Contract Source Code:
File 1 of 1 : Wallet
/**
* The Consumer Contract Wallet
* Copyright (C) 2019 The Contract Wallet Company Limited
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
pragma solidity ^0.5.10;
contract Ownable {
event TransferredOwnership(address _from, address _to);
event LockedOwnership(address _locked);
address payable private _owner;
bool private _isTransferable;
/// @notice Constructor sets the original owner of the contract and whether or not it is one time transferable.
constructor(address payable _account_, bool _transferable_) internal {
_owner = _account_;
_isTransferable = _transferable_;
// Emit the LockedOwnership event if no longer transferable.
if (!_isTransferable) {
emit LockedOwnership(_account_);
}
emit TransferredOwnership(address(0), _account_);
}
/// @notice Reverts if called by any account other than the owner.
modifier onlyOwner() {
require(_isOwner(msg.sender), "sender is not an owner");
_;
}
/// @notice Allows the current owner to transfer control of the contract to a new address.
/// @param _account address to transfer ownership to.
/// @param _transferable indicates whether to keep the ownership transferable.
function transferOwnership(address payable _account, bool _transferable) external onlyOwner {
// Require that the ownership is transferable.
require(_isTransferable, "ownership is not transferable");
// Require that the new owner is not the zero address.
require(_account != address(0), "owner cannot be set to zero address");
// Set the transferable flag to the value _transferable passed in.
_isTransferable = _transferable;
// Emit the LockedOwnership event if no longer transferable.
if (!_transferable) {
emit LockedOwnership(_account);
}
// Emit the ownership transfer event.
emit TransferredOwnership(_owner, _account);
// Set the owner to the provided address.
_owner = _account;
}
/// @notice check if the ownership is transferable.
/// @return true if the ownership is transferable.
function isTransferable() external view returns (bool) {
return _isTransferable;
}
/// @notice Allows the current owner to relinquish control of the contract.
/// @dev Renouncing to ownership will leave the contract without an owner and unusable.
/// @dev It will not be possible to call the functions with the `onlyOwner` modifier anymore.
function renounceOwnership() external onlyOwner {
// Require that the ownership is transferable.
require(_isTransferable, "ownership is not transferable");
// note that this could be terminal
_owner = address(0);
emit TransferredOwnership(_owner, address(0));
}
/// @notice Find out owner address
/// @return address of the owner.
function owner() public view returns (address payable) {
return _owner;
}
/// @notice Check if owner address
/// @return true if sender is the owner of the contract.
function _isOwner(address _address) internal view returns (bool) {
return _address == _owner;
}
}
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, "SafeMath: division by zero");
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0, "SafeMath: modulo by zero");
return a % b;
}
}
contract ResolverBase {
bytes4 private constant INTERFACE_META_ID = 0x01ffc9a7;
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == INTERFACE_META_ID;
}
function isAuthorised(bytes32 node) internal view returns(bool);
modifier authorised(bytes32 node) {
require(isAuthorised(node));
_;
}
}
library strings {
struct slice {
uint _len;
uint _ptr;
}
function memcpy(uint dest, uint src, uint len) private pure {
// Copy word-length chunks while possible
for(; len >= 32; len -= 32) {
assembly {
mstore(dest, mload(src))
}
dest += 32;
src += 32;
}
// Copy remaining bytes
uint mask = 256 ** (32 - len) - 1;
assembly {
let srcpart := and(mload(src), not(mask))
let destpart := and(mload(dest), mask)
mstore(dest, or(destpart, srcpart))
}
}
/*
* @dev Returns a slice containing the entire string.
* @param self The string to make a slice from.
* @return A newly allocated slice containing the entire string.
*/
function toSlice(string memory self) internal pure returns (slice memory) {
uint ptr;
assembly {
ptr := add(self, 0x20)
}
return slice(bytes(self).length, ptr);
}
/*
* @dev Returns the length of a null-terminated bytes32 string.
* @param self The value to find the length of.
* @return The length of the string, from 0 to 32.
*/
function len(bytes32 self) internal pure returns (uint) {
uint ret;
if (self == 0)
return 0;
if (uint(self) & 0xffffffffffffffffffffffffffffffff == 0) {
ret += 16;
self = bytes32(uint(self) / 0x100000000000000000000000000000000);
}
if (uint(self) & 0xffffffffffffffff == 0) {
ret += 8;
self = bytes32(uint(self) / 0x10000000000000000);
}
if (uint(self) & 0xffffffff == 0) {
ret += 4;
self = bytes32(uint(self) / 0x100000000);
}
if (uint(self) & 0xffff == 0) {
ret += 2;
self = bytes32(uint(self) / 0x10000);
}
if (uint(self) & 0xff == 0) {
ret += 1;
}
return 32 - ret;
}
/*
* @dev Returns a slice containing the entire bytes32, interpreted as a
* null-terminated utf-8 string.
* @param self The bytes32 value to convert to a slice.
* @return A new slice containing the value of the input argument up to the
* first null.
*/
function toSliceB32(bytes32 self) internal pure returns (slice memory ret) {
// Allocate space for `self` in memory, copy it there, and point ret at it
assembly {
let ptr := mload(0x40)
mstore(0x40, add(ptr, 0x20))
mstore(ptr, self)
mstore(add(ret, 0x20), ptr)
}
ret._len = len(self);
}
/*
* @dev Returns a new slice containing the same data as the current slice.
* @param self The slice to copy.
* @return A new slice containing the same data as `self`.
*/
function copy(slice memory self) internal pure returns (slice memory) {
return slice(self._len, self._ptr);
}
/*
* @dev Copies a slice to a new string.
* @param self The slice to copy.
* @return A newly allocated string containing the slice's text.
*/
function toString(slice memory self) internal pure returns (string memory) {
string memory ret = new string(self._len);
uint retptr;
assembly { retptr := add(ret, 32) }
memcpy(retptr, self._ptr, self._len);
return ret;
}
/*
* @dev Returns the length in runes of the slice. Note that this operation
* takes time proportional to the length of the slice; avoid using it
* in loops, and call `slice.empty()` if you only need to know whether
* the slice is empty or not.
* @param self The slice to operate on.
* @return The length of the slice in runes.
*/
function len(slice memory self) internal pure returns (uint l) {
// Starting at ptr-31 means the LSB will be the byte we care about
uint ptr = self._ptr - 31;
uint end = ptr + self._len;
for (l = 0; ptr < end; l++) {
uint8 b;
assembly { b := and(mload(ptr), 0xFF) }
if (b < 0x80) {
ptr += 1;
} else if (b < 0xE0) {
ptr += 2;
} else if (b < 0xF0) {
ptr += 3;
} else if (b < 0xF8) {
ptr += 4;
} else if (b < 0xFC) {
ptr += 5;
} else {
ptr += 6;
}
}
}
/*
* @dev Returns true if the slice is empty (has a length of 0).
* @param self The slice to operate on.
* @return True if the slice is empty, False otherwise.
*/
function empty(slice memory self) internal pure returns (bool) {
return self._len == 0;
}
/*
* @dev Returns a positive number if `other` comes lexicographically after
* `self`, a negative number if it comes before, or zero if the
* contents of the two slices are equal. Comparison is done per-rune,
* on unicode codepoints.
* @param self The first slice to compare.
* @param other The second slice to compare.
* @return The result of the comparison.
*/
function compare(slice memory self, slice memory other) internal pure returns (int) {
uint shortest = self._len;
if (other._len < self._len)
shortest = other._len;
uint selfptr = self._ptr;
uint otherptr = other._ptr;
for (uint idx = 0; idx < shortest; idx += 32) {
uint a;
uint b;
assembly {
a := mload(selfptr)
b := mload(otherptr)
}
if (a != b) {
// Mask out irrelevant bytes and check again
uint256 mask = uint256(-1); // 0xffff...
if (shortest < 32) {
mask = ~(2 ** (8 * (32 - shortest + idx)) - 1);
}
uint256 diff = (a & mask) - (b & mask);
if (diff != 0)
return int(diff);
}
selfptr += 32;
otherptr += 32;
}
return int(self._len) - int(other._len);
}
/*
* @dev Returns true if the two slices contain the same text.
* @param self The first slice to compare.
* @param self The second slice to compare.
* @return True if the slices are equal, false otherwise.
*/
function equals(slice memory self, slice memory other) internal pure returns (bool) {
return compare(self, other) == 0;
}
/*
* @dev Extracts the first rune in the slice into `rune`, advancing the
* slice to point to the next rune and returning `self`.
* @param self The slice to operate on.
* @param rune The slice that will contain the first rune.
* @return `rune`.
*/
function nextRune(slice memory self, slice memory rune) internal pure returns (slice memory) {
rune._ptr = self._ptr;
if (self._len == 0) {
rune._len = 0;
return rune;
}
uint l;
uint b;
// Load the first byte of the rune into the LSBs of b
assembly { b := and(mload(sub(mload(add(self, 32)), 31)), 0xFF) }
if (b < 0x80) {
l = 1;
} else if (b < 0xE0) {
l = 2;
} else if (b < 0xF0) {
l = 3;
} else {
l = 4;
}
// Check for truncated codepoints
if (l > self._len) {
rune._len = self._len;
self._ptr += self._len;
self._len = 0;
return rune;
}
self._ptr += l;
self._len -= l;
rune._len = l;
return rune;
}
/*
* @dev Returns the first rune in the slice, advancing the slice to point
* to the next rune.
* @param self The slice to operate on.
* @return A slice containing only the first rune from `self`.
*/
function nextRune(slice memory self) internal pure returns (slice memory ret) {
nextRune(self, ret);
}
/*
* @dev Returns the number of the first codepoint in the slice.
* @param self The slice to operate on.
* @return The number of the first codepoint in the slice.
*/
function ord(slice memory self) internal pure returns (uint ret) {
if (self._len == 0) {
return 0;
}
uint word;
uint length;
uint divisor = 2 ** 248;
// Load the rune into the MSBs of b
assembly { word:= mload(mload(add(self, 32))) }
uint b = word / divisor;
if (b < 0x80) {
ret = b;
length = 1;
} else if (b < 0xE0) {
ret = b & 0x1F;
length = 2;
} else if (b < 0xF0) {
ret = b & 0x0F;
length = 3;
} else {
ret = b & 0x07;
length = 4;
}
// Check for truncated codepoints
if (length > self._len) {
return 0;
}
for (uint i = 1; i < length; i++) {
divisor = divisor / 256;
b = (word / divisor) & 0xFF;
if (b & 0xC0 != 0x80) {
// Invalid UTF-8 sequence
return 0;
}
ret = (ret * 64) | (b & 0x3F);
}
return ret;
}
/*
* @dev Returns the keccak-256 hash of the slice.
* @param self The slice to hash.
* @return The hash of the slice.
*/
function keccak(slice memory self) internal pure returns (bytes32 ret) {
assembly {
ret := keccak256(mload(add(self, 32)), mload(self))
}
}
/*
* @dev Returns true if `self` starts with `needle`.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return True if the slice starts with the provided text, false otherwise.
*/
function startsWith(slice memory self, slice memory needle) internal pure returns (bool) {
if (self._len < needle._len) {
return false;
}
if (self._ptr == needle._ptr) {
return true;
}
bool equal;
assembly {
let length := mload(needle)
let selfptr := mload(add(self, 0x20))
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
return equal;
}
/*
* @dev If `self` starts with `needle`, `needle` is removed from the
* beginning of `self`. Otherwise, `self` is unmodified.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return `self`
*/
function beyond(slice memory self, slice memory needle) internal pure returns (slice memory) {
if (self._len < needle._len) {
return self;
}
bool equal = true;
if (self._ptr != needle._ptr) {
assembly {
let length := mload(needle)
let selfptr := mload(add(self, 0x20))
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
}
if (equal) {
self._len -= needle._len;
self._ptr += needle._len;
}
return self;
}
/*
* @dev Returns true if the slice ends with `needle`.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return True if the slice starts with the provided text, false otherwise.
*/
function endsWith(slice memory self, slice memory needle) internal pure returns (bool) {
if (self._len < needle._len) {
return false;
}
uint selfptr = self._ptr + self._len - needle._len;
if (selfptr == needle._ptr) {
return true;
}
bool equal;
assembly {
let length := mload(needle)
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
return equal;
}
/*
* @dev If `self` ends with `needle`, `needle` is removed from the
* end of `self`. Otherwise, `self` is unmodified.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return `self`
*/
function until(slice memory self, slice memory needle) internal pure returns (slice memory) {
if (self._len < needle._len) {
return self;
}
uint selfptr = self._ptr + self._len - needle._len;
bool equal = true;
if (selfptr != needle._ptr) {
assembly {
let length := mload(needle)
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
}
if (equal) {
self._len -= needle._len;
}
return self;
}
// Returns the memory address of the first byte of the first occurrence of
// `needle` in `self`, or the first byte after `self` if not found.
function findPtr(uint selflen, uint selfptr, uint needlelen, uint needleptr) private pure returns (uint) {
uint ptr = selfptr;
uint idx;
if (needlelen <= selflen) {
if (needlelen <= 32) {
bytes32 mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));
bytes32 needledata;
assembly { needledata := and(mload(needleptr), mask) }
uint end = selfptr + selflen - needlelen;
bytes32 ptrdata;
assembly { ptrdata := and(mload(ptr), mask) }
while (ptrdata != needledata) {
if (ptr >= end)
return selfptr + selflen;
ptr++;
assembly { ptrdata := and(mload(ptr), mask) }
}
return ptr;
} else {
// For long needles, use hashing
bytes32 hash;
assembly { hash := keccak256(needleptr, needlelen) }
for (idx = 0; idx <= selflen - needlelen; idx++) {
bytes32 testHash;
assembly { testHash := keccak256(ptr, needlelen) }
if (hash == testHash)
return ptr;
ptr += 1;
}
}
}
return selfptr + selflen;
}
// Returns the memory address of the first byte after the last occurrence of
// `needle` in `self`, or the address of `self` if not found.
function rfindPtr(uint selflen, uint selfptr, uint needlelen, uint needleptr) private pure returns (uint) {
uint ptr;
if (needlelen <= selflen) {
if (needlelen <= 32) {
bytes32 mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));
bytes32 needledata;
assembly { needledata := and(mload(needleptr), mask) }
ptr = selfptr + selflen - needlelen;
bytes32 ptrdata;
assembly { ptrdata := and(mload(ptr), mask) }
while (ptrdata != needledata) {
if (ptr <= selfptr)
return selfptr;
ptr--;
assembly { ptrdata := and(mload(ptr), mask) }
}
return ptr + needlelen;
} else {
// For long needles, use hashing
bytes32 hash;
assembly { hash := keccak256(needleptr, needlelen) }
ptr = selfptr + (selflen - needlelen);
while (ptr >= selfptr) {
bytes32 testHash;
assembly { testHash := keccak256(ptr, needlelen) }
if (hash == testHash)
return ptr + needlelen;
ptr -= 1;
}
}
}
return selfptr;
}
/*
* @dev Modifies `self` to contain everything from the first occurrence of
* `needle` to the end of the slice. `self` is set to the empty slice
* if `needle` is not found.
* @param self The slice to search and modify.
* @param needle The text to search for.
* @return `self`.
*/
function find(slice memory self, slice memory needle) internal pure returns (slice memory) {
uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr);
self._len -= ptr - self._ptr;
self._ptr = ptr;
return self;
}
/*
* @dev Modifies `self` to contain the part of the string from the start of
* `self` to the end of the first occurrence of `needle`. If `needle`
* is not found, `self` is set to the empty slice.
* @param self The slice to search and modify.
* @param needle The text to search for.
* @return `self`.
*/
function rfind(slice memory self, slice memory needle) internal pure returns (slice memory) {
uint ptr = rfindPtr(self._len, self._ptr, needle._len, needle._ptr);
self._len = ptr - self._ptr;
return self;
}
/*
* @dev Splits the slice, setting `self` to everything after the first
* occurrence of `needle`, and `token` to everything before it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and `token` is set to the entirety of `self`.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @param token An output parameter to which the first token is written.
* @return `token`.
*/
function split(slice memory self, slice memory needle, slice memory token) internal pure returns (slice memory) {
uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr);
token._ptr = self._ptr;
token._len = ptr - self._ptr;
if (ptr == self._ptr + self._len) {
// Not found
self._len = 0;
} else {
self._len -= token._len + needle._len;
self._ptr = ptr + needle._len;
}
return token;
}
/*
* @dev Splits the slice, setting `self` to everything after the first
* occurrence of `needle`, and returning everything before it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and the entirety of `self` is returned.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @return The part of `self` up to the first occurrence of `delim`.
*/
function split(slice memory self, slice memory needle) internal pure returns (slice memory token) {
split(self, needle, token);
}
/*
* @dev Splits the slice, setting `self` to everything before the last
* occurrence of `needle`, and `token` to everything after it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and `token` is set to the entirety of `self`.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @param token An output parameter to which the first token is written.
* @return `token`.
*/
function rsplit(slice memory self, slice memory needle, slice memory token) internal pure returns (slice memory) {
uint ptr = rfindPtr(self._len, self._ptr, needle._len, needle._ptr);
token._ptr = ptr;
token._len = self._len - (ptr - self._ptr);
if (ptr == self._ptr) {
// Not found
self._len = 0;
} else {
self._len -= token._len + needle._len;
}
return token;
}
/*
* @dev Splits the slice, setting `self` to everything before the last
* occurrence of `needle`, and returning everything after it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and the entirety of `self` is returned.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @return The part of `self` after the last occurrence of `delim`.
*/
function rsplit(slice memory self, slice memory needle) internal pure returns (slice memory token) {
rsplit(self, needle, token);
}
/*
* @dev Counts the number of nonoverlapping occurrences of `needle` in `self`.
* @param self The slice to search.
* @param needle The text to search for in `self`.
* @return The number of occurrences of `needle` found in `self`.
*/
function count(slice memory self, slice memory needle) internal pure returns (uint cnt) {
uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr) + needle._len;
while (ptr <= self._ptr + self._len) {
cnt++;
ptr = findPtr(self._len - (ptr - self._ptr), ptr, needle._len, needle._ptr) + needle._len;
}
}
/*
* @dev Returns True if `self` contains `needle`.
* @param self The slice to search.
* @param needle The text to search for in `self`.
* @return True if `needle` is found in `self`, false otherwise.
*/
function contains(slice memory self, slice memory needle) internal pure returns (bool) {
return rfindPtr(self._len, self._ptr, needle._len, needle._ptr) != self._ptr;
}
/*
* @dev Returns a newly allocated string containing the concatenation of
* `self` and `other`.
* @param self The first slice to concatenate.
* @param other The second slice to concatenate.
* @return The concatenation of the two strings.
*/
function concat(slice memory self, slice memory other) internal pure returns (string memory) {
string memory ret = new string(self._len + other._len);
uint retptr;
assembly { retptr := add(ret, 32) }
memcpy(retptr, self._ptr, self._len);
memcpy(retptr + self._len, other._ptr, other._len);
return ret;
}
/*
* @dev Joins an array of slices, using `self` as a delimiter, returning a
* newly allocated string.
* @param self The delimiter to use.
* @param parts A list of slices to join.
* @return A newly allocated string containing all the slices in `parts`,
* joined with `self`.
*/
function join(slice memory self, slice[] memory parts) internal pure returns (string memory) {
if (parts.length == 0)
return "";
uint length = self._len * (parts.length - 1);
for (uint i = 0; i < parts.length; i++) {
length += parts[i]._len;
}
string memory ret = new string(length);
uint retptr;
assembly { retptr := add(ret, 32) }
for (uint i = 0; i < parts.length; i++) {
memcpy(retptr, parts[i]._ptr, parts[i]._len);
retptr += parts[i]._len;
if (i < parts.length - 1) {
memcpy(retptr, self._ptr, self._len);
retptr += self._len;
}
}
return ret;
}
}
interface ERC165 {
function supportsInterface(bytes4) external view returns (bool);
}
interface ENS {
// Logged when the owner of a node assigns a new owner to a subnode.
event NewOwner(bytes32 indexed node, bytes32 indexed label, address owner);
// Logged when the owner of a node transfers ownership to a new account.
event Transfer(bytes32 indexed node, address owner);
// Logged when the resolver for a node changes.
event NewResolver(bytes32 indexed node, address resolver);
// Logged when the TTL of a node changes
event NewTTL(bytes32 indexed node, uint64 ttl);
function setSubnodeOwner(bytes32 node, bytes32 label, address owner) external;
function setResolver(bytes32 node, address resolver) external;
function setOwner(bytes32 node, address owner) external;
function setTTL(bytes32 node, uint64 ttl) external;
function owner(bytes32 node) external view returns (address);
function resolver(bytes32 node) external view returns (address);
function ttl(bytes32 node) external view returns (uint64);
}
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* This test is non-exhaustive, and there may be false-negatives: during the
* execution of a contract's constructor, its address will be reported as
* not containing a contract.
*
* > It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*/
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
}
interface ERC20 {
function allowance(address _owner, address _spender) external view returns (uint256);
function approve(address _spender, uint256 _value) external returns (bool);
function balanceOf(address _who) external view returns (uint256);
function totalSupply() external view returns (uint256);
function transfer(address _to, uint256 _value) external returns (bool);
function transferFrom(address _from, address _to, uint256 _value) external returns (bool);
}
contract AddrResolver is ResolverBase {
bytes4 constant private ADDR_INTERFACE_ID = 0x3b3b57de;
event AddrChanged(bytes32 indexed node, address a);
mapping(bytes32=>address) addresses;
/**
* Sets the address associated with an ENS node.
* May only be called by the owner of that node in the ENS registry.
* @param node The node to update.
* @param addr The address to set.
*/
function setAddr(bytes32 node, address addr) external authorised(node) {
addresses[node] = addr;
emit AddrChanged(node, addr);
}
/**
* Returns the address associated with an ENS node.
* @param node The ENS node to query.
* @return The associated address.
*/
function addr(bytes32 node) public view returns (address) {
return addresses[node];
}
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == ADDR_INTERFACE_ID || super.supportsInterface(interfaceID);
}
}
contract ContentHashResolver is ResolverBase {
bytes4 constant private CONTENT_HASH_INTERFACE_ID = 0xbc1c58d1;
event ContenthashChanged(bytes32 indexed node, bytes hash);
mapping(bytes32=>bytes) hashes;
/**
* Sets the contenthash associated with an ENS node.
* May only be called by the owner of that node in the ENS registry.
* @param node The node to update.
* @param hash The contenthash to set
*/
function setContenthash(bytes32 node, bytes calldata hash) external authorised(node) {
hashes[node] = hash;
emit ContenthashChanged(node, hash);
}
/**
* Returns the contenthash associated with an ENS node.
* @param node The ENS node to query.
* @return The associated contenthash.
*/
function contenthash(bytes32 node) external view returns (bytes memory) {
return hashes[node];
}
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == CONTENT_HASH_INTERFACE_ID || super.supportsInterface(interfaceID);
}
}
contract NameResolver is ResolverBase {
bytes4 constant private NAME_INTERFACE_ID = 0x691f3431;
event NameChanged(bytes32 indexed node, string name);
mapping(bytes32=>string) names;
/**
* Sets the name associated with an ENS node, for reverse records.
* May only be called by the owner of that node in the ENS registry.
* @param node The node to update.
* @param name The name to set.
*/
function setName(bytes32 node, string calldata name) external authorised(node) {
names[node] = name;
emit NameChanged(node, name);
}
/**
* Returns the name associated with an ENS node, for reverse records.
* Defined in EIP181.
* @param node The ENS node to query.
* @return The associated name.
*/
function name(bytes32 node) external view returns (string memory) {
return names[node];
}
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == NAME_INTERFACE_ID || super.supportsInterface(interfaceID);
}
}
contract ABIResolver is ResolverBase {
bytes4 constant private ABI_INTERFACE_ID = 0x2203ab56;
event ABIChanged(bytes32 indexed node, uint256 indexed contentType);
mapping(bytes32=>mapping(uint256=>bytes)) abis;
/**
* Sets the ABI associated with an ENS node.
* Nodes may have one ABI of each content type. To remove an ABI, set it to
* the empty string.
* @param node The node to update.
* @param contentType The content type of the ABI
* @param data The ABI data.
*/
function setABI(bytes32 node, uint256 contentType, bytes calldata data) external authorised(node) {
// Content types must be powers of 2
require(((contentType - 1) & contentType) == 0);
abis[node][contentType] = data;
emit ABIChanged(node, contentType);
}
/**
* Returns the ABI associated with an ENS node.
* Defined in EIP205.
* @param node The ENS node to query
* @param contentTypes A bitwise OR of the ABI formats accepted by the caller.
* @return contentType The content type of the return value
* @return data The ABI data
*/
function ABI(bytes32 node, uint256 contentTypes) external view returns (uint256, bytes memory) {
mapping(uint256=>bytes) storage abiset = abis[node];
for (uint256 contentType = 1; contentType <= contentTypes; contentType <<= 1) {
if ((contentType & contentTypes) != 0 && abiset[contentType].length > 0) {
return (contentType, abiset[contentType]);
}
}
return (0, bytes(""));
}
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == ABI_INTERFACE_ID || super.supportsInterface(interfaceID);
}
}
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(ERC20 token, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
function safeApprove(ERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(ERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(ERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function callOptionalReturn(ERC20 token, bytes memory data) internal {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves.
// A Solidity high level call has three parts:
// 1. The target address is checked to verify it contains contract code
// 2. The call itself is made, and success asserted
// 3. The return value is decoded, which in turn checks the size of the returned data.
// solhint-disable-next-line max-line-length
require(address(token).isContract(), "SafeERC20: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
library BytesUtils {
using SafeMath for uint256;
/// @dev This function converts to an address
/// @param _bts bytes
/// @param _from start position
function _bytesToAddress(bytes memory _bts, uint _from) internal pure returns (address) {
require(_bts.length >= _from.add(20), "slicing out of range");
bytes20 convertedAddress;
uint startByte = _from.add(32); //first 32 bytes denote the array length
assembly {
convertedAddress := mload(add(_bts, startByte))
}
return address(convertedAddress);
}
/// @dev This function slices bytes into bytes4
/// @param _bts some bytes
/// @param _from start position
function _bytesToBytes4(bytes memory _bts, uint _from) internal pure returns (bytes4) {
require(_bts.length >= _from.add(4), "slicing out of range");
bytes4 slicedBytes4;
uint startByte = _from.add(32); //first 32 bytes denote the array length
assembly {
slicedBytes4 := mload(add(_bts, startByte))
}
return slicedBytes4;
}
/// @dev This function slices a uint
/// @param _bts some bytes
/// @param _from start position
// credit to https://ethereum.stackexchange.com/questions/51229/how-to-convert-bytes-to-uint-in-solidity
// and Nick Johnson https://ethereum.stackexchange.com/questions/4170/how-to-convert-a-uint-to-bytes-in-solidity/4177#4177
function _bytesToUint256(bytes memory _bts, uint _from) internal pure returns (uint) {
require(_bts.length >= _from.add(32), "slicing out of range");
uint convertedUint256;
uint startByte = _from.add(32); //first 32 bytes denote the array length
assembly {
convertedUint256 := mload(add(_bts, startByte))
}
return convertedUint256;
}
}
contract Balanceable {
/// @dev This function is used to get a balance
/// @param _address of which balance we are trying to ascertain
/// @param _asset is the address of an ERC20 token or 0x0 for ether.
/// @return balance associated with an address, for any token, in the wei equivalent
function _balance(address _address, address _asset) internal view returns (uint) {
if (_asset != address(0)) {
return ERC20(_asset).balanceOf(_address);
} else {
return _address.balance;
}
}
}
contract PubkeyResolver is ResolverBase {
bytes4 constant private PUBKEY_INTERFACE_ID = 0xc8690233;
event PubkeyChanged(bytes32 indexed node, bytes32 x, bytes32 y);
struct PublicKey {
bytes32 x;
bytes32 y;
}
mapping(bytes32=>PublicKey) pubkeys;
/**
* Sets the SECP256k1 public key associated with an ENS node.
* @param node The ENS node to query
* @param x the X coordinate of the curve point for the public key.
* @param y the Y coordinate of the curve point for the public key.
*/
function setPubkey(bytes32 node, bytes32 x, bytes32 y) external authorised(node) {
pubkeys[node] = PublicKey(x, y);
emit PubkeyChanged(node, x, y);
}
/**
* Returns the SECP256k1 public key associated with an ENS node.
* Defined in EIP 619.
* @param node The ENS node to query
* @return x, y the X and Y coordinates of the curve point for the public key.
*/
function pubkey(bytes32 node) external view returns (bytes32 x, bytes32 y) {
return (pubkeys[node].x, pubkeys[node].y);
}
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == PUBKEY_INTERFACE_ID || super.supportsInterface(interfaceID);
}
}
contract TextResolver is ResolverBase {
bytes4 constant private TEXT_INTERFACE_ID = 0x59d1d43c;
event TextChanged(bytes32 indexed node, string indexedKey, string key);
mapping(bytes32=>mapping(string=>string)) texts;
/**
* Sets the text data associated with an ENS node and key.
* May only be called by the owner of that node in the ENS registry.
* @param node The node to update.
* @param key The key to set.
* @param value The text data value to set.
*/
function setText(bytes32 node, string calldata key, string calldata value) external authorised(node) {
texts[node][key] = value;
emit TextChanged(node, key, key);
}
/**
* Returns the text data associated with an ENS node and key.
* @param node The ENS node to query.
* @param key The text data key to query.
* @return The associated text data.
*/
function text(bytes32 node, string calldata key) external view returns (string memory) {
return texts[node][key];
}
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == TEXT_INTERFACE_ID || super.supportsInterface(interfaceID);
}
}
contract Transferrable {
using SafeERC20 for ERC20;
/// @dev This function is used to move tokens sent accidentally to this contract method.
/// @dev The owner can chose the new destination address
/// @param _to is the recipient's address.
/// @param _asset is the address of an ERC20 token or 0x0 for ether.
/// @param _amount is the amount to be transferred in base units.
function _safeTransfer(address payable _to, address _asset, uint _amount) internal {
// address(0) is used to denote ETH
if (_asset == address(0)) {
_to.transfer(_amount);
} else {
ERC20(_asset).safeTransfer(_to, _amount);
}
}
}
contract InterfaceResolver is ResolverBase, AddrResolver {
bytes4 constant private INTERFACE_INTERFACE_ID = bytes4(keccak256("interfaceImplementer(bytes32,bytes4)"));
bytes4 private constant INTERFACE_META_ID = 0x01ffc9a7;
event InterfaceChanged(bytes32 indexed node, bytes4 indexed interfaceID, address implementer);
mapping(bytes32=>mapping(bytes4=>address)) interfaces;
/**
* Sets an interface associated with a name.
* Setting the address to 0 restores the default behaviour of querying the contract at `addr()` for interface support.
* @param node The node to update.
* @param interfaceID The EIP 168 interface ID.
* @param implementer The address of a contract that implements this interface for this node.
*/
function setInterface(bytes32 node, bytes4 interfaceID, address implementer) external authorised(node) {
interfaces[node][interfaceID] = implementer;
emit InterfaceChanged(node, interfaceID, implementer);
}
/**
* Returns the address of a contract that implements the specified interface for this name.
* If an implementer has not been set for this interfaceID and name, the resolver will query
* the contract at `addr()`. If `addr()` is set, a contract exists at that address, and that
* contract implements EIP168 and returns `true` for the specified interfaceID, its address
* will be returned.
* @param node The ENS node to query.
* @param interfaceID The EIP 168 interface ID to check for.
* @return The address that implements this interface, or 0 if the interface is unsupported.
*/
function interfaceImplementer(bytes32 node, bytes4 interfaceID) external view returns (address) {
address implementer = interfaces[node][interfaceID];
if(implementer != address(0)) {
return implementer;
}
address a = addr(node);
if(a == address(0)) {
return address(0);
}
(bool success, bytes memory returnData) = a.staticcall(abi.encodeWithSignature("supportsInterface(bytes4)", INTERFACE_META_ID));
if(!success || returnData.length < 32 || returnData[31] == 0) {
// EIP 168 not supported by target
return address(0);
}
(success, returnData) = a.staticcall(abi.encodeWithSignature("supportsInterface(bytes4)", interfaceID));
if(!success || returnData.length < 32 || returnData[31] == 0) {
// Specified interface not supported by target
return address(0);
}
return a;
}
function supportsInterface(bytes4 interfaceID) public pure returns(bool) {
return interfaceID == INTERFACE_INTERFACE_ID || super.supportsInterface(interfaceID);
}
}
interface IController {
function isController(address) external view returns (bool);
function isAdmin(address) external view returns (bool);
}
/// @title Controller stores a list of controller addresses that can be used for authentication in other contracts.
/// @notice The Controller implements a hierarchy of concepts, Owner, Admin, and the Controllers.
/// @dev Owner can change the Admins
/// @dev Admins and can the Controllers
/// @dev Controllers are used by the application.
contract Controller is IController, Ownable, Transferrable {
event AddedController(address _sender, address _controller);
event RemovedController(address _sender, address _controller);
event AddedAdmin(address _sender, address _admin);
event RemovedAdmin(address _sender, address _admin);
event Claimed(address _to, address _asset, uint _amount);
event Stopped(address _sender);
event Started(address _sender);
mapping (address => bool) private _isAdmin;
uint private _adminCount;
mapping (address => bool) private _isController;
uint private _controllerCount;
bool private _stopped;
/// @notice Constructor initializes the owner with the provided address.
/// @param _ownerAddress_ address of the owner.
constructor(address payable _ownerAddress_) Ownable(_ownerAddress_, false) public {}
/// @notice Checks if message sender is an admin.
modifier onlyAdmin() {
require(isAdmin(msg.sender), "sender is not an admin");
_;
}
/// @notice Check if Owner or Admin
modifier onlyAdminOrOwner() {
require(_isOwner(msg.sender) || isAdmin(msg.sender), "sender is not an admin");
_;
}
/// @notice Check if controller is stopped
modifier notStopped() {
require(!isStopped(), "controller is stopped");
_;
}
/// @notice Add a new admin to the list of admins.
/// @param _account address to add to the list of admins.
function addAdmin(address _account) external onlyOwner notStopped {
_addAdmin(_account);
}
/// @notice Remove a admin from the list of admins.
/// @param _account address to remove from the list of admins.
function removeAdmin(address _account) external onlyOwner {
_removeAdmin(_account);
}
/// @return the current number of admins.
function adminCount() external view returns (uint) {
return _adminCount;
}
/// @notice Add a new controller to the list of controllers.
/// @param _account address to add to the list of controllers.
function addController(address _account) external onlyAdminOrOwner notStopped {
_addController(_account);
}
/// @notice Remove a controller from the list of controllers.
/// @param _account address to remove from the list of controllers.
function removeController(address _account) external onlyAdminOrOwner {
_removeController(_account);
}
/// @notice count the Controllers
/// @return the current number of controllers.
function controllerCount() external view returns (uint) {
return _controllerCount;
}
/// @notice is an address an Admin?
/// @return true if the provided account is an admin.
function isAdmin(address _account) public view notStopped returns (bool) {
return _isAdmin[_account];
}
/// @notice is an address a Controller?
/// @return true if the provided account is a controller.
function isController(address _account) public view notStopped returns (bool) {
return _isController[_account];
}
/// @notice this function can be used to see if the controller has been stopped
/// @return true is the Controller has been stopped
function isStopped() public view returns (bool) {
return _stopped;
}
/// @notice Internal-only function that adds a new admin.
function _addAdmin(address _account) private {
require(!_isAdmin[_account], "provided account is already an admin");
require(!_isController[_account], "provided account is already a controller");
require(!_isOwner(_account), "provided account is already the owner");
require(_account != address(0), "provided account is the zero address");
_isAdmin[_account] = true;
_adminCount++;
emit AddedAdmin(msg.sender, _account);
}
/// @notice Internal-only function that removes an existing admin.
function _removeAdmin(address _account) private {
require(_isAdmin[_account], "provided account is not an admin");
_isAdmin[_account] = false;
_adminCount--;
emit RemovedAdmin(msg.sender, _account);
}
/// @notice Internal-only function that adds a new controller.
function _addController(address _account) private {
require(!_isAdmin[_account], "provided account is already an admin");
require(!_isController[_account], "provided account is already a controller");
require(!_isOwner(_account), "provided account is already the owner");
require(_account != address(0), "provided account is the zero address");
_isController[_account] = true;
_controllerCount++;
emit AddedController(msg.sender, _account);
}
/// @notice Internal-only function that removes an existing controller.
function _removeController(address _account) private {
require(_isController[_account], "provided account is not a controller");
_isController[_account] = false;
_controllerCount--;
emit RemovedController(msg.sender, _account);
}
/// @notice stop our controllers and admins from being useable
function stop() external onlyAdminOrOwner {
_stopped = true;
emit Stopped(msg.sender);
}
/// @notice start our controller again
function start() external onlyOwner {
_stopped = false;
emit Started(msg.sender);
}
//// @notice Withdraw tokens from the smart contract to the specified account.
function claim(address payable _to, address _asset, uint _amount) external onlyAdmin notStopped {
_safeTransfer(_to, _asset, _amount);
emit Claimed(_to, _asset, _amount);
}
}
contract PublicResolver is ABIResolver, AddrResolver, ContentHashResolver, InterfaceResolver, NameResolver, PubkeyResolver, TextResolver {
ENS ens;
/**
* A mapping of authorisations. An address that is authorised for a name
* may make any changes to the name that the owner could, but may not update
* the set of authorisations.
* (node, owner, caller) => isAuthorised
*/
mapping(bytes32=>mapping(address=>mapping(address=>bool))) public authorisations;
event AuthorisationChanged(bytes32 indexed node, address indexed owner, address indexed target, bool isAuthorised);
constructor(ENS _ens) public {
ens = _ens;
}
/**
* @dev Sets or clears an authorisation.
* Authorisations are specific to the caller. Any account can set an authorisation
* for any name, but the authorisation that is checked will be that of the
* current owner of a name. Thus, transferring a name effectively clears any
* existing authorisations, and new authorisations can be set in advance of
* an ownership transfer if desired.
*
* @param node The name to change the authorisation on.
* @param target The address that is to be authorised or deauthorised.
* @param isAuthorised True if the address should be authorised, or false if it should be deauthorised.
*/
function setAuthorisation(bytes32 node, address target, bool isAuthorised) external {
authorisations[node][msg.sender][target] = isAuthorised;
emit AuthorisationChanged(node, msg.sender, target, isAuthorised);
}
function isAuthorised(bytes32 node) internal view returns(bool) {
address owner = ens.owner(node);
return owner == msg.sender || authorisations[node][owner][msg.sender];
}
}
contract ENSResolvable {
/// @notice _ens is an instance of ENS
ENS private _ens;
/// @notice _ensRegistry points to the ENS registry smart contract.
address private _ensRegistry;
/// @param _ensReg_ is the ENS registry used
constructor(address _ensReg_) internal {
_ensRegistry = _ensReg_;
_ens = ENS(_ensRegistry);
}
/// @notice this is used to that one can observe which ENS registry is being used
function ensRegistry() external view returns (address) {
return _ensRegistry;
}
/// @notice helper function used to get the address of a node
/// @param _node of the ENS entry that needs resolving
/// @return the address of the said node
function _ensResolve(bytes32 _node) internal view returns (address) {
return PublicResolver(_ens.resolver(_node)).addr(_node);
}
}
contract Controllable is ENSResolvable {
/// @dev Is the registered ENS node identifying the controller contract.
bytes32 private _controllerNode;
/// @notice Constructor initializes the controller contract object.
/// @param _controllerNode_ is the ENS node of the Controller.
constructor(bytes32 _controllerNode_) internal {
_controllerNode = _controllerNode_;
}
/// @notice Checks if message sender is a controller.
modifier onlyController() {
require(_isController(msg.sender), "sender is not a controller");
_;
}
/// @notice Checks if message sender is an admin.
modifier onlyAdmin() {
require(_isAdmin(msg.sender), "sender is not an admin");
_;
}
/// @return the controller node registered in ENS.
function controllerNode() external view returns (bytes32) {
return _controllerNode;
}
/// @return true if the provided account is a controller.
function _isController(address _account) internal view returns (bool) {
return IController(_ensResolve(_controllerNode)).isController(_account);
}
/// @return true if the provided account is an admin.
function _isAdmin(address _account) internal view returns (bool) {
return IController(_ensResolve(_controllerNode)).isAdmin(_account);
}
}
interface ILicence {
function load(address, uint) external payable;
function updateLicenceAmount(uint) external;
}
/// @title Licence loads the TokenCard and transfers the licence amout to the TKN Holder Contract.
/// @notice the rest of the amount gets sent to the CryptoFloat
contract Licence is Transferrable, ENSResolvable, Controllable {
using SafeMath for uint256;
using SafeERC20 for ERC20;
/*******************/
/* Events */
/*****************/
event UpdatedLicenceDAO(address _newDAO);
event UpdatedCryptoFloat(address _newFloat);
event UpdatedTokenHolder(address _newHolder);
event UpdatedTKNContractAddress(address _newTKN);
event UpdatedLicenceAmount(uint _newAmount);
event TransferredToTokenHolder(address _from, address _to, address _asset, uint _amount);
event TransferredToCryptoFloat(address _from, address _to, address _asset, uint _amount);
event Claimed(address _to, address _asset, uint _amount);
/// @notice This is 100% scaled up by a factor of 10 to give us an extra 1 decimal place of precision
uint constant public MAX_AMOUNT_SCALE = 1000;
uint constant public MIN_AMOUNT_SCALE = 1;
address private _tknContractAddress = 0xaAAf91D9b90dF800Df4F55c205fd6989c977E73a; // solium-disable-line uppercase
address payable private _cryptoFloat;
address payable private _tokenHolder;
address private _licenceDAO;
bool private _lockedCryptoFloat;
bool private _lockedTokenHolder;
bool private _lockedLicenceDAO;
bool private _lockedTKNContractAddress;
/// @notice This is the _licenceAmountScaled by a factor of 10
/// @dev i.e. 1% is 10 _licenceAmountScaled, 0.1% is 1 _licenceAmountScaled
uint private _licenceAmountScaled;
/// @notice Reverts if called by any address other than the DAO contract.
modifier onlyDAO() {
require(msg.sender == _licenceDAO, "the sender isn't the DAO");
_;
}
/// @notice Constructor initializes the card licence contract.
/// @param _licence_ is the initial card licence amount. this number is scaled 10 = 1%, 9 = 0.9%
/// @param _float_ is the address of the multi-sig cryptocurrency float contract.
/// @param _holder_ is the address of the token holder contract
/// @param _tknAddress_ is the address of the TKN ERC20 contract
/// @param _ens_ is the address of the ENS Registry
/// @param _controllerNode_ is the ENS node corresponding to the controller
constructor(uint _licence_, address payable _float_, address payable _holder_, address _tknAddress_, address _ens_, bytes32 _controllerNode_) ENSResolvable(_ens_) Controllable(_controllerNode_) public {
require(MIN_AMOUNT_SCALE <= _licence_ && _licence_ <= MAX_AMOUNT_SCALE, "licence amount out of range");
_licenceAmountScaled = _licence_;
_cryptoFloat = _float_;
_tokenHolder = _holder_;
if (_tknAddress_ != address(0)) {
_tknContractAddress = _tknAddress_;
}
}
/// @notice Ether can be deposited from any source, so this contract should be payable by anyone.
function() external payable {}
/// @notice this allows for people to see the scaled licence amount
/// @return the scaled licence amount, used to calculate the split when loading.
function licenceAmountScaled() external view returns (uint) {
return _licenceAmountScaled;
}
/// @notice allows one to see the address of the CryptoFloat
/// @return the address of the multi-sig cryptocurrency float contract.
function cryptoFloat() external view returns (address) {
return _cryptoFloat;
}
/// @notice allows one to see the address TKN holder contract
/// @return the address of the token holder contract.
function tokenHolder() external view returns (address) {
return _tokenHolder;
}
/// @notice allows one to see the address of the DAO
/// @return the address of the DAO contract.
function licenceDAO() external view returns (address) {
return _licenceDAO;
}
/// @notice The address of the TKN token
/// @return the address of the TKN contract.
function tknContractAddress() external view returns (address) {
return _tknContractAddress;
}
/// @notice This locks the cryptoFloat address
/// @dev so that it can no longer be updated
function lockFloat() external onlyAdmin {
_lockedCryptoFloat = true;
}
/// @notice This locks the TokenHolder address
/// @dev so that it can no longer be updated
function lockHolder() external onlyAdmin {
_lockedTokenHolder = true;
}
/// @notice This locks the DAO address
/// @dev so that it can no longer be updated
function lockLicenceDAO() external onlyAdmin {
_lockedLicenceDAO = true;
}
/// @notice This locks the TKN address
/// @dev so that it can no longer be updated
function lockTKNContractAddress() external onlyAdmin {
_lockedTKNContractAddress = true;
}
/// @notice Updates the address of the cyptoFloat.
/// @param _newFloat This is the new address for the CryptoFloat
function updateFloat(address payable _newFloat) external onlyAdmin {
require(!floatLocked(), "float is locked");
_cryptoFloat = _newFloat;
emit UpdatedCryptoFloat(_newFloat);
}
/// @notice Updates the address of the Holder contract.
/// @param _newHolder This is the new address for the TokenHolder
function updateHolder(address payable _newHolder) external onlyAdmin {
require(!holderLocked(), "holder contract is locked");
_tokenHolder = _newHolder;
emit UpdatedTokenHolder(_newHolder);
}
/// @notice Updates the address of the DAO contract.
/// @param _newDAO This is the new address for the Licence DAO
function updateLicenceDAO(address _newDAO) external onlyAdmin {
require(!licenceDAOLocked(), "DAO is locked");
_licenceDAO = _newDAO;
emit UpdatedLicenceDAO(_newDAO);
}
/// @notice Updates the address of the TKN contract.
/// @param _newTKN This is the new address for the TKN contract
function updateTKNContractAddress(address _newTKN) external onlyAdmin {
require(!tknContractAddressLocked(), "TKN is locked");
_tknContractAddress = _newTKN;
emit UpdatedTKNContractAddress(_newTKN);
}
/// @notice Updates the TKN licence amount
/// @param _newAmount is a number between MIN_AMOUNT_SCALE (1) and MAX_AMOUNT_SCALE
function updateLicenceAmount(uint _newAmount) external onlyDAO {
require(MIN_AMOUNT_SCALE <= _newAmount && _newAmount <= MAX_AMOUNT_SCALE, "licence amount out of range");
_licenceAmountScaled = _newAmount;
emit UpdatedLicenceAmount(_newAmount);
}
/// @notice Load the holder and float contracts based on the licence amount and asset amount.
/// @param _asset is the address of an ERC20 token or 0x0 for ether.
/// @param _amount is the amount of assets to be transferred including the licence amount.
function load(address _asset, uint _amount) external payable {
uint loadAmount = _amount;
// If TKN then no licence to be paid
if (_asset == _tknContractAddress) {
ERC20(_asset).safeTransferFrom(msg.sender, _cryptoFloat, loadAmount);
} else {
loadAmount = _amount.mul(MAX_AMOUNT_SCALE).div(_licenceAmountScaled + MAX_AMOUNT_SCALE);
uint licenceAmount = _amount.sub(loadAmount);
if (_asset != address(0)) {
ERC20(_asset).safeTransferFrom(msg.sender, _tokenHolder, licenceAmount);
ERC20(_asset).safeTransferFrom(msg.sender, _cryptoFloat, loadAmount);
} else {
require(msg.value == _amount, "ETH sent is not equal to amount");
_tokenHolder.transfer(licenceAmount);
_cryptoFloat.transfer(loadAmount);
}
emit TransferredToTokenHolder(msg.sender, _tokenHolder, _asset, licenceAmount);
}
emit TransferredToCryptoFloat(msg.sender, _cryptoFloat, _asset, loadAmount);
}
//// @notice Withdraw tokens from the smart contract to the specified account.
function claim(address payable _to, address _asset, uint _amount) external onlyAdmin {
_safeTransfer(_to, _asset, _amount);
emit Claimed(_to, _asset, _amount);
}
/// @notice returns whether or not the CryptoFloat address is locked
function floatLocked() public view returns (bool) {
return _lockedCryptoFloat;
}
/// @notice returns whether or not the TokenHolder address is locked
function holderLocked() public view returns (bool) {
return _lockedTokenHolder;
}
/// @notice returns whether or not the Licence DAO address is locked
function licenceDAOLocked() public view returns (bool) {
return _lockedLicenceDAO;
}
/// @notice returns whether or not the TKN address is locked
function tknContractAddressLocked() public view returns (bool) {
return _lockedTKNContractAddress;
}
}
interface ITokenWhitelist {
function getTokenInfo(address) external view returns (string memory, uint256, uint256, bool, bool, bool, uint256);
function getStablecoinInfo() external view returns (string memory, uint256, uint256, bool, bool, bool, uint256);
function tokenAddressArray() external view returns (address[] memory);
function redeemableTokens() external view returns (address[] memory);
function methodIdWhitelist(bytes4) external view returns (bool);
function getERC20RecipientAndAmount(address, bytes calldata) external view returns (address, uint);
function stablecoin() external view returns (address);
function updateTokenRate(address, uint, uint) external;
}
/// @title TokenWhitelist stores a list of tokens used by the Consumer Contract Wallet, the Oracle, the TKN Holder and the TKN Licence Contract
contract TokenWhitelist is ENSResolvable, Controllable, Transferrable {
using strings for *;
using SafeMath for uint256;
using BytesUtils for bytes;
event UpdatedTokenRate(address _sender, address _token, uint _rate);
event UpdatedTokenLoadable(address _sender, address _token, bool _loadable);
event UpdatedTokenRedeemable(address _sender, address _token, bool _redeemable);
event AddedToken(address _sender, address _token, string _symbol, uint _magnitude, bool _loadable, bool _redeemable);
event RemovedToken(address _sender, address _token);
event AddedMethodId(bytes4 _methodId);
event RemovedMethodId(bytes4 _methodId);
event AddedExclusiveMethod(address _token, bytes4 _methodId);
event RemovedExclusiveMethod(address _token, bytes4 _methodId);
event Claimed(address _to, address _asset, uint _amount);
/// @dev these are the methods whitelisted by default in executeTransaction() for protected tokens
bytes4 private constant _APPROVE = 0x095ea7b3; // keccak256(approve(address,uint256)) => 0x095ea7b3
bytes4 private constant _BURN = 0x42966c68; // keccak256(burn(uint256)) => 0x42966c68
bytes4 private constant _TRANSFER= 0xa9059cbb; // keccak256(transfer(address,uint256)) => 0xa9059cbb
bytes4 private constant _TRANSFER_FROM = 0x23b872dd; // keccak256(transferFrom(address,address,uint256)) => 0x23b872dd
struct Token {
string symbol; // Token symbol
uint magnitude; // 10^decimals
uint rate; // Token exchange rate in wei
bool available; // Flags if the token is available or not
bool loadable; // Flags if token is loadable to the TokenCard
bool redeemable; // Flags if token is redeemable in the TKN Holder contract
uint lastUpdate; // Time of the last rate update
}
mapping(address => Token) private _tokenInfoMap;
// @notice specifies whitelisted methodIds for protected tokens in wallet's excuteTranaction() e.g. keccak256(transfer(address,uint256)) => 0xa9059cbb
mapping(bytes4 => bool) private _methodIdWhitelist;
address[] private _tokenAddressArray;
/// @notice keeping track of how many redeemable tokens are in the tokenWhitelist
uint private _redeemableCounter;
/// @notice Address of the stablecoin.
address private _stablecoin;
/// @notice is registered ENS node identifying the oracle contract.
bytes32 private _oracleNode;
/// @notice Constructor initializes ENSResolvable, and Controllable.
/// @param _ens_ is the ENS registry address.
/// @param _oracleNode_ is the ENS node of the Oracle.
/// @param _controllerNode_ is our Controllers node.
/// @param _stablecoinAddress_ is the address of the stablecoint used by the wallet for the card load limit.
constructor(address _ens_, bytes32 _oracleNode_, bytes32 _controllerNode_, address _stablecoinAddress_) ENSResolvable(_ens_) Controllable(_controllerNode_) public {
_oracleNode = _oracleNode_;
_stablecoin = _stablecoinAddress_;
//a priori ERC20 whitelisted methods
_methodIdWhitelist[_APPROVE] = true;
_methodIdWhitelist[_BURN] = true;
_methodIdWhitelist[_TRANSFER] = true;
_methodIdWhitelist[_TRANSFER_FROM] = true;
}
modifier onlyAdminOrOracle() {
address oracleAddress = _ensResolve(_oracleNode);
require (_isAdmin(msg.sender) || msg.sender == oracleAddress, "either oracle or admin");
_;
}
/// @notice Add ERC20 tokens to the list of whitelisted tokens.
/// @param _tokens ERC20 token contract addresses.
/// @param _symbols ERC20 token names.
/// @param _magnitude 10 to the power of number of decimal places used by each ERC20 token.
/// @param _loadable is a bool that states whether or not a token is loadable to the TokenCard.
/// @param _redeemable is a bool that states whether or not a token is redeemable in the TKN Holder Contract.
/// @param _lastUpdate is a unit representing an ISO datetime e.g. 20180913153211.
function addTokens(address[] calldata _tokens, bytes32[] calldata _symbols, uint[] calldata _magnitude, bool[] calldata _loadable, bool[] calldata _redeemable, uint _lastUpdate) external onlyAdmin {
// Require that all parameters have the same length.
require(_tokens.length == _symbols.length && _tokens.length == _magnitude.length && _tokens.length == _loadable.length && _tokens.length == _loadable.length, "parameter lengths do not match");
// Add each token to the list of supported tokens.
for (uint i = 0; i < _tokens.length; i++) {
// Require that the token isn't already available.
require(!_tokenInfoMap[_tokens[i]].available, "token already available");
// Store the intermediate values.
string memory symbol = _symbols[i].toSliceB32().toString();
// Add the token to the token list.
_tokenInfoMap[_tokens[i]] = Token({
symbol : symbol,
magnitude : _magnitude[i],
rate : 0,
available : true,
loadable : _loadable[i],
redeemable: _redeemable[i],
lastUpdate : _lastUpdate
});
// Add the token address to the address list.
_tokenAddressArray.push(_tokens[i]);
//if the token is redeemable increase the redeemableCounter
if (_redeemable[i]){
_redeemableCounter = _redeemableCounter.add(1);
}
// Emit token addition event.
emit AddedToken(msg.sender, _tokens[i], symbol, _magnitude[i], _loadable[i], _redeemable[i]);
}
}
/// @notice Remove ERC20 tokens from the whitelist of tokens.
/// @param _tokens ERC20 token contract addresses.
function removeTokens(address[] calldata _tokens) external onlyAdmin {
// Delete each token object from the list of supported tokens based on the addresses provided.
for (uint i = 0; i < _tokens.length; i++) {
// Store the token address.
address token = _tokens[i];
//token must be available, reverts on duplicates as well
require(_tokenInfoMap[token].available, "token is not available");
//if the token is redeemable decrease the redeemableCounter
if (_tokenInfoMap[token].redeemable){
_redeemableCounter = _redeemableCounter.sub(1);
}
// Delete the token object.
delete _tokenInfoMap[token];
// Remove the token address from the address list.
for (uint j = 0; j < _tokenAddressArray.length.sub(1); j++) {
if (_tokenAddressArray[j] == token) {
_tokenAddressArray[j] = _tokenAddressArray[_tokenAddressArray.length.sub(1)];
break;
}
}
_tokenAddressArray.length--;
// Emit token removal event.
emit RemovedToken(msg.sender, token);
}
}
/// @notice based on the method it returns the recipient address and amount/value, ERC20 specific.
/// @param _data is the transaction payload.
function getERC20RecipientAndAmount(address _token, bytes calldata _data) external view returns (address, uint) {
// Require that there exist enough bytes for encoding at least a method signature + data in the transaction payload:
// 4 (signature) + 32(address or uint256)
require(_data.length >= 4 + 32, "not enough method-encoding bytes");
// Get the method signature
bytes4 signature = _data._bytesToBytes4(0);
// Check if method Id is supported
require(isERC20MethodSupported(_token, signature), "unsupported method");
// returns the recipient's address and amount is the value to be transferred
if (signature == _BURN) {
// 4 (signature) + 32(uint256)
return (_token, _data._bytesToUint256(4));
} else if (signature == _TRANSFER_FROM) {
// 4 (signature) + 32(address) + 32(address) + 32(uint256)
require(_data.length >= 4 + 32 + 32 + 32, "not enough data for transferFrom");
return ( _data._bytesToAddress(4 + 32 + 12), _data._bytesToUint256(4 + 32 + 32));
} else { //transfer or approve
// 4 (signature) + 32(address) + 32(uint)
require(_data.length >= 4 + 32 + 32, "not enough data for transfer/appprove");
return (_data._bytesToAddress(4 + 12), _data._bytesToUint256(4 + 32));
}
}
/// @notice Toggles whether or not a token is loadable or not.
function setTokenLoadable(address _token, bool _loadable) external onlyAdmin {
// Require that the token exists.
require(_tokenInfoMap[_token].available, "token is not available");
// this sets the loadable flag to the value passed in
_tokenInfoMap[_token].loadable = _loadable;
emit UpdatedTokenLoadable(msg.sender, _token, _loadable);
}
/// @notice Toggles whether or not a token is redeemable or not.
function setTokenRedeemable(address _token, bool _redeemable) external onlyAdmin {
// Require that the token exists.
require(_tokenInfoMap[_token].available, "token is not available");
// this sets the redeemable flag to the value passed in
_tokenInfoMap[_token].redeemable = _redeemable;
emit UpdatedTokenRedeemable(msg.sender, _token, _redeemable);
}
/// @notice Update ERC20 token exchange rate.
/// @param _token ERC20 token contract address.
/// @param _rate ERC20 token exchange rate in wei.
/// @param _updateDate date for the token updates. This will be compared to when oracle updates are received.
function updateTokenRate(address _token, uint _rate, uint _updateDate) external onlyAdminOrOracle {
// Require that the token exists.
require(_tokenInfoMap[_token].available, "token is not available");
// Update the token's rate.
_tokenInfoMap[_token].rate = _rate;
// Update the token's last update timestamp.
_tokenInfoMap[_token].lastUpdate = _updateDate;
// Emit the rate update event.
emit UpdatedTokenRate(msg.sender, _token, _rate);
}
//// @notice Withdraw tokens from the smart contract to the specified account.
function claim(address payable _to, address _asset, uint _amount) external onlyAdmin {
_safeTransfer(_to, _asset, _amount);
emit Claimed(_to, _asset, _amount);
}
/// @notice This returns all of the fields for a given token.
/// @param _a is the address of a given token.
/// @return string of the token's symbol.
/// @return uint of the token's magnitude.
/// @return uint of the token's exchange rate to ETH.
/// @return bool whether the token is available.
/// @return bool whether the token is loadable to the TokenCard.
/// @return bool whether the token is redeemable to the TKN Holder Contract.
/// @return uint of the lastUpdated time of the token's exchange rate.
function getTokenInfo(address _a) external view returns (string memory, uint256, uint256, bool, bool, bool, uint256) {
Token storage tokenInfo = _tokenInfoMap[_a];
return (tokenInfo.symbol, tokenInfo.magnitude, tokenInfo.rate, tokenInfo.available, tokenInfo.loadable, tokenInfo.redeemable, tokenInfo.lastUpdate);
}
/// @notice This returns all of the fields for our StableCoin.
/// @return string of the token's symbol.
/// @return uint of the token's magnitude.
/// @return uint of the token's exchange rate to ETH.
/// @return bool whether the token is available.
/// @return bool whether the token is loadable to the TokenCard.
/// @return bool whether the token is redeemable to the TKN Holder Contract.
/// @return uint of the lastUpdated time of the token's exchange rate.
function getStablecoinInfo() external view returns (string memory, uint256, uint256, bool, bool, bool, uint256) {
Token storage stablecoinInfo = _tokenInfoMap[_stablecoin];
return (stablecoinInfo.symbol, stablecoinInfo.magnitude, stablecoinInfo.rate, stablecoinInfo.available, stablecoinInfo.loadable, stablecoinInfo.redeemable, stablecoinInfo.lastUpdate);
}
/// @notice This returns an array of all whitelisted token addresses.
/// @return address[] of whitelisted tokens.
function tokenAddressArray() external view returns (address[] memory) {
return _tokenAddressArray;
}
/// @notice This returns an array of all redeemable token addresses.
/// @return address[] of redeemable tokens.
function redeemableTokens() external view returns (address[] memory) {
address[] memory redeemableAddresses = new address[](_redeemableCounter);
uint redeemableIndex = 0;
for (uint i = 0; i < _tokenAddressArray.length; i++) {
address token = _tokenAddressArray[i];
if (_tokenInfoMap[token].redeemable){
redeemableAddresses[redeemableIndex] = token;
redeemableIndex += 1;
}
}
return redeemableAddresses;
}
/// @notice This returns true if a method Id is supported for the specific token.
/// @return true if _methodId is supported in general or just for the specific token.
function isERC20MethodSupported(address _token, bytes4 _methodId) public view returns (bool) {
require(_tokenInfoMap[_token].available, "non-existing token");
return (_methodIdWhitelist[_methodId]);
}
/// @notice This returns true if the method is supported for all protected tokens.
/// @return true if _methodId is in the method whitelist.
function isERC20MethodWhitelisted(bytes4 _methodId) external view returns (bool) {
return (_methodIdWhitelist[_methodId]);
}
/// @notice This returns the number of redeemable tokens.
/// @return current # of redeemables.
function redeemableCounter() external view returns (uint) {
return _redeemableCounter;
}
/// @notice This returns the address of our stablecoin of choice.
/// @return the address of the stablecoin contract.
function stablecoin() external view returns (address) {
return _stablecoin;
}
/// @notice this returns the node hash of our Oracle.
/// @return the oracle node registered in ENS.
function oracleNode() external view returns (bytes32) {
return _oracleNode;
}
}
contract TokenWhitelistable is ENSResolvable {
/// @notice Is the registered ENS node identifying the tokenWhitelist contract
bytes32 private _tokenWhitelistNode;
/// @notice Constructor initializes the TokenWhitelistable object.
/// @param _tokenWhitelistNode_ is the ENS node of the TokenWhitelist.
constructor(bytes32 _tokenWhitelistNode_) internal {
_tokenWhitelistNode = _tokenWhitelistNode_;
}
/// @notice This shows what TokenWhitelist is being used
/// @return TokenWhitelist's node registered in ENS.
function tokenWhitelistNode() external view returns (bytes32) {
return _tokenWhitelistNode;
}
/// @notice This returns all of the fields for a given token.
/// @param _a is the address of a given token.
/// @return string of the token's symbol.
/// @return uint of the token's magnitude.
/// @return uint of the token's exchange rate to ETH.
/// @return bool whether the token is available.
/// @return bool whether the token is loadable to the TokenCard.
/// @return bool whether the token is redeemable to the TKN Holder Contract.
/// @return uint of the lastUpdated time of the token's exchange rate.
function _getTokenInfo(address _a) internal view returns (string memory, uint256, uint256, bool, bool, bool, uint256) {
return ITokenWhitelist(_ensResolve(_tokenWhitelistNode)).getTokenInfo(_a);
}
/// @notice This returns all of the fields for our stablecoin token.
/// @return string of the token's symbol.
/// @return uint of the token's magnitude.
/// @return uint of the token's exchange rate to ETH.
/// @return bool whether the token is available.
/// @return bool whether the token is loadable to the TokenCard.
/// @return bool whether the token is redeemable to the TKN Holder Contract.
/// @return uint of the lastUpdated time of the token's exchange rate.
function _getStablecoinInfo() internal view returns (string memory, uint256, uint256, bool, bool, bool, uint256) {
return ITokenWhitelist(_ensResolve(_tokenWhitelistNode)).getStablecoinInfo();
}
/// @notice This returns an array of our whitelisted addresses.
/// @return address[] of our whitelisted tokens.
function _tokenAddressArray() internal view returns (address[] memory) {
return ITokenWhitelist(_ensResolve(_tokenWhitelistNode)).tokenAddressArray();
}
/// @notice This returns an array of all redeemable token addresses.
/// @return address[] of redeemable tokens.
function _redeemableTokens() internal view returns (address[] memory) {
return ITokenWhitelist(_ensResolve(_tokenWhitelistNode)).redeemableTokens();
}
/// @notice Update ERC20 token exchange rate.
/// @param _token ERC20 token contract address.
/// @param _rate ERC20 token exchange rate in wei.
/// @param _updateDate date for the token updates. This will be compared to when oracle updates are received.
function _updateTokenRate(address _token, uint _rate, uint _updateDate) internal {
ITokenWhitelist(_ensResolve(_tokenWhitelistNode)).updateTokenRate(_token, _rate, _updateDate);
}
/// @notice based on the method it returns the recipient address and amount/value, ERC20 specific.
/// @param _data is the transaction payload.
function _getERC20RecipientAndAmount(address _destination, bytes memory _data) internal view returns (address, uint) {
return ITokenWhitelist(_ensResolve(_tokenWhitelistNode)).getERC20RecipientAndAmount(_destination, _data);
}
/// @notice Checks whether a token is available.
/// @return bool available or not.
function _isTokenAvailable(address _a) internal view returns (bool) {
( , , , bool available, , , ) = _getTokenInfo(_a);
return available;
}
/// @notice Checks whether a token is redeemable.
/// @return bool redeemable or not.
function _isTokenRedeemable(address _a) internal view returns (bool) {
( , , , , , bool redeemable, ) = _getTokenInfo(_a);
return redeemable;
}
/// @notice Checks whether a token is loadable.
/// @return bool loadable or not.
function _isTokenLoadable(address _a) internal view returns (bool) {
( , , , , bool loadable, , ) = _getTokenInfo(_a);
return loadable;
}
/// @notice This gets the address of the stablecoin.
/// @return the address of the stablecoin contract.
function _stablecoin() internal view returns (address) {
return ITokenWhitelist(_ensResolve(_tokenWhitelistNode)).stablecoin();
}
}
contract ControllableOwnable is Controllable, Ownable {
/// @dev Check if the sender is the Owner or one of the Controllers
modifier onlyOwnerOrController() {
require (_isOwner(msg.sender) || _isController(msg.sender), "either owner or controller");
_;
}
}
/// @title AddressWhitelist provides payee-whitelist functionality.
/// @dev This contract will allow the user to maintain a whitelist of addresses
/// @dev These addresses will live outside of the various spend limits
contract AddressWhitelist is ControllableOwnable {
using SafeMath for uint256;
event AddedToWhitelist(address _sender, address[] _addresses);
event SubmittedWhitelistAddition(address[] _addresses, bytes32 _hash);
event CancelledWhitelistAddition(address _sender, bytes32 _hash);
event RemovedFromWhitelist(address _sender, address[] _addresses);
event SubmittedWhitelistRemoval(address[] _addresses, bytes32 _hash);
event CancelledWhitelistRemoval(address _sender, bytes32 _hash);
mapping(address => bool) public whitelistMap;
address[] public whitelistArray;
address[] private _pendingWhitelistAddition;
address[] private _pendingWhitelistRemoval;
bool public submittedWhitelistAddition;
bool public submittedWhitelistRemoval;
bool public isSetWhitelist;
/// @dev Check if the provided addresses contain the owner or the zero-address address.
modifier hasNoOwnerOrZeroAddress(address[] memory _addresses) {
for (uint i = 0; i < _addresses.length; i++) {
require(!_isOwner(_addresses[i]), "provided whitelist contains the owner address");
require(_addresses[i] != address(0), "provided whitelist contains the zero address");
}
_;
}
/// @dev Check that neither addition nor removal operations have already been submitted.
modifier noActiveSubmission() {
require(!submittedWhitelistAddition && !submittedWhitelistRemoval, "whitelist operation has already been submitted");
_;
}
/// @dev Getter for pending addition array.
function pendingWhitelistAddition() external view returns (address[] memory) {
return _pendingWhitelistAddition;
}
/// @dev Getter for pending removal array.
function pendingWhitelistRemoval() external view returns (address[] memory) {
return _pendingWhitelistRemoval;
}
/// @dev Add initial addresses to the whitelist.
/// @param _addresses are the Ethereum addresses to be whitelisted.
function setWhitelist(address[] calldata _addresses) external onlyOwner hasNoOwnerOrZeroAddress(_addresses) {
// Require that the whitelist has not been initialized.
require(!isSetWhitelist, "whitelist has already been initialized");
// Add each of the provided addresses to the whitelist.
for (uint i = 0; i < _addresses.length; i++) {
// adds to the whitelist mapping
whitelistMap[_addresses[i]] = true;
// adds to the whitelist array
whitelistArray.push(_addresses[i]);
}
isSetWhitelist = true;
// Emit the addition event.
emit AddedToWhitelist(msg.sender, _addresses);
}
/// @dev Add addresses to the whitelist.
/// @param _addresses are the Ethereum addresses to be whitelisted.
function submitWhitelistAddition(address[] calldata _addresses) external onlyOwner noActiveSubmission hasNoOwnerOrZeroAddress(_addresses) {
// Require that the whitelist has been initialized.
require(isSetWhitelist, "whitelist has not been initialized");
// Require this array of addresses not empty
require(_addresses.length > 0, "pending whitelist addition is empty");
// Set the provided addresses to the pending addition addresses.
_pendingWhitelistAddition = _addresses;
// Flag the operation as submitted.
submittedWhitelistAddition = true;
// Emit the submission event.
emit SubmittedWhitelistAddition(_addresses, calculateHash(_addresses));
}
/// @dev Confirm pending whitelist addition.
/// @dev This will only ever be applied post 2FA, by one of the Controllers
/// @param _hash is the hash of the pending whitelist array, a form of lamport lock
function confirmWhitelistAddition(bytes32 _hash) external onlyController {
// Require that the whitelist addition has been submitted.
require(submittedWhitelistAddition, "whitelist addition has not been submitted");
// Require that confirmation hash and the hash of the pending whitelist addition match
require(_hash == calculateHash(_pendingWhitelistAddition), "hash of the pending whitelist addition do not match");
// Whitelist pending addresses.
for (uint i = 0; i < _pendingWhitelistAddition.length; i++) {
// check if it doesn't exist already.
if (!whitelistMap[_pendingWhitelistAddition[i]]) {
// add to the Map and the Array
whitelistMap[_pendingWhitelistAddition[i]] = true;
whitelistArray.push(_pendingWhitelistAddition[i]);
}
}
// Emit the addition event.
emit AddedToWhitelist(msg.sender, _pendingWhitelistAddition);
// Reset pending addresses.
delete _pendingWhitelistAddition;
// Reset the submission flag.
submittedWhitelistAddition = false;
}
/// @dev Cancel pending whitelist addition.
function cancelWhitelistAddition(bytes32 _hash) external onlyOwnerOrController {
// Check if operation has been submitted.
require(submittedWhitelistAddition, "whitelist addition has not been submitted");
// Require that confirmation hash and the hash of the pending whitelist addition match
require(_hash == calculateHash(_pendingWhitelistAddition), "hash of the pending whitelist addition does not match");
// Reset pending addresses.
delete _pendingWhitelistAddition;
// Reset the submitted operation flag.
submittedWhitelistAddition = false;
// Emit the cancellation event.
emit CancelledWhitelistAddition(msg.sender, _hash);
}
/// @dev Remove addresses from the whitelist.
/// @param _addresses are the Ethereum addresses to be removed.
function submitWhitelistRemoval(address[] calldata _addresses) external onlyOwner noActiveSubmission {
// Require that the whitelist has been initialized.
require(isSetWhitelist, "whitelist has not been initialized");
// Require that the array of addresses is not empty
require(_addresses.length > 0, "pending whitelist removal is empty");
// Add the provided addresses to the pending addition list.
_pendingWhitelistRemoval = _addresses;
// Flag the operation as submitted.
submittedWhitelistRemoval = true;
// Emit the submission event.
emit SubmittedWhitelistRemoval(_addresses, calculateHash(_addresses));
}
/// @dev Confirm pending removal of whitelisted addresses.
function confirmWhitelistRemoval(bytes32 _hash) external onlyController {
// Require that the pending whitelist is not empty and the operation has been submitted.
require(submittedWhitelistRemoval, "whitelist removal has not been submitted");
// Require that confirmation hash and the hash of the pending whitelist removal match
require(_hash == calculateHash(_pendingWhitelistRemoval), "hash of the pending whitelist removal does not match the confirmed hash");
// Remove pending addresses.
for (uint i = 0; i < _pendingWhitelistRemoval.length; i++) {
// check if it exists
if (whitelistMap[_pendingWhitelistRemoval[i]]) {
whitelistMap[_pendingWhitelistRemoval[i]] = false;
for (uint j = 0; j < whitelistArray.length.sub(1); j++) {
if (whitelistArray[j] == _pendingWhitelistRemoval[i]) {
whitelistArray[j] = whitelistArray[whitelistArray.length - 1];
break;
}
}
whitelistArray.length--;
}
}
// Emit the removal event.
emit RemovedFromWhitelist(msg.sender, _pendingWhitelistRemoval);
// Reset pending addresses.
delete _pendingWhitelistRemoval;
// Reset the submission flag.
submittedWhitelistRemoval = false;
}
/// @dev Cancel pending removal of whitelisted addresses.
function cancelWhitelistRemoval(bytes32 _hash) external onlyOwnerOrController {
// Check if operation has been submitted.
require(submittedWhitelistRemoval, "whitelist removal has not been submitted");
// Require that confirmation hash and the hash of the pending whitelist removal match
require(_hash == calculateHash(_pendingWhitelistRemoval), "hash of the pending whitelist removal do not match");
// Reset pending addresses.
delete _pendingWhitelistRemoval;
// Reset pending addresses.
submittedWhitelistRemoval = false;
// Emit the cancellation event.
emit CancelledWhitelistRemoval(msg.sender, _hash);
}
/// @dev Method used to hash our whitelist address arrays.
function calculateHash(address[] memory _addresses) public pure returns (bytes32) {
return keccak256(abi.encodePacked(_addresses));
}
}
/// @title DailyLimitTrait This trait allows for daily limits to be included in other contracts.
/// This contract will allow for a DailyLimit object to be instantiated and used.
library DailyLimitTrait {
using SafeMath for uint256;
event UpdatedAvailableLimit();
struct DailyLimit {
uint value;
uint available;
uint limitTimestamp;
uint pending;
bool updateable;
}
/// @dev Returns the available daily balance - accounts for daily limit reset.
/// @return amount of available to spend within the current day in base units.
function _getAvailableLimit(DailyLimit storage self) internal view returns (uint) {
if (now > self.limitTimestamp.add(24 hours)) {
return self.value;
} else {
return self.available;
}
}
/// @dev Use up amount within the daily limit. Will fail if amount is larger than daily limit.
function _enforceLimit(DailyLimit storage self, uint _amount) internal {
// Account for the spend limit daily reset.
_updateAvailableLimit(self);
require(self.available >= _amount, "available has to be greater or equal to use amount");
self.available = self.available.sub(_amount);
}
/// @dev Set the daily limit.
/// @param _amount is the daily limit amount in base units.
function _setLimit(DailyLimit storage self, uint _amount) internal {
// Require that the spend limit has not been set yet.
require(!self.updateable, "daily limit not updateable");
// Modify spend limit based on the provided value.
_modifyLimit(self, _amount);
// Flag the operation as set.
self.updateable = true;
}
/// @dev Submit a daily limit update, needs to be confirmed.
/// @param _amount is the daily limit amount in base units.
function _submitLimitUpdate(DailyLimit storage self, uint _amount) internal {
// Require that the spend limit has been set.
require(self.updateable, "daily limit is still updateable");
// Assign the provided amount to pending daily limit.
self.pending = _amount;
}
/// @dev Confirm pending set daily limit operation.
function _confirmLimitUpdate(DailyLimit storage self, uint _amount) internal {
// Require that pending and confirmed spend limit are the same
require(self.pending == _amount, "confirmed and submitted limits dont match");
// Modify spend limit based on the pending value.
_modifyLimit(self, self.pending);
}
/// @dev Update available spend limit based on the daily reset.
function _updateAvailableLimit(DailyLimit storage self) private {
if (now > self.limitTimestamp.add(24 hours)) {
// Update the current timestamp.
self.limitTimestamp = now;
// Set the available limit to the current spend limit.
self.available = self.value;
emit UpdatedAvailableLimit();
}
}
/// @dev Modify the spend limit and spend available based on the provided value.
/// @dev _amount is the daily limit amount in wei.
function _modifyLimit(DailyLimit storage self, uint _amount) private {
// Account for the spend limit daily reset.
_updateAvailableLimit(self);
// Set the daily limit to the provided amount.
self.value = _amount;
// Lower the available limit if it's higher than the new daily limit.
if (self.available > self.value) {
self.available = self.value;
}
}
}
/// @title it provides daily spend limit functionality.
contract SpendLimit is ControllableOwnable {
event SetSpendLimit(address _sender, uint _amount);
event SubmittedSpendLimitUpdate(uint _amount);
using DailyLimitTrait for DailyLimitTrait.DailyLimit;
DailyLimitTrait.DailyLimit internal _spendLimit;
/// @dev Constructor initializes the daily spend limit in wei.
constructor(uint _limit_) internal {
_spendLimit = DailyLimitTrait.DailyLimit(_limit_, _limit_, now, 0, false);
}
/// @dev Sets the initial daily spend (aka transfer) limit for non-whitelisted addresses.
/// @param _amount is the daily limit amount in wei.
function setSpendLimit(uint _amount) external onlyOwner {
_spendLimit._setLimit(_amount);
emit SetSpendLimit(msg.sender, _amount);
}
/// @dev Submit a daily transfer limit update for non-whitelisted addresses.
/// @param _amount is the daily limit amount in wei.
function submitSpendLimitUpdate(uint _amount) external onlyOwner {
_spendLimit._submitLimitUpdate(_amount);
emit SubmittedSpendLimitUpdate(_amount);
}
/// @dev Confirm pending set daily limit operation.
function confirmSpendLimitUpdate(uint _amount) external onlyController {
_spendLimit._confirmLimitUpdate(_amount);
emit SetSpendLimit(msg.sender, _amount);
}
function spendLimitAvailable() external view returns (uint) {
return _spendLimit._getAvailableLimit();
}
function spendLimitValue() external view returns (uint) {
return _spendLimit.value;
}
function spendLimitUpdateable() external view returns (bool) {
return _spendLimit.updateable;
}
function spendLimitPending() external view returns (uint) {
return _spendLimit.pending;
}
}
//// @title GasTopUpLimit provides daily limit functionality.
contract GasTopUpLimit is ControllableOwnable {
event SetGasTopUpLimit(address _sender, uint _amount);
event SubmittedGasTopUpLimitUpdate(uint _amount);
uint constant private _MINIMUM_GAS_TOPUP_LIMIT = 1 finney;
uint constant private _MAXIMUM_GAS_TOPUP_LIMIT = 500 finney;
using DailyLimitTrait for DailyLimitTrait.DailyLimit;
DailyLimitTrait.DailyLimit internal _gasTopUpLimit;
/// @dev Constructor initializes the daily gas topup limit in wei.
constructor() internal {
_gasTopUpLimit = DailyLimitTrait.DailyLimit(_MAXIMUM_GAS_TOPUP_LIMIT, _MAXIMUM_GAS_TOPUP_LIMIT, now, 0, false);
}
/// @dev Sets the daily gas top up limit.
/// @param _amount is the gas top up amount in wei.
function setGasTopUpLimit(uint _amount) external onlyOwner {
require(_MINIMUM_GAS_TOPUP_LIMIT <= _amount && _amount <= _MAXIMUM_GAS_TOPUP_LIMIT, "gas top up amount is outside the min/max range");
_gasTopUpLimit._setLimit(_amount);
emit SetGasTopUpLimit(msg.sender, _amount);
}
/// @dev Submit a daily gas top up limit update.
/// @param _amount is the daily top up gas limit amount in wei.
function submitGasTopUpLimitUpdate(uint _amount) external onlyOwner {
require(_MINIMUM_GAS_TOPUP_LIMIT <= _amount && _amount <= _MAXIMUM_GAS_TOPUP_LIMIT, "gas top up amount is outside the min/max range");
_gasTopUpLimit._submitLimitUpdate(_amount);
emit SubmittedGasTopUpLimitUpdate(_amount);
}
/// @dev Confirm pending set top up gas limit operation.
function confirmGasTopUpLimitUpdate(uint _amount) external onlyController {
_gasTopUpLimit._confirmLimitUpdate(_amount);
emit SetGasTopUpLimit(msg.sender, _amount);
}
function gasTopUpLimitAvailable() external view returns (uint) {
return _gasTopUpLimit._getAvailableLimit();
}
function gasTopUpLimitValue() external view returns (uint) {
return _gasTopUpLimit.value;
}
function gasTopUpLimitUpdateable() external view returns (bool) {
return _gasTopUpLimit.updateable;
}
function gasTopUpLimitPending() external view returns (uint) {
return _gasTopUpLimit.pending;
}
}
/// @title LoadLimit provides daily load limit functionality.
contract LoadLimit is ControllableOwnable {
event SetLoadLimit(address _sender, uint _amount);
event SubmittedLoadLimitUpdate(uint _amount);
uint constant private _MINIMUM_LOAD_LIMIT = 1 finney;
uint private _maximumLoadLimit;
using DailyLimitTrait for DailyLimitTrait.DailyLimit;
DailyLimitTrait.DailyLimit internal _loadLimit;
/// @dev Sets a daily card load limit.
/// @param _amount is the card load amount in current stablecoin base units.
function setLoadLimit(uint _amount) external onlyOwner {
require(_MINIMUM_LOAD_LIMIT <= _amount && _amount <= _maximumLoadLimit, "card load amount is outside the min/max range");
_loadLimit._setLimit(_amount);
emit SetLoadLimit(msg.sender, _amount);
}
/// @dev Submit a daily load limit update.
/// @param _amount is the daily load limit amount in wei.
function submitLoadLimitUpdate(uint _amount) external onlyOwner {
require(_MINIMUM_LOAD_LIMIT <= _amount && _amount <= _maximumLoadLimit, "card load amount is outside the min/max range");
_loadLimit._submitLimitUpdate(_amount);
emit SubmittedLoadLimitUpdate(_amount);
}
/// @dev Confirm pending set load limit operation.
function confirmLoadLimitUpdate(uint _amount) external onlyController {
_loadLimit._confirmLimitUpdate(_amount);
emit SetLoadLimit(msg.sender, _amount);
}
function loadLimitAvailable() external view returns (uint) {
return _loadLimit._getAvailableLimit();
}
function loadLimitValue() external view returns (uint) {
return _loadLimit.value;
}
function loadLimitUpdateable() external view returns (bool) {
return _loadLimit.updateable;
}
function loadLimitPending() external view returns (uint) {
return _loadLimit.pending;
}
/// @dev initializes the daily load limit.
/// @param _maxLimit is the maximum load limit amount in stablecoin base units.
function _initializeLoadLimit(uint _maxLimit) internal {
_maximumLoadLimit = _maxLimit;
_loadLimit = DailyLimitTrait.DailyLimit(_maximumLoadLimit, _maximumLoadLimit, now, 0, false);
}
}
//// @title Asset store with extra security features.
contract Vault is AddressWhitelist, SpendLimit, ERC165, Transferrable, Balanceable, TokenWhitelistable {
using SafeMath for uint256;
using SafeERC20 for ERC20;
event Received(address _from, uint _amount);
event Transferred(address _to, address _asset, uint _amount);
event BulkTransferred(address _to, address[] _assets);
/// @dev Supported ERC165 interface ID.
bytes4 private constant _ERC165_INTERFACE_ID = 0x01ffc9a7; // solium-disable-line uppercase
/// @dev Constructor initializes the vault with an owner address and spend limit. It also sets up the controllable and tokenWhitelist contracts with the right name registered in ENS.
/// @param _owner_ is the owner account of the wallet contract.
/// @param _transferable_ indicates whether the contract ownership can be transferred.
/// @param _tokenWhitelistNode_ is the ENS node of the Token whitelist.
/// @param _controllerNode_ is the ENS name node of the controller.
/// @param _spendLimit_ is the initial spend limit.
constructor(address payable _owner_, bool _transferable_, bytes32 _tokenWhitelistNode_, bytes32 _controllerNode_, uint _spendLimit_) SpendLimit(_spendLimit_) Ownable(_owner_, _transferable_) Controllable(_controllerNode_) TokenWhitelistable(_tokenWhitelistNode_) public {}
/// @dev Checks if the value is not zero.
modifier isNotZero(uint _value) {
require(_value != 0, "provided value cannot be zero");
_;
}
/// @dev Ether can be deposited from any source, so this contract must be payable by anyone.
function() external payable {
emit Received(msg.sender, msg.value);
}
/// @dev Checks for interface support based on ERC165.
function supportsInterface(bytes4 _interfaceID) external view returns (bool) {
return _interfaceID == _ERC165_INTERFACE_ID;
}
/// @dev This is a bulk transfer convenience function, used to migrate contracts.
/// @notice If any of the transfers fail, this will revert.
/// @param _to is the recipient's address, can't be the zero (0x0) address: transfer() will revert.
/// @param _assets is an array of addresses of ERC20 tokens or 0x0 for ether.
function bulkTransfer(address payable _to, address[] calldata _assets) external onlyOwner {
// check to make sure that _assets isn't empty
require(_assets.length != 0, "asset array should be non-empty");
// This loops through all of the transfers to be made
for (uint i = 0; i < _assets.length; i++) {
uint amount = _balance(address(this), _assets[i]);
// use our safe, daily limit protected transfer
transfer(_to, _assets[i], amount);
}
emit BulkTransferred(_to, _assets);
}
/// @dev Transfers the specified asset to the recipient's address.
/// @param _to is the recipient's address.
/// @param _asset is the address of an ERC20 token or 0x0 for ether.
/// @param _amount is the amount of assets to be transferred in base units.
function transfer(address payable _to, address _asset, uint _amount) public onlyOwner isNotZero(_amount) {
// Checks if the _to address is not the zero-address
require(_to != address(0), "_to address cannot be set to 0x0");
// If address is not whitelisted, take daily limit into account.
if (!whitelistMap[_to]) {
// initialize ether value in case the asset is ETH
uint etherValue = _amount;
// Convert token amount to ether value if asset is an ERC20 token.
if (_asset != address(0)) {
etherValue = convertToEther(_asset, _amount);
}
// Check against the daily spent limit and update accordingly
// Check against the daily spent limit and update accordingly, require that the value is under remaining limit.
_spendLimit._enforceLimit(etherValue);
}
// Transfer token or ether based on the provided address.
_safeTransfer(_to, _asset, _amount);
// Emit the transfer event.
emit Transferred(_to, _asset, _amount);
}
/// @dev Convert ERC20 token amount to the corresponding ether amount.
/// @param _token ERC20 token contract address.
/// @param _amount amount of token in base units.
function convertToEther(address _token, uint _amount) public view returns (uint) {
// Store the token in memory to save map entry lookup gas.
(,uint256 magnitude, uint256 rate, bool available, , , ) = _getTokenInfo(_token);
// If the token exists require that its rate is not zero.
if (available) {
require(rate != 0, "token rate is 0");
// Safely convert the token amount to ether based on the exchange rate.
return _amount.mul(rate).div(magnitude);
}
return 0;
}
}
//// @title Asset wallet with extra security features, gas top up management and card integration.
contract Wallet is ENSResolvable, Vault, GasTopUpLimit, LoadLimit {
using SafeERC20 for ERC20;
using Address for address;
event ToppedUpGas(address _sender, address _owner, uint _amount);
event LoadedTokenCard(address _asset, uint _amount);
event ExecutedTransaction(address _destination, uint _value, bytes _data, bytes _returndata);
event UpdatedAvailableLimit();
string constant public WALLET_VERSION = "2.2.0";
uint constant private _DEFAULT_MAX_STABLECOIN_LOAD_LIMIT = 10000; //10,000 USD
/// @dev Is the registered ENS node identifying the licence contract.
bytes32 private _licenceNode;
/// @dev Constructor initializes the wallet top up limit and the vault contract.
/// @param _owner_ is the owner account of the wallet contract.
/// @param _transferable_ indicates whether the contract ownership can be transferred.
/// @param _ens_ is the address of the ENS registry.
/// @param _tokenWhitelistNode_ is the ENS name node of the Token whitelist.
/// @param _controllerNode_ is the ENS name node of the Controller contract.
/// @param _licenceNode_ is the ENS name node of the Licence contract.
/// @param _spendLimit_ is the initial spend limit.
constructor(address payable _owner_, bool _transferable_, address _ens_, bytes32 _tokenWhitelistNode_, bytes32 _controllerNode_, bytes32 _licenceNode_, uint _spendLimit_) ENSResolvable(_ens_) Vault(_owner_, _transferable_, _tokenWhitelistNode_, _controllerNode_, _spendLimit_) public {
// Get the stablecoin's magnitude.
( ,uint256 stablecoinMagnitude, , , , , ) = _getStablecoinInfo();
require(stablecoinMagnitude > 0, "stablecoin not set");
_initializeLoadLimit(_DEFAULT_MAX_STABLECOIN_LOAD_LIMIT * stablecoinMagnitude);
_licenceNode = _licenceNode_;
}
/// @dev Refill owner's gas balance, revert if the transaction amount is too large
/// @param _amount is the amount of ether to transfer to the owner account in wei.
function topUpGas(uint _amount) external isNotZero(_amount) onlyOwnerOrController {
// Check against the daily spent limit and update accordingly, require that the value is under remaining limit.
_gasTopUpLimit._enforceLimit(_amount);
// Then perform the transfer
owner().transfer(_amount);
// Emit the gas top up event.
emit ToppedUpGas(msg.sender, owner(), _amount);
}
/// @dev Load a token card with the specified asset amount.
/// @dev the amount send should be inclusive of the percent licence.
/// @param _asset is the address of an ERC20 token or 0x0 for ether.
/// @param _amount is the amount of assets to be transferred in base units.
function loadTokenCard(address _asset, uint _amount) external payable onlyOwner {
// check if token is allowed to be used for loading the card
require(_isTokenLoadable(_asset), "token not loadable");
// Convert token amount to stablecoin value.
uint stablecoinValue = convertToStablecoin(_asset, _amount);
// Check against the daily spent limit and update accordingly, require that the value is under remaining limit.
_loadLimit._enforceLimit(stablecoinValue);
// Get the TKN licenceAddress from ENS
address licenceAddress = _ensResolve(_licenceNode);
if (_asset != address(0)) {
ERC20(_asset).safeApprove(licenceAddress, _amount);
ILicence(licenceAddress).load(_asset, _amount);
} else {
ILicence(licenceAddress).load.value(_amount)(_asset, _amount);
}
emit LoadedTokenCard(_asset, _amount);
}
/// @dev This function allows for the owner to send transaction from the Wallet to arbitrary addresses
/// @param _destination address of the transaction
/// @param _value ETH amount in wei
/// @param _data transaction payload binary
function executeTransaction(address _destination, uint _value, bytes calldata _data) external onlyOwner returns (bytes memory) {
// If value is send across as a part of this executeTransaction, this will be sent to any payable
// destination. As a result enforceLimit if destination is not whitelisted.
if (!whitelistMap[_destination]) {
_spendLimit._enforceLimit(_value);
}
// Check if the destination is a Contract and it is one of our supported tokens
if (address(_destination).isContract() && _isTokenAvailable(_destination)) {
// to is the recipient's address and amount is the value to be transferred
address to;
uint amount;
(to, amount) = _getERC20RecipientAndAmount(_destination, _data);
if (!whitelistMap[to]) {
// If the address (of the token contract, e.g) is not in the TokenWhitelist used by the convert method...
// ...then etherValue will be zero
uint etherValue = convertToEther(_destination, amount);
_spendLimit._enforceLimit(etherValue);
}
// use callOptionalReturn provided in SafeERC20 in case the ERC20 method
// returns flase instead of reverting!
ERC20(_destination).callOptionalReturn(_data);
// if ERC20 call completes, return a boolean "true" as bytes emulating ERC20
bytes memory b = new bytes(32);
b[31] = 0x01;
emit ExecutedTransaction(_destination, _value, _data, b);
return b;
}
(bool success, bytes memory returndata) = _destination.call.value(_value)(_data);
require(success, "low-level call failed");
emit ExecutedTransaction(_destination, _value, _data, returndata);
// returns all of the bytes returned by _destination contract
return returndata;
}
/// @return licence contract node registered in ENS.
function licenceNode() external view returns (bytes32) {
return _licenceNode;
}
/// @dev Convert ether or ERC20 token amount to the corresponding stablecoin amount.
/// @param _token ERC20 token contract address.
/// @param _amount amount of token in base units.
function convertToStablecoin(address _token, uint _amount) public view returns (uint) {
// avoid the unnecessary calculations if the token to be loaded is the stablecoin itself
if (_token == _stablecoin()) {
return _amount;
}
uint amountToSend = _amount;
// 0x0 represents ether
if (_token != address(0)) {
// convert to eth first, same as convertToEther()
// Store the token in memory to save map entry lookup gas.
(,uint256 magnitude, uint256 rate, bool available, , , ) = _getTokenInfo(_token);
// require that token both exists in the whitelist and its rate is not zero.
require(available, "token is not available");
require(rate != 0, "token rate is 0");
// Safely convert the token amount to ether based on the exchange rate.
amountToSend = _amount.mul(rate).div(magnitude);
}
// _amountToSend now is in ether
// Get the stablecoin's magnitude and its current rate.
( ,uint256 stablecoinMagnitude, uint256 stablecoinRate, bool stablecoinAvailable, , , ) = _getStablecoinInfo();
// Check if the stablecoin rate is set.
require(stablecoinAvailable, "token is not available");
require(stablecoinRate != 0, "stablecoin rate is 0");
// Safely convert the token amount to stablecoin based on its exchange rate and the stablecoin exchange rate.
return amountToSend.mul(stablecoinMagnitude).div(stablecoinRate);
}
}