@ledgerhq/hw-app-eth
Version:
Ledger Hardware Wallet Ethereum Application API
104 lines • 3.81 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.byContractAddressAndChainId = exports.findERC20SignaturesInfo = void 0;
const axios_1 = __importDefault(require("axios"));
const logs_1 = require("@ledgerhq/logs");
const index_1 = require("@ledgerhq/cryptoassets-evm-signatures/data/evm/index");
const loadConfig_1 = require("./loadConfig");
const asContractAddress = (addr) => {
const a = addr.toLowerCase();
return a.startsWith("0x") ? a : "0x" + a;
};
const findERC20SignaturesInfo = async (userLoadConfig, chainId) => {
const { cryptoassetsBaseURL } = (0, loadConfig_1.getLoadConfig)(userLoadConfig);
if (!cryptoassetsBaseURL)
return null;
const url = `${cryptoassetsBaseURL}/evm/${chainId}/erc20-signatures.json`;
const blob = await axios_1.default
.get(url)
.then(({ data }) => {
if (!data || typeof data !== "string") {
throw new Error(`ERC20 signatures for chainId ${chainId} file is malformed ${url}`);
}
return data;
})
.catch(e => {
(0, logs_1.log)("error", "could not fetch from " + url + ": " + String(e));
return null;
});
return blob;
};
exports.findERC20SignaturesInfo = findERC20SignaturesInfo;
/**
* Retrieve the token information by a given contract address if any
*/
const byContractAddressAndChainId = (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(chainId)?.byContractAndChainId(asContractAddress(contract), chainId);
}
}
// the static fallback when dynamic cal is not provided
return get(chainId)?.byContractAndChainId(asContractAddress(contract), chainId);
};
exports.byContractAddressAndChainId = byContractAddressAndChainId;
const parse = (erc20SignaturesBlob) => {
const buf = Buffer.from(erc20SignaturesBlob, "base64");
const map = {};
const entries = [];
let i = 0;
while (i < buf.length) {
const length = buf.readUInt32BE(i);
i += 4;
const item = buf.slice(i, i + length);
let j = 0;
const tickerLength = item.readUInt8(j);
j += 1;
const ticker = item.slice(j, j + tickerLength).toString("ascii");
j += tickerLength;
const contractAddress = asContractAddress(item.slice(j, j + 20).toString("hex"));
j += 20;
const decimals = item.readUInt32BE(j);
j += 4;
const chainId = item.readUInt32BE(j);
j += 4;
const signature = item.slice(j);
const entry = {
ticker,
contractAddress,
decimals,
chainId,
signature,
data: item,
};
entries.push(entry);
map[String(chainId) + ":" + contractAddress] = entry;
i += length;
}
return {
list: () => entries,
byContractAndChainId: (contractAddress, chainId) => map[String(chainId) + ":" + contractAddress],
};
};
// this internal get() will lazy load and cache the data from the erc20 data blob
const get = (() => {
const cache = {};
return chainId => {
if (cache[chainId])
return cache[chainId];
const signatureBlob = index_1.signatures[chainId];
if (!signatureBlob)
return null;
const api = parse(signatureBlob);
cache[chainId] = api;
return api;
};
})();
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