package-lock.json

@@ -2013,6 +2013,11 @@
         "domelementtype": "1"
       }
     },
+    "dompurify": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-2.2.0.tgz",
+      "integrity": "sha512-bqFOQ7XRmmozp0VsKdIEe8UwZYxj0yttz7l80GBtBqdVRY48cOpXH2J/CVO7AEkV51qY0EBVXfilec18mdmQ/w=="
+    },
     "domutils": {
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.5.1.tgz",

package.json

@@ -11,7 +11,9 @@
   "keywords": [],
   "author": "",
   "license": "AGPL-3.0-only",
-  "dependencies": {},
+  "dependencies": {
+    "dompurify": "^2.2.0"
+  },
   "devDependencies": {
     "@babel/core": "^7.11.1",
     "@babel/preset-env": "^7.11.0",

src/js/dateFormatter.js

@@ -0,0 +1,3 @@
+const dateFormatter = Intl.DateTimeFormat("default", {hour: "numeric", minute: "numeric", day: "numeric", month: "short", year: "numeric"})
+
+module.exports = {dateFormatter}

src/js/events/encrypted.js

@@ -0,0 +1,18 @@
+const {Event} = require("./event")
+
+class EncryptedMessage extends Event {
+	render() {
+		super.render()
+		return this.text("Carbon cannot render encrypted messages yet")
+	}
+
+	static canRender(event) {
+		return event.type == "m.room.encrypted"
+	}
+
+	canGroup() {
+		return true
+	}
+}
+
+module.exports = [EncryptedMessage]

src/js/events/event.js

@@ -0,0 +1,59 @@
+const {ElemJS, ejs} = require("../basic")
+const {dateFormatter} = require("../dateFormatter")
+
+class Event extends ElemJS {
+	constructor(data) {
+		super("div")
+		this.class("c-message")
+		this.data = null
+		this.group = null
+		this.editedAt = null
+		this.update(data)
+	}
+
+	// predicates
+
+	canGroup() {
+		//return this.data.type === "m.room.message"
+		return false
+	}
+
+	// operations
+
+	setGroup(group) {
+		this.group = group
+	}
+
+	setEdited(time) {
+		this.editedAt = time
+		this.render()
+	}
+
+	update(data) {
+		this.data = data
+		this.render()
+	}
+
+	removeEvent() {
+		if (this.group) this.group.removeEvent(this)
+		else this.remove()
+	}
+
+	render() {
+		this.element.classList[this.data.pending ? "add" : "remove"]("c-message--pending")
+		if (this.editedAt) {
+			this.child(ejs("span").class("c-message__edited").text("(edited)").attribute("title", "at " + dateFormatter.format(this.editedAt)))
+		}
+	}
+	static canRender(_event) {
+		return false
+	}
+}
+
+
+
+function renderEvent(event) {
+	return new events.find(e => e.canRender(event))(event)
+}
+
+module.exports = {renderEvent, Event}

src/js/events/membership.js

@@ -0,0 +1,21 @@
+const {Event} = require("./event")
+
+function createMembershipEvent(membership, text) {
+	return class extends Event {
+		render() {
+			super.render()
+			return this.text(text(this.data))
+		}
+
+		static canRender(event) {
+			return event.type == "m.room.member" && event.content.membership == membership
+		}
+
+	}
+}
+
+const JoinedEvent = createMembershipEvent("join", () => "joined the room")
+const InvitedEvent = createMembershipEvent("invite", (e) => `invited ${e.content.displayname} the room`)
+const LeaveEvent = createMembershipEvent("leave", () => "left the room")
+
+module.exports = [JoinedEvent, InvitedEvent, LeaveEvent]

src/js/events/message.js

@@ -0,0 +1,67 @@
+const {ejs} = require("../basic")
+const DOMPurify = require("dompurify")
+const {resolveMxc} = require("../functions")
+const {Event} = require("./event")
+
+const purifier = DOMPurify()
+purifier.addHook("afterSanitizeAttributes", (node, hookevent, config) => {
+	if (node.tagName == "img") {
+		let src = node.getAttribute("src")
+		if (src) src = resolveMxc(src)
+
+		node.setAttribute("src", src)
+
+	}
+	if (node.tagName = "a") {
+		node.setAttribute("rel", "noopener")
+	}
+	return node
+
+})
+
+function sanitize(html) {
+	return purifier.sanitize(html, DOMPURIFY_CONFIG)
+}
+const DOMPURIFY_CONFIG = {
+	ALLOWED_URI_REGEXP: /^mxc:\/\/[a-zA-Z0-9\.]+\/[a-zA-Z0-9]+$/, // As per the spec we only allow mxc uris
+	ALLOWED_TAGS: ['font', 'del', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'blockquote', 'p', 'a', 'ul', 'ol', 'sup', 'sub', 'li', 'b', 'i', 'u', 'strong', 'em', 'strike', 'code', 'hr', 'br', 'div', 'table', 'thead', 'tbody', 'tr', 'th', 'td', 'caption', 'pre', 'span', 'img'],
+};
+
+class HTMLMessage extends Event {
+	render() {
+		super.render()
+		let html = this.data.content.formatted_body
+		const content = ejs("div")
+		html = sanitize(html)
+		content.html(html)
+		this.child(content)
+	}
+
+	static canRender(event) {
+		const content = event.content
+		return event.type == "m.room.message" && content.msgtype == "m.text" && content.format == "org.matrix.custom.html" && content.formatted_body
+
+	}
+
+	canGroup() {
+		return true
+	}
+
+}
+
+class TextMessage extends Event {
+	render() {
+		super.render()
+		return this.text(this.data.content.body)
+	}
+
+	static canRender(event) {
+		return event.type == "m.room.message"
+	}
+
+	canGroup() {
+		return true
+	}
+}
+
+module.exports = [HTMLMessage, TextMessage]

src/js/events/renderEvent.js

@@ -0,0 +1,19 @@
+const messageEvent = require("./message")
+const encryptedEvent = require("./encrypted")
+const membershipEvent = require("./membership")
+const unknownEvent = require("./unknown")
+
+const events = [
+	...messageEvent,
+	...encryptedEvent,
+	...membershipEvent,
+	...unknownEvent,
+]
+
+
+function renderEvent(eventData) {
+	const constructor = events.find(e => e.canRender(eventData))
+	return new constructor(eventData)
+}
+
+module.exports = {renderEvent}

src/js/events/unknown.js

@@ -0,0 +1,15 @@
+const {Event} = require("./event")
+
+class UnknownEvent extends Event {
+	render() {
+		super.render()
+		this.text("Cannot render event")
+	}
+
+	static canRender(_event) {
+		return true
+	}
+
+}
+
+module.exports = [UnknownEvent]

src/js/timeline.js

@@ -4,13 +4,13 @@ const {store} = require("./store/store.js")
 const {Anchor} = require("./anchor.js")
 const lsm = require("./lsm.js")
 const {resolveMxc} = require("./functions.js")
+const {renderEvent} = require("./events/renderEvent")
+const {dateFormatter} = require("./dateFormatter")
 
 let debug = false
 
 const NO_MAX = Symbol("NO_MAX")
 
-const dateFormatter = Intl.DateTimeFormat("default", {hour: "numeric", minute: "numeric", day: "numeric", month: "short", year: "numeric"})
-
 let sentIndex = 0
 
 function getTxnId() {
@@ -38,67 +38,6 @@ function eventSearch(list, event, min = 0, max = NO_MAX) {
 	else return eventSearch(list, event, mid + 1, max)
 }
 
-class Event extends ElemJS {
-	constructor(data) {
-		super("div")
-		this.class("c-message")
-		this.data = null
-		this.group = null
-		this.editedAt = null
-		this.update(data)
-	}
-
-	// predicates
-
-	canGroup() {
-		return this.data.type === "m.room.message"
-	}
-
-	// operations
-
-	setGroup(group) {
-		this.group = group
-	}
-
-	setEdited(time) {
-		this.editedAt = time
-		this.render()
-	}
-
-	update(data) {
-		this.data = data
-		this.render()
-	}
-
-	removeEvent() {
-		if (this.group) this.group.removeEvent(this)
-		else this.remove()
-	}
-
-	render() {
-		this.element.classList[this.data.pending ? "add" : "remove"]("c-message--pending")
-		if (this.data.type === "m.room.message") {
-			this.text(this.data.content.body)
-		} else if (this.data.type === "m.room.member") {
-			if (this.data.content.membership === "join") {
-				this.child(ejs("i").text("joined the room"))
-			} else if (this.data.content.membership === "invite") {
-				this.child(ejs("i").text(`invited ${this.data.content.displayname} to the room`))
-			} else if (this.data.content.membership === "leave") {
-				this.child(ejs("i").text("left the room"))
-			} else {
-				this.child(ejs("i").text("unknown membership event"))
-			}
-		} else if (this.data.type === "m.room.encrypted") {
-			this.child(ejs("i").text("Carbon does not yet support encrypted messages."))
-		} else {
-			this.child(ejs("i").text(`Unsupported event type ${this.data.type}`))
-		}
-		if (this.editedAt) {
-			this.child(ejs("span").class("c-message__edited").text("(edited)").attribute("title", "at " + dateFormatter.format(this.editedAt)))
-		}
-	}
-}
 
 class Sender {
 	constructor(roomID, mxid) {
@@ -345,7 +284,7 @@ class Timeline extends Subscribable {
 					continue
 				}
 				// add new event
-				const event = new Event(eventData)
+				const event = renderEvent(eventData)
 				this.map.set(id, event)
 				this.reactiveTimeline.addEvent(event)
 			}