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/**
* Untrusted Script Event Handler Loader (QuickJS)
*
* Executes handler code in isolated QuickJS environment for security.
*/
import {
newQuickJSWASMModuleFromVariant,
QuickJSContext,
QuickJSHandle,
QuickJSRuntime,
shouldInterruptAfterDeadline,
} from "quickjs-emscripten-core";
import quickJSVariant from "#my-quickjs-variant";
import uuid from "uuid/v4";
import type {
FileReaderFn,
ScriptEventHandlerWithCleanup,
} from "lib/scriptEventsHandlers/handlerTypes";
import {
detectModuleSystem,
createMockRequire,
validateHandlerMetadata,
createHandlerBase,
finalizeHandler,
noReadFileFn,
convertESMToCommonJS,
} from "./handlerCommon";
export const QuickJS = newQuickJSWASMModuleFromVariant(quickJSVariant);
const TIMEOUT_MS = 60000;
/**
* Proxy factory for creating lazy proxies in the VM
*/
const PROXY_FACTORY_SRC = `
(function(moduleName, invoker, proxyFactory) {
const handler = {
get(_t, prop) {
if (prop === Symbol.iterator) {
const isArray = invoker(moduleName, '__IS_ARRAY__', []);
if (isArray) {
return function* () {
const keys = invoker(moduleName, '__KEYS__', []);
if (Array.isArray(keys)) {
for (let i = 0; i < keys.length; i++) {
yield invoker(moduleName, String(i), []);
}
}
};
}
return undefined;
}
const value = invoker(moduleName, String(prop), []);
if (value && typeof value === 'object' && value.__PROXY_MARKER__) {
return proxyFactory(value.__PROXY_MARKER__, invoker, proxyFactory);
}
if (typeof value === 'function') {
return (...args) => invoker(moduleName, String(prop), ['__CALL__', ...args]);
}
return value;
},
set(_t, prop, value) {
invoker(moduleName, String(prop), ['__SET__', value]);
return true;
},
ownKeys(_t) {
const keys = invoker(moduleName, '__KEYS__', []);
return Array.isArray(keys) ? keys : [];
},
has(_t, prop) {
const result = invoker(moduleName, '__HAS__', [String(prop)]);
return !!result;
},
getOwnPropertyDescriptor(_t, prop) {
const exists = invoker(moduleName, '__HAS__', [String(prop)]);
if (exists) {
return {
enumerable: true,
configurable: true,
writable: true,
value: this.get(_t, prop)
};
}
return undefined;
},
apply(_t, _thisArg, argArray) {
return invoker(moduleName, '', ['__CALL__', ...argArray]);
}
};
const hostObjType = invoker(moduleName, '__GET_TYPE__', []);
const isArray = invoker(moduleName, '__IS_ARRAY__', []);
const target = (hostObjType === 'function') ? function(){} : (isArray ? [] : {});
return new Proxy(target, handler);
})
`;
/**
* Creates invoke handler for proxy system
*/
const createOnInvokeHandler = (
hostRegistry: Map<string, unknown>,
createProxy: (value: unknown) => { proxyId: string; needsProxy: boolean },
): ((module: string, path: string, args: unknown[]) => unknown) => {
return (module: string, path: string, args: unknown[]) => {
const hostObj = hostRegistry.get(module);
Iif (!hostObj) {
throw new Error(`Module ${module} not found in host registry`);
}
if (path === "__GET_TYPE__") {
return typeof hostObj;
}
if (path === "__IS_ARRAY__") {
return Array.isArray(hostObj);
}
if (path === "__KEYS__") {
Iif (Array.isArray(hostObj)) {
return hostObj.map((_, i) => String(i));
}
return Object.keys(hostObj as object);
}
if (path === "__HAS__") {
const [prop] = args;
return Object.prototype.hasOwnProperty.call(hostObj, String(prop));
}
if (args.length > 0 && args[0] === "__SET__") {
const [, value] = args;
if (hostObj && typeof hostObj === "object") {
const existingValue = (hostObj as Record<string, unknown>)[path];
// Prevent replacing functions
if (typeof existingValue === "function") {
return undefined;
}
(hostObj as Record<string, unknown>)[path] = value;
return undefined;
}
return undefined;
}
if (args.length > 0 && args[0] === "__CALL__") {
const [, ...callArgs] = args;
Iif (typeof hostObj === "function") {
return (hostObj as Function)(...callArgs);
}
const prop = (hostObj as Record<string, unknown>)[path];
if (typeof prop === "function") {
if (Array.isArray(hostObj)) {
return (prop as Function).call(hostObj, ...callArgs);
}
return (prop as Function).call(hostObj, ...callArgs);
}
throw new Error(`Property ${path} is not a function`);
}
// Regular property access
if (hostObj && typeof hostObj === "object") {
const value = (hostObj as Record<string, unknown>)[path];
if (value !== null && value !== undefined && typeof value === "object") {
const { proxyId, needsProxy } = createProxy(value);
if (needsProxy) {
return { __PROXY_MARKER__: proxyId };
}
}
return value;
}
return undefined;
};
};
/**
* Creates host invoke function for the proxy system
*/
const createHostInvokeFn = (
vm: QuickJSContext,
onInvoke: (module: string, path: string, args: unknown[]) => unknown,
jsValueToHandle: (val: unknown, useProxies: boolean) => QuickJSHandle,
handleToJsValue: (handle: QuickJSHandle) => unknown,
vmHandleRegistry: Map<string, QuickJSHandle>,
) => {
return vm.newFunction("hostInvoke", (moduleH, pathH, argsH) => {
const module = vm.getString(moduleH);
const path = vm.getString(pathH);
const argsType = vm.typeof(argsH);
let args: unknown[];
if (argsType === "object" && argsH !== vm.null) {
const lengthProp = vm.getProp(argsH, "length");
const length = vm.getNumber(lengthProp);
lengthProp.dispose();
args = [];
for (let i = 0; i < length; i++) {
const elementHandle = vm.getProp(argsH, String(i));
const elementType = vm.typeof(elementHandle);
if (elementType === "function") {
const funcId = `arg_func_${Date.now()}_${i}_${Math.random()}`;
vmHandleRegistry.set(funcId, elementHandle);
args[i] = (...callArgs: unknown[]) => {
const storedHandle = vmHandleRegistry.get(funcId);
Iif (!storedHandle) {
throw new Error(`Function handle ${funcId} not found`);
}
const argHandles = callArgs.map((arg) =>
jsValueToHandle(arg, true),
);
try {
const result = vm.callFunction(
storedHandle,
vm.undefined,
...argHandles,
);
if (result.error) {
const error = vm.dump(result.error);
result.error.dispose();
throw new Error(
`Callback function failed: ${JSON.stringify(error)}`,
);
}
const returnValue = vm.dump(result.value);
result.value.dispose();
return returnValue;
} finally {
argHandles.forEach((h) => h.dispose());
}
};
} else {
const elementType = vm.typeof(elementHandle);
if (elementType === "object" && elementHandle !== vm.null) {
args[i] = handleToJsValue(elementHandle);
} else {
args[i] = vm.dump(elementHandle);
}
elementHandle.dispose();
}
}
} else E{
args = [vm.dump(argsH)];
}
const result = onInvoke(module, path, args);
// Convert result back to VM handle
if (result === null) return vm.null;
if (result === undefined) return vm.undefined;
if (typeof result === "boolean") return result ? vm.true : vm.false;
if (typeof result === "number") return vm.newNumber(result);
if (typeof result === "string") return vm.newString(result);
if (typeof result === "object" || typeof result === "function") {
// Check if this is a proxy marker - if so, return it as-is so the VM can handle it
if (
result &&
typeof result === "object" &&
"__PROXY_MARKER__" in result &&
Object.keys(result).length === 1
) {
const markerObj = vm.newObject();
const proxyIdHandle = vm.newString(
(result as { __PROXY_MARKER__: string }).__PROXY_MARKER__,
);
vm.setProp(markerObj, "__PROXY_MARKER__", proxyIdHandle);
proxyIdHandle.dispose();
return markerObj;
}
return jsValueToHandle(result, false);
}
return vm.undefined;
});
};
/**
* Persistent VM wrapper maintaining QuickJS context across function calls.
*/
class PersistentVM {
private vm: QuickJSContext;
private runtime: QuickJSRuntime;
private moduleExports: QuickJSHandle | null = null;
private hostFunctionRegistry = new Map<string, unknown>();
private vmHandleRegistry = new Map<string, QuickJSHandle>();
private proxyFactory: QuickJSHandle;
private hostInvokeFn: QuickJSHandle;
private onInvokeHandler: (
module: string,
path: string,
args: unknown[],
) => unknown;
constructor(vm: QuickJSContext, runtime: QuickJSRuntime) {
this.vm = vm;
this.runtime = runtime;
this.setupGlobalEnvironment();
// Setup proxy system
const createProxyHelper = (value: unknown) => {
const proxyId = `proxy_${uuid()}`;
const needsProxy =
value !== null &&
value !== undefined &&
(typeof value === "object" || typeof value === "function");
if (needsProxy) {
this.hostFunctionRegistry.set(proxyId, value);
}
return { proxyId, needsProxy };
};
this.onInvokeHandler = createOnInvokeHandler(
this.hostFunctionRegistry,
createProxyHelper,
);
this.hostInvokeFn = createHostInvokeFn(
this.vm,
this.onInvokeHandler,
this.jsValueToHandle.bind(this),
this.handleToJsValue.bind(this),
this.vmHandleRegistry,
);
const factoryEval = this.vm.evalCode(PROXY_FACTORY_SRC);
Iif (factoryEval.error) {
const err = this.vm.dump(factoryEval.error);
factoryEval.error.dispose();
throw new Error("Failed to install proxy factory: " + String(err));
}
this.proxyFactory = factoryEval.value;
}
/**
* Creates a lazy proxy for objects and arrays
*/
private createLazyProxy(hostObj: unknown): QuickJSHandle {
const proxyId = `proxy_${uuid()}`;
this.hostFunctionRegistry.set(proxyId, hostObj);
const proxyIdHandle = this.vm.newString(proxyId);
const proxyResult = this.vm.callFunction(
this.proxyFactory,
this.vm.undefined,
proxyIdHandle,
this.hostInvokeFn,
this.proxyFactory,
);
proxyIdHandle.dispose();
Iif (proxyResult.error) {
const err = this.vm.dump(proxyResult.error);
proxyResult.error.dispose();
throw new Error("Failed to create proxy: " + String(err));
}
return proxyResult.value;
}
private setupGlobalEnvironment() {
this.runtime.setInterruptHandler(
shouldInterruptAfterDeadline(Date.now() + TIMEOUT_MS),
);
const consoleObj = this.vm.newObject();
this.vm.setProp(this.vm.global, "console", consoleObj);
const logFn = this.vm.newFunction("log", (...args) => {
if (process.env.NODE_ENV !== "production") {
const jsArgs = args.map((arg) => this.vm.dump(arg));
console.log(...jsArgs);
}
return this.vm.undefined;
});
this.vm.setProp(consoleObj, "log", logFn);
const warnFn = this.vm.newFunction("warn", (...args) => {
if (process.env.NODE_ENV !== "production") {
const jsArgs = args.map((arg) => this.vm.dump(arg));
console.warn(...jsArgs);
}
return this.vm.undefined;
});
this.vm.setProp(consoleObj, "warn", warnFn);
const errorFn = this.vm.newFunction("error", (...args) => {
if (process.env.NODE_ENV !== "production") {
const jsArgs = args.map((arg) => this.vm.dump(arg));
console.error(...jsArgs);
}
return this.vm.undefined;
});
this.vm.setProp(consoleObj, "error", errorFn);
const moduleObj = this.vm.newObject();
this.vm.setProp(this.vm.global, "module", moduleObj);
logFn.dispose();
warnFn.dispose();
errorFn.dispose();
consoleObj.dispose();
moduleObj.dispose();
}
/**
* Sets up mock require for file reading and plugin API
*/
setupMockRequire(readFile: FileReaderFn) {
const mockRequire = createMockRequire(readFile);
this.runtime.setModuleLoader((moduleName) => {
const mockModule = mockRequire[moduleName];
let namedExports = "";
Iif (mockModule && typeof mockModule === "object") {
const exportStatements = Object.keys(mockModule)
.filter(
(key) =>
key !== "default" &&
typeof (mockModule as Record<string, unknown>)[key] !==
"undefined",
)
.map((key) => `export const ${key} = _module?.${key};`)
.join("\n ");
namedExports = exportStatements;
}
const escapedModuleName = moduleName.replace(/["\\]/g, (m) => `\\${m}`);
return `
const _module = require("${escapedModuleName}");
export default _module.default || _module;
${namedExports}
`;
});
const requireFn = this.vm.newFunction("require", (moduleNameHandle) => {
const moduleName = this.vm.dump(moduleNameHandle) as string;
const module = mockRequire[moduleName];
if (!module) {
throw new Error(`Module '${moduleName}' not found`);
}
if (module && typeof module === "object" && this.proxyFactory) {
return this.createLazyProxy(module);
} else E{
return this.jsValueToHandle(module, false);
}
});
this.vm.setProp(this.vm.global, "require", requireFn);
requireFn.dispose();
}
/**
* Executes code and stores module exports
*/
executeCode(code: string, filename: string): void {
this.runtime.setInterruptHandler(
shouldInterruptAfterDeadline(Date.now() + TIMEOUT_MS),
);
const moduleType = detectModuleSystem(code);
Iif (moduleType === "module") {
const result = this.vm.evalCode(code, filename, { type: "module" });
Iif (result.error) {
const error = this.vm.dump(result.error);
result.error.dispose();
throw new Error(`VM execution failed: ${JSON.stringify(error)}`);
}
this.moduleExports = result.value;
} else {
const wrappedCode = `
const module = { exports: {} };
const exports = module.exports;
${code}
module.exports;
`;
const result = this.vm.evalCode(wrappedCode, filename);
if (result.error) {
const error = this.vm.dump(result.error);
result.error.dispose();
throw new Error(`VM execution failed: ${JSON.stringify(error)}`);
}
this.moduleExports = result.value;
}
}
/**
* Converts JS value to VM handle with selective proxy optimization
*/
private jsValueToHandle(value: unknown, useProxies: boolean): QuickJSHandle {
if (value === null) return this.vm.null;
if (value === undefined) return this.vm.undefined;
switch (typeof value) {
case "boolean":
return value ? this.vm.true : this.vm.false;
case "number":
return this.vm.newNumber(value);
case "string":
return this.vm.newString(value);
case "function":
return this.vm.newFunction(value.name || "anonymous", (...vmArgs) => {
const jsArgs = vmArgs.map((arg) => this.handleToJsValue(arg));
const result = (value as Function)(...jsArgs);
return this.jsValueToHandle(result, useProxies);
});
case "object":
if (useProxies) {
return this.createLazyProxy(value);
}
// Handle arrays
if (Array.isArray(value)) {
const arr = this.vm.newArray();
value.forEach((item, index) => {
const itemHandle = this.jsValueToHandle(item, useProxies);
this.vm.setProp(arr, String(index), itemHandle);
itemHandle.dispose();
});
return arr;
}
const obj = this.vm.newObject();
for (const [key, val] of Object.entries(value)) {
if (typeof val === "function") {
const fn = this.vm.newFunction(key, (...vmArgs) => {
const jsArgs = vmArgs.map((arg) => this.handleToJsValue(arg));
const result = (val as Function)(...jsArgs);
return this.jsValueToHandle(result, useProxies);
});
this.vm.setProp(obj, key, fn);
fn.dispose();
} else {
const valHandle = this.jsValueToHandle(val, useProxies);
this.vm.setProp(obj, key, valHandle);
valHandle.dispose();
}
}
return obj;
default:
return this.vm.undefined;
}
}
/**
* Converts VM handle to JS value with function pass-through handling
*/
private handleToJsValue(handle: QuickJSHandle): unknown {
const type = this.vm.typeof(handle);
switch (type) {
case "undefined":
return undefined;
case "boolean":
case "number":
case "string":
return this.vm.dump(handle);
case "object": {
Iif (handle === this.vm.null) {
return null;
}
const isArrayResult = this.vm.getProp(handle, "length");
if (isArrayResult && this.vm.typeof(isArrayResult) === "number") {
const length = this.vm.dump(isArrayResult) as number;
isArrayResult.dispose();
const result: unknown[] = [];
for (let i = 0; i < length; i++) {
const itemHandle = this.vm.getProp(handle, String(i));
result[i] = this.handleToJsValue(itemHandle);
itemHandle.dispose();
}
return result;
}
if (isArrayResult) {
isArrayResult.dispose();
}
const keysResult = this.vm.evalCode("Object.keys");
if (!keysResult.error) {
const keysFn = keysResult.value;
const objKeysResult = this.vm.callFunction(
keysFn,
this.vm.undefined,
handle,
);
keysFn.dispose();
if (!objKeysResult.error) {
const keys = this.vm.dump(objKeysResult.value) as string[];
objKeysResult.value.dispose();
const result: Record<string, unknown> = {};
for (const key of keys) {
Iif (key === "toString") continue;
const propHandle = this.vm.getProp(handle, key);
const propType = this.vm.typeof(propHandle);
if (propType === "function") {
const funcId = `func_${uuid()}`;
this.vmHandleRegistry.set(funcId, propHandle);
const persistentFn = (...args: unknown[]) => {
this.runtime.setInterruptHandler(
shouldInterruptAfterDeadline(Date.now() + TIMEOUT_MS),
);
const storedHandle = this.vmHandleRegistry.get(funcId);
Iif (!storedHandle) {
throw new Error(`Function handle ${funcId} not found`);
}
const argHandles = args.map((arg) =>
this.jsValueToHandle(arg, true),
);
let result;
try {
result = this.vm.callFunction(
storedHandle,
this.vm.undefined,
...argHandles,
);
if (result.error) {
const error = this.vm.dump(result.error);
result.error.dispose();
throw new Error(
`VM function call failed: ${JSON.stringify(error)}`,
);
}
const returnValue = this.handleToJsValue(result.value);
result.value.dispose();
return returnValue;
} finally {
argHandles.forEach((h) => h.dispose());
}
};
this.hostFunctionRegistry.set(funcId, persistentFn);
result[key] = persistentFn;
} else {
result[key] = this.handleToJsValue(propHandle);
propHandle.dispose();
}
}
return result;
} else {
objKeysResult.error.dispose();
}
} else E{
keysResult.error.dispose();
}
return this.vm.dump(handle);
}
case "function": {
throw new Error("Function handles are not supported here");
}
default:
return this.vm.dump(handle);
}
}
/**
* Calls a function on the module exports
*/
callModuleFunction(functionName: string, args: unknown[]): unknown {
Iif (!this.moduleExports) {
throw new Error("No module exports available");
}
this.runtime.setInterruptHandler(
shouldInterruptAfterDeadline(Date.now() + TIMEOUT_MS),
);
const fnHandle = this.vm.getProp(this.moduleExports, functionName);
if (this.vm.typeof(fnHandle) === "undefined") {
fnHandle.dispose();
throw new Error(`Function ${functionName} not found in module exports`);
}
const argHandles = args.map((arg) => {
if (arg && typeof arg === "object") {
return this.createLazyProxy(arg);
} else {
return this.jsValueToHandle(arg, false);
}
});
let result;
try {
result = this.vm.callFunction(fnHandle, this.vm.undefined, ...argHandles);
if (result.error) {
const error = this.vm.dump(result.error);
result.error.dispose();
if ("message" in error && typeof error.message === "string") {
Iif (error.message === "interrupted") {
error.message = `Plugin ${functionName}() timed out after ${TIMEOUT_MS}ms`;
}
}
throw new Error(
`Module function call failed: ${JSON.stringify(error)}`,
);
}
const returnValue = this.handleToJsValue(result.value);
result.value.dispose();
return returnValue;
} finally {
argHandles.forEach((h) => h.dispose());
fnHandle.dispose();
}
}
/**
* Gets a property from module exports
*/
getModuleProperty(propertyName: string): unknown {
Iif (!this.moduleExports) {
return undefined;
}
const propHandle = this.vm.getProp(this.moduleExports, propertyName);
const value = this.handleToJsValue(propHandle);
propHandle.dispose();
return value;
}
/**
* Checks if module exports has a property
*/
hasModuleProperty(propertyName: string): boolean {
Iif (!this.moduleExports) {
return false;
}
const propHandle = this.vm.getProp(this.moduleExports, propertyName);
const propType = this.vm.typeof(propHandle);
const hasProperty =
propHandle !== this.vm.undefined && propType !== "undefined";
propHandle.dispose();
return hasProperty;
}
/**
* Cleans up VM resources
*/
dispose(): void {
if (this.moduleExports) {
this.moduleExports.dispose();
this.moduleExports = null;
}
this.proxyFactory.dispose();
this.hostInvokeFn.dispose();
for (const handle of this.vmHandleRegistry.values()) {
handle.dispose();
}
this.vmHandleRegistry.clear();
this.vm.dispose();
this.runtime.dispose();
this.hostFunctionRegistry.clear();
}
}
/**
* Creates a new persistent VM instance
*/
const createPersistentVM = async (): Promise<PersistentVM> => {
const runtime = (await QuickJS).newRuntime();
const vm = runtime.newContext();
return new PersistentVM(vm, runtime);
};
/**
* Loads script event handlers in isolated QuickJS environment for security.
*/
export const loadScriptEventHandlerFromUntrustedString = async (
code: string,
filename: string,
readFile: FileReaderFn = noReadFileFn,
): Promise<ScriptEventHandlerWithCleanup> => {
const persistentVM = await createPersistentVM();
try {
persistentVM.setupMockRequire(readFile);
persistentVM.executeCode(convertESMToCommonJS(code), filename);
const metadata = {
id: persistentVM.getModuleProperty("id"),
name: persistentVM.getModuleProperty("name"),
description: persistentVM.getModuleProperty("description"),
fields: persistentVM.getModuleProperty("fields"),
groups: persistentVM.getModuleProperty("groups"),
subGroups: persistentVM.getModuleProperty("subGroups"),
weight: persistentVM.getModuleProperty("weight"),
deprecated: persistentVM.getModuleProperty("deprecated"),
editableSymbol: persistentVM.getModuleProperty("editableSymbol"),
allowChildrenBeforeInitFade: persistentVM.getModuleProperty(
"allowChildrenBeforeInitFade",
),
waitUntilAfterInitFade: persistentVM.getModuleProperty(
"waitUntilAfterInitFade",
),
helper: persistentVM.getModuleProperty("helper"),
presets: persistentVM.getModuleProperty("presets"),
userPresetsGroups: persistentVM.getModuleProperty("userPresetsGroups"),
userPresetsIgnore: persistentVM.getModuleProperty("userPresetsIgnore"),
};
const hasAutoLabel = persistentVM.hasModuleProperty("autoLabel");
validateHandlerMetadata(metadata, filename);
const baseHandler = createHandlerBase(metadata, hasAutoLabel, () =>
persistentVM.dispose(),
);
const handler: ScriptEventHandlerWithCleanup = {
...baseHandler,
hasAutoLabel,
autoLabel: hasAutoLabel
? (
fetchArg: (key: string) => string,
input: Record<string, unknown>,
) => {
const result = persistentVM.callModuleFunction("autoLabel", [
fetchArg,
input,
]);
return result as string;
}
: undefined,
compile: (input: unknown, helpers: unknown) => {
persistentVM.callModuleFunction("compile", [input, helpers]);
},
};
finalizeHandler(handler);
return handler;
} catch (error) {
persistentVM.dispose();
throw error;
}
};
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