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Bool,
CircuitString,
Field,
PublicKey,
SmartContract,
UInt64,
ProvablePure,
provablePure,
Account,
method,Permissions,
VerificationKey,
AccountUpdate,
state,
State,
Experimental,
Int64,
Mina,
} from 'o1js';
import { Erc20 } from './Erc20Contract'
import { OracleContract } from './OracleContract';
/**
* ERC-677 token standard.
* https://github.com/ethereum/EIPs/issues/677
*/
export type Erc677 = Erc20 & {
transferAndCall(to: PublicKey, value: UInt64, data: CircuitString): Bool; // emits "Transfer" event
// events
events: {
TransferAndCall: ProvablePure<{
from: PublicKey;
to: PublicKey;
value: UInt64;
data: CircuitString;
}>;
};
};
export class Erc677Contract extends SmartContract implements Erc677 {
SUPPLY = UInt64.from(10n ** 18n);
@state(UInt64) totalAmountInCirculation = State<UInt64>();
/**
* This deploy method lets a another token account deploy their zkApp and verification key as a child of this token contract.
* This is important since we want the native token id of the deployed zkApp to be the token id of the token contract.
*/
@method deployZkapp(address: PublicKey, verificationKey: VerificationKey) {
let tokenId = this.token.id;
let zkapp = AccountUpdate.defaultAccountUpdate(address, tokenId);
this.approve(zkapp);
zkapp.account.permissions.set(Permissions.default());
zkapp.account.verificationKey.set(verificationKey);
zkapp.requireSignature();
}
init() {
super.init();
// mint the entire supply to the token account with the same address as this contract
let address = this.address;
let receiver = this.token.mint({
address,
amount: this.SUPPLY,
});
// assert that the receiving account is new, so this can be only done once
receiver.account.isNew.assertEquals(Bool(true));
// pay fees for opened account
this.balance.subInPlace(Mina.accountCreationFee());
this.totalAmountInCirculation.set(this.SUPPLY.sub(100_000_000));
// this.totalAmountInCirculation.set(UInt64.from(10n ** 18n));
// since this is the only method of this zkApp that resets the entire state, provedState: true implies
// that this function was run. Since it can be run only once, this implies it was run exactly once
// make account non-upgradable forever
this.account.permissions.set({
...Permissions.default(),
editState: Permissions.proofOrSignature(),
receive: Permissions.proof(),
access: Permissions.proofOrSignature(),
});
}
@method mint(receiverAddress: PublicKey, amount: UInt64) {
let totalAmountInCirculation = this.totalAmountInCirculation.get();
this.totalAmountInCirculation.assertEquals(totalAmountInCirculation);
let newTotalAmountInCirculation = totalAmountInCirculation.add(amount);
newTotalAmountInCirculation.value.assertLessThanOrEqual(
this.SUPPLY.value,
"Can't mint more than the total supply"
);
this.token.mint({
address: receiverAddress,
amount,
});
this.totalAmountInCirculation.set(newTotalAmountInCirculation);
}
@method burn(receiverAddress: PublicKey, amount: UInt64) {
let totalAmountInCirculation = this.totalAmountInCirculation.get();
this.totalAmountInCirculation.assertEquals(totalAmountInCirculation);
let newTotalAmountInCirculation = totalAmountInCirculation.sub(amount);
totalAmountInCirculation.value.assertGreaterThanOrEqual(
UInt64.from(0).value,
"Can't burn less than 0"
);
this.token.burn({
address: receiverAddress,
amount,
});
this.totalAmountInCirculation.set(newTotalAmountInCirculation);
}
@method approveTransferCallback(
senderAddress: PublicKey,
receiverAddress: PublicKey,
amount: UInt64,
callback: Experimental.Callback<any>
) {
let layout = AccountUpdate.Layout.NoChildren; // Allow only 1 accountUpdate with no children
let senderAccountUpdate = this.approve(callback, layout);
let negativeAmount = Int64.fromObject(
senderAccountUpdate.body.balanceChange
);
negativeAmount.assertEquals(Int64.from(amount).neg());
let tokenId = this.token.id;
senderAccountUpdate.body.tokenId.assertEquals(tokenId);
senderAccountUpdate.body.publicKey.assertEquals(senderAddress);
let receiverAccountUpdate = Experimental.createChildAccountUpdate(
this.self,
receiverAddress,
tokenId
);
receiverAccountUpdate.balance.addInPlace(amount);
}
@method transferFromZkapp(
from: PublicKey,
to: PublicKey,
value: UInt64,
approve: Experimental.Callback<any>
): Bool {
// TODO: need to be able to witness a certain layout of account updates, in this case
// tokenContract --> sender --> receiver
let fromUpdate = this.approve(approve, AccountUpdate.Layout.NoChildren);
let negativeAmount = Int64.fromObject(fromUpdate.body.balanceChange);
negativeAmount.assertEquals(Int64.from(value).neg());
let tokenId = this.token.id;
fromUpdate.body.tokenId.assertEquals(tokenId);
fromUpdate.body.publicKey.assertEquals(from);
let toUpdate = AccountUpdate.create(to, tokenId);
toUpdate.balance.addInPlace(value);
this.emitEvent('Transfer', { from, to, value });
return Bool(true);
}
// for letting a zkapp do whatever it wants, as long as no tokens are transfered
// TODO: atm, we have to restrict the zkapp to have no children
// -> need to be able to witness a general layout of account updates
@method approveZkapp(callback: Experimental.Callback<any>) {
let zkappUpdate = this.approve(callback, AccountUpdate.Layout.NoChildren);
Int64.fromObject(zkappUpdate.body.balanceChange).assertEquals(UInt64.zero);
}
// ERC20 API
name(): CircuitString {
return CircuitString.fromString('SomeCoin');
}
symbol(): CircuitString {
return CircuitString.fromString('SOM');
}
decimals(): Field {
return Field(9);
}
totalSupply(): UInt64 {
return this.SUPPLY;
}
balanceOf(owner: PublicKey): UInt64 {
let account = Account(owner, this.token.id);
let balance = account.balance.get();
account.balance.assertEquals(balance);
return balance;
}
allowance(owner: PublicKey, spender: PublicKey): UInt64 {
// TODO: implement allowances
return UInt64.zero;
}
@method transferAndCall(to: PublicKey, value: UInt64, data: CircuitString): Bool {
this.token.send({ from: this.sender, to, amount: value });
this.emitEvent('TransferAndCall', { from: this.sender, to, value, data });
const oracleContract = new OracleContract(to);
// oracleContract.onTokenTransfer(this.sender, value, data);
// we don't have to check the balance of the sender -- this is done by the zkApp protocol
return Bool(true);
}
@method transfer(to: PublicKey, value: UInt64): Bool {
this.token.send({ from: this.sender, to, amount: value });
this.emitEvent('Transfer', { from: this.sender, to, value });
// we don't have to check the balance of the sender -- this is done by the zkApp protocol
return Bool(true);
}
@method transferFrom(from: PublicKey, to: PublicKey, value: UInt64): Bool {
this.token.send({ from, to, amount: value });
this.emitEvent('Transfer', { from, to, value });
// we don't have to check the balance of the sender -- this is done by the zkApp protocol
return Bool(true);
}
@method approveSpend(spender: PublicKey, value: UInt64): Bool {
// TODO: implement allowances
return Bool(false);
}
events = {
TransferAndCall: provablePure({
from: PublicKey,
to: PublicKey,
value: UInt64,
data: CircuitString
}),
Transfer: provablePure({
from: PublicKey,
to: PublicKey,
value: UInt64,
}),
Approval: provablePure({
owner: PublicKey,
spender: PublicKey,
value: UInt64,
}),
};
} |