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initializeAccount.ts
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initializeAccount.ts
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import { struct, u8 } from '@solana/buffer-layout';
import { AccountMeta, PublicKey, SYSVAR_RENT_PUBKEY, TransactionInstruction } from '@solana/web3.js';
import { TOKEN_PROGRAM_ID } from '../constants';
import {
TokenInvalidInstructionDataError,
TokenInvalidInstructionKeysError,
TokenInvalidInstructionProgramError,
TokenInvalidInstructionTypeError,
} from '../errors';
import { TokenInstruction } from './types';
/** TODO: docs */
export interface InitializeAccountInstructionData {
instruction: TokenInstruction.InitializeAccount;
}
/** TODO: docs */
export const initializeAccountInstructionData = struct<InitializeAccountInstructionData>([u8('instruction')]);
/**
* Construct an InitializeAccount instruction
*
* @param account New token account
* @param mint Mint account
* @param owner Owner of the new account
* @param programId SPL Token program account
*
* @return Instruction to add to a transaction
*/
export function createInitializeAccountInstruction(
account: PublicKey,
mint: PublicKey,
owner: PublicKey,
programId = TOKEN_PROGRAM_ID
): TransactionInstruction {
const keys = [
{ pubkey: account, isSigner: false, isWritable: true },
{ pubkey: mint, isSigner: false, isWritable: false },
{ pubkey: owner, isSigner: false, isWritable: false },
{ pubkey: SYSVAR_RENT_PUBKEY, isSigner: false, isWritable: false },
];
const data = Buffer.alloc(initializeAccountInstructionData.span);
initializeAccountInstructionData.encode({ instruction: TokenInstruction.InitializeAccount }, data);
return new TransactionInstruction({ keys, programId, data });
}
/** A decoded, valid InitializeAccount instruction */
export interface DecodedInitializeAccountInstruction {
programId: PublicKey;
keys: {
account: AccountMeta;
mint: AccountMeta;
owner: AccountMeta;
rent: AccountMeta;
};
data: {
instruction: TokenInstruction.InitializeAccount;
};
}
/**
* Decode an InitializeAccount instruction and validate it
*
* @param instruction Transaction instruction to decode
* @param programId SPL Token program account
*
* @return Decoded, valid instruction
*/
export function decodeInitializeAccountInstruction(
instruction: TransactionInstruction,
programId = TOKEN_PROGRAM_ID
): DecodedInitializeAccountInstruction {
if (!instruction.programId.equals(programId)) throw new TokenInvalidInstructionProgramError();
if (instruction.data.length !== initializeAccountInstructionData.span) throw new TokenInvalidInstructionDataError();
const {
keys: { account, mint, owner, rent },
data,
} = decodeInitializeAccountInstructionUnchecked(instruction);
if (data.instruction !== TokenInstruction.InitializeAccount) throw new TokenInvalidInstructionTypeError();
if (!account || !mint || !owner || !rent) throw new TokenInvalidInstructionKeysError();
// TODO: key checks?
return {
programId,
keys: {
account,
mint,
owner,
rent,
},
data,
};
}
/** A decoded, non-validated InitializeAccount instruction */
export interface DecodedInitializeAccountInstructionUnchecked {
programId: PublicKey;
keys: {
account: AccountMeta | undefined;
mint: AccountMeta | undefined;
owner: AccountMeta | undefined;
rent: AccountMeta | undefined;
};
data: {
instruction: number;
};
}
/**
* Decode an InitializeAccount instruction without validating it
*
* @param instruction Transaction instruction to decode
*
* @return Decoded, non-validated instruction
*/
export function decodeInitializeAccountInstructionUnchecked({
programId,
keys: [account, mint, owner, rent],
data,
}: TransactionInstruction): DecodedInitializeAccountInstructionUnchecked {
return {
programId,
keys: {
account,
mint,
owner,
rent,
},
data: initializeAccountInstructionData.decode(data),
};
}