@ledgerhq/hw-app-eth/lib/services/ledger/erc20.js

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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};
var __generator = (this && this.__generator) || function (thisArg, body) {
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};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
exports.__esModule = true;
exports.list = exports.byContractAddressAndChainId = exports.findERC20SignaturesInfo = void 0;
var erc20_signatures_1 = __importDefault(require("@ledgerhq/cryptoassets/data/erc20-signatures"));
var logs_1 = require("@ledgerhq/logs");
var axios_1 = __importDefault(require("axios"));
var loadConfig_1 = require("./loadConfig");
var findERC20SignaturesInfo = function (userLoadConfig) { return __awaiter(void 0, void 0, void 0, function () {
    var cryptoassetsBaseURL, url, blob;
    return __generator(this, function (_a) {
        switch (_a.label) {
            case 0:
                cryptoassetsBaseURL = (0, loadConfig_1.getLoadConfig)(userLoadConfig).cryptoassetsBaseURL;
                if (!cryptoassetsBaseURL)
                    return [2 /*return*/, null];
                url = "".concat(cryptoassetsBaseURL, "/erc20-signatures.json");
                return [4 /*yield*/, axios_1["default"]
                        .get(url)
                        .then(function (_a) {
                        var data = _a.data;
                        if (!data || typeof data !== "string") {
                            throw new Error("ERC20 signatures file is malformed ".concat(url));
                        }
                        return data;
                    })["catch"](function (e) {
                        (0, logs_1.log)("error", "could not fetch from " + url + ": " + String(e));
                        return null;
                    })];
            case 1:
                blob = _a.sent();
                return [2 /*return*/, blob];
        }
    });
}); };
exports.findERC20SignaturesInfo = findERC20SignaturesInfo;
/**
 * Retrieve the token information by a given contract address if any
 */
var byContractAddressAndChainId = function (contract, chainId, erc20SignaturesBlob) {
    // If we are able to fetch data from s3 bucket that contains dynamic CAL
    if (erc20SignaturesBlob) {
        try {
            return parse(erc20SignaturesBlob).byContractAndChainId(asContractAddress(contract), chainId);
        }
        catch (e) {
            return get().byContractAndChainId(asContractAddress(contract), chainId);
        }
    }
    // the static fallback when dynamic cal is not provided
    return get().byContractAndChainId(asContractAddress(contract), chainId);
};
exports.byContractAddressAndChainId = byContractAddressAndChainId;
/**
 * list all the ERC20 tokens informations
 */
var list = function (erc20SignaturesBlob) {
    // If we are able to fetch data from s3 bucket that contains dynamic CAL
    if (erc20SignaturesBlob) {
        try {
            return parse(erc20SignaturesBlob).list();
        }
        catch (e) {
            return get().list();
        }
    }
    // the static fallback when dynamic cal is not provided
    return get().list();
};
exports.list = list;
var asContractAddress = function (addr) {
    var a = addr.toLowerCase();
    return a.startsWith("0x") ? a : "0x" + a;
};
var parse = function (erc20SignaturesBlob) {
    var buf = Buffer.from(erc20SignaturesBlob, "base64");
    var map = {};
    var entries = [];
    var i = 0;
    while (i < buf.length) {
        var length_1 = buf.readUInt32BE(i);
        i += 4;
        var item = buf.slice(i, i + length_1);
        var j = 0;
        var tickerLength = item.readUInt8(j);
        j += 1;
        var ticker = item.slice(j, j + tickerLength).toString("ascii");
        j += tickerLength;
        var contractAddress = asContractAddress(item.slice(j, j + 20).toString("hex"));
        j += 20;
        var decimals = item.readUInt32BE(j);
        j += 4;
        var chainId = item.readUInt32BE(j);
        j += 4;
        var signature = item.slice(j);
        var entry = {
            ticker: ticker,
            contractAddress: contractAddress,
            decimals: decimals,
            chainId: chainId,
            signature: signature,
            data: item
        };
        entries.push(entry);
        map[String(chainId) + ":" + contractAddress] = entry;
        i += length_1;
    }
    var api = {
        list: function () { return entries; },
        byContractAndChainId: function (contractAddress, chainId) {
            return map[String(chainId) + ":" + contractAddress];
        }
    };
    return api;
};
// this internal get() will lazy load and cache the data from the erc20 data blob
var get = (function () {
    var cache;
    return function () {
        if (cache)
            return cache;
        var api = parse(erc20_signatures_1["default"]);
        cache = api;
        return api;
    };
})();
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