Authentication

Authenticating with the LearnCard Network API

To interact with the LearnCard Network API, you can choose one of two ways to authenticate:

1. Using the LearnCard Network Plugin (@learncard/network-plugin) which handles authentication for you. (Preferred option)

2. Using a scoped API Token for authentication with API endpoints. (recommended for implementations using REST endpoints).

3. Directly through the API endpoints using challenge-based DID Authentication. (most complex)

1. Using LearnCard Network Plugin

To authenticate using the LearnCard Network Plugin (@learncard/network-plugin), first install the package:

pnpm install @learncard/network-plugin

Then, either instantiate a LearnCard Network enabled LearnCard, or add the Network Plugin to an existing LearnCard:

Direct Instantiation

import { initLearnCard } from '@learncard/init';
import didkit from '@learncard/didkit-plugin/dist/didkit/didkit_wasm_bg.wasm?url';

const networkLearnCard = await initLearnCard({
    seed,
    network: true,
    didkit,
});

Add Plugin

import { initLearnCard } from '@learncard/core'
import { getLearnCardNetworkPlugin } from '@learncard/network-plugin';
import didkit from '@learncard/core/dist/didkit/didkit_wasm_bg.wasm?url';

const lcnAPI = 'https://network.learncard.app/trpc';

const learnCard = await initLearnCard({
    seed,
    didkit,
});

const networkLearnCard learnCard.addPlugin(
    await getLearnCardNetworkPlugin(learnCard, lcnAPI)
);

When using the LearnCard Network Plugin, challenge-based DID Authentication is handled for you, so no further steps are necessary.

2. Using a scoped API Token

// Step 1: Create an AuthGrant with specific permissions
const grantId = await learnCard.invoke.addAuthGrant({
    name: "Boost Sender Auth",
    description: "Permission to send boosts",
    scope: 'boosts:write',
});

// Step 2: Generate an API token from the AuthGrant
const token = await learnCard.invoke.getAPITokenForAuthGrant(grantId);

// Step 3: Prepare the payload for your API request
const payload = {
    boostUri: "uri-of-the-boost-to-send",
    signingAuthority: "your-signing-authority"
};

// Step 4: Make an authenticated HTTP request using the token
const response = await fetch(
    `https://api.learncard.network/api/boost/send/via-signing-authority/RECIPIENT_PROFILE_ID`,
    {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Authorization': `Bearer ${token}`,
        },
        body: JSON.stringify(payload),
    }
);

// Step 5: Process the response
if (response.status === 200) {
    const sentBoostUri = await response.json();
    console.log(`Boost sent successfully: ${sentBoostUri}`);
} else {
    console.error(`Error sending boost: ${response.status}`);
    const errorDetails = await response.json();
    console.error(errorDetails);
}

3. Using Challenge-based DID Authentication

Profile management uses DID-based authentication with a challenge-response mechanism and scope-based authorization.

Simple High-Level Auth Flow:

Granular Auth Flow:

If you choose to use the API endpoints directly, you'll need to manage challenge-based DID Authentication for each request. Here's a simplified TypeScript example to help you implement this authentication method:

 
async function getClient(
  url = 'https://network.learncard.com/api': string,
  didAuthFunction: (challenge?: string) => Promise<string>
) {
  let challenges: string[] = [];

  const getChallenges = async (amount = 95 + Math.round((Math.random() - 0.5) * 5)): Promise<string[]> => {
    // Call the API to get a list of challenges
    // Replace this line with your preferred way of making API calls
    const response = await fetch(url + "/challenges?amount=" + amount);
    return await response.json();
  };

  challenges = await getChallenges();

  async function getAuthHeaders() {
    if (challenges.length === 0) challenges.push(...(await getChallenges()));
    return { Authorization: `Bearer ${await didAuthFunction(challenges.pop())}` };
  }

  // Use getAuthHeaders in your API calls to set the Authorization header
}

export default getClient;

In this example, we first define a getClient function that takes a url and a didAuthFunction. The didAuthFunction should be an asynchronous function that returns a signed challenge as a string.

The getChallenges function fetches a list of challenges from the API. The getAuthHeaders function generates an Authorization header using the didAuthFunction and a challenge. This header can then be used in your API calls.

Authorization & Scopes

Route Middleware

The system uses several middleware layers for authentication and authorization:

1. openRoute: Base middleware that allows public access

2. didRoute: Requires a valid DID in the request

3. didAndChallengeRoute: Requires a valid DID and challenge

4. profileRoute: Requires a valid DID, challenge, and existing profile

5. scopedRoute: Requires specific permission scopes

Authorization Scopes

Each API endpoint requires specific scopes for authorization:

Scope	Description	Example Endpoints
profiles:read	Read profile information	getProfile, getOtherProfile
profiles:write	Create or update profiles	createProfile, updateProfile
profiles:delete	Delete profiles	deleteProfile
connections:read	View connections	paginatedConnections
connections:write	Manage connections	connectWith, blockProfile
signingAuthorities:read	View signing authorities	signingAuthorities
signingAuthorities:write	Manage signing authorities	registerSigningAuthority

The authorization system also supports wildcard scopes like *:read (read access to all resources) and *:* (full access).