Cashu NUTs

// Source: components/blocks/rebalance/routing.ts
// Supports middleman routing chains for mints that can't swap directly

const isNostrPaymentRequest = (data: string): boolean => {
  const trimmed = data.trim();
  if (!trimmed.startsWith('creqA')) {
    return false;
  }

  try {
    const decoded = decodePaymentRequest(trimmed);
    // Check if it has a nostr transport
    const nostrTransport = decoded.transport?.find(
      (t) => t.type === PaymentRequestTransportType.NOSTR
    );
    return !!nostrTransport;
  } catch {
    return false;
  }
};

const getValidMints = (allowedMints: string[] | undefined, minAmount: number | undefined) => {
  return trustedMints.filter((mint) => {
    const balance = mintBalances[mint.mintUrl] || 0;
    // If allowedMints specified, mint must be in the list
    if (allowedMints && allowedMints.length > 0 && !allowedMints.includes(mint.mintUrl)) {
      return false;
    }
    // If minAmount specified, mint must have sufficient balance
    if (minAmount !== undefined && minAmount > 0 && balance < minAmount) {
      return false;
    }
    // Must have some balance for sending
    if (balance === 0) {
      return false;
    }
    return true;
  });
};

export function isValidEcashToken(token: string): boolean {
  try {
    getDecodedToken(token);
    return true;
  } catch {
    return false;
  }
}

if (isValidEcashToken(scanning.data)) {
  addScan(scanning.data, scanning.data, 'ecash', source);

  router.navigate({
    pathname: '/(receive-flow)/receiveToken',
    params: {
      receiveHistoryEntry: JSON.stringify(buildReceiveHistoryEntry(scanning.data)),
    },
  });
  return { urInProgress: false };
}

// package.json
{
  "@cashu/cashu-ts": "^3.3.0",
  "coco-cashu-core": "^1.1.2-rc.47",
  "coco-cashu-expo-sqlite": "1.1.2-rc.47",
  "coco-cashu-plugin-npc": "2.3.1",
  "coco-cashu-react": "1.1.2-rc.47"
}