Add transcoder for Unstake txn type. Add support for approve component for this new txn type.

Author: Lazy Nina

src/app/approve/approve.component.ts

@@ -39,7 +39,7 @@ import {
   TransactionSpendingLimit,
   TransactionMetadataRegisterAsValidator,
   TransactionMetadataUnregisterAsValidator,
-  TransactionMetadataStake,
+  TransactionMetadataStake, TransactionMetadataUnstake,
 } from '../../lib/deso/transaction';
 import { ExtraData } from '../../types/identity';
 import { AccountService } from '../account.service';
@@ -610,6 +610,18 @@ export class ApproveComponent implements OnInit {
         );
         description = `stake ${stakeAmountNanos} $DESO to ${stakeValidatorPublicKey}`;
         break;
+      case TransactionMetadataUnstake:
+        const unstakeMetadata = this.transaction
+          .metadata as TransactionMetadataUnstake;
+        const unstakeValidatorPublicKey = this.base58KeyCheck(
+          unstakeMetadata.validatorPublicKey
+        );
+        publicKeys = [unstakeValidatorPublicKey];
+        const unstakeAmountNanos= this.hexNanosToUnitString(
+          unstakeMetadata.unstakeAmountNanos
+        );
+        description = `unstake ${unstakeAmountNanos} $DESO from ${unstakeValidatorPublicKey}`;
+        break;
     }
 
     // Set the transaction description based on the description populated with public keys.

src/app/identity.service.ts

@@ -37,7 +37,7 @@ import {
   TransactionMetadataUpdateProfile,
   TransactionMetadataRegisterAsValidator,
   TransactionMetadataUnregisterAsValidator,
-  TransactionMetadataStake,
+  TransactionMetadataStake, TransactionMetadataUnstake,
 } from '../lib/deso/transaction';
 import { SwalHelper } from '../lib/helpers/swal-helper';
 import { AccessLevel, PublicUserInfo } from '../types/identity';
@@ -524,6 +524,7 @@ export class IdentityService {
       case TransactionMetadataRegisterAsValidator:
       case TransactionMetadataUnregisterAsValidator:
       case TransactionMetadataStake:
+      case TransactionMetadataUnstake:
         return AccessLevel.Full;
 
       case TransactionMetadataFollow:

src/lib/deso/transaction.ts

@@ -620,6 +620,15 @@ export class TransactionMetadataStake extends TransactionMetadata {
   stakeAmountNanos: Buffer = Buffer.alloc(0);
 }
 
+export class TransactionMetadataUnstake extends TransactionMetadata {
+  @Transcode(VarBuffer)
+  validatorPublicKey: Buffer = Buffer.alloc(0);
+
+  // TODO: We may want a better way to handle uint256s.
+  @Transcode(Optional(VarBuffer))
+  unstakeAmountNanos: Buffer = Buffer.alloc(0);
+}
+
 export const TransactionTypeMetadataMap = {
   1: TransactionMetadataBlockReward,
   2: TransactionMetadataBasicTransfer,
@@ -656,6 +665,7 @@ export const TransactionTypeMetadataMap = {
   34: TransactionMetadataRegisterAsValidator,
   35: TransactionMetadataUnregisterAsValidator,
   36: TransactionMetadataStake,
+  37: TransactionMetadataUnstake,
 };
 
 export class Transaction extends BinaryRecord {