use {
crate::{common, fund_info::FundInfo, user_info::UserInfo},
solana_farm_sdk::{
fund::{Fund, FundUserRequests},
math,
program::{account, pda},
string::ArrayString64,
token::Token,
traits::Packed,
},
solana_program::{
account_info::AccountInfo, entrypoint::ProgramResult, msg, program_error::ProgramError,
},
};
pub fn approve_withdrawal(fund: &Fund, accounts: &[AccountInfo], amount: u64) -> ProgramResult {
#[allow(clippy::deprecated_cfg_attr)]
#[cfg_attr(rustfmt, rustfmt_skip)]
if let [
_admin_account,
fund_metadata,
fund_info_account,
_multisig_account,
fund_authority,
_spl_token_program,
fund_token_mint,
user_account,
user_info_account,
user_requests_account,
user_withdrawal_token_account,
user_fund_token_account,
custody_account,
custody_fees_account,
custody_metadata,
custody_token_metadata,
oracle_account
] = accounts
{
msg!("Validate state and accounts");
let mut fund_info = FundInfo::new(fund_info_account);
if fund_info.get_liquidation_start_time()? > 0 {
msg!("Error: Fund is in liquidation state");
return Err(ProgramError::Custom(516));
}
if fund_authority.key != &fund.fund_authority {
msg!("Error: Invalid Fund authority account");
return Err(ProgramError::Custom(517));
}
if !UserInfo::validate_account(fund, user_info_account, user_account.key) {
msg!("Error: Invalid user info account");
return Err(ProgramError::Custom(140));
}
if !account::check_token_account_owner(user_withdrawal_token_account, user_account.key)? {
msg!("Error: Invalid withdrawal destination account owner");
return Err(ProgramError::IllegalOwner);
}
common::check_fund_token_mint(fund, fund_token_mint)?;
let custody_token = account::unpack::<Token>(custody_token_metadata, "custody token")?;
common::check_wd_custody_accounts(
&fund.fund_program_id,
fund_metadata.key,
&custody_token,
custody_token_metadata,
user_withdrawal_token_account,
custody_account,
custody_fees_account,
custody_metadata,
oracle_account,
)?;
let mut user_requests =
account::unpack::<FundUserRequests>(user_requests_account, "user requests")?;
common::check_user_requests_account(
fund,
&custody_token,
&user_requests,
user_account,
user_requests_account,
)?;
if user_requests.withdrawal_request.amount == 0 {
msg!("Error: No pending withdrawals found");
return Err(ProgramError::Custom(526));
}
msg!("Compute withdrawal amount");
let amount_with_fee = if amount == 0 {
user_requests.withdrawal_request.amount
} else {
std::cmp::min(amount, user_requests.withdrawal_request.amount)
};
let mut user_info = UserInfo::new(user_info_account);
let user_fund_token_balance =
common::get_fund_token_balance(user_fund_token_account, &user_info)?;
if amount_with_fee == 0 || amount_with_fee > user_fund_token_balance {
msg!("Error: Insufficient user funds");
return Err(ProgramError::InsufficientFunds);
}
common::check_assets_update_time(
fund_info.get_assets_update_time()?,
fund_info.get_assets_max_update_age_sec()?,
)?;
msg!("Compute assets value. amount_with_fee: {}", amount_with_fee);
let ft_supply_amount = common::get_fund_token_supply(fund_token_mint, &fund_info)?;
if amount_with_fee > ft_supply_amount {
msg!("Error: Insufficient Fund supply amount");
return Err(ProgramError::InsufficientFunds);
}
let withdrawal_value_usd =
fund_info.get_current_assets_usd()? * amount_with_fee as f64 / ft_supply_amount as f64;
msg!(
"Compute tokens to transfer. withdrawal_value_usd: {}",
withdrawal_value_usd
);
let tokens_to_remove = account::get_asset_value_tokens(
withdrawal_value_usd,
custody_token.decimals,
custody_token.oracle_type,
oracle_account,
fund_info.get_assets_max_price_error()?,
fund_info.get_assets_max_price_age_sec()?,
)?;
let fund_fee = fund_info.get_withdrawal_fee()?;
let (fee_numerator, fee_denominator) = math::get_fee_parts(fund_fee);
let fee_tokens = math::checked_as_u64(math::checked_div(
math::checked_mul(tokens_to_remove as u128, fee_numerator as u128)?,
fee_denominator as u128,
)?)?;
let tokens_to_tranfer = math::checked_sub(tokens_to_remove, fee_tokens)?;
if tokens_to_tranfer == 0 {
msg!("Error: Withdrawal amount is too small");
return Err(ProgramError::InsufficientFunds);
}
if tokens_to_remove > account::get_token_balance(custody_account)? {
msg!("Error: Withdrawal for this amount couldn't be completed at this time. Contact Fund administrator.");
return Err(ProgramError::InsufficientFunds);
}
msg!(
"Transfer tokens to user wallet. tokens_to_tranfer: {}, fee_tokens: {}",
tokens_to_tranfer,
fee_tokens,
);
let seeds: &[&[&[u8]]] = &[&[
b"fund_authority",
fund.name.as_bytes(),
&[fund.authority_bump],
]];
pda::transfer_tokens_with_seeds(
custody_account,
user_withdrawal_token_account,
fund_authority,
seeds,
tokens_to_tranfer,
)?;
if fee_tokens > 0 {
pda::transfer_tokens_with_seeds(
custody_account,
custody_fees_account,
fund_authority,
seeds,
fee_tokens,
)?;
}
msg!(
"Burn Fund tokens from the user. amount_with_fee {}",
amount_with_fee
);
let (amount_to_burn, amount_to_reduce) = if fund_info.get_issue_virtual_tokens()? {
let token_balance = account::get_token_balance(user_fund_token_account)?;
let amount_to_burn = std::cmp::min(amount_with_fee, token_balance);
let amount_to_reduce = math::checked_sub(amount_with_fee, amount_to_burn)?;
(amount_to_burn, amount_to_reduce)
} else {
let amount_to_reduce =
std::cmp::min(amount_with_fee, user_info.get_virtual_tokens_balance()?);
let amount_to_burn = math::checked_sub(amount_with_fee, amount_to_reduce)?;
(amount_to_burn, amount_to_reduce)
};
pda::burn_tokens_with_seeds(
user_fund_token_account,
fund_token_mint,
fund_authority,
seeds,
amount_to_burn,
)?;
user_info.set_virtual_tokens_balance(math::checked_sub(
user_info.get_virtual_tokens_balance()?,
amount_to_reduce,
)?)?;
fund_info.set_virtual_tokens_supply(math::checked_sub(
fund_info.get_virtual_tokens_supply()?,
amount_to_reduce,
)?)?;
msg!("Update Fund stats");
let current_assets_usd = fund_info.get_current_assets_usd()?;
let new_assets = if current_assets_usd > withdrawal_value_usd {
current_assets_usd - withdrawal_value_usd
} else {
0.0
};
fund_info
.set_amount_removed_usd(fund_info.get_amount_removed_usd()? + withdrawal_value_usd)?;
fund_info.set_current_assets_usd(new_assets)?;
msg!("Update user stats");
user_requests.last_withdrawal.time = user_requests.withdrawal_request.time;
user_requests.last_withdrawal.amount = amount_with_fee;
user_requests.withdrawal_request.time = 0;
user_requests.withdrawal_request.amount = 0;
user_requests.deny_reason = ArrayString64::default();
user_requests.pack(*user_requests_account.try_borrow_mut_data()?)?;
Ok(())
} else {
Err(ProgramError::NotEnoughAccountKeys)
}
}