@urbanisierung/flethly/dist/controller/web3.controller.js

easily sell digital assets with ether

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Web3Controller = void 0;
const web3_1 = __importDefault(require("web3"));
const signedMessage_constant_1 = require("../constants/signedMessage.constant");
const network_controller_1 = require("./network.controller");
const sigUtil = require('eth-sig-util');
const web3object = 'web3';
const ethObject = 'ethereum';
class Web3Controller {
    constructor() { }
    async signMessage() {
        this.initCheck();
        const accounts = await this.web3.eth.getAccounts();
        const wallet = accounts[0];
        const blockTimestamp = await this.getBlockTimestamp();
        const signedMessage = {
            domain: signedMessage_constant_1.SIGNED_MESSAGE_DOMAIN,
            version: signedMessage_constant_1.SIGNED_MESSAGE_VERSION,
            timestamp: {
                type: 'string',
                name: 'Timestamp',
                value: `${blockTimestamp}`,
            },
            wallet: {
                type: 'string',
                name: 'Wallet',
                value: wallet,
            },
        };
        const signatureResult = await new Promise((resolve, reject) => {
            ;
            this.web3.currentProvider.sendAsync({
                method: 'eth_signTypedData',
                params: [Web3Controller.getMessageArray(signedMessage), wallet],
                wallet,
            }, (error, result) => {
                if (error) {
                    reject(error);
                }
                if (result.error) {
                    reject(result.error);
                }
                resolve(result.result);
            });
        });
        const signature = {
            message: signedMessage,
            wallet,
            signature: signatureResult,
        };
        return signature;
    }
    static verifySignature(signature) {
        const recovered = sigUtil.recoverTypedSignatureLegacy({
            data: Web3Controller.getMessageArray(signature.message),
            sig: signature.signature,
        });
        const signatureCorrect = recovered === signature.wallet.toLowerCase();
        const expired = Date.now() - Number(signature.message.timestamp.value) > signedMessage_constant_1.TTL;
        return signatureCorrect && !expired;
    }
    async generateAuthHeader(signature) {
        let verification = false;
        let sig = signature;
        if (sig) {
            try {
                verification = Web3Controller.verifySignature(signature);
            }
            catch (error) {
                //
            }
        }
        if (!verification || !sig) {
            sig = await this.signMessage();
        }
        if (!sig) {
            throw new Error(`Signature unavailable`);
        }
        return Web3Controller.encodeHeader(sig);
    }
    async getBlockTimestamp() {
        this.initCheck();
        const blockNumber = await this.web3.eth.getBlockNumber();
        const block = await this.web3.eth.getBlock(blockNumber);
        return Number(block.timestamp) * 1000;
    }
    async getNetwork() {
        this.initCheck();
        const networkId = await this.web3.eth.net.getId();
        const networkData = network_controller_1.NetworkController.getNetworkDataById(networkId);
        return networkData;
    }
    async initBrowser() {
        if (typeof window !== 'undefined') {
            if (window[ethObject]) {
                this.web3 = new web3_1.default(window[ethObject]);
                try {
                    await window[ethObject].enable();
                }
                catch (error) {
                    return false;
                }
            }
            else {
                const provider = window[web3object].currentProvider;
                if (!provider) {
                    return false;
                }
                this.web3 = new web3_1.default(provider);
            }
            return true;
        }
        return false;
    }
    initServer(httpProvider) {
        try {
            const provider = new web3_1.default.providers.HttpProvider(httpProvider);
            if (!provider) {
                return false;
            }
            this.web3 = new web3_1.default(provider);
        }
        catch (_error) {
            return false;
        }
        return true;
    }
    static getMessageArray(message) {
        return [message.domain, message.version, message.timestamp, message.wallet];
    }
    initCheck() {
        if (!this.web3) {
            throw new Error(`web3 not initialized`);
        }
    }
    static encodeHeader(signature) {
        const data = JSON.stringify(signature);
        const buffer = Buffer.from(data, 'utf-8');
        const base64 = buffer.toString('base64');
        return base64;
    }
    static decodeHeader(base64) {
        const buffer = Buffer.from(base64, 'base64');
        const decoded = buffer.toString('utf-8');
        const signature = JSON.parse(decoded);
        return signature;
    }
}
exports.Web3Controller = Web3Controller;
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