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Removed receiverData and onReceive callback from ERC721 proxy.

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This commit is contained in:
Greg Hysen
2018-07-13 14:13:16 -07:00
parent e2fb49a8f8
commit 9f74feb347
3 changed files with 25 additions and 178 deletions
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94
packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol vendored
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@@ -83,19 +83,15 @@ contract ERC721Proxy is
// WARNING: The ABIv2 specification allows additional padding between
// the Params and Data section. This will result in a larger
// offset to assetData.
// Asset data itself is encoded as follows:
//
// | Area | Offset | Length | Contents |
// |----------|--------|---------|-------------------------------------|
// | Header | 0 | 4 | function selector |
// | Params | | 3 * 32 | function parameters: |
// | Params | | 2 * 32 | function parameters: |
// | | 4 | 12 + 20 | 1. token address |
// | | 36 | | 2. tokenId |
// | | 68 | | 3. offset to receiverData (*) |
// | Data | | | receiverData: |
// | | 100 | 32 | receiverData Length |
// | | 132 | ** | receiverData Contents |
// We construct calldata for the `token.safeTransferFrom` ABI.
// The layout of this calldata is in the table below.
@@ -103,14 +99,10 @@ contract ERC721Proxy is
// | Area | Offset | Length | Contents |
// |----------|--------|---------|-------------------------------------|
// | Header | 0 | 4 | function selector |
// | Params | | 4 * 32 | function parameters: |
// | Params | | 3 * 32 | function parameters: |
// | | 4 | | 1. from |
// | | 36 | | 2. to |
// | | 68 | | 3. tokenId |
// | | 100 | | 4. offset to receiverData (*) |
// | Data | | | receiverData: |
// | | 132 | 32 | receiverData Length |
// | | 164 | ** | receiverData Contents |
// There exists only 1 of each token.
// require(amount == 1, "INVALID_AMOUNT")
@@ -122,76 +114,32 @@ contract ERC721Proxy is
mstore(96, 0)
revert(0, 100)
}
// Require assetData to be at least 132 bytes
let offset := calldataload(4)
if lt(calldataload(add(offset, 4)), 132) {
// Revert with `Error("LENGTH_GREATER_THAN_131_REQUIRED")`
mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
mstore(64, 0x000000204c454e4754485f475245415445525f5448414e5f3133315f52455155)
mstore(96, 0x4952454400000000000000000000000000000000000000000000000000000000)
revert(0, 100)
}
/////// Setup State ///////
// `cdStart` is the start of the calldata for
// `token.safeTransferFrom` (equal to free memory ptr).
let cdStart := mload(64)
// `dataAreaLength` is the total number of words
// needed to store `receiverData`
// As-per the ABI spec, this value is padded up to
// the nearest multiple of 32,
// and includes 32-bytes for length.
// It's calculated as folows:
// - Unpadded length in bytes = `mload(receiverData) + 32`
// - Add 31 to convert rounding down to rounding up.
// Combined with the previous and this is `63`.
// - Round down to nearest multiple of 32 by clearing
// bits 0x1F. This is done with `and` and a mask.
/////// Setup Header Area ///////
// This area holds the 4-byte `transferFromSelector`.
// Any trailing data in transferFromSelector will be
// overwritten in the next `mstore` call.
mstore(cdStart, 0xb88d4fde00000000000000000000000000000000000000000000000000000000)
mstore(0, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
/////// Setup Params Area ///////
// Each parameter is padded to 32-bytes.
// The entire Params Area is 128 bytes.
// Notes:
// 1. A 20-byte mask is applied to addresses
// to zero-out the unused bytes.
// 2. The offset to `receiverData` is the length
// of the Params Area (128 bytes).
let length := calldataload(add(offset, 136))
let token := calldataload(add(offset, 40))
// Round length up to multiple of 32
length := and(add(length, 31), 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0)
// Copy `from` and `to`
calldatacopy(add(cdStart, 4), 36, 64)
// TokenId
mstore(add(cdStart, 68), calldataload(add(offset, 72)))
// Offset to receiverData
mstore(add(cdStart, 100), 128)
// receiverData (including length)
calldatacopy(add(cdStart, 132), add(offset, 136), add(length, 32))
/////// Call `token.safeTransferFrom` using the calldata ///////
// We copy the fields `from` and `to` in bulk
// from our own calldata to the new calldata.
calldatacopy(4, 36, 64)
// Copy `tokenId` field from our own calldata to the new calldata.
let assetDataOffset := calldataload(4)
calldatacopy(68, add(assetDataOffset, 72), 32)
/////// Call `token.transferFrom` using the calldata ///////
let token := calldataload(add(assetDataOffset, 40))
let success := call(
gas, // forward all gas
token, // call address of token contract
0, // don't send any ETH
cdStart, // pointer to start of input
add(length, 164), // length of input
0, // write output to null
0 // output size is 0 bytes
gas, // forward all gas
token, // call address of token contract
0, // don't send any ETH
0, // pointer to start of input
100, // length of input
0, // write output to null
0 // output size is 0 bytes
)
if success {
return(0, 0)