React Native Otp Verify ✉️

___

- Automatic SMS Verification with the SMS Retriever API (Android Only)
- Phone Number Retrieving using the Phone Number Hint API (Android Only)

Automatic SMS Verification with the SMS Retriever API, you can perform SMS-based user verification in your Android app automatically, without requiring the user to manually type verification codes, and without requiring any extra app permissions.

Message Format/Structure

In order to detect the message, _SMS message must include a hash_ that identifies your app. This hash can be obtained by using the getHash() method below.

Please read the official documentation for the message structure at this
Google developer guide

Quick start 🔥

#### Installation
$ npm install react-native-otp-verify --save

or

$ yarn add react-native-otp-verify

Usage

#### Import the Library
``javascript
import {
getHash,
startOtpListener,
useOtpVerify,
} from 'react-native-otp-verify';
`

#### Using Hook
`javascript

// You can use the startListener and stopListener to manually trigger listeners again.
// optionally pass numberOfDigits if you want to extract otp
const { hash, otp, message, timeoutError, stopListener, startListener } = useOtpVerify({numberOfDigits: 4});
`
#### Properties
| Property | Type | Description |
| ------------- |:-------------:|:-------------:|
| hash | string[] | The hash code for the application which should be added at the end of message.|
| otp | string | OTP retreived from SMS when received. (Must pass numberOfDigits) |
| message | string | SMS message when received. |
| timeoutError | boolean | Flag is set to true when after timeout (5 minutes) Check here |
| startListener | function | Manually starts listener again in case of timeout or any other error |
| stopListener | function | Stops listener for the sms |

#### Using Methods
`javascript
// using methods
useEffect(() => {
getHash().then(hash => {
// use this hash in the message.
}).catch(console.log);

startOtpListener(message => {
// extract the otp using regex e.g. the below regex extracts 4 digit otp from message
const otp = /(\d{4})/g.exec(message)[1];
setOtp(otp);
});
return () => removeListener();
}, []);
`


Example


See the example app in example folder.

$3

Linking the package manually is not required anymore with Autolinking.

$3

1. Open up android/app/src/main/java/[...]/MainActivity.java
- Add import com.faizal.OtpVerify.OtpVerifyPackage; to the imports at the top of the file
- Add new OtpVerifyPackage() to the list returned by the getPackages() method
2. Append the following lines to android/settings.gradle:
`gradle
include ':react-native-otp-verify'
project(':react-native-otp-verify').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-otp-verify/android')
`
3. Insert the following lines inside the dependencies block in android/app/build.gradle:
`gradle
implementation project(':react-native-otp-verify')
`

#### Methods
---
#### requestHint: () => Promise

Gets phone number in a frictionless way to show a user’s (SIM-based) phone numbers as a hint. Check here

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#### startOtpListener(handler:(message:string)=>any):Promise

Start listening for OTP/SMS and adds listener for the handler passed which is called when message is received..

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#### getOtp():Promise

Start listening for OTP/SMS. Return true if listener starts else throws error.

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#### getHash():Promise

Gets the hash code for the application which should be added at the end of message.
This is just a one time process.

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#### addListener(handler:(message:string)=>any):Subscription

Adds a javascript listener to the handler passed which is called when message is received.

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#### removeListener():void`

Removes all listeners.

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