feat(abstract-cosmos): add contract call decoding

modules/abstract-cosmos/src/lib/ContractCallBuilder.ts

@@ -1,6 +1,5 @@
 import { TransactionType } from '@bitgo/sdk-core';
 import { BaseCoin as CoinConfig } from '@bitgo/statics';
-import { fromBase64 } from '@cosmjs/encoding';
 
 import * as constants from './constants';
 import { CosmosTransactionMessage, ExecuteContractMessage, MessageData } from './iface';
@@ -20,32 +19,24 @@ export class ContractCallBuilder<CustomMessage = never> extends CosmosTransactio
   }
 
   /** @inheritdoc */
-  messages(messages: (CosmosTransactionMessage<CustomMessage> | MessageData<CustomMessage>)[]): this {
+  messages(messages: (CosmosTransactionMessage<CustomMessage> | Partial<MessageData<CustomMessage>>)[]): this {
     this._messages = messages.map((message) => {
-      const msg = message as MessageData<CustomMessage>;
-      const { typeUrl, value } = msg;
-
-      // Handle pre-encoded messages (base64 string input)
-      if (typeUrl && typeof value === 'string') {
-        try {
-          return { typeUrl, value: fromBase64(value) } as MessageData<CustomMessage>;
-        } catch (err: unknown) {
-          throw new Error(`Invalid base64 string in message value: ${String(err)}`);
-        }
+      const executeContractMessage = message as ExecuteContractMessage;
+
+      if (!executeContractMessage.msg) {
+        // Pre-encoded message from deserialization round-trip
+        return message as MessageData<CustomMessage>;
       }
 
-      // Handle already-encoded messages (Uint8Array from deserialization)
-      if (typeUrl && value instanceof Uint8Array) {
-        return { typeUrl, value } as MessageData<CustomMessage>;
+      if (CosmosUtils.isGroupProposal(executeContractMessage)) {
+        return {
+          typeUrl: constants.groupProposalMsgTypeUrl,
+          value: executeContractMessage.msg,
+        } as MessageData<CustomMessage>;
       }
 
-      // Handle typed ExecuteContractMessage
-      const executeContractMessage = message as ExecuteContractMessage;
       this._utils.validateExecuteContractMessage(executeContractMessage, this.transactionType);
-      return {
-        typeUrl: constants.executeContractMsgTypeUrl,
-        value: executeContractMessage,
-      };
+      return { typeUrl: constants.executeContractMsgTypeUrl, value: executeContractMessage };
     });
     return this;
   }

modules/abstract-cosmos/src/lib/utils.ts

@@ -998,6 +998,70 @@ export class CosmosUtils<CustomMessage = never> implements BaseUtils {
       ),
     ];
   }
+
+  /**
+   * Checks if an ExecuteContractMessage's msg field contains a group proposal.
+   * @param {ExecuteContractMessage} message - The execute contract message to check
+   * @returns {boolean} true if the msg decodes to a group proposal
+   */
+  static isGroupProposal(message: ExecuteContractMessage): boolean {
+    if (!message.msg || message.msg.length === 0) {
+      return false;
+    }
+    const result = CosmosUtils.decodeMsg(message.msg);
+    return result.typeUrl === constants.groupProposalMsgTypeUrl;
+  }
+
+  /**
+   * Decodes a protobuf message and determines its type.
+   *
+   * @param data - Message data as base64 string or Uint8Array
+   * @returns Decoded message result with typeUrl if successfully identified
+   */
+  static decodeMsg(data: string | Uint8Array): { typeUrl?: string; error?: string } {
+    try {
+      const messageBytes = typeof data === 'string' ? Buffer.from(data, 'base64') : data;
+
+      try {
+        const proposal = MsgSubmitProposal.decode(messageBytes);
+        if (
+          proposal.groupPolicyAddress &&
+          typeof proposal.groupPolicyAddress === 'string' &&
+          proposal.groupPolicyAddress.length > 0 &&
+          Array.isArray(proposal.proposers) &&
+          proposal.proposers.length > 0
+        ) {
+          return { typeUrl: constants.groupProposalMsgTypeUrl };
+        }
+      } catch {
+        // Not a group proposal
+      }
+
+      try {
+        const executeMsg = MsgExecuteContract.decode(messageBytes);
+        if (
+          executeMsg.sender &&
+          typeof executeMsg.sender === 'string' &&
+          executeMsg.sender.length > 0 &&
+          executeMsg.contract &&
+          typeof executeMsg.contract === 'string' &&
+          executeMsg.contract.length > 0 &&
+          executeMsg.msg instanceof Uint8Array &&
+          executeMsg.msg.length > 0
+        ) {
+          return { typeUrl: constants.executeContractMsgTypeUrl };
+        }
+      } catch {
+        // Not an execute contract message
+      }
+
+      return { error: 'Unable to decode message as any known type' };
+    } catch (error) {
+      return {
+        error: error instanceof Error ? error.message : 'Failed to decode message',
+      };
+    }
+  }
 }
 
 const utils = new CosmosUtils();

modules/sdk-coin-hash/test/unit/transactionBuilder/contractCallBuilder.ts

@@ -4,7 +4,7 @@ import { TestBitGo, TestBitGoAPI } from '@bitgo/sdk-test';
 import { fromBase64, toHex } from '@cosmjs/encoding';
 import should from 'should';
 import { Hash, Thash } from '../../../src';
-import { TEST_CONTRACT_CALL } from '../../resources/hash';
+import { TEST_CONTRACT_CALL, testnetAddress } from '../../resources/hash';
 
 describe('Hash ContractCall Builder', () => {
   let bitgo: TestBitGoAPI;
@@ -24,17 +24,12 @@ describe('Hash ContractCall Builder', () => {
     txBuilder.feeGranter(TEST_CONTRACT_CALL.feeGranter);
     txBuilder.publicKey(toHex(fromBase64(TEST_CONTRACT_CALL.pubKey)));
 
-    // Wrap the inner message in a group proposal
-    // const wrappedMessage = wrapInGroupProposal(
-    //   TEST_CONTRACT_CALL.preEncodedMessageValue,
-    //   TEST_CONTRACT_CALL.proposer,
-    //   testnetAddress.groupPolicyAddress
-    // );
-
     txBuilder.messages([
       {
-        typeUrl: '/cosmos.group.v1.MsgSubmitProposal',
-        value: TEST_CONTRACT_CALL.encodedProposal,
+        sender: TEST_CONTRACT_CALL.proposer,
+        contract: testnetAddress.groupPolicyAddress,
+        msg: fromBase64(TEST_CONTRACT_CALL.encodedProposal),
+        funds: [],
       },
     ]);
     return txBuilder;

modules/sdk-coin-hash/test/unit/utils.ts

@@ -1,8 +1,9 @@
 import should from 'should';
+import { CosmosUtils } from '@bitgo/abstract-cosmos';
 
 import utils from '../../src/lib/utils';
 import * as testData from '../resources/hash';
-import { blockHash, txIds } from '../resources/hash';
+import { blockHash, txIds, TEST_CONTRACT_CALL } from '../resources/hash';
 
 describe('utils', () => {
   it('should validate block hash correctly', () => {
@@ -44,4 +45,75 @@ describe('utils', () => {
       'transactionBuilder: validateAmount: Invalid denom: ' + testData.coinAmounts.amount5.denom
     );
   });
+
+  describe('decodeMsg', () => {
+    it('should detect valid base64-encoded group proposal', () => {
+      const result = CosmosUtils.decodeMsg(TEST_CONTRACT_CALL.encodedProposal);
+
+      should.exist(result.typeUrl);
+      if (result.typeUrl) {
+        result.typeUrl.should.equal('/cosmos.group.v1.MsgSubmitProposal');
+      }
+      should.not.exist(result.error);
+    });
+
+    it('should reject invalid base64 string', () => {
+      const result = CosmosUtils.decodeMsg('not-valid-base64!!!');
+
+      should.not.exist(result.typeUrl);
+      should.exist(result.error);
+    });
+
+    it('should reject valid base64 but invalid protobuf', () => {
+      const result = CosmosUtils.decodeMsg(Buffer.from('random data').toString('base64'));
+
+      should.not.exist(result.typeUrl);
+      should.exist(result.error);
+    });
+
+    it('should reject hex-encoded contract call data', () => {
+      const result = CosmosUtils.decodeMsg('7b22696e6372656d656e74223a7b7d7d');
+
+      should.not.exist(result.typeUrl);
+    });
+
+    it('should accept Uint8Array input', () => {
+      const bytes = Buffer.from(TEST_CONTRACT_CALL.encodedProposal, 'base64');
+      const result = CosmosUtils.decodeMsg(bytes);
+
+      should.exist(result.typeUrl);
+      if (result.typeUrl) {
+        result.typeUrl.should.equal('/cosmos.group.v1.MsgSubmitProposal');
+      }
+    });
+  });
+
+  describe('isGroupProposal', () => {
+    it('should return true when msg contains a group proposal', () => {
+      const message = {
+        sender: 'tp1tazefwk2e372fy2jq08w6lztg9yrrvс490r2gp4vt8d0fchlrfqqyahg0u',
+        contract: 'tp12nyn83ynewtmpkw32wq6dg83wx8nqpat65gcld',
+        msg: Buffer.from(TEST_CONTRACT_CALL.encodedProposal, 'base64'),
+      };
+      should.equal(CosmosUtils.isGroupProposal(message), true);
+    });
+
+    it('should return false when msg contains regular contract call data', () => {
+      const message = {
+        sender: 'tp1tazefwk2e372fy2jq08w6lztg9yrrvс490r2gp4vt8d0fchlrfqqyahg0u',
+        contract: 'tp12nyn83ynewtmpkw32wq6dg83wx8nqpat65gcld',
+        msg: Buffer.from(JSON.stringify({ increment: {} })),
+      };
+      should.equal(CosmosUtils.isGroupProposal(message), false);
+    });
+
+    it('should return false when msg is empty', () => {
+      const message = {
+        sender: 'tp1tazefwk2e372fy2jq08w6lztg9yrrvс490r2gp4vt8d0fchlrfqqyahg0u',
+        contract: 'tp12nyn83ynewtmpkw32wq6dg83wx8nqpat65gcld',
+        msg: new Uint8Array(0),
+      };
+      should.equal(CosmosUtils.isGroupProposal(message), false);
+    });
+  });
 });