@ledgerhq/coin-mina
Version:
84 lines • 2.52 kB
JavaScript
import { BigNumber } from "bignumber.js";
import { CoinType } from "@ledgerhq/types-cryptoassets";
import { MAX_MEMO_LENGTH, MINA_DECODED_ADDRESS_LENGTH } from "../consts";
import bs58check from "bs58check";
/*
* Validate a Mina address.
*/
export function isValidAddress(address) {
try {
if (!address.toLowerCase().startsWith("b62")) {
return false;
}
const decodedAddress = Buffer.from(bs58check.decode(address)).toString("hex");
return !!decodedAddress && decodedAddress.length === MINA_DECODED_ADDRESS_LENGTH;
}
catch {
return false;
}
}
export const isValidMemo = (memo) => {
return memo.length <= MAX_MEMO_LENGTH;
};
// Get the account number from the path
export const getAccountNumFromPath = (path) => {
const parts = path.split("'/");
if (parts.length === 3) {
return;
}
if (parts[1] !== `${CoinType.MINA}`) {
return;
}
try {
const acc = parseInt(parts[2], 10);
if (acc >= 0) {
return acc;
}
return;
}
catch {
return;
}
};
/*
* Get the max amount that can be spent, taking into account tx type and pending operations.
*/
export const getMaxAmount = (a, _t, fees) => {
let maxAmount;
let pendingDefaultAmount = new BigNumber(0);
a.pendingOperations.forEach(({ value }) => {
pendingDefaultAmount = pendingDefaultAmount.plus(value);
});
maxAmount = a.spendableBalance.minus(pendingDefaultAmount);
if (fees) {
maxAmount = maxAmount.minus(fees);
}
if (maxAmount === undefined || maxAmount.lt(0)) {
return new BigNumber(0);
}
return maxAmount;
};
export const getTotalSpent = (a, t, fees) => {
if (t.useAllAmount) {
return a.spendableBalance;
}
return new BigNumber(t.amount).plus(fees);
};
// reEncodeRawSignature takes a raw signature in the form of a 128-character hex string and returns a re-encoded version of it.
export function reEncodeRawSignature(rawSignature) {
function shuffleBytes(hex) {
const bytes = hex.match(/.{2}/g);
if (!bytes) {
throw "Invalid hex input";
}
bytes.reverse();
return bytes.join("");
}
if (rawSignature.length !== 128) {
throw "Invalid raw signature input";
}
const field = rawSignature.substring(0, 64);
const scalar = rawSignature.substring(64);
return shuffleBytes(field) + shuffleBytes(scalar);
}
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