debug resolve url endpoint

src/serverScripts/photonApi.ts

@@ -1,6 +1,6 @@
 import express from "express";
 import RateLimit from "express-rate-limit";
-import fetch from "node-fetch";
+import fetch, { Response } from "node-fetch";
 import youtube_dl from "youtube-dl-exec";
 import {
 	basicRateLimitConfig,
@@ -177,7 +177,7 @@ photonApiRouter.get("/resolveRedditUrl", RateLimit(tokenRequestRateLimitConfig),
 	if (url.startsWith("/"))
 		url = "https://www.reddit.com" + url;
 
-	let response;
+	let response: Response;
 	let isRedirect = false;
 	const supportedRedditUrl = /^https:\/\/(\w+\.)?reddit.com\/(r|u|user)\/[^/#?]+\//;
 	do {
@@ -208,3 +208,55 @@ photonApiRouter.get("/resolveRedditUrl", RateLimit(tokenRequestRateLimitConfig),
 
 	res.json({ url, path: urlObj.pathname });
 }));
+
+
+photonApiRouter.get("/resolveRedditUrlDebug", RateLimit(tokenRequestRateLimitConfig), safeExcAsync(async (req, res) => {
+	let url = req.query["url"].toString();
+	if (!url) {
+		res.status(400).json({ error: "¯\\_(ツ)_/¯" });
+		return;
+	}
+	if (url.startsWith("https://reddit.com/"))
+	url = url.replace("https://reddit.com/", "https://www.reddit.com/");
+	if (url.startsWith("/"))
+		url = "https://www.reddit.com" + url;
+
+	let response: Response;
+	let isRedirect = false;
+	const supportedRedditUrl = /^https:\/\/(\w+\.)?reddit.com\/(r|u|user)\/[^/#?]+\//;
+	do {
+		response = await fetch(url, {
+			redirect: "manual",
+			headers: {
+				"User-Agent": `web_backend:photon-reddit.com:v${photonVersion} (by /u/RaiderBDev)`
+			}
+		});
+		let newUrl = response.headers.get("location");
+		if (!newUrl)
+			break;
+		if (!newUrl.startsWith("http"))
+			newUrl = new URL(newUrl, response.url).href;
+		url = newUrl;
+		isRedirect = response.status >= 300 && response.status < 400;
+	}
+	while (isRedirect && !supportedRedditUrl.test(url));
+
+	if (!supportedRedditUrl.test(url)) {
+		res.status(400).json({ error: "Failed to resolve url" });
+		return;
+	}
+	const urlObj = new URL(url);
+	urlObj.search = "";
+	urlObj.hash = "";
+	url = urlObj.toString();
+
+	res.json({
+		url,
+		path: urlObj.pathname,
+		response: {
+			status: response.status,
+			headers: response.headers.raw(),
+			text: await response.text()
+		}
+	});
+}));