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node_modules/wrangler/templates/middleware/common.ts

@@ -0,0 +1,67 @@
+export type Awaitable<T> = T | Promise<T>;
+// TODO: allow dispatching more events?
+export type Dispatcher = (
+	type: "scheduled",
+	init: { cron?: string }
+) => Awaitable<void>;
+
+export type IncomingRequest = Request<
+	unknown,
+	IncomingRequestCfProperties<unknown>
+>;
+
+export interface MiddlewareContext {
+	dispatch: Dispatcher;
+	next(request: IncomingRequest, env: any): Awaitable<Response>;
+}
+
+export type Middleware = (
+	request: IncomingRequest,
+	env: any,
+	ctx: ExecutionContext,
+	middlewareCtx: MiddlewareContext
+) => Awaitable<Response>;
+
+const __facade_middleware__: Middleware[] = [];
+
+// The register functions allow for the insertion of one or many middleware,
+// We register internal middleware first in the stack, but have no way of controlling
+// the order that addMiddleware is run in service workers so need an internal function.
+export function __facade_register__(...args: (Middleware | Middleware[])[]) {
+	__facade_middleware__.push(...args.flat());
+}
+export function __facade_registerInternal__(
+	...args: (Middleware | Middleware[])[]
+) {
+	__facade_middleware__.unshift(...args.flat());
+}
+
+function __facade_invokeChain__(
+	request: IncomingRequest,
+	env: any,
+	ctx: ExecutionContext,
+	dispatch: Dispatcher,
+	middlewareChain: Middleware[]
+): Awaitable<Response> {
+	const [head, ...tail] = middlewareChain;
+	const middlewareCtx: MiddlewareContext = {
+		dispatch,
+		next(newRequest, newEnv) {
+			return __facade_invokeChain__(newRequest, newEnv, ctx, dispatch, tail);
+		},
+	};
+	return head(request, env, ctx, middlewareCtx);
+}
+
+export function __facade_invoke__(
+	request: IncomingRequest,
+	env: any,
+	ctx: ExecutionContext,
+	dispatch: Dispatcher,
+	finalMiddleware: Middleware
+): Awaitable<Response> {
+	return __facade_invokeChain__(request, env, ctx, dispatch, [
+		...__facade_middleware__,
+		finalMiddleware,
+	]);
+}

node_modules/wrangler/templates/middleware/loader-modules.ts

@@ -0,0 +1,134 @@
+// This loads all middlewares exposed on the middleware object and then starts
+// the invocation chain. The big idea is that we can add these to the middleware
+// export dynamically through wrangler, or we can potentially let users directly
+// add them as a sort of "plugin" system.
+
+import ENTRY, { __INTERNAL_WRANGLER_MIDDLEWARE__ } from "__ENTRY_POINT__";
+import { __facade_invoke__, __facade_register__, Dispatcher } from "./common";
+import type { WorkerEntrypointConstructor } from "__ENTRY_POINT__";
+
+// Preserve all the exports from the worker
+export * from "__ENTRY_POINT__";
+
+class __Facade_ScheduledController__ implements ScheduledController {
+	readonly #noRetry: ScheduledController["noRetry"];
+
+	constructor(
+		readonly scheduledTime: number,
+		readonly cron: string,
+		noRetry: ScheduledController["noRetry"]
+	) {
+		this.#noRetry = noRetry;
+	}
+
+	noRetry() {
+		if (!(this instanceof __Facade_ScheduledController__)) {
+			throw new TypeError("Illegal invocation");
+		}
+		// Need to call native method immediately in case uncaught error thrown
+		this.#noRetry();
+	}
+}
+
+function wrapExportedHandler(worker: ExportedHandler): ExportedHandler {
+	// If we don't have any middleware defined, just return the handler as is
+	if (
+		__INTERNAL_WRANGLER_MIDDLEWARE__ === undefined ||
+		__INTERNAL_WRANGLER_MIDDLEWARE__.length === 0
+	) {
+		return worker;
+	}
+	// Otherwise, register all middleware once
+	for (const middleware of __INTERNAL_WRANGLER_MIDDLEWARE__) {
+		__facade_register__(middleware);
+	}
+
+	const fetchDispatcher: ExportedHandlerFetchHandler = function (
+		request,
+		env,
+		ctx
+	) {
+		if (worker.fetch === undefined) {
+			throw new Error("Handler does not export a fetch() function.");
+		}
+		return worker.fetch(request, env, ctx);
+	};
+
+	return {
+		...worker,
+		fetch(request, env, ctx) {
+			const dispatcher: Dispatcher = function (type, init) {
+				if (type === "scheduled" && worker.scheduled !== undefined) {
+					const controller = new __Facade_ScheduledController__(
+						Date.now(),
+						init.cron ?? "",
+						() => {}
+					);
+					return worker.scheduled(controller, env, ctx);
+				}
+			};
+			return __facade_invoke__(request, env, ctx, dispatcher, fetchDispatcher);
+		},
+	};
+}
+
+function wrapWorkerEntrypoint(
+	klass: WorkerEntrypointConstructor
+): WorkerEntrypointConstructor {
+	// If we don't have any middleware defined, just return the handler as is
+	if (
+		__INTERNAL_WRANGLER_MIDDLEWARE__ === undefined ||
+		__INTERNAL_WRANGLER_MIDDLEWARE__.length === 0
+	) {
+		return klass;
+	}
+	// Otherwise, register all middleware once
+	for (const middleware of __INTERNAL_WRANGLER_MIDDLEWARE__) {
+		__facade_register__(middleware);
+	}
+
+	// `extend`ing `klass` here so other RPC methods remain callable
+	return class extends klass {
+		#fetchDispatcher: ExportedHandlerFetchHandler<Record<string, unknown>> = (
+			request,
+			env,
+			ctx
+		) => {
+			this.env = env;
+			this.ctx = ctx;
+			if (super.fetch === undefined) {
+				throw new Error("Entrypoint class does not define a fetch() function.");
+			}
+			return super.fetch(request);
+		};
+
+		#dispatcher: Dispatcher = (type, init) => {
+			if (type === "scheduled" && super.scheduled !== undefined) {
+				const controller = new __Facade_ScheduledController__(
+					Date.now(),
+					init.cron ?? "",
+					() => {}
+				);
+				return super.scheduled(controller);
+			}
+		};
+
+		fetch(request: Request<unknown, IncomingRequestCfProperties>) {
+			return __facade_invoke__(
+				request,
+				this.env,
+				this.ctx,
+				this.#dispatcher,
+				this.#fetchDispatcher
+			);
+		}
+	};
+}
+
+let WRAPPED_ENTRY: ExportedHandler | WorkerEntrypointConstructor | undefined;
+if (typeof ENTRY === "object") {
+	WRAPPED_ENTRY = wrapExportedHandler(ENTRY);
+} else if (typeof ENTRY === "function") {
+	WRAPPED_ENTRY = wrapWorkerEntrypoint(ENTRY);
+}
+export default WRAPPED_ENTRY;

node_modules/wrangler/templates/middleware/loader-sw.ts

@@ -0,0 +1,229 @@
+import {
+	__facade_invoke__,
+	__facade_register__,
+	__facade_registerInternal__,
+	Awaitable,
+	Dispatcher,
+	IncomingRequest,
+	Middleware,
+} from "./common";
+
+export { __facade_register__, __facade_registerInternal__ };
+
+// Miniflare 2's `EventTarget` follows the spec and doesn't allow exceptions to
+// be caught by `dispatchEvent`. Instead it has a custom `ThrowingEventTarget`
+// class that rethrows errors from event listeners in `dispatchEvent`.
+// We'd like errors to be propagated to the top-level `addEventListener`, so
+// we'd like to use `ThrowingEventTarget`. Unfortunately, `ThrowingEventTarget`
+// isn't exposed on the global scope, but `WorkerGlobalScope` (which extends
+// `ThrowingEventTarget`) is. Therefore, we get at it in this nasty way.
+let __FACADE_EVENT_TARGET__: EventTarget;
+if ((globalThis as any).MINIFLARE) {
+	__FACADE_EVENT_TARGET__ = new (Object.getPrototypeOf(WorkerGlobalScope))();
+} else {
+	__FACADE_EVENT_TARGET__ = new EventTarget();
+}
+
+function __facade_isSpecialEvent__(
+	type: string
+): type is "fetch" | "scheduled" {
+	return type === "fetch" || type === "scheduled";
+}
+const __facade__originalAddEventListener__ = globalThis.addEventListener;
+const __facade__originalRemoveEventListener__ = globalThis.removeEventListener;
+const __facade__originalDispatchEvent__ = globalThis.dispatchEvent;
+
+globalThis.addEventListener = function (type, listener, options) {
+	if (__facade_isSpecialEvent__(type)) {
+		__FACADE_EVENT_TARGET__.addEventListener(
+			type,
+			listener as EventListenerOrEventListenerObject,
+			options
+		);
+	} else {
+		__facade__originalAddEventListener__(type, listener, options);
+	}
+};
+globalThis.removeEventListener = function (type, listener, options) {
+	if (__facade_isSpecialEvent__(type)) {
+		__FACADE_EVENT_TARGET__.removeEventListener(
+			type,
+			listener as EventListenerOrEventListenerObject,
+			options
+		);
+	} else {
+		__facade__originalRemoveEventListener__(type, listener, options);
+	}
+};
+globalThis.dispatchEvent = function (event) {
+	if (__facade_isSpecialEvent__(event.type)) {
+		return __FACADE_EVENT_TARGET__.dispatchEvent(event);
+	} else {
+		return __facade__originalDispatchEvent__(event);
+	}
+};
+
+declare global {
+	var addMiddleware: typeof __facade_register__;
+	var addMiddlewareInternal: typeof __facade_registerInternal__;
+}
+globalThis.addMiddleware = __facade_register__;
+globalThis.addMiddlewareInternal = __facade_registerInternal__;
+
+const __facade_waitUntil__ = Symbol("__facade_waitUntil__");
+const __facade_response__ = Symbol("__facade_response__");
+const __facade_dispatched__ = Symbol("__facade_dispatched__");
+
+class __Facade_ExtendableEvent__ extends Event {
+	[__facade_waitUntil__]: Awaitable<unknown>[] = [];
+
+	waitUntil(promise: Awaitable<any>) {
+		if (!(this instanceof __Facade_ExtendableEvent__)) {
+			throw new TypeError("Illegal invocation");
+		}
+		this[__facade_waitUntil__].push(promise);
+	}
+}
+
+interface FetchEventInit extends EventInit {
+	request: Request;
+	passThroughOnException: FetchEvent["passThroughOnException"];
+}
+
+class __Facade_FetchEvent__ extends __Facade_ExtendableEvent__ {
+	#request: Request;
+	#passThroughOnException: FetchEvent["passThroughOnException"];
+	[__facade_response__]?: Awaitable<Response>;
+	[__facade_dispatched__] = false;
+
+	constructor(type: "fetch", init: FetchEventInit) {
+		super(type);
+		this.#request = init.request;
+		this.#passThroughOnException = init.passThroughOnException;
+	}
+
+	get request() {
+		return this.#request;
+	}
+
+	respondWith(response: Awaitable<Response>) {
+		if (!(this instanceof __Facade_FetchEvent__)) {
+			throw new TypeError("Illegal invocation");
+		}
+		if (this[__facade_response__] !== undefined) {
+			throw new DOMException(
+				"FetchEvent.respondWith() has already been called; it can only be called once.",
+				"InvalidStateError"
+			);
+		}
+		if (this[__facade_dispatched__]) {
+			throw new DOMException(
+				"Too late to call FetchEvent.respondWith(). It must be called synchronously in the event handler.",
+				"InvalidStateError"
+			);
+		}
+		this.stopImmediatePropagation();
+		this[__facade_response__] = response;
+	}
+
+	passThroughOnException() {
+		if (!(this instanceof __Facade_FetchEvent__)) {
+			throw new TypeError("Illegal invocation");
+		}
+		// Need to call native method immediately in case uncaught error thrown
+		this.#passThroughOnException();
+	}
+}
+
+interface ScheduledEventInit extends EventInit {
+	scheduledTime: number;
+	cron: string;
+	noRetry: ScheduledEvent["noRetry"];
+}
+
+class __Facade_ScheduledEvent__ extends __Facade_ExtendableEvent__ {
+	#scheduledTime: number;
+	#cron: string;
+	#noRetry: ScheduledEvent["noRetry"];
+
+	constructor(type: "scheduled", init: ScheduledEventInit) {
+		super(type);
+		this.#scheduledTime = init.scheduledTime;
+		this.#cron = init.cron;
+		this.#noRetry = init.noRetry;
+	}
+
+	get scheduledTime() {
+		return this.#scheduledTime;
+	}
+
+	get cron() {
+		return this.#cron;
+	}
+
+	noRetry() {
+		if (!(this instanceof __Facade_ScheduledEvent__)) {
+			throw new TypeError("Illegal invocation");
+		}
+		// Need to call native method immediately in case uncaught error thrown
+		this.#noRetry();
+	}
+}
+
+__facade__originalAddEventListener__("fetch", (event) => {
+	const ctx: ExecutionContext = {
+		waitUntil: event.waitUntil.bind(event),
+		passThroughOnException: event.passThroughOnException.bind(event),
+	};
+
+	const __facade_sw_dispatch__: Dispatcher = function (type, init) {
+		if (type === "scheduled") {
+			const facadeEvent = new __Facade_ScheduledEvent__("scheduled", {
+				scheduledTime: Date.now(),
+				cron: init.cron ?? "",
+				noRetry() {},
+			});
+
+			__FACADE_EVENT_TARGET__.dispatchEvent(facadeEvent);
+			event.waitUntil(Promise.all(facadeEvent[__facade_waitUntil__]));
+		}
+	};
+
+	const __facade_sw_fetch__: Middleware = function (request, _env, ctx) {
+		const facadeEvent = new __Facade_FetchEvent__("fetch", {
+			request,
+			passThroughOnException: ctx.passThroughOnException,
+		});
+
+		__FACADE_EVENT_TARGET__.dispatchEvent(facadeEvent);
+		facadeEvent[__facade_dispatched__] = true;
+		event.waitUntil(Promise.all(facadeEvent[__facade_waitUntil__]));
+
+		const response = facadeEvent[__facade_response__];
+		if (response === undefined) {
+			throw new Error("No response!"); // TODO: proper error message
+		}
+		return response;
+	};
+
+	event.respondWith(
+		__facade_invoke__(
+			event.request as IncomingRequest,
+			globalThis,
+			ctx,
+			__facade_sw_dispatch__,
+			__facade_sw_fetch__
+		)
+	);
+});
+
+__facade__originalAddEventListener__("scheduled", (event) => {
+	const facadeEvent = new __Facade_ScheduledEvent__("scheduled", {
+		scheduledTime: event.scheduledTime,
+		cron: event.cron,
+		noRetry: event.noRetry.bind(event),
+	});
+
+	__FACADE_EVENT_TARGET__.dispatchEvent(facadeEvent);
+	event.waitUntil(Promise.all(facadeEvent[__facade_waitUntil__]));
+});

node_modules/wrangler/templates/middleware/middleware-ensure-req-body-drained.ts

@@ -0,0 +1,18 @@
+import type { Middleware } from "./common";
+
+const drainBody: Middleware = async (request, env, _ctx, middlewareCtx) => {
+	try {
+		return await middlewareCtx.next(request, env);
+	} finally {
+		try {
+			if (request.body !== null && !request.bodyUsed) {
+				const reader = request.body.getReader();
+				while (!(await reader.read()).done) {}
+			}
+		} catch (e) {
+			console.error("Failed to drain the unused request body.", e);
+		}
+	}
+};
+
+export default drainBody;

node_modules/wrangler/templates/middleware/middleware-miniflare3-json-error.ts

@@ -0,0 +1,32 @@
+import type { Middleware } from "./common";
+
+interface JsonError {
+	message?: string;
+	name?: string;
+	stack?: string;
+	cause?: JsonError;
+}
+
+function reduceError(e: any): JsonError {
+	return {
+		name: e?.name,
+		message: e?.message ?? String(e),
+		stack: e?.stack,
+		cause: e?.cause === undefined ? undefined : reduceError(e.cause),
+	};
+}
+
+// See comment in `bundle.ts` for details on why this is needed
+const jsonError: Middleware = async (request, env, _ctx, middlewareCtx) => {
+	try {
+		return await middlewareCtx.next(request, env);
+	} catch (e: any) {
+		const error = reduceError(e);
+		return Response.json(error, {
+			status: 500,
+			headers: { "MF-Experimental-Error-Stack": "true" },
+		});
+	}
+};
+
+export default jsonError;

node_modules/wrangler/templates/middleware/middleware-patch-console-prefix.d.ts

@@ -0,0 +1,3 @@
+declare module "config:middleware/patch-console-prefix" {
+	export const prefix: string;
+}

node_modules/wrangler/templates/middleware/middleware-patch-console-prefix.ts

@@ -0,0 +1,21 @@
+/// <reference path="middleware-patch-console-prefix.d.ts"/>
+
+import { prefix } from "config:middleware/patch-console-prefix";
+import type { Middleware } from "./common";
+
+// Directly patch console methods to add worker prefix.
+// We capture the original method once and replace with a wrapper.
+// This approach allows third-party code to wrap console methods
+(["log", "debug", "info"] as const).forEach((method) => {
+	globalThis.console[method] = new Proxy(globalThis.console[method], {
+		apply(target, thisArg, argumentsList) {
+			return target.apply(thisArg, [prefix, ...argumentsList]);
+		},
+	});
+});
+
+const passthrough: Middleware = (request, env, _ctx, middlewareCtx) => {
+	return middlewareCtx.next(request, env);
+};
+
+export default passthrough;

node_modules/wrangler/templates/middleware/middleware-pretty-error.ts

@@ -0,0 +1,40 @@
+import type { Middleware } from "./common";
+
+// A middleware has to be a function of type Middleware
+const prettyError: Middleware = async (request, env, _ctx, middlewareCtx) => {
+	try {
+		const response = await middlewareCtx.next(request, env);
+		return response;
+	} catch (e: any) {
+		const html = `
+    <!DOCTYPE html>
+    <html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <meta http-equiv="X-UA-Compatible" content="IE=edge">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <title>Error 🚨</title>
+        <style>
+          pre {
+            margin: 16px auto;
+            max-width: 600px;
+            background-color: #eeeeee;
+            border-radius: 4px;
+            padding: 16px;
+          }
+        </style>
+    </head>
+    <body>
+        <pre>${e.stack}</pre>
+    </body>
+    </html>
+    `;
+
+		return new Response(html, {
+			status: 500,
+			headers: { "Content-Type": "text/html;charset=utf-8" },
+		});
+	}
+};
+
+export default prettyError;

node_modules/wrangler/templates/middleware/middleware-scheduled.ts

@@ -0,0 +1,29 @@
+import type { Middleware } from "./common";
+
+// A middleware has to be a function of type Middleware
+const scheduled: Middleware = async (request, env, _ctx, middlewareCtx) => {
+	const url = new URL(request.url);
+	if (url.pathname === "/__scheduled") {
+		const cron = url.searchParams.get("cron") ?? "";
+		await middlewareCtx.dispatch("scheduled", { cron });
+
+		return new Response("Ran scheduled event");
+	}
+
+	const resp = await middlewareCtx.next(request, env);
+
+	// If you open the `/__scheduled` page in a browser, the browser will automatically make a request to `/favicon.ico`.
+	// For scheduled Workers _without_ a fetch handler, this will result in a 500 response that clutters the log with unhelpful error messages.
+	// To avoid this, inject a 404 response to favicon.ico loads on the `/__scheduled` page
+	if (
+		request.headers.get("referer")?.endsWith("/__scheduled") &&
+		url.pathname === "/favicon.ico" &&
+		resp.status === 500
+	) {
+		return new Response(null, { status: 404 });
+	}
+
+	return resp;
+};
+
+export default scheduled;