out-of-your-element/d2m/converters/message-to-event.js

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// @ts-check
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const assert = require("assert").strict
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const markdown = require("discord-markdown")
const pb = require("prettier-bytes")
const DiscordTypes = require("discord-api-types/v10")
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const passthrough = require("../../passthrough")
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const {sync, db, discord, select, from} = passthrough
/** @type {import("../../matrix/file")} */
const file = sync.require("../../matrix/file")
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/** @type {import("./lottie")} */
const lottie = sync.require("./lottie")
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const reg = require("../../matrix/read-registration")
const userRegex = reg.namespaces.users.map(u => new RegExp(u.regex))
function getDiscordParseCallbacks(message, useHTML) {
return {
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/** @param {{id: string, type: "discordUser"}} node */
user: node => {
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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 `<a href="https://matrix.to/#/${mxid}">@${username}</a>`
} else {
return `@${username}:`
}
},
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/** @param {{id: string, type: "discordChannel"}} node */
channel: node => {
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const row = select("channel_room", ["room_id", "name", "nick"], {channel_id: node.id}).get()
if (!row) {
return `<#${node.id}>` // fallback for when this channel is not bridged
} else if (useHTML) {
return `<a href="https://matrix.to/#/${row.room_id}">#${row.nick || row.name}</a>`
} else {
return `#${row.nick || row.name}`
}
},
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/** @param {{animated: boolean, name: string, id: string, type: "discordEmoji"}} node */
emoji: node => {
if (useHTML) {
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const mxc = select("emoji", "mxc_url", {emoji_id: node.id}).pluck().get()
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if (mxc) {
return `<img data-mx-emoticon height="32" src="${mxc}" title=":${node.name}:" alt=":${node.name}:">`
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} else { // We shouldn't get here since all emojis should have been added ahead of time in the messageToEvent function.
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return `<img src="mxc://cadence.moe/${node.id}" data-mx-emoticon alt=":${node.name}:" title=":${node.name}:" height="24">`
}
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} else {
return `:${node.name}:`
}
},
role: node =>
"@&" + node.id,
everyone: node =>
"@room",
here: node =>
"@here"
}
}
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/**
* @param {import("discord-api-types/v10").APIMessage} message
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* @param {import("discord-api-types/v10").APIGuild} guild
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* @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
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*/
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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)
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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 = {}
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let repliedToEventRow = null
let repliedToEventSenderMxid = null
function addMention(mxid) {
if (!mentions.user_ids) mentions.user_ids = []
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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) {
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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) {
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repliedToEventRow = row
}
}
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if (repliedToEventRow && repliedToEventRow.source === 0) { // reply was originally from Matrix
// Need to figure out who sent that event...
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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)
}
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async function addTextEvent(content, msgtype, {scanMentions}) {
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content = content.replace(/https:\/\/(?:ptb\.|canary\.|www\.)?discord(?:app)?\.com\/channels\/([0-9]+)\/([0-9]+)\/([0-9]+)/, (whole, guildID, channelID, messageID) => {
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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}/${eventID}`
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} else {
return `${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.
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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]
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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, {
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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.
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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())
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const roomID = select("channel_room", "room_id", {channel_id: message.channel_id}).pluck().get()
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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]
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if (writtenMentionsText.includes(localpart[1].toLowerCase()) || writtenMentionsText.includes(displayName.toLowerCase())) addMention(mxid)
}
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}
}
}
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// Star * prefix for fallback edits
if (options.includeEditFallbackStar) {
body = "* " + body
html = "* " + html
}
// Fallback body/formatted_body for replies
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// This branch is optional - do NOT change anything apart from the reply fallback, since it may not be run
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if (repliedToEventRow && options.includeReplyFallback !== false) {
let repliedToDisplayName
let repliedToUserHtml
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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 = `<a href="https://matrix.to/#/${repliedToEventSenderMxid}">${repliedToDisplayName}</a>`
} 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)
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html = `<mx-reply><blockquote><a href="https://matrix.to/#/${repliedToEventRow.room_id}/${repliedToEventRow.event_id}">In reply to</a> ${repliedToUserHtml}`
+ `<br>${repliedToHtml}</blockquote></mx-reply>`
+ 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)
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}
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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") ? "📸"
: attachment.content_type?.startsWith("image/") ? "🖼️"
: attachment.content_type?.startsWith("video/") ? "🎞️"
: attachment.content_type?.startsWith("text/") ? "📝"
: attachment.content_type?.startsWith("audio/") ? "🎶"
: "📄"
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// 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: `<blockquote>${emoji} Uploaded SPOILER file: <span data-mx-spoiler><a href="${attachment.url}">View</a></span> (${pb(attachment.size)})</blockquote>`
}
}
// for large files, always link them instead of uploading so I don't use up all the space in the content repo
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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: `${emoji} Uploaded file: <a href="${attachment.url}">${attachment.filename}</a> (${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,
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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 {
$type: "m.room.message",
"m.mentions": mentions,
msgtype: "m.file",
url: await file.uploadDiscordFileToMxc(attachment.url),
external_url: attachment.url,
body: attachment.filename,
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filename: attachment.filename,
info: {
mimetype: attachment.content_type,
size: attachment.size
}
}
}
}))
events.push(...attachmentEvents)
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// Then embeds
for (const embed of message.embeds || []) {
if (embed.type === "image") {
continue // Matrix already does a fine enough job of providing image embeds.
}
// Start building up a replica ("rep") of the embed in Discord-markdown format, which we will convert into both plaintext and formatted body at once
let repParagraphs = []
const makeUrlTitle = (text, url) =>
( text && url ? `[**${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)
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if (embed.image?.url) repParagraphs.push(`📸 ${embed.image.url}`)
if (embed.video?.url) repParagraphs.push(`🎞️ ${embed.video.url}`)
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if (embed.description) repParagraphs.push(embed.description)
for (const field of embed.fields || []) {
repParagraphs.push(`**${field.name}**\n${field.value}`)
}
if (embed.footer?.text) repParagraphs.push(`${embed.footer.text}`)
const repContent = repParagraphs.join("\n\n")
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const repContentQuoted = repContent.split("\n").map(l => "> " + l).join("\n")
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// Send as m.notice to apply the usual automated/subtle appearance, showing this wasn't actually typed by the person
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await addTextEvent(repContentQuoted, "m.notice", {scanMentions: false})
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}
// Then stickers
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if (message.sticker_items) {
const stickerEvents = await Promise.all(message.sticker_items.map(async stickerItem => {
const format = file.stickerFormat.get(stickerItem.format_type)
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if (format?.mime === "lottie") {
try {
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const {mxc_url, info} = await lottie.convert(stickerItem)
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return {
$type: "m.sticker",
"m.mentions": mentions,
body: stickerItem.name,
info,
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url: mxc_url
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}
} 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) {
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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,
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body,
info: {
mimetype: format.mime
},
url: await file.uploadDiscordFileToMxc(file.sticker(stickerItem))
}
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}
return {
$type: "m.room.message",
"m.mentions": mentions,
msgtype: "m.notice",
body: `Unsupported sticker format ${format?.mime}. Name: ${stickerItem.name}`
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}
}))
events.push(...stickerEvents)
}
// Rich replies
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if (repliedToEventRow) {
Object.assign(events[0], {
"m.relates_to": {
"m.in_reply_to": {
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event_id: repliedToEventRow.event_id
}
}
})
}
return events
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}
module.exports.messageToEvent = messageToEvent