// @ts-check const assert = require("assert").strict const markdown = require("discord-markdown") const pb = require("prettier-bytes") const DiscordTypes = require("discord-api-types/v10") const passthrough = require("../../passthrough") const {sync, db, discord, select, from} = passthrough /** @type {import("../../matrix/file")} */ const file = sync.require("../../matrix/file") /** @type {import("./lottie")} */ const lottie = sync.require("./lottie") const reg = require("../../matrix/read-registration") const userRegex = reg.namespaces.users.map(u => new RegExp(u.regex)) function getDiscordParseCallbacks(message, useHTML) { return { /** @param {{id: string, type: "discordUser"}} node */ user: node => { const mxid = select("sim", "mxid", {user_id: node.id}).pluck().get() const username = message.mentions.find(ment => ment.id === node.id)?.username || node.id if (mxid && useHTML) { return `@${username}` } else { return `@${username}:` } }, /** @param {{id: string, type: "discordChannel"}} node */ channel: node => { const row = select("channel_room", ["room_id", "name", "nick"], {channel_id: node.id}).get() if (!row) { return `<#${node.id}>` // fallback for when this channel is not bridged } else if (useHTML) { return `#${row.nick || row.name}` } else { return `#${row.nick || row.name}` } }, /** @param {{animated: boolean, name: string, id: string, type: "discordEmoji"}} node */ emoji: node => { if (useHTML) { const mxc = select("emoji", "mxc_url", {emoji_id: node.id}).pluck().get() if (mxc) { return `:${node.name}:` } else { // We shouldn't get here since all emojis should have been added ahead of time in the messageToEvent function. return `:${node.name}:` } } else { return `:${node.name}:` } }, role: node => "@&" + node.id, everyone: node => "@room", here: node => "@here" } } /** * @param {import("discord-api-types/v10").APIMessage} message * @param {import("discord-api-types/v10").APIGuild} guild * @param {{includeReplyFallback?: boolean, includeEditFallbackStar?: boolean}} options default values: * - includeReplyFallback: true * - includeEditFallbackStar: false * @param {{api: import("../../matrix/api")}} di simple-as-nails dependency injection for the matrix API */ async function messageToEvent(message, guild, options = {}, di) { const events = [] if (message.type === DiscordTypes.MessageType.ThreadCreated) { // This is the kind of message that appears when somebody makes a thread which isn't close enough to the message it's based off. // It lacks the lines and the pill, so it looks kind of like a member join message, and it says: // [#] NICKNAME started a thread: __THREAD NAME__. __See all threads__ // We're already bridging the THREAD_CREATED gateway event to make a comparable message, so drop this one. return [] } if (message.type === DiscordTypes.MessageType.ThreadStarterMessage) { // This is the message that appears at the top of a thread when the thread was based off an existing message. // It's just a message reference, no content. const ref = message.message_reference assert(ref) assert(ref.message_id) const eventID = select("event_message", "event_id", {message_id: ref.message_id}).pluck().get() const roomID = select("channel_room", "room_id", {channel_id: ref.channel_id}).pluck().get() if (!eventID || !roomID) return [] const event = await di.api.getEvent(roomID, eventID) return [{ ...event.content, $type: event.type }] } /** @type {{room?: boolean, user_ids?: string[]}} We should consider the following scenarios for mentions: 1. A discord user rich-replies to a matrix user with a text post + The matrix user needs to be m.mentioned in the text event + The matrix user needs to have their name/mxid/link in the text event (notification fallback) - So prepend their `@name:` to the start of the plaintext body 2. A discord user rich-replies to a matrix user with an image event only + The matrix user needs to be m.mentioned in the image event + TODO The matrix user needs to have their name/mxid in the image event's body field, alongside the filename (notification fallback) - So append their name to the filename body, I guess!!! 3. A discord user `@`s a matrix user in the text body of their text box + The matrix user needs to be m.mentioned in the text event + No change needed to the text event content: it already has their name - So make sure we don't do anything in this case. */ const mentions = {} let repliedToEventRow = null let repliedToEventSenderMxid = null function addMention(mxid) { if (!mentions.user_ids) mentions.user_ids = [] if (!mentions.user_ids.includes(mxid)) mentions.user_ids.push(mxid) } // Mentions scenarios 1 and 2, part A. i.e. translate relevant message.mentions to m.mentions // (Still need to do scenarios 1 and 2 part B, and scenario 3.) if (message.type === DiscordTypes.MessageType.Reply && message.message_reference?.message_id) { const row = from("event_message").join("message_channel", "message_id").join("channel_room", "channel_id").select("event_id", "room_id", "source").and("WHERE message_id = ? AND part = 0").get(message.message_reference.message_id) if (row) { repliedToEventRow = row } } if (repliedToEventRow && repliedToEventRow.source === 0) { // reply was originally from Matrix // Need to figure out who sent that event... const event = await di.api.getEvent(repliedToEventRow.room_id, repliedToEventRow.event_id) repliedToEventSenderMxid = event.sender // Need to add the sender to m.mentions addMention(repliedToEventSenderMxid) } async function addTextEvent(content, msgtype, {scanMentions}) { content = content.replace(/https:\/\/(?:ptb\.|canary\.|www\.)?discord(?:app)?\.com\/channels\/([0-9]+)\/([0-9]+)\/([0-9]+)/, (whole, guildID, channelID, messageID) => { const eventID = select("event_message", "event_id", {message_id: messageID}).pluck().get() const roomID = select("channel_room", "room_id", {channel_id: channelID}).pluck().get() if (eventID && roomID) { return `https://matrix.to/#/${roomID}/${eventID}` } else { return `${whole} [event not found]` } }) // Handling emojis that we don't know about. The emoji has to be present in the DB for it to be picked up in the emoji markdown converter. // So we scan the message ahead of time for all its emojis and ensure they are in the DB. const emojiMatches = [...content.matchAll(/<(a?):([^:>]{2,64}):([0-9]+)>/g)] const emojiDownloads = [] for (const match of emojiMatches) { const id = match[3] const name = match[2] const animated = +!!match[1] const exists = select("emoji", "emoji_id", {emoji_id: id}).pluck().get() if (!exists) { // The custom emoji is not registered. We will register it and then add it. emojiDownloads.push( file.uploadDiscordFileToMxc(file.emoji(id, animated)).then(mxc => { db.prepare("INSERT OR IGNORE INTO emoji (id, name, animated, mxc_url) VALUES (?, ?, ?, ?)").run(id, name, animated, mxc) }) ) } } await Promise.all(emojiDownloads) let html = markdown.toHTML(content, { discordCallback: getDiscordParseCallbacks(message, true) }, null, null) let body = markdown.toHTML(content, { discordCallback: getDiscordParseCallbacks(message, false), discordOnly: true, escapeHTML: false, }, null, null) // Mentions scenario 3: scan the message content for written @mentions of matrix users. Allows for up to one space between @ and mention. if (scanMentions) { const matches = [...content.matchAll(/@ ?([a-z0-9._]+)\b/gi)] if (matches.length && matches.some(m => m[1].match(/[a-z]/i))) { const writtenMentionsText = matches.map(m => m[1].toLowerCase()) const roomID = select("channel_room", "room_id", {channel_id: message.channel_id}).pluck().get() assert(roomID) const {joined} = await di.api.getJoinedMembers(roomID) for (const [mxid, member] of Object.entries(joined)) { if (!userRegex.some(rx => mxid.match(rx))) { const localpart = mxid.match(/@([^:]*)/) assert(localpart) const displayName = member.display_name || localpart[1] if (writtenMentionsText.includes(localpart[1].toLowerCase()) || writtenMentionsText.includes(displayName.toLowerCase())) addMention(mxid) } } } } // Star * prefix for fallback edits if (options.includeEditFallbackStar) { body = "* " + body html = "* " + html } // Fallback body/formatted_body for replies // This branch is optional - do NOT change anything apart from the reply fallback, since it may not be run if (repliedToEventRow && options.includeReplyFallback !== false) { let repliedToDisplayName let repliedToUserHtml if (repliedToEventRow?.source === 0 && repliedToEventSenderMxid) { const match = repliedToEventSenderMxid.match(/^@([^:]*)/) assert(match) repliedToDisplayName = match[1] || "a Matrix user" // grab the localpart as the display name, whatever repliedToUserHtml = `${repliedToDisplayName}` } else { repliedToDisplayName = message.referenced_message?.author.global_name || message.referenced_message?.author.username || "a Discord user" repliedToUserHtml = repliedToDisplayName } let repliedToContent = message.referenced_message?.content if (repliedToContent == "") repliedToContent = "[Media]" else if (!repliedToContent) repliedToContent = "[Replied-to message content wasn't provided by Discord]" const repliedToHtml = markdown.toHTML(repliedToContent, { discordCallback: getDiscordParseCallbacks(message, true) }, null, null) const repliedToBody = markdown.toHTML(repliedToContent, { discordCallback: getDiscordParseCallbacks(message, false), discordOnly: true, escapeHTML: false, }, null, null) html = `
In reply to ${repliedToUserHtml}` + `
${repliedToHtml}
` + html body = (`${repliedToDisplayName}: ` // scenario 1 part B for mentions + repliedToBody).split("\n").map(line => "> " + line).join("\n") + "\n\n" + body } const newTextMessageEvent = { $type: "m.room.message", "m.mentions": mentions, msgtype, body: body } const isPlaintext = body === html if (!isPlaintext) { Object.assign(newTextMessageEvent, { format: "org.matrix.custom.html", formatted_body: html }) } events.push(newTextMessageEvent) } let msgtype = "m.text" // Handle message type 4, channel name changed if (message.type === DiscordTypes.MessageType.ChannelNameChange) { msgtype = "m.emote" message.content = "changed the channel name to **" + message.content + "**" } // Text content appears first if (message.content) { await addTextEvent(message.content, msgtype, {scanMentions: true}) } // Then attachments const attachmentEvents = await Promise.all(message.attachments.map(async attachment => { const emoji = attachment.content_type?.startsWith("image/jp") ? "πŸ“Έ" : attachment.content_type?.startsWith("image/") ? "πŸ–ΌοΈ" : attachment.content_type?.startsWith("video/") ? "🎞️" : attachment.content_type?.startsWith("text/") ? "πŸ“" : attachment.content_type?.startsWith("audio/") ? "🎢" : "πŸ“„" // no native media spoilers in Element, so we'll post a link instead, forcing it to not preview using a blockquote if (attachment.filename.startsWith("SPOILER_")) { return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.text", body: `${emoji} Uploaded SPOILER file: ${attachment.url} (${pb(attachment.size)})`, format: "org.matrix.custom.html", formatted_body: `
${emoji} Uploaded SPOILER file: View (${pb(attachment.size)})
` } } // for large files, always link them instead of uploading so I don't use up all the space in the content repo else if (attachment.size > reg.ooye.max_file_size) { return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.text", body: `${emoji} Uploaded file: ${attachment.url} (${pb(attachment.size)})`, format: "org.matrix.custom.html", formatted_body: `${emoji} Uploaded file: ${attachment.filename} (${pb(attachment.size)})` } } else if (attachment.content_type?.startsWith("image/") && attachment.width && attachment.height) { return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.image", url: await file.uploadDiscordFileToMxc(attachment.url), external_url: attachment.url, body: attachment.filename, filename: attachment.filename, info: { mimetype: attachment.content_type, w: attachment.width, h: attachment.height, size: attachment.size } } } else if (attachment.content_type?.startsWith("video/") && attachment.width && attachment.height) { return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.video", url: await file.uploadDiscordFileToMxc(attachment.url), external_url: attachment.url, body: attachment.description || attachment.filename, filename: attachment.filename, info: { mimetype: attachment.content_type, w: attachment.width, h: attachment.height, size: attachment.size } } } else if (attachment.content_type?.startsWith("audio/")) { return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.audio", url: await file.uploadDiscordFileToMxc(attachment.url), external_url: attachment.url, body: attachment.description || attachment.filename, filename: attachment.filename, info: { mimetype: attachment.content_type, size: attachment.size, duration: attachment.duration_secs ? attachment.duration_secs * 1000 : undefined } } } else { return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.file", url: await file.uploadDiscordFileToMxc(attachment.url), external_url: attachment.url, body: attachment.filename, filename: attachment.filename, info: { mimetype: attachment.content_type, size: attachment.size } } } })) events.push(...attachmentEvents) // Then embeds for (const embed of message.embeds || []) { if (embed.type === "image") { continue // Matrix already does a fine enough job of providing image embeds. } // Start building up a replica ("rep") of the embed in Discord-markdown format, which we will convert into both plaintext and formatted body at once let repParagraphs = [] const makeUrlTitle = (text, url) => ( text && url ? `[**${text}**](${url})` : text ? `**${text}**` : url ? `**${url}**` : "") let authorNameText = embed.author?.name || "" if (authorNameText && embed.author?.icon_url) authorNameText = `⏺️ ${authorNameText}` // not using the real image let authorTitle = makeUrlTitle(authorNameText, embed.author?.url) if (authorTitle) repParagraphs.push(authorTitle) let title = makeUrlTitle(embed.title, embed.url) if (title) repParagraphs.push(title) if (embed.image?.url) repParagraphs.push(`πŸ“Έ ${embed.image.url}`) if (embed.video?.url) repParagraphs.push(`🎞️ ${embed.video.url}`) if (embed.description) repParagraphs.push(embed.description) for (const field of embed.fields || []) { repParagraphs.push(`**${field.name}**\n${field.value}`) } if (embed.footer?.text) repParagraphs.push(`β€” ${embed.footer.text}`) const repContent = repParagraphs.join("\n\n") const repContentQuoted = repContent.split("\n").map(l => "> " + l).join("\n") // Send as m.notice to apply the usual automated/subtle appearance, showing this wasn't actually typed by the person await addTextEvent(repContentQuoted, "m.notice", {scanMentions: false}) } // Then stickers if (message.sticker_items) { const stickerEvents = await Promise.all(message.sticker_items.map(async stickerItem => { const format = file.stickerFormat.get(stickerItem.format_type) if (format?.mime === "lottie") { try { const {mxc_url, info} = await lottie.convert(stickerItem) return { $type: "m.sticker", "m.mentions": mentions, body: stickerItem.name, info, url: mxc_url } } catch (e) { return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.notice", body: `Failed to convert Lottie sticker:\n${e.toString()}\n${e.stack}` } } } else if (format?.mime) { let body = stickerItem.name const sticker = guild.stickers.find(sticker => sticker.id === stickerItem.id) if (sticker && sticker.description) body += ` - ${sticker.description}` return { $type: "m.sticker", "m.mentions": mentions, body, info: { mimetype: format.mime }, url: await file.uploadDiscordFileToMxc(file.sticker(stickerItem)) } } return { $type: "m.room.message", "m.mentions": mentions, msgtype: "m.notice", body: `Unsupported sticker format ${format?.mime}. Name: ${stickerItem.name}` } })) events.push(...stickerEvents) } // Rich replies if (repliedToEventRow) { Object.assign(events[0], { "m.relates_to": { "m.in_reply_to": { event_id: repliedToEventRow.event_id } } }) } return events } module.exports.messageToEvent = messageToEvent