Initial, working login and logout with spotify

src/routes/login/+page.server.ts

@@ -0,0 +1,37 @@
+import { PUBLIC_CLIENT_ID, PUBLIC_REDIRECT_URI } from "$env/static/public";
+import { redirect } from "@sveltejs/kit";
+import { generateRandomString, sha256, base64encode } from '$lib/server/auth/spotify';
+import type { PageServerLoad } from "../$types";
+import { db } from "$lib/server/db";
+import { states } from "$lib/server/db/schema";
+
+export const load: PageServerLoad = async () => {
+    const scope = 'user-read-private user-read-email';
+    const authUrl = new URL("https://accounts.spotify.com/authorize");
+
+    const verifier = generateRandomString(64);
+    const state = generateRandomString(64);
+
+    const s: typeof states.$inferInsert = {
+        id: state,
+        codeVerifier: verifier
+    };
+
+    await db.insert(states).values(s);
+
+    const hashed = await sha256(verifier);
+    const codeChallenge = base64encode(hashed);
+
+    const params = {
+        response_type: 'code',
+        client_id: PUBLIC_CLIENT_ID,
+        scope,
+        code_challenge_method: 'S256',
+        code_challenge: codeChallenge,
+        redirect_uri: PUBLIC_REDIRECT_URI,
+        state
+    }
+
+    authUrl.search = new URLSearchParams(params).toString();
+    redirect(307, authUrl);
+};