Rewrite

src/lib/utils.ts

@@ -0,0 +1,94 @@
+// Adapted from http://matthewfl.com/unPacker.html by matthew@matthewfl.com
+export async function unpack(packed: string): Promise<string> {
+	let context = `
+		{
+			eval: function (c) {
+				packed = c;
+			},
+			window: {},
+			document: {}
+		}
+	`;
+	const toExecute = `
+        function() {
+            let packed = "";
+            with(${context}) {
+                ${packed}
+            };
+            return packed;
+        }'
+    `;
+
+	const res: string = await runInPageContext(toExecute);
+	return res
+		.replace(/;/g, ';\n')
+		.replace(/{/g, '\n{\n')
+		.replace(/}/g, '\n}\n')
+		.replace(/\n;\n/g, ';\n')
+		.replace(/\n\\n/g, '\n');
+}
+
+// Adapted from: https://github.com/arikw/extension-page-context
+async function runInPageContext<T>(toExecute: string): Promise<T> {
+	// test that we are running with the allow-scripts permission
+	try {
+		window.sessionStorage;
+	} catch (ignore) {
+		return null;
+	}
+
+	// returned value container
+	const resultMessageId = crypto.randomUUID();
+
+	// prepare script container
+	const scriptElm = document.createElement('script');
+	scriptElm.setAttribute('type', 'application/javascript');
+
+	const code = `
+        (
+            async function () {
+
+                    const response = {
+                        id: ${resultMessageId}
+                    };
+
+                    try {
+                        response.result = JSON.stringify(await (${toExecute})() ); // run script
+                    } catch(err) {
+                        response.error = JSON.stringify(err);
+                    }
+            
+                    window.postMessage(response, '*');
+            }
+        )();
+    `;
+
+	// inject the script
+	scriptElm.textContent = code;
+
+	// run the script
+	document.documentElement.appendChild(scriptElm);
+
+	// clean up script element
+	scriptElm.remove();
+
+	let resolve: (value: T) => void;
+	let reject: (value: any) => void;
+	const promise = new Promise<T>((res, rej) => {
+		resolve = res;
+		reject = rej;
+	});
+	function onResult(event: MessageEvent) {
+		if (event.data.id === resultMessageId) {
+			window.removeEventListener('message', onResult);
+			if (event.data.error !== undefined) {
+				return reject(JSON.parse(event.data.error));
+			}
+			return resolve(event.data.result !== undefined ? JSON.parse(event.data.result) : undefined);
+		}
+	}
+
+	window.addEventListener('message', onResult);
+
+	return await promise;
+}