Add erc20 implementation

This commit is contained in:
Ladd Hoffman 2023-02-02 21:52:39 -06:00
parent d136e6ff45
commit 30ebe04db7
4 changed files with 158 additions and 4 deletions

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@ -0,0 +1,154 @@
/**
* Note: Copied from openzepplin-contracts/contracts/token/ERC20/ERC20.sol
* As of commit d59306b: Improve ERC20.decimals documentation (#3933)
* on 2023-02-02
* by Ladd Hoffman <laddhoffman@gmail.com>
*
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* The default value of {decimals} is 18. To change this, you should override
* this function so it returns a different value.
*
*
* ---
*
* This Javascript implementation is incomplete. It lacks the following:
* - allowance
* - transferFrom
* - approve
* - increaseAllowance
* - decreaseAllowance
* - _beforeTokenTransfer
* - _afterTokenTransfer
*/
export class ERC20 {
/**
* @dev Sets the values for {name} and {symbol}.
*
* All two of these values are immutable: they can only be set once during
* construction.
* @param {string} name
* @param {string} symbol
*/
constructor(name, symbol) {
this.name = name;
this.symbol = symbol;
this.totalSupply = 0;
this.balances = new Map(); // <address, number>
this.allowances = new Map(); // <address, number>
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the default value returned by this function, unless
* it's overridden.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
static decimals() {
return 18;
}
/**
* @dev See {IERC20-balanceOf}.
*/
balanceOf(account) {
return this.balances.get(account);
}
/**
* @dev See {IERC20-transfer}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
transfer(from, to, amount) {
if (!from) throw new Error('ERC20: transfer from the zero address');
if (!to) throw new Error('ERC20: transfer to the zero address');
// _beforeTokenTransfer(from, to, amount);
const fromBalance = this.balances.get(from);
if (fromBalance < amount) throw new Error('ERC20: transfer amount exceeds balance');
this.balances.set(from, fromBalance - amount);
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
this.balances.set(to, this.balances.get(to) + amount);
// emit Transfer(from, to, amount);
// _afterTokenTransfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
mint(account, amount) {
if (!account) throw new Error('ERC20: mint to the zero address');
// _beforeTokenTransfer(address(0), account, amount);
this.totalSupply += amount;
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
this.balances.set(account, this.balances.get(account) + amount);
// emit Transfer(address(0), account, amount);
// _afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
burn(account, amount) {
if (!account) throw new Error('ERC20: burn from the zero address');
// _beforeTokenTransfer(account, address(0), amount);
const accountBalance = this.balances.get(account);
if (accountBalance < amount) throw new Error('ERC20: burn amount exceeds balance');
this.balances.set(account, accountBalance - amount);
// Overflow not possible: amount <= accountBalance <= totalSupply.
this.totalSupply -= amount;
// emit Transfer(address(0), account, amount);
// _afterTokenTransfer(address(0), account, amount);
}
}

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@ -9,7 +9,7 @@
* - Emitting events * - Emitting events
*/ */
export class ERC721 /* is ERC165 */ { export class ERC721 {
constructor(name, symbol) { constructor(name, symbol) {
this.name = name; this.name = name;
this.symbol = symbol; this.symbol = symbol;
@ -59,7 +59,7 @@ export class ERC721 /* is ERC165 */ {
return owner; return owner;
} }
transferFrom(from, to, tokenId) { transfer(from, to, tokenId) {
const owner = this.owners.get(tokenId); const owner = this.owners.get(tokenId);
if (owner !== from) { if (owner !== from) {
throw new Error('ERC721: transfer from incorrect owner'); throw new Error('ERC721: transfer from incorrect owner');

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@ -84,7 +84,7 @@ export class Forum extends ReputationHolder {
} }
// Transfer ownership of the minted/staked token, from the posts to the post author // Transfer ownership of the minted/staked token, from the posts to the post author
this.dao.reputation.transferFrom(this.id, post.authorPublicKey, post.tokenId); this.dao.reputation.transfer(this.id, post.authorPublicKey, post.tokenId);
// const toActor = window?.scene?.findActor((actor) => actor.reputationPublicKey === post.authorPublicKey); // const toActor = window?.scene?.findActor((actor) => actor.reputationPublicKey === post.authorPublicKey);
// const value = this.dao.reputation.valueOf(post.tokenId); // const value = this.dao.reputation.valueOf(post.tokenId);
} }

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@ -259,7 +259,7 @@ export class ValidationPool extends ReputationHolder {
console.log(`sending reward for author stake to forum: ${this.dao.reputation.valueOf(this.tokenId)}`); console.log(`sending reward for author stake to forum: ${this.dao.reputation.valueOf(this.tokenId)}`);
// Transfer ownership of the minted token, from the pool to the forum // Transfer ownership of the minted token, from the pool to the forum
this.dao.reputation.transferFrom(this.id, this.dao.forum.id, this.tokenId); this.dao.reputation.transfer(this.id, this.dao.forum.id, this.tokenId);
// const value = this.dao.reputation.valueOf(this.tokenId); // const value = this.dao.reputation.valueOf(this.tokenId);
// this.actions.transfer.log(this, this.dao.forum, `(${value})`); // this.actions.transfer.log(this, this.dao.forum, `(${value})`);