PKCE implementation

src/runtime/support.ts

@@ -0,0 +1,36 @@
+/*
+ * Source: https://docs.cotter.app/sdk-reference/api-for-other-mobile-apps/api-for-mobile-apps
+ */
+
+function dec2hex(dec: any) {
+  return ('0' + dec.toString(16)).substr(-2)
+}
+
+export function generateRandomString() {
+  const array = new Uint32Array(56 / 2);
+  window.crypto.getRandomValues(array);
+  return Array.from(array, dec2hex).join('');
+}
+
+function sha256(plain: any) {
+  const encoder = new TextEncoder();
+  const data = encoder.encode(plain);
+  return window.crypto.subtle.digest('SHA-256', data);
+}
+
+function base64urlencode(a: any) {
+  let str = "";
+  const bytes = new Uint8Array(a);
+  const len = bytes.byteLength;
+  for (let i = 0; i < len; i++) {
+    str += String.fromCharCode(bytes[i]);
+  }
+  return btoa(str)
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_")
+    .replace(/=+$/, "");
+}
+
+export async function getChallengeFromVerifier(v: any) {
+  return base64urlencode(await sha256(v));
+}