111010"],
[String.fromCharCode(31), "1111111111111111111111111011"],
[String.fromCharCode(32), "010100"],
[String.fromCharCode(33), "1111111000"],
[String.fromCharCode(34), "1111111001"],
[String.fromCharCode(35), "111111111010"],
[String.fromCharCode(36), "1111111111001"],
[String.fromCharCode(37), "010101"],
[String.fromCharCode(38), "11111000"],
[String.fromCharCode(39), "11111111010"],
[String.fromCharCode(40), "1111111010"],
[String.fromCharCode(41), "1111111011"],
[String.fromCharCode(42), "11111001"],
[String.fromCharCode(43), "11111111011"],
[String.fromCharCode(44), "11111010"],
[String.fromCharCode(45), "010110"],
[String.fromCharCode(46), "010111"],
[String.fromCharCode(47), "011000"],
[String.fromCharCode(48), "00000"],
[String.fromCharCode(49), "00001"],
[String.fromCharCode(50), "00010"],
[String.fromCharCode(51), "011001"],
[String.fromCharCode(52), "011010"],
[String.fromCharCode(53), "011011"],
[String.fromCharCode(54), "011100"],
[String.fromCharCode(55), "011101"],
[String.fromCharCode(56), "011110"],
[String.fromCharCode(57), "011111"],
[String.fromCharCode(58), "1011100"],
[String.fromCharCode(59), "11111011"],
[String.fromCharCode(60), "111111111111100"],
[String.fromCharCode(61), "100000"],
[String.fromCharCode(62), "111111111011"],
[String.fromCharCode(63), "1111111100"],
[String.fromCharCode(64), "1111111111010"],
[String.fromCharCode(65), "100001"],
[String.fromCharCode(66), "1011101"],
[String.fromCharCode(67), "1011110"],
[String.fromCharCode(68), "1011111"],
[String.fromCharCode(69), "1100000"],
[String.fromCharCode(70), "1100001"],
[String.fromCharCode(71), "1100010"],
[String.fromCharCode(72), "1100011"],
[String.fromCharCode(73), "1100100"],
[String.fromCharCode(74), "1100101"],
[String.fromCharCode(75), "1100110"],
[String.fromCharCode(76), "1100111"],
[String.fromCharCode(77), "1101000"],
[String.fromCharCode(78), "1101001"],
[String.fromCharCode(79), "1101010"],
[String.fromCharCode(80), "1101011"],
[String.fromCharCode(81), "1101100"],
[String.fromCharCode(82), "1101101"],
[String.fromCharCode(83), "1101110"],
[String.fromCharCode(84), "1101111"],
[String.fromCharCode(85), "1110000"],
[String.fromCharCode(86), "1110001"],
[String.fromCharCode(87), "1110010"],
[String.fromCharCode(88), "11111100"],
[String.fromCharCode(89), "1110011"],
[String.fromCharCode(90), "11111101"],
[String.fromCharCode(91), "1111111111011"],
[String.fromCharCode(92), "1111111111111110000"],
[String.fromCharCode(93), "1111111111100"],
[String.fromCharCode(94), "11111111111100"],
[String.fromCharCode(95), "100010"],
[String.fromCharCode(96), "111111111111101"],
[String.fromCharCode(97), "00011"],
[String.fromCharCode(98), "100011"],
[String.fromCharCode(99), "00100"],
[String.fromCharCode(100), "100100"],
[String.fromCharCode(101), "00101"],
[String.fromCharCode(102), "100101"],
[String.fromCharCode(103), "100110"],
[String.fromCharCode(104), "100111"],
[String.fromCharCode(105), "00110"],
[String.fromCharCode(106), "1110100"],
[String.fromCharCode(107), "1110101"],
[String.fromCharCode(108), "101000"],
[String.fromCharCode(109), "101001"],
[String.fromCharCode(110), "101010"],
[String.fromCharCode(111), "00111"],
[String.fromCharCode(112), "101011"],
[String.fromCharCode(113), "1110110"],
[String.fromCharCode(114), "101100"],
[String.fromCharCode(115), "01000"],
[String.fromCharCode(116), "01001"],
[String.fromCharCode(117), "101101"],
[String.fromCharCode(118), "1110111"],
[String.fromCharCode(119), "1111000"],
[String.fromCharCode(120), "1111001"],
[String.fromCharCode(121), "1111010"],
[String.fromCharCode(122), "1111011"],
[String.fromCharCode(123), "111111111111110"],
[String.fromCharCode(124), "11111111100"],
[String.fromCharCode(125), "11111111111101"],
[String.fromCharCode(126), "1111111111101"],
[String.fromCharCode(127), "1111111111111111111111111100"],
[String.fromCharCode(128), "11111111111111100110"],
[String.fromCharCode(129), "1111111111111111010010"],
[String.fromCharCode(130), "11111111111111100111"],
[String.fromCharCode(131), "11111111111111101000"],
[String.fromCharCode(132), "1111111111111111010011"],
[String.fromCharCode(133), "1111111111111111010100"],
[String.fromCharCode(134), "1111111111111111010101"],
[String.fromCharCode(135), "11111111111111111011001"],
[String.fromCharCode(136), "1111111111111111010110"],
[String.fromCharCode(137), "11111111111111111011010"],
[String.fromCharCode(138), "11111111111111111011011"],
[String.fromCharCode(139), "11111111111111111011100"],
[String.fromCharCode(140), "11111111111111111011101"],
[String.fromCharCode(141), "11111111111111111011110"],
[String.fromCharCode(142), "111111111111111111101011"],
[String.fromCharCode(143), "11111111111111111011111"],
[String.fromCharCode(144), "111111111111111111101100"],
[String.fromCharCode(145), "111111111111111111101101"],
[String.fromCharCode(146), "1111111111111111010111"],
[String.fromCharCode(147), "11111111111111111100000"],
[String.fromCharCode(148), "111111111111111111101110"],
[String.fromCharCode(149), "11111111111111111100001"],
[String.fromCharCode(150), "11111111111111111100010"],
[String.fromCharCode(151), "11111111111111111100011"],
[String.fromCharCode(152), "11111111111111111100100"],
[String.fromCharCode(153), "111111111111111011100"],
[String.fromCharCode(154), "1111111111111111011000"],
[String.fromCharCode(155), "11111111111111111100101"],
[String.fromCharCode(156), "1111111111111111011001"],
[String.fromCharCode(157), "11111111111111111100110"],
[String.fromCharCode(158), "11111111111111111100111"],
[String.fromCharCode(159), "111111111111111111101111"],
[String.fromCharCode(160), "1111111111111111011010"],
[String.fromCharCode(161), "111111111111111011101"],
[String.fromCharCode(162), "11111111111111101001"],
[String.fromCharCode(163), "1111111111111111011011"],
[String.fromCharCode(164), "1111111111111111011100"],
[String.fromCharCode(165), "11111111111111111101000"],
[String.fromCharCode(166), "11111111111111111101001"],
[String.fromCharCode(167), "111111111111111011110"],
[String.fromCharCode(168), "11111111111111111101010"],
[String.fromCharCode(169), "1111111111111111011101"],
[String.fromCharCode(170), "1111111111111111011110"],
[String.fromCharCode(171), "111111111111111111110000"],
[String.fromCharCode(172), "111111111111111011111"],
[String.fromCharCode(173), "1111111111111111011111"],
[String.fromCharCode(174), "11111111111111111101011"],
[String.fromCharCode(175), "11111111111111111101100"],
[String.fromCharCode(176), "111111111111111100000"],
[String.fromCharCode(177), "111111111111111100001"],
[String.fromCharCode(178), "1111111111111111100000"],
[String.fromCharCode(179), "111111111111111100010"],
[String.fromCharCode(180), "11111111111111111101101"],
[String.fromCharCode(181), "1111111111111111100001"],
[String.fromCharCode(182), "11111111111111111101110"],
[String.fromCharCode(183), "11111111111111111101111"],
[String.fromCharCode(184), "11111111111111101010"],
[String.fromCharCode(185), "1111111111111111100010"],
[String.fromCharCode(186), "1111111111111111100011"],
[String.fromCharCode(187), "1111111111111111100100"],
[String.fromCharCode(188), "11111111111111111110000"],
[String.fromCharCode(189), "1111111111111111100101"],
[String.fromCharCode(190), "1111111111111111100110"],
[String.fromCharCode(191), "11111111111111111110001"],
[String.fromCharCode(192), "11111111111111111111100000"],
[String.fromCharCode(193), "11111111111111111111100001"],
[String.fromCharCode(194), "11111111111111101011"],
[String.fromCharCode(195), "1111111111111110001"],
[String.fromCharCode(196), "1111111111111111100111"],
[String.fromCharCode(197), "11111111111111111110010"],
[String.fromCharCode(198), "1111111111111111101000"],
[String.fromCharCode(199), "1111111111111111111101100"],
[String.fromCharCode(200), "11111111111111111111100010"],
[String.fromCharCode(201), "11111111111111111111100011"],
[String.fromCharCode(202), "11111111111111111111100100"],
[String.fromCharCode(203), "111111111111111111111011110"],
[String.fromCharCode(204), "111111111111111111111011111"],
[String.fromCharCode(205), "11111111111111111111100101"],
[String.fromCharCode(206), "111111111111111111110001"],
[String.fromCharCode(207), "1111111111111111111101101"],
[String.fromCharCode(208), "1111111111111110010"],
[String.fromCharCode(209), "111111111111111100011"],
[String.fromCharCode(210), "11111111111111111111100110"],
[String.fromCharCode(211), "111111111111111111111100000"],
[String.fromCharCode(212), "111111111111111111111100001"],
[String.fromCharCode(213), "11111111111111111111100111"],
[String.fromCharCode(214), "111111111111111111111100010"],
[String.fromCharCode(215), "111111111111111111110010"],
[String.fromCharCode(216), "111111111111111100100"],
[String.fromCharCode(217), "111111111111111100101"],
[String.fromCharCode(218), "11111111111111111111101000"],
[String.fromCharCode(219), "11111111111111111111101001"],
[String.fromCharCode(220), "1111111111111111111111111101"],
[String.fromCharCode(221), "111111111111111111111100011"],
[String.fromCharCode(222), "111111111111111111111100100"],
[String.fromCharCode(223), "111111111111111111111100101"],
[String.fromCharCode(224), "11111111111111101100"],
[String.fromCharCode(225), "111111111111111111110011"],
[String.fromCharCode(226), "11111111111111101101"],
[String.fromCharCode(227), "111111111111111100110"],
[String.fromCharCode(228), "1111111111111111101001"],
[String.fromCharCode(229), "111111111111111100111"],
[String.fromCharCode(230), "111111111111111101000"],
[String.fromCharCode(231), "11111111111111111110011"],
[String.fromCharCode(232), "1111111111111111101010"],
[String.fromCharCode(233), "1111111111111111101011"],
[String.fromCharCode(234), "1111111111111111111101110"],
[String.fromCharCode(235), "1111111111111111111101111"],
[String.fromCharCode(236), "111111111111111111110100"],
[String.fromCharCode(237), "111111111111111111110101"],
[String.fromCharCode(238), "11111111111111111111101010"],
[String.fromCharCode(239), "11111111111111111110100"],
[String.fromCharCode(240), "11111111111111111111101011"],
[String.fromCharCode(241), "111111111111111111111100110"],
[String.fromCharCode(242), "11111111111111111111101100"],
[String.fromCharCode(243), "11111111111111111111101101"],
[String.fromCharCode(244), "111111111111111111111100111"],
[String.fromCharCode(245), "111111111111111111111101000"],
[String.fromCharCode(246), "111111111111111111111101001"],
[String.fromCharCode(247), "111111111111111111111101010"],
[String.fromCharCode(248), "111111111111111111111101011"],
[String.fromCharCode(249), "1111111111111111111111111110"],
[String.fromCharCode(250), "111111111111111111111101100"],
[String.fromCharCode(251), "111111111111111111111101101"],
[String.fromCharCode(252), "111111111111111111111101110"],
[String.fromCharCode(253), "111111111111111111111101111"],
[String.fromCharCode(254), "111111111111111111111110000"],
[String.fromCharCode(255), "11111111111111111111101110"],
[HUFFMAN_EOS, "111111111111111111111111111111"],
]);
class HPackCtx {
#dynamicTable;
static #STATIC_TABLE = {
1: [":authority", ""],
2: [":method", "GET"],
3: [":method", "POST"],
4: [":path", "/"],
5: [":path", "/index.html"],
6: [":scheme", "http"],
7: [":scheme", "https"],
8: [":status", "200"],
9: [":status", "204"],
10: [":status", "206"],
11: [":status", "304"],
12: [":status", "400"],
13: [":status", "404"],
14: [":status", "500"],
15: ["accept-charset", ""],
16: ["accept-encoding", "gzip, deflate"],
17: ["accept-language", ""],
18: ["accept-ranges", ""],
19: ["accept", ""],
20: ["access-control-allow-origin", ""],
21: ["age", ""],
22: ["allow", ""],
23: ["authorization", ""],
24: ["cache-control", ""],
25: ["content-disposition", ""],
26: ["content-encoding", ""],
27: ["content-language", ""],
28: ["content-length", ""],
29: ["content-location", ""],
30: ["content-range", ""],
31: ["content-type", ""],
32: ["cookie", ""],
33: ["date", ""],
34: ["etag", ""],
35: ["expect", ""],
36: ["expires", ""],
37: ["from", ""],
38: ["host", ""],
39: ["if-match", ""],
40: ["if-modified-since", ""],
41: ["if-none-match", ""],
42: ["if-range", ""],
43: ["if-unmodified-since", ""],
44: ["last-modified", ""],
45: ["link", ""],
46: ["location", ""],
47: ["max-forwards", ""],
48: ["proxy-authenticate", ""],
49: ["proxy-authorization", ""],
50: ["range", ""],
51: ["referer", ""],
52: ["refresh", ""],
53: ["retry-after", ""],
54: ["server", ""],
55: ["set-cookie", ""],
56: ["strict-transport-security", ""],
57: ["transfer-encoding", ""],
58: ["user-agent", ""],
59: ["vary", ""],
60: ["via", ""],
61: ["www-authenticate", ""],
};
static #STATIC_TABLE_MAX = 61;
constructor() {
this.#dynamicTable = {};
}
#indexTable = (index) => {
return index < HPackCtx.#STATIC_TABLE_MAX
? HPackCtx.#STATIC_TABLE[index]
: this.#dynamicTable[index - HPackCtx.#STATIC_TABLE_MAX];
};
decode = (block) => {
const fields = [];
while (block.length > 0) {
let size = 0;
const firstBit = block[0] & 128;
const secondBit = block[0] & 64;
const thirdBit = block[0] & 32;
const fourthBit = block[0] & 16;
let field;
const decodeInteger = (mask) => {
const int = block[size] & (0xff >> mask);
if (int === 0xff >> mask) {
throw new Error("long integer, todo");
}
size += 1;
return int;
};
const decodeHuffman = (length) => {
let string = "";
let remaining = length;
let cur = HUFFMAN_TREE;
while (remaining > 0) {
const nextOctet = block[size];
for (let i = 7; i >= 0; i--) {
const nextBit = (nextOctet >> i) & 0x01;
cur = cur[nextBit ? 1 : 0];
if (typeof cur === "string") {
string += cur;
cur = HUFFMAN_TREE;
} else if (typeof cur === "symbol" && cur === HUFFMAN_EOS) {
throw new Error("what");
}
}
size++;
remaining--;
}
return string;
};
const decodeString = () => {
const huffman = block[size] & 128;
const length = decodeInteger(1);
if (huffman) {
return decodeHuffman(length);
} else {
size += length;
return new TextDecoder().decode(block.subarray(size, length));
}
};
// Indexed Header Field Representation
if (firstBit) {
const index = decodeInteger(1);
const tabled = this.#indexTable(index);
field = tabled;
} else {
// Literal Header Field with Incremental Indexing
if (secondBit) {
const index = decodeInteger(2);
let headerName;
if (index === 0) {
headerName = decodeString();
} else {
headerName = this.#indexTable(index)[0];
}
const headerValue = decodeString();
field = [headerName, headerValue];
} else {
throw new Error("some other encoding");
}
}
if (typeof field === "undefined") {
throw new Error("field was not set");
}
fields.push(field);
if (size === 0) {
throw new Error("size was not set");
}
block = block.subarray(size);
}
return fields;
};
encode = () => {};
}
const FRAME_TYPE = {
DATA: 0x0,
HEADERS: 0x1,
PRIORITY: 0x2,
RST_STREAM: 0x3,
SETTINGS: 0x04,
PUSH_PROMISE: 0x5,
PING: 0x6,
GOAWAY: 0x7,
WINDOW_UPDATE: 0x08,
CONTINUATION: 0x09,
};
const FRAME_TYPE_NAME = Object.fromEntries(
Object.entries(FRAME_TYPE).map(([k, v]) => [v, k])
);
const SETTING = {
SETTINGS_HEADER_TABLE_SIZE: 0x01,
SETTINGS_ENABLE_PUSH: 0x02,
SETTINGS_MAX_CONCURRENT_STREAMS: 0x03,
SETTINGS_INITIAL_WINDOW_SIZE: 0x04,
SETTINGS_MAX_FRAME_SIZE: 0x05,
SETTINGS_MAX_HEADER_LIST_SIZE: 0x06,
};
const SETTING_NAME = Object.fromEntries(
Object.entries(SETTING).map(([k, v]) => [v, k])
);
const FRAME_HEADER_SIZE = 3 + 1 + 1 + 4;
const frameReader = (frameCb) => {
const STATE = {
PREFACE: 0,
FRAME_HEAD: 1,
FRAME_PAYLOAD: 2,
};
const CONNECTION_PREFACE = new TextEncoder().encode(
"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
);
let state = STATE.PREFACE;
let frameHead;
let buf = Buffer.from([]);
return (data) => {
buf = Buffer.concat([buf, data]);
while (true) {
switch (state) {
case STATE.PREFACE: {
if (buf.length < 24) {
return;
}
const preface = buf.subarray(0, 24);
buf = buf.subarray(24);
if (Buffer.compare(preface, CONNECTION_PREFACE) !== 0) {
frameCb(new Error(`invalid preface from ${peer}`));
return;
}
state = STATE.FRAME_HEAD;
break;
}
case STATE.FRAME_HEAD: {
if (buf.length < FRAME_HEADER_SIZE) {
return;
}
const frameHeader = buf.subarray(0, FRAME_HEADER_SIZE);
buf = buf.subarray(FRAME_HEADER_SIZE);
const length =
(frameHeader[0] << 16) | (frameHeader[1] << 8) | frameHeader[2];
const type = frameHeader[3];
const flags = frameHeader[4];
const streamIdentifier =
frameHeader.readUint32BE(5) & (0xff_ff_ff_ff >> 1);
state = STATE.FRAME_PAYLOAD;
frameHead = {
length,
type,
flags,
streamIdentifier,
};
break;
}
case STATE.FRAME_PAYLOAD: {
if (buf.length < frameHead.length) {
return;
}
const payload = buf.subarray(0, frameHead.length);
buf = buf.subarray(frameHead.length);
frameCb(null, {
...frameHead,
payload,
});
state = STATE.FRAME_HEAD;
break;
}
default:
throw new Error("unknown state", state);
}
}
};
};
const encodeFrame = (frame) => {
if (typeof frame.flags !== "number") {
throw new Error(`Flags of frame are not number: ${frame.flags}`);
}
if (typeof frame.type !== "number") {
throw new Error(`Type of frame is not a number: ${frame.type}`);
}
const length = frame.payload.length;
const buffer = Buffer.alloc(FRAME_HEADER_SIZE + length);
if (length > 2 ** 24) {
throw new Error(`Frame is too long: ${length}`);
}
buffer[0] = length >> 16;
buffer[1] = (length >> 8) & 0xff;
buffer[2] = length & 0xff;
if (!(frame.type in FRAME_TYPE_NAME)) {
throw new Error(`Trying to write unknown frame type: ${frame.type}`);
}
buffer[3] = frame.type;
if (frame.flags > 0xff) {
throw new Error(`Frame flags do not fit in a byte: ${frame.flags}`);
}
buffer[4] = frame.flags;
buffer.writeUint32BE(length, 5);
frame.payload.copy(buffer, FRAME_HEADER_SIZE);
return buffer;
};
/**
* @param {net.Socket} socket
*/
const handleConnection = (socket) => {
const peer = `${socket.remoteAddress}:${socket.remotePort}`;
console.log(`received connection from ${peer}`);
const hpackDecode = new HPackCtx();
const hpackEncode = new HPackCtx();
const peerSettings = new Map();
const streams = new Map();
socket.write(
encodeFrame({
type: FRAME_TYPE.SETTINGS,
flags: 0,
payload: Buffer.from([]),
})
);
const onData = frameReader((err, frame) => {
if (err) {
console.warn("error from frame layer", err);
socket.destroy();
return;
}
console.log("received frame", FRAME_TYPE_NAME[frame.type], frame);
switch (frame.type) {
case FRAME_TYPE.HEADERS: {
if (!streams.has(frame.streamIdentifier)) {
streams.set(frame.streamIdentifier, {
headerBuffer: Buffer.from([]),
endHeaders: false,
});
}
// END_HEADERS
if ((frame.flags & 0x04) !== 0) {
streams.get(frame.streamIdentifier).endHeaders = true;
}
// PRIORITY
const priorityFlag = (frame.flags & 0x20) !== 0;
// PADDED
const paddedFlag = (frame.flags & 0x08) !== 0;
let payload = frame.payload;
let paddingLength = 0;
if (paddedFlag) {
paddingLength = payload[0];
payload = payload.subarray(1);
}
if (priorityFlag) {
// skip over Exclusive/Stream Dependency, Weight
payload = payload.subarray(5);
}
if (paddedFlag) {
if (paddingLength > payload.length) {
console.warn("too much padding");
socket.destroy();
return;
}
payload = payload.subarray(0, payload.length - paddingLength);
}
if (streams.get(frame.streamIdentifier).endHeaders) {
const fieldBlockFragement = payload;
const fields = hpackDecode.decode(fieldBlockFragement);
console.log("headers", fields);
// we got a request!!!
} else {
throw new Error("expecting CONTINUATION is not yet supported");
}
break;
}
case FRAME_TYPE.SETTINGS: {
// ACK
if ((frame.flags & 0x1) !== 0) {
if (frame.length !== 0) {
console.warn("received non-empty SETTINGS ack frame");
socket.destroy();
return;
}
break;
}
if (frame.streamIdentifier !== 0) {
console.warn("stream identifier for a SETTINGS");
socket.destroy();
return;
}
if (frame.length % 6 !== 0) {
console.warn("invalid length for SETTINGS frame");
socket.destroy();
return;
}
for (let i = 0; i < frame.length; i += 6) {
const identifier = frame.payload.readUint16BE(i);
const value = frame.payload.readUint32BE(i + 2);
console.log("SETTINGS setting", SETTING_NAME[identifier], "=", value);
peerSettings[SETTING_NAME[identifier]] = value;
}
break;
}
case FRAME_TYPE.WINDOW_UPDATE: {
// whatever
const increment = frame.payload.readUint32BE();
console.log("incrementing transfer window by", increment);
break;
}
default: {
console.warn(
`unsupported frame type ${FRAME_TYPE_NAME[frame.type] ?? frame.type}`
);
}
}
});
socket.on("data", onData);
socket.on("error", (err) => {
console.warn(`error from ${peer}:`, err);
});
socket.on("close", () => {
console.log(`connection closed for ${peer}`);
});
};
const server = net.createServer(handleConnection).on("error", (err) => {
console.error(`error: ${err}`);
});
server.listen(8080, () => {
console.log("Listening on", server.address());
});
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