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mft.rs
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mft.rs
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use crate::*;
use near_contract_standards::fungible_token::metadata::FungibleTokenMetadata;
use near_sdk::{env, ext_contract, PromiseOrValue, assert_one_yocto, Gas, PromiseResult, log, Promise};
pub const STORAGE_BALANCE_MIN_BOUND: u128 = 1_250_000_000_000_000_000_000;
pub const NO_DEPOSIT: Balance = 0;
pub const TGAS: u64 = 1_000_000_000_000;
const GAS_FOR_RESOLVE_TRANSFER: Gas = Gas(10 * TGAS);
const GAS_FOR_MFT_TRANSFER_CALL: Gas = Gas(30 * TGAS);
pub(crate) fn parse_token_id(token_id: &String) -> String {
require!(token_id.starts_with(":"), "ILLEGAL_TOKEN_ID");
token_id[1..token_id.len()].to_string()
}
#[ext_contract(ext_self)]
trait MFTTokenResolver {
fn mft_resolve_transfer(
&mut self,
token_id: String,
sender_id: AccountId,
receiver_id: AccountId,
amount: U128,
) -> U128;
}
#[ext_contract(ext_mft_receiver)]
pub trait MFTTokenReceiver {
fn mft_on_transfer(
&mut self,
token_id: String,
sender_id: AccountId,
amount: U128,
msg: String,
) -> PromiseOrValue<U128>;
}
#[near_bindgen]
impl Contract {
#[payable]
pub fn mft_register(&mut self, token_id: String, account_id: AccountId) {
let amount = env::attached_deposit();
require!(amount >= STORAGE_BALANCE_MIN_BOUND, "ERR11_INSUFFICIENT_STORAGE");
let inner_id = parse_token_id(&token_id);
let mut token = self.tokens.get(&inner_id).expect("ERR_TOKEN_NOT_EXIST");
let refund = if token.accounts.contains_key(&account_id) {
amount
} else {
token.accounts.insert(&account_id, &0_u128);
self.tokens.insert(&inner_id, &token);
amount - STORAGE_BALANCE_MIN_BOUND
};
if refund > 0 {
Promise::new(env::predecessor_account_id()).transfer(refund);
}
}
/// with force is true, would burn all remaining balance in the account
#[payable]
pub fn mft_unregister(&mut self, token_id: String, force: Option<bool>) {
assert_one_yocto();
let account_id = env::predecessor_account_id();
let inner_id = parse_token_id(&token_id);
let force = force.unwrap_or(false);
let mut token = self.tokens.get(&inner_id).expect("ERR_TOKEN_NOT_EXIST");
if let Some(amount) = token.accounts.remove(&account_id) {
if !force {
require!(amount==0, "ERR_NON_ZERO_BALANCE");
}
token.total_supply -= amount;
self.tokens.insert(&inner_id, &token);
}
}
pub fn mft_balance_of(&self, token_id: String, account_id: AccountId) -> U128 {
let inner_id = parse_token_id(&token_id);
self.internal_mft_balance(&inner_id, &account_id).into()
}
pub fn mft_total_supply(&self, token_id: String) -> U128 {
let inner_id = parse_token_id(&token_id);
let token = self.tokens.get(&inner_id).unwrap_or_else(|| {
Token {
accounts: LookupMap::new(StorageKey::Accounts {
inner_id: inner_id.clone(),
}),
total_supply: 0,
}
});
token.total_supply.into()
}
pub fn mft_metadata(&self, token_id: String) -> FungibleTokenMetadata {
let inner_id = parse_token_id(&token_id);
FungibleTokenMetadata {
spec: "mft-1.0.0".to_string(),
name: format!("mock-mft-{}", inner_id),
symbol: format!("MOCK-MFT-{}", inner_id),
icon: None,
reference: None,
reference_hash: None,
decimals: self.decimals,
}
}
#[payable]
pub fn mft_transfer(
&mut self,
token_id: String,
receiver_id: AccountId,
amount: U128,
memo: Option<String>,
) {
assert_one_yocto();
let sender_id = env::predecessor_account_id();
let inner_id = parse_token_id(&token_id);
self.internal_mft_transfer(&inner_id, &sender_id, &receiver_id, amount.0, memo);
}
#[payable]
pub fn mft_transfer_call(
&mut self,
token_id: String,
receiver_id: AccountId,
amount: U128,
memo: Option<String>,
msg: String,
) -> PromiseOrValue<U128> {
assert_one_yocto();
let sender_id = env::predecessor_account_id();
let inner_id = parse_token_id(&token_id);
self.internal_mft_transfer(&inner_id, &sender_id, &receiver_id, amount.0, memo);
ext_mft_receiver::mft_on_transfer(
token_id.clone(),
sender_id.clone(),
amount,
msg,
receiver_id.clone(),
NO_DEPOSIT,
env::prepaid_gas() - GAS_FOR_MFT_TRANSFER_CALL - GAS_FOR_RESOLVE_TRANSFER,
)
.then(ext_self::mft_resolve_transfer(
token_id,
sender_id,
receiver_id,
amount,
env::current_account_id(),
NO_DEPOSIT,
GAS_FOR_RESOLVE_TRANSFER,
))
.into()
}
/// Returns how much was refunded back to the sender.
#[private]
pub fn mft_resolve_transfer(
&mut self,
token_id: String,
sender_id: AccountId,
receiver_id: AccountId,
amount: U128,
) -> U128 {
let unused_amount = match env::promise_result(0) {
PromiseResult::NotReady => unreachable!(),
PromiseResult::Successful(value) => {
if let Ok(unused_amount) = near_sdk::serde_json::from_slice::<U128>(&value) {
std::cmp::min(amount.0, unused_amount.0)
} else {
amount.0
}
}
PromiseResult::Failed => amount.0,
};
if unused_amount > 0 {
let inner_id = parse_token_id(&token_id);
let receiver_balance = self.internal_mft_balance(&inner_id, &receiver_id);
if receiver_balance > 0 {
let refund_amount = std::cmp::min(receiver_balance, unused_amount);
self.internal_mft_transfer(&inner_id, &receiver_id, &sender_id, refund_amount, None);
}
}
U128(unused_amount)
}
}
impl Contract {
fn internal_mft_balance(&self, inner_id: &String, account_id: &AccountId) -> u128 {
let token = self.tokens.get(&inner_id).expect("ERR_TOKEN_NOT_EXIST");
token.accounts.get(&account_id).unwrap_or_default()
}
fn internal_mft_transfer(&mut self, inner_id: &String, sender_id: &AccountId, receiver_id: &AccountId, amount: u128, memo: Option<String>) {
let mut token = self.tokens.get(&inner_id).expect("ERR_TOKEN_NOT_EXIST");
let prev_sender_amount = token.accounts.get(&sender_id).expect("ERR_SENDER_NOT_REGISTERED");
require!(prev_sender_amount >= amount, "NOT_ENOUGH_BALANCE");
let prev_receiver_amount = token.accounts.get(&receiver_id).expect("ERR_RECEIVER_NOT_REGISTERED");
token.accounts.insert(&sender_id, &(prev_sender_amount - amount));
token.accounts.insert(&receiver_id, &(prev_receiver_amount + amount));
self.tokens.insert(&inner_id, &token);
if let Some(content) = memo {
log!("mft_transfer memo: {}", content);
}
}
}