add content-type and content-disposition

.gitignore

@@ -1,2 +1,3 @@
 node_modules
-.env
+.env
+output.log

index.js

@@ -2,6 +2,7 @@ require("dotenv").config();
 var {MongoClient, GridFSBucket} = require("mongodb");
 var express = require("express");
 var app = express();
+app.set("trust proxy", "127.0.0.1");
 var dbclient = new MongoClient(process.env.DB_URI);
 dbclient.connect().then(async () => {
 	var db = dbclient.db("mikudb");
@@ -17,15 +18,18 @@ dbclient.connect().then(async () => {
 	app.get("/https://www.pixiv.net/en/artworks/:id", async (req, res) => {
 		//if (req.headers["cache-control"] == "max-age=0") { // this indicates a reload in chrome
 		// but chrome still sends it after redirect
-		if (ipa_lastload_map[req.ip] == req.params.id) {
+		if (ipa_lastload_map[req.ip] == req.params.id && req.query.noredirect == null) {
 			return redirectRandom(req, res); 
 		} else ipa_lastload_map[req.ip] = req.params.id;
 		console.log(new Date().toLocaleString(), req.ip, req.params.id);
 		var asdf = await collection.findOne({_id: req.params.id}, {downloaded_images: 1});
 		if (!asdf) return res.sendStatus(404);
+		var filename = Object.keys(asdf.downloaded_images)[0];
+		res.type(filename.split('.').pop());
+		res.header("Content-Disposition", `filename=${filename}`);
 		var gfsid = Object.values(asdf.downloaded_images)[0];
 		bucket.openDownloadStream(gfsid).pipe(res);
 	});
-	app.listen(8039);
+	app.listen(39);
 	console.log("server ready");
 });