react-native-app-data-sharing

---

This React Native package facilitates seamless and secure data sharing between applications on the same device. It leverages SharedPreferences on Android and Keychain on iOS to ensure efficient and protected data transfer. This makes it an excellent solution for cross-app communication and integration, enabling smooth interaction and synchronization of data across multiple apps.

Quick Access

Installation | Usage and Examples | Methods | Example Code | License

Getting Started

Here's how to get started with react-native-app-data-sharing in your React Native project:

Installation

Install the package

npm install react-native-app-data-sharing

Using Yarn:

yarn add react-native-app-data-sharing

Install pod for iOS

npx pod-install

Setting up for CLI

Android

1. Set Permissions in AndroidManifest.xml

   Add the following permission to your app's AndroidManifest.xml file:

   <!-- Instruction: define app-specific permission -->
   <permission
     android:name="${applicationId}.permission.READ_SHARED_PREFS"
     android:protectionLevel="normal" />

   This permission allows other apps to access shared data when they define the same permission in their AndroidManifest.xml.

   Note: Keep ${applicationId} as-is. It will automatically resolve to your app's bundle ID.

2. Configure the Provider in AndroidManifest.xml

   Define a provider in your AndroidManifest.xml file:

   <!-- Instruction: define app-specific provider -->
   <provider
     android:name="com.data.SharedPreferencesProvider"
     android:authorities="${applicationId}.sharedpreferencesprovider"
     android:permission="${applicationId}.permission.READ_SHARED_PREFS"
     android:enabled="true"
     android:exported="true" />

   This provider facilitates data sharing between apps via the defined provider authority.

   Note: Keep ${applicationId} as-is. It will automatically resolve to your app's bundle ID.

3. Declare Permissions for External Apps

   If your app needs to access data from another app, add its permissions to your AndroidManifest.xml file:

   <!-- Instruction: Declare permission for another app -->
   <uses-permission android:name="${YOUR_APPLICATION_ID/BUNDLE_ID}.permission.READ_SHARED_PREFS" tools:ignore="CustomPermissionTypo" />

   Replace ${YOUR_APPLICATION_ID/BUNDLE_ID} with the bundle ID of the target app. For example:

   <!-- Instruction: Declare permission for other app -->
   <uses-permission android:name="com.example.one.permission.READ_SHARED_PREFS" tools:ignore="CustomPermissionTypo" />

4. Add Queries for Android 11

   Android 11 introduces package visibility restrictions, so you must explicitly define the apps your app intends to query. Add the following inside the

   <queries> section of your AndroidManifest.xml:

     <queries>
       <!-- Instruction: define package of app for Android 11 -->
       <package android:name="${applicationId}" />
       <package android:name="com.example.one" />
     </queries>

   This ensures your app can detect and interact with the specified apps.

⚠️ Note: Recommended to use this package with Android 11 or higher. ⚠️

iOS

1. Enable Capabilities

   Enable the following capabilities for your app:

   • App Groups
   • Keychain Sharing

2. Create an App Group ID

   Create an App Group ID via the Developer Console or Xcode. Ensure that both the main app and any extensions share the same App Group and Keychain Sharing group names.

   Note: Always prepend your App Group ID with $(TeamIdentifierPrefix).

For detailed instructions, refer to: App Groups Documentation Keychain Sharing Documentation

Setting up via Expo Plugin

Android

• After installing the package, configure your app.json or app.config.js as follows:

{
"name": "my app",
"plugins": [
  [
    "react-native-app-data-sharing",
    {
      "appsBundleIds": [
        YOUR_BUNDLE_IDS
      ]
    }
  ]
]
}

Replace YOUR_BUNDLE_IDS with the same bundle IDs you used when initializing the store. This ensures the required permissions are added to AndroidManifest.xml.

iOS

• Update your configuration as follows:

{
"name": "my app",
"ios": {
  "bundleIdentifier": YOUR_BUNDLE_ID,
  "entitlements": {
    "com.apple.security.application-groups": [
      APP_GROUP_ID
    ],
    "keychain-access-groups": [
      $(TeamIdentifierPrefix).APP_GROUP_ID
    ]
  }
}
}

• Replace YOUR_BUNDLE_ID and APP_GROUP_ID with your app's bundle ID and App Group ID, respectively.

Usage

Initialize Store

To enable data sharing between two apps, initialize the store as follows:

initializeStore({
  android: {
    appsBundleIds: ['data.example.two'], // Replace with your app's bundle IDs
  },
  ios: {
    accessGroup: appGroupIdentifier, // App Group identifier
    serviceName: serviceName, // Service name
  },
});

Android:

• appsBundleIds: Provide an array of the bundle IDs for the apps you want to share data with. For example: ["data.example.two"].

iOS:

• accessGroup: Specify the App Group identifier shared across apps.
• serviceName: Set the service name used for Keychain Sharing.

This setup ensures seamless data sharing between the configured apps on both Android and iOS platforms.

import React from 'react';
import { StyleSheet, View } from 'react-native';
import { saveData, initializeStore, getAllSyncData } from 'react-native-app-data-sharing';

const appGroupIdentifier = YOUR_GROUP_IDENTIFIER_WITH_TEAM_ID;
const serviceName = YOUR_GROUP_IDENTIFIER;

const App: React.FC = () => {
  useEffect(() => {
    initializeStore({
      android: {
        appsBundleIds: //Your app bundle ids i.e. ["data.example.two"]
      },
      ios: {
        accessGroup: appGroupIdentifier, // App Group identifier
        serviceName: serviceName,
      },
    });
  }, []);

  return (
    <View style={styles.container}>
      <Text>Data-Sharing</Text>
      <Button
        title="Save Data"
        onPress={async () => {
          const newValue = await saveData("email", "[email protected]");
          console.log(newValue);
        }}
      />
      <Button
        title="Get All Data"
        onPress={async () => {
          const data = await getAllSyncData();
          console.log(data);
        }}
      />
    </View>
  );
};

export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    backgroundColor: '#fff',
    alignItems: 'center',
  }
});

Types

DataOptionsType

{
  android?: {
    dataSync?: boolean;
  };
  ios?: string | SetOptions | GetOptions;
}

• dataSync: (Optional) A boolean value that indicates whether to synchronize data across apps. If set to true, the data will be synchronized with other apps that share the same authority.
• ios: (Optional) A string or an object that specifies the access control options for iOS Keychain data. It can be a string representing the access control level or an object with specific options.

---

InitialProviderType

{
  android?: {
    appsBundleIds: Array<string>;
  };
  ios?: {
    accessGroup?: string;
    serviceName?: string;
  };
}

The InitialProviderType defines platform-specific configurations for data sharing.

Android:

• appsBundleIds: Specifies the bundle IDs of other apps that can share data with the current app using SharedPreferences.

iOS:

• accessGroup: (Optional) Specifies an access group for securely sharing Keychain data across multiple apps.
• serviceName: (Optional) Sets a custom service name for Keychain storage.

Methods

initializeStore(authorities: InitialProviderType)

initializeStore(authorities: InitialProviderType): Promise<boolean>;

The initializeStore method initializes the shared data store with platform-specific configurations provided in authorities.

Parameters:

• authorities: An object adhering to InitialProviderType that defines platform-specific settings for data sharing.

Returns:

• A Promise that resolves to true if the initialization is successful, or false otherwise.

---

saveData(key, value, options)

saveData(key: string, value: string, options?: DataOptionsType): void

Description: The saveData method stores new data in the shared storage mechanism.

• Android: Saves data using SharedPreferences.
• iOS: Stores data securely in the Keychain.

Parameters:

• key (string): The unique identifier for the data to store.
• value (string): The data to be stored.
• options (optional, DataOptionsType): Platform-specific options for data storage, such as access control.

Return Type:

• void: This method does not return a value.

---

updateData(key, value, options)

updateData(key: string, value: string, options?: DataOptionsType): void

Description: The updateData method updates or stores data in the shared storage mechanism.

• Android: Uses SharedPreferences to store data.
• iOS: Utilizes Keychain for secure data storage.

Parameters:

• key (string): The unique identifier for the data to update or store.
• value (string): The new value to be stored.
• options (optional, DataOptionsType): Platform-specific options for updating data.

Return Type:

• void: This method does not return a value.

---

getData(key, options)

getData(key: string, options?: DataOptionsType): Promise<string | null>

Description: The getData method retrieves the stored value associated with the given key.

• Android: Reads data from SharedPreferences.
• iOS: Fetches data securely from the Keychain.

Parameters:

• key (string): The unique identifier for the data to retrieve.
• options (optional, DataOptionsType): Platform-specific options for retrieving data.

Return Type:

• Promise<string | null>: A promise that resolves with the stored value as a string, or null if the key does not exist.

---

getAllSyncData(options)

getAllSyncData(options?: DataOptionsType): Promise<Record<string, string>>

Description: The getAllSyncData method retrieves all stored key-value pairs.

• Android: Retrieves all data from SharedPreferences.
• iOS: Fetches all securely stored data from the Keychain.

Parameters:

• options (optional, DataOptionsType): Platform-specific options for retrieving all data.

Return Type:

• Promise<Record<string, string>>: A promise that resolves with an object containing all stored key-value pairs.

---

deleteData(key, options)

deleteData(key: string, options?: DataOptionsType): Promise<void>

Description: The deleteData method removes a specific key-value pair from the shared storage.

• Android: Deletes the key from SharedPreferences.
• iOS: Removes the key securely from the Keychain.

Parameters:

• key (string): The unique identifier for the data to delete.
• options (optional, DataOptionsType): Platform-specific options for the data to delete.

Return Type:

• Promise: A promise that resolves when the data is successfully deleted.

---

clearData(options)

clearData(options?: DataOptionsType): Promise<void>

Description: The clearData method removes all data from the shared storage.

• Android: Deletes all data from SharedPreferences.
• iOS: Wipes all data from the Keychain.

Parameters:

• options (optional, DataOptionsType): Platform-specific options for clear all data.

Return Type:

• Promise: A promise that resolves when all data is successfully cleared.

Acknowledgements

This library uses and modifies the iOS implementation from react-native-keychain for custom internal needs.

Examples

To better understand how to use these methods in a real-world scenario, refer to the following full working example projects:

ExampleAppOne: Shows the implementation in the first application to share data with the second.

ExampleAppTwo: Shows the implementation in the second application to get data with the first.

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Bugs / Feature requests / Feedbacks

For bugs, feature requests, and discussion please use GitHub Issues, GitHub New Feature, GitHub Feedback

🤝 How to Contribute

We'd love to have you improve this library or fix a problem 💪 Check out our Contributing Guide for ideas on contributing.

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License

• MIT License