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if (window.ethereum) { window.web3 = new Web3(window.ethereum); window.ethereum.enable(); } 1 2 3 4 Similarly to Listing 4.6, the function is exported and used by leaseActions and loanActions , respectively. The API is free of charge and we were given an API key from the OpenSea team to use it. We are also providing links to the OpenSea website to encourage our users to check out and use their marketplace. 4.2.5 Web3 services To connect to the leaseNFT and lendNFT smart contracts we are using Web3.js. It is a library that facilitates the connection to the Ethereum ecosystem. [50] Listing 4.7: Basic example of Web3 connection. First, we check if the browser is Web3 compatible and if window.ethereum exists. window.ethereum is the provider object and supports the EIP-1193 standard [57] of Ethereum provider APIs. It is compatible with the native provider of Web3 that the browser of the user has. Finally, window.ethereum.enable() asks for the permission of the user to connect to his wallet. For all the smart contract calls we use the web3.eth.Contract object, specify- ing the JSON interface of each smart contract, derived from the Application Binary Interface (ABI) of the contract. We also need to specify the address where the smart contract is deployed to and the address that makes the call. In Listing 4.8 we have an example of how a contract instance for the leaseNFT smart contract can be created. const leaseNFTContract = new web3.eth.Contract(contractInterface, CONTRACT_ADDRESS, { from: address }); 1 2 3 4 Listing 4.8: Example of contract instance. In Listing 4.9, we retrieve the list of lease offers and loan requests. In the smart contract they are both public mappings, so they can be easily accessed using their key-value pairs. First we need to call the totalLeaseOffers function to return the number. The result will be used to retrieve each element of . totalLeaseOffers allLeaseOffers 1 2 export const getAllLeaseOffers = async (address) => { const totalLeaseOffers = 52PDF Image | NFT finance Leveraging Non-Fungible Tokens
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