Convert @room to @everyone using permissions

m2d/actions/channel-webhook.js

@@ -57,7 +57,7 @@ async function withWebhook(channelID, callback) {
  */
 async function sendMessageWithWebhook(channelID, data, threadID) {
 	const result = await withWebhook(channelID, async webhook => {
-		return discord.snow.webhook.executeWebhook(webhook.id, webhook.token, data, {wait: true, thread_id: threadID, disableEveryone: true})
+		return discord.snow.webhook.executeWebhook(webhook.id, webhook.token, data, {wait: true, thread_id: threadID})
 	})
 	return result
 }

m2d/converters/event-to-message.js

@@ -384,19 +384,35 @@ async function handleRoomOrMessageLinks(input, di) {
 
 /**
  * @param {string} content
+ * @param {string} senderMxid
+ * @param {string} roomID
  * @param {DiscordTypes.APIGuild} guild
  * @param {{api: import("../../matrix/api"), snow: import("snowtransfer").SnowTransfer, fetch: import("node-fetch")["default"]}} di
  */
-async function checkWrittenMentions(content, guild, di) {
+async function checkWrittenMentions(content, senderMxid, roomID, guild, di) {
 	let writtenMentionMatch = content.match(/(?:^|[^"[<>/A-Za-z0-9])@([A-Za-z][A-Za-z0-9._\[\]\(\)-]+):?/d) // /d flag for indices requires node.js 16+
 	if (writtenMentionMatch) {
+		if (writtenMentionMatch[1] === "room") { // convert @room to @everyone
+			const powerLevels = await di.api.getStateEvent(roomID, "m.room.power_levels", "")
+			const userPower = powerLevels.users?.[senderMxid] || 0
+			if (userPower >= powerLevels.notifications?.room) {
+				return {
+					// @ts-ignore - typescript doesn't know about indices yet
+					content: content.slice(0, writtenMentionMatch.indices[1][0]-1) + `@everyone` + content.slice(writtenMentionMatch.indices[1][1]),
+					ensureJoined: [],
+					allowedMentionsParse: ["everyone"]
+				}
+			}
+		} else {
 			const results = await di.snow.guild.searchGuildMembers(guild.id, {query: writtenMentionMatch[1]})
 			if (results[0]) {
 				assert(results[0].user)
 				return {
 					// @ts-ignore - typescript doesn't know about indices yet
 					content: content.slice(0, writtenMentionMatch.indices[1][0]-1) + `<@${results[0].user.id}>` + content.slice(writtenMentionMatch.indices[1][1]),
-				ensureJoined: results[0].user
+					ensureJoined: [results[0].user],
+					allowedMentionsParse: []
+				}
 			}
 		}
 	}
@@ -427,6 +443,7 @@ const attachmentEmojis = new Map([
 async function eventToMessage(event, guild, di) {
 	let displayName = event.sender
 	let avatarURL = undefined
+	const allowedMentionsParse = ["users", "roles"]
 	/** @type {string[]} */
 	let messageIDsToEdit = []
 	let replyLine = ""
@@ -656,10 +673,11 @@ async function eventToMessage(event, guild, di) {
 				for (; node; node = node.nextSibling) {
 					// Check written mentions
 					if (node.nodeType === 3 && node.nodeValue.includes("@") && !nodeIsChildOf(node, ["A", "CODE", "PRE"])) {
-						const result = await checkWrittenMentions(node.nodeValue, guild, di)
+						const result = await checkWrittenMentions(node.nodeValue, event.sender, event.room_id, guild, di)
 						if (result) {
 							node.nodeValue = result.content
-							ensureJoined.push(result.ensureJoined)
+							ensureJoined.push(...result.ensureJoined)
+							allowedMentionsParse.push(...result.allowedMentionsParse)
 						}
 					}
 					// Check for incompatible backticks in code blocks
@@ -727,10 +745,11 @@ async function eventToMessage(event, guild, di) {
 			content = await handleRoomOrMessageLinks(content, di) // Replace matrix.to links with discord.com equivalents where possible
 			content = content.replace(/\bhttps?:\/\/matrix\.to\/[^ )]*/, "<$&>") // Put < > around any surviving matrix.to links to hide the URL previews
 
-			const result = await checkWrittenMentions(content, guild, di)
+			const result = await checkWrittenMentions(content, event.sender, event.room_id, guild, di)
 			if (result) {
 				content = result.content
-				ensureJoined.push(result.ensureJoined)
+				ensureJoined.push(...result.ensureJoined)
+				allowedMentionsParse.push(...result.allowedMentionsParse)
 			}
 
 			// Markdown needs to be escaped, though take care not to escape the middle of links
@@ -787,7 +806,7 @@ async function eventToMessage(event, guild, di) {
 	const messages = chunks.map(content => ({
 		content,
 		allowed_mentions: {
-			parse: ["users", "roles"]
+			parse: allowedMentionsParse
 		},
 		username: displayNameShortened,
 		avatar_url: avatarURL

m2d/converters/event-to-message.test.js

@@ -3786,6 +3786,174 @@ test("event2message: guessed @mentions work with other matrix bridge old users",
 	)
 })
 
+test("event2message: @room converts to @everyone and is allowed when the room doesn't restrict who can use it (plaintext body)", async t => {
+	let called = 0
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "@room dinner's ready",
+			},
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe",
+			event_id: "$SiXetU9h9Dg-M9Frcw_C6ahnoXZ3QPZe3MVJR5tcB9A"
+		}, data.guild.general, {
+			api: {
+				getStateEvent(roomID, type, key) {
+					called++
+					t.equal(roomID, "!kLRqKKUQXcibIMtOpl:cadence.moe")
+					t.equal(type, "m.room.power_levels")
+					t.equal(key, "")
+					return {
+						users: {},
+						notifications: {
+							room: 0
+						}
+					}
+				}
+			}
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "@everyone dinner's ready",
+				avatar_url: undefined,
+				allowed_mentions: {
+					parse: ["users", "roles", "everyone"]
+				}
+			}],
+			ensureJoined: []
+		}
+	)
+})
+
+test("event2message: @room converts to @everyone but is not allowed when the room restricts who can use it", async t => {
+	let called = 0
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "wrong body",
+				format: "org.matrix.custom.html",
+				formatted_body: "@room dinner's ready"
+			},
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe",
+			event_id: "$SiXetU9h9Dg-M9Frcw_C6ahnoXZ3QPZe3MVJR5tcB9A"
+		}, data.guild.general, {
+			api: {
+				getStateEvent(roomID, type, key) {
+					called++
+					t.equal(roomID, "!kLRqKKUQXcibIMtOpl:cadence.moe")
+					t.equal(type, "m.room.power_levels")
+					t.equal(key, "")
+					return {
+						users: {},
+						notifications: {
+							room: 20
+						}
+					}
+				}
+			}
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "@room dinner's ready",
+				avatar_url: undefined,
+				allowed_mentions: {
+					parse: ["users", "roles"]
+				}
+			}],
+			ensureJoined: []
+		}
+	)
+})
+
+test("event2message: @room converts to @everyone and is allowed if the user has sufficient power to use it", async t => {
+	let called = 0
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "wrong body",
+				format: "org.matrix.custom.html",
+				formatted_body: "@room dinner's ready"
+			},
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe",
+			event_id: "$SiXetU9h9Dg-M9Frcw_C6ahnoXZ3QPZe3MVJR5tcB9A"
+		}, data.guild.general, {
+			api: {
+				getStateEvent(roomID, type, key) {
+					called++
+					t.equal(roomID, "!kLRqKKUQXcibIMtOpl:cadence.moe")
+					t.equal(type, "m.room.power_levels")
+					t.equal(key, "")
+					return {
+						users: {
+							"@cadence:cadence.moe": 20
+						},
+						notifications: {
+							room: 20
+						}
+					}
+				}
+			}
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "@everyone dinner's ready",
+				avatar_url: undefined,
+				allowed_mentions: {
+					parse: ["users", "roles", "everyone"]
+				}
+			}],
+			ensureJoined: []
+		}
+	)
+})
+
+test("event2message: @room in the middle of a link is not converted", async t => {
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "wrong body",
+				format: "org.matrix.custom.html",
+				formatted_body: `<a href="https://github.com/@room/repositories">https://github.com/@room/repositories</a> https://github.com/@room/repositories`
+			},
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe",
+			event_id: "$SiXetU9h9Dg-M9Frcw_C6ahnoXZ3QPZe3MVJR5tcB9A"
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "https://github.com/@room/repositories https://github.com/@room/repositories",
+				avatar_url: undefined,
+				allowed_mentions: {
+					parse: ["users", "roles"]
+				}
+			}],
+			ensureJoined: []
+		}
+	)
+})
+
 slow()("event2message: unknown emoji at the end is reuploaded as a sprite sheet", async t => {
 	const messages = await eventToMessage({
 		type: "m.room.message",