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manifest.ts
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manifest.ts
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import type {
Manifest,
ManifestWasmUrl,
ManifestWasmData,
ManifestWasmPath,
ManifestWasmResponse,
ManifestWasmModule,
ManifestLike,
PluginConfigLike,
} from './interfaces.ts';
import { readFile } from './polyfills/node-fs.ts';
import { responseToModule } from './polyfills/response-to-module.ts';
export type ManifestOptions = {
allowedPaths?: { [key: string]: string } | undefined;
allowedHosts?: string[] | undefined;
config?: PluginConfigLike;
};
async function _populateWasmField(candidate: ManifestLike, _fetch: typeof fetch): Promise<ManifestLike> {
if (candidate instanceof ArrayBuffer) {
return { wasm: [{ data: new Uint8Array(candidate as ArrayBuffer) }] };
}
if (candidate instanceof WebAssembly.Module) {
return { wasm: [{ module: candidate as WebAssembly.Module }] };
}
if (typeof candidate === 'string') {
if (candidate.search(/^\s*\{/g) === 0) {
return JSON.parse(candidate);
}
if (candidate.search(/^(https?|file):\/\//) !== 0) {
return { wasm: [{ path: candidate }] };
}
candidate = new URL(candidate);
}
if (candidate instanceof Response || candidate?.constructor?.name === 'Response') {
const response: Response = candidate as Response;
const contentType = response.headers.get('content-type') || 'application/octet-stream';
switch (contentType.split(';')[0]) {
case 'application/octet-stream':
case 'application/wasm':
return { wasm: [{ response }] };
case 'application/json':
case 'text/json':
return _populateWasmField(JSON.parse(await response.text()), _fetch);
default:
throw new TypeError(
`While processing manifest URL "${response.url}"; expected content-type of "text/json", "application/json", "application/octet-stream", or "application/wasm"; got "${contentType}" after stripping off charset.`,
);
}
}
if (candidate instanceof URL) {
return _populateWasmField(await _fetch(candidate, { redirect: 'follow' }), _fetch);
}
if (!('wasm' in candidate)) {
throw new TypeError('Expected "wasm" key in manifest');
}
if (!Array.isArray(candidate.wasm)) {
throw new TypeError('Expected "manifest.wasm" to be array');
}
const badItemIdx = candidate.wasm.findIndex(
(item) =>
!('data' in item) && !('url' in item) && !('path' in item) && !('module' in item) && !('response' in item),
);
if (badItemIdx > -1) {
throw new TypeError(
`Expected every item in "manifest.wasm" to include either a "data", "url", or "path" key; got bad item at index ${badItemIdx}`,
);
}
return { ...(candidate as Manifest) };
}
async function intoManifest(candidate: ManifestLike, _fetch: typeof fetch = fetch): Promise<Manifest> {
const manifest = (await _populateWasmField(candidate, _fetch)) as Manifest;
manifest.config ??= {};
return manifest;
}
export async function toWasmModuleData(
input: ManifestLike,
_fetch: typeof fetch,
): Promise<[ManifestOptions, string[], WebAssembly.Module[]]> {
const names: string[] = [];
const manifest = await intoManifest(input, _fetch);
const manifestOpts : ManifestOptions = {
allowedPaths: manifest.allowedPaths,
allowedHosts: manifest.allowedHosts,
config: manifest.config,
};
const manifestsWasm = await Promise.all(
manifest.wasm.map(async (item, idx, all) => {
let module: WebAssembly.Module;
let buffer: ArrayBuffer | undefined;
if ((item as ManifestWasmData).data) {
const data = (item as ManifestWasmData).data;
buffer = data.buffer ? data.buffer : data;
module = await WebAssembly.compile(data);
} else if ((item as ManifestWasmPath).path) {
const path = (item as ManifestWasmPath).path;
const data = await readFile(path);
buffer = data.buffer as ArrayBuffer;
module = await WebAssembly.compile(data);
} else if ((item as ManifestWasmUrl).url) {
const response = await _fetch((item as ManifestWasmUrl).url, {
headers: {
accept: 'application/wasm;q=0.9,application/octet-stream;q=0.8',
'user-agent': 'extism',
},
});
const result = await responseToModule(response, Boolean(item.hash));
buffer = result.data;
module = result.module;
} else if ((item as ManifestWasmResponse).response) {
const result = await responseToModule((item as ManifestWasmResponse).response, Boolean(item.hash));
buffer = result.data;
module = result.module;
} else if ((item as ManifestWasmModule).module) {
(<any>names[idx]) = item.name ?? String(idx);
module = (item as ManifestWasmModule).module;
} else {
throw new Error(
`Unrecognized wasm item at index ${idx}. Keys include: "${Object.keys(item).sort().join(',')}"`,
);
}
let potentialName = String(idx);
if (item.hash) {
if (!buffer) {
throw new Error('Item specified a hash but WebAssembly.Module source data is unavailable for hashing');
}
const hashBuffer = new Uint8Array(await crypto.subtle.digest('SHA-256', buffer));
const checkBuffer = new Uint8Array(32);
let eq = true;
for (let i = 0; i < 32; ++i) {
checkBuffer[i] = parseInt(item.hash.slice(i << 1, (i << 1) + 2), 16);
// do not exit early: we want to do a constant time comparison
eq = eq && checkBuffer[i] === hashBuffer[i];
}
const hashAsString = () => [...hashBuffer].map((xs) => xs.toString(16).padStart(2, '0')).join('');
if (!eq) {
throw new Error(`Plugin error: hash mismatch. Expected: ${item.hash}. Actual: ${hashAsString()}`);
}
potentialName = hashAsString();
}
(<any>names[idx]) = item.name ?? (idx === all.length - 1 ? 'main' : potentialName);
return module;
}),
);
if (!names.includes('main')) {
throw new Error('manifest with multiple modules must designate one "main" module');
}
return [manifestOpts, names, manifestsWasm];
}