out-of-your-element/m2d/actions/send-event.js

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// @ts-check
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const Ty = require("../../types")
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const DiscordTypes = require("discord-api-types/v10")
const {Readable} = require("stream")
const assert = require("assert").strict
const crypto = require("crypto")
const fetch = require("node-fetch").default
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const passthrough = require("../../passthrough")
const {sync, discord, db, select} = passthrough
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/** @type {import("./channel-webhook")} */
const channelWebhook = sync.require("./channel-webhook")
/** @type {import("../converters/event-to-message")} */
const eventToMessage = sync.require("../converters/event-to-message")
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/** @type {import("../../matrix/api")}) */
const api = sync.require("../../matrix/api")
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/**
* @param {DiscordTypes.RESTPostAPIWebhookWithTokenJSONBody & {files?: {name: string, file: Buffer | Readable}[], pendingFiles?: ({name: string, url: string} | {name: string, url: string, key: string, iv: string} | {name: string, buffer: Buffer | Readable})[]}} message
* @returns {Promise<DiscordTypes.RESTPostAPIWebhookWithTokenJSONBody & {files?: {name: string, file: Buffer | Readable}[]}>}
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*/
async function resolvePendingFiles(message) {
if (!message.pendingFiles) return message
const files = await Promise.all(message.pendingFiles.map(async p => {
if ("buffer" in p) {
return {
name: p.name,
file: p.buffer
}
}
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if ("key" in p) {
// Encrypted file
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const d = crypto.createDecipheriv("aes-256-ctr", Buffer.from(p.key, "base64url"), Buffer.from(p.iv, "base64url"))
// @ts-ignore
fetch(p.url).then(res => res.body.pipe(d))
return {
name: p.name,
file: d
}
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} else {
// Unencrypted file
/** @type {Readable} */ // @ts-ignore
const body = await fetch(p.url).then(res => res.body)
return {
name: p.name,
file: body
}
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}
}))
const newMessage = {
...message,
files: files.concat(message.files || [])
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}
delete newMessage.pendingFiles
return newMessage
}
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/** @param {Ty.Event.Outer_M_Room_Message | Ty.Event.Outer_M_Room_Message_File | Ty.Event.Outer_M_Sticker} event */
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async function sendEvent(event) {
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const row = select("channel_room", ["channel_id", "thread_parent"], {room_id: event.room_id}).get()
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if (!row) return // allow the bot to exist in unbridged rooms, just don't do anything with it
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let channelID = row.channel_id
let threadID = undefined
if (row.thread_parent) {
threadID = channelID
channelID = row.thread_parent // it's the thread's parent... get with the times...
}
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// @ts-ignore
const guildID = discord.channels.get(channelID).guild_id
const guild = discord.guilds.get(guildID)
assert(guild)
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// no need to sync the matrix member to the other side. but if I did need to, this is where I'd do it
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let {messagesToEdit, messagesToSend, messagesToDelete} = await eventToMessage.eventToMessage(event, guild, {api})
messagesToEdit = await Promise.all(messagesToEdit.map(async e => {
e.message = await resolvePendingFiles(e.message)
return e
}))
messagesToSend = await Promise.all(messagesToSend.map(message => {
return resolvePendingFiles(message)
}))
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let eventPart = 0 // 0 is primary, 1 is supporting
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/** @type {DiscordTypes.APIMessage[]} */
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const messageResponses = []
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for (const data of messagesToEdit) {
const messageResponse = await channelWebhook.editMessageWithWebhook(channelID, data.id, data.message, threadID)
eventPart = 1
messageResponses.push(messageResponse)
}
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for (const id of messagesToDelete) {
await channelWebhook.deleteMessageWithWebhook(channelID, id, threadID)
}
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for (const message of messagesToSend) {
const reactionPart = messagesToEdit.length === 0 && message === messagesToSend[messagesToSend.length - 1] ? 0 : 1
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const messageResponse = await channelWebhook.sendMessageWithWebhook(channelID, message, threadID)
db.prepare("REPLACE INTO message_channel (message_id, channel_id) VALUES (?, ?)").run(messageResponse.id, threadID || channelID)
db.prepare("INSERT INTO event_message (event_id, event_type, event_subtype, message_id, part, reaction_part, source) VALUES (?, ?, ?, ?, ?, ?, 0)").run(event.event_id, event.type, event.content["msgtype"] || null, messageResponse.id, eventPart, reactionPart) // source 0 = matrix
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eventPart = 1
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messageResponses.push(messageResponse)
}
return messageResponses
}
module.exports.sendEvent = sendEvent