DCIPs/assets/eip-5773/contracts/utils/MultiAssetRenderUtils.sol

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// SPDX-License-Identifier: CC0-1.0
import "../IERC5773.sol";
pragma solidity ^0.8.15;
/**
* @dev Extra utility functions for composing RMRK assets.
*/
contract MultiAssetRenderUtils {
uint64 private constant _LOWEST_POSSIBLE_PRIORITY = 2 ** 16 - 1;
struct ActiveAsset {
uint64 id;
uint64 priority;
string metadata;
}
struct PendingAsset {
uint64 id;
uint128 acceptRejectIndex;
uint64 overwritesAssetWithId;
string metadata;
}
function getActiveAssets(
address target,
uint256 tokenId
) public view virtual returns (ActiveAsset[] memory) {
IERC5773 target_ = IERC5773(target);
uint64[] memory assets = target_.getActiveAssets(tokenId);
uint64[] memory priorities = target_.getActiveAssetPriorities(tokenId);
uint256 len = assets.length;
if (len == 0) {
revert("Token has no assets");
}
ActiveAsset[] memory activeAssets = new ActiveAsset[](len);
string memory metadata;
for (uint256 i; i < len; ) {
metadata = target_.getAssetMetadata(tokenId, assets[i]);
activeAssets[i] = ActiveAsset({
id: assets[i],
priority: priorities[i],
metadata: metadata
});
unchecked {
++i;
}
}
return activeAssets;
}
function getPendingAssets(
address target,
uint256 tokenId
) public view virtual returns (PendingAsset[] memory) {
IERC5773 target_ = IERC5773(target);
uint64[] memory assets = target_.getPendingAssets(tokenId);
uint256 len = assets.length;
if (len == 0) {
revert("Token has no assets");
}
PendingAsset[] memory pendingAssets = new PendingAsset[](len);
string memory metadata;
uint64 overwritesAssetWithId;
for (uint256 i; i < len; ) {
metadata = target_.getAssetMetadata(tokenId, assets[i]);
overwritesAssetWithId = target_.getAssetReplacements(
tokenId,
assets[i]
);
pendingAssets[i] = PendingAsset({
id: assets[i],
acceptRejectIndex: uint128(i),
overwritesAssetWithId: overwritesAssetWithId,
metadata: metadata
});
unchecked {
++i;
}
}
return pendingAssets;
}
/**
* @notice Returns asset metadata strings for the given ids
*
* Requirements:
*
* - `assetIds` must exist.
*/
function getAssetsById(
address target,
uint256 tokenId,
uint64[] calldata assetIds
) public view virtual returns (string[] memory) {
IERC5773 target_ = IERC5773(target);
uint256 len = assetIds.length;
string[] memory assets = new string[](len);
for (uint256 i; i < len; ) {
assets[i] = target_.getAssetMetadata(tokenId, assetIds[i]);
unchecked {
++i;
}
}
return assets;
}
/**
* @notice Returns the asset metadata with the highest priority for the given token
*/
function getTopAssetMetaForToken(
address target,
uint256 tokenId
) external view returns (string memory) {
IERC5773 target_ = IERC5773(target);
uint64[] memory priorities = target_.getActiveAssetPriorities(tokenId);
uint64[] memory assets = target_.getActiveAssets(tokenId);
uint256 len = priorities.length;
if (len == 0) {
revert("Token has no assets");
}
uint64 maxPriority = _LOWEST_POSSIBLE_PRIORITY;
uint64 maxPriorityAsset;
for (uint64 i; i < len; ) {
uint64 currentPrio = priorities[i];
if (currentPrio < maxPriority) {
maxPriority = currentPrio;
maxPriorityAsset = assets[i];
}
unchecked {
++i;
}
}
return target_.getAssetMetadata(tokenId, maxPriorityAsset);
}
}