Initial, working login and logout with spotify

src/lib/server/auth/spotify.ts

@@ -0,0 +1,43 @@
+import { PUBLIC_CLIENT_ID, PUBLIC_REDIRECT_URI } from "$env/static/public";
+
+export const generateRandomString = (length: number) => {
+  const possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+  const values = crypto.getRandomValues(new Uint8Array(length));
+  return values.reduce((acc, x) => acc + possible[x % possible.length], "");
+}
+
+export const sha256 = async (plain: string) => {
+  const encoder = new TextEncoder()
+  const data = encoder.encode(plain)
+  return crypto.subtle.digest('SHA-256', data)
+}
+
+export const base64encode = (input: ArrayBuffer) => {
+  return btoa(String.fromCharCode(...new Uint8Array(input)))
+    .replace(/=/g, '')
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_');
+}
+
+export const getToken = async (code: string, codeVerifier: string) => {
+  const url = "https://accounts.spotify.com/api/token";
+  const payload = {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded'
+    },
+    body: new URLSearchParams({
+      client_id: PUBLIC_CLIENT_ID,
+      grant_type: 'authorization_code',
+      code,
+      redirect_uri: PUBLIC_REDIRECT_URI,
+      code_verifier: codeVerifier
+    })
+  };
+
+  const body = await fetch(url, payload);
+  const response = await body.json();
+
+  return response;
+}
+