out-of-your-element/matrix/file.js

62 lines
1.7 KiB
JavaScript

// @ts-check
const fetch = require("node-fetch").default
const passthrough = require("../passthrough")
const { sync, db } = passthrough
/** @type {import("./mreq")} */
const mreq = sync.require("./mreq")
const DISCORD_IMAGES_BASE = "https://cdn.discordapp.com"
const IMAGE_SIZE = 1024
/** @type {Map<string, Promise<string>>} */
const inflight = new Map()
/**
* @param {string} path
*/
async function uploadDiscordFileToMxc(path) {
const url = DISCORD_IMAGES_BASE + path
// Are we uploading this file RIGHT NOW? Return the same inflight promise with the same resolution
let existing = inflight.get(url)
if (typeof existing === "string") {
return existing
}
// Has this file already been uploaded in the past? Grab the existing copy from the database.
existing = db.prepare("SELECT mxc_url FROM file WHERE discord_url = ?").pluck().get(url)
if (typeof existing === "string") {
return existing
}
// Download from Discord
const promise = fetch(url, {}).then(/** @param {import("node-fetch").Response} res */ async res => {
const body = res.body
// Upload to Matrix
/** @type {import("../types").R.FileUploaded} */
const root = await mreq.mreq("POST", "/media/v3/upload", body, {
headers: {
"Content-Type": res.headers.get("content-type")
}
})
// Store relationship in database
db.prepare("INSERT INTO file (discord_url, mxc_url) VALUES (?, ?)").run(url, root.content_uri)
inflight.delete(url)
return root.content_uri
})
inflight.set(url, promise)
return promise
}
function guildIcon(guild) {
return `/icons/${guild.id}/${guild.icon}.png?size=${IMAGE_SIZE}`
}
module.exports.guildIcon = guildIcon
module.exports.uploadDiscordFileToMxc = uploadDiscordFileToMxc