76 lines
2.5 KiB
JavaScript
76 lines
2.5 KiB
JavaScript
// @ts-check
|
|
|
|
const assert = require("assert")
|
|
|
|
const passthrough = require("../../passthrough")
|
|
const { sync, db } = passthrough
|
|
|
|
/**
|
|
* Downcased and stripped username. Can only include a basic set of characters.
|
|
* https://spec.matrix.org/v1.6/appendices/#user-identifiers
|
|
* @param {import("discord-api-types/v10").APIUser} user
|
|
* @returns {string} localpart
|
|
*/
|
|
function downcaseUsername(user) {
|
|
// First, try to convert the username to the set of allowed characters
|
|
let downcased = user.username.toLowerCase()
|
|
// spaces to underscores...
|
|
.replace(/ /g, "_")
|
|
// remove disallowed characters...
|
|
.replace(/[^a-z0-9._=/-]*/g, "")
|
|
// remove leading and trailing dashes and underscores...
|
|
.replace(/(?:^[_-]*|[_-]*$)/g, "")
|
|
// The new length must be at least 2 characters (in other words, it should have some content)
|
|
if (downcased.length < 2) {
|
|
downcased = user.id
|
|
}
|
|
return downcased
|
|
}
|
|
|
|
/** @param {string[]} preferences */
|
|
function* generateLocalpartAlternatives(preferences) {
|
|
const best = preferences[0]
|
|
assert.ok(best)
|
|
// First, suggest the preferences...
|
|
for (const localpart of preferences) {
|
|
yield localpart
|
|
}
|
|
// ...then fall back to generating number suffixes...
|
|
let i = 2
|
|
while (true) {
|
|
yield best + (i++)
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Whole process for checking the database and generating the right sim name.
|
|
* @param {import("discord-api-types/v10").APIUser} user
|
|
* @returns {string}
|
|
*/
|
|
function userToSimName(user) {
|
|
assert.notEqual(user.discriminator, "0000", "cannot create user for a webhook")
|
|
|
|
// 1. Is sim user already registered?
|
|
const existing = db.prepare("SELECT sim_name FROM sim WHERE discord_id = ?").pluck().get(user.id)
|
|
if (existing) return existing
|
|
|
|
// 2. Register based on username (could be new or old format)
|
|
const downcased = downcaseUsername(user)
|
|
const preferences = [downcased]
|
|
if (user.discriminator.length === 4) { // Old style tag? If user.username is unavailable, try the full tag next
|
|
preferences.push(downcased + user.discriminator)
|
|
}
|
|
|
|
// Check for conflicts with already registered sims
|
|
/** @type {string[]} */
|
|
const matches = db.prepare("SELECT sim_name FROM sim WHERE sim_name LIKE ? ESCAPE '@'").pluck().all(downcased + "%")
|
|
// Keep generating until we get a suggestion that doesn't conflict
|
|
for (const suggestion of generateLocalpartAlternatives(preferences)) {
|
|
if (!matches.includes(suggestion)) return suggestion
|
|
}
|
|
|
|
throw new Error(`Ran out of suggestions when generating sim name. downcased: "${downcased}"`)
|
|
}
|
|
|
|
module.exports.userToSimName = userToSimName
|