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OnchainCID: Decentralized File Metadata & Ownership Management on Ethereum #1

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OnchainCID: Decentralized File Metadata & Ownership Management on Ethereum #1

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75 changes: 66 additions & 9 deletions contracts/OnchainCID.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -8,18 +8,26 @@ contract OnchainCID {
bool encryption;
string mimeType;
uint256[] dealIDs;
bool exists;
bool exists;
uint256 createdAt; // New field for creation timestamp
uint256 updatedAt; // New field for last update timestamp
}

// Mapping: user address => CID => FileMetadata
mapping(address => mapping(string => FileMetadata)) public files;

// Mapping to track pending ownership transfers
mapping(address => mapping(string => address)) public pendingTransfers;

event CIDAdded(address indexed user, string cid, string filename);
event DealIDUpdated(address indexed user, string cid, uint256 dealID);
event CIDAdded(address indexed user, string cid, string filename, uint256 timestamp);
event DealIDUpdated(address indexed user, string cid, uint256 dealID, uint256 timestamp);
event CIDRemoved(address indexed user, string cid);
event DealIDRemoved(address indexed user, string cid, uint256 dealID);
event MultipleDealsRemoved(address indexed user, string cid, uint256 count);
event OwnershipTransferInitiated(address indexed from, address indexed to, string cid);
event OwnershipTransferCompleted(address indexed from, address indexed to, string cid);
event OwnershipTransferCancelled(address indexed from, address indexed to, string cid);
event MetadataUpdated(address indexed user, string cid, uint256 timestamp);

// Function to push a new CID with its metadata
function pushCIDOnchain(
Expand All @@ -35,24 +43,30 @@ contract OnchainCID {
require(_size > 0, "Size must be greater than 0");
require(!files[msg.sender][_cid].exists, "CID already exists");

uint256 currentTime = block.timestamp;
files[msg.sender][_cid] = FileMetadata({
filename: _filename,
size: _size,
encryption: _encryption,
mimeType: _mimeType,
dealIDs: _dealIDs,
exists: true
exists: true,
createdAt: currentTime,
updatedAt: currentTime
});

emit CIDAdded(msg.sender, _cid, _filename);
emit CIDAdded(msg.sender, _cid, _filename, currentTime);
}

function updateDealID(string memory _cid, uint256[] memory _newDealIDs) public {
require(bytes(files[msg.sender][_cid].filename).length > 0, "CID does not exist");
require(files[msg.sender][_cid].exists, "CID does not exist");

uint256 currentTime = block.timestamp;
files[msg.sender][_cid].updatedAt = currentTime;

for (uint i = 0; i < _newDealIDs.length; i++) {
files[msg.sender][_cid].dealIDs.push(_newDealIDs[i]);
emit DealIDUpdated(msg.sender, _cid, _newDealIDs[i]);
emit DealIDUpdated(msg.sender, _cid, _newDealIDs[i], currentTime);
}
}

Expand All @@ -61,7 +75,9 @@ contract OnchainCID {
uint256 size,
bool encryption,
string memory mimeType,
uint256[] memory dealIDs
uint256[] memory dealIDs,
uint256 createdAt,
uint256 updatedAt
) {
FileMetadata memory file = files[_user][_cid];
require(file.exists, "CID does not exist");
Expand All @@ -71,10 +87,48 @@ contract OnchainCID {
file.size,
file.encryption,
file.mimeType,
file.dealIDs
file.dealIDs,
file.createdAt,
file.updatedAt
);
}

// Initiate file ownership transfer
function initiateOwnershipTransfer(string memory _cid, address _newOwner) public {
require(files[msg.sender][_cid].exists, "CID does not exist");
require(_newOwner != address(0), "Invalid new owner address");
require(_newOwner != msg.sender, "Cannot transfer to self");
require(pendingTransfers[msg.sender][_cid] == address(0), "Transfer already pending");

pendingTransfers[msg.sender][_cid] = _newOwner;
emit OwnershipTransferInitiated(msg.sender, _newOwner, _cid);
}

// Accept file ownership transfer
function acceptOwnershipTransfer(address _currentOwner, string memory _cid) public {
require(pendingTransfers[_currentOwner][_cid] == msg.sender, "No pending transfer");
require(files[_currentOwner][_cid].exists, "CID does not exist");

// Copy file metadata to new owner
FileMetadata memory fileData = files[_currentOwner][_cid];
fileData.updatedAt = block.timestamp;
files[msg.sender][_cid] = fileData;

// Remove file from current owner
delete files[_currentOwner][_cid];
delete pendingTransfers[_currentOwner][_cid];

emit OwnershipTransferCompleted(_currentOwner, msg.sender, _cid);
}

// Cancel a pending ownership transfer
function cancelOwnershipTransfer(string memory _cid) public {
require(pendingTransfers[msg.sender][_cid] != address(0), "No pending transfer");
address pendingOwner = pendingTransfers[msg.sender][_cid];
delete pendingTransfers[msg.sender][_cid];
emit OwnershipTransferCancelled(msg.sender, pendingOwner, _cid);
}

function removeDealID(string memory _cid, uint256 _dealID) public {
require(files[msg.sender][_cid].exists, "CID does not exist");
uint256[] storage deals = files[msg.sender][_cid].dealIDs;
Expand All @@ -83,6 +137,7 @@ contract OnchainCID {
if (deals[i] == _dealID) {
deals[i] = deals[deals.length - 1];
deals.pop();
files[msg.sender][_cid].updatedAt = block.timestamp;
emit DealIDRemoved(msg.sender, _cid, _dealID);
return;
}
Expand All @@ -92,6 +147,7 @@ contract OnchainCID {

function removeCID(string memory _cid) public {
require(files[msg.sender][_cid].exists, "CID does not exist");
require(pendingTransfers[msg.sender][_cid] == address(0), "Cannot remove file with pending transfer");
delete files[msg.sender][_cid];
emit CIDRemoved(msg.sender, _cid);
}
Expand All @@ -115,6 +171,7 @@ contract OnchainCID {
}

require(removedCount > 0, "No matching deal IDs found");
files[msg.sender][_cid].updatedAt = block.timestamp;
emit MultipleDealsRemoved(msg.sender, _cid, removedCount);
}
}