129 lines
3.2 KiB
Solidity
129 lines
3.2 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
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contract Contracts {
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mapping(bytes32=>bool) private ids; // contract id, equal to hash of bid
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mapping(bytes32=>uint) private durations; // contract duration in blocks
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mapping(bytes32=>uint) private sizes; // storage size in bytes
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mapping(bytes32=>bytes32) private contentHashes; // hash of data to be stored
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mapping(bytes32=>uint) private prices; // price in coins
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mapping(bytes32=>address) private hosts; // host that provides storage
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function _duration(bytes32 id) internal view returns (uint) {
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return durations[id];
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}
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function _size(bytes32 id) internal view returns (uint) {
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return sizes[id];
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}
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function _contentHash(bytes32 id) internal view returns (bytes32) {
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return contentHashes[id];
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}
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function _price(bytes32 id) internal view returns (uint) {
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return prices[id];
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}
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function _host(bytes32 id) internal view returns (address) {
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return hosts[id];
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}
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function _newContract(
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uint duration,
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uint size,
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bytes32 contentHash,
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uint proofPeriod,
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uint proofTimeout,
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bytes32 nonce,
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uint price,
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address host,
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uint bidExpiry,
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bytes memory requestSignature,
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bytes memory bidSignature
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)
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internal
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returns (bytes32 id)
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{
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bytes32 requestHash = _hashRequest(
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duration,
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size,
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contentHash,
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proofPeriod,
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proofTimeout,
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nonce
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);
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bytes32 bidHash = _hashBid(requestHash, bidExpiry, price);
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_checkSignature(requestSignature, requestHash, msg.sender);
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_checkSignature(bidSignature, bidHash, host);
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_checkBidExpiry(bidExpiry);
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_checkId(bidHash);
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id = bidHash;
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ids[id] = true;
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durations[id] = duration;
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sizes[id] = size;
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contentHashes[id] = contentHash;
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prices[id] = price;
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hosts[id] = host;
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}
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// Creates hash for a storage request that can be used to check its signature.
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function _hashRequest(
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uint duration,
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uint size,
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bytes32 hash,
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uint proofPeriod,
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uint proofTimeout,
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bytes32 nonce
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)
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private pure
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returns (bytes32)
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{
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return keccak256(abi.encodePacked(
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"[dagger.request.v1]",
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duration,
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size,
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hash,
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proofPeriod,
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proofTimeout,
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nonce
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));
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}
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// Creates hash for a storage bid that can be used to check its signature.
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function _hashBid(bytes32 requestHash, uint expiry, uint price)
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private pure
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returns (bytes32)
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{
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return keccak256(abi.encodePacked(
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"[dagger.bid.v1]",
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requestHash,
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expiry,
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price
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));
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}
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// Checks a signature for a storage request or bid, given its hash.
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function _checkSignature(bytes memory signature, bytes32 hash, address signer)
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private pure
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{
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bytes32 messageHash = ECDSA.toEthSignedMessageHash(hash);
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address recovered = ECDSA.recover(messageHash, signature);
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require(recovered == signer, "Invalid signature");
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}
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function _checkBidExpiry(uint expiry) private view {
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require(expiry > block.timestamp, "Bid expired");
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}
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function _checkId(bytes32 id) private view {
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require(
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!ids[id],
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"A contract with this id already exists"
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);
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}
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}
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