Initial commit

frontend/src/lib/server/auth.js

@@ -0,0 +1,90 @@
+import { eq } from 'drizzle-orm';
+import { sha256 } from '@oslojs/crypto/sha2';
+import { encodeBase64url, encodeHexLowerCase } from '@oslojs/encoding';
+import { db } from '$lib/server/db';
+import * as table from '$lib/server/db/schema';
+
+const DAY_IN_MS = 1000 * 60 * 60 * 24;
+
+export const sessionCookieName = 'auth-session';
+
+export function generateSessionToken() {
+	const bytes = crypto.getRandomValues(new Uint8Array(18));
+	const token = encodeBase64url(bytes);
+	return token;
+}
+
+/**
+ * @param {string} token
+ * @param {string} userId
+ */
+export async function createSession(token, userId) {
+	const sessionId = encodeHexLowerCase(sha256(new TextEncoder().encode(token)));
+	const session = {
+		id: sessionId,
+		userId,
+		expiresAt: new Date(Date.now() + DAY_IN_MS * 30)
+	};
+	await db.insert(table.session).values(session);
+	return session;
+}
+
+/** @param {string} token */
+export async function validateSessionToken(token) {
+	const sessionId = encodeHexLowerCase(sha256(new TextEncoder().encode(token)));
+	const [result] = await db
+		.select({
+			// Adjust user table here to tweak returned data
+			user: { id: table.user.id, username: table.user.username },
+			session: table.session
+		})
+		.from(table.session)
+		.innerJoin(table.user, eq(table.session.userId, table.user.id))
+		.where(eq(table.session.id, sessionId));
+
+	if (!result) {
+		return { session: null, user: null };
+	}
+	const { session, user } = result;
+
+	const sessionExpired = Date.now() >= session.expiresAt.getTime();
+	if (sessionExpired) {
+		await db.delete(table.session).where(eq(table.session.id, session.id));
+		return { session: null, user: null };
+	}
+
+	const renewSession = Date.now() >= session.expiresAt.getTime() - DAY_IN_MS * 15;
+	if (renewSession) {
+		session.expiresAt = new Date(Date.now() + DAY_IN_MS * 30);
+		await db
+			.update(table.session)
+			.set({ expiresAt: session.expiresAt })
+			.where(eq(table.session.id, session.id));
+	}
+
+	return { session, user };
+}
+
+/** @param {string} sessionId */
+export async function invalidateSession(sessionId) {
+	await db.delete(table.session).where(eq(table.session.id, sessionId));
+}
+
+/**
+ * @param {import("@sveltejs/kit").RequestEvent} event
+ * @param {string} token
+ * @param {Date} expiresAt
+ */
+export function setSessionTokenCookie(event, token, expiresAt) {
+	event.cookies.set(sessionCookieName, token, {
+		expires: expiresAt,
+		path: '/'
+	});
+}
+
+/** @param {import("@sveltejs/kit").RequestEvent} event */
+export function deleteSessionTokenCookie(event) {
+	event.cookies.delete(sessionCookieName, {
+		path: '/'
+	});
+}