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 {tag} = require("html-template-tag")
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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("./emoji-to-key")} */
const emojiToKey = sync.require("./emoji-to-key")
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/** @type {import("../actions/lottie")} */
const lottie = sync.require("../actions/lottie")
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/** @type {import("../../m2d/converters/utils")} */
const mxUtils = sync.require("../../m2d/converters/utils")
/** @type {import("../../discord/utils")} */
const dUtils = sync.require("../../discord/utils")
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const reg = require("../../matrix/read-registration")
const userRegex = reg.namespaces.users.map(u => new RegExp(u.regex))
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/**
* @param {DiscordTypes.APIMessage} message
* @param {DiscordTypes.APIGuild} guild
* @param {boolean} useHTML
*/
function getDiscordParseCallbacks(message, guild, 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 `@${username}:`
}
},
/** @param {{id: string, type: "discordChannel", row: {room_id: string, name: string, nick: string?}?, via: string}} node */
channel: node => {
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if (!node.row) {
return `#[channel-from-an-unknown-server]` // fallback for when this channel is not bridged
} else if (useHTML) {
return `<a href="https://matrix.to/#/${node.row.room_id}?${node.via}">#${node.row.nick || node.row.name}</a>`
} else {
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return `#${node.row.nick || node.row.name}`
}
},
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/** @param {{animated: boolean, name: string, id: string, type: "discordEmoji"}} node */
emoji: node => {
if (useHTML) {
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const mxc = select("emoji", "mxc_url", {emoji_id: node.id}).pluck().get()
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assert(mxc) // All emojis should have been added ahead of time in the messageToEvent function.
return `<img data-mx-emoticon height="32" src="${mxc}" title=":${node.name}:" alt=":${node.name}:">`
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} else {
return `:${node.name}:`
}
},
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role: node => {
const role = guild.roles.find(r => r.id === node.id)
if (!role) {
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// This fallback should only trigger if somebody manually writes a silly message, or if the cache breaks (hasn't happened yet).
// If the cache breaks, fix discord-packets.js to store role info properly.
return "@&" + node.id
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} else if (useHTML && role.color) {
return `<font color="#${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"
}
}
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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",
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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
}
}
}
}
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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,
$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 = {}
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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
}
} else if (dUtils.isWebhookMessage(message) && message.embeds[0]?.author?.name?.endsWith("↩️") && message.embeds[0].description?.startsWith("**[Reply to:]")) {
const match = message.embeds[0].description.match(/\/channels\/[0-9]*\/[0-9]*\/([0-9]{2,})/)
if (match) {
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(match[1])
if (row) {
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/*
we generate a partial referenced_message based on what PK provided. we don't need everything, since this will only be used for further message-to-event converting.
the following properties are necessary:
- content: used for generating the reply fallback
- author: used for the top of the reply fallback (only used for discord authors. for matrix authors, repliedToEventSenderMxid is set.)
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*/
message.referenced_message = {
content: message.embeds[0].description.replace(/^.*?\)\*\*\s*/, ""),
// @ts-ignore
author: {
username: message.embeds[0].author.name.replace(/\s*↩️\s*$/, "")
}
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}
message.embeds.shift()
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)
}
/** @type {Map<string, Promise<string>>} */
const viaMemo = new Map()
/**
* @param {string} roomID
* @returns {Promise<string>} string encoded URLSearchParams
*/
function getViaServersMemo(roomID) {
// @ts-ignore
if (viaMemo.has(roomID)) return viaMemo.get(roomID)
const promise = mxUtils.getViaServersQuery(roomID, di.api).then(p => p.toString())
viaMemo.set(roomID, promise)
return promise
}
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/**
* 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.
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* @param {string} content Partial or complete Discord message content
*/
async function transformContentMessageLinks(content) {
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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()
const via = await getViaServersMemo(roomID)
if (eventID && roomID) {
result = `https://matrix.to/#/${roomID}/${eventID}?${via}`
} else {
const ts = dUtils.snowflakeToTimestampExact(messageID)
const {event_id} = await di.api.getEventForTimestamp(roomID, ts)
result = `https://matrix.to/#/${roomID}/${event_id}?${via}`
}
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} else {
result = `${match[0]} [event is from another server]`
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}
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content = content.slice(0, match.index + offset) + result + content.slice(match.index + match[0].length + offset)
offset += result.length - match[0].length
}
return content
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}
/**
* 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)
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// 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)]
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await Promise.all(emojiMatches.map(match => {
const id = match[3]
const name = match[2]
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const animated = !!match[1]
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return emojiToKey.emojiToKey({id, name, animated}) // Register the custom emoji if needed
}))
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async function transformParsedVia(parsed) {
for (const node of parsed) {
if (node.type === "discordChannel") {
node.row = select("channel_room", ["room_id", "name", "nick"], {channel_id: node.id}).get()
if (node.row?.room_id) {
node.via = await getViaServersMemo(node.row.room_id)
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}
}
if (Array.isArray(node.content)) {
await transformParsedVia(node.content)
}
}
return parsed
}
let html = await markdown.toHtmlWithPostParser(content, transformParsedVia, {
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discordCallback: getDiscordParseCallbacks(message, guild, true),
...customOptions
}, customParser, customHtmlOutput)
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let body = await markdown.toHtmlWithPostParser(content, transformParsedVia, {
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discordCallback: getDiscordParseCallbacks(message, guild, false),
discordOnly: true,
escapeHTML: false,
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...customOptions
}, null, null)
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return {body, html}
}
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// FIXME: What was the scanMentions parameter supposed to activate? It's unused.
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async function addTextEvent(body, html, msgtype, {scanMentions}) {
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// 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
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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?.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, {
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discordCallback: getDiscordParseCallbacks(message, guild, true)
}, null, null)
const repliedToBody = markdown.toHTML(repliedToContent, {
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discordCallback: getDiscordParseCallbacks(message, guild, 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 + "**"
}
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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.
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)
}
}
}
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// Text content appears first
if (message.content) {
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const {body, html} = await transformContent(message.content)
await addTextEvent(body, html, msgtype, {scanMentions: true})
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}
// Then attachments
const attachmentEvents = await Promise.all(message.attachments.map(attachmentToEvent.bind(null, mentions)))
events.push(...attachmentEvents)
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// Then embeds
for (const embed of message.embeds || []) {
if (embed.type === "image") {
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continue // Matrix's own URL previews are fine for images.
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}
// 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
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const rep = new mxUtils.MatrixStringBuilder()
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// Author and URL into a paragraph
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let authorNameText = embed.author?.name || ""
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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)
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rep.addParagraph(`## ${authorNameText} ${authorURL}`, tag`<strong><a href="${authorURL}">${authorNameText}</a></strong>`)
} else {
rep.addParagraph(`## ${authorNameText}`, tag`<strong>${authorNameText}</strong>`)
}
}
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// 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}">${embed.url}</a></strong>`)
}
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if (embed.description) {
const {body, html} = await transformContent(embed.description)
rep.addParagraph(body, html)
}
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for (const field of embed.fields || []) {
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const name = field.name.match(/^[\s­]*$/) ? {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)
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}
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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`${embed.footer.text}`)
let {body, formatted_body: html} = rep.get()
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body = body.split("\n").map(l => "| " + l).join("\n")
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html = `<blockquote>${html}</blockquote>`
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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(body, html, "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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assert(format?.mime)
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if (format?.mime === "lottie") {
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const {mxc_url, info} = await lottie.convert(stickerItem)
return {
$type: "m.sticker",
"m.mentions": mentions,
body: stickerItem.name,
info,
url: mxc_url
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}
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} else {
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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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}
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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