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fix(route/bilibili): manga update drop wasm (#23391)

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This commit is contained in:
Tony
2026-09-26 01:29:48 +08:00
committed by GitHub
parent 372cca9932
commit 896cf2b4a6
2 changed files with 148 additions and 689 deletions
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lib/routes/bilibili/manga-update.ts
+148 -28
View File
@@ -1,5 +1,6 @@
import { createDecipheriv } from 'node:crypto';
import type { Route } from '@/types';
import cache from '@/utils/cache';
import got from '@/utils/got';
export const route: Route = {
@@ -25,56 +26,175 @@ export const route: Route = {
handler,
};
// Based on https://github.com/SocialSisterYi/bilibili-API-collect/issues/1168#issuecomment-2620749895
async function genReqSign(query, body) {
// Don't import on top-level to avoid a cyclic dependency - wasm-exec.js generated via `pnpm build`, which in turn needs wasm-exec.js to import routes correctly
const { Go } = await import('./wasm-exec');
const ALPHA62 = 'br5NH9CxpvJzmEt3OqoF7jgWMIZ2UnASfc8K6XaLYylT1eVBGh4sdQkDwRP0ui';
const B64_TABLES = ['UalVqQk8T7+5oJxC6MzIniWDrc3XERGN/wdLyp90mf2tHuvsgeSjZbBF1KAOPhY4', 'zI3XZb8T7+5opF1KJxUaBqQk90mf6MlVCEceSjAOPhY42RGN/wdLytHuvsgniWDr'];
const rotateLeft = (x: number, n: number) => ((x << n) | (x >>> (32 - n))) >>> 0;
// Cache the wasm binary as it's quite large (~2MB)
// Here the binary is saved as base64 as the cache stores strings
const wasmBufferBase64 = await cache.tryGet('bilibili-manga-wasm-20250208', async () => {
const wasmResp = await got('https://s1.hdslb.com/bfs/manga-static/manga-pc/6732b1bf426cfc634293.wasm', {
responseType: 'arrayBuffer',
});
return Buffer.from(wasmResp.data).toString('base64');
});
const wasmBuffer = Buffer.from(wasmBufferBase64, 'base64');
const go = new Go();
const { instance } = await WebAssembly.instantiate(wasmBuffer, go.importObject);
go.run(instance);
if (void 0 === globalThis.genReqSign) {
throw new Error('WASM function not available');
/**
* MD5-shaped block mixer with its own round function and rotation constants
*/
const processBlock = (block: Uint8Array, [a, b, c, d]: number[]) => {
for (let i = 0; i < 16; i++) {
const w = block[i * 4] | (block[i * 4 + 1] << 8) | (block[i * 4 + 2] << 16) | (block[i * 4 + 3] << 24);
a = (a + ((b & c) | (~b & d)) + w) >>> 0;
b = (b + (c ^ a ^ d) + w) >>> 0;
c = (c + ((b & a) | (~b & d)) + w) >>> 0;
d = (d + (c ^ a ^ b) + w) >>> 0;
a = rotateLeft(a, 5);
b = rotateLeft(b, 7);
c = rotateLeft(c, 3);
d = rotateLeft(d, 11);
}
return [a, b, c, d];
};
const signature = globalThis.genReqSign(query, body, Date.now());
/**
* Same as MD5 padding except a length of 55 mod 64 gets a full extra block
*/
const md5v2 = (data: Uint8Array) => {
const zeros = 64 - ((data.length + 9) % 64);
const buf = Buffer.alloc(data.length + 1 + zeros + 8);
buf.set(data);
buf[data.length] = 0x80;
buf.writeBigUInt64LE(BigInt(data.length) * 8n, buf.length - 8);
let state = [0xab_cd_ef_01, 0x12_34_56_78, 0xde_ad_be_ef, 0xfe_ed_ca_fe];
for (let i = 0; i < buf.length; i += 64) {
state = processBlock(buf.subarray(i, i + 64), state);
}
const hex = state.map((w) => w.toString(16).padStart(8, '0')).join('');
return Buffer.from([...hex].map((ch) => ALPHA62.codePointAt(ch.codePointAt(0)! % 62)!));
};
return signature.sign;
}
/**
* RC4 with `S[i] ^= i` after each KSA swap and a +1 offset on the keystream index
*/
const xrc4 = (key: number[], data: Uint8Array) => {
const S = Uint8Array.from({ length: 256 }, (_, i) => i);
for (let i = 0, j = 0; i < 256; i++) {
j = (j + S[i] + key[i % key.length]) & 255;
[S[i], S[j]] = [S[j], S[i]];
S[i] ^= i;
}
const out = Buffer.alloc(data.length);
for (let n = 0, i = 0, j = 0; n < data.length; n++) {
i = (i + 1) & 255;
j = (j + S[i]) & 255;
[S[i], S[j]] = [S[j], S[i]];
out[n] = data[n] ^ S[(S[i] + S[j] + 1) & 255];
}
return out;
};
const b64V2Enc = (data: Uint8Array, variant: number) => {
const table = B64_TABLES[variant];
let out = '';
for (let i = 0; i < data.length; i += 3) {
const v = (data[i] << 16) | ((data[i + 1] ?? 0) << 8) | (data[i + 2] ?? 0);
for (let k = 0; k < 4; k++) {
out += table[(v >>> (18 - 6 * k)) & 63];
}
}
const rem = data.length % 3;
return rem ? out + '='.repeat(3 - rem) : out;
};
// Based on https://github.com/SocialSisterYi/bilibili-API-collect/issues/1168#issuecomment-2620749895
// https://s1.hdslb.com/bfs/manga-static/manga-pc/6732b1bf426cfc634293.wasm
export const genReqSign = (query: string, body: string, ts: number) => {
const params = new URLSearchParams(query);
const keys = [...new Set(params.keys())].filter((k) => k !== 'ultra_sign').toSorted((a, b) => Number(a > b) - Number(a < b));
const acc = keys.map((k) => k + params.getAll(k).join('')).join('');
const bts = BigInt(ts);
const h1 = md5v2(Buffer.from(acc + bts.toString(16)));
const h2 = md5v2(Buffer.from(body + (bts / 128n).toString(2)));
const encBody = b64V2Enc(xrc4([1, 3, 7], Buffer.from(body)), Number(bts % 2n));
const h3 = md5v2(Buffer.from(encBody));
const t = Number(bts & 0xff_ff_ff_ffn);
const buf = Buffer.from([
1,
Number((bts >> 23n) & 0xffn),
Number((bts >> 31n) & 0xffn),
Number((bts >> 15n) & 0xffn),
7,
h1[13],
h1[23],
h2[11],
h2[7],
h3[23],
h3[19],
(t >>> 8) & 255,
(t >>> 24) & 255,
(t >>> 16) & 255,
7,
0,
5,
0,
4,
1,
5,
0,
2,
0,
1,
0,
6,
2,
0,
0,
]);
// oxlint-disable-next-line unicorn/no-array-reduce
buf[29] = buf.subarray(0, 28).reduce((x, y) => x ^ y, 0);
const out = Buffer.from([buf[0], buf[1], 0, 0, 0, ...[22, 7, 17, 21, 16, 28, 15, 12, 4, 3, 14, 27, 10, 6, 11, 19, 24, 25, 26, 20, 23, 18, 8, 2].map((i) => buf[i])]);
const hA = md5v2(Buffer.concat([out, Buffer.from([h1[7], h2[29]])]));
const hB = md5v2(Buffer.concat([out, Buffer.from([h3[31]])]));
const sign = Buffer.concat([hA.subarray(0, 24), hB.subarray(0, 24)]);
// The 11 hex digits of the timestamp are spliced into fixed positions of the digest
const hex = bts.toString(16);
for (const [pos, i] of [41, 37, 23, 29, 13, 19, 5, 47, 7, 11, 17].entries()) {
sign[i] = hex.codePointAt(pos)!;
}
return sign.toString('latin1');
};
const decryptBytesData = (bytesData: string, buvid3: string, comicId: string) => {
const key = Buffer.from(
[...buvid3]
.filter((_, i) => i % 2 === 0)
.join('')
.slice(0, 18) +
'web' +
comicId.slice(-3)
);
const decipher = createDecipheriv('aes-192-cbc', key, key.subarray(0, 16));
const plain = Buffer.concat([decipher.update(Buffer.from(bytesData, 'base64')), decipher.final()]);
return JSON.parse(plain.toString());
};
async function handler(ctx) {
const comic_id = ctx.req.param('comicid').startsWith('mc') ? ctx.req.param('comicid').replace('mc', '') : ctx.req.param('comicid');
const link = `https://manga.bilibili.com/detail/mc${comic_id}`;
const spi_response = await got('https://api.bilibili.com/x/frontend/finger/spi');
const buvid3 = spi_response.data.data.b_3;
const query = 'device=pc&platform=web&nov=25';
const query = 'device=pc&platform=web&nov=27&a=810';
const body = JSON.stringify({
comic_id: Number(comic_id),
});
const ultraSign = await genReqSign(query, body);
const ultraSign = genReqSign(query, body, Date.now());
const response = await got({
method: 'POST',
url: `https://manga.bilibili.com/twirp/comic.v2.Comic/ComicDetail?${query}&ultra_sign=${ultraSign}`,
url: `https://manga.bilibili.com/twirp/comic.v1.Comic/ComicDetail?${query}&ultra_sign=${ultraSign}`,
body,
headers: {
Referer: link,
Cookie: `buvid3=${spi_response.data.data.b_3}; buvid4=${spi_response.data.data.b_4}`,
Cookie: `buvid3=${buvid3}; buvid4=${spi_response.data.data.b_4}`,
'x-bili-data-sn': '1E74C20E5720FBF3BB351965D7A9DFC1',
},
});
const data = response.data.data;
const data = decryptBytesData(response.data.bytesData, buvid3, comic_id);
const author = data.author_name.join(', ');
return {
lib/routes/bilibili/wasm-exec.ts
-661
View File
@@ -1,661 +0,0 @@
// @ts-nocheck https://github.com/golang/go/blob/master/lib/wasm/wasm_exec.js
// oxlint-disable unicorn/prefer-math-trunc
// oxlint-disable unicorn-js/no-this-outside-of-class
// oxlint-disable unicorn-js/no-array-from-fill
// oxlint-disable unicorn-js/no-global-object-property-assignment
// oxlint-disable unicorn-js/no-unnecessary-global-this
// oxlint-disable unicorn-js/no-undeclared-class-members
// oxlint-disable unicorn-js/prefer-array-from-map
// oxlint-disable unicorn-js/require-array-sort-compare
// oxlint-disable unicorn-js/prefer-short-arrow-method
// oxlint-disable unicorn-js/prefer-block-statement-over-iife
// oxlint-disable no-unused-vars
// oxlint-disable unicorn/consistent-function-scoping
/* eslint-disable prefer-rest-params */
/* eslint-disable default-case */
/* eslint-disable no-console */
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
'use strict';
(() => {
const enosys = () => {
const err = new Error('not implemented');
err.code = 'ENOSYS';
return err;
};
if (!globalThis.fs) {
let outputBuf = '';
globalThis.fs = {
constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1, O_DIRECTORY: -1 }, // unused
writeSync(fd, buf) {
outputBuf += decoder.decode(buf);
const nl = outputBuf.lastIndexOf('\n');
if (nl !== -1) {
console.log(outputBuf.slice(0, nl));
outputBuf = outputBuf.slice(nl + 1);
}
return buf.length;
},
write(fd, buf, offset, length, position, callback) {
if (offset !== 0 || length !== buf.length || position !== null) {
callback(enosys());
return;
}
const n = this.writeSync(fd, buf);
callback(null, n);
},
chmod(path, mode, callback) {
callback(enosys());
},
chown(path, uid, gid, callback) {
callback(enosys());
},
close(fd, callback) {
callback(enosys());
},
fchmod(fd, mode, callback) {
callback(enosys());
},
fchown(fd, uid, gid, callback) {
callback(enosys());
},
fstat(fd, callback) {
callback(enosys());
},
fsync(fd, callback) {
callback(null);
},
ftruncate(fd, length, callback) {
callback(enosys());
},
lchown(path, uid, gid, callback) {
callback(enosys());
},
link(path, link, callback) {
callback(enosys());
},
lstat(path, callback) {
callback(enosys());
},
mkdir(path, perm, callback) {
callback(enosys());
},
open(path, flags, mode, callback) {
callback(enosys());
},
read(fd, buffer, offset, length, position, callback) {
callback(enosys());
},
readdir(path, callback) {
callback(enosys());
},
readlink(path, callback) {
callback(enosys());
},
rename(from, to, callback) {
callback(enosys());
},
rmdir(path, callback) {
callback(enosys());
},
stat(path, callback) {
callback(enosys());
},
symlink(path, link, callback) {
callback(enosys());
},
truncate(path, length, callback) {
callback(enosys());
},
unlink(path, callback) {
callback(enosys());
},
utimes(path, atime, mtime, callback) {
callback(enosys());
},
};
}
if (!globalThis.process) {
globalThis.process = {
getuid() {
return -1;
},
getgid() {
return -1;
},
geteuid() {
return -1;
},
getegid() {
return -1;
},
getgroups() {
throw enosys();
},
pid: -1,
ppid: -1,
umask() {
throw enosys();
},
cwd() {
throw enosys();
},
chdir() {
throw enosys();
},
};
}
if (!globalThis.path) {
globalThis.path = {
resolve(...pathSegments) {
return pathSegments.join('/');
},
};
}
if (!globalThis.crypto) {
throw new Error('globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)');
}
if (!globalThis.performance) {
throw new Error('globalThis.performance is not available, polyfill required (performance.now only)');
}
if (!globalThis.TextEncoder) {
throw new Error('globalThis.TextEncoder is not available, polyfill required');
}
if (!globalThis.TextDecoder) {
throw new Error('globalThis.TextDecoder is not available, polyfill required');
}
const encoder = new TextEncoder();
const decoder = new TextDecoder('utf-8');
globalThis.Go = class {
constructor() {
this.argv = ['js'];
this.env = {};
this.exit = (code) => {
if (code !== 0) {
console.warn('exit code:', code);
}
};
this._exitPromise = new Promise((resolve) => {
this._resolveExitPromise = resolve;
});
this._pendingEvent = null;
this._scheduledTimeouts = new Map();
this._nextCallbackTimeoutID = 1;
const setInt64 = (addr, v) => {
this.mem.setUint32(addr + 0, v, true);
this.mem.setUint32(addr + 4, Math.floor(v / 4_294_967_296), true);
};
const getInt64 = (addr) => {
const low = this.mem.getUint32(addr + 0, true);
const high = this.mem.getInt32(addr + 4, true);
return low + high * 4_294_967_296;
};
const loadValue = (addr) => {
const f = this.mem.getFloat64(addr, true);
if (f === 0) {
return;
}
if (!Number.isNaN(f)) {
return f;
}
const id = this.mem.getUint32(addr, true);
return this._values[id];
};
const storeValue = (addr, v) => {
const nanHead = 0x7f_f8_00_00;
if (typeof v === 'number' && v !== 0) {
if (Number.isNaN(v)) {
this.mem.setUint32(addr + 4, nanHead, true);
this.mem.setUint32(addr, 0, true);
return;
}
this.mem.setFloat64(addr, v, true);
return;
}
if (v === undefined) {
this.mem.setFloat64(addr, 0, true);
return;
}
let id = this._ids.get(v);
if (id === undefined) {
id = this._idPool.pop();
if (id === undefined) {
id = this._values.length;
}
this._values[id] = v;
this._goRefCounts[id] = 0;
this._ids.set(v, id);
}
this._goRefCounts[id]++;
let typeFlag = 0;
switch (typeof v) {
case 'object':
if (v !== null) {
typeFlag = 1;
}
break;
case 'string':
typeFlag = 2;
break;
case 'symbol':
typeFlag = 3;
break;
case 'function':
typeFlag = 4;
break;
}
this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
this.mem.setUint32(addr, id, true);
};
const loadSlice = (addr) => {
const array = getInt64(addr + 0);
const len = getInt64(addr + 8);
return new Uint8Array(this._inst.exports.mem.buffer, array, len);
};
const loadSliceOfValues = (addr) => {
const array = getInt64(addr + 0);
const len = getInt64(addr + 8);
const a = Array.from({ length: len });
for (let i = 0; i < len; i++) {
a[i] = loadValue(array + i * 8);
}
return a;
};
const loadString = (addr) => {
const saddr = getInt64(addr + 0);
const len = getInt64(addr + 8);
return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
};
const testCallExport = (a, b) => {
this._inst.exports.testExport0();
return this._inst.exports.testExport(a, b);
};
const timeOrigin = Date.now() - performance.now();
this.importObject = {
_gotest: {
add: (a, b) => a + b,
callExport: testCallExport,
},
gojs: {
// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
// This changes the SP, thus we have to update the SP used by the imported function.
// func wasmExit(code int32)
'runtime.wasmExit': (sp) => {
sp >>>= 0;
const code = this.mem.getInt32(sp + 8, true);
this.exited = true;
delete this._inst;
delete this._values;
delete this._goRefCounts;
delete this._ids;
delete this._idPool;
this.exit(code);
},
// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
'runtime.wasmWrite': (sp) => {
sp >>>= 0;
const fd = getInt64(sp + 8);
const p = getInt64(sp + 16);
const n = this.mem.getInt32(sp + 24, true);
globalThis.fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
},
// func resetMemoryDataView()
'runtime.resetMemoryDataView': (sp) => {
// eslint-disable-next-line @typescript-eslint/no-unused-vars, no-useless-assignment
sp >>>= 0;
this.mem = new DataView(this._inst.exports.mem.buffer);
},
// func nanotime1() int64
'runtime.nanotime1': (sp) => {
sp >>>= 0;
setInt64(sp + 8, (timeOrigin + performance.now()) * 1_000_000);
},
// func walltime() (sec int64, nsec int32)
'runtime.walltime': (sp) => {
sp >>>= 0;
const msec = Date.now();
setInt64(sp + 8, msec / 1000);
this.mem.setInt32(sp + 16, (msec % 1000) * 1_000_000, true);
},
// func scheduleTimeoutEvent(delay int64) int32
'runtime.scheduleTimeoutEvent': (sp) => {
sp >>>= 0;
const id = this._nextCallbackTimeoutID;
this._nextCallbackTimeoutID++;
this._scheduledTimeouts.set(
id,
setTimeout(
() => {
this._resume();
while (this._scheduledTimeouts.has(id)) {
// for some reason Go failed to register the timeout event, log and try again
// (temporary workaround for https://github.com/golang/go/issues/28975)
console.warn('scheduleTimeoutEvent: missed timeout event');
this._resume();
}
},
getInt64(sp + 8)
)
);
this.mem.setInt32(sp + 16, id, true);
},
// func clearTimeoutEvent(id int32)
'runtime.clearTimeoutEvent': (sp) => {
sp >>>= 0;
const id = this.mem.getInt32(sp + 8, true);
clearTimeout(this._scheduledTimeouts.get(id));
this._scheduledTimeouts.delete(id);
},
// func getRandomData(r []byte)
'runtime.getRandomData': (sp) => {
sp >>>= 0;
crypto.getRandomValues(loadSlice(sp + 8));
},
// func finalizeRef(v ref)
'syscall/js.finalizeRef': (sp) => {
sp >>>= 0;
const id = this.mem.getUint32(sp + 8, true);
this._goRefCounts[id]--;
if (this._goRefCounts[id] !== 0) {
return;
}
const v = this._values[id];
this._values[id] = null;
this._ids.delete(v);
this._idPool.push(id);
},
// func stringVal(value string) ref
'syscall/js.stringVal': (sp) => {
sp >>>= 0;
storeValue(sp + 24, loadString(sp + 8));
},
// func valueGet(v ref, p string) ref
'syscall/js.valueGet': (sp) => {
sp >>>= 0;
const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 32, result);
},
// func valueSet(v ref, p string, x ref)
'syscall/js.valueSet': (sp) => {
sp >>>= 0;
Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
},
// func valueDelete(v ref, p string)
'syscall/js.valueDelete': (sp) => {
sp >>>= 0;
Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
},
// func valueIndex(v ref, i int) ref
'syscall/js.valueIndex': (sp) => {
sp >>>= 0;
storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
},
// valueSetIndex(v ref, i int, x ref)
'syscall/js.valueSetIndex': (sp) => {
sp >>>= 0;
Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
},
// func valueCall(v ref, m string, args []ref) (ref, bool)
'syscall/js.valueCall': (sp) => {
sp >>>= 0;
try {
const v = loadValue(sp + 8);
const m = Reflect.get(v, loadString(sp + 16));
const args = loadSliceOfValues(sp + 32);
const result = Reflect.apply(m, v, args);
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 56, result);
this.mem.setUint8(sp + 64, 1);
} catch (error) {
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 56, error);
this.mem.setUint8(sp + 64, 0);
}
},
// func valueInvoke(v ref, args []ref) (ref, bool)
'syscall/js.valueInvoke': (sp) => {
sp >>>= 0;
try {
const v = loadValue(sp + 8);
const args = loadSliceOfValues(sp + 16);
const result = Reflect.apply(v, undefined, args);
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, result);
this.mem.setUint8(sp + 48, 1);
} catch (error) {
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, error);
this.mem.setUint8(sp + 48, 0);
}
},
// func valueNew(v ref, args []ref) (ref, bool)
'syscall/js.valueNew': (sp) => {
sp >>>= 0;
try {
const v = loadValue(sp + 8);
const args = loadSliceOfValues(sp + 16);
const result = Reflect.construct(v, args);
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, result);
this.mem.setUint8(sp + 48, 1);
} catch (error) {
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, error);
this.mem.setUint8(sp + 48, 0);
}
},
// func valueLength(v ref) int
'syscall/js.valueLength': (sp) => {
sp >>>= 0;
setInt64(sp + 16, Number.parseInt(loadValue(sp + 8).length));
},
// valuePrepareString(v ref) (ref, int)
'syscall/js.valuePrepareString': (sp) => {
sp >>>= 0;
const str = encoder.encode(String(loadValue(sp + 8)));
storeValue(sp + 16, str);
setInt64(sp + 24, str.length);
},
// valueLoadString(v ref, b []byte)
'syscall/js.valueLoadString': (sp) => {
sp >>>= 0;
const str = loadValue(sp + 8);
loadSlice(sp + 16).set(str);
},
// func valueInstanceOf(v ref, t ref) bool
'syscall/js.valueInstanceOf': (sp) => {
sp >>>= 0;
this.mem.setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16) ? 1 : 0);
},
// func copyBytesToGo(dst []byte, src ref) (int, bool)
'syscall/js.copyBytesToGo': (sp) => {
sp >>>= 0;
const dst = loadSlice(sp + 8);
const src = loadValue(sp + 32);
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
this.mem.setUint8(sp + 48, 0);
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
setInt64(sp + 40, toCopy.length);
this.mem.setUint8(sp + 48, 1);
},
// func copyBytesToJS(dst ref, src []byte) (int, bool)
'syscall/js.copyBytesToJS': (sp) => {
sp >>>= 0;
const dst = loadValue(sp + 8);
const src = loadSlice(sp + 16);
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
this.mem.setUint8(sp + 48, 0);
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
setInt64(sp + 40, toCopy.length);
this.mem.setUint8(sp + 48, 1);
},
debug: (value) => {
console.log(value);
},
},
};
}
async run(instance) {
if (!(instance instanceof WebAssembly.Instance)) {
throw new TypeError('Go.run: WebAssembly.Instance expected');
}
this._inst = instance;
this.mem = new DataView(this._inst.exports.mem.buffer);
this._values = [
// JS values that Go currently has references to, indexed by reference id
NaN,
0,
null,
true,
false,
globalThis,
this,
];
this._goRefCounts = Array.from({ length: this._values.length }).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
this._ids = new Map([
// mapping from JS values to reference ids
[0, 1],
[null, 2],
[true, 3],
[false, 4],
[globalThis, 5],
[this, 6],
]);
this._idPool = []; // unused ids that have been garbage collected
this.exited = false; // whether the Go program has exited
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
let offset = 4096;
const strPtr = (str) => {
const ptr = offset;
const bytes = encoder.encode(str + '\0');
new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
offset += bytes.length;
if (offset % 8 !== 0) {
offset += 8 - (offset % 8);
}
return ptr;
};
const argc = this.argv.length;
const argvPtrs: number[] = [];
for (const arg of this.argv) {
argvPtrs.push(strPtr(arg));
}
argvPtrs.push(0);
const keys = Object.keys(this.env).toSorted();
for (const key of keys) {
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
}
argvPtrs.push(0);
const argv = offset;
for (const ptr of argvPtrs) {
this.mem.setUint32(offset, ptr, true);
this.mem.setUint32(offset + 4, 0, true);
offset += 8;
}
// The linker guarantees global data starts from at least wasmMinDataAddr.
// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
const wasmMinDataAddr = 4096 + 8192;
if (offset >= wasmMinDataAddr) {
throw new Error('total length of command line and environment variables exceeds limit');
}
this._inst.exports.run(argc, argv);
if (this.exited) {
this._resolveExitPromise();
}
await this._exitPromise;
}
_resume() {
if (this.exited) {
throw new Error('Go program has already exited');
}
this._inst.exports.resume();
if (this.exited) {
this._resolveExitPromise();
}
}
_makeFuncWrapper(id) {
// somehow avoiding aliasing this with an arrow function doesn't work
// oxlint-disable-next-line unicorn/no-this-assignment typescript/no-this-alias
const go = this;
return function () {
const event = { id, this: this, args: arguments };
go._pendingEvent = event;
go._resume();
return event.result;
};
}
};
})();
export const Go = globalThis.Go;