m->d: Fix reply previews saying undefined

m2d/converters/event-to-message.js

@@ -522,17 +522,40 @@ async function eventToMessage(event, guild, di) {
 			} else if (repliedToEvent.unsigned?.redacted_because) {
 				contentPreview = " (in reply to a deleted message)"
 			} else {
-				const repliedToContent = repliedToEvent.content.formatted_body || repliedToEvent.content.body
+				// Generate a reply preview for a standard message
-				const contentPreviewChunks = chunk(
+				/** @type {string} */
-					entities.decodeHTML5Strict( // Remove entities like & "
+				let repliedToContent = repliedToEvent.content.formatted_body || repliedToEvent.content.body
-						repliedToContent.replace(/.*<\/mx-reply>/s, "") // Remove everything before replies, so just use the actual message body
+				repliedToContent = repliedToContent.replace(/.*<\/mx-reply>/s, "") // Remove everything before replies, so just use the actual message body
-						.replace(/^\s*<blockquote>.*?<\/blockquote>(.....)/s, "$1") // If the message starts with a blockquote, don't count it and use the message body afterwards
+				repliedToContent = repliedToContent.replace(/^\s*<blockquote>.*?<\/blockquote>(.....)/s, "$1") // If the message starts with a blockquote, don't count it and use the message body afterwards
-						.replace(/(?:\n|<br>)+/g, " ") // Should all be on one line
+				repliedToContent = repliedToContent.replace(/(?:\n|<br>)+/g, " ") // Should all be on one line
-						.replace(/<span [^>]*data-mx-spoiler\b[^>]*>.*?<\/span>/g, "[spoiler]") // Good enough method of removing spoiler content. (I don't want to break out the HTML parser unless I have to.)
+				repliedToContent = repliedToContent.replace(/<span [^>]*data-mx-spoiler\b[^>]*>.*?<\/span>/g, "[spoiler]") // Good enough method of removing spoiler content. (I don't want to break out the HTML parser unless I have to.)
-						.replace(/<[^>]+>/g, "") // Completely strip all HTML tags and formatting.
+				repliedToContent = repliedToContent.replace(/<img([^>]*)>/g, (_, att) => { // Convert Matrix emoji images into Discord emoji markdown
-					), 50)
+					if (!att.includes("data-mx-emoticon")) return ""
+					// Try to get the equivalent Discord emoji, if there is a src and if we know about it
+					const mxcUrlMatch = att.match(/\bsrc="(mxc:\/\/[^"]+)"/)
+					if (mxcUrlMatch) {
+						const row = select("emoji", ["emoji_id", "name", "animated"], {mxc_url: mxcUrlMatch[1]}).get()
+						if (row) {
+							const animatedChar = row.animated ? "a" : ""
+							return `<${animatedChar}:${row.name}:${row.emoji_id}>`
+						}
+					}
+					// Emoji is unknown or inaccessible, try substituting the title text instead
+					const titleTextMatch = att.match(/\btitle=":?([^:"]+)/)
+					if (titleTextMatch) return `:${titleTextMatch[1]}:`
+					// Otherwise we can't use the emoji.
+					return ""
+				})
+				repliedToContent = repliedToContent.replace(/<[^:>][^>]*>/g, "") // Completely strip all HTML tags and formatting.
+				repliedToContent = entities.decodeHTML5Strict(repliedToContent) // Remove entities like &amp; &quot;
+				const contentPreviewChunks = chunk(repliedToContent, 50)
+				if (contentPreviewChunks.length) {
 					contentPreview = ":\n> " + contentPreviewChunks[0]
 					if (contentPreviewChunks.length > 1) contentPreview = contentPreview.replace(/[,.']$/, "") + "..."
+				} else {
+					console.log("Unable to generate reply preview for this replied-to event because we stripped all of it:", repliedToEvent)
+					contentPreview = ""
+				}
 			}
 			replyLine = `> ${replyLine}${contentPreview}\n`
 		})()

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

@@ -1292,6 +1292,100 @@ test("event2message: entities are not escaped in main message or reply preview",
 	)
 })
 
+test("event2message: reply preview converts emoji formatting when replying to a known custom emoji", async t => {
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "> <@cadence:cadence.moe> :hippo:\n\nreply",
+				format: "org.matrix.custom.html",
+				formatted_body: "<mx-reply><blockquote><a href=\"https://matrix.to/#/!TqlyQmifxGUggEmdBN:cadence.moe/$zmO-dtPO6FubBkDxJZ5YmutPIsG1RgV5JJku-9LeGWs?via=cadence.moe&via=matrix.org&via=conduit.rory.gay\">In reply to</a> <a href=\"https://matrix.to/#/@cadence:cadence.moe\">@cadence:cadence.moe</a><br><img data-mx-emoticon height=\"32\" src=\"mxc://cadence.moe/qWmbXeRspZRLPcjseyLmeyXC\" title=\":hippo:\" alt=\":hippo:\" /></blockquote></mx-reply>reply",
+				"m.relates_to": {
+					"m.in_reply_to": {
+						event_id: "$zmO-dtPO6FubBkDxJZ5YmutPIsG1RgV5JJku-9LeGWs"
+					}
+				}
+			},
+			event_id: "$bCMLaLiMfoRajaGTgzaxAci-g8hJfkspVJIKwYktnvc",
+			room_id: "!TqlyQmifxGUggEmdBN:cadence.moe"
+		}, data.guild.general, {
+			api: {
+				getEvent: mockGetEvent(t, "!TqlyQmifxGUggEmdBN:cadence.moe", "$zmO-dtPO6FubBkDxJZ5YmutPIsG1RgV5JJku-9LeGWs", {
+					type: "m.room.message",
+					sender: "@cadence:cadence.moe",
+					content: {
+						msgtype: "m.text",
+						body: ":hippo:",
+						format: "org.matrix.custom.html",
+						formatted_body: "<img data-mx-emoticon height=\"32\" src=\"mxc://cadence.moe/qWmbXeRspZRLPcjseyLmeyXC\" title=\":hippo:\" alt=\":hippo:\">"
+					}
+				})
+			}
+		}),
+		{
+			ensureJoined: [],
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "> <:L1:1144820033948762203><:L2:1144820084079087647>Ⓜ️**cadence [they]**:"
+					+ "\n> <:hippo:230201364309868544>"
+					+ "\nreply",
+				avatar_url: undefined
+			}]
+		}
+	)
+})
+
+test("event2message: reply preview uses emoji title text when replying to an unknown custom emoji", async t => {
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: "> <@cadence:cadence.moe> :hippo:\n\nreply",
+				format: "org.matrix.custom.html",
+				formatted_body: "<mx-reply><blockquote><a href=\"https://matrix.to/#/!TqlyQmifxGUggEmdBN:cadence.moe/$zmO-dtPO6FubBkDxJZ5YmutPIsG1RgV5JJku-9LeGWs?via=cadence.moe&via=matrix.org&via=conduit.rory.gay\">In reply to</a> <a href=\"https://matrix.to/#/@cadence:cadence.moe\">@cadence:cadence.moe</a><br><img data-mx-emoticon height=\"32\" src=\"mxc://cadence.moe/AHKNeXoRlprdULRMalhqfCdj\" title=\":hippo:\" alt=\":hippo:\" /></blockquote></mx-reply>reply",
+				"m.relates_to": {
+					"m.in_reply_to": {
+						event_id: "$zmO-dtPO6FubBkDxJZ5YmutPIsG1RgV5JJku-9LeGWs"
+					}
+				}
+			},
+			event_id: "$bCMLaLiMfoRajaGTgzaxAci-g8hJfkspVJIKwYktnvc",
+			room_id: "!TqlyQmifxGUggEmdBN:cadence.moe"
+		}, data.guild.general, {
+			api: {
+				getEvent: mockGetEvent(t, "!TqlyQmifxGUggEmdBN:cadence.moe", "$zmO-dtPO6FubBkDxJZ5YmutPIsG1RgV5JJku-9LeGWs", {
+					type: "m.room.message",
+					sender: "@cadence:cadence.moe",
+					content: {
+						msgtype: "m.text",
+						body: ":hippo:",
+						format: "org.matrix.custom.html",
+						formatted_body: "<img data-mx-emoticon height=\"32\" src=\"mxc://cadence.moe/AHKNeXoRlprdULRMalhqfCdj\" title=\":hippo:\" alt=\":hippo:\">"
+					}
+				})
+			}
+		}),
+		{
+			ensureJoined: [],
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "> <:L1:1144820033948762203><:L2:1144820084079087647>Ⓜ️**cadence [they]**:"
+					+ "\n> :hippo:"
+					+ "\nreply",
+				avatar_url: undefined
+			}]
+		}
+	)
+})
+
 test("event2message: editing a rich reply to a sim user", async t => {
 	const eventsFetched = []
 	t.deepEqual(

test/ooye-test-data.sql

@@ -117,7 +117,8 @@ INSERT INTO member_cache (room_id, mxid, displayname, avatar_url) VALUES
 ('!CzvdIdUQXgUjDVKxeU:cadence.moe', '@cadence:cadence.moe', 'cadence [they]', 'mxc://cadence.moe/azCAhThKTojXSZJRoWwZmhvU'),
 ('!cBxtVRxDlZvSVhJXVK:cadence.moe', '@Milan:tchncs.de', 'Milan', NULL),
 ('!TqlyQmifxGUggEmdBN:cadence.moe', '@ampflower:matrix.org', 'Ampflower 🌺', 'mxc://cadence.moe/PRfhXYBTOalvgQYtmCLeUXko'),
-('!TqlyQmifxGUggEmdBN:cadence.moe', '@aflower:syndicated.gay', 'Rose', 'mxc://syndicated.gay/ZkBUPXCiXTjdJvONpLJmcbKP');
+('!TqlyQmifxGUggEmdBN:cadence.moe', '@aflower:syndicated.gay', 'Rose', 'mxc://syndicated.gay/ZkBUPXCiXTjdJvONpLJmcbKP'),
+('!TqlyQmifxGUggEmdBN:cadence.moe', '@cadence:cadence.moe', 'cadence [they]', NULL);
 
 INSERT INTO lottie (sticker_id, mxc_url) VALUES
 ('860171525772279849', 'mxc://cadence.moe/ZtvvVbwMIdUZeovWVyGVFCeR');