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use {
crate::instructions::{write_bytes, UNINIT_BYTE},
core::slice::from_raw_parts,
pinocchio::{
address::MAX_SEED_LEN,
cpi::{invoke_signed, Signer},
error::ProgramError,
instruction::{InstructionAccount, InstructionView},
AccountView, Address, ProgramResult,
},
};
/// Assign account to a program based on a seed.
///
/// ### Accounts:
/// 0. `[WRITE]` Assigned account
/// 1. `[SIGNER]` Base account
pub struct AssignWithSeed<'a, 'b, 'c> {
/// Allocated account.
pub account: &'a AccountView,
/// Base account.
///
/// The account matching the base `Address` below must be provided as
/// a signer, but may be the same as the funding account and provided
/// as account 0.
pub base: &'a AccountView,
/// String of ASCII chars, no longer than [`MAX_SEED_LEN`](https://docs.rs/solana-address/latest/solana_address/constant.MAX_SEED_LEN.html).
pub seed: &'b str,
/// Address of program that will own the new account.
pub owner: &'c Address,
}
impl AssignWithSeed<'_, '_, '_> {
#[inline(always)]
pub fn invoke(&self) -> ProgramResult {
self.invoke_signed(&[])
}
#[inline(always)]
pub fn invoke_signed(&self, signers: &[Signer]) -> ProgramResult {
// Instruction accounts
let instruction_accounts: [InstructionAccount; 2] = [
InstructionAccount::writable(self.account.address()),
InstructionAccount::readonly_signer(self.base.address()),
];
if self.seed.len() > MAX_SEED_LEN {
return Err(ProgramError::InvalidInstructionData);
}
// instruction data
// - [0..4 ]: instruction discriminator
// - [4..36 ]: base address
// - [36..44]: seed length
// - [44.. ]: seed (max 32)
// - [.. +32]: owner address
let mut instruction_data = [UNINIT_BYTE; 108];
write_bytes(&mut instruction_data[..4], &[10, 0, 0, 0]);
write_bytes(&mut instruction_data[4..36], self.base.address().as_array());
write_bytes(
&mut instruction_data[36..44],
&u64::to_le_bytes(self.seed.len() as u64),
);
let offset = 44 + self.seed.len();
write_bytes(
// SAFETY: instruction data allocated `MAX_SEED_LEN` bytes for
// the seed.
unsafe { instruction_data.get_unchecked_mut(44..offset) },
self.seed.as_bytes(),
);
write_bytes(
// SAFETY: instruction data allocated space for the owner address
// after the seed.
unsafe { instruction_data.get_unchecked_mut(offset..offset + 32) },
self.owner.as_ref(),
);
let instruction = InstructionView {
program_id: &crate::ID,
accounts: &instruction_accounts,
// SAFETY: The instruction data is initialized.
data: unsafe { from_raw_parts(instruction_data.as_ptr() as *const _, offset + 32) },
};
invoke_signed(&instruction, &[self.account, self.base], signers)
}
}