commit fb79808354134f5fb71bbc497c381272d57b3433
parent 8c033e056ed3862c4085d24fe97ca1cee1df1a8d
Author: lash <dev@holbrook.no>
Date: Thu, 3 Aug 2023 16:52:08 +0100
Add readme
Diffstat:
7 files changed, 59 insertions(+), 8 deletions(-)
diff --git a/README.md b/README.md
@@ -0,0 +1,47 @@
+# erc20-limiter
+
+These smart contract implementations define value limits for tokens by holders.
+
+The contracts satisfy the [CIC TokenLimit](https://git.grassecon.net/cicnet/cic-contracts/#tokenlimit) interface.
+
+
+## Defining limits
+
+The `setLimit(token, value)` method set the limit of `token` that the transaction signer will accept to `value`.
+
+Values are _inclusive_; if `42` is returned, a balance up to and including `42` should be approved.
+
+A limit of `0` means that the "holder" will categorically not accept a token.
+
+
+### Defining limits for others
+
+An alternative `setLimitFor(token, holder, value)` method exists, where the contract `owner` may change the limit for a _smart contract_.
+
+If smart contract capable of transacting against this method itself does so, the result is the same as if that contract called `setLimit()`.
+
+The `owner` for the contract defined and managed according to the [ERC173](https://eips.ethereum.org/EIPS/eip-173) standard.
+
+
+## Honoring limits
+
+Limits will only be honored if integrated into the proper context.
+
+One example of context is to implement a limit check in the `transfer` and `transferFrom` methods of ERC20 tokens.
+
+
+## ACL Index variant
+
+The `LimitIndex.sol` contract variant includes an implementation of the [CIC ACL](https://git.grassecon.net/cicnet/cic-contracts/#acl) interface.
+
+In this case, any non-zero limit of a token for a holder results in a `true` value being returned. Otherwise, `false` is returned.
+
+The `LimitIndex.sol` contract takes a regular `Limit.sol` token address as argument, or more specifically a contract that satisfies this interface:
+
+```
+interface Limiter {
+ function limitOf(address,address) external view returns(uint256);
+ function setLimit(address,uint256) external;
+ function setLimitFor(address,address,uint256) external;
+}
+```
diff --git a/python/erc20_limiter/data/Limiter.bin b/python/erc20_limiter/data/Limiter.bin
@@ -1 +1 @@
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-\ No newline at end of file
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+\ No newline at end of file
diff --git a/python/erc20_limiter/data/Limiter.metadata.json b/python/erc20_limiter/data/Limiter.metadata.json
@@ -1 +1 @@
-{"compiler":{"version":"0.8.19+commit.7dd6d404"},"language":"Solidity","output":{"abi":[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"}],"name":"limitOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimitFor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"Limiter.sol":"Limiter"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"Limiter.sol":{"keccak256":"0xe75d2e061598eaa9bbcb16988fdfa5529bf389ca4e3c0e882dcb410b740c6e99","license":"AGPL-3.0-or-later","urls":["bzz-raw://e19eb2419d10a285b95dbcccc4405d36917f199048e5b32d14c1539c1638933a","dweb:/ipfs/QmZ4haakZYs8LbC9ZxMqGnfa8PrWGp1H4rLtC1rFKG5miS"]}},"version":1}
+{"compiler":{"version":"0.8.19+commit.7dd6d404"},"language":"Solidity","output":{"abi":[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"}],"name":"limitOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimitFor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"Limiter.sol":"Limiter"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"Limiter.sol":{"keccak256":"0x12883f46af450e37bdea27719f8bc194dff663000a2aea7354b0b0a50bc2b8f3","license":"AGPL-3.0-or-later","urls":["bzz-raw://56753e2ca5ae015eb021a214e2325197618a49181a514cfb5383b9dbcd403829","dweb:/ipfs/QmZWQ3Aw8kjYo7v3Nu68HWQpadBA1iqHzM2NJpbAVd97bh"]}},"version":1}
diff --git a/python/erc20_limiter/data/LimiterIndex.bin b/python/erc20_limiter/data/LimiterIndex.bin
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diff --git a/python/erc20_limiter/data/LimiterIndex.metadata.json b/python/erc20_limiter/data/LimiterIndex.metadata.json
@@ -1 +1 @@
-{"compiler":{"version":"0.8.19+commit.7dd6d404"},"language":"Solidity","output":{"abi":[{"inputs":[{"internalType":"address","name":"_holder","type":"address"},{"internalType":"contract Limiter","name":"_limiter","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"have","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"}],"name":"limitOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimitFor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"LimiterIndex.sol":"LimiterTokenRegistry"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"LimiterIndex.sol":{"keccak256":"0xf75e17753d0aa896c0a2c134e4a8c3e4b14aaa86482323bb6add99f455f72a92","license":"AGPL-3.0-or-later","urls":["bzz-raw://6ff6dfefb6c0e6c99e57eaebf43668fc861292765299d8ee01d55ea6e49843c7","dweb:/ipfs/QmTXMTnMuieiZwE1CPDD1MLHwY3JVyCwPwJ4xuuBVcUC5G"]}},"version":1}
+{"compiler":{"version":"0.8.19+commit.7dd6d404"},"language":"Solidity","output":{"abi":[{"inputs":[{"internalType":"address","name":"_holder","type":"address"},{"internalType":"contract Limiter","name":"_limiter","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"have","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"}],"name":"limitOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_holder","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"setLimitFor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"LimiterIndex.sol":"LimiterTokenRegistry"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"LimiterIndex.sol":{"keccak256":"0x9fd0c38e85af9b5c270c9fd05289279487a4d23b7df0a69d58d04cce7cc96b12","license":"AGPL-3.0-or-later","urls":["bzz-raw://b1e085fc05ff9b23e74cbda4cee4f8c69153d9737601ae1735c443735e2bc1d4","dweb:/ipfs/QmbqZmpnped8P1NgiMcTX8tCH9foN1rNDBKSdWL2o9r8Hd"]}},"version":1}
diff --git a/solidity/Limiter.sol b/solidity/Limiter.sol
@@ -26,7 +26,12 @@ contract Limiter {
}
function setLimitFor(address _token, address _holder, uint256 _value) public {
- require(msg.sender == owner || msg.sender == _holder, 'ERR_AXX');
+ uint256 sz;
+ require(msg.sender == owner || msg.sender == _holder, 'ERR_AXX');
+ assembly {
+ sz := extcodesize(_holder)
+ }
+ require(sz > 0, 'ERR_ACCOUNT');
limit[_token][_holder] = _value;
}
diff --git a/solidity/LimiterIndex.sol b/solidity/LimiterIndex.sol
@@ -35,7 +35,6 @@ contract LimiterTokenRegistry {
}
function setLimitFor(address _token, address _holder, uint256 _value) public {
- require(msg.sender == owner || msg.sender == _holder, 'ERR_AXX');
limiter.setLimitFor(_token, _holder, _value);
}
