Add transcoder for stake transaction metadata. Add support for approve component for this new txn type.

Author: Lazy Nina

src/app/approve/approve.component.ts

@@ -39,6 +39,7 @@ import {
   TransactionSpendingLimit,
   TransactionMetadataRegisterAsValidator,
   TransactionMetadataUnregisterAsValidator,
+  TransactionMetadataStake,
 } from '../../lib/deso/transaction';
 import { ExtraData } from '../../types/identity';
 import { AccountService } from '../account.service';
@@ -597,6 +598,18 @@ export class ApproveComponent implements OnInit {
       case TransactionMetadataUnregisterAsValidator:
         description = 'unregister as a validator';
         break;
+      case TransactionMetadataStake:
+        const stakeMetadata = this.transaction
+          .metadata as TransactionMetadataStake;
+        const stakeValidatorPublicKey = this.base58KeyCheck(
+          stakeMetadata.validatorPublicKey
+        );
+        publicKeys = [stakeValidatorPublicKey];
+        const stakeAmountNanos = this.hexNanosToUnitString(
+          stakeMetadata.stakeAmountNanos
+        );
+        description = `stake ${stakeAmountNanos} $DESO to ${stakeValidatorPublicKey}`;
+        break;
     }
 
     // Set the transaction description based on the description populated with public keys.
@@ -617,6 +630,8 @@ export class ApproveComponent implements OnInit {
     return bs58check.encode(Buffer.from([...prefix, ...keyBytes]));
   }
 
+  // TODO: create hexBaseUnitsToUnitString function to support proper
+  // DAO Coin base unit conversions.
   hexNanosToUnitString(nanos: Buffer): string {
     return this.nanosToUnitString(parseInt(nanos.toString('hex'), 16));
   }

src/app/identity.service.ts

@@ -37,6 +37,7 @@ import {
   TransactionMetadataUpdateProfile,
   TransactionMetadataRegisterAsValidator,
   TransactionMetadataUnregisterAsValidator,
+  TransactionMetadataStake,
 } from '../lib/deso/transaction';
 import { SwalHelper } from '../lib/helpers/swal-helper';
 import { AccessLevel, PublicUserInfo } from '../types/identity';
@@ -522,6 +523,7 @@ export class IdentityService {
       case TransactionMetadataDAOCoinLimitOrder:
       case TransactionMetadataRegisterAsValidator:
       case TransactionMetadataUnregisterAsValidator:
+      case TransactionMetadataStake:
         return AccessLevel.Full;
 
       case TransactionMetadataFollow:

src/lib/deso/transaction.ts

@@ -609,6 +609,18 @@ export class TransactionMetadataRegisterAsValidator extends TransactionMetadata
 
 export class TransactionMetadataUnregisterAsValidator extends TransactionMetadata {}
 
+export class TransactionMetadataStake extends TransactionMetadata {
+  @Transcode(VarBuffer)
+  validatorPublicKey: Buffer = Buffer.alloc(0);
+
+  @Transcode(Uint8)
+  rewardMethod: number = 0;
+
+  // TODO: We may want a better way to handle uint256s.
+  @Transcode(Optional(VarBuffer))
+  stakeAmountNanos: Buffer = Buffer.alloc(0);
+}
+
 export const TransactionTypeMetadataMap = {
   1: TransactionMetadataBlockReward,
   2: TransactionMetadataBasicTransfer,
@@ -644,6 +656,7 @@ export const TransactionTypeMetadataMap = {
   33: TransactionMetadataNewMessage,
   34: TransactionMetadataRegisterAsValidator,
   35: TransactionMetadataUnregisterAsValidator,
+  36: TransactionMetadataStake,
 };
 
 export class Transaction extends BinaryRecord {