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authorAmir Bandeali <abandeali1@gmail.com>2018-06-29 09:27:53 +0800
committerAmir Bandeali <abandeali1@gmail.com>2018-06-30 04:33:22 +0800
commit8da42b12f4461f646378a32a5d910cdaa0069821 (patch)
tree1e71009c77a333f54e122b1f0799efc0f138f375 /packages/contracts/src
parentcc12bc9247d432b7f1248c8c0aaf9f905fa58d6d (diff)
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Remove transferFrom, implement in fallback function
Diffstat (limited to 'packages/contracts/src')
-rw-r--r--packages/contracts/src/contracts/current/protocol/AssetProxy/ERC20Proxy.sol201
-rw-r--r--packages/contracts/src/contracts/current/protocol/AssetProxy/ERC721Proxy.sol325
-rw-r--r--packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetData.sol12
-rw-r--r--packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetProxy.sol2
-rw-r--r--packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol3
-rw-r--r--packages/contracts/src/contracts/current/tokens/ERC721Token/ERC721Token.sol14
6 files changed, 267 insertions, 290 deletions
diff --git a/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC20Proxy.sol b/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC20Proxy.sol
index b4780b52b..aed62f54f 100644
--- a/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC20Proxy.sol
+++ b/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC20Proxy.sol
@@ -20,138 +20,103 @@ pragma solidity ^0.4.24;
pragma experimental ABIEncoderV2;
import "../../utils/LibBytes/LibBytes.sol";
-import "./interfaces/IAssetProxy.sol";
import "./MixinAuthorizable.sol";
contract ERC20Proxy is
- IAssetProxy,
MixinAuthorizable
{
// Id of this proxy.
bytes4 constant PROXY_ID = bytes4(keccak256("ERC20Token(address)"));
- /// @dev Internal version of `transferFrom`.
- /// @param assetData Encoded byte array.
- /// @param from Address to transfer asset from.
- /// @param to Address to transfer asset to.
- /// @param amount Amount of asset to transfer.
- function transferFrom(
- bytes assetData,
- address from,
- address to,
- uint256 amount
- )
+ function ()
external
{
- require(
- authorized[msg.sender],
- "SENDER_NOT_AUTHORIZED"
- );
-
- // `transferFrom`.
- // The function is marked `external`, so no abi decodeding is done for
- // us. Instead, we expect the `calldata` memory to contain the
- // following:
- //
- // | Area | Offset | Length | Contents |
- // |----------|--------|---------|-------------------------------------|
- // | Header | 0 | 4 | function selector |
- // | Params | | 4 * 32 | function parameters: |
- // | | 4 | | 1. offset to assetData (*) |
- // | | 36 | | 2. from |
- // | | 68 | | 3. to |
- // | | 100 | | 4. amount |
- // | Data | | | assetData: |
- // | | 132 | 32 | assetData Length |
- // | | 164 | ** | assetData Contents |
- //
- // (*): offset is computed from start of function parameters, so offset
- // by an additional 4 bytes in the calldata.
- //
- // 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 | | 1 * 32 | function parameters: |
- // | | 4 | 12 + 20 | 1. token address |
-
- // Transfer tokens.
- // We do a raw call so we can check the success separate
- // from the return data.
- // We construct calldata for the `token.transferFrom` ABI.
- // The layout of this calldata is in the table below.
- //
- // | Area | Offset | Length | Contents |
- // |----------|--------|---------|-------------------------------------|
- // | Header | 0 | 4 | function selector |
- // | Params | | 3 * 32 | function parameters: |
- // | | 4 | | 1. from |
- // | | 36 | | 2. to |
- // | | 68 | | 3. amount |
-
assembly {
- /////// Token contract address ///////
- // The token address is found as follows:
- // * It is stored at offset 4 in `assetData` contents.
- // * This is stored at offset 32 from `assetData`.
- // * The offset to `assetData` from Params is stored at offset
- // 4 in calldata.
- // * The offset of Params in calldata is 4.
- // So we read location 4 and add 32 + 4 + 4 to it.
- let token := calldataload(add(calldataload(4), 40))
-
- /////// Setup Header Area ///////
- // This area holds the 4-byte `transferFrom` selector.
- // Any trailing data in transferFromSelector will be
- // overwritten in the next `mstore` call.
- mstore(0, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
-
- /////// Setup Params Area ///////
- // We copy the fields `from`, `to` and `amount` in bulk
- // from our own calldata to the new calldata.
- calldatacopy(4, 36, 96)
+ // The first 4 bytes of calldata holds the function selector
+ let selector := and(calldataload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)
+
+ // `transferFrom` will be called with the following parameters:
+ // assetData Encoded byte array.
+ // from Address to transfer asset from.
+ // to Address to transfer asset to.
+ // amount Amount of asset to transfer.
+ // bytes4(keccak256("transferFrom(bytes,address,address,uint256)")) = 0xa85e59e4
+ if eq(selector, 0xa85e59e400000000000000000000000000000000000000000000000000000000) {
- /////// Call `token.transferFrom` using the calldata ///////
- let success := call(
- 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 over input
- 32 // output size should be 32 bytes
- )
+ // To lookup a value in a mapping, we load from the storage location keccak256(k, p),
+ // where k is the key left padded to 32 bytes and p is the storage slot
+ let start := mload(64)
+ mstore(start, and(caller, 0xffffffffffffffffffffffffffffffffffffffff))
+ mstore(add(start, 32), authorized_slot)
- /////// Check return data. ///////
- // If there is no return data, we assume the token incorrectly
- // does not return a bool. In this case we expect it to revert
- // on failure, which was handled above.
- // If the token does return data, we require that it is a single
- // nonzero 32 bytes value.
- // So the transfer succeeded if the call succeeded and either
- // returned nothing, or returned a non-zero 32 byte value.
- success := and(success, or(
- iszero(returndatasize),
- and(
- eq(returndatasize, 32),
- gt(mload(0), 0)
+ // Revert if authorized[msg.sender] == false
+ if iszero(sload(keccak256(start, 64))) {
+ // Revert with `Error("SENDER_NOT_AUTHORIZED")`
+ mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
+ mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
+ mstore(64, 0x0000001553454e4445525f4e4f545f415554484f52495a454400000000000000)
+ mstore(96, 0)
+ revert(0, 100)
+ }
+
+ /////// Token contract address ///////
+ // The token address is found as follows:
+ // * It is stored at offset 4 in `assetData` contents.
+ // * This is stored at offset 32 from `assetData`.
+ // * The offset to `assetData` from Params is stored at offset
+ // 4 in calldata.
+ // * The offset of Params in calldata is 4.
+ // So we read location 4 and add 32 + 4 + 4 to it.
+ let token := calldataload(add(calldataload(4), 40))
+
+ /////// Setup Header Area ///////
+ // This area holds the 4-byte `transferFrom` selector.
+ // Any trailing data in transferFromSelector will be
+ // overwritten in the next `mstore` call.
+ mstore(0, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
+
+ /////// Setup Params Area ///////
+ // We copy the fields `from`, `to` and `amount` in bulk
+ // from our own calldata to the new calldata.
+ calldatacopy(4, 36, 96)
+
+ /////// Call `token.transferFrom` using the calldata ///////
+ let success := call(
+ 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 over input
+ 32 // output size should be 32 bytes
)
- ))
- if success {
- return(0, 0)
+
+ /////// Check return data. ///////
+ // If there is no return data, we assume the token incorrectly
+ // does not return a bool. In this case we expect it to revert
+ // on failure, which was handled above.
+ // If the token does return data, we require that it is a single
+ // nonzero 32 bytes value.
+ // So the transfer succeeded if the call succeeded and either
+ // returned nothing, or returned a non-zero 32 byte value.
+ success := and(success, or(
+ iszero(returndatasize),
+ and(
+ eq(returndatasize, 32),
+ gt(mload(0), 0)
+ )
+ ))
+ if success {
+ return(0, 0)
+ }
+
+ // Revert with `Error("TRANSFER_FAILED")`
+ mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
+ mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
+ mstore(64, 0x0000000f5452414e534645525f4641494c454400000000000000000000000000)
+ mstore(96, 0)
+ revert(0, 100)
}
-
- // Revert with `Error("TRANSFER_FAILED")`
- mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
- mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
- mstore(64, 0x0000000f5452414e534645525f4641494c454400000000000000000000000000)
- mstore(96, 0)
- revert(0, 100)
}
}
@@ -159,7 +124,7 @@ contract ERC20Proxy is
/// @return Proxy id.
function getProxyId()
external
- view
+ pure
returns (bytes4)
{
return PROXY_ID;
diff --git a/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC721Proxy.sol b/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC721Proxy.sol
index 8d7cea717..b73dc36cc 100644
--- a/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC721Proxy.sol
+++ b/packages/contracts/src/contracts/current/protocol/AssetProxy/ERC721Proxy.sol
@@ -20,178 +20,189 @@ pragma solidity ^0.4.24;
pragma experimental ABIEncoderV2;
import "../../utils/LibBytes/LibBytes.sol";
-import "./interfaces/IAssetProxy.sol";
import "./MixinAuthorizable.sol";
contract ERC721Proxy is
- IAssetProxy,
MixinAuthorizable
{
// Id of this proxy.
bytes4 constant PROXY_ID = bytes4(keccak256("ERC721Token(address,uint256,bytes)"));
- /// @dev Internal version of `transferFrom`.
- /// @param assetData Encoded byte array.
- /// @param from Address to transfer asset from.
- /// @param to Address to transfer asset to.
- /// @param amount Amount of asset to transfer.
- function transferFrom(
- bytes assetData,
- address from,
- address to,
- uint256 amount
- )
+ function ()
external
{
- require(
- authorized[msg.sender],
- "SENDER_NOT_AUTHORIZED"
- );
-
- // `transferFrom`.
- // The function is marked `external`, so no abi decodeding is done for
- // us. Instead, we expect the `calldata` memory to contain the
- // following:
- //
- // | Area | Offset | Length | Contents |
- // |----------|--------|---------|-------------------------------------|
- // | Header | 0 | 4 | function selector |
- // | Params | | 4 * 32 | function parameters: |
- // | | 4 | | 1. offset to assetData (*) |
- // | | 36 | | 2. from |
- // | | 68 | | 3. to |
- // | | 100 | | 4. amount |
- // | Data | | | assetData: |
- // | | 132 | 32 | assetData Length |
- // | | 164 | ** | assetData Contents |
- //
- // (*): offset is computed from start of function parameters, so offset
- // by an additional 4 bytes in the calldata.
- //
- // 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: |
- // | | 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.
- //
- // | Area | Offset | Length | Contents |
- // |----------|--------|---------|-------------------------------------|
- // | Header | 0 | 4 | function selector |
- // | Params | | 4 * 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 |
-
assembly {
- // There exists only 1 of each token.
- // require(amount == 1, "INVALID_AMOUNT")
- if sub(calldataload(100), 1) {
- // Revert with `Error("INVALID_AMOUNT")`
+ // The first 4 bytes of calldata holds the function selector
+ let selector := and(calldataload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)
+
+ // `transferFrom` will be called with the following parameters:
+ // assetData Encoded byte array.
+ // from Address to transfer asset from.
+ // to Address to transfer asset to.
+ // amount Amount of asset to transfer.
+ // bytes4(keccak256("transferFrom(bytes,address,address,uint256)")) = 0xa85e59e4
+ if eq(selector, 0xa85e59e400000000000000000000000000000000000000000000000000000000) {
+
+ // To lookup a value in a mapping, we load from the storage location keccak256(k, p),
+ // where k is the key left padded to 32 bytes and p is the storage slot
+ let start := mload(64)
+ mstore(start, and(caller, 0xffffffffffffffffffffffffffffffffffffffff))
+ mstore(add(start, 32), authorized_slot)
+
+ // Revert if authorized[msg.sender] == false
+ if iszero(sload(keccak256(start, 64))) {
+ // Revert with `Error("SENDER_NOT_AUTHORIZED")`
+ mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
+ mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
+ mstore(64, 0x0000001553454e4445525f4e4f545f415554484f52495a454400000000000000)
+ mstore(96, 0)
+ revert(0, 100)
+ }
+
+ // `transferFrom`.
+ // The function is marked `external`, so no abi decodeding is done for
+ // us. Instead, we expect the `calldata` memory to contain the
+ // following:
+ //
+ // | Area | Offset | Length | Contents |
+ // |----------|--------|---------|-------------------------------------|
+ // | Header | 0 | 4 | function selector |
+ // | Params | | 4 * 32 | function parameters: |
+ // | | 4 | | 1. offset to assetData (*) |
+ // | | 36 | | 2. from |
+ // | | 68 | | 3. to |
+ // | | 100 | | 4. amount |
+ // | Data | | | assetData: |
+ // | | 132 | 32 | assetData Length |
+ // | | 164 | ** | assetData Contents |
+ //
+ // (*): offset is computed from start of function parameters, so offset
+ // by an additional 4 bytes in the calldata.
+ //
+ // 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: |
+ // | | 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.
+ //
+ // | Area | Offset | Length | Contents |
+ // |----------|--------|---------|-------------------------------------|
+ // | Header | 0 | 4 | function selector |
+ // | Params | | 4 * 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")
+ if sub(calldataload(100), 1) {
+ // Revert with `Error("INVALID_AMOUNT")`
+ mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
+ mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
+ mstore(64, 0x0000000e494e56414c49445f414d4f554e540000000000000000000000000000)
+ 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)
+
+ /////// 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 ///////
+ 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
+ )
+ if success {
+ return(0, 0)
+ }
+
+ // Revert with `Error("TRANSFER_FAILED")`
mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
- mstore(64, 0x0000000e494e56414c49445f414d4f554e540000000000000000000000000000)
+ mstore(64, 0x0000000f5452414e534645525f4641494c454400000000000000000000000000)
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)
-
- /////// 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 ///////
- 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
- )
- if success {
- return(0, 0)
- }
-
- // Revert with `Error("TRANSFER_FAILED")`
- mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
- mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
- mstore(64, 0x0000000f5452414e534645525f4641494c454400000000000000000000000000)
- mstore(96, 0)
- revert(0, 100)
}
}
@@ -199,7 +210,7 @@ contract ERC721Proxy is
/// @return Proxy id.
function getProxyId()
external
- view
+ pure
returns (bytes4)
{
return PROXY_ID;
diff --git a/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetData.sol b/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetData.sol
index 8c78ee8c4..7ebd6acf0 100644
--- a/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetData.sol
+++ b/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetData.sol
@@ -23,14 +23,16 @@ pragma solidity ^0.4.23;
// This argument is ABI encoded as one of the methods of this interface.
interface IAssetData {
- function ERC20Token(
- address tokenContract)
- external pure;
+ function ERC20Token(address tokenContract)
+ external
+ pure;
function ERC721Token(
address tokenContract,
uint256 tokenId,
- bytes receiverData)
- external pure;
+ bytes receiverData
+ )
+ external
+ pure;
}
diff --git a/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetProxy.sol b/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetProxy.sol
index ae8e195da..eacd5a412 100644
--- a/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetProxy.sol
+++ b/packages/contracts/src/contracts/current/protocol/AssetProxy/interfaces/IAssetProxy.sol
@@ -42,6 +42,6 @@ contract IAssetProxy is
/// @return Proxy id.
function getProxyId()
external
- view
+ pure
returns (bytes4);
}
diff --git a/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol b/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol
index f7086f543..643ccef81 100644
--- a/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol
+++ b/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol
@@ -135,7 +135,6 @@ contract MixinAssetProxyDispatcher is
// | | 132 | 32 | assetData Length |
// | | 164 | ** | assetData Contents |
- bool success;
assembly {
/////// Setup State ///////
// `cdStart` is the start of the calldata for `assetProxy.transferFrom` (equal to free memory ptr).
@@ -173,7 +172,7 @@ contract MixinAssetProxyDispatcher is
}
/////// Call `assetProxy.transferFrom` using the constructed calldata ///////
- success := call(
+ let success := call(
gas, // forward all gas
assetProxy, // call address of asset proxy
0, // don't send any ETH
diff --git a/packages/contracts/src/contracts/current/tokens/ERC721Token/ERC721Token.sol b/packages/contracts/src/contracts/current/tokens/ERC721Token/ERC721Token.sol
index 41ba149e3..cff34e99e 100644
--- a/packages/contracts/src/contracts/current/tokens/ERC721Token/ERC721Token.sol
+++ b/packages/contracts/src/contracts/current/tokens/ERC721Token/ERC721Token.sol
@@ -68,7 +68,7 @@ contract ERC721Token is
* @param _tokenId uint256 ID of the token to validate
*/
modifier canTransfer(uint256 _tokenId) {
- require(isApprovedOrOwner(msg.sender, _tokenId));
+ require(isApprovedOrOwner(msg.sender, _tokenId), "3");
_;
}
@@ -222,8 +222,8 @@ contract ERC721Token is
public
canTransfer(_tokenId)
{
- require(_from != address(0));
- require(_to != address(0));
+ require(_from != address(0), "1");
+ require(_to != address(0), "2");
clearApproval(_from, _tokenId);
removeTokenFrom(_from, _tokenId);
@@ -276,7 +276,7 @@ contract ERC721Token is
{
transferFrom(_from, _to, _tokenId);
// solium-disable-next-line arg-overflow
- require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
+ require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data), "7");
}
/**
@@ -331,7 +331,7 @@ contract ERC721Token is
function clearApproval(address _owner, uint256 _tokenId)
internal
{
- require(ownerOf(_tokenId) == _owner);
+ require(ownerOf(_tokenId) == _owner, "4");
if (tokenApprovals[_tokenId] != address(0)) {
tokenApprovals[_tokenId] = address(0);
emit Approval(_owner, address(0), _tokenId);
@@ -346,7 +346,7 @@ contract ERC721Token is
function addTokenTo(address _to, uint256 _tokenId)
internal
{
- require(tokenOwner[_tokenId] == address(0));
+ require(tokenOwner[_tokenId] == address(0), "6");
tokenOwner[_tokenId] = _to;
ownedTokensCount[_to] = safeAdd(ownedTokensCount[_to], 1);
}
@@ -359,7 +359,7 @@ contract ERC721Token is
function removeTokenFrom(address _from, uint256 _tokenId)
internal
{
- require(ownerOf(_tokenId) == _from);
+ require(ownerOf(_tokenId) == _from, "5");
ownedTokensCount[_from] = safeSub(ownedTokensCount[_from], 1);
tokenOwner[_tokenId] = address(0);
}