RSS

config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	website_origin: "http://localhost:10407"
+}

package-lock.json

@@ -1384,6 +1384,30 @@
         "glob": "^7.1.3"
       }
     },
+    "rss": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/rss/-/rss-1.2.2.tgz",
+      "integrity": "sha1-UKFpiHYTgTOnT5oF0r3I240nqSE=",
+      "requires": {
+        "mime-types": "2.1.13",
+        "xml": "1.0.1"
+      },
+      "dependencies": {
+        "mime-db": {
+          "version": "1.25.0",
+          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.25.0.tgz",
+          "integrity": "sha1-wY29fHOl2/b0SgJNwNFloeexw5I="
+        },
+        "mime-types": {
+          "version": "2.1.13",
+          "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.13.tgz",
+          "integrity": "sha1-4HqqnGxrmnyjASxpADrSWjnpKog=",
+          "requires": {
+            "mime-db": "~1.25.0"
+          }
+        }
+      }
+    },
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
@@ -1748,6 +1772,11 @@
       "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.1.tgz",
       "integrity": "sha512-sucePNSafamSKoOqoNfBd8V0StlkzJKL2ZAhGQinCfNQ+oacw+Pk7lcdAElecBF2VkLNZRiIb5Oi1Q5lVUVt2A=="
     },
+    "xml": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/xml/-/xml-1.0.1.tgz",
+      "integrity": "sha1-eLpyAgApxbyHuKgaPPzXS0ovweU="
+    },
     "y18n": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",

package.json

@@ -13,6 +13,7 @@
     "gm": "^1.23.1",
     "node-dir": "^0.1.17",
     "node-fetch": "^2.6.0",
-    "pinski": "github:cloudrac3r/pinski#6df26c4d35ff845a4ac56485a79a52970ea50c87"
+    "pinski": "github:cloudrac3r/pinski#6df26c4d35ff845a4ac56485a79a52970ea50c87",
+    "rss": "^1.2.2"
   }
 }

src/lib/cache.js

@@ -22,6 +22,10 @@ class InstaCache {
 		return this.cache.get(key).data
 	}
 
+	getTtl(key, factor = 1) {
+		return Math.max((Math.floor(Date.now() - this.cache.get(key).time) / factor), 0)
+	}
+
 	/**
 	 * @param {string} key
 	 * @param {any} data

src/lib/collectors.js

@@ -5,7 +5,7 @@ const InstaCache = require("./cache")
 const {User} = require("./structures")
 require("./testimports")(constants, request, extractSharedData, InstaCache, User)
 
-const cache = new InstaCache(600e3)
+const cache = new InstaCache(constants.resource_cache_time)
 
 function fetchUser(username) {
 	return cache.getOrFetch("user/"+username, () => {

src/lib/constants.js

@@ -1,9 +1,11 @@
 module.exports = {
 	image_cache_control: `public, max-age=${7*24*60*60}`,
+	resource_cache_time: 30*60*1000,
 
 	external: {
 		timeline_query_hash: "e769aa130647d2354c40ea6a439bfc08",
-		timeline_fetch_first: 12
+		timeline_fetch_first: 12,
+		username_regex: "[\\w.]+"
 	},
 
 	symbols: {

src/lib/structures/Timeline.js

@@ -1,8 +1,11 @@
+const RSS = require("rss")
 const constants = require("../constants")
+const config = require("../../../config")
 const TimelineImage = require("./TimelineImage")
 const collectors = require("../collectors")
 require("../testimports")(constants, TimelineImage)
 
+/** @param {any[]} edges */
 function transformEdges(edges) {
 	return edges.map(e => new TimelineImage(e.node))
 }
@@ -13,6 +16,7 @@ class Timeline {
 	 */
 	constructor(user) {
 		this.user = user
+		/** @type {import("./TimelineImage")[][]} */
 		this.pages = []
 		this.addPage(this.user.data.edge_owner_to_timeline_media)
 		this.page_info = this.user.data.edge_owner_to_timeline_media.page_info
@@ -40,6 +44,23 @@ class Timeline {
 		this.pages.push(transformEdges(page.edges))
 		this.page_info = page.page_info
 	}
+
+	getFeed() {
+		const feed = new RSS({
+			title: `@${this.user.data.username}`,
+			feed_url: `${config.website_origin}/u/${this.user.data.username}/rss.xml`,
+			site_url: config.website_origin,
+			description: this.user.data.biography,
+			image_url: this.user.data.profile_pic_url,
+			pubDate: new Date(this.user.cachedAt),
+			ttl: this.user.getTtl(1000*60) // scale to minute
+		})
+		const page = this.pages[0] // only get posts from first page
+		for (const item of page) {
+			feed.item(item.getFeedData())
+		}
+		return feed
+	}
 }
 
 module.exports = Timeline

src/lib/structures/TimelineImage.js

@@ -1,9 +1,23 @@
+const config = require("../../../config")
+const {proxyImage} = require("../utils/proxyurl")
+const {compile} = require("pug")
+
+const rssDescriptionTemplate = compile(`
+img(alt=alt src=src)
+p(style='white-space: pre-line')= caption
+`)
+
 class GraphImage {
 	/**
 	 * @param {import("../types").GraphImage} data
 	 */
 	constructor(data) {
 		this.data = data
+		this.data.edge_media_to_caption.edges.forEach(edge => edge.node.text = edge.node.text.replace(/\u2063/g, "")) // I don't know why U+2063 INVISIBLE SEPARATOR is in here, but it is, and it causes rendering issues with certain fonts.
+	}
+
+	getProxy(url) {
+		return proxyImage(url)
 	}
 
 	/**
@@ -32,10 +46,34 @@ class GraphImage {
 		else return null
 	}
 
+	getIntroduction() {
+		const caption = this.getCaption()
+		if (caption) return caption.split("\n")[0].split(". ")[0] // try to get first meaningful line or sentence
+		else return null
+	}
+
 	getAlt() {
 		// For some reason, pages 2+ don't contain a11y data. Instagram web client falls back to image caption.
 		return this.data.accessibility_caption || this.getCaption() || "No image description available."
 	}
+
+	getFeedData() {
+		return {
+			title: this.getIntroduction() || "No caption provided",
+			description: rssDescriptionTemplate({src: this.data.display_url, alt: this.getAlt(), caption: this.getCaption()}),
+			author: this.data.owner.username,
+			url: `${config.website_origin}/p/${this.data.shortcode}`,
+			guid: `${config.website_origin}/p/${this.data.shortcode}`,
+			date: new Date(this.data.taken_at_timestamp*1000)
+			/*
+				Readers should display the description as HTML rather than using the media enclosure.
+				enclosure: {
+					url: this.data.display_url,
+					type: "image/jpeg" //TODO: can instagram have PNGs? everything is JPEG according to https://medium.com/@autolike.it/how-to-avoid-low-res-thumbnails-on-instagram-android-problem-bc24f0ed1c7d
+				}
+			*/
+		}
+	}
 }
 
 module.exports = GraphImage

src/lib/structures/User.js

@@ -1,5 +1,7 @@
+const constants = require("../constants")
+const {proxyImage} = require("../utils/proxyurl")
 const Timeline = require("./Timeline")
-require("../testimports")(Timeline)
+require("../testimports")(constants, Timeline)
 
 class User {
 	/**
@@ -11,6 +13,14 @@ class User {
 		this.followedBy = data.edge_followed_by.count
 		this.posts = data.edge_owner_to_timeline_media.count
 		this.timeline = new Timeline(this)
+		this.cachedAt = Date.now()
+		this.proxyProfilePicture = proxyImage(this.data.profile_pic_url)
+	}
+
+	getTtl(scale = 1) {
+		const expiresAt = this.cachedAt + constants.resource_cache_time
+		const ttl = expiresAt - Date.now()
+		return Math.ceil(Math.max(ttl, 0) / scale)
 	}
 
 	export() {

src/lib/utils/proxyurl.js

@@ -0,0 +1,7 @@
+function proxyImage(url) {
+	const params = new URLSearchParams()
+	params.set("url", url)
+	return "/imageproxy?"+params.toString()
+}
+
+module.exports.proxyImage = proxyImage

src/site/api/api.js

@@ -1,3 +1,4 @@
+const constants = require("../../lib/constants")
 const {fetchUser} = require("../../lib/collectors")
 
 function reply(statusCode, content) {
@@ -9,7 +10,7 @@ function reply(statusCode, content) {
 }
 
 module.exports = [
-	{route: "/api/user/(\\w+)", methods: ["GET"], code: async ({fill}) => {
+	{route: `/api/user/(${constants.external.username_regex})`, methods: ["GET"], code: async ({fill}) => {
 		const user = await fetchUser(fill[0])
 		const data = user.export()
 		return reply(200, data)

src/site/api/feed.js

@@ -0,0 +1,15 @@
+const constants = require("../../lib/constants")
+const {fetchUser} = require("../../lib/collectors")
+const {render} = require("pinski/plugins")
+
+module.exports = [
+	{route: `/u/(${constants.external.username_regex})/rss.xml`, methods: ["GET"], code: async ({url, fill}) => {
+		const user = await fetchUser(fill[0])
+		const content = user.timeline.getFeed().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
+		}
+	}}
+]

src/site/api/routes.js

@@ -1,8 +1,9 @@
+const constants = require("../../lib/constants")
 const {fetchUser} = require("../../lib/collectors")
 const {render} = require("pinski/plugins")
 
 module.exports = [
-	{route: "/u/([\\w.]+)", methods: ["GET"], code: async ({url, fill}) => {
+	{route: `/u/(${constants.external.username_regex})`, methods: ["GET"], code: async ({url, fill}) => {
 		const params = url.searchParams
 		const user = await fetchUser(fill[0])
 		const page = +params.get("page")
@@ -11,7 +12,7 @@ module.exports = [
 		}
 		return render(200, "pug/user.pug", {url, user})
 	}},
-	{route: "/fragment/user/([\\w.]+)/(\\d+)", methods: ["GET"], code: async ({url, fill}) => {
+	{route: `/fragment/user/(${constants.external.username_regex})/(\\d+)`, methods: ["GET"], code: async ({url, fill}) => {
 		const user = await fetchUser(fill[0])
 		const pageNumber = +fill[1]
 		const pageIndex = pageNumber - 1

src/site/pug/includes/image.pug

@@ -1,5 +0,0 @@
-mixin image(url)
-	-
-		let params = new URLSearchParams()
-		params.set("url", url)
-	img(src="/imageproxy?"+params.toString())&attributes(attributes)

src/site/pug/includes/timeline_page.pug

@@ -1,15 +1,14 @@
 //- Needs page, pageIndex
 
-include image.pug
-
 mixin timeline_page(page, pageIndex)
+	section.timeline-page
 		- const pageNumber = pageIndex + 1
 		if pageNumber > 1
-		.page-number(id=`page-${pageNumber}`)
+			header.page-number(id=`page-${pageNumber}`)
 				span.number Page #{pageNumber}
 
 		.timeline-inner
 			- const suggestedSize = 300
 			each image in page
 				- const thumbnail = image.getSuggestedThumbnail(suggestedSize) //- use this as the src in case there are problems with srcset
-			+image(thumbnail.src)(alt=image.getAlt() width=thumbnail.config_width height=thumbnail.config_height srcset=image.getSrcset() sizes=`${suggestedSize}px`).image
+				img(src=image.getProxy(thumbnail.src) alt=image.getAlt() width=thumbnail.config_width height=thumbnail.config_height srcset=image.getSrcset() sizes=`${suggestedSize}px`).image

src/site/pug/user.pug

@@ -16,10 +16,10 @@ html
 		.main-divider
 			header.profile-overview
 				.profile-sticky
-					+image(user.data.profile_pic_url)(width="150px" height="150px").pfp
+					img(src=user.proxyProfilePicture width="150px" height="150px" alt=`${user.data.full_name}'s profile picture.`).pfp
 					//-
-						Instagram only uses the above URL, but an HD version is also available:
-						+image(user.data.profile_pic_url_hd)
+						Instagram only uses the above URL, but an HD version is also available.
+						The alt text is pathetic, I know. I don't have much to work with.
 					h1.full-name= user.data.full_name
 					h2.username= `@${user.data.username}`
 					p.bio= user.data.biography
@@ -35,6 +35,8 @@ html
 						span(data-numberformat=user.followedBy).count #{numberFormat(user.followedBy)}
 						|
 						| followed by
+					div.links
+						a(rel="alternate" type="application/rss+xml" href=`/u/${user.data.username}/rss.xml`) RSS
 
 			main#timeline.timeline
 				each page, pageIndex in user.timeline.pages

src/site/sass/main.sass

@@ -71,6 +71,9 @@ body
 		.count
 			font-weight: bold
 
+	.links
+		margin-top: 20px
+
 .timeline
 	--image-size: 260px
 	$image-size: var(--image-size)