wip: download of Worker script

Workaround for handling multipart/form-data slicing off top and bottom boundaries.
- [] Need to prevent download in existing projects
- [] Duplicate the logic for JS files

multipart/formdata not supported currently in Undici nodejs/undici#974

packages/wrangler/src/cfetch/internal.ts

@@ -179,3 +179,42 @@ export async function fetchR2Objects(
 		);
 	}
 }
+
+/**
+ * This is a wrapper STOPGAP for getting the script which returns a raw text response.
+ * TODO: remove this once the API is fixed and utilize fetchResult instead. - JACOB
+ */
+export async function fetchDashboardScript(
+	resource: string,
+	bodyInit: RequestInit = {}
+): Promise<string> {
+	await requireLoggedIn();
+	const auth = requireApiToken();
+	const headers = cloneHeaders(bodyInit.headers);
+	addAuthorizationHeaderIfUnspecified(headers, auth);
+	addUserAgent(headers);
+
+	const response = await fetch(`${getCloudflareAPIBaseURL()}${resource}`, {
+		...bodyInit,
+		headers,
+	});
+
+	if (!response.ok || !response.body) {
+		throw new Error(
+			`Failed to fetch ${resource} - ${response.status}: ${response.statusText});`
+		);
+	}
+
+	const usesModules = response.headers
+		.get("content-type")
+		?.startsWith("multipart");
+
+	// Follow up on issue in Undici about multipart/form-data support & replace the workaround: https://github.com/nodejs/undici/issues/974
+	if (usesModules) {
+		const file = await response.text();
+
+		return file.split("\n").slice(4, -4).join("\n");
+	} else {
+		return response.text();
+	}
+}

packages/wrangler/src/init.ts

@@ -5,12 +5,16 @@ import TOML from "@iarna/toml";
 import { findUp } from "find-up";
 import { version as wranglerVersion } from "../package.json";
 
+import { fetchDashboardScript } from "./cfetch/internal";
+import { readConfig } from "./config";
 import { confirm, select } from "./dialogs";
 import { initializeGit, isGitInstalled, isInsideGitRepo } from "./git-client";
 import { logger } from "./logger";
 import { getPackageManager } from "./package-manager";
 import { parsePackageJSON, parseTOML, readFileSync } from "./parse";
+import { requireAuth } from "./user";
 import { CommandLineArgsError, printWranglerBanner } from "./index";
+import type { ConfigPath } from "./index";
 
 import type { Argv, ArgumentsCamelCase } from "yargs";
 
@@ -36,6 +40,11 @@ export async function initOptions(yargs: Argv) {
 			describe: 'Answer "yes" to any prompts for new projects',
 			type: "boolean",
 			alias: "y",
+		})
+		.option("from-dash", {
+			describe: "Use script from the dashboard editor",
+			type: "string",
+			hidden: true,
 		});
 }
 
@@ -431,13 +440,43 @@ export async function initHandler(args: ArgumentsCamelCase<InitArgs>) {
 
 		return {};
 	}
-
+	// This is where I need to replace the Source script
+	const fromDashboard = args["from-dash"] as string;
 	if (isTypescriptProject) {
 		if (!fs.existsSync(path.join(creationDirectory, "./src/index.ts"))) {
 			const newWorkerFilename = path.relative(
 				process.cwd(),
 				path.join(creationDirectory, "./src/index.ts")
 			);
+			if (fromDashboard) {
+				const config = readConfig(args.config as ConfigPath, args);
+				const accountId = await requireAuth(config);
+				await mkdir(path.join(creationDirectory, "./src"), {
+					recursive: true,
+				});
+
+				const dashScript = await fetchDashboardScript(
+					`/accounts/${accountId}/workers/scripts/${fromDashboard}`,
+					{
+						method: "GET",
+					}
+				);
+
+				await writeFile(
+					path.join(creationDirectory, "./src/index.ts"),
+					dashScript
+				);
+
+				await writePackageJsonScriptsAndUpdateWranglerToml(
+					shouldWritePackageJsonScripts,
+					justCreatedWranglerToml,
+					pathToPackageJson,
+					"src/index.ts",
+					{}
+				);
+
+				return;
+			}
 
 			const newWorkerType = yesFlag
 				? "fetch"