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import * as Crypto from '@cardano-sdk/crypto';
import { Cardano, ChainHistoryProvider } from '@cardano-sdk/core';
import { GroupedAddress, util as KeyManagementUtil, WitnessedTx } from '@cardano-sdk/key-management';
import { Observable, firstValueFrom } from 'rxjs';
import { ObservableWallet, ScriptAddress, isScriptAddress } from '../types';
import { ProtocolParametersRequiredByOutputValidator, createOutputValidator } from '@cardano-sdk/tx-construction';
import { txInEquals } from './util';
import uniqBy from 'lodash/uniqBy.js';
export interface InputResolverContext {
utxo: {
/** Subscribed on every InputResolver call */
available$: Observable<Cardano.Utxo[]>;
};
transactions: {
history$: Observable<Cardano.HydratedTx[]>;
outgoing: {
signed$: Observable<WitnessedTx[]>;
};
};
}
export interface WalletOutputValidatorContext {
/* Subscribed on every OutputValidator call */
protocolParameters$: Observable<ProtocolParametersRequiredByOutputValidator>;
}
export type WalletUtilContext = WalletOutputValidatorContext &
InputResolverContext & { chainHistoryProvider?: ChainHistoryProvider };
export const createInputResolver = ({ utxo, transactions }: InputResolverContext): Cardano.InputResolver => ({
async resolveInput(input: Cardano.TxIn, options?: Cardano.ResolveOptions) {
const txHistory = await firstValueFrom(transactions.history$);
const utxoAvailable = await firstValueFrom(utxo.available$, { defaultValue: [] });
const signedTransactions = await firstValueFrom(transactions.outgoing.signed$, { defaultValue: [] });
const utxoFromSigned = signedTransactions.flatMap(({ tx: signedTx }, signedTxIndex) =>
signedTx.body.outputs
.filter((_, outputIndex) => {
const alreadyConsumed = signedTransactions.some(
({ tx: { body } }, i) =>
signedTxIndex !== i &&
body.inputs.some((consumedInput) => txInEquals(consumedInput, { index: outputIndex, txId: signedTx.id }))
);
return !alreadyConsumed;
})
.map((txOut): Cardano.Utxo => {
const txIn: Cardano.HydratedTxIn = {
address: txOut.address,
index: signedTx.body.outputs.indexOf(txOut),
txId: signedTx.id
};
return [txIn, txOut];
})
);
const availableUtxo = [...utxoAvailable, ...utxoFromSigned].find(([txIn]) => txInEquals(txIn, input));
if (availableUtxo) return availableUtxo[1];
if (options?.hints) {
const tx = options?.hints.find((hint) => hint.id === input.txId);
if (tx && tx.body.outputs.length > input.index) {
return tx.body.outputs[input.index];
}
}
const historyTx = txHistory.findLast((entry) => entry.id === input.txId);
if (historyTx && historyTx.body.outputs.length > input.index) {
return historyTx.body.outputs[input.index];
}
return null;
}
});
/**
* Creates an input resolver that fetch transaction inputs from the backend.
*
* This function tries to fetch the transaction from the backend using a `ChainHistoryProvider`. It
* also caches fetched transactions to optimize subsequent input resolutions.
*
* @param provider The backend provider used to fetch transactions by their hashes if
* they are not found by the inputResolver.
* @returns An input resolver that can fetch unresolved inputs from the backend.
*/
export const createBackendInputResolver = (provider: ChainHistoryProvider): Cardano.InputResolver => {
const txCache = new Map<Cardano.TransactionId, Cardano.Tx>();
const fetchAndCacheTransaction = async (txId: Cardano.TransactionId): Promise<Cardano.Tx | null> => {
if (txCache.has(txId)) {
return txCache.get(txId)!;
}
const txs = await provider.transactionsByHashes({ ids: [txId] });
if (txs.length > 0) {
txCache.set(txId, txs[0]);
return txs[0];
}
return null;
};
return {
async resolveInput(input: Cardano.TxIn, options?: Cardano.ResolveOptions) {
// Add hints to the cache
if (options?.hints) {
for (const hint of options.hints) {
txCache.set(hint.id, hint);
}
}
const tx = await fetchAndCacheTransaction(input.txId);
if (!tx) return null;
return tx.body.outputs.length > input.index ? tx.body.outputs[input.index] : null;
}
};
};
/**
* Combines multiple input resolvers into a single resolver.
*
* @param resolvers The input resolvers to combine.
*/
export const combineInputResolvers = (...resolvers: Cardano.InputResolver[]): Cardano.InputResolver => ({
async resolveInput(txIn: Cardano.TxIn, options?: Cardano.ResolveOptions) {
for (const resolver of resolvers) {
const resolved = await resolver.resolveInput(txIn, options);
if (resolved) return resolved;
}
return null;
}
});
/**
* @returns common wallet utility functions that are aware of wallet state and computes useful things
*/
export const createWalletUtil = (context: WalletUtilContext) => ({
...createOutputValidator({ protocolParameters: () => firstValueFrom(context.protocolParameters$) }),
...(context.chainHistoryProvider
? combineInputResolvers(createInputResolver(context), createBackendInputResolver(context.chainHistoryProvider))
: createInputResolver(context))
});
export type WalletUtil = ReturnType<typeof createWalletUtil>;
/** All transaction inputs and collaterals must come from our utxo set */
const hasForeignInputs = (
{ body: { inputs, collaterals = [] } }: { body: Pick<Cardano.TxBody, 'inputs' | 'collaterals'> },
utxoSet: Cardano.Utxo[]
): boolean => [...inputs, ...collaterals].some((txIn) => utxoSet.every((utxo) => !txInEquals(txIn, utxo[0])));
/** Wallet does not include committee certificate keys, so they cannot be signed */
const hasCommitteeCertificates = ({ certificates }: Cardano.TxBody) =>
(certificates || []).some(
(certificate) =>
certificate.__typename === Cardano.CertificateType.AuthorizeCommitteeHot ||
certificate.__typename === Cardano.CertificateType.ResignCommitteeCold
);
/**
* Gets whether the given transaction has certificates that require a witness that can not be provided by the script wallet.
*
* @param rewardAccount The reward account of the script wallet.
* @param certificates The certificates to inspect.
*/
// eslint-disable-next-line complexity
const scriptWalletHasForeignCertificates = (
rewardAccount: Cardano.RewardAccount,
certificates?: Cardano.Certificate[]
// eslint-disable-next-line sonarjs/cognitive-complexity
) => {
Iif (!certificates) {
return false;
}
const scriptHash = Cardano.RewardAccount.toHash(rewardAccount) as unknown as Crypto.Hash28ByteBase16;
for (const certificate of certificates) {
switch (certificate.__typename) {
case Cardano.CertificateType.Registration:
case Cardano.CertificateType.StakeRegistration:
case Cardano.CertificateType.GenesisKeyDelegation:
continue; // Doesnt require signature.
case Cardano.CertificateType.StakeDeregistration:
case Cardano.CertificateType.StakeDelegation:
case Cardano.CertificateType.Unregistration:
case Cardano.CertificateType.VoteDelegation:
case Cardano.CertificateType.StakeVoteDelegation:
case Cardano.CertificateType.StakeRegistrationDelegation:
case Cardano.CertificateType.VoteRegistrationDelegation:
case Cardano.CertificateType.MIR:
case Cardano.CertificateType.StakeVoteRegistrationDelegation: {
if (
!certificate.stakeCredential ||
certificate.stakeCredential.type !== Cardano.CredentialType.ScriptHash ||
certificate.stakeCredential.hash !== scriptHash
) {
return true;
}
break;
}
case Cardano.CertificateType.PoolRegistration: {
const account = certificate.poolParameters.owners.find((acct) => acct === rewardAccount);
if (!account) {
return true;
}
break;
}
case Cardano.CertificateType.PoolRetirement:
{
const poolId = Cardano.PoolId.fromKeyHash(Cardano.RewardAccount.toHash(rewardAccount));
if (certificate.poolId !== poolId) {
return true;
}
}
break;
case Cardano.CertificateType.RegisterDelegateRepresentative:
case Cardano.CertificateType.UnregisterDelegateRepresentative:
case Cardano.CertificateType.UpdateDelegateRepresentative:
if (
!certificate.dRepCredential ||
certificate.dRepCredential.type !== Cardano.CredentialType.ScriptHash ||
certificate.dRepCredential.hash !== scriptHash
) {
return true;
}
break;
case Cardano.CertificateType.AuthorizeCommitteeHot:
case Cardano.CertificateType.ResignCommitteeCold:
return true;
}
}
return false;
};
/**
* Until CIP-095 supports script credential for dReps, we cant witness any voting procedures as the only
* voter type for this type of wallet is DrepScriptHashVoter
*/
const scriptWalletHasForeignVotingProcedures = (
rewardAccount: Cardano.RewardAccount,
votingProcedures?: Cardano.VotingProcedures
) => {
if (!votingProcedures) {
return false;
}
for (const procedure of votingProcedures) {
switch (procedure.voter.__typename) {
case Cardano.VoterType.ccHotKeyHash:
case Cardano.VoterType.ccHotScriptHash:
case Cardano.VoterType.stakePoolKeyHash:
case Cardano.VoterType.dRepKeyHash:
return true;
case Cardano.VoterType.dRepScriptHash: {
const scriptHash = Cardano.RewardAccount.toHash(rewardAccount) as unknown as Crypto.Hash28ByteBase16;
if (procedure.voter.credential.hash !== scriptHash) {
return true;
}
}
}
}
return false;
};
/**
* Gets whether the given TX requires signatures that can not be provided by the given wallet.
*
* @param tx The transaction to inspect.
* @param wallet The wallet that will provide the signatures.
* @returns true if the wallet can not sign all inputs/certificates; otherwise; false.
*/
export const requiresForeignSignatures = async (tx: Cardano.Tx, wallet: ObservableWallet): Promise<boolean> => {
const utxoSet = await firstValueFrom(wallet.utxo.total$);
const knownAddresses = await firstValueFrom(wallet.addresses$);
const isScriptWallet = knownAddresses.some((address) => isScriptAddress(address));
if (isScriptWallet) {
const scriptAddresses = knownAddresses.map((address) => address as ScriptAddress);
// Script addresses have a single payment credential and stake credential.
return (
hasForeignInputs(tx, utxoSet) ||
scriptWalletHasForeignCertificates(scriptAddresses[0].rewardAccount, tx.body.certificates) ||
scriptWalletHasForeignVotingProcedures(scriptAddresses[0].rewardAccount, tx.body.votingProcedures)
);
}
const keyHashAddresses = knownAddresses.map((address) => address as GroupedAddress);
const uniqueAccounts: KeyManagementUtil.StakeKeySignerData[] = uniqBy(keyHashAddresses, 'rewardAccount')
.map((groupedAddress) => {
const stakeKeyHash = Cardano.RewardAccount.toHash(groupedAddress.rewardAccount);
return {
derivationPath: groupedAddress.stakeKeyDerivationPath,
poolId: Cardano.PoolId.fromKeyHash(stakeKeyHash),
rewardAccount: groupedAddress.rewardAccount,
stakeKeyHash
};
})
.filter((acct): acct is KeyManagementUtil.StakeKeySignerData => acct.derivationPath !== null);
const dRepKey = await wallet.governance.getPubDRepKey();
const dRepKeyHash = dRepKey ? (await Crypto.Ed25519PublicKey.fromHex(dRepKey).hash()).hex() : undefined;
return (
hasForeignInputs(tx, utxoSet) ||
KeyManagementUtil.checkStakeCredentialCertificates(uniqueAccounts, tx.body).requiresForeignSignatures ||
(dRepKeyHash &&
KeyManagementUtil.getDRepCredentialKeyPaths({ dRepKeyHash, txBody: tx.body }).requiresForeignSignatures) ||
(dRepKeyHash &&
KeyManagementUtil.getVotingProcedureKeyPaths({ dRepKeyHash, groupedAddresses: keyHashAddresses, txBody: tx.body })
.requiresForeignSignatures) ||
hasCommitteeCertificates(tx.body)
);
};
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