feat(auth): LIT-4211 - Add initial auth package

- Define localStorage storage plugin w/ tests

Author: MaximusHaximus

packages/auth/src/index.ts

@@ -0,0 +1,11 @@
+import { getAuthManager } from './lib/auth-manager';
+import { localStorage } from './lib/storage';
+
+import type { LitAuthStorageProvider } from './lib/storage/types';
+import type { LitAuthData } from './lib/types';
+
+export type { LitAuthStorageProvider, LitAuthData };
+
+export const storagePlugins = { localStorage };
+
+export { getAuthManager };

packages/auth/src/lib/auth-manager.ts

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+import { nacl } from '@lit-protocol/nacl';
+import { SessionKeyPair } from '@lit-protocol/types';
+import { uint8arrayToString } from '@lit-protocol/uint8arrays';
+
+import type { LitAuthStorageProvider } from './storage/types';
+import type { LitAuthData } from '@lit-protocol/auth';
+
+interface LitAuthManagerConfig {
+  storage: LitAuthStorageProvider;
+}
+
+function generateSessionKeyPair(): SessionKeyPair {
+  const keyPair = nacl.sign.keyPair();
+
+  return {
+    publicKey: uint8arrayToString(keyPair.publicKey, 'base16'),
+    secretKey: uint8arrayToString(keyPair.secretKey, 'base16'),
+  };
+}
+
+async function tryGetCachedAuthData() {
+  // Use `storage` to see if there is cached auth data
+  // If error thrown trying to get it, error to caller or ??
+}
+
+async function tryGetAuthMethodFromAuthenticator() {
+  // Use authenticator `getAuthMethod()` method to get a new auth method
+}
+
+function validateAuthData(authData: LitAuthData) {
+  // Validate auth data is not expired, and is well-formed
+}
+
+async function signSessionKey({ storage }: LitAuthManagerConfig) {
+  // Use LitNodeClient to signSessionKey with AuthData
+}
+
+export function getAuthManager({ storage }: LitAuthManagerConfig) {
+  return {
+    getAuthContext() {},
+  };
+}

packages/auth/src/lib/authenticators/index.ts

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+// AuthProviders live in this dir tree