Node.js Library - picket-node

Server side library for accessing picket endpoints.

Installation

npm install "@picketapi/picket-node"

Usage - Quick Start

The Picket constructor creates a new instance of the Picket class. It takes a secret API key as a parameter.

import Picket from "@picketapi/picket-node";

// Use your secret key when making calls from secure server
const picket = new Picket("YOUR_SECRET_KEY_HERE");

We’ve placed a placeholder secret API key in this example. Replace it with your actual api keys.

Nonce

A nonce is random value generated by the Picket API to that user must sign to prove ownership a wallet address. The nonce function can be used to implement your own wallet authentication flow.

A nonce is unique to a project and wallet address. If a nonce doesn't exist for the project and wallet address, Picket will generate a new nonce; otherwise, Picket will return the existing nonce. A nonce is valid for two minutes before self-destructing.

const { nonce, statement, locale } = await picket.nonce({ 
    chain: "ethereum",
    walletAddress: "0x_WALLET_ADDRESS" 
});

Statement Localization

nonce takes in an optional locale parameter, which is used to localize the signing message statement in to the given locale . When using the login function from picket-js or picket-react , the user's browser locale will automatically be passed as the locale for the signing message statement.

Language Codes

locale must be a BCP-47 language code. To see a full list, checkout language subtag registry

const { nonce, statement, format } = await picket.nonce({ 
    chain: "ethereum",
    walletAddress: "0x_WALLET_ADDRESS",
    // translate the statement to Afrikaans
    locale: "af",
});

Auth

auth is the server-side equivalent of login. auth should only be used in a trusted server environment. The most common use-case for auth is linking a wallet to an existing application account.

Wallet Authentication

Ethereum (Mainnet)

await picket.auth({
    // optionally omit, the default chain is Ethereum
    walletAddress: "0x_WALLET_ADDRESS",
    signature: "SIGNATURE"
});

// or specifiy it explicitly
await picket.auth({
    chain: "ethereum",
    walletAddress: "0x_WALLET_ADDRESS",
    signature: "SIGNATURE"
});

Solana

Token Gating

Checkout the Getting Started Guides

For more information on Token Gating, read the Ethereum or Solana Token Gating Getting Started Guide

EVM-Compatible Chains

await picket.auth({
    // any supported EVM-compatible chain
    // if omitted, defaults to "ethereum"
    chain: "ethereum",
    walletAddress: "0x_WALLET_ADDRESS", 
    signature: "SIGNATURE",
    requirements: {
        // restrict access to token holders
        contractAddress: "0xCONTRACT_ADDRESS", 
        // omit if any number of tokens are acceptable
        minTokenBalance: 1
    }
});

Solana

Authz

Incremental Authorization (Authz)

To understand the use-cases for using authz over auth, read about Incremental Authorization

authz stands for authorization. Unlike Auth, which handles both authentication and authorization, Authz only handles authorization. Given an authenticated user's access token and authorization requirements, authz will issue a new access token on success (user is authorized) or, on failure, it will return a 4xx HTTP error code.

EVM-Compatible Chains

await picket.authz({
    // chain and wallet is stored within the access token
    accessToken: "xxx.yyy.zzz",
    requirements: {
        // check ownership of a specific contract address
        contractAddress: "0xCONTRACT_ADDRESS", 
        // omit if any number of tokens are acceptable
        minTokenBalance: 1
    }
});

Solana

Verify Token Ownership

If you only want to verify token ownership server side for a given wallet, tokenOwnership allows you to do just that.

EVM-Compatible Chains

import Picket from "@picketapi/picket-node"
const picket = new Picket('YOUR_SECRET_KEY_HERE')

const requirements = {
    // any supported EVM-compatible chain
    // if omitted, defaults to "ethereum"
    chain: "ethereum",
    walletAddress: "WALLET_ADDRESS",
    // Replace this example address with whichever contract you are verifying ownership for
    contractAddress: '0x8a90cab2b38dba80c64b7734e58ee1db38b8992e', 
    // Replace with minimum balance you want to verify users' currently hold.
    minTokenBalance: 1 
}

const { allowed, contractAddress, numTokens } = await picket.tokenOwnership(requirements)
console.log(`Allowed == ${allowed} because ${request.walletAddress} has ${numTokens} for ${contractAddress}.`)

Solana

Validate

validate validates an access token. validate should be called, or manually access token validation should be done, server-side before trusting a request's access token. It's common to move access token validation and decoding logic to a shared middleware across API endpoints.

If the access token is valid, validate returns the decoded claims of the access token.

const decoded = await picket.validate("ACCESS_TOKEN");