Instance owners can disable RSS

RSS is still enabled by default, but will be disabled on bibliogram.art.

src/site/api/feed.js

@@ -1,27 +1,49 @@
 const constants = require("../../lib/constants")
-const {fetchUser} = require("../../lib/collectors")
+const {fetchUser, requestCache} = require("../../lib/collectors")
 const {render} = require("pinski/plugins")
+const {pugCache} = require("../passthrough")
 
 module.exports = [
 	{route: `/u/(${constants.external.username_regex})/rss.xml`, methods: ["GET"], code: ({fill}) => {
-		return fetchUser(fill[0]).then(async user => {
-			const content = await user.timeline.fetchFeed()
-			const xml = content.xml()
-			return {
-				statusCode: 200,
-				contentType: "application/rss+xml", // see https://stackoverflow.com/questions/595616/what-is-the-correct-mime-type-to-use-for-an-rss-feed
-				content: xml
-			}
-		}).catch(error => {
-			if (error === constants.symbols.NOT_FOUND) {
-				return render(404, "pug/friendlyerror.pug", {
-					statusCode: 404,
-					title: "Not found",
-					message: "This user doesn't exist."
-				})
-			} else {
-				throw error
-			}
-		})
+		if (constants.settings.rss_enabled) {
+			return fetchUser(fill[0]).then(async user => {
+				const content = await user.timeline.fetchFeed()
+				const xml = content.xml()
+				return {
+					statusCode: 200,
+					contentType: "application/rss+xml", // see https://stackoverflow.com/questions/595616/what-is-the-correct-mime-type-to-use-for-an-rss-feed
+					content: xml
+				}
+			}).catch(error => {
+				if (error === constants.symbols.NOT_FOUND) {
+					return render(404, "pug/friendlyerror.pug", {
+						statusCode: 404,
+						title: "Not found",
+						message: "This user doesn't exist.",
+						withInstancesLink: false
+					})
+				} else if (error === constants.symbols.INSTAGRAM_DEMANDS_LOGIN) {
+					return {
+						statusCode: 503,
+						contentType: "text/html",
+						headers: {
+							"Retry-After": requestCache.getTtl("user/"+fill[0], 1000)
+						},
+						content: pugCache.get("pug/blocked.pug").web({
+							expiresMinutes: requestCache.getTtl("user/"+fill[0], 1000*60)
+						})
+					}
+				} else {
+					throw error
+				}
+			})
+		} else {
+			return Promise.resolve(render(403, "pug/friendlyerror.pug", {
+				statusCode: 403,
+				title: "RSS disabled",
+				message: "RSS is disabled on this instance.",
+				withInstancesLink: true
+			}))
+		}
 	}}
 ]