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transactionCertificates.ts
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transactionCertificates.ts
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import { Cardano, util } from '@cardano-sdk/core';
import { Observable, distinctUntilChanged, map } from 'rxjs';
import { last } from 'lodash-es';
import { transactionsEquals } from '../util/equals';
export const RegAndDeregCertificateTypes = [
Cardano.CertificateType.StakeKeyRegistration,
Cardano.CertificateType.StakeKeyDeregistration
];
export const stakeKeyCertficates = (certificates?: Cardano.Certificate[]) =>
certificates?.filter((certificate): certificate is Cardano.StakeAddressCertificate =>
RegAndDeregCertificateTypes.includes(certificate.__typename)
) || [];
export const includesAnyCertificate = (haystack: Cardano.Certificate[], needle: Cardano.CertificateType[]) =>
haystack.some(({ __typename }) => needle.includes(__typename)) || false;
export const transactionHasAnyCertificate = (
{ body: { certificates } }: Cardano.TxAlonzo,
certificateTypes: Cardano.CertificateType[]
) => includesAnyCertificate(certificates || [], certificateTypes);
export const isLastStakeKeyCertOfType = (
transactionsCertificates: Cardano.Certificate[][],
certType: Cardano.CertificateType.StakeKeyRegistration | Cardano.CertificateType.StakeKeyDeregistration,
rewardAccount?: Cardano.RewardAccount
) => {
const lastRegOrDereg = last(
transactionsCertificates
.map((certificates) => {
const allStakeKeyCertificates = stakeKeyCertficates(certificates);
const addressStakeKeyCertificates = rewardAccount
? allStakeKeyCertificates.filter(({ rewardAccount: address }) => rewardAccount === address)
: allStakeKeyCertificates;
return last(addressStakeKeyCertificates);
})
.filter(util.isNotNil)
);
return lastRegOrDereg?.__typename === certType;
};
export const transactionsWithCertificates = (
transactions$: Observable<Cardano.TxAlonzo[]>,
certificateTypes: Cardano.CertificateType[]
) =>
transactions$.pipe(
map((transactions) => transactions.filter((tx) => transactionHasAnyCertificate(tx, certificateTypes))),
distinctUntilChanged(transactionsEquals)
);