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ProvablePure,
Bool,
CircuitString,
provablePure,
Field,
method,
PublicKey,
SmartContract,
UInt64,
Account,
Permissions,
State,
state,
Experimental,
AccountUpdate,
TokenContract,
AccountUpdateForest,
} from 'o1js';
import { IERC20, IERC20Events, ERC20Events } from './Erc20Token.js';
import { OracleContract } from '../zkapp/OracleContract.js';
/**
* Represents the events emitted by an ERC677 token contract.
*
* Extends the standard ERC20 events with an additional `TransferAndCall` event.
* This event is used to signal a token transfer that also triggers a call to a
* specified contract method.
*
* @type {IERC20Events & { TransferAndCall: ProvablePure<TransferAndCallArgs> }}
*/
export type IERC677Events = IERC20Events & {
TransferAndCall: ProvablePure<{
from: PublicKey;
to: PublicKey;
value: UInt64;
data0: Field;
data1: Field;
data2: Field;
data3: Field;
}>;
};
/**
* Defines the structure of a TransferAndCall event, typically used in the context of an ERC677 token contract.
*
* @type {Object}
* @property {ProvablePure<TransferAndCallArgs>} TransferAndCall - A function that represents the event,
* ensuring its pure (no side effects) and provable.
*/
const TransferAndCallEvent = {
/**
* The TransferAndCall event function.
*
*/
TransferAndCall: provablePure({
/**
* The address of the sender.
*
* @type {PublicKey}
*/
from: PublicKey,
/**
* The address of the recipient.
*
* @type {PublicKey}
*/
to: PublicKey,
/**
* The amount of tokens transferred.
*
* @type {UInt64}
*/
value: UInt64,
data0: Field,
data1: Field,
data2: Field,
data3: Field,
}),
};
/**
* Exports an object containing all events emitted by an ERC677 token contract.
*
* Combines the standard ERC20 events with the `TransferAndCall` event, providing
* a comprehensive representation of token transfer activities and contract calls.
*
* @type {IERC677Events}
* @readonly
*/
export const ERC677Events: IERC677Events = {
...ERC20Events,
...TransferAndCallEvent,
};
/**
* Defines the interface for an ERC677 token contract.
*
* Extends the standard ERC20 interface with the additional `transferAndCall` method,
* enabling token transfers that also trigger contract calls.
*
* @abstract
* @extends {IERC20}
*/
export abstract class IERC677 extends IERC20 {
/**
* Transfers tokens to a recipient and calls a contract method.
*
* @param {PublicKey} to - The address of the recipient.
* @param {UInt64} value - The amount of tokens to transfer.
* @param {Field} data0 - The first additional field to be passed to the contract method, if applicable.
* @param {Field} data1 - The second additional field to be passed to the contract method, if applicable.
* @param {Field} data2 - The third additional field to be passed to the contract method, if applicable.
* @param {Field} data3 - The fourth additional field to be passed to the contract method, if applicable.
* @returns {Bool} - True if the transfer and call were successful, false otherwise.
* @emits Transfer - Emitted when the transfer is successful.
*/
abstract transferAndCall(
to: PublicKey,
value: UInt64,
data0: Field,
data1: Field,
data2: Field,
data3: Field
): Promise<void>; // emits "Transfer" event
/**
* The events emitted by the contract.
*
* @type {IERC677Events}
* @readonly
*/
events: IERC677Events;
}
/**
* Builds and returns an instance of an ERC677 token contract.
*
* @param {PublicKey} address - The contract address.
* @param {string} name - The token name.
* @param {string} symbol - The token symbol.
* @param {number} decimals - The number of decimals for token precision.
* @returns {Promise<SmartContract & IERC677>} - A promise that resolves to the constructed contract instance.
*/
export async function buildERC677Contract(
address: PublicKey,
name: string,
symbol: string,
decimals: number
): Promise<TokenContract & IERC677> {
/**
* Internal class representing the ERC677 contract implementation.
*/
class Erc677Contract extends TokenContract implements IERC677 {
/**
* Stores the total amount of tokens in circulation.
*
* @type {State<UInt64>}
*/
@state(UInt64) totalAmountInCirculation = State<UInt64>();
/**
* Deploys the contract to the blockchain and configures permissions.
*
* @remarks
* This method sets up proof-based permissions for sensitive actions.
*/
public async deploy() {
await super.deploy();
const permissionToEdit = Permissions.proof();
this.account.permissions.set({
...Permissions.default(),
editState: permissionToEdit,
setTokenSymbol: permissionToEdit,
send: permissionToEdit,
receive: permissionToEdit,
});
}
/**
* Initializes the contract after deployment.
*
* @remarks
* This method performs the following steps:
* 1. Calls the superclass's `init` method to handle any base initialization tasks.
* 2. Sets the token symbol for the contract.
* 3. Initializes the total amount of tokens in circulation to zero.
*/
init() {
super.init();
this.account.tokenSymbol.set(symbol);
this.totalAmountInCirculation.set(UInt64.zero);
}
@method async approveBase(forest: AccountUpdateForest) {
this.checkZeroBalanceChange(forest);
}
/**
* @returns The name of the token, as a CircuitString.
* @remarks
* This method adheres to the ERC677 standard for retrieving the token's name.
* It converts the stored string name into a CircuitString for compatibility with zkApp operations.
*/
name(): CircuitString {
return CircuitString.fromString(name);
}
/**
* @returns The symbol of the token, as a CircuitString.
* @remarks
* This method adheres to the ERC677 standard for retrieving the token's symbol.
* It converts the stored string symbol into a CircuitString for compatibility with zkApp operations.
*/
symbol(): CircuitString {
return CircuitString.fromString(symbol);
}
/**
* @returns The number of decimals used to represent token amounts, as a Field.
* @todo Should be UInt8 when available.
*/
decimals(): Field {
return Field(decimals);
}
/**
* @returns The total token supply, as a UInt64.
* @remarks
* This method accesses the `totalAmountInCirculation` state variable to provide the current token supply.
*/
totalSupply(): UInt64 {
return this.totalAmountInCirculation.get();
}
async balanceOf(owner: PublicKey | AccountUpdate): Promise<UInt64> {
let update =
owner instanceof PublicKey
? AccountUpdate.create(owner, this.deriveTokenId())
: owner;
await this.approveAccountUpdate(update);
return update.account.balance.getAndRequireEquals();
}
/**
* @param owner The address of the token owner.
* @param spender The address of the spender.
* @returns The amount of tokens approved for the spender, as a UInt64.
* @todo Implement allowance functionality to enable approved spending.
*/
allowance(owner: PublicKey, spender: PublicKey): UInt64 {
// TODO: implement allowances
return UInt64.zero;
}
/**
* Mints new tokens and assigns them to a receiver.
*
* @remarks
* This method assumes that authorization checks for minting are handled elsewhere.
* It directly performs the following steps:
* 1. Retrieves the current total supply of tokens in circulation.
* 2. Asserts consistency of the retrieved state value.
* 3. Calculates the new total supply after minting.
* 4. Calls the underlying token module to mint the new tokens.
* 5. Updates the total token supply in the contract's state.
*
* @param receiverAddress - The address of the receiver who will receive the newly minted tokens
* @param amount - The amount of tokens to mint
*/
@method async mint(receiverAddress: PublicKey, amount: UInt64) {
let totalAmountInCirculation = this.totalAmountInCirculation.get();
this.totalAmountInCirculation.requireEquals(totalAmountInCirculation);
// this.totalAmountInCirculation.assertEquals(totalAmountInCirculation);
let newTotalAmountInCirculation = totalAmountInCirculation.add(amount);
this.internal.mint({
address: receiverAddress,
amount,
});
this.totalAmountInCirculation.set(newTotalAmountInCirculation);
}
/**
* Burns (destroys) existing tokens, reducing the total supply.
*
* @remarks
* This method assumes that authorization checks for burning are handled elsewhere.
* It directly performs the following steps:
* 1. Retrieves the current total supply of tokens in circulation.
* 2. Asserts consistency of the retrieved state value.
* 3. Calculates the new total supply after burning.
* 4. Calls the underlying token module to burn the specified tokens.
* 5. Updates the total token supply in the contract's state.
*
* @param receiverAddress - The address of the token holder whose tokens will be burned
* @param amount - The amount of tokens to burn
*
* @warning This method does not explicitly check for authorization to burn tokens.
* It's essential to ensure that appropriate authorization mechanisms are in place
* to prevent unauthorized token burning.
*/
@method async burn(receiverAddress: PublicKey, amount: UInt64) {
let totalAmountInCirculation = this.totalAmountInCirculation.get();
this.totalAmountInCirculation.requireEquals(totalAmountInCirculation);
// this.totalAmountInCirculation.assertEquals(totalAmountInCirculation);
let newTotalAmountInCirculation = totalAmountInCirculation.sub(amount);
this.internal.burn({
address: receiverAddress,
amount,
});
this.totalAmountInCirculation.set(newTotalAmountInCirculation);
}
/**
* @method
* @param from The address to transfer tokens from.
* @param to The address to transfer tokens to.
* @param value The amount of tokens to transfer.
* @returns True if the transfer was successful, false otherwise.
* @emits Transfer
* @remarks
* Similar to `transfer()`, but allows transferring tokens from a specified address, often for approved spending.
* Also relies on the zkApp protocol for secure balance checks and emits a Transfer event.
*/
@method async transferFrom(from: PublicKey, to: PublicKey, value: UInt64) {
this.internal.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
}
/**
* @method
* @param spender The address to approve as a spender.
* @param value The amount of tokens to approve.
* @returns True if the approval was successful, false otherwise.
* @emits Approval
* @todo Implement allowance functionality to enable token approvals.
*/
@method async approveSpend(spender: PublicKey, value: UInt64) {
// TODO: implement allowances
}
/**
* Transfers tokens to a recipient and optionally calls a contract method.
*
* @param {PublicKey} to - The address of the recipient.
* @param {UInt64} value - The amount of tokens to transfer.
* @param data0 - The first additional field to be passed to the contract method, if applicable.
* @param data1 - The second additional field to be passed to the contract method, if applicable.
* @param data2 - The third additional field to be passed to the contract method, if applicable.
* @param data3 - The fourth additional field to be passed to the contract method, if applicable.
* @returns {Bool} - Returns `false` in the current implementation.
* @emits TransferAndCall - Emitted when the transfer is successful.
*/
@method async transferAndCall(
to: PublicKey,
value: UInt64,
data0: Field,
data1: Field,
data2: Field,
data3: Field
) {
this.internal.send({
from: this.sender.getAndRequireSignature(),
to,
amount: value,
});
// this.emitEvent('TransferAndCall', {
// from: this.sender.getAndRequireSignature(),
// to,
// value,
// data0,
// data1,
// data2,
// data3,
// });
const oracleContract = new OracleContract(to);
await oracleContract.oracleRequest(data0, data1, data2, data3);
// we don't have to check the balance of the sender -- this is done by the zkApp protocol
}
/**
* Events emitted by the contract.
*/
events = ERC677Events;
}
await Erc677Contract.compile(); // Compile
return new Erc677Contract(address);
}
export class SErc677Contract extends TokenContract implements IERC677 {
static staticSymbol = '';
static staticName = '';
static staticDecimals = 0;
/**
* Stores the total amount of tokens in circulation.
*
* @type {State<UInt64>}
*/
@state(UInt64) totalAmountInCirculation = State<UInt64>();
/**
* Deploys the contract to the blockchain and configures permissions.
*
* @remarks
* This method sets up proof-based permissions for sensitive actions.
*/
public async deploy() {
await super.deploy();
const permissionToEdit = Permissions.proof();
this.account.permissions.set({
...Permissions.default(),
editState: permissionToEdit,
setTokenSymbol: permissionToEdit,
send: permissionToEdit,
receive: permissionToEdit,
});
}
/**
* Initializes the contract after deployment.
*
* @remarks
* This method performs the following steps:
* 1. Calls the superclass's `init` method to handle any base initialization tasks.
* 2. Sets the token symbol for the contract.
* 3. Initializes the total amount of tokens in circulation to zero.
*/
init() {
super.init();
this.account.tokenSymbol.set(SErc677Contract.staticSymbol);
this.totalAmountInCirculation.set(UInt64.zero);
}
@method async approveBase(forest: AccountUpdateForest) {
this.checkZeroBalanceChange(forest);
}
/**
* @returns The name of the token, as a CircuitString.
* @remarks
* This method adheres to the ERC677 standard for retrieving the token's name.
* It converts the stored string name into a CircuitString for compatibility with zkApp operations.
*/
name(): CircuitString {
return CircuitString.fromString(SErc677Contract.staticName);
}
/**
* @returns The symbol of the token, as a CircuitString.
* @remarks
* This method adheres to the ERC677 standard for retrieving the token's symbol.
* It converts the stored string symbol into a CircuitString for compatibility with zkApp operations.
*/
symbol(): CircuitString {
return CircuitString.fromString(SErc677Contract.staticSymbol);
}
/**
* @returns The number of decimals used to represent token amounts, as a Field.
* @todo Should be UInt8 when available.
*/
decimals(): Field {
return Field(SErc677Contract.staticDecimals);
}
/**
* @returns The total token supply, as a UInt64.
* @remarks
* This method accesses the `totalAmountInCirculation` state variable to provide the current token supply.
*/
totalSupply(): UInt64 {
return this.totalAmountInCirculation.get();
}
async balanceOf(owner: PublicKey | AccountUpdate): Promise<UInt64> {
let update =
owner instanceof PublicKey
? AccountUpdate.create(owner, this.deriveTokenId())
: owner;
await this.approveAccountUpdate(update);
return update.account.balance.getAndRequireEquals();
}
/**
* @param owner The address of the token owner.
* @param spender The address of the spender.
* @returns The amount of tokens approved for the spender, as a UInt64.
* @todo Implement allowance functionality to enable approved spending.
*/
allowance(owner: PublicKey, spender: PublicKey): UInt64 {
// TODO: implement allowances
return UInt64.zero;
}
/**
* Mints new tokens and assigns them to a receiver.
*
* @remarks
* This method assumes that authorization checks for minting are handled elsewhere.
* It directly performs the following steps:
* 1. Retrieves the current total supply of tokens in circulation.
* 2. Asserts consistency of the retrieved state value.
* 3. Calculates the new total supply after minting.
* 4. Calls the underlying token module to mint the new tokens.
* 5. Updates the total token supply in the contract's state.
*
* @param receiverAddress - The address of the receiver who will receive the newly minted tokens
* @param amount - The amount of tokens to mint
*/
@method async mint(receiverAddress: PublicKey, amount: UInt64) {
let totalAmountInCirculation = this.totalAmountInCirculation.get();
this.totalAmountInCirculation.requireEquals(totalAmountInCirculation);
// this.totalAmountInCirculation.assertEquals(totalAmountInCirculation);
let newTotalAmountInCirculation = totalAmountInCirculation.add(amount);
this.internal.mint({
address: receiverAddress,
amount,
});
this.totalAmountInCirculation.set(newTotalAmountInCirculation);
}
/**
* Burns (destroys) existing tokens, reducing the total supply.
*
* @remarks
* This method assumes that authorization checks for burning are handled elsewhere.
* It directly performs the following steps:
* 1. Retrieves the current total supply of tokens in circulation.
* 2. Asserts consistency of the retrieved state value.
* 3. Calculates the new total supply after burning.
* 4. Calls the underlying token module to burn the specified tokens.
* 5. Updates the total token supply in the contract's state.
*
* @param receiverAddress - The address of the token holder whose tokens will be burned
* @param amount - The amount of tokens to burn
*
* @warning This method does not explicitly check for authorization to burn tokens.
* It's essential to ensure that appropriate authorization mechanisms are in place
* to prevent unauthorized token burning.
*/
@method async burn(receiverAddress: PublicKey, amount: UInt64) {
let totalAmountInCirculation = this.totalAmountInCirculation.get();
this.totalAmountInCirculation.requireEquals(totalAmountInCirculation);
// this.totalAmountInCirculation.assertEquals(totalAmountInCirculation);
let newTotalAmountInCirculation = totalAmountInCirculation.sub(amount);
this.internal.burn({
address: receiverAddress,
amount,
});
this.totalAmountInCirculation.set(newTotalAmountInCirculation);
}
/**
* @method
* @param from The address to transfer tokens from.
* @param to The address to transfer tokens to.
* @param value The amount of tokens to transfer.
* @returns True if the transfer was successful, false otherwise.
* @emits Transfer
* @remarks
* Similar to `transfer()`, but allows transferring tokens from a specified address, often for approved spending.
* Also relies on the zkApp protocol for secure balance checks and emits a Transfer event.
*/
@method async transferFrom(from: PublicKey, to: PublicKey, value: UInt64) {
this.internal.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
}
/**
* @method
* @param spender The address to approve as a spender.
* @param value The amount of tokens to approve.
* @returns True if the approval was successful, false otherwise.
* @emits Approval
* @todo Implement allowance functionality to enable token approvals.
*/
@method async approveSpend(spender: PublicKey, value: UInt64) {
// TODO: implement allowances
}
/**
* Transfers tokens to a recipient and optionally calls a contract method.
*
* @param {PublicKey} to - The address of the recipient.
* @param {UInt64} value - The amount of tokens to transfer.
* @param data0 - The first additional field to be passed to the contract method, if applicable.
* @param data1 - The second additional field to be passed to the contract method, if applicable.
* @param data2 - The third additional field to be passed to the contract method, if applicable.
* @param data3 - The fourth additional field to be passed to the contract method, if applicable.
* @returns {Bool} - Returns `false` in the current implementation.
* @emits TransferAndCall - Emitted when the transfer is successful.
*/
@method async transferAndCall(
to: PublicKey,
value: UInt64,
data0: Field,
data1: Field,
data2: Field,
data3: Field
) {
this.internal.send({
from: this.sender.getAndRequireSignature(),
to,
amount: value,
});
// this.emitEvent('TransferAndCall', {
// from: this.sender,
// to,
// value,
// data0,
// data1,
// data2,
// data3,
// });
const oracleContract = new OracleContract(to);
await oracleContract.oracleRequest(data0, data1, data2, data3);
// we don't have to check the balance of the sender -- this is done by the zkApp protocol
}
/**
* Events emitted by the contract.
*/
events = ERC677Events;
}
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