DTKERC20.cairo

%lang starknet

from starkware.cairo.common.cairo_builtins import HashBuiltin
from starkware.cairo.common.uint256 import Uint256
from starkware.starknet.common.syscalls import get_caller_address
from openzeppelin.token.erc20.library import ERC20

@constructor
func constructor{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    name: felt, symbol: felt, initial_supply: Uint256, recipient: felt
) {
    ERC20.initializer(name, symbol, 18);
    ERC20._mint(recipient, initial_supply);
    return ();
}

//
// Getters
//

@view
func name{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}() -> (name: felt) {
    let (name) = ERC20.name();
    return (name,);
}

@view
func symbol{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}() -> (symbol: felt) {
    let (symbol) = ERC20.symbol();
    return (symbol,);
}

@view
func totalSupply{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}() -> (
    totalSupply: Uint256
) {
    let (totalSupply: Uint256) = ERC20.total_supply();
    return (totalSupply,);
}

@view
func decimals{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}() -> (
    decimals: felt
) {
    let (decimals) = ERC20.decimals();
    return (decimals,);
}

@view
func balanceOf{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(account: felt) -> (
    balance: Uint256
) {
    let (balance: Uint256) = ERC20.balance_of(account);
    return (balance,);
}

@view
func allowance{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    owner: felt, spender: felt
) -> (remaining: Uint256) {
    let (remaining: Uint256) = ERC20.allowance(owner, spender);
    return (remaining,);
}

//
// Externals
//

@external
func faucet{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}() -> (success: felt) {
    let amount: Uint256 = Uint256(100 * 1000000000000000000, 0);
    let (caller) = get_caller_address();
    ERC20._mint(caller, amount);
    // Cairo equivalent to 'return (true)'
    return (1,);
}

@external
func transfer{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    recipient: felt, amount: Uint256
) -> (success: felt) {
    ERC20.transfer(recipient, amount);
    // Cairo equivalent to 'return (true)'
    return (1,);
}

@external
func transferFrom{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    sender: felt, recipient: felt, amount: Uint256
) -> (success: felt) {
    ERC20.transfer_from(sender, recipient, amount);
    // Cairo equivalent to 'return (true)'
    return (1,);
}

@external
func approve{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    spender: felt, amount: Uint256
) -> (success: felt) {
    ERC20.approve(spender, amount);
    // Cairo equivalent to 'return (true)'
    return (1,);
}

@external
func increaseAllowance{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    spender: felt, added_value: Uint256
) -> (success: felt) {
    ERC20.increase_allowance(spender, added_value);
    // Cairo equivalent to 'return (true)'
    return (1,);
}

@external
func decreaseAllowance{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    spender: felt, subtracted_value: Uint256
) -> (success: felt) {
    ERC20.decrease_allowance(spender, subtracted_value);
    // Cairo equivalent to 'return (true)'
    return (1,);
}