88 lines
2.8 KiB
TypeScript
88 lines
2.8 KiB
TypeScript
/**
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* Makes invites, and checks and claims them at sign-up. An invite works once,
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* for `UNUSED_INVITES_RETENTION_DAYS` days. `routes/invites.ts` makes and
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* checks them, and `POST /api/users` claims one.
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*
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* @module
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*/
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import { randomBytes } from "node:crypto";
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import { APIException } from "../lib/api-exception.ts";
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import { db } from "../db/connection.ts";
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import { isInviteRow } from "../model/invite.ts";
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import { UNUSED_INVITES_RETENTION_DAYS } from "../config.ts";
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/** Returns 128 random bits as 22 URL-safe characters. */
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function generateInviteToken(): string {
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return randomBytes(16).toString("base64url");
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}
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/**
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* Makes an invite from `inviterId` and returns its token, which the client
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* puts in the invite link.
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*/
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export function createInvite(inviterId: string): string {
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const token = generateInviteToken();
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db.prepare(
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`INSERT INTO invites (token, inviter_id, created_at) VALUES (?, ?, ?);`,
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).run(token, inviterId, new Date().toISOString());
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return token;
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}
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/**
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* Returns the id of the inviter when invite `token` is unused and still in its
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* window, which is the one after which `db/startup.ts` purges it. It doesn't
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* claim the invite: sign-up goes through {@link claimInvite}.
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*
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* @throws {APIException} 404 when the invite doesn't exist or has expired,
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* 409 when it has been used.
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*/
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export function validateInvite(token: string): string {
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const row = db.prepare(
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`SELECT token, inviter_id, used_at, created_at FROM invites WHERE token = ?;`,
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).get(token);
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if (!row || !isInviteRow(row)) {
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throw new APIException(404, "Invalid or expired invite");
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}
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if (row.used_at !== null) {
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throw new APIException(409, "Invite already used");
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}
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const expiresAt = new Date(row.created_at).getTime() +
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UNUSED_INVITES_RETENTION_DAYS * 24 * 60 * 60 * 1000;
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if (Date.now() > expiresAt) {
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throw new APIException(404, "Invalid or expired invite");
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}
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return row.inviter_id;
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}
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/**
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* Marks invite `token` used and returns the inviter's id. Call it before the
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* async account creation, and {@link releaseInvite} if that fails: checking
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* first and marking after would let parallel sign-ups share one invite.
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*
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* @throws {APIException} 404 when the invite doesn't exist or has expired,
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* 409 when it has been used.
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*/
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export function claimInvite(token: string): string {
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const inviterId = validateInvite(token);
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const result = db.prepare(
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`UPDATE invites SET used_at = ? WHERE token = ? AND used_at IS NULL;`,
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).run(new Date().toISOString(), token);
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if (result.changes === 0) {
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throw new APIException(409, "Invite already used");
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}
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return inviterId;
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}
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/**
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* Makes a claimed invite usable again, when the sign-up that claimed it
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* failed.
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*/
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export function releaseInvite(token: string): void {
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db.prepare(`UPDATE invites SET used_at = NULL WHERE token = ?;`).run(token);
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}
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