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/**
* Maps of payment credentials and reward accounts (stake addresses) grouped by their addresses.
*
* Note: We use RewardAccount for stake keys because it's a stake address (credential + network ID),
* which is what we need for API queries. It's a superset of what a pure credential would be.
*/
export interface CredentialMaps {
/** Payment credentials (bech32: addr_vkh for KeyHash, script for ScriptHash) - network-agnostic */
paymentCredentials: Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>;
/** Reward accounts / stake addresses (bech32: stake/stake_test) - includes network ID */
rewardAccounts: Map<Cardano.RewardAccount, Cardano.PaymentAddress[]>;
}
export interface AddressGroups extends CredentialMaps {
skippedAddresses: {
byron: Cardano.PaymentAddress[];
pointer: Cardano.PaymentAddress[];
};
}
/** Parses an address, handling both bech32 and base58 formats */
const parseAddress = (address: Cardano.PaymentAddress): Cardano.Address | null => {
try {
return Cardano.Address.fromBech32(address);
} catch {
try {
return Cardano.Address.fromBase58(address);
} catch {
return null;
}
}
};
/** Extracts payment credential from an address if available */
const extractPaymentCredential = (address: Cardano.PaymentAddress): Cardano.PaymentCredential | null => {
const parsed = parseAddress(address);
Iif (!parsed) return null;
// Byron addresses don't have payment credentials we can extract
if (parsed.asByron()) return null;
// Try BaseAddress
const baseAddress = parsed.asBase();
if (baseAddress) {
const credential = baseAddress.getPaymentCredential();
return Cardano.PaymentCredential.fromCredential(credential);
}
// Try EnterpriseAddress
const enterpriseAddress = parsed.asEnterprise();
if (enterpriseAddress) {
const credential = enterpriseAddress.getPaymentCredential();
return Cardano.PaymentCredential.fromCredential(credential);
}
// Try PointerAddress
const pointerAddress = parsed.asPointer();
if (pointerAddress) {
const credential = pointerAddress.getPaymentCredential();
return Cardano.PaymentCredential.fromCredential(credential);
}
return null;
};
/**
* Creates a filter predicate that checks if an address has a payment credential we control.
* Pure function that creates a filter based on controlled payment credentials.
*
* This filter is used to filter UTXOs returned from reward account (stake address) queries,
* ensuring we only include UTXOs where we control the payment credential.
*
* Critical assumption: All addresses provided as input are addresses where the caller
* controls the payment credential. This assumption is fundamental to the filtering logic.
*
* Performance optimization: The filter first checks for exact address matches (O(1) Set lookup)
* before attempting more expensive credential extraction and comparison.
*
* @param addresses Array of payment addresses whose payment credentials we control
* @returns Filter function that returns true if the address has a controlled payment credential
* @example
* ```typescript
* const myAddresses = ['addr1...', 'addr_test1...'];
* const filter = createPaymentCredentialFilter(myAddresses);
*
* // Filter UTXOs from a stake address query
* const filteredUtxos = allUtxos.filter(utxo => filter(utxo[0]));
* ```
*/
export const createPaymentCredentialFilter = (
addresses: Cardano.PaymentAddress[]
): ((address: Cardano.PaymentAddress) => boolean) => {
// Build Set of exact addresses for O(1) fast path lookup
const exactAddresses = new Set<Cardano.PaymentAddress>(addresses);
// Extract all payment credentials from input addresses
const controlledCredentials = new Set<Cardano.PaymentCredential>();
for (const address of addresses) {
const credential = extractPaymentCredential(address);
if (credential) {
controlledCredentials.add(credential);
}
}
// Return filter function
return (address: Cardano.PaymentAddress): boolean => {
// Fast path: exact address match
if (exactAddresses.has(address)) {
return true;
}
// Slow path: extract payment credential and check if controlled
const credential = extractPaymentCredential(address);
if (!credential) {
return false;
}
return controlledCredentials.has(credential);
};
};
/** Adds a credential to the map, creating the array if needed */
const addToCredentialMap = <T extends string>(
map: Map<T, Cardano.PaymentAddress[]>,
credential: T,
address: Cardano.PaymentAddress
) => {
if (!map.has(credential)) {
map.set(credential, []);
}
map.get(credential)!.push(address);
};
/** Processes a BaseAddress, extracting payment credential and reward account (stake address) */
const processBaseAddress = (
baseAddress: Cardano.BaseAddress,
parsedAddress: Cardano.Address,
address: Cardano.PaymentAddress,
paymentCredentials: Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>,
rewardAccounts: Map<Cardano.RewardAccount, Cardano.PaymentAddress[]>
) => {
const paymentCredential = baseAddress.getPaymentCredential();
const paymentBech32 = Cardano.PaymentCredential.fromCredential(paymentCredential);
addToCredentialMap(paymentCredentials, paymentBech32, address);
const stakeCredential = baseAddress.getStakeCredential();
const networkId = parsedAddress.getNetworkId();
const rewardAccount = Cardano.RewardAccount.fromCredential(stakeCredential, networkId);
addToCredentialMap(rewardAccounts, rewardAccount, address);
};
/** Processes an EnterpriseAddress, extracting payment credential only */
const processEnterpriseAddress = (
enterpriseAddress: Cardano.EnterpriseAddress,
address: Cardano.PaymentAddress,
paymentCredentials: Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>
) => {
const paymentCredential = enterpriseAddress.getPaymentCredential();
const paymentBech32 = Cardano.PaymentCredential.fromCredential(paymentCredential);
addToCredentialMap(paymentCredentials, paymentBech32, address);
};
/**
* Extracts and groups payment credentials and reward accounts (stake addresses) from addresses.
* Pure function - no logging or side effects.
*
* @param addresses Array of payment addresses to extract credentials/addresses from
* @returns Grouped payment credentials, reward accounts (stake addresses), and skipped addresses
*/
export const extractCredentials = (addresses: Cardano.PaymentAddress[]): AddressGroups => {
const paymentCredentials = new Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>();
const rewardAccounts = new Map<Cardano.RewardAccount, Cardano.PaymentAddress[]>();
const byron: Cardano.PaymentAddress[] = [];
const pointer: Cardano.PaymentAddress[] = [];
const seenAddresses = new Set<Cardano.PaymentAddress>();
for (const address of addresses) {
if (seenAddresses.has(address)) continue;
seenAddresses.add(address);
const parsedAddress = parseAddress(address);
Iif (!parsedAddress) continue;
if (parsedAddress.asByron()) {
byron.push(address);
continue;
}
if (parsedAddress.asPointer()) {
pointer.push(address);
continue;
}
const baseAddress = parsedAddress.asBase();
if (baseAddress) {
processBaseAddress(baseAddress, parsedAddress, address, paymentCredentials, rewardAccounts);
continue;
}
const enterpriseAddress = parsedAddress.asEnterprise();
if (enterpriseAddress) {
processEnterpriseAddress(enterpriseAddress, address, paymentCredentials);
}
}
return {
paymentCredentials,
rewardAccounts,
skippedAddresses: {
byron,
pointer
}
};
};
interface CredentialInfo {
addresses: Cardano.PaymentAddress[];
credential: Cardano.PaymentCredential | Cardano.RewardAccount;
type: 'payment' | 'stake';
uncoveredCount: number;
}
/** Builds a list of all payment credentials and reward accounts with their coverage info */
const buildCredentialList = (
paymentCredentials: Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>,
rewardAccounts: Map<Cardano.RewardAccount, Cardano.PaymentAddress[]>
): CredentialInfo[] => {
const allCredentials: CredentialInfo[] = [];
for (const [credential, addresses] of paymentCredentials.entries()) {
if (addresses.length > 0) {
allCredentials.push({
addresses,
credential,
type: 'payment',
uncoveredCount: addresses.length
});
}
}
for (const [rewardAccount, addresses] of rewardAccounts.entries()) {
if (addresses.length > 0) {
allCredentials.push({
addresses,
credential: rewardAccount,
type: 'stake',
uncoveredCount: addresses.length
});
}
}
return allCredentials;
};
/** Updates uncovered counts for all credentials */
const updateUncoveredCounts = (credentialInfos: CredentialInfo[], coveredAddresses: Set<Cardano.PaymentAddress>) => {
for (const info of credentialInfos) {
info.uncoveredCount = info.addresses.filter((addr) => !coveredAddresses.has(addr)).length;
}
};
/** Finds the best credential to use (most coverage, prefer payment over stake on tie) */
const findBestCredential = (credentialInfos: CredentialInfo[]): CredentialInfo | null => {
let maxInfo: CredentialInfo | null = null;
for (const info of credentialInfos) {
if (info.uncoveredCount === 0) continue;
if (maxInfo === null) {
maxInfo = info;
continue;
}
const hasMoreCoverage = info.uncoveredCount > maxInfo.uncoveredCount;
const hasSameCoverageButPreferPayment =
info.uncoveredCount === maxInfo.uncoveredCount && info.type === 'payment' && maxInfo.type === 'stake';
if (hasMoreCoverage || hasSameCoverageButPreferPayment) {
maxInfo = info;
}
}
return maxInfo;
};
/** Adds selected credential/address to result maps */
const addToResultMaps = (
selectedCredential: CredentialInfo,
minimizedPayment: Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>,
minimizedRewardAccounts: Map<Cardano.RewardAccount, Cardano.PaymentAddress[]>
) => {
if (selectedCredential.type === 'payment') {
minimizedPayment.set(selectedCredential.credential as Cardano.PaymentCredential, selectedCredential.addresses);
} else {
minimizedRewardAccounts.set(selectedCredential.credential as Cardano.RewardAccount, selectedCredential.addresses);
}
};
/**
* Finds the minimum set of payment credentials and reward accounts that cover all addresses using a greedy algorithm.
* Prefers payment credentials over reward accounts (stake addresses) when coverage is equal.
* Pure function - no logging or side effects.
*
* @param credentials Payment credentials and reward accounts maps
* @returns Minimized credential maps
*/
export const minimizeCredentialSet = (credentials: CredentialMaps): CredentialMaps => {
const { paymentCredentials, rewardAccounts } = credentials;
const coveredAddresses = new Set<Cardano.PaymentAddress>();
const minimizedPayment = new Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>();
const minimizedRewardAccounts = new Map<Cardano.RewardAccount, Cardano.PaymentAddress[]>();
const allCredentials = buildCredentialList(paymentCredentials, rewardAccounts);
// Greedy algorithm: repeatedly pick the credential/address that covers the most uncovered addresses
while (allCredentials.some((info) => info.uncoveredCount > 0)) {
updateUncoveredCounts(allCredentials, coveredAddresses);
const selectedCredential = findBestCredential(allCredentials);
if (!selectedCredential || selectedCredential.uncoveredCount === 0) break;
addToResultMaps(selectedCredential, minimizedPayment, minimizedRewardAccounts);
// Mark all addresses covered by this credential
for (const addr of selectedCredential.addresses) {
coveredAddresses.add(addr);
}
}
return {
paymentCredentials: minimizedPayment,
rewardAccounts: minimizedRewardAccounts
};
};
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