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use solana_program::{
account_info::AccountInfo, entrypoint::ProgramResult, msg, program_error::ProgramError,
pubkey::Pubkey,
};
use std::str::from_utf8;
pub fn process_instruction(
_program_id: &Pubkey,
accounts: &[AccountInfo],
input: &[u8],
) -> ProgramResult {
let account_info_iter = &mut accounts.iter();
let mut missing_required_signature = false;
for account_info in account_info_iter {
if let Some(address) = account_info.signer_key() {
msg!("Signed by {:?}", address);
} else {
missing_required_signature = true;
}
}
if missing_required_signature {
return Err(ProgramError::MissingRequiredSignature);
}
let memo = from_utf8(input).map_err(|err| {
msg!("Invalid UTF-8, from byte {}", err.valid_up_to());
ProgramError::InvalidInstructionData
})?;
msg!("Memo (len {}): {:?}", memo.len(), memo);
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
use solana_program::{
account_info::IntoAccountInfo, program_error::ProgramError, pubkey::Pubkey,
};
use solana_sdk::account::Account;
#[test]
fn test_utf8_memo() {
let program_id = Pubkey::new(&[0; 32]);
let string = b"letters and such";
assert_eq!(Ok(()), process_instruction(&program_id, &[], string));
let emoji = "🐆".as_bytes();
let bytes = [0xF0, 0x9F, 0x90, 0x86];
assert_eq!(emoji, bytes);
assert_eq!(Ok(()), process_instruction(&program_id, &[], emoji));
let mut bad_utf8 = bytes;
bad_utf8[3] = 0xFF; assert_eq!(
Err(ProgramError::InvalidInstructionData),
process_instruction(&program_id, &[], &bad_utf8)
);
}
#[test]
fn test_signers() {
let program_id = Pubkey::new(&[0; 32]);
let memo = "🐆".as_bytes();
let pubkey0 = Pubkey::new_unique();
let pubkey1 = Pubkey::new_unique();
let pubkey2 = Pubkey::new_unique();
let mut account0 = Account::default();
let mut account1 = Account::default();
let mut account2 = Account::default();
let signed_account_infos = vec![
(&pubkey0, true, &mut account0).into_account_info(),
(&pubkey1, true, &mut account1).into_account_info(),
(&pubkey2, true, &mut account2).into_account_info(),
];
assert_eq!(
Ok(()),
process_instruction(&program_id, &signed_account_infos, memo)
);
assert_eq!(Ok(()), process_instruction(&program_id, &[], memo));
let unsigned_account_infos = vec![
(&pubkey0, false, &mut account0).into_account_info(),
(&pubkey1, false, &mut account1).into_account_info(),
(&pubkey2, false, &mut account2).into_account_info(),
];
assert_eq!(
Err(ProgramError::MissingRequiredSignature),
process_instruction(&program_id, &unsigned_account_infos, memo)
);
let partially_signed_account_infos = vec![
(&pubkey0, true, &mut account0).into_account_info(),
(&pubkey1, false, &mut account1).into_account_info(),
(&pubkey2, true, &mut account2).into_account_info(),
];
assert_eq!(
Err(ProgramError::MissingRequiredSignature),
process_instruction(&program_id, &partially_signed_account_infos, memo)
);
}
}