fix(cardano-services-client): enhance token metadata mapping to include on-chain metadata fields

Author: mirceahasegan

packages/cardano-services-client/src/AssetInfoProvider/BlockfrostAssetProvider.ts

@@ -116,16 +116,16 @@ export class BlockfrostAssetProvider extends BlockfrostProvider implements Asset
   private mapTokenMetadata(assetId: Cardano.AssetId, asset: Responses['asset']): Asset.TokenMetadata {
     return {
       assetId,
-      decimals: asset.metadata?.decimals || undefined,
+      decimals: asset.metadata?.decimals || asset.onchain_metadata?.decimals || undefined,
       desc: this.metadatumToString(
         asset.metadata?.description || (asset.onchain_metadata?.description as string | string[] | undefined)
       ),
       icon: this.metadatumToString(
         asset.metadata?.logo || (asset.onchain_metadata?.image as string | string[] | undefined)
       ),
       name: asset.metadata?.name || (asset.onchain_metadata?.name as string | undefined),
-      ticker: asset.metadata?.ticker || undefined,
-      url: asset.metadata?.url || undefined,
+      ticker: asset.metadata?.ticker || asset.onchain_metadata?.ticker || undefined,
+      url: asset.metadata?.url || asset.onchain_metadata?.url || undefined,
       version: '1.0'
     };
   }

packages/cardano-services-client/test/AssetInfoProvider/BlockfrostAssetProvider.test.ts

@@ -214,5 +214,47 @@ describe('BlockfrostAssetProvider', () => {
 
       expect(response.nftMetadata!.version).toBe('2.0');
     });
+
+    test('uses decimal and ticker from onchain_metadata', async () => {
+      const mockedAssetIdOnChainMetadata = Cardano.AssetId(
+        'ecbe846aa1a535579d67f9480fa6173b64d7e239df0460eba36e3ad00014df1053617475726e'
+      );
+      mockResponses(request, [
+        [
+          `assets/${mockedAssetIdOnChainMetadata}`,
+          {
+            asset: mockedAssetIdOnChainMetadata,
+            policy_id: 'ecbe846aa1a535579d67f9480fa6173b64d7e239df0460eba36e3ad0',
+            asset_name: '0014df1053617475726e',
+            fingerprint: 'asset1lnu3hw2pjw8xfprg7722mh0yu2vfzvk8ta60h0',
+            quantity: '100000000000000',
+            initial_mint_tx_hash: 'dcdd8ed32a71523a8393caab9d657964e50648fe0277de77add22b839e6fdb88',
+            mint_or_burn_count: 1,
+            onchain_metadata: {
+              url: 'ipfs://Qmc2RWQxCmAaXn7YGZsXCcs2J5',
+              logo: 'ipfs://Qmc2RWQxCmAaXn7YGZsXCcs2J5uwW8qQwYzmjh1gUiZBWA',
+              name: 'Saturn',
+              ticker: 'SATURN',
+              decimals: 6,
+              mediaType: '49696d6167652f706e67',
+              description:
+                'Saturn is the governance token for the Saturn Swap protocol, a fast and simple decentralized exchange on the Cardano blockchain. https://saturnswap.io/'
+            },
+            onchain_metadata_standard: 'CIP68v1',
+            onchain_metadata_extra: 'd8799fff',
+            metadata: null
+          }
+        ]
+      ]);
+
+      const response = await provider.getAsset({
+        assetId: mockedAssetIdOnChainMetadata,
+        extraData: { tokenMetadata: true }
+      });
+
+      expect(response.tokenMetadata!.decimals).toBe(6);
+      expect(response.tokenMetadata!.ticker).toBe('SATURN');
+      expect(response.tokenMetadata!.url).toBe('ipfs://Qmc2RWQxCmAaXn7YGZsXCcs2J5');
+    });
   });
 });