154 lines
5.5 KiB
JavaScript
154 lines
5.5 KiB
JavaScript
// @ts-check
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const assert = require("assert")
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const reg = require("../../matrix/read-registration")
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const Ty = require("../../types")
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const fetch = require("node-fetch").default
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const passthrough = require("../../passthrough")
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const {discord, sync, db, select} = passthrough
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/** @type {import("../../matrix/api")} */
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const api = sync.require("../../matrix/api")
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/** @type {import("../../matrix/file")} */
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const file = sync.require("../../matrix/file")
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/** @type {import("./register-user")} */
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const registerUser = sync.require("./register-user")
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/**
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* @typedef WebhookAuthor Discord API message->author. A webhook as an author.
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* @prop {string} username
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* @prop {string?} avatar
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* @prop {string} id
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*/
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/**
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* A sim is an account that is being simulated by the bridge to copy events from the other side.
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* @param {Ty.PkMessage} pkMessage
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* @returns mxid
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*/
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async function createSim(pkMessage) {
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// Choose sim name
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const simName = "_pk_" + pkMessage.member.id
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const localpart = reg.ooye.namespace_prefix + simName
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const mxid = `@${localpart}:${reg.ooye.server_name}`
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// Save chosen name in the database forever
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db.prepare("INSERT INTO sim (user_id, sim_name, localpart, mxid) VALUES (?, ?, ?, ?)").run(pkMessage.member.uuid, simName, localpart, mxid)
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// Register matrix user with that name
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try {
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await api.register(localpart)
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} catch (e) {
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// If user creation fails, manually undo the database change. Still isn't perfect, but should help.
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// (I would prefer a transaction, but it's not safe to leave transactions open across event loop ticks.)
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db.prepare("DELETE FROM sim WHERE user_id = ?").run(pkMessage.member.uuid)
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throw e
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}
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return mxid
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}
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/**
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* Ensure a sim is registered for the user.
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* If there is already a sim, use that one. If there isn't one yet, register a new sim.
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* @param {Ty.PkMessage} pkMessage
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* @returns {Promise<string>} mxid
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*/
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async function ensureSim(pkMessage) {
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let mxid = null
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const existing = select("sim", "mxid", {user_id: pkMessage.member.uuid}).pluck().get()
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if (existing) {
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mxid = existing
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} else {
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mxid = await createSim(pkMessage)
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}
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return mxid
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}
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/**
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* Ensure a sim is registered for the user and is joined to the room.
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* @param {Ty.PkMessage} pkMessage
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* @param {string} roomID
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* @returns {Promise<string>} mxid
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*/
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async function ensureSimJoined(pkMessage, roomID) {
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// Ensure room ID is really an ID, not an alias
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assert.ok(roomID[0] === "!")
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// Ensure user
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const mxid = await ensureSim(pkMessage)
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// Ensure joined
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const existing = select("sim_member", "mxid", {room_id: roomID, mxid}).pluck().get()
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if (!existing) {
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try {
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await api.inviteToRoom(roomID, mxid)
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await api.joinRoom(roomID, mxid)
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} catch (e) {
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if (e.message.includes("is already in the room.")) {
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// Sweet!
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} else {
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throw e
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}
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}
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db.prepare("INSERT OR IGNORE INTO sim_member (room_id, mxid) VALUES (?, ?)").run(roomID, mxid)
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}
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return mxid
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}
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/**
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* @param {Ty.PkMessage} pkMessage
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* @param {WebhookAuthor} author
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*/
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async function memberToStateContent(pkMessage, author) {
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// We prefer to use the member's avatar URL data since the image upload can be cached across channels,
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// unlike the userAvatar URL which is unique per channel, due to the webhook ID being in the URL.
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const avatar = pkMessage.member.avatar_url || pkMessage.member.webhook_avatar_url || pkMessage.system.avatar_url || file.userAvatar(author)
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const content = {
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displayname: author.username,
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membership: "join",
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"moe.cadence.ooye.pk_member": pkMessage.member
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}
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if (avatar) content.avatar_url = await file.uploadDiscordFileToMxc(avatar)
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return content
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}
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/**
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* Sync profile data for a sim user. This function follows the following process:
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* 1. Join the sim to the room if needed
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* 2. Make an object of what the new room member state content would be, including uploading the profile picture if it hasn't been done before
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* 3. Compare against the previously known state content, which is helpfully stored in the database
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* 4. If the state content has changed, send it to Matrix and update it in the database for next time
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* @param {WebhookAuthor} author
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* @param {Ty.PkMessage} pkMessage
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* @param {string} roomID
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* @returns {Promise<string>} mxid of the updated sim
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*/
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async function syncUser(author, pkMessage, roomID) {
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const mxid = await ensureSimJoined(pkMessage, roomID)
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// Update the sim_proxy table, so mentions can look up the original sender later
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db.prepare("INSERT OR IGNORE INTO sim_proxy (user_id, proxy_owner_id, displayname) VALUES (?, ?, ?)").run(pkMessage.member.uuid, pkMessage.sender, author.username)
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// Sync the member state
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const content = await memberToStateContent(pkMessage, author)
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const currentHash = registerUser._hashProfileContent(content, 0)
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const existingHash = select("sim_member", "hashed_profile_content", {room_id: roomID, mxid}).safeIntegers().pluck().get()
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// only do the actual sync if the hash has changed since we last looked
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if (existingHash !== currentHash) {
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await api.sendState(roomID, "m.room.member", mxid, content, mxid)
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db.prepare("UPDATE sim_member SET hashed_profile_content = ? WHERE room_id = ? AND mxid = ?").run(currentHash, roomID, mxid)
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}
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return mxid
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}
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/** @returns {Promise<Ty.PkMessage>} */
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function fetchMessage(messageID) {
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return fetch(`https://api.pluralkit.me/v2/messages/${messageID}`).then(res => res.json())
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}
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module.exports._memberToStateContent = memberToStateContent
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module.exports.ensureSim = ensureSim
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module.exports.ensureSimJoined = ensureSimJoined
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module.exports.syncUser = syncUser
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module.exports.fetchMessage = fetchMessage
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