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src/workspaces/helpers/passkeys.ts

@@ -0,0 +1,61 @@
+// Frontend
+
+type PasskeyUser = {
+  id: string;
+  email: string;
+  firstName: string;
+  lastName: string;
+};
+
+export function arrayBufferToBase64(buffer: ArrayBuffer) {
+  const bytes = new Uint8Array(buffer);
+  const binary = Array.from(bytes, (byte) => String.fromCharCode(byte)).join('');
+  return window.btoa(binary);
+}
+
+export function getCredentialPayload(challenge: number[], user: PasskeyUser) {
+  return {
+    challenge: new Uint8Array(challenge),
+    rp: {
+      name: 'Pertento AI',
+    },
+    user: {
+      id: Uint8Array.from(atob(btoa(user.id)), (c) => c.charCodeAt(0)),
+      name: user.email,
+      displayName: `${user.firstName} ${user.lastName}`,
+    },
+    pubKeyCredParams: [
+      { type: 'public-key' as const, alg: -7 },
+      { type: 'public-key' as const, alg: -257 },
+    ],
+  };
+}
+
+export function getSigninPayload(challenge: number[], credentialIds: string[]) {
+  return {
+    challenge: new Uint8Array(challenge),
+    allowCredentials: credentialIds.map((id) => {
+      const urlSafeId = id.replace(/-/g, '+').replace(/_/g, '/');
+      const decodedId = atob(urlSafeId);
+      return {
+        type: 'public-key' as const,
+        id: Uint8Array.from(decodedId, (c) => c.charCodeAt(0)),
+      };
+    }),
+    userVerification: 'preferred' as const,
+  };
+}
+
+// Backend
+
+export function createChallenge() {
+  const challenge = crypto.randomUUID();
+  const hex = challenge.replace(/-/g, '');
+  const array: number[] = new Array(hex.length / 2);
+  for (let i = 0; i < hex.length; i += 2) {
+    array[i / 2] = parseInt(hex.substr(i, 2), 16);
+  }
+  return array;
+}
+
+export const hexToString = (array: number[]) => array.map((byte) => byte.toString(16).padStart(2, '0')).join('');