feat: added custom tx builder for sol

- added custom instruction builder for sol
- use new intent type solInstruction to build the tx in WP

TICKET: TMS-1218

Author: raj-bitgo

modules/bitgo/test/v2/unit/wallet.ts

@@ -1,12 +1,23 @@
 import { BaseCoin as CoinConfig } from '@bitgo/statics';
 import { BuildTransactionError, TransactionType } from '@bitgo/sdk-core';
-import { TransactionInstruction } from '@solana/web3.js';
+import { PublicKey } from '@solana/web3.js';
 import { Transaction } from './transaction';
 import { TransactionBuilder } from './transactionBuilder';
 import { InstructionBuilderTypes } from './constants';
 import { CustomInstruction } from './iface';
 import assert from 'assert';
 
+// Type alias for instruction parameters to make it cleaner
+type InstructionParams = {
+  programId: string;
+  keys: Array<{
+    pubkey: string;
+    isSigner: boolean;
+    isWritable: boolean;
+  }>;
+  data: string;
+};
+
 /**
  * Transaction builder for custom Solana instructions.
  * Allows building transactions with any set of raw Solana instructions.
@@ -19,7 +30,7 @@ export class CustomInstructionBuilder extends TransactionBuilder {
   }
 
   protected get transactionType(): TransactionType {
-    return TransactionType.Send;
+    return TransactionType.SolanaCustomInstructions;
   }
 
   /**
@@ -31,67 +42,44 @@ export class CustomInstructionBuilder extends TransactionBuilder {
     for (const instruction of this._instructionsData) {
       if (instruction.type === InstructionBuilderTypes.CustomInstruction) {
         const customInstruction = instruction as CustomInstruction;
-        this.addCustomInstruction(customInstruction.params.instruction);
+        this.addCustomInstruction(customInstruction.params);
       }
     }
   }
 
   /**
-   * Add a custom Solana instruction to the transaction
-   *
-   * @param instruction - The raw Solana TransactionInstruction
-   * @returns This transaction builder
+   * Add a custom instruction to the transaction
+   * @param instruction - The custom instruction to add
+   * @returns This builder instance
    */
-  addCustomInstruction(instruction: TransactionInstruction): this {
-    if (!instruction) {
-      throw new BuildTransactionError('Instruction cannot be null or undefined');
-    }
-
-    if (!instruction.programId) {
-      throw new BuildTransactionError('Instruction must have a valid programId');
-    }
-
-    if (!instruction.keys || !Array.isArray(instruction.keys)) {
-      throw new BuildTransactionError('Instruction must have valid keys array');
-    }
-
-    if (!instruction.data || !Buffer.isBuffer(instruction.data)) {
-      throw new BuildTransactionError('Instruction must have valid data buffer');
-    }
-
+  addCustomInstruction(instruction: InstructionParams): this {
+    this.validateInstruction(instruction);
     const customInstruction: CustomInstruction = {
       type: InstructionBuilderTypes.CustomInstruction,
-      params: {
-        instruction,
-      },
+      params: instruction,
     };
-
     this._customInstructions.push(customInstruction);
     return this;
   }
 
   /**
-   * Add multiple custom Solana instructions to the transaction
-   *
-   * @param instructions - Array of raw Solana TransactionInstructions
-   * @returns This transaction builder
+   * Add multiple custom instructions to the transaction
+   * @param instructions - Array of custom instructions to add
+   * @returns This builder instance
    */
-  addCustomInstructions(instructions: TransactionInstruction[]): this {
+  addCustomInstructions(instructions: InstructionParams[]): this {
     if (!Array.isArray(instructions)) {
       throw new BuildTransactionError('Instructions must be an array');
     }
-
     for (const instruction of instructions) {
       this.addCustomInstruction(instruction);
     }
-
     return this;
   }
 
   /**
    * Clear all custom instructions
-   *
-   * @returns This transaction builder
+   * @returns This builder instance
    */
   clearInstructions(): this {
     this._customInstructions = [];
@@ -100,13 +88,62 @@ export class CustomInstructionBuilder extends TransactionBuilder {
 
   /**
    * Get the current custom instructions
-   *
    * @returns Array of custom instructions
    */
   getInstructions(): CustomInstruction[] {
     return [...this._customInstructions];
   }
 
+  /**
+   * Validate custom instruction format
+   * @param instruction - The instruction to validate
+   */
+  private validateInstruction(instruction: InstructionParams): void {
+    if (!instruction) {
+      throw new BuildTransactionError('Instruction cannot be null or undefined');
+    }
+
+    if (!instruction.programId || typeof instruction.programId !== 'string') {
+      throw new BuildTransactionError('Instruction must have a valid programId string');
+    }
+
+    // Validate that programId is a valid Solana public key
+    try {
+      new PublicKey(instruction.programId);
+    } catch (error) {
+      throw new BuildTransactionError('Invalid programId format');
+    }
+
+    if (!instruction.keys || !Array.isArray(instruction.keys)) {
+      throw new BuildTransactionError('Instruction must have valid keys array');
+    }
+
+    // Validate each key
+    for (const key of instruction.keys) {
+      if (!key.pubkey || typeof key.pubkey !== 'string') {
+        throw new BuildTransactionError('Each key must have a valid pubkey string');
+      }
+
+      try {
+        new PublicKey(key.pubkey);
+      } catch (error) {
+        throw new BuildTransactionError('Invalid pubkey format in keys');
+      }
+
+      if (typeof key.isSigner !== 'boolean') {
+        throw new BuildTransactionError('Each key must have a boolean isSigner field');
+      }
+
+      if (typeof key.isWritable !== 'boolean') {
+        throw new BuildTransactionError('Each key must have a boolean isWritable field');
+      }
+    }
+
+    if (instruction.data === undefined || typeof instruction.data !== 'string') {
+      throw new BuildTransactionError('Instruction must have valid data string');
+    }
+  }
+
   /** @inheritdoc */
   protected async buildImplementation(): Promise<Transaction> {
     assert(this._customInstructions.length > 0, 'At least one custom instruction must be specified');

modules/sdk-coin-sol/src/lib/customInstructionBuilder.ts

@@ -1,12 +1,6 @@
 import { TransactionExplanation as BaseTransactionExplanation, Recipient } from '@bitgo/sdk-core';
 import { DecodedCloseAccountInstruction } from '@solana/spl-token';
-import {
-  Blockhash,
-  StakeInstructionType,
-  SystemInstructionType,
-  TransactionInstruction,
-  TransactionSignature,
-} from '@solana/web3.js';
+import { Blockhash, StakeInstructionType, SystemInstructionType, TransactionSignature } from '@solana/web3.js';
 import { InstructionBuilderTypes } from './constants';
 
 // TODO(STLX-9890): Add the interfaces for validityWindow and SequenceId
@@ -211,7 +205,13 @@ export type StakingDelegateParams = {
 export interface CustomInstruction {
   type: InstructionBuilderTypes.CustomInstruction;
   params: {
-    instruction: TransactionInstruction;
+    programId: string;
+    keys: Array<{
+      pubkey: string;
+      isSigner: boolean;
+      isWritable: boolean;
+    }>;
+    data: string;
   };
 }
 

modules/sdk-coin-sol/src/lib/iface.ts

@@ -45,6 +45,7 @@ import {
   Transfer,
   WalletInit,
   SetPriorityFee,
+  CustomInstruction,
 } from './iface';
 import { getInstructionType } from './utils';
 
@@ -83,6 +84,8 @@ export function instructionParamsFactory(
       return parseStakingAuthorizeRawInstructions(instructions);
     case TransactionType.StakingDelegate:
       return parseStakingDelegateInstructions(instructions);
+    case TransactionType.SolanaCustomInstructions:
+      return parseCustomInstructions(instructions, instructionMetadata);
     default:
       throw new NotSupported('Invalid transaction, transaction type not supported: ' + type);
   }
@@ -918,6 +921,50 @@ function parseStakingAuthorizeRawInstructions(instructions: TransactionInstructi
   return instructionData;
 }
 
+/**
+ * Parses Solana instructions to custom instruction params
+ *
+ * @param {TransactionInstruction[]} instructions - containing custom solana instructions
+ * @param {InstructionParams[]} instructionMetadata - the instruction metadata for the transaction
+ * @returns {InstructionParams[]} An array containing instruction params for custom instructions
+ */
+function parseCustomInstructions(
+  instructions: TransactionInstruction[],
+  instructionMetadata?: InstructionParams[]
+): CustomInstruction[] {
+  const instructionData: CustomInstruction[] = [];
+
+  for (let i = 0; i < instructions.length; i++) {
+    const instruction = instructions[i];
+
+    // Check if we have metadata for this instruction position
+    if (
+      instructionMetadata &&
+      instructionMetadata[i] &&
+      instructionMetadata[i].type === InstructionBuilderTypes.CustomInstruction
+    ) {
+      instructionData.push(instructionMetadata[i] as CustomInstruction);
+    } else {
+      // Convert the raw instruction to CustomInstruction format
+      const customInstruction: CustomInstruction = {
+        type: InstructionBuilderTypes.CustomInstruction,
+        params: {
+          programId: instruction.programId.toString(),
+          keys: instruction.keys.map((key) => ({
+            pubkey: key.pubkey.toString(),
+            isSigner: key.isSigner,
+            isWritable: key.isWritable,
+          })),
+          data: instruction.data.toString('base64'),
+        },
+      };
+      instructionData.push(customInstruction);
+    }
+  }
+
+  return instructionData;
+}
+
 function findTokenName(
   mintAddress: string,
   instructionMetadata?: InstructionParams[],

modules/sdk-coin-sol/src/lib/instructionParamsFactory.ts

@@ -40,7 +40,7 @@ import {
   SetPriorityFee,
   CustomInstruction,
 } from './iface';
-import { getSolTokenFromTokenName } from './utils';
+import { getSolTokenFromTokenName, isValidBase64, isValidHex } from './utils';
 
 /**
  * Construct Solana instructions from instructions params
@@ -551,15 +551,40 @@ function burnInstruction(data: Burn): TransactionInstruction[] {
 }
 
 /**
- * Process custom instruction - simply returns the raw instruction
+ * Process custom instruction - converts to TransactionInstruction
+ * Handles conversion from string-based format to TransactionInstruction format
  *
  * @param {CustomInstruction} data - the data containing the custom instruction
  * @returns {TransactionInstruction[]} An array containing the custom instruction
  */
 function customInstruction(data: InstructionParams): TransactionInstruction[] {
-  const {
-    params: { instruction },
-  } = data as CustomInstruction;
-  assert(instruction, 'Missing instruction param');
-  return [instruction];
+  const { params } = data as CustomInstruction;
+  assert(params.programId, 'Missing programId in custom instruction');
+  assert(params.keys && Array.isArray(params.keys), 'Missing or invalid keys in custom instruction');
+  assert(params.data !== undefined, 'Missing data in custom instruction');
+
+  // Convert string data to Buffer
+  let dataBuffer: Buffer;
+
+  if (isValidBase64(params.data)) {
+    dataBuffer = Buffer.from(params.data, 'base64');
+  } else if (isValidHex(params.data)) {
+    dataBuffer = Buffer.from(params.data, 'hex');
+  } else {
+    // Fallback to UTF-8
+    dataBuffer = Buffer.from(params.data, 'utf8');
+  }
+
+  // Create a new TransactionInstruction with the converted data
+  const convertedInstruction = new TransactionInstruction({
+    programId: new PublicKey(params.programId),
+    keys: params.keys.map((key) => ({
+      pubkey: new PublicKey(key.pubkey),
+      isSigner: key.isSigner,
+      isWritable: key.isWritable,
+    })),
+    data: dataBuffer,
+  });
+
+  return [convertedInstruction];
 }

modules/sdk-coin-sol/src/lib/solInstructionFactory.ts

@@ -235,6 +235,9 @@ export class Transaction extends BaseTransaction {
         case TransactionType.StakingDelegate:
           this.setTransactionType(TransactionType.StakingDelegate);
           break;
+        case TransactionType.SolanaCustomInstructions:
+          this.setTransactionType(TransactionType.SolanaCustomInstructions);
+          break;
       }
       if (transactionType !== TransactionType.StakingAuthorizeRaw) {
         this.loadInputsAndOutputs();
@@ -398,6 +401,8 @@ export class Transaction extends BaseTransaction {
           break;
         case InstructionBuilderTypes.SetPriorityFee:
           break;
+        case InstructionBuilderTypes.CustomInstruction:
+          break;
       }
     }
     this._outputs = outputs;
@@ -473,6 +478,9 @@ export class Transaction extends BaseTransaction {
           break;
         case InstructionBuilderTypes.CreateAssociatedTokenAccount:
           break;
+        case InstructionBuilderTypes.CustomInstruction:
+          // Custom instructions are arbitrary and cannot be explained
+          break;
         default:
           continue;
       }

modules/sdk-coin-sol/src/lib/transaction.ts

@@ -144,6 +144,29 @@ export function isValidMemo(memo: string): boolean {
   return Buffer.from(memo).length <= MAX_MEMO_LENGTH;
 }
 
+/**
+ * Checks if a string is valid base64 encoded data
+ * @param str - The string to validate
+ * @returns True if the string is valid base64, false otherwise
+ */
+export function isValidBase64(str: string): boolean {
+  try {
+    const decoded = Buffer.from(str, 'base64').toString('base64');
+    return decoded === str;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Checks if a string is valid hexadecimal data
+ * @param str - The string to validate
+ * @returns True if the string is valid hex, false otherwise
+ */
+export function isValidHex(str: string): boolean {
+  return /^[0-9A-Fa-f]*$/.test(str) && str.length % 2 === 0;
+}
+
 /**
  * Checks if raw transaction can be deserialized
  *