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import { Assets } from '../types';
import { Logger } from 'ts-log';
import { Observable, firstValueFrom } from 'rxjs';
import { isNotNil } from '@cardano-sdk/util';
export interface AssetProviderContext {
assetProvider: AssetProvider;
assetInfo$: Observable<Assets>;
tx?: Cardano.Tx;
logger: Logger;
}
const tryCip68NftMetadata = (
policyId: Cardano.PolicyId,
name: Cardano.AssetName,
tx: Cardano.Tx,
logger: Logger
): Asset.NftMetadata | null => {
const decoded = Asset.AssetNameLabel.decode(name);
if (decoded?.label === Asset.AssetNameLabelNum.UserNFT) {
const referenceAssetId = Cardano.AssetId.fromParts(
policyId,
Asset.AssetNameLabel.encode(decoded.content, Asset.AssetNameLabelNum.ReferenceNFT)
);
// TODO: It is possible that the reference NFT is not in one of the outputs of the transaction and was previously minted. We
// need a way to find the reference NFT TxOut from the current active UTXO set on the network.
for (const output of tx.body.outputs) {
if (output.value.assets?.get(referenceAssetId)) {
return Asset.NftMetadata.fromPlutusData(output.datum, logger);
}
}
}
return null;
};
const getNftMetadata = (
name: Cardano.AssetName,
policyId: Cardano.PolicyId,
tx: Cardano.Tx,
logger: Logger
): Asset.NftMetadata | null => {
// First, try CIP-68
let metadata = tryCip68NftMetadata(policyId, name, tx, logger);
// If metadata is not found, try CIP-25
if (!metadata) {
metadata = tx.auxiliaryData?.blob
? Asset.NftMetadata.fromMetadatum({ name, policyId }, tx.auxiliaryData.blob, logger)
: null;
}
return metadata;
};
const createAssetInfo = (assetId: Cardano.AssetId, amount: bigint, tx: Cardano.Tx, logger: Logger): Asset.AssetInfo => {
const name = Cardano.AssetId.getAssetName(assetId);
const policyId = Cardano.AssetId.getPolicyId(assetId);
const assetInfo: Asset.AssetInfo = {
assetId,
fingerprint: Cardano.AssetFingerprint.fromParts(policyId, name),
name,
policyId,
quantity: amount,
supply: amount
};
assetInfo.nftMetadata = getNftMetadata(name, policyId, tx, logger);
return assetInfo;
};
const getMintedAssetInfosFromTx = async (tx: Cardano.Tx, logger: Logger): Promise<Asset.AssetInfo[] | null> => {
const mints = tx.body.mint;
if (!mints) return null;
return [...mints.entries()]
.filter(([_, amount]) => amount > 0)
.map(([assetId, amount]) => createAssetInfo(assetId, amount, tx, logger));
};
const fetchAssetsFromProvider = async (
provider: AssetProvider,
assetIds: Cardano.AssetId[],
logger: Logger
): Promise<Asset.AssetInfo[]> => {
const assetsFromProvider: Asset.AssetInfo[] = [];
// We need to fetch assets one by one because the provider will throw if any of the assets requests to the getAssets endpoint is not found.
// We want to fetch the ones we can and return a simplified AssetInfo for the ones we can't.
for (const assetId of assetIds) {
try {
const fetchedAsset = await provider.getAsset({
assetId,
extraData: { nftMetadata: true, tokenMetadata: true }
});
assetsFromProvider.push(fetchedAsset);
} catch (error) {
logger.error(error);
}
}
return assetsFromProvider;
};
const createFallbackAsset = (assetId: Cardano.AssetId): Asset.AssetInfo => {
const name = Cardano.AssetId.getAssetName(assetId);
const policyId = Cardano.AssetId.getPolicyId(assetId);
return {
assetId,
fingerprint: Cardano.AssetFingerprint.fromParts(policyId, name),
name,
policyId,
quantity: 0n,
supply: 0n
};
};
const mergeAssets = (
assetIds: Cardano.AssetId[],
cachedAssetsInfo: Map<Cardano.AssetId, Asset.AssetInfo>,
assetsFromProvider: Asset.AssetInfo[],
mintedAssets: Asset.AssetInfo[] | null
): Asset.AssetInfo[] =>
assetIds.map((assetId) => {
const asset = cachedAssetsInfo.get(assetId) || assetsFromProvider.find((a) => a.assetId === assetId);
const mintedAsset = mintedAssets?.find((info) => info.assetId === assetId);
if (!asset && !mintedAsset) {
return createFallbackAsset(assetId);
}
if (!asset && mintedAsset) {
return mintedAsset;
}
if (asset && mintedAsset) {
asset.supply += mintedAsset.supply;
asset.quantity = asset.supply;
if (mintedAsset.nftMetadata) {
asset.nftMetadata = mintedAsset.nftMetadata;
}
}
return asset!;
});
/**
* Creates a wallet asset provider. This provider will try to first fetch the asset from the local cache (assetInfo$),
* then from the provider and finally from the transaction if it was minted in the transaction. If the asset can not be found
* it will return a dummy AssetInfo with both supply and quantity set to 0.
*/
export const createWalletAssetProvider = ({
assetProvider,
assetInfo$,
tx,
logger
}: AssetProviderContext): AssetProvider => ({
async getAsset({ assetId }: GetAssetArgs): Promise<Asset.AssetInfo> {
const mintedAssets = tx ? await getMintedAssetInfosFromTx(tx, logger) : [];
const cachedAssetsInfo = await firstValueFrom(assetInfo$);
let asset = cachedAssetsInfo.get(assetId);
if (!asset) {
try {
asset = await assetProvider.getAsset({ assetId, extraData: { nftMetadata: true, tokenMetadata: true } });
} catch (error) {
logger.error(error);
}
}
const mintedAsset = mintedAssets?.find((info) => info.assetId === assetId);
// Let's create dummy AssetInfo for the unresolved asset. This is probably better than throwing as the UI can still present it as regular token.
if (!asset && !mintedAsset) {
const name = Cardano.AssetId.getAssetName(assetId);
const policyId = Cardano.AssetId.getPolicyId(assetId);
return {
assetId,
fingerprint: Cardano.AssetFingerprint.fromParts(policyId, name),
name,
policyId,
quantity: 0n,
supply: 0n
};
}
if (!asset) return mintedAsset!;
if (mintedAsset) {
asset.supply += mintedAsset.supply;
// We give preference to the metadata in the transaction if preset as this would be the most up to date.
if (mintedAsset.nftMetadata) {
asset.nftMetadata = mintedAsset.nftMetadata;
}
}
const cip68NftMetadata = tx ? tryCip68NftMetadata(asset.policyId, asset.name, tx, logger) : null;
if (cip68NftMetadata) asset.nftMetadata = cip68NftMetadata;
return asset;
},
async getAssets({ assetIds }: GetAssetsArgs): Promise<Asset.AssetInfo[]> {
const cachedAssetsInfo = await firstValueFrom(assetInfo$);
const mintedAssets = tx ? await getMintedAssetInfosFromTx(tx, logger) : [];
const missingAssetIds = assetIds.filter((assetId) => !cachedAssetsInfo.has(assetId));
const assetsFromProvider = await fetchAssetsFromProvider(assetProvider, missingAssetIds, logger);
const mergedAssets = mergeAssets(assetIds, cachedAssetsInfo, assetsFromProvider, mintedAssets);
const assets = mergedAssets.filter(isNotNil);
if (tx) {
for (const asset of assets) {
const cip68NftMetadata = tryCip68NftMetadata(asset.policyId, asset.name, tx, logger);
if (cip68NftMetadata) asset.nftMetadata = cip68NftMetadata;
}
}
return mergedAssets.filter(isNotNil);
},
healthCheck(): Promise<HealthCheckResponse> {
return assetProvider.healthCheck();
}
});
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