@fairmint/canton-node-sdk/build/src/utils/amulet/select-funding-amulets.js

Canton Node SDK

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.selectLockedAmuletForAmount = selectLockedAmuletForAmount;
function isExpired(lockExpiresAt, nowMs) {
    if (!lockExpiresAt) {
        return false;
    }
    const parsed = Date.parse(lockExpiresAt);
    if (Number.isNaN(parsed)) {
        return false;
    }
    return parsed <= nowMs;
}
/**
 * Select a locked amulet that can fund the required amount. By default the smallest qualifying amulet is returned to
 * avoid overspending.
 */
function selectLockedAmuletForAmount(amulets, amountNeeded, options = {}) {
    if (!Number.isFinite(amountNeeded) || amountNeeded <= 0) {
        throw new Error('selectLockedAmuletForAmount requires a positive amountNeeded');
    }
    const { requireExclusiveHolder = true, rejectExpiredLocks = true, nowMs = Date.now() } = options;
    const candidates = amulets
        .filter((amulet) => amulet.effectiveAmount >= amountNeeded)
        .filter((amulet) => {
        if (requireExclusiveHolder && amulet.holders.length > 1) {
            return false;
        }
        if (rejectExpiredLocks && isExpired(amulet.lockExpiresAt, nowMs)) {
            return false;
        }
        return true;
    })
        .sort((a, b) => a.effectiveAmount - b.effectiveAmount);
    const [selected] = candidates;
    return selected ?? null;
}
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