Implement full auth flow in iOS

src/platform/urls.tsx

@@ -1,4 +1,5 @@
-import {isIOS, isAndroid} from './detection'
+import {Linking} from 'react-native'
+import {isIOS, isAndroid, isNative, isWeb} from './detection'
 
 export function makeAppUrl(path = '') {
   if (isIOS) {
@@ -10,3 +11,27 @@ export function makeAppUrl(path = '') {
     return `${window.location.origin}${path}`
   }
 }
+
+export function extractHashFragment(url: string): string {
+  return url.split('#')[1] || ''
+}
+
+export async function getInitialURL(): Promise<string> {
+  if (isNative) {
+    const url = await Linking.getInitialURL()
+    if (url) {
+      return url
+    }
+    return makeAppUrl()
+  } else {
+    // @ts-ignore window exists -prf
+    return window.location.toString()
+  }
+}
+
+export function clearHash() {
+  if (isWeb) {
+    // @ts-ignore window exists -prf
+    window.location.hash = ''
+  }
+}

src/state/auth.ts

@@ -3,7 +3,12 @@ import * as auth from '@adxp/auth'
 import * as ucan from 'ucans'
 import {InAppBrowser} from 'react-native-inappbrowser-reborn'
 import {isWeb} from '../platform/detection'
-import {makeAppUrl} from '../platform/urls'
+import {
+  getInitialURL,
+  extractHashFragment,
+  clearHash,
+  makeAppUrl,
+} from '../platform/urls'
 import * as storage from './storage'
 import * as env from '../env'
 
@@ -20,26 +25,28 @@ export async function logout(authStore: ReactNativeStore) {
   await authStore.reset()
 }
 
-export async function parseUrlForUcan() {
-  if (isWeb) {
-    // @ts-ignore window is defined -prf
-    const fragment = window.location.hash
-    if (fragment.length < 1) {
-      return undefined
-    }
-    try {
-      const ucan = await auth.parseLobbyResponseHashFragment(fragment)
-      // @ts-ignore window is defined -prf
-      window.location.hash = ''
-      return ucan
-    } catch (err) {
-      return undefined
-    }
-  } else {
-    // TODO
+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) {
   const did = await authStore.getDid()
   const returnUrl = makeAppUrl()
@@ -53,6 +60,7 @@ export async function requestAppUcan(authStore: ReactNativeStore) {
   }
 
   if (await InAppBrowser.isAvailable()) {
+    // use in-app browser
     const res = await InAppBrowser.openAuth(url, returnUrl, {
       // iOS Properties
       ephemeralWebSession: false,
@@ -62,12 +70,20 @@ export async function requestAppUcan(authStore: ReactNativeStore) {
       enableDefaultShare: false,
     })
     if (res.type === 'success' && res.url) {
-      Linking.openURL(res.url)
+      const fragment = extractHashFragment(res.url)
+      if (fragment) {
+        const ucan = await parseUrlForUcan(fragment)
+        if (ucan) {
+          await authStore.addUcan(ucan)
+          return true
+        }
+      }
     } else {
-      console.error('Bad response', res)
+      console.log('Not completed', res)
       return false
     }
   } else {
+    // use system browser
     Linking.openURL(url)
   }
   return true

src/state/index.ts

@@ -7,6 +7,7 @@ import {
 import {Environment} from './env'
 import * as storage from './storage'
 import * as auth from './auth'
+import * as urls from '../platform/urls'
 
 const ROOT_STATE_STORAGE_KEY = 'root'
 
@@ -32,9 +33,9 @@ export async function setupState() {
   if (env.authStore) {
     const isAuthed = await auth.isAuthed(env.authStore)
     rootStore.session.setAuthed(isAuthed)
-    const ucan = await auth.parseUrlForUcan()
-    if (ucan) {
-      await env.authStore.addUcan(ucan)
+
+    // handle redirect from auth
+    if (await auth.initialLoadUcanCheck(env.authStore)) {
       rootStore.session.setAuthed(true)
     }
   }