From aa263d3eb84a8250847ecd063089f7d71fee36e1 Mon Sep 17 00:00:00 2001
From: Cadence Ember <cadence@disroot.org>
Date: Sun, 3 Sep 2023 16:38:54 +1200
Subject: [PATCH 1/6] m->d avoid using blockquote as reply preview

---
 m2d/converters/event-to-message.js      |  2 +-
 m2d/converters/event-to-message.test.js | 49 +++++++++++++++++++++++++
 notes.md                                |  7 ++--
 3 files changed, 53 insertions(+), 5 deletions(-)

diff --git a/m2d/converters/event-to-message.js b/m2d/converters/event-to-message.js
index 5ad62c1..1eb1be2 100644
--- a/m2d/converters/event-to-message.js
+++ b/m2d/converters/event-to-message.js
@@ -210,7 +210,7 @@ async function eventToMessage(event, guild, di) {
 				replyLine += `Ⓜ️**${senderName}**:`
 			}
 			const repliedToContent = repliedToEvent.content.formatted_body || repliedToEvent.content.body
-			const contentPreviewChunks = chunk(repliedToContent.replace(/.*<\/mx-reply>/, "").replace(/(?:\n|<br>)+/g, " ").replace(/<[^>]+>/g, ""), 50)
+			const contentPreviewChunks = chunk(repliedToContent.replace(/.*<\/mx-reply>/, "").replace(/.*?<\/blockquote>/, "").replace(/(?:\n|<br>)+/g, " ").replace(/<[^>]+>/g, ""), 50)
 			const contentPreview = contentPreviewChunks.length > 1 ? contentPreviewChunks[0] + "..." : contentPreviewChunks[0]
 			replyLine = `> ${replyLine}\n> ${contentPreview}\n`
 		})()
diff --git a/m2d/converters/event-to-message.test.js b/m2d/converters/event-to-message.test.js
index 565d8c4..e9061b7 100644
--- a/m2d/converters/event-to-message.test.js
+++ b/m2d/converters/event-to-message.test.js
@@ -535,6 +535,55 @@ test("event2message: rich reply to a sim user", async t => {
 	)
 })
 
+test("event2message: should avoid using blockquote contents as reply preview in rich reply to a sim user", async t => {
+	t.deepEqual(
+		await eventToMessage({
+		type: "m.room.message",
+		sender: "@cadence:cadence.moe",
+		content: {
+			msgtype: "m.text",
+			body: "> <@_ooye_kyuugryphon:cadence.moe> > well, you said this, so...\n> \n> that can't be true! there's no way :o\n\nI agree!",
+			format: "org.matrix.custom.html",
+			formatted_body: "<mx-reply><blockquote><a href=\"https://matrix.to/#/!fGgIymcYWOqjbSRUdV:cadence.moe/$Fxy8SMoJuTduwReVkHZ1uHif9EuvNx36Hg79cltiA04?via=cadence.moe\">In reply to</a> <a href=\"https://matrix.to/#/@_ooye_kyuugryphon:cadence.moe\">@_ooye_kyuugryphon:cadence.moe</a><br><blockquote>well, you said this, so...<br /></blockquote><br />that can't be true! there's no way :o</blockquote></mx-reply>I agree!",
+			"m.relates_to": {
+				"m.in_reply_to": {
+					event_id: "$Fxy8SMoJuTduwReVkHZ1uHif9EuvNx36Hg79cltiA04"
+				}
+			}
+		},
+		event_id: "$BpGx8_vqHyN6UQDARPDU51ftrlRBhleutRSgpAJJ--g",
+		room_id: "!fGgIymcYWOqjbSRUdV:cadence.moe"
+		}, data.guild.general, {
+			api: {
+				getEvent: mockGetEvent(t, "!fGgIymcYWOqjbSRUdV:cadence.moe", "$Fxy8SMoJuTduwReVkHZ1uHif9EuvNx36Hg79cltiA04", {
+					"type": "m.room.message",
+					"sender": "@_ooye_kyuugryphon:cadence.moe",
+					"content": {
+						"m.mentions": {},
+						"msgtype": "m.text",
+						"body": "> well, you said this, so...\n\nthat can't be true! there's no way :o",
+						"format": "org.matrix.custom.html",
+						"formatted_body": "<blockquote>well, you said this, so...<br></blockquote><br>that can't be true! there's no way :o"
+					}
+				})
+			}
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "> <:L1:1144820033948762203><:L2:1144820084079087647>https://discord.com/channels/112760669178241024/687028734322147344/1144865310588014633 <@111604486476181504>:"
+					+ "\n> that can't be true! there's no way :o"
+					+ "\nI agree!",
+				avatar_url: "https://matrix.cadence.moe/_matrix/media/r0/download/cadence.moe/azCAhThKTojXSZJRoWwZmhvU"
+			}]
+		}
+	)
+})
+
+
+
 test("event2message: editing a rich reply to a sim user", async t => {
 	const eventsFetched = []
 	t.deepEqual(
diff --git a/notes.md b/notes.md
index 0b6b088..458e3bd 100644
--- a/notes.md
+++ b/notes.md
@@ -2,14 +2,13 @@
 
 ## Known issues
 
-- m->d attachments do not work
-- m->d replying to a message that used a blockquote should avoid using the blockquote contents as the preview
 - d->m emojis do not work at all (inline chat, single emoji size, reactions, bridged state)
+- d->m embeds
 - m->d code blocks have slightly too much spacing
-- m->d some reactions don't work because of the variation selector
 - d->m check whether I implemented deletions
 - m->d deletions
-- rooms will be set up even if the bridge does not have permission for them, then break when it restarts and tries to reach messages
+- removing reactions
+- rooms will be set up even if the bridge does not have permission for the channels, which breaks when it restarts and tries to fetch messages
 	- test private threads as part of this
 	- solution part 1: calculate the permissions to see if the bot should be able to do stuff
 	- solution part 2: attempt a get messages request anyway before bridging a new room, just to make sure!

From 5e6bb0cd2edaa8c340b5f27d5ccfce622c22fc8e Mon Sep 17 00:00:00 2001
From: Cadence Ember <cadence@disroot.org>
Date: Sun, 3 Sep 2023 17:13:04 +1200
Subject: [PATCH 2/6] create syncSpaceFully

---
 d2m/actions/create-room.js  |  5 ++++-
 d2m/actions/create-space.js | 43 +++++++++++++++++++++++++++++++++----
 2 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/d2m/actions/create-room.js b/d2m/actions/create-room.js
index e778d22..e6e2cbe 100644
--- a/d2m/actions/create-room.js
+++ b/d2m/actions/create-room.js
@@ -82,7 +82,7 @@ async function channelToKState(channel, guild) {
 		avatarEventContent.url = await file.uploadDiscordFileToMxc(avatarEventContent.discord_path) // TODO: somehow represent future values in kstate (callbacks?), while still allowing for diffing, so test cases don't need to touch the media API
 	}
 
-	let history_visibility = "invited"
+	let history_visibility = "shared"
 	if (channel["thread_metadata"]) history_visibility = "world_readable"
 
 	const channelKState = {
@@ -106,6 +106,9 @@ async function channelToKState(channel, guild) {
 			events: {
 				"m.room.avatar": 0
 			}
+		},
+		"chat.schildi.hide_ui/read_receipts": {
+			hidden: true
 		}
 	}
 
diff --git a/d2m/actions/create-space.js b/d2m/actions/create-space.js
index 87e25eb..2c86f75 100644
--- a/d2m/actions/create-space.js
+++ b/d2m/actions/create-space.js
@@ -67,6 +67,7 @@ async function guildToKState(guild) {
 	return guildKState
 }
 
+/** Efficiently update space name, space avatar, and child room avatars. */
 async function syncSpace(guildID) {
 	/** @ts-ignore @type {DiscordTypes.APIGuild} */
 	const guild = discord.guilds.get(guildID)
@@ -77,10 +78,7 @@ async function syncSpace(guildID) {
 
 	const guildKState = await guildToKState(guild)
 
-	if (!spaceID) {
-		const spaceID = await createSpace(guild, guildKState)
-		return spaceID // Naturally, the newly created space is already up to date, so we can always skip syncing here.
-	}
+	if (!spaceID) return
 
 	console.log(`[space sync] to matrix: ${guild.name}`)
 
@@ -111,6 +109,43 @@ async function syncSpace(guildID) {
 	return spaceID
 }
 
+/**
+ * Inefficiently force the space and its existing child rooms to be fully updated.
+ * Should not need to be called as part of the bridge's normal operation.
+ */
+async function syncSpaceFully(guildID) {
+	/** @ts-ignore @type {DiscordTypes.APIGuild} */
+	const guild = discord.guilds.get(guildID)
+	assert.ok(guild)
+
+	/** @type {string?} */
+	const spaceID = db.prepare("SELECT space_id from guild_space WHERE guild_id = ?").pluck().get(guildID)
+
+	const guildKState = await guildToKState(guild)
+
+	if (!spaceID) return
+
+	console.log(`[space sync] to matrix: ${guild.name}`)
+
+	// sync guild state to space
+	const spaceKState = await createRoom.roomToKState(spaceID)
+	const spaceDiff = ks.diffKState(spaceKState, guildKState)
+	await createRoom.applyKStateDiffToRoom(spaceID, spaceDiff)
+
+	const childRooms = ks.kstateToState(spaceKState).filter(({type, content}) => {
+		return type === "m.space.child" && "via" in content
+	}).map(({state_key}) => state_key)
+
+	for (const roomID of childRooms) {
+		const channelID = db.prepare("SELECT channel_id FROM channel_room WHERE room_id = ?").pluck().get(roomID)
+		if (!channelID) continue
+		await createRoom.syncRoom(channelID)
+	}
+
+	return spaceID
+}
+
 module.exports.createSpace = createSpace
 module.exports.syncSpace = syncSpace
+module.exports.syncSpaceFully = syncSpaceFully
 module.exports.guildToKState = guildToKState

From d3f637d7cee71b9c37f334c7c04e605cb6169a6b Mon Sep 17 00:00:00 2001
From: Cadence Ember <cadence@disroot.org>
Date: Mon, 4 Sep 2023 01:36:35 +1200
Subject: [PATCH 3/6] properly support guild update events

---
 d2m/discord-packets.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/d2m/discord-packets.js b/d2m/discord-packets.js
index 6ece8ca..b2fb643 100644
--- a/d2m/discord-packets.js
+++ b/d2m/discord-packets.js
@@ -43,6 +43,15 @@ const utils = {
 			}
 			eventDispatcher.checkMissedMessages(client, message.d)
 
+		} else if (message.t === "GUILD_UPDATE") {
+			const guild = client.guilds.get(message.d.id)
+			if (guild) {
+				for (const prop of Object.keys(message.d)) {
+					if (!["channels", "threads"].includes(prop)) {
+						guild[prop] = message.d[prop]
+					}
+				}
+			}
 
 		} else if (message.t === "THREAD_CREATE") {
 			client.channels.set(message.d.id, message.d)

From d255f2ab22402293cd23e67ac9921bd7111d9e4e Mon Sep 17 00:00:00 2001
From: Cadence Ember <cadence@disroot.org>
Date: Mon, 4 Sep 2023 01:36:58 +1200
Subject: [PATCH 4/6] fix join rules on old room versions

---
 d2m/actions/create-room.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/d2m/actions/create-room.js b/d2m/actions/create-room.js
index e6e2cbe..679c0de 100644
--- a/d2m/actions/create-room.js
+++ b/d2m/actions/create-room.js
@@ -95,6 +95,7 @@ async function channelToKState(channel, guild) {
 			via: [reg.ooye.server_name],
 			canonical: true
 		},
+		/** @type {{join_rule: string, [x: string]: any}} */
 		"m.room.join_rules/": {
 			join_rule: "restricted",
 			allow: [{
@@ -255,6 +256,12 @@ async function _syncRoom(channelID, shouldActuallySync) {
 
 	// sync channel state to room
 	const roomKState = await roomToKState(roomID)
+	if (+roomKState["m.room.create/"].room_version <= 8) {
+		// join_rule `restricted` is not available in room version < 8 and not working properly in version == 8
+		// read more: https://spec.matrix.org/v1.8/rooms/v9/
+		// we have to use `public` instead, otherwise the room will be unjoinable.
+		channelKState["m.room.join_rules/"] = {join_rule: "public"}
+	}
 	const roomDiff = ks.diffKState(roomKState, channelKState)
 	const roomApply = applyKStateDiffToRoom(roomID, roomDiff)
 	db.prepare("UPDATE channel_room SET name = ? WHERE room_id = ?").run(channel.name, roomID)

From 5185ae45ab7ec7364b3160d65c26cc7dc2102173 Mon Sep 17 00:00:00 2001
From: Cadence Ember <cadence@disroot.org>
Date: Mon, 4 Sep 2023 01:37:33 +1200
Subject: [PATCH 5/6] m->d fix a few markdown escaping problems

---
 m2d/converters/event-to-message.js      | 43 +++++++++++++--
 m2d/converters/event-to-message.test.js | 72 ++++++++++++++++++++++---
 2 files changed, 105 insertions(+), 10 deletions(-)

diff --git a/m2d/converters/event-to-message.js b/m2d/converters/event-to-message.js
index 1eb1be2..1e66c7a 100644
--- a/m2d/converters/event-to-message.js
+++ b/m2d/converters/event-to-message.js
@@ -22,13 +22,48 @@ const BLOCK_ELEMENTS = [
 	"TFOOT", "TH", "THEAD", "TR", "UL"
 ]
 
+/** @type {[RegExp, string][]} */
+const markdownEscapes = [
+	[/\\/g, '\\\\'],
+	[/\*/g, '\\*'],
+	[/^-/g, '\\-'],
+	[/^\+ /g, '\\+ '],
+	[/^(=+)/g, '\\$1'],
+	[/^(#{1,6}) /g, '\\$1 '],
+	[/`/g, '\\`'],
+	[/^~~~/g, '\\~~~'],
+	[/\[/g, '\\['],
+	[/\]/g, '\\]'],
+	[/^>/g, '\\>'],
+	[/_/g, '\\_'],
+	[/^(\d+)\. /g, '$1\\. ']
+ ]
+
 const turndownService = new TurndownService({
 	hr: "----",
 	headingStyle: "atx",
 	preformattedCode: true,
-	codeBlockStyle: "fenced"
+	codeBlockStyle: "fenced",
 })
 
+/**
+ * Markdown characters in the HTML content need to be escaped, though take care not to escape the middle of bare links
+ * @param {string} string
+ */
+// @ts-ignore bad type from turndown
+turndownService.escape = function (string) {
+	const escapedWords = string.split(" ").map(word => {
+		if (word.match(/^https?:\/\//)) {
+			return word
+		} else {
+			return markdownEscapes.reduce(function (accumulator, escape) {
+				return accumulator.replace(escape[0], escape[1])
+		 	}, word)
+		}
+	})
+	return escapedWords.join(" ")
+}
+
 turndownService.remove("mx-reply")
 
 turndownService.addRule("strikethrough", {
@@ -67,7 +102,6 @@ turndownService.addRule("spoiler", {
 turndownService.addRule("inlineLink", {
 	filter: function (node, options) {
 		return (
-			options.linkStyle === "inlined" &&
 			node.nodeName === "A" &&
 			node.getAttribute("href")
 		)
@@ -275,8 +309,9 @@ async function eventToMessage(event, guild, di) {
 				content = `* ${displayName} ${content}`
 			}
 
-			// Markdown needs to be escaped
-			content = content.replace(/([*_~`#])/g, `\\$1`)
+			// Markdown needs to be escaped, though take care not to escape the middle of links
+			// @ts-ignore bad type from turndown
+			content = turndownService.escape(content)
 		}
 	} else if (event.type === "m.room.message" && (event.content.msgtype === "m.file" || event.content.msgtype === "m.video" || event.content.msgtype === "m.audio" || event.content.msgtype === "m.image")) {
 		content = ""
diff --git a/m2d/converters/event-to-message.test.js b/m2d/converters/event-to-message.test.js
index e9061b7..e7f28d4 100644
--- a/m2d/converters/event-to-message.test.js
+++ b/m2d/converters/event-to-message.test.js
@@ -64,11 +64,11 @@ test("event2message: body is used when there is no formatted_body", async t => {
 	)
 })
 
-test("event2message: any markdown in body is escaped", async t => {
+test("event2message: any markdown in body is escaped, except strikethrough", async t => {
 	t.deepEqual(
 		await eventToMessage({
 			content: {
-				body: "testing **special** ~~things~~ which _should_ *not* `trigger` @any <effects>",
+				body: "testing **special** ~~things~~ which _should_ *not* `trigger` @any <effects>, except strikethrough",
 				msgtype: "m.text"
 			},
 			event_id: "$g07oYSZFWBkxohNEfywldwgcWj1hbhDzQ1sBAKvqOOU",
@@ -85,7 +85,67 @@ test("event2message: any markdown in body is escaped", async t => {
 			messagesToEdit: [],
 			messagesToSend: [{
 				username: "cadence [they]",
-				content: "testing \\*\\*special\\*\\* \\~\\~things\\~\\~ which \\_should\\_ \\*not\\* \\`trigger\\` @any <effects>",
+				content: "testing \\*\\*special\\*\\* ~~things~~ which \\_should\\_ \\*not\\* \\`trigger\\` @any <effects>, except strikethrough",
+				avatar_url: undefined
+			}]
+		}
+	)
+})
+
+test("event2message: links in formatted body are not broken", async t => {
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "kyuugryphon I wonder what the midjourney text description of this photo is https://upload.wikimedia.org/wikipedia/commons/f/f3/After_gay_pride%2C_rainbow_flags_flying_along_Beach_Street_%2814853144744%29.jpg",
+				format: "org.matrix.custom.html",
+				formatted_body: "<a href=\"https://matrix.to/#/@_ooye_kyuugryphon:cadence.moe\">kyuugryphon</a> I wonder what the midjourney text description of this photo is https://upload.wikimedia.org/wikipedia/commons/f/f3/After_gay_pride%2C_rainbow_flags_flying_along_Beach_Street_%2814853144744%29.jpg"
+			},
+			origin_server_ts: 1693739630700,
+			unsigned: {
+				age: 39,
+				transaction_id: "m1693739630587.160"
+			},
+			event_id: "$zANQGOdnHKZj48lrajojsejH86KNYST26imgb2Sw1Jg",
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe"
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "<@111604486476181504> I wonder what the midjourney text description of this photo is https://upload.wikimedia.org/wikipedia/commons/f/f3/After_gay_pride%2C_rainbow_flags_flying_along_Beach_Street_%2814853144744%29.jpg",
+				avatar_url: undefined
+			}]
+		}
+	)
+})
+
+test("event2message: links in plaintext body are not broken", async t => {
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "I wonder what the midjourney text description of this photo is https://upload.wikimedia.org/wikipedia/commons/f/f3/After_gay_pride%2C_rainbow_flags_flying_along_Beach_Street_%2814853144744%29.jpg",
+			},
+			origin_server_ts: 1693739630700,
+			unsigned: {
+				age: 39,
+				transaction_id: "m1693739630587.160"
+			},
+			event_id: "$zANQGOdnHKZj48lrajojsejH86KNYST26imgb2Sw1Jg",
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe"
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "I wonder what the midjourney text description of this photo is https://upload.wikimedia.org/wikipedia/commons/f/f3/After_gay_pride%2C_rainbow_flags_flying_along_Beach_Street_%2814853144744%29.jpg",
 				avatar_url: undefined
 			}]
 		}
@@ -99,7 +159,7 @@ test("event2message: basic html is converted to markdown", async t => {
 				msgtype: "m.text",
 				body: "wrong body",
 				format: "org.matrix.custom.html",
-				formatted_body: "this <strong>is</strong> a <em><strong>test</strong> <u>of</u></em> <del>formatting</del>"
+				formatted_body: "this <strong>is</strong> a <em><strong>test</strong> <u>of</u></em> <del><em>formatting</em></del>"
 			},
 			event_id: "$g07oYSZFWBkxohNEfywldwgcWj1hbhDzQ1sBAKvqOOU",
 			origin_server_ts: 1688301929913,
@@ -115,7 +175,7 @@ test("event2message: basic html is converted to markdown", async t => {
 			messagesToEdit: [],
 			messagesToSend: [{
 				username: "cadence [they]",
-				content: "this **is** a _**test** __of___ ~~formatting~~",
+				content: "this **is** a _**test** __of___ ~~_formatting_~~",
 				avatar_url: undefined
 			}]
 		}
@@ -449,7 +509,7 @@ test("event2message: m.emote plaintext works", async t => {
 			messagesToEdit: [],
 			messagesToSend: [{
 				username: "cadence [they]",
-				content: "\\* cadence [they] tests an m.emote message",
+				content: "\\* cadence \\[they\\] tests an m.emote message",
 				avatar_url: undefined
 			}]
 		}

From 39458bd2bf09a79ea8e8fa8783d853ec071c2f11 Mon Sep 17 00:00:00 2001
From: Cadence Ember <cadence@disroot.org>
Date: Mon, 4 Sep 2023 01:38:30 +1200
Subject: [PATCH 6/6] allow migrating from old to new bridge

---
 d2m/actions/create-space.js              |  10 +-
 d2m/discord-client.js                    |   8 +-
 d2m/discord-packets.js                   |  51 +++++-----
 d2m/event-dispatcher.js                  |  20 ++--
 index.js                                 |   2 +-
 matrix/mreq.js                           |  19 ++++
 package-lock.json                        |   6 ++
 package.json                             |   1 +
 scripts/capture-message-update-events.js |   4 +-
 scripts/migrate-from-old-bridge.js       | 124 +++++++++++++++++++++++
 scripts/save-channel-names-to-db.js      |   2 +-
 test/data.js                             |   5 +-
 types.d.ts                               |   4 +
 13 files changed, 214 insertions(+), 42 deletions(-)
 create mode 100644 scripts/migrate-from-old-bridge.js

diff --git a/d2m/actions/create-space.js b/d2m/actions/create-space.js
index 2c86f75..9802d48 100644
--- a/d2m/actions/create-space.js
+++ b/d2m/actions/create-space.js
@@ -78,7 +78,10 @@ async function syncSpace(guildID) {
 
 	const guildKState = await guildToKState(guild)
 
-	if (!spaceID) return
+	if (!spaceID) {
+		const spaceID = await createSpace(guild, guildKState)
+		return spaceID // Naturally, the newly created space is already up to date, so we can always skip syncing here.
+	}
 
 	console.log(`[space sync] to matrix: ${guild.name}`)
 
@@ -123,7 +126,10 @@ async function syncSpaceFully(guildID) {
 
 	const guildKState = await guildToKState(guild)
 
-	if (!spaceID) return
+	if (!spaceID) {
+		const spaceID = await createSpace(guild, guildKState)
+		return spaceID // Naturally, the newly created space is already up to date, so we can always skip syncing here.
+	}
 
 	console.log(`[space sync] to matrix: ${guild.name}`)
 
diff --git a/d2m/discord-client.js b/d2m/discord-client.js
index 5e90d85..b1a1e81 100644
--- a/d2m/discord-client.js
+++ b/d2m/discord-client.js
@@ -12,9 +12,9 @@ const discordPackets = sync.require("./discord-packets")
 class DiscordClient {
 	/**
 	 * @param {string} discordToken
-	 * @param {boolean} listen whether to set up the event listeners for OOYE to operate
+	 * @param {string} listen "full", "half", "no" - whether to set up the event listeners for OOYE to operate
 	 */
-	constructor(discordToken, listen = true) {
+	constructor(discordToken, listen = "full") {
 		this.discordToken = discordToken
 		this.snow = new SnowTransfer(discordToken)
 		this.cloud = new CloudStorm(discordToken, {
@@ -44,8 +44,8 @@ class DiscordClient {
 		this.guilds = new Map()
 		/** @type {Map<string, Array<string>>} */
 		this.guildChannelMap = new Map()
-		if (listen) {
-			this.cloud.on("event", message => discordPackets.onPacket(this, message))
+		if (listen !== "no") {
+			this.cloud.on("event", message => discordPackets.onPacket(this, message, listen))
 		}
 		this.cloud.on("error", console.error)
 	}
diff --git a/d2m/discord-packets.js b/d2m/discord-packets.js
index b2fb643..1649e68 100644
--- a/d2m/discord-packets.js
+++ b/d2m/discord-packets.js
@@ -10,8 +10,9 @@ const utils = {
 	/**
 	 * @param {import("./discord-client")} client
 	 * @param {import("cloudstorm").IGatewayMessage} message
+	 * @param {string} listen "full", "half", "no" - whether to set up the event listeners for OOYE to operate
 	 */
-	async onPacket(client, message) {
+	async onPacket(client, message, listen) {
 		// requiring this later so that the client is already constructed by the time event-dispatcher is loaded
 		/** @type {typeof import("./event-dispatcher")} */
 		const eventDispatcher = sync.require("./event-dispatcher")
@@ -41,7 +42,9 @@ const utils = {
 				arr.push(thread.id)
 				client.channels.set(thread.id, thread)
 			}
-			eventDispatcher.checkMissedMessages(client, message.d)
+			if (listen === "full") {
+				eventDispatcher.checkMissedMessages(client, message.d)
+			}
 
 		} else if (message.t === "GUILD_UPDATE") {
 			const guild = client.guilds.get(message.d.id)
@@ -90,35 +93,37 @@ const utils = {
 		}
 
 		// Event dispatcher for OOYE bridge operations
-		try {
-			if (message.t === "GUILD_UPDATE") {
-				await eventDispatcher.onGuildUpdate(client, message.d)
+		if (listen === "full") {
+			try {
+				if (message.t === "GUILD_UPDATE") {
+					await eventDispatcher.onGuildUpdate(client, message.d)
 
-			} else if (message.t === "CHANNEL_UPDATE") {
-				await eventDispatcher.onChannelOrThreadUpdate(client, message.d, false)
+				} else if (message.t === "CHANNEL_UPDATE") {
+					await eventDispatcher.onChannelOrThreadUpdate(client, message.d, false)
 
-			} else if (message.t === "THREAD_CREATE") {
-				// @ts-ignore
-				await eventDispatcher.onThreadCreate(client, message.d)
+				} else if (message.t === "THREAD_CREATE") {
+					// @ts-ignore
+					await eventDispatcher.onThreadCreate(client, message.d)
 
-			} else if (message.t === "THREAD_UPDATE") {
-				await eventDispatcher.onChannelOrThreadUpdate(client, message.d, true)
+				} else if (message.t === "THREAD_UPDATE") {
+					await eventDispatcher.onChannelOrThreadUpdate(client, message.d, true)
 
-			} else if (message.t === "MESSAGE_CREATE") {
-				await eventDispatcher.onMessageCreate(client, message.d)
+				} else if (message.t === "MESSAGE_CREATE") {
+					await eventDispatcher.onMessageCreate(client, message.d)
 
-			} else if (message.t === "MESSAGE_UPDATE") {
-				await eventDispatcher.onMessageUpdate(client, message.d)
+				} else if (message.t === "MESSAGE_UPDATE") {
+					await eventDispatcher.onMessageUpdate(client, message.d)
 
-			} else if (message.t === "MESSAGE_DELETE") {
-				await eventDispatcher.onMessageDelete(client, message.d)
+				} else if (message.t === "MESSAGE_DELETE") {
+					await eventDispatcher.onMessageDelete(client, message.d)
 
-			} else if (message.t === "MESSAGE_REACTION_ADD") {
-				await eventDispatcher.onReactionAdd(client, message.d)
+				} else if (message.t === "MESSAGE_REACTION_ADD") {
+					await eventDispatcher.onReactionAdd(client, message.d)
+				}
+			} catch (e) {
+				// Let OOYE try to handle errors too
+				eventDispatcher.onError(client, e, message)
 			}
-		} catch (e) {
-			// Let OOYE try to handle errors too
-			eventDispatcher.onError(client, e, message)
 		}
 	}
 }
diff --git a/d2m/event-dispatcher.js b/d2m/event-dispatcher.js
index c73b95b..f20d1c7 100644
--- a/d2m/event-dispatcher.js
+++ b/d2m/event-dispatcher.js
@@ -23,10 +23,6 @@ const discordCommandHandler = sync.require("./discord-command-handler")
 
 let lastReportedEvent = 0
 
-function isGuildAllowed(guildID) {
-	return ["112760669178241024", "497159726455455754", "1100319549670301727"].includes(guildID)
-}
-
 // Grab Discord events we care about for the bridge, check them, and pass them on
 
 module.exports = {
@@ -93,12 +89,22 @@ module.exports = {
 			if (latestWasBridged) continue
 
 			/** More recent messages come first. */
-			console.log(`[check missed messages] in ${channel.id} (${guild.name} / ${channel.name}) because its last message ${channel.last_message_id} is not in the database`)
-			const messages = await client.snow.channel.getChannelMessages(channel.id, {limit: 50})
+			// console.log(`[check missed messages] in ${channel.id} (${guild.name} / ${channel.name}) because its last message ${channel.last_message_id} is not in the database`)
+			let messages
+			try {
+				messages = await client.snow.channel.getChannelMessages(channel.id, {limit: 50})
+			} catch (e) {
+				if (e.message === `{"message": "Missing Access", "code": 50001}`) { // pathetic error handling from SnowTransfer
+					console.log(`[check missed messages] no permissions to look back in channel ${channel.name} (${channel.id})`)
+					continue // Sucks.
+				} else {
+					throw e // Sucks more.
+				}
+			}
 			let latestBridgedMessageIndex = messages.findIndex(m => {
 				return prepared.get(m.id)
 			})
-			console.log(`[check missed messages] got ${messages.length} messages; last message that IS bridged is at position ${latestBridgedMessageIndex} in the channel`)
+			// console.log(`[check missed messages] got ${messages.length} messages; last message that IS bridged is at position ${latestBridgedMessageIndex} in the channel`)
 			if (latestBridgedMessageIndex === -1) latestBridgedMessageIndex = 1 // rather than crawling the ENTIRE channel history, let's just bridge the most recent 1 message to make it up to date.
 			for (let i = Math.min(messages.length, latestBridgedMessageIndex)-1; i >= 0; i--) {
 				const simulatedGatewayDispatchData = {
diff --git a/index.js b/index.js
index 447e944..26f2783 100644
--- a/index.js
+++ b/index.js
@@ -13,7 +13,7 @@ Object.assign(passthrough, {config, sync, db})
 
 const DiscordClient = require("./d2m/discord-client")
 
-const discord = new DiscordClient(config.discordToken, true)
+const discord = new DiscordClient(config.discordToken, "full")
 passthrough.discord = discord
 
 const as = require("./m2d/appservice")
diff --git a/matrix/mreq.js b/matrix/mreq.js
index df34d91..d5ffeba 100644
--- a/matrix/mreq.js
+++ b/matrix/mreq.js
@@ -43,5 +43,24 @@ async function mreq(method, url, body, extra = {}) {
 	return root
 }
 
+/**
+ * JavaScript doesn't have Racket-like parameters with dynamic scoping, so
+ * do NOT do anything else at the same time as this.
+ * @template T
+ * @param {string} token
+ * @param {(...arg: any[]) => Promise<T>} callback
+ * @returns {Promise<T>}
+ */
+async function withAccessToken(token, callback) {
+	const prevToken = reg.as_token
+	reg.as_token = token
+	try {
+		return await callback()
+	} finally {
+		reg.as_token = prevToken
+	}
+}
+
 module.exports.MatrixServerError = MatrixServerError
 module.exports.mreq = mreq
+module.exports.withAccessToken = withAccessToken
diff --git a/package-lock.json b/package-lock.json
index dfd21ff..6549c67 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
+        "@chriscdn/promise-semaphore": "^2.0.1",
         "better-sqlite3": "^8.3.0",
         "chunk-text": "^2.0.1",
         "cloudstorm": "^0.8.0",
@@ -51,6 +52,11 @@
       "integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==",
       "dev": true
     },
+    "node_modules/@chriscdn/promise-semaphore": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@chriscdn/promise-semaphore/-/promise-semaphore-2.0.1.tgz",
+      "integrity": "sha512-C0Ku5DNZFbafbSRXagidIaRgzhgGmSHk4aAgPpmmHEostazBiSaMryovC/Aix3vRLNuaeGDKN/DHoNECmMD6jg=="
+    },
     "node_modules/@cloudcmd/stub": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/@cloudcmd/stub/-/stub-4.0.1.tgz",
diff --git a/package.json b/package.json
index 238b9ae..5c99b51 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
   "author": "Cadence, PapiOphidian",
   "license": "MIT",
   "dependencies": {
+    "@chriscdn/promise-semaphore": "^2.0.1",
     "better-sqlite3": "^8.3.0",
     "chunk-text": "^2.0.1",
     "cloudstorm": "^0.8.0",
diff --git a/scripts/capture-message-update-events.js b/scripts/capture-message-update-events.js
index 2ff9b49..f345d3f 100644
--- a/scripts/capture-message-update-events.js
+++ b/scripts/capture-message-update-events.js
@@ -23,9 +23,9 @@ const sync = new HeatSync({watchFS: false})
 
 Object.assign(passthrough, {config, sync})
 
-const DiscordClient = require("../d2m/discord-client", false)
+const DiscordClient = require("../d2m/discord-client")
 
-const discord = new DiscordClient(config.discordToken, false)
+const discord = new DiscordClient(config.discordToken, "no")
 passthrough.discord = discord
 
 ;(async () => {
diff --git a/scripts/migrate-from-old-bridge.js b/scripts/migrate-from-old-bridge.js
new file mode 100644
index 0000000..4504aea
--- /dev/null
+++ b/scripts/migrate-from-old-bridge.js
@@ -0,0 +1,124 @@
+// @ts-check
+
+const assert = require("assert").strict
+/** @type {any} */ // @ts-ignore bad types from semaphore
+const Semaphore = require("@chriscdn/promise-semaphore")
+const sqlite = require("better-sqlite3")
+const HeatSync = require("heatsync")
+
+const config = require("../config")
+const passthrough = require("../passthrough")
+
+const sync = new HeatSync({watchFS: false})
+
+/** @type {import("../matrix/read-registration")} */
+const reg = sync.require("../matrix/read-registration")
+assert(reg.old_bridge)
+const oldAT = reg.old_bridge.as_token
+const newAT = reg.as_token
+
+const oldDB = new sqlite(reg.old_bridge.database)
+const db = new sqlite("db/ooye.db")
+
+db.exec(`CREATE TABLE IF NOT EXISTS migration (
+	discord_channel	TEXT NOT NULL,
+	migrated	INTEGER NOT NULL,
+	PRIMARY KEY("discord_channel")
+) WITHOUT ROWID;`)
+
+Object.assign(passthrough, {config, sync, db})
+
+const DiscordClient = require("../d2m/discord-client")
+const discord = new DiscordClient(config.discordToken, "half")
+passthrough.discord = discord
+
+/** @type {import("../d2m/actions/create-space")} */
+const createSpace = sync.require("../d2m/actions/create-space")
+/** @type {import("../d2m/actions/create-room")} */
+const createRoom = sync.require("../d2m/actions/create-room")
+/** @type {import("../matrix/mreq")} */
+const mreq = sync.require("../matrix/mreq")
+/** @type {import("../matrix/api")} */
+const api = sync.require("../matrix/api")
+
+const sema = new Semaphore()
+
+;(async () => {
+	await discord.cloud.connect()
+	console.log("Discord gateway started")
+
+	discord.cloud.on("event", event => onPacket(discord, event))
+})()
+
+/** @param {DiscordClient} discord */
+function onPacket(discord, event) {
+	if (event.t === "GUILD_CREATE") {
+		const guild = event.d
+		if (["1100319549670301727", "112760669178241024", "497159726455455754"].includes(guild.id)) return
+		sema.request(() => migrateGuild(guild))
+	}
+}
+
+const newBridgeMxid = `@${reg.sender_localpart}:${reg.ooye.server_name}`
+
+/** @param {import("discord-api-types/v10").GatewayGuildCreateDispatchData} guild */
+async function migrateGuild(guild) {
+	console.log(`START MIGRATION of ${guild.name} (${guild.id})`)
+
+	// Step 1: Create a new space for the guild (createSpace)
+	const spaceID = await createSpace.syncSpace(guild.id)
+
+	let oldRooms = oldDB.prepare("SELECT matrix_id, discord_guild, discord_channel FROM room_entries INNER JOIN remote_room_data ON remote_id = room_id WHERE discord_guild = ?").all(guild.id)
+	const migrated = db.prepare("SELECT discord_channel FROM migration WHERE migrated = 1").pluck().all()
+	oldRooms = oldRooms.filter(row => discord.channels.has(row.discord_channel) && !migrated.includes(row.discord_channel))
+	console.log("Found these rooms which can be migrated:")
+	console.log(oldRooms)
+
+	for (const row of oldRooms) {
+		const roomID = row.matrix_id
+		const channel = discord.channels.get(row.discord_channel)
+		assert(channel)
+
+		// Step 2: (Using old bridge access token) Join the new bridge to the old rooms and give it PL 100
+		console.log(`-- Joining channel ${channel.name}...`)
+		await mreq.withAccessToken(oldAT, async () => {
+			try {
+				await api.inviteToRoom(roomID, newBridgeMxid)
+			} catch (e) {
+				if (e.message.includes("is already in the room")) {
+					// Great!
+				} else {
+					throw e
+				}
+			}
+			await api.setUserPower(roomID, newBridgeMxid, 100)
+		})
+		await api.joinRoom(roomID)
+
+		// Step 3: Remove the old bridge's aliases
+		console.log(`-- -- Deleting aliases...`)
+		await mreq.withAccessToken(oldAT, async () => { // have to run as old application service since the AS owns its aliases
+			const aliases = (await mreq.mreq("GET", `/client/v3/rooms/${roomID}/aliases`)).aliases
+			for (const alias of aliases) {
+				if (alias.match(/^#?_?discord/)) {
+					await mreq.mreq("DELETE", `/client/v3/directory/room/${alias.replace(/#/g, "%23")}`)
+				}
+			}
+			await api.sendState(roomID, "m.room.canonical_alias", "", {})
+		})
+
+		// Step 4: Add old rooms to new database; they are now also the new rooms
+		db.prepare("REPLACE INTO channel_room (channel_id, room_id, name) VALUES (?, ?, ?)").run(channel.id, row.matrix_id, channel.name)
+		console.log(`-- -- Added to database`)
+
+		// Step 5: Call syncRoom for each room
+		await createRoom.syncRoom(row.discord_channel)
+		console.log(`-- -- Finished syncing`)
+
+		db.prepare("INSERT INTO migration (discord_channel, migrated) VALUES (?, 1)").run(channel.id)
+	}
+
+	// Step 5: Call syncSpace to make sure everything is up to date
+	await createSpace.syncSpace(guild.id)
+	console.log(`Finished migrating ${guild.name} to Out Of Your Element`)
+}
diff --git a/scripts/save-channel-names-to-db.js b/scripts/save-channel-names-to-db.js
index 6f5867a..1e5c541 100644
--- a/scripts/save-channel-names-to-db.js
+++ b/scripts/save-channel-names-to-db.js
@@ -13,7 +13,7 @@ Object.assign(passthrough, {config, sync, db})
 
 const DiscordClient = require("../d2m/discord-client")
 
-const discord = new DiscordClient(config.discordToken, false)
+const discord = new DiscordClient(config.discordToken, "no")
 passthrough.discord = discord
 
 ;(async () => {
diff --git a/test/data.js b/test/data.js
index 98c943a..07415d8 100644
--- a/test/data.js
+++ b/test/data.js
@@ -25,7 +25,7 @@ module.exports = {
 			"m.room.name/": {name: "main"},
 			"m.room.topic/": {topic: "#collective-unconscious | https://docs.google.com/document/d/blah/edit | I spread, pipe, and whip because it is my will. :headstone:\n\nChannel ID: 112760669178241024\nGuild ID: 112760669178241024"},
 			"m.room.guest_access/": {guest_access: "can_join"},
-			"m.room.history_visibility/": {history_visibility: "invited"},
+			"m.room.history_visibility/": {history_visibility: "shared"},
 			"m.space.parent/!jjWAGMeQdNrVZSSfvz:cadence.moe": {
 				via: ["cadence.moe"],
 				canonical: true
@@ -45,7 +45,8 @@ module.exports = {
 				events: {
 					"m.room.avatar": 0
 				}
-			}
+			},
+			"chat.schildi.hide_ui/read_receipts": {hidden: true}
 		}
 	},
 	guild: {
diff --git a/types.d.ts b/types.d.ts
index a8c7e68..6aec80c 100644
--- a/types.d.ts
+++ b/types.d.ts
@@ -21,6 +21,10 @@ export type AppServiceRegistrationConfig = {
 		max_file_size: number
 		server_name: string
 	}
+	old_bridge?: {
+		as_token: string
+		database: string
+	}
 }
 
 export type WebhookCreds = {