60 lines
1.5 KiB
Solidity
60 lines
1.5 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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contract Marketplace {
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IERC20 public immutable token;
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MarketplaceFunds private funds;
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mapping(bytes32 => Request) private requests;
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constructor(IERC20 _token) marketplaceInvariant {
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token = _token;
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}
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function transferFrom(address sender, uint256 amount) private {
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address receiver = address(this);
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require(token.transferFrom(sender, receiver, amount), "Transfer failed");
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}
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function requestStorage(Request calldata request)
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public
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marketplaceInvariant
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{
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bytes32 id = keccak256(abi.encode(request));
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require(request.size > 0, "Invalid size");
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require(requests[id].size == 0, "Request already exists");
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requests[id] = request;
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transferFrom(msg.sender, request.maxPrice);
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funds.received += request.maxPrice;
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funds.balance += request.maxPrice;
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emit StorageRequested(id, request);
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}
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struct Request {
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uint256 duration;
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uint256 size;
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bytes32 contentHash;
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uint256 proofPeriod;
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uint256 proofTimeout;
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uint256 maxPrice;
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bytes32 nonce;
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}
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event StorageRequested(bytes32 id, Request request);
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modifier marketplaceInvariant() {
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MarketplaceFunds memory oldFunds = funds;
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_;
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assert(funds.received >= oldFunds.received);
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assert(funds.sent >= oldFunds.sent);
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assert(funds.received == funds.balance + funds.sent);
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}
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struct MarketplaceFunds {
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uint256 balance;
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uint256 received;
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uint256 sent;
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}
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}
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