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out-of-your-element-fork-th.../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 passthrough = require("../../passthrough")
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const { sync, db, discord } = passthrough
/** @type {import("../../matrix/file")} */
const file = sync.require("../../matrix/file")
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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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*/
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async function messageToEvent(message, guild) {
const events = []
// Text content appears first
if (message.content) {
const body = message.content
const html = markdown.toHTML(body, {
discordCallback: {
user: node => {
const mxid = db.prepare("SELECT mxid FROM sim WHERE discord_id = ?").pluck().get(node.id)
if (mxid) {
return "https://matrix.to/#/" + mxid
} else {
return "@" + node.id
}
},
channel: node => {
const roomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").pluck().get(node.id)
if (roomID) {
return "https://matrix.to/#/" + roomID
} else {
return "#" + node.id
}
},
role: node =>
"@&" + node.id,
everyone: node =>
"@room",
here: node =>
"@here"
}
}, null, null)
const isPlaintext = body === html
if (isPlaintext) {
events.push({
$type: "m.room.message",
msgtype: "m.text",
body: body
})
} else {
events.push({
$type: "m.room.message",
msgtype: "m.text",
body: body,
format: "org.matrix.custom.html",
formatted_body: html
})
}
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}
// Then attachments
const attachmentEvents = await Promise.all(message.attachments.map(async attachment => {
// TODO: handle large files differently - link them instead of uploading
if (attachment.content_type?.startsWith("image/") && attachment.width && attachment.height) {
return {
$type: "m.room.message",
msgtype: "m.image",
url: await file.uploadDiscordFileToMxc(attachment.url),
external_url: attachment.url,
body: attachment.filename,
// TODO: filename: attachment.filename and then use body as the caption
info: {
mimetype: attachment.content_type,
w: attachment.width,
h: attachment.height,
size: attachment.size
}
}
} else {
return {
$type: "m.room.message",
msgtype: "m.text",
body: "Unsupported attachment:\n" + JSON.stringify(attachment, null, 2)
}
}
}))
events.push(...attachmentEvents)
// 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)
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",
body,
info: {
mimetype: format.mime
},
url: await file.uploadDiscordFileToMxc(file.sticker(stickerItem))
}
} else {
return {
$type: "m.room.message",
msgtype: "m.text",
body: "Unsupported sticker format. Name: " + stickerItem.name
}
}
}))
events.push(...stickerEvents)
}
return events
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}
module.exports.messageToEvent = messageToEvent