@notifi-network/notifi-frontend-client

Notifi Frontend Client

The Notifi Frontend Client SDK is a JavaScript (Typescript) library that allows you to integrate the Notifi Network into your decentralized application (dApp). Dapp will be able to access Notifi services using client methods.

@notifi/notifi-frontend-client package is not framework specific, it means you can use it with any JavaScript framework like React, Angular, Vue, svelte, etc.

Note: if you are using React, Notifi has a React SDK that is built on top of this SDK, @notifi-network/notifi-react

📥 Installation

npm i @notifi-network/notifi-frontend-client

🪝 Initialization

Instantiate the client object at your dapp to interact with the Notifi core services by providing your notifi Notifi tenant credentials and the user's wallet information.

const tenantId = '<notifi-tenent-id>'; // dappAddress
const env = 'Production'; // or 'Development'
const walletBlockchain = '<the-blockchain-of-your-choice>'; // e.g. 'Ethereum'

const client = instantiateFrontendClient({
  walletBlockchain,
  // ⬇ Users wallet credentials (public key, address, user account ... etc), properties differ depending on the blockchain (below is an example for Evm chains)
  walletPublicKey: '<user-wallet-public-key>',
  // ⬇ Notifi tenant credentials
  tenantId,
  env,
});

const newUserState = await client.initialize();

Reference:

• You can register a new tenant to get tenantId (dappAddress) at Notifi Admin Panel for free.
• The interface of input argument differs depending on the blockchain, see the type doc here

🔏 Authorization

There are two authentication categories to onboard the users with Notifi:

1. On-chain (blockchain) authorization

   • Arbitrary signature authorization
   • Transaction signature authorization

2. Off-chain (OpenID Connect) authorization

On-chain method: Arbitrary signature authorization

Authorize users using logIn client method by providing a signMessage callback function.

const signMessage: AptosSignMessageFunction = async (message, nonce) => {
  // Implement your signing logic here ...

  return signature; // string (if the signature is not string format, you will need to convert it to string)
};

const loginResult = await client.logIn({
  walletBlockchain: `the-blockchain-of-your-choice`,
  signMessage,
});

NOTE:

• The format of the returned signature differs depending on the blockchain, see the type doc here
• The example of implementing signMessage callback function: notifi-svelte-example
• Notifi supported blockchains: WalletBlockchain Enum documentation

On-chain method: Transaction signature authorization

Authorize users by using beginLoginViaTransaction method and completeLoginViaTransaction client method. The beginLoginViaTransaction method will return a nonce that should be appended to the transaction data before signing the transaction. The completeLoginViaTransaction method will take the transaction signature and the nonce to complete the login process. The following examples show how to authorize a user using the transaction signature method on EVM (Ethereum virtual machine) compatible blockchains.

const smartContract = new ethers.Contract(
  `<contract-address>`,
  `<contract-abi>`,
  provider.getSigner(),
);

// Assume the smart contract has an "example" method with one argument uint amount
const amount = ethers.utils.parseUnits('0.1', 'ether');

// Step 1: Get the calldata for the smart contract method call
const calldata = smartContract.interface.encodeFunctionData('example', [
  amount,
]);

// Step 2: Get notifi nonce
const { nonce } = await notifiClient.beginLoginViaTransaction({
  walletBlockchain,
  walletAddress,
});
console.info({ notifiNonce: nonce }); // notifiNonce will be a 32 bytes hex string

// Step 3: Append notifi nonce to the calldata
const txParams = {
  to: smartContract.address,
  data: calldata + nonce.replace('0x', ''),
};

// Step 4: Sign the transaction with new calldata
const { hash } = await provider.getSigner().sendTransaction(txParams);

// Step 5: Use the transaction signature to login to notifi
const notifiLoginResult = await notifiClient.completeLoginViaTransaction({
  walletAddress,
  walletAddress,
  transactionSignature: hash,
  walletBlockchain,
});

IMPORTANT NOTE:

• Browser extension constraints: Some browser extensions (Metamask ...) do not allow appending additional info to the calldata of particular smart contract method (example: Token contract (ERC20, ERC721 ...etc)). Browser extension (Metamask) will throw Message: Invalid token value; should be exactly xx hex digits long error in this case.

Off-chain method: OpenID Connect (OIDC) Authorization

Authorize users by using logIn client method by providing a signIn callback function.

const signIn: OidcSignInFunction = async () => {
  // other logic here to generate the OIDC token id (JWT token)
  const jwt = '<the-oidc-id-token-here>';
  return {
    oidcProvider: 'GOOGLE',
    jwt,
  };
};

const loginResult = await client.logIn({
  walletBlockchain: 'OFF_CHAIN',
  signIn,
});

NOTE

• Respective OIDC login arguments
• Notifi supported OIDC providers: OidcProvider Enum document
• To enable OIDC login, it requires additional setup to integrate your OIDC provider with Notifi tenant using Notifi Admin Portal check on the Notifi Documentation (WIP: coming soon)

Fetch User Data

The fetchFusionData client method is used to fetch the user's data, including their:

1. targetGroup: contact informations
2. alerts: subscribed alerts

NOTE:

• interface

📭 Destinations

The ensureTargetGroup client method is used to create a target group for the user's contact information.

Notifi supports the following destination types:

• Email
• SMS
• Telegram
• Discord
• More to come

const targetGroup = client.ensureTargetGroup({
  name: 'Default',
  emailAddress: '<user-email>',
  // ... other destination types if needed
});

Reference: ensureTargetGroup

🪢 Topics & Alerts

There are two key concepts of Notifi's notification source: Alert and Topic.

• Topic is the event allowed to be subscribed (Tenant specific).
• Alert is the subscription of the Topic (User specific).

Topic is the prototype of the Alert.

Topics

We can get the available topics of the tenant by calling fetchTenantConfig client method.

const id = '<ui-card-config-of-the-tenant>';
const tenantConfig = await client.fetchTenantConfig({
  id,
  type: 'SUBSCRIPTION_CARD',
});
const topics = tenantConfig.fusionEventTopics;

NOTE:

• interface
• You can config your card in the Notifi Admin Panel

Alerts

We can subscribe users to a topic by creating an alert object by using the ensureFusionAlerts client method.

The following methods are used to get and delete alerts:

• getAlerts
• deleteAlert

The full example of getting, deleting, and creating an alert is shown below:

import { resolveObjectArrayRef } from '@notifi-network/notifi-frontend-client';

const topic = topics[0];
const fusionEventDescriptor = topic.fusionEventDescriptor;
const fusionEventMetadataJson = fusionEventDescriptor.metadata;
const fusionEventId = fusionEventDescriptor.id;

if (fusionEventMetadataJson && fusionEventId) {
  const fusionEventMetadata = getFusionEventMetadata(topic);
  const filters = fusionEventMetadata?.filters?.filter(isAlertFilter);
  const fusionFilterOptionsInput: FusionFilterOptions['input'] = {};
  if (filters && filters.length > 0) {
    // NOTE: for now we only consider 1 to 1 relationship (1 filter for 1 topic)
    const userInputParams = filters[0].userInputParams;
    const userInputOptions: UserInputOptions = {};
    userInputParams.forEach((userInputParm) => {
      userInputOptions[userInputParm.name] = userInputParm.defaultValue;
    });
    fusionFilterOptionsInput[filters[0].name] = userInputOptions;
  }
  const filterOptions: FusionFilterOptions = {
    version: 1,
    input: fusionFilterOptionsInput,
  };
  /** Error caught here often caused by incorrect `inputs` format  */
  const subscriptionValueOrRef =
    fusionEventMetadata?.uiConfigOverride?.subscriptionValueOrRef;
  const subscriptionValue = subscriptionValueOrRef
    ? resolveObjectArrayRef('', subscriptionValueOrRef, inputs) // See the related information section for more details
    : null;

  const alertToCreate = fusionEventId;
  const createAlertInputs = [
    {
      fusionEventId: fusionEventId,
      name: alertToCreate,
      targetGroupId,
      subscriptionValue: subscriptionValue?.[0]?.value,
      filterOptions: JSON.stringify(filterOptions),
    },
  ];
}
const existingAlerts = await getAlerts()) ?? [];
const existingAlertNames = alerts.map((alert) => alert.name);

// Alerts are immutable, delete the existing instead
if (existingAlertNames.includes(alerToCreate)) {
  const id = existingAlerts[alerToCreate].id;
  await client.deleteAlert({ id });
}

// Create the alert
await frontendClient.ensureFusionAlerts({ alerts: createAlertInputs });

// Utils
const getFusionEventMetadata = (
  topic: FusionEventTopic,
): FusionEventMetadata | null => {
  const parsedMetadata = JSON.parse(
    topic.fusionEventDescriptor.metadata ?? '{}',
  );
  if (isFusionEventMetadata(parsedMetadata)) {
    return parsedMetadata;
  }
  return null;
};

const isFusionEventMetadata = (
  metadata: unknown,
): metadata is FusionEventMetadata => {
  const metadataToVerify = metadata as any;
  if (typeof metadataToVerify !== 'object' || !metadataToVerify) {
    return false;
  }
  return (
    'filters' in metadataToVerify && Array.isArray(metadataToVerify.filters)
  );
};

Related Information:

• inputs: it is a concept which is used when a dynamic topic subscription value needs to be adopted. The input is a key-value pair object. The key is the value associated with the Create a new topic section in Admin Portal. The value is the dynamic value that needs to be passed into the topic subscription. The value needs to be an array of InputObject interface. See the doc here

🔔 Notification History

To get notification history, use the getFusionNotificationHistory()

const { nodes, pageInfo } = await client.getFusionNotificationHistory({
  first,
  after,
});

const notifications = nodes.map((node) => {
  return {
    icon: node.detail.icon,
    topicName: node.detail.sourceName,
    message: node.detail.message,
    timestamp: node.createdDate,
  };
});

⚠️ Listening to events

Using addEventListener method allows to monitor the stateChanged event.

Listening to event

const id = client.addEventListener('stateChanged', eventHandler, errorHandler);

const eventHandler = (event) => {
  if (event.__typename === 'TargetStateChangedEvent') {
    console.info('User target state changed', event);
  }
  if (event.__typename === 'NotificationHistoryStateChangedEvent') {
    console.info('New notification coming', event);
  }
};

const errorHandler = (error: Error) => {
  console.error('Error occurred', error);
};

Removing the event listener

client.removeEventListener('stateChanged', id);

Contributing & Testing

We welcome and appreciate your contributions! Please review our contribution guidelines before getting started.

To ensure a smooth contribution process, please run npm run test below to confirm that all tests pass before submitting your changes

If your contribution includes a new feature, you may also want to create a dedicated test case within the __tests__/NotifiFrontendClient.test.ts file to validate its functionality.

📝 More examples

• notifi-dapp-example: A dapp example built with @notifi/notifi-frontend-client and @notifi/notifi-react SDKs.

• notifi-react-example-v2: React contexts & components library built with @notifi/notifi-frontend-client.