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

556 lines
21 KiB
JavaScript
Raw Permalink Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

// @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 {tag} = require("html-template-tag")
const passthrough = require("../../passthrough")
const {sync, db, discord, select, from} = passthrough
/** @type {import("../../matrix/file")} */
const file = sync.require("../../matrix/file")
/** @type {import("./emoji-to-key")} */
const emojiToKey = sync.require("./emoji-to-key")
/** @type {import("./lottie")} */
const lottie = sync.require("./lottie")
/** @type {import("../../m2d/converters/utils")} */
const mxUtils = sync.require("../../m2d/converters/utils")
/** @type {import("../../discord/utils")} */
const dUtils = sync.require("../../discord/utils")
const reg = require("../../matrix/read-registration")
const userRegex = reg.namespaces.users.map(u => new RegExp(u.regex))
/**
* @param {DiscordTypes.APIMessage} message
* @param {DiscordTypes.APIGuild} guild
* @param {boolean} useHTML
*/
function getDiscordParseCallbacks(message, guild, 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 `<a href="https://matrix.to/#/${mxid}">@${username}</a>`
} 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 `<a href="https://matrix.to/#/${row.room_id}">#${row.nick || row.name}</a>`
} else {
return `#${row.nick || row.name}`
}
},
/** @param {{animated: boolean, name: string, id: string, type: "discordEmoji"}} node */
emoji: node => {
if (useHTML) {
const mxc = select("emoji", "mxc_url", {emoji_id: node.id}).pluck().get()
assert(mxc) // All emojis should have been added ahead of time in the messageToEvent function.
return `<img data-mx-emoticon height="32" src="${mxc}" title=":${node.name}:" alt=":${node.name}:">`
} else {
return `:${node.name}:`
}
},
role: node => {
const role = guild.roles.find(r => r.id === node.id)
if (!role) {
// This fallback should only trigger if somebody manually writes a silly message, or if the cache breaks (hasn't happened yet).
// If the cache breaks, fix discord-packets.js to store role info properly.
return "@&" + node.id
} else if (useHTML && role.color) {
return `<font color="#${role.color.toString(16)}">@${role.name}</font>`
} else if (useHTML) {
return `<span data-mx-color="#ffffff" data-mx-bg-color="#414eef">@${role.name}</span>`
} else {
return `@${role.name}:`
}
},
everyone: node =>
"@room",
here: node =>
"@here"
}
}
const embedTitleParser = markdown.markdownEngine.parserFor({
...markdown.rules,
autolink: undefined,
link: undefined
})
/**
* @param {{room?: boolean, user_ids?: string[]}} mentions
* @param {DiscordTypes.APIAttachment} attachment
*/
async function attachmentToEvent(mentions, 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/") ? "🎶"
: "📄"
// 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>${emoji} Uploaded SPOILER file: <a href="${attachment.url}">${attachment.url}</a> (${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
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.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("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.description || attachment.filename,
filename: attachment.filename,
info: {
mimetype: attachment.content_type,
size: attachment.size
}
}
}
}
/**
* @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,
$sender: null
}]
}
/**
@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)
}
/**
* Translate Discord message links to Matrix event links.
* If OOYE has handled this message in the past, this is an instant database lookup.
* Otherwise, if OOYE knows the channel, this is a multi-second request to /timestamp_to_event to approximate.
* @param {string} content Partial or complete Discord message content
*/
async function transformContentMessageLinks(content) {
let offset = 0
for (const match of [...content.matchAll(/https:\/\/(?:ptb\.|canary\.|www\.)?discord(?:app)?\.com\/channels\/[0-9]+\/([0-9]+)\/([0-9]+)/g)]) {
assert(typeof match.index === "number")
const [_, channelID, messageID] = match
let result
const roomID = select("channel_room", "room_id", {channel_id: channelID}).pluck().get()
if (roomID) {
const eventID = select("event_message", "event_id", {message_id: messageID}).pluck().get()
if (eventID && roomID) {
result = `https://matrix.to/#/${roomID}/${eventID}`
} else {
const ts = dUtils.snowflakeToTimestampExact(messageID)
const {event_id} = await di.api.getEventForTimestamp(roomID, ts)
result = `https://matrix.to/#/${roomID}/${event_id}`
}
} else {
result = `${match[0]} [event is from another server]`
}
content = content.slice(0, match.index + offset) + result + content.slice(match.index + match[0].length + offset)
offset += result.length - match[0].length
}
return content
}
/**
* Translate links and emojis and mentions and stuff. Give back the text and HTML so they can be combined into bigger events.
* @param {string} content Partial or complete Discord message content
* @param {any} customOptions
* @param {any} customParser
* @param {any} customHtmlOutput
*/
async function transformContent(content, customOptions = {}, customParser = null, customHtmlOutput = null) {
content = await transformContentMessageLinks(content)
// 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)]
await Promise.all(emojiMatches.map(match => {
const id = match[3]
const name = match[2]
const animated = !!match[1]
return emojiToKey.emojiToKey({id, name, animated}) // Register the custom emoji if needed
}))
let html = markdown.toHTML(content, {
discordCallback: getDiscordParseCallbacks(message, guild, true),
...customOptions
}, customParser, customHtmlOutput)
let body = markdown.toHTML(content, {
discordCallback: getDiscordParseCallbacks(message, guild, false),
discordOnly: true,
escapeHTML: false,
...customOptions
}, null, null)
return {body, html}
}
async function addTextEvent(body, html, msgtype, {scanMentions}) {
// Star * prefix for fallback edits
if (options.includeEditFallbackStar) {
body = "* " + body
html = "* " + html
}
const flags = message.flags || 0
if (flags & 2) {
body = `[🔀 ${message.author.username}]\n` + body
html = `🔀 <strong>${message.author.username}</strong><br>` + 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 = `<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?.startsWith("> <:L1:")) {
// If the Discord user is replying to a Matrix user's reply, the fallback is going to contain the emojis and stuff from the bridged rep of the Matrix user's reply quote.
// Need to remove that previous reply rep from this fallback body. The fallbody body should only contain the Matrix user's actual message.
repliedToContent = repliedToContent.split("\n").slice(2).join("\n")
}
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, guild, true)
}, null, null)
const repliedToBody = markdown.toHTML(repliedToContent, {
discordCallback: getDiscordParseCallbacks(message, guild, false),
discordOnly: true,
escapeHTML: false,
}, null, null)
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)
}
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 + "**"
}
// Mentions scenario 3: scan the message content for written @mentions of matrix users. Allows for up to one space between @ and mention.
const matches = [...message.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)
}
}
}
// Text content appears first
if (message.content) {
const {body, html} = await transformContent(message.content)
await addTextEvent(body, html, msgtype, {scanMentions: true})
}
// Then attachments
const attachmentEvents = await Promise.all(message.attachments.map(attachmentToEvent.bind(null, mentions)))
events.push(...attachmentEvents)
// Then embeds
for (const embed of message.embeds || []) {
if (embed.type === "image") {
continue // Matrix's own URL previews are fine for images.
}
// 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
const rep = new mxUtils.MatrixStringBuilder()
// Author and URL into a paragraph
let authorNameText = embed.author?.name || ""
if (authorNameText && embed.author?.icon_url) authorNameText = `⏺️ ${authorNameText}` // using the emoji instead of an image
if (authorNameText || embed.author?.url) {
if (embed.author?.url) {
const authorURL = await transformContentMessageLinks(embed.author.url)
rep.addParagraph(`## ${authorNameText} ${authorURL}`, tag`<strong><a href="${authorURL}">${authorNameText}</a></strong>`)
} else {
rep.addParagraph(`## ${authorNameText}`, tag`<strong>${authorNameText}</strong>`)
}
}
// Title and URL into a paragraph
if (embed.title) {
const {body, html} = await transformContent(embed.title, {}, embedTitleParser, markdown.htmlOutput)
if (embed.url) {
rep.addParagraph(`## ${body} ${embed.url}`, tag`<strong><a href="${embed.url}">$${html}</a></strong>`)
} else {
rep.addParagraph(`## ${body}`, `<strong>${html}</strong>`)
}
} else if (embed.url) {
rep.addParagraph(`## ${embed.url}`, tag`<strong><a href="${embed.url}">${embed.url}</a></strong>`)
}
if (embed.description) {
const {body, html} = await transformContent(embed.description)
rep.addParagraph(body, html)
}
for (const field of embed.fields || []) {
const name = field.name.match(/^[\s­]*$/) ? {body: "", html: ""} : await transformContent(field.name, {}, embedTitleParser, markdown.htmlOutput)
const value = await transformContent(field.value)
const fieldRep = new mxUtils.MatrixStringBuilder()
.addLine(`### ${name.body}`, `<strong>${name.html}</strong>`, name.body)
.addLine(value.body, value.html, !!value.body)
rep.addParagraph(fieldRep.get().body, fieldRep.get().formatted_body)
}
if (embed.image?.url) rep.addParagraph(`📸 ${embed.image.url}`)
if (embed.video?.url) rep.addParagraph(`🎞️ ${embed.video.url}`)
if (embed.footer?.text) rep.addLine(`${embed.footer.text}`, tag`${embed.footer.text}`)
let {body, formatted_body: html} = rep.get()
body = body.split("\n").map(l => "> " + l).join("\n")
html = `<blockquote>${html}</blockquote>`
// Send as m.notice to apply the usual automated/subtle appearance, showing this wasn't actually typed by the person
await addTextEvent(body, html, "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