register -> invite -> join -> send flow

d2m/actions/register-user.js

@@ -1,6 +1,7 @@
 // @ts-check
 
 const assert = require("assert")
+const reg = require("../../matrix/read-registration")
 
 const passthrough = require("../../passthrough")
 const { discord, sync, db } = passthrough
@@ -14,10 +15,58 @@ const userToMxid = sync.require("../converters/user-to-mxid")
 /**
  * A sim is an account that is being simulated by the bridge to copy events from the other side.
  * @param {import("discord-api-types/v10").APIUser} user
+ * @returns mxid
  */
 async function createSim(user) {
+	// Choose sim name
 	const simName = userToMxid.userToSimName(user)
-	const appservicePrefix = "_ooye_"
-	const localpart = appservicePrefix + simName
+	const localpart = reg.namespace_prefix + simName
+	const mxid = "@" + localpart + ":cadence.moe"
+
+	// Save chosen name in the database forever
+	db.prepare("INSERT INTO sim (discord_id, sim_name, localpart, mxid) VALUES (?, ?, ?, ?)").run(user.id, simName, localpart, mxid)
+
+	// Register matrix user with that name
 	await api.register(localpart)
+	return mxid
 }
+
+/**
+ * Ensure a sim is registered for the user.
+ * If there is already a sim, use that one. If there isn't one yet, register a new sim.
+ * @returns mxid
+ */
+async function ensureSim(user) {
+	let mxid = null
+	const existing = db.prepare("SELECT mxid FROM sim WHERE discord_id = ?").pluck().get(user.id)
+	if (existing) {
+		mxid = existing
+	} else {
+		mxid = await createSim(user)
+	}
+	return mxid
+}
+
+/**
+ * Ensure a sim is registered for the user and is joined to the room.
+ * @returns mxid
+ */
+async function ensureSimJoined(user, roomID) {
+	// Ensure room ID is really an ID, not an alias
+	assert.ok(roomID[0] === "!")
+
+	// Ensure user
+	const mxid = await ensureSim(user)
+
+	// Ensure joined
+	const existing = db.prepare("SELECT * FROM sim_member WHERE room_id = ? and mxid = ?").get(roomID, mxid)
+	if (!existing) {
+		await api.inviteToRoom(roomID, mxid)
+		await api.joinRoom(roomID, mxid)
+		db.prepare("INSERT INTO sim_member (room_id, mxid) VALUES (?, ?)").run(roomID, mxid)
+	}
+	return mxid
+}
+
+module.exports.ensureSim = ensureSim
+module.exports.ensureSimJoined = ensureSimJoined