344 lines
13 KiB
JavaScript
344 lines
13 KiB
JavaScript
// @ts-check
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const assert = require("assert").strict
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const markdown = require("discord-markdown")
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const pb = require("prettier-bytes")
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const DiscordTypes = require("discord-api-types/v10")
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const passthrough = require("../../passthrough")
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const { sync, db, discord } = passthrough
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/** @type {import("../../matrix/file")} */
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const file = sync.require("../../matrix/file")
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const reg = require("../../matrix/read-registration")
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const userRegex = reg.namespaces.users.map(u => new RegExp(u.regex))
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function getDiscordParseCallbacks(message, useHTML) {
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return {
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/** @param {{id: string, type: "discordUser"}} node */
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user: node => {
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const mxid = db.prepare("SELECT mxid FROM sim WHERE discord_id = ?").pluck().get(node.id)
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const username = message.mentions.find(ment => ment.id === node.id)?.username || node.id
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if (mxid && useHTML) {
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return `<a href="https://matrix.to/#/${mxid}">@${username}</a>`
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} else {
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return `@${username}:`
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}
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},
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/** @param {{id: string, type: "discordChannel"}} node */
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channel: node => {
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const row = db.prepare("SELECT room_id, name, nick FROM channel_room WHERE channel_id = ?").get(node.id)
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if (!row) {
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return `<#${node.id}>` // fallback for when this channel is not bridged
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} else if (useHTML) {
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return `<a href="https://matrix.to/#/${row.room_id}">#${row.nick || row.name}</a>`
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} else {
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return `#${row.nick || row.name}`
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}
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},
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/** @param {{animated: boolean, name: string, id: string, type: "discordEmoji"}} node */
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emoji: node => {
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if (useHTML) {
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// TODO: upload the emoji and actually use the right mxc!!
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return `<img src="mxc://cadence.moe/${node.id}" data-mx-emoticon alt=":${node.name}:" title=":${node.name}:" height="24">`
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} else {
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return `:${node.name}:`
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}
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},
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role: node =>
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"@&" + node.id,
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everyone: node =>
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"@room",
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here: node =>
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"@here"
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}
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}
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/**
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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:
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* - includeReplyFallback: true
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* - includeEditFallbackStar: false
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* @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) {
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const events = []
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if (message.type === DiscordTypes.MessageType.ThreadCreated) {
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// 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.
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// It lacks the lines and the pill, so it looks kind of like a member join message, and it says:
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// [#] NICKNAME started a thread: __THREAD NAME__. __See all threads__
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// We're already bridging the THREAD_CREATED gateway event to make a comparable message, so drop this one.
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return []
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}
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if (message.type === DiscordTypes.MessageType.ThreadStarterMessage) {
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// This is the message that appears at the top of a thread when the thread was based off an existing message.
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// It's just a message reference, no content.
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const ref = message.message_reference
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assert(ref)
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assert(ref.message_id)
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const row = db.prepare("SELECT room_id, event_id FROM event_message INNER JOIN channel_room USING (channel_id) WHERE channel_id = ? AND message_id = ?").get(ref.channel_id, ref.message_id)
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if (!row) return []
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const event = await di.api.getEvent(row.room_id, row.event_id)
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return [{
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...event.content,
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$type: event.type
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}]
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}
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/**
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@type {{room?: boolean, user_ids?: string[]}}
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We should consider the following scenarios for mentions:
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1. A discord user rich-replies to a matrix user with a text post
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+ The matrix user needs to be m.mentioned in the text event
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+ The matrix user needs to have their name/mxid/link in the text event (notification fallback)
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- So prepend their `@name:` to the start of the plaintext body
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2. A discord user rich-replies to a matrix user with an image event only
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+ The matrix user needs to be m.mentioned in the image event
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+ TODO The matrix user needs to have their name/mxid in the image event's body field, alongside the filename (notification fallback)
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- So append their name to the filename body, I guess!!!
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3. A discord user `@`s a matrix user in the text body of their text box
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+ The matrix user needs to be m.mentioned in the text event
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+ No change needed to the text event content: it already has their name
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- So make sure we don't do anything in this case.
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*/
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const mentions = {}
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let repliedToEventId = null
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let repliedToEventRoomId = null
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let repliedToEventSenderMxid = null
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let repliedToEventOriginallyFromMatrix = false
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function addMention(mxid) {
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if (!mentions.user_ids) mentions.user_ids = []
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if (!mentions.user_ids.includes(mxid)) mentions.user_ids.push(mxid)
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}
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// Mentions scenarios 1 and 2, part A. i.e. translate relevant message.mentions to m.mentions
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// (Still need to do scenarios 1 and 2 part B, and scenario 3.)
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if (message.type === DiscordTypes.MessageType.Reply && message.message_reference?.message_id) {
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const row = db.prepare("SELECT event_id, room_id, source FROM event_message INNER JOIN channel_room USING (channel_id) WHERE message_id = ? AND part = 0").get(message.message_reference.message_id)
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if (row) {
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repliedToEventId = row.event_id
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repliedToEventRoomId = row.room_id
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repliedToEventOriginallyFromMatrix = row.source === 0 // source 0 = matrix
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}
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}
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if (repliedToEventOriginallyFromMatrix) {
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// Need to figure out who sent that event...
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const event = await di.api.getEvent(repliedToEventRoomId, repliedToEventId)
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repliedToEventSenderMxid = event.sender
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// Need to add the sender to m.mentions
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addMention(repliedToEventSenderMxid)
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}
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let msgtype = "m.text"
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// Handle message type 4, channel name changed
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if (message.type === DiscordTypes.MessageType.ChannelNameChange) {
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msgtype = "m.emote"
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message.content = "changed the channel name to **" + message.content + "**"
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}
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// Text content appears first
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if (message.content) {
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let content = message.content
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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 row = db.prepare("SELECT room_id, event_id FROM event_message INNER JOIN channel_room USING (channel_id) WHERE channel_id = ? AND message_id = ? AND part = 0").get(channelID, messageID)
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if (row) {
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return `https://matrix.to/#/${row.room_id}/${row.event_id}`
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} else {
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return `${whole} [event not found]`
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}
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})
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let html = markdown.toHTML(content, {
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discordCallback: getDiscordParseCallbacks(message, true)
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}, null, null)
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// TODO: add a string return type to my discord-markdown library
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let body = markdown.toHTML(content, {
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discordCallback: getDiscordParseCallbacks(message, false),
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discordOnly: true,
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escapeHTML: false,
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}, null, null)
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// 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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const matches = [...content.matchAll(/@ ?([a-z0-9._]+)\b/gi)]
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if (matches.length && matches.some(m => m[1].match(/[a-z]/i))) {
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const writtenMentionsText = matches.map(m => m[1].toLowerCase())
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const roomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").pluck().get(message.channel_id)
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const {joined} = await di.api.getJoinedMembers(roomID)
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for (const [mxid, member] of Object.entries(joined)) {
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if (!userRegex.some(rx => mxid.match(rx))) {
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const localpart = mxid.match(/@([^:]*)/)
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assert(localpart)
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if (writtenMentionsText.includes(localpart[1].toLowerCase()) || writtenMentionsText.includes(member.display_name.toLowerCase())) addMention(mxid)
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}
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}
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}
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// Star * prefix for fallback edits
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if (options.includeEditFallbackStar) {
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body = "* " + body
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html = "* " + html
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}
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// 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 (repliedToEventId && options.includeReplyFallback !== false) {
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let repliedToDisplayName
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let repliedToUserHtml
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if (repliedToEventOriginallyFromMatrix && repliedToEventSenderMxid) {
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const match = repliedToEventSenderMxid.match(/^@([^:]*)/)
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assert(match)
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repliedToDisplayName = match[1] || "a Matrix user" // grab the localpart as the display name, whatever
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repliedToUserHtml = `<a href="https://matrix.to/#/${repliedToEventSenderMxid}">${repliedToDisplayName}</a>`
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} else {
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repliedToDisplayName = message.referenced_message?.author.global_name || message.referenced_message?.author.username || "a Discord user"
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repliedToUserHtml = repliedToDisplayName
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}
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let repliedToContent = message.referenced_message?.content
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if (repliedToContent == "") repliedToContent = "[Media]"
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else if (!repliedToContent) repliedToContent = "[Replied-to message content wasn't provided by Discord]"
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const repliedToHtml = markdown.toHTML(repliedToContent, {
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discordCallback: getDiscordParseCallbacks(message, true)
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}, null, null)
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const repliedToBody = markdown.toHTML(repliedToContent, {
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discordCallback: getDiscordParseCallbacks(message, false),
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discordOnly: true,
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escapeHTML: false,
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}, null, null)
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html = `<mx-reply><blockquote><a href="https://matrix.to/#/${repliedToEventRoomId}/${repliedToEventId}">In reply to</a> ${repliedToUserHtml}`
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+ `<br>${repliedToHtml}</blockquote></mx-reply>`
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+ html
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body = (`${repliedToDisplayName}: ` // scenario 1 part B for mentions
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+ repliedToBody).split("\n").map(line => "> " + line).join("\n")
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+ "\n\n" + body
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}
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const newTextMessageEvent = {
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$type: "m.room.message",
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"m.mentions": mentions,
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msgtype,
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body: body
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}
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const isPlaintext = body === html
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if (!isPlaintext) {
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Object.assign(newTextMessageEvent, {
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format: "org.matrix.custom.html",
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formatted_body: html
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})
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}
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events.push(newTextMessageEvent)
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}
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// Then attachments
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const attachmentEvents = await Promise.all(message.attachments.map(async attachment => {
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const emoji =
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attachment.content_type?.startsWith("image/jp") ? "📸"
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: attachment.content_type?.startsWith("image/") ? "🖼️"
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: attachment.content_type?.startsWith("video/") ? "🎞️"
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: attachment.content_type?.startsWith("text/") ? "📝"
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: attachment.content_type?.startsWith("audio/") ? "🎶"
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: "📄"
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// 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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if (attachment.size > reg.ooye.max_file_size) {
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return {
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$type: "m.room.message",
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"m.mentions": mentions,
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msgtype: "m.text",
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body: `${emoji} Uploaded file: ${attachment.url} (${pb(attachment.size)})`,
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format: "org.matrix.custom.html",
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formatted_body: `${emoji} Uploaded file: <a href="${attachment.url}">${attachment.filename}</a> (${pb(attachment.size)})`
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}
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} else if (attachment.content_type?.startsWith("image/") && attachment.width && attachment.height) {
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return {
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$type: "m.room.message",
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"m.mentions": mentions,
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msgtype: "m.image",
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url: await file.uploadDiscordFileToMxc(attachment.url),
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external_url: attachment.url,
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body: attachment.filename,
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// TODO: filename: attachment.filename and then use body as the caption
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info: {
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mimetype: attachment.content_type,
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w: attachment.width,
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h: attachment.height,
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size: attachment.size
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}
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}
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} else if (attachment.content_type?.startsWith("video/") && attachment.width && attachment.height) {
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return {
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$type: "m.room.message",
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"m.mentions": mentions,
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msgtype: "m.video",
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url: await file.uploadDiscordFileToMxc(attachment.url),
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external_url: attachment.url,
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body: attachment.description || attachment.filename,
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filename: attachment.filename,
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info: {
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mimetype: attachment.content_type,
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w: attachment.width,
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h: attachment.height,
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size: attachment.size
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}
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}
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} else {
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return {
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$type: "m.room.message",
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"m.mentions": mentions,
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msgtype: "m.text",
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body: `Unsupported attachment:\n${JSON.stringify(attachment, null, 2)}\n${attachment.url}`
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}
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}
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}))
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events.push(...attachmentEvents)
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// Then stickers
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if (message.sticker_items) {
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const stickerEvents = await Promise.all(message.sticker_items.map(async stickerItem => {
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const format = file.stickerFormat.get(stickerItem.format_type)
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if (format?.mime) {
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let body = stickerItem.name
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const sticker = guild.stickers.find(sticker => sticker.id === stickerItem.id)
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if (sticker && sticker.description) body += ` - ${sticker.description}`
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return {
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$type: "m.sticker",
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"m.mentions": mentions,
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body,
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info: {
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mimetype: format.mime
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},
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url: await file.uploadDiscordFileToMxc(file.sticker(stickerItem))
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}
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} else {
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return {
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$type: "m.room.message",
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"m.mentions": mentions,
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msgtype: "m.text",
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body: "Unsupported sticker format. Name: " + stickerItem.name
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}
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}
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}))
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events.push(...stickerEvents)
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}
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// Rich replies
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if (repliedToEventId) {
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Object.assign(events[0], {
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"m.relates_to": {
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"m.in_reply_to": {
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event_id: repliedToEventId
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}
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}
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})
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}
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return events
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}
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module.exports.messageToEvent = messageToEvent
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