react-native-gizwits-google-signin

!React Native Google Sign In

Features

- Support all 3 types of authentication methods (standard, with server-side validation or with offline access (aka server side access))
- Promise-based API consistent between Android and iOS
- Typings for TypeScript and Flow
- Native signin buttons

Project setup and initialization

yarn add react-native-google-signin

Then follow the Android guide and iOS guide

Public API

$3

!signin button

``js
import { GoogleSignin, GoogleSigninButton } from 'react-native-google-signin';

render() {
style={{ width: 192, height: 48 }}
size={GoogleSigninButton.Size.Wide}
color={GoogleSigninButton.Color.Dark}
onPress={this._signIn}
disabled={this.state.isSigninInProgress} />
}
`

#### Props

##### size

Possible values:

- Size.Icon: display only Google icon. Recommended size of 48 x 48.
- Size.Standard: icon with 'Sign in'. Recommended size of 230 x 48.
- Size.Wide: icon with 'Sign in with Google'. Recommended size of 312 x 48.

##### color

Possible values:

- Color.Dark: apply a blue background
- Color.Light: apply a light gray background

##### disabled

Boolean. If true, all interactions for the button are disabled.

##### onPress

Handler to be called when the user taps the button

##### Inherited View props...

$3

`js
import { GoogleSignin, GoogleSigninButton, statusCodes } from 'react-native-google-signin';
`

#### configure(options)

It is mandatory to call this method before attempting to call signIn() and signInSilently(). This method is sync meaning you can call signIn / signInSilently right after it. In typical scenarios, configure needs to be called only once, after your app starts. In the native layer, this is a synchronous call.

Example usage with for default options: you get user email and basic profile info.

`js
import { GoogleSignin } from 'react-native-google-signin';

GoogleSignin.configure();
`

Example to access Google Drive both from the mobile application and from the backend server

`js
GoogleSignin.configure({
scopes: ['https://www.googleapis.com/auth/drive.readonly'], // what API you want to access on behalf of the user, default is email and profile
webClientId: '', // client ID of type WEB for your server (needed to verify user ID and offline access)
offlineAccess: true, // if you want to access Google API on behalf of the user FROM YOUR SERVER
hostedDomain: '', // specifies a hosted domain restriction
loginHint: '', // [iOS] The user's ID, or email address, to be prefilled in the authentication UI if possible. See docs here
forceConsentPrompt: true, // [Android] if you want to show the authorization prompt at each login.
accountName: '', // [Android] specifies an account name on the device that should be used
iosClientId: '', // [iOS] optional, if you want to specify the client ID of type iOS (otherwise, it is taken from GoogleService-Info.plist)
});
`

#### signIn()

Prompts a modal to let the user sign in into your application. Resolved promise returns an userInfo object.

`js
// import statusCodes along with GoogleSignin
import { GoogleSignin, statusCodes } from 'react-native-google-signin';

// Somewhere in your code
signIn = async () => {
try {
await GoogleSignin.hasPlayServices();
const userInfo = await GoogleSignin.signIn();
this.setState({ userInfo });
} catch (error) {
if (error.code === statusCodes.SIGN_IN_CANCELLED) {
// user cancelled the login flow
} else if (error.code === statusCodes.IN_PROGRESS) {
// operation (f.e. sign in) is in progress already
} else if (error.code === statusCodes.PLAY_SERVICES_NOT_AVAILABLE) {
// play services not available or outdated
} else {
// some other error happened
}
}
};
`

#### signInSilently()

May be called eg. in the componentDidMount of your main component. This method returns the current user and rejects with an error otherwise.

To see how to handle errors read signIn() method

`js
getCurrentUserInfo = async () => {
try {
const userInfo = await GoogleSignin.signInSilently();
this.setState({ userInfo });
} catch (error) {
if (error.code === statusCodes.SIGN_IN_REQUIRED) {
// user has not signed in yet
} else {
// some other error
}
}
};
`

#### isSignedIn()

This method may be used to find out whether some user is currently signed in. It returns a promise which resolves with a boolean value (it never rejects). In the native layer, this is a synchronous call. This means that it will resolve even when the device is offline. Note that it may happen that isSignedIn() resolves to true and calling signInSilently() rejects with an error (eg. due to a network issue).

`js
isSignedIn = async () => {
const isSignedIn = await GoogleSignin.isSignedIn();
this.setState({ isLoginScreenPresented: !isSignedIn });
};
`

#### getCurrentUser()

This method resolves with null or userInfo object. The call never rejects and in the native layer, this is a synchronous call. Note that on Android, accessToken is always null in the response.

`js
getCurrentUser = async () => {
const currentUser = await GoogleSignin.getCurrentUser();
this.setState({ currentUser });
};
`

#### clearCachedToken(tokenString)

This method only has an effect on Android (Calling this method always resolves on iOS.). You may run into a 401 Unauthorized error when a token is invalid. Call this method to remove the token from local cache and then call getTokens() to get fresh tokens.

#### getTokens()

Resolves with an object containing { idToken: string, accessToken: string, } or rejects with an error. Note that using accessToken is discouraged.

#### signOut()

Remove user session from the device.

`js
signOut = async () => {
try {
await GoogleSignin.revokeAccess();
await GoogleSignin.signOut();
this.setState({ user: null }); // Remember to remove the user from your app's state as well
} catch (error) {
console.error(error);
}
};
`

#### revokeAccess()

Remove your application from the user authorized applications.

`js
revokeAccess = async () => {
try {
await GoogleSignin.revokeAccess();
console.log('deleted');
} catch (error) {
console.error(error);
}
};
`

#### hasPlayServices(options)

Check if device has Google Play Services installed. Always resolves to true on iOS.

Presence of up-to-date Google Play Services is required to show the sign in modal, but it is _not_ required to perform calls to configure and signInSilently. Therefore, we recommend to call hasPlayServices directly before signIn.

`js
try {
await GoogleSignin.hasPlayServices({ showPlayServicesUpdateDialog: true });
// google services are available
} catch (err) {
console.error('play services are not available');
}
`

hasPlayServices accepts one parameter, an object which contains a single key: showPlayServicesUpdateDialog (defaults to true). When showPlayServicesUpdateDialog is set to true the library will prompt the user to take action to solve the issue, as seen in the figure below.

You may also use this call at any time to find out if Google Play Services are available and react to the result as necessary.

![prompt install](#prompt-install)

#### statusCodes

These are useful when determining which kind of error has occured during sign in process. Import statusCodes along with GoogleSignIn. Under the hood these constants are derived from native GoogleSignIn error codes and are platform specific. Always prefer to compare error.code to statusCodes.SIGN_IN_CANCELLED or statusCodes.IN_PROGRESS and not relying on raw value of the error.code.

| Name | Description |
| ----------------------------- | ------------------------------------------------------------------------------------------------------------- |
| SIGN_IN_CANCELLED | When user cancels the sign in flow |
| IN_PROGRESS | Trying to invoke another sign in flow (or any of the other operations) when previous one has not yet finished |
| SIGN_IN_REQUIRED | Useful for use with signInSilently() - no user has signed in yet |
| PLAY_SERVICES_NOT_AVAILABLE | Play services are not available or outdated, this can only happen on Android |

Example how to use statusCodes.

$3

Example userInfo which is returned after successful sign in.

`
{
idToken: string,
serverAuthCode: string,
scopes: Array, // on iOS this is empty array if no additional scopes are defined
user: {
email: string,
id: string,
givenName: string,
familyName: string,
photo: string, // url
name: string // full name
}
}
`

Want to contribute?

Check out the contributor guide!

Notes

Calling the methods exposed by this package may involve remote network calls and you should thus take into account that such calls may take a long time to complete (eg. in case of poor network connection).

idToken Note: idToken is not null only if you specify a valid webClientId. webClientId corresponds to your server clientID on the developers console. It HAS TO BE of type WEB

Read iOS documentation and Android documentation for more information

serverAuthCode Note: serverAuthCode is not null only if you specify a valid webClientId and set offlineAccess to true. once you get the auth code, you can send it to your backend server and exchange the code for an access token. Only with this freshly acquired token can you access user data.

Read iOS documentation and Android documentation for more information.

Additional scopes

The default requested scopes are email and profile.

If you want to manage other data from your application (for example access user agenda or upload a file to drive) you need to request additional permissions. This can be accomplished by adding the necessary scopes when configuring the GoogleSignin instance.

Please visit https://developers.google.com/identity/protocols/googlescopes or https://developers.google.com/oauthplayground/ for a list of available scopes.

Troubleshooting

If you get a SIGN_IN_REQUIRED error code on Android from signIn(), make sure you've correctly setup the Google project including the SHA-1 of your debug and release keystores, and copied the new google-services.json` in your project.

Licence

(MIT)