Allow got as request backend

src/lib/utils/request.js

@@ -1,16 +1,39 @@
-const fetch = require("node-fetch").default
+const NodeFetch = require("./requestbackends/node-fetch")
+const Got = require("./requestbackends/got")
 
+const constants = require("../constants")
+
+const userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36"
+
+const backendStatusLineMap = new Map([
+	["node-fetch", "NF "],
+	["got", "GOT"]
+])
+
+/**
+ * @returns {import("./requestbackends/reference")}
+ */
 function request(url, options = {}, settings = {}) {
 	if (settings.statusLine === undefined) settings.statusLine = "OUT"
 	if (settings.log === undefined) settings.log = true
-	if (settings.log) console.log(`          -> [${settings.statusLine}] ${url}`) // todo: make more like pinski?
-	// @ts-ignore
-	return fetch(url, Object.assign({
-		headers: {
-			"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36"
-		},
-		redirect: "manual"
-	}, options))
+	if (settings.log) console.log(`      -> [${settings.statusLine}-${backendStatusLineMap.get(constants.request_backend)}] ${url}`) // todo: make more like pinski?
+	if (constants.request_backend === "node-fetch") {
+		return new NodeFetch(url, Object.assign({
+			headers: {
+				"User-Agent": userAgent
+			},
+			redirect: "manual"
+		}, options))
+	} else if (constants.request_backend === "got") {
+		return new Got(url, Object.assign({
+			headers: {
+				"User-Agent": userAgent
+			},
+			followRedirect: false
+		}, options))
+	} else {
+		throw new Error("Invalid value for setting `request_backend`.")
+	}
 }
 
 module.exports.request = request