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App.js
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App.js
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import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import * as Linking from 'expo-linking';
import * as React from 'react';
import { Button, Text, TextInput, View } from 'react-native';
const AuthContext = React.createContext();
function SplashScreen() {
return (
<View>
<Text>Loading...</Text>
</View>
);
}
function HomeScreen() {
const { signOut } = React.useContext(AuthContext);
return (
<View>
<Text>Signed in!</Text>
<Button title="Sign out" onPress={signOut} />
</View>
);
}
function ProfileScreen() {
return (
<View>
<Text>Profile screen!</Text>
</View>
);
}
function SignInScreen() {
const [username, setUsername] = React.useState('');
const [password, setPassword] = React.useState('');
const { signIn } = React.useContext(AuthContext);
return (
<View>
<TextInput
placeholder="Username"
value={username}
onChangeText={setUsername}
/>
<TextInput
placeholder="Password"
value={password}
onChangeText={setPassword}
secureTextEntry
/>
<Button title="Sign in" onPress={() => signIn({ username, password })} />
</View>
);
}
const Stack = createStackNavigator();
const prefix = Linking.createURL('/');
export default function App({ navigation }) {
const linking = {
prefixes: [prefix],
config: {
screens: {
Home: "home",
Profile: "profile",
SignIn: "login"
}
}
};
const [state, dispatch] = React.useReducer(
(prevState, action) => {
switch (action.type) {
case 'RESTORE_TOKEN':
return {
...prevState,
userToken: action.token,
isLoading: false,
};
case 'SIGN_IN':
return {
...prevState,
isSignout: false,
userToken: action.token,
};
case 'SIGN_OUT':
return {
...prevState,
isSignout: true,
userToken: null,
};
}
},
{
isLoading: true,
isSignout: false,
userToken: null,
}
);
React.useEffect(() => {
// Fetch the token from storage then navigate to our appropriate place
const bootstrapAsync = async () => {
let userToken;
try {
// Restore token stored in `SecureStore` or any other encrypted storage
// userToken = await SecureStore.getItemAsync('userToken');
} catch (e) {
// Restoring token failed
}
// After restoring token, we may need to validate it in production apps
// This will switch to the App screen or Auth screen and this loading
// screen will be unmounted and thrown away.
dispatch({ type: 'RESTORE_TOKEN', token: userToken });
};
bootstrapAsync();
}, []);
const authContext = React.useMemo(
() => ({
signIn: async (data) => {
// In a production app, we need to send some data (usually username, password) to server and get a token
// We will also need to handle errors if sign in failed
// After getting token, we need to persist the token using `SecureStore` or any other encrypted storage
// In the example, we'll use a dummy token
dispatch({ type: 'SIGN_IN', token: 'dummy-auth-token' });
},
signOut: () => dispatch({ type: 'SIGN_OUT' }),
signUp: async (data) => {
// In a production app, we need to send user data to server and get a token
// We will also need to handle errors if sign up failed
// After getting token, we need to persist the token using `SecureStore` or any other encrypted storage
// In the example, we'll use a dummy token
dispatch({ type: 'SIGN_IN', token: 'dummy-auth-token' });
},
}),
[]
);
if (state.isLoading) {
<Stack.Screen name="Splash" component={SplashScreen} />
}
return (
<AuthContext.Provider value={authContext}>
<NavigationContainer linking={linking}>
<Stack.Navigator>
{state.userToken == null ? (
// No token found, user isn't signed in
<Stack.Screen
name="SignIn"
component={SignInScreen}
options={{
title: 'Sign in',
// When logging out, a pop animation feels intuitive
animationTypeForReplace: state.isSignout ? 'pop' : 'push',
}}
/>
) : (
// User is signed in
<>
<Stack.Screen name="Home" component={HomeScreen} />
<Stack.Screen name="Profile" component={ProfileScreen} />
</>
)}
</Stack.Navigator>
</NavigationContainer>
</AuthContext.Provider>
);
}