fix(expo): parse AppAuth redirect URL schemes

Author: zibs

.changeset/fix-expo-swift-appdelegate.md

@@ -2,4 +2,4 @@
 "react-native-app-auth": patch
 ---
 
-Fix Expo config plugin support for Swift AppDelegate templates that omit `public` before the AppDelegate class declaration.
+Fix Expo config plugin support for Swift AppDelegate templates that omit `public` before the AppDelegate class declaration, and correctly extract URL schemes from AppAuth redirect URLs that use a single slash.

packages/react-native-app-auth/plugin/src/__tests__/index.test.ts

@@ -0,0 +1,11 @@
+import { getRedirectUrlScheme } from '../index';
+
+describe('getRedirectUrlScheme', () => {
+  it('extracts a scheme from single-slash AppAuth redirect URLs', () => {
+    expect(getRedirectUrlScheme('io.identityserver.demo:/oauthredirect')).toBe('io.identityserver.demo');
+  });
+
+  it('extracts a scheme from double-slash redirect URLs', () => {
+    expect(getRedirectUrlScheme('rnaa-demo://oauthredirect')).toBe('rnaa-demo');
+  });
+});

packages/react-native-app-auth/plugin/src/index.ts

@@ -11,14 +11,20 @@ import { withAppAuthAppBuildGradle } from './android';
 
 const packageJson = require('../../package.json');
 
+export const getRedirectUrlScheme = (redirectUrl?: string): string | undefined => {
+  return redirectUrl?.split(':')[0];
+};
+
 const withAppAuth: AppAuthConfigPlugin = (config, props) => {
+  const redirectUrlScheme = getRedirectUrlScheme(props?.redirectUrls?.[0]);
+
   // Transform redirectUrls configuration to platform-specific format
   const transformedProps: AppAuthProps = props?.redirectUrls ? {
     ios: {
-      urlScheme: props.redirectUrls[0]?.split('://')[0], // Extract scheme from first URL
+      urlScheme: redirectUrlScheme,
     },
     android: {
-      appAuthRedirectScheme: props.redirectUrls[0]?.split('://')[0], // Extract scheme from first URL
+      appAuthRedirectScheme: redirectUrlScheme,
     },
     ...props,
   } : (props || {});
@@ -36,4 +42,4 @@ const withAppAuth: AppAuthConfigPlugin = (config, props) => {
   ]);
 };
 
-export default createRunOncePlugin(withAppAuth, packageJson.name, packageJson.version);
+export default createRunOncePlugin(withAppAuth, packageJson.name, packageJson.version);