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Converting AccountInfo to UncheckedAccount in Anchor

When working with Anchor, you often need to perform operations that require access to the underlying account data. However, AccountInfo is a low-level type that provides a lot of information about the current state of the account. In some cases, you may want to convert it to UncheckedAccount, which offers more convenience and security features.

In this article, we will explore how to achieve this conversion in Anchor.

Prerequisites

Before diving into the code, make sure you have the following dependencies installed:

• anchor_lang: The official Anchor framework

• anchor_spl: Solana SDK for Anchor

You can add the following dependencies to your Cargo.toml file:

[dependencies]
anchor-lang = "0.1.6"
anchor-spl = "0.31.8"

Conversion Code

Here is an example of how you can convert AccountInfo to UncheckedAccount in Anchor:

use anchor_lang::prelude::*;

[ fetch ( accounts , clone )]
pub struct AccountInfoToUncheckedAccount( );
PubKey: Signature,
#[account(
has_one = owner,
required = true,
list = accounts,
)]
UncheckedAccount: Unchecked Account,
);
impl AccountInfoToUncheckedAccount { { AccountInfoToUncheckedAccount { .
fn get_unchecked_account(&self) -> UncheckedAccount {
self.0.to_unchecked_account()
} }
} }
pub fn account_info_toUnchecked(
info: AccountInfo,
program_token: program ID,
accounts: &BTreeMap,
): Result < UncheckedAccount , ProgramError > { .
// Create an instruction to convert account information
let instruction = Instruction::new(
"convert_account_info".
&[info.pubkey],
[
AccountInfoToUncheckedAccount {
pubkey: info.pubkey,
#[account(
has_one = owner,
required = true,
list = accounts,
)]
unchecked_account: info.get_unchecked_account(),
},
],
);
// Create a new account program
let new_program_id = ProgramId::new("my_new_program", "new_program");
// Execute the local blockchain instruction
if let Err(err) = anchor_lang::Program::new(program_id, instruction)?;
if !err.is_ok() { !
return Err ( err ) ;
} }
// Returns the program ID of the new account
OK ( new_program_id . into ())
} }

Explanation

In this code example, we create a structure AccountInfoToUncheckedAccount with a single field representing the owner of the original account. We then use the get_unchecked_account method to retrieve the underlying UncheckedAccount instance.

The account_info_tounchecked_account function takes an AccountInfo map, token_program, and accounts as input. It creates an instruction to transform the account information using the Instruction::new function, which returns a new instruction that can be executed on the local blockchain.

The instruction is then created by passing in the original account information, the token program ID, and the UncheckedAccount instance that we want to retrieve. Finally, we execute the instruction on the local blockchain using the anchor_lang::Program::new function. If the execution fails, we return an error; otherwise, we return the new account program ID.