1 files changed, 116 insertions, 0 deletions
diff --git a/src/state/lib/auth.ts b/src/state/lib/auth.ts
new file mode 100644
index 000000000..d758745ed
--- /dev/null
+++ b/src/state/lib/auth.ts
@@ -0,0 +1,116 @@
+import * as auth from '@adxp/auth'
+import * as ucan from 'ucans'
+import {
+  getInitialURL,
+  extractHashFragment,
+  clearHash,
+} from '../../platform/urls'
+import * as authFlow from '../../platform/auth-flow'
+import * as storage from './storage'
+
+const SCOPE = auth.writeCap(
+  'did:key:z6MkfRiFMLzCxxnw6VMrHK8pPFt4QAHS3jX3XM87y9rta6kP',
+  'did:example:microblog',
+)
+
+export async function isAuthed(authStore: ReactNativeStore) {
+  return await authStore.hasUcan(SCOPE)
+}
+
+export async function logout(authStore: ReactNativeStore) {
+  await authStore.reset()
+}
+
+export async function parseUrlForUcan(fragment: string) {
+  try {
+    return await auth.parseLobbyResponseHashFragment(fragment)
+  } catch (err) {
+    return undefined
+  }
+}
+
+export async function initialLoadUcanCheck(authStore: ReactNativeStore) {
+  let wasAuthed = false
+  const fragment = extractHashFragment(await getInitialURL())
+  if (fragment) {
+    const ucan = await parseUrlForUcan(fragment)
+    if (ucan) {
+      await authStore.addUcan(ucan)
+      wasAuthed = true
+      clearHash()
+    }
+  }
+  return wasAuthed
+}
+
+export async function requestAppUcan(authStore: ReactNativeStore) {
+  return authFlow.requestAppUcan(authStore, SCOPE)
+}
+
+export class ReactNativeStore extends auth.AuthStore {
+  private keypair: ucan.EdKeypair
+  private ucanStore: ucan.Store
+
+  constructor(keypair: ucan.EdKeypair, ucanStore: ucan.Store) {
+    super()
+    this.keypair = keypair
+    this.ucanStore = ucanStore
+  }
+
+  static async load(): Promise<ReactNativeStore> {
+    const keypair = await ReactNativeStore.loadOrCreateKeypair()
+
+    const storedUcans = await ReactNativeStore.getStoredUcanStrs()
+    const ucanStore = await ucan.Store.fromTokens(storedUcans)
+
+    return new ReactNativeStore(keypair, ucanStore)
+  }
+
+  static async loadOrCreateKeypair(): Promise<ucan.EdKeypair> {
+    const storedKey = await storage.loadString('adxKey')
+    if (storedKey) {
+      return ucan.EdKeypair.fromSecretKey(storedKey)
+    } else {
+      // @TODO: again just stand in since no actual root keys
+      const keypair = await ucan.EdKeypair.create({exportable: true})
+      storage.saveString('adxKey', await keypair.export())
+      return keypair
+    }
+  }
+
+  static async getStoredUcanStrs(): Promise<string[]> {
+    const storedStr = await storage.loadString('adxUcans')
+    if (!storedStr) {
+      return []
+    }
+    return storedStr.split(',')
+  }
+
+  static setStoredUcanStrs(ucans: string[]): void {
+    storage.saveString('adxUcans', ucans.join(','))
+  }
+
+  protected async getKeypair(): Promise<ucan.EdKeypair> {
+    return this.keypair
+  }
+
+  async addUcan(token: ucan.Chained): Promise<void> {
+    this.ucanStore.add(token)
+    const storedUcans = await ReactNativeStore.getStoredUcanStrs()
+    ReactNativeStore.setStoredUcanStrs([...storedUcans, token.encoded()])
+  }
+
+  async getUcanStore(): Promise<ucan.Store> {
+    return this.ucanStore
+  }
+
+  async clear(): Promise<void> {
+    storage.clear()
+  }
+
+  async reset(): Promise<void> {
+    this.clear()
+    this.keypair = await ReactNativeStore.loadOrCreateKeypair()
+    this.ucanStore = await ucan.Store.fromTokens([])
+  }
+}