fix(core): info action proposal procedure serialization and de-serialization

Author: iccicci

packages/core/src/Serialization/TransactionBody/ProposalProcedure/InfoAction.ts

@@ -3,6 +3,8 @@ import { CborReader, CborWriter } from '../../CBOR';
 import { GovernanceActionKind } from './GovernanceActionKind';
 import { HexBlob, InvalidArgumentError } from '@cardano-sdk/util';
 
+const EMBEDDED_GROUP_SIZE = 1;
+
 /**
  * Represents an action that has no direct effect on the blockchain,
  * but serves as an on-chain record or informative notice.
@@ -22,6 +24,7 @@ export class InfoAction {
 
     // CDDL
     // info_action = 6
+    writer.writeStartArray(EMBEDDED_GROUP_SIZE);
     writer.writeInt(GovernanceActionKind.Info);
     return writer.encodeAsHex();
   }
@@ -35,6 +38,14 @@ export class InfoAction {
   static fromCbor(cbor: HexBlob): InfoAction {
     const reader = new CborReader(cbor);
 
+    const length = reader.readStartArray();
+
+    if (length !== EMBEDDED_GROUP_SIZE)
+      throw new InvalidArgumentError(
+        'cbor',
+        `Expected an array of ${EMBEDDED_GROUP_SIZE} elements, but got an array of ${length} elements`
+      );
+
     const kind = Number(reader.readUInt());
 
     if (kind !== GovernanceActionKind.Info)

packages/core/src/Serialization/TransactionBody/ProposalProcedure/ProposalProcedure.ts

@@ -1,6 +1,6 @@
 import * as Cardano from '../../../Cardano';
 import { Anchor } from '../../Common/Anchor';
-import { CborReader, CborReaderState, CborWriter } from '../../CBOR';
+import { CborReader, CborWriter } from '../../CBOR';
 import { GovernanceActionKind } from './GovernanceActionKind';
 import { HardForkInitiationAction } from './HardForkInitiationAction';
 import { HexBlob, InvalidStateError } from '@cardano-sdk/util';
@@ -116,15 +116,10 @@ export class ProposalProcedure {
 
     const actionReader = new CborReader(actionCbor);
 
-    let kind;
-    let action;
+    actionReader.readStartArray();
 
-    if (actionReader.peekState() === CborReaderState.UnsignedInteger) {
-      kind = Number(actionReader.readInt());
-    } else {
-      actionReader.readStartArray();
-      kind = Number(actionReader.readInt());
-    }
+    let action;
+    const kind = Number(actionReader.readInt());
 
     switch (kind) {
       case GovernanceActionKind.ParameterChange:

packages/core/test/Serialization/TransactionBody/ProposalProcedure/InfoAction.test.ts

@@ -4,7 +4,7 @@ import { HexBlob } from '@cardano-sdk/util';
 import { InfoAction } from '../../../../src/Serialization';
 
 // Test data used in the following tests was generated with the cardano-serialization-lib
-const cbor = HexBlob('06');
+const cbor = HexBlob('8106');
 const core = {
   __typename: Cardano.GovernanceActionType.info_action
 } as Cardano.InfoAction;

packages/core/test/Serialization/TransactionBody/ProposalProcedure/ProposalProcedure.test.ts

@@ -4,7 +4,7 @@ import { HexBlob } from '@cardano-sdk/util';
 import { ProposalProcedure } from '../../../../src/Serialization';
 
 const infoActionCbor = HexBlob(
-  '841a000f4240581de1cb0ec2692497b458e46812c8a5bfa2931d1a2d965a99893828ec810f06827668747470733a2f2f7777772e736f6d6575726c2e696f58200000000000000000000000000000000000000000000000000000000000000000'
+  '841a000f4240581de1cb0ec2692497b458e46812c8a5bfa2931d1a2d965a99893828ec810f8106827668747470733a2f2f7777772e736f6d6575726c2e696f58200000000000000000000000000000000000000000000000000000000000000000'
 );
 
 const infoActionCore = {