ethers.js/providers/infura-provider.js

var JsonRpcProvider = require('./json-rpc-provider.js');

var utils = (function() {
    return {
        defineProperty: require('ethers-utils/properties.js').defineProperty
    }
})();

function InfuraProvider(testnet, apiAccessToken) {
    if (!(this instanceof InfuraProvider)) { throw new Error('missing new'); }

    var host = (testnet ? "ropsten": "mainnet") + '.infura.io';
    var url = 'https://' + host + '/' + (apiAccessToken || '');

    JsonRpcProvider.call(this, url, testnet);

    utils.defineProperty(this, 'apiAccessToken', apiAccessToken || null);
}
JsonRpcProvider.inherits(InfuraProvider);

module.exports = InfuraProvider;