@ledgerhq/hw-app-eth
Version:
Ledger Hardware Wallet Ethereum Application API
132 lines • 4.58 kB
JavaScript
import { BigNumber } from "bignumber.js";
import { ERC20_CLEAR_SIGNED_SELECTORS, ERC721_CLEAR_SIGNED_SELECTORS, ERC1155_CLEAR_SIGNED_SELECTORS, } from "@ledgerhq/evm-tools/selectors/index";
import { encode, decode } from "@ethersproject/rlp";
export { ERC20_CLEAR_SIGNED_SELECTORS, ERC721_CLEAR_SIGNED_SELECTORS, ERC1155_CLEAR_SIGNED_SELECTORS, };
export const padHexString = (str) => {
return str.length % 2 ? "0" + str : str;
};
export function splitPath(path) {
const result = [];
const components = path.split("/");
components.forEach(element => {
let number = parseInt(element, 10);
if (isNaN(number)) {
return; // FIXME shouldn't it throws instead?
}
if (element.length > 1 && element[element.length - 1] === "'") {
number += 0x80000000;
}
result.push(number);
});
return result;
}
export function hexBuffer(str) {
const strWithoutPrefix = str.startsWith("0x") ? str.slice(2) : str;
return Buffer.from(padHexString(strWithoutPrefix), "hex");
}
export function maybeHexBuffer(str) {
if (!str)
return null;
return hexBuffer(str);
}
export const decodeTxInfo = (rawTx) => {
const VALID_TYPES = [1, 2];
const txType = VALID_TYPES.includes(rawTx[0]) ? rawTx[0] : null;
const rlpData = txType === null ? rawTx : rawTx.slice(1);
const rlpTx = decode(rlpData).map(hex => Buffer.from(hex.slice(2), "hex"));
let chainIdTruncated = 0;
const rlpDecoded = decode(rlpData);
let decodedTx;
if (txType === 2) {
// EIP1559
decodedTx = {
data: rlpDecoded[7],
to: rlpDecoded[5],
chainId: rlpTx[0],
};
}
else if (txType === 1) {
// EIP2930
decodedTx = {
data: rlpDecoded[6],
to: rlpDecoded[4],
chainId: rlpTx[0],
};
}
else {
// Legacy tx
decodedTx = {
data: rlpDecoded[5],
to: rlpDecoded[3],
// Default to 1 for non EIP 155 txs
chainId: rlpTx.length > 6 ? rlpTx[6] : Buffer.from("0x01", "hex"),
};
}
const chainIdSrc = decodedTx.chainId;
let chainId = new BigNumber(0);
if (chainIdSrc) {
// Using BigNumber because chainID could be any uint256.
chainId = new BigNumber(chainIdSrc.toString("hex"), 16);
const chainIdTruncatedBuf = Buffer.alloc(4);
if (chainIdSrc.length > 4) {
chainIdSrc.copy(chainIdTruncatedBuf);
}
else {
chainIdSrc.copy(chainIdTruncatedBuf, 4 - chainIdSrc.length);
}
chainIdTruncated = chainIdTruncatedBuf.readUInt32BE(0);
}
let vrsOffset = 0;
if (txType === null && rlpTx.length > 6) {
const rlpVrs = Buffer.from(encode(rlpTx.slice(-3)).slice(2), "hex");
vrsOffset = rawTx.length - (rlpVrs.length - 1);
// First byte > 0xf7 means the length of the list length doesn't fit in a single byte.
if (rlpVrs[0] > 0xf7) {
// Increment vrsOffset to account for that extra byte.
vrsOffset++;
// Compute size of the list length.
const sizeOfListLen = rlpVrs[0] - 0xf7;
// Increase rlpOffset by the size of the list length.
vrsOffset += sizeOfListLen - 1;
}
}
return {
decodedTx,
txType,
chainId,
chainIdTruncated,
vrsOffset,
};
};
/**
* @ignore for the README
*
* Helper to convert an integer as a hexadecimal string with the right amount of digits
* to respect the number of bytes given as parameter
*
* @param int Integer
* @param bytes Number of bytes it should be represented as (1 byte = 2 caraters)
* @returns The given integer as an hexa string padded with the right number of 0
*/
export const intAsHexBytes = (int, bytes) => int.toString(16).padStart(2 * bytes, "0");
export const tokenSelectors = Object.values(ERC20_CLEAR_SIGNED_SELECTORS);
export const nftSelectors = [
...Object.values(ERC721_CLEAR_SIGNED_SELECTORS),
...Object.values(ERC1155_CLEAR_SIGNED_SELECTORS),
];
export const mergeResolutions = (resolutionsArray) => {
const mergedResolutions = {
nfts: [],
erc20Tokens: [],
externalPlugin: [],
plugin: [],
domains: [],
};
for (const resolutions of resolutionsArray) {
for (const key in resolutions) {
mergedResolutions[key].push(...resolutions[key]);
}
}
return mergedResolutions;
};
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