ERC-6123: Move to Draft: Enlarged interface, streamlined reference im…

…plementation. (#25) * Revised version of ERC-6123 including reference implementation for OTC-Derivatives and according Unit Tests * Revised Doc, renamed SDC in SDCAbstract * Revised Readme * Changed Status to "DRAFT" - here we go again. * Fixed some typos. * Fixed some typos. * Fixed typos. Fixed typo in file name. * Removed unused variables. * Reverted named change. Refactor rename SDCAbstract to SDC * Changed the instruction to run out-of-the-box (clean checkout) wit * Used view, where possible. Used local variable. * Commenting our unused parameter. * Fixed reference to image. Fixed blank lines after headlines. * Fixed blank lines before code. * Fixed headline (duplicate/wrong). * Added note on NPM version numbers. * Used ERC-20 in place of EIP-20 * Added abstract. Used Specification as headline. * Fixed link to eip-20.md * Minor fixed to README.md * Minor fixes to README.md * Simplified instruction to run unit tests, added package.json and hardhat.config.js * Simplified instruction to run unit tests, added package.json and hardhat.config.js * Removed duplicated resulted from manual merge with new ERC repo. * Fixed link: eip-20.md -> erc-20.md * Fixed Bug in SDCPledgedBalance.sol (afterTransfer), minor rewriting in markdown doc. * Minor fixes (typos). * Linking to eip instead of erc (see remark 7 ii on migrating pull requests to ERC repo). * Linking to eip instead of erc (see remark 7 ii on migrating pull requests to ERC repo). * Removed external link upon request. * Update ERCS/erc-6123.md Co-authored-by: Sam Wilson <[email protected]> * Update ERCS/erc-6123.md Co-authored-by: Sam Wilson <[email protected]> * Update ERCS/erc-6123.md Co-authored-by: Sam Wilson <[email protected]> --------- Co-authored-by: Peter KL <[email protected]> Co-authored-by: Sam Wilson <[email protected]>
ethereum · Dec 11, 2023 · d52e58e · d52e58e
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diff --git a/ERCS/erc-6123.md b/ERCS/erc-6123.md
diff --git a/assets/erc-6123/README.md b/assets/erc-6123/README.md
@@ -1,47 +1,47 @@
 # SDC Solidity implementation
 
 ## Description
-This sdc implementation aims to implement process logic in a very lean way using an integrative solidity implementation and according unit tests
+
+The reference SDC implementation can be unit tested with Hardhat to understand the trade process logic.
+
+### Compile and run tests with Hardhat
+
+We provide the essential steps to compile the contracts and run the provided unit tests.
 
 ### Provided Contracts and Tests
+
 - `contracts/ISDC.sol` - Interface contract
-- `contracts/SDC.sol` - SDC reference implementation contract
-- `contracts/SDCToken.sol` - Mintable token contract for unit tests
-- `test/SDC.js` - Unit tests for livecycle of sdc implementation 
+- `contracts/SDC.sol` - SDC abstract contract for an OTC Derivative
+- `contracts/SDCPledgedBalance.sol` - SDC full implementation for an OTC Derivative
+- `contracts/IERC20Settlement.sol` - Interface (extending the ERC-20) for settlement tokens used in `SDCPledgedBalance`.
+- `contracts/ERC20Settlement.sol` - Mintable settlement token contract implementing `IERC20Settlement` for unit tests
+- `test/SDCTests.js` - Unit tests for the life-cycle of the sdc implementation
 
-### Used javascript based testing libraries for solidity
-- `ethereum-waffle`: Waffle is a Solidity testing library. It allows you to write tests for your contracts with JavaScript.
-- `chai`: Chai is an assertion library and provides functions like expect.
-- `ethers`: This is a popular Ethereum client library. It allows you to interface with blockchains that implement the Ethereum API.
-- `solidity-coverage`: This library gives you coverage reports on unit tests with the help of Istanbul.
+### Compile and run tests with Hardhat
 
-### Compile and run tests with hardhat
-We provide the essential steps to compile the contracts and run provided unit tests
-Check that you have the latest version of npm and node via `npm -version` (should be better than 8.5.0) and `node -v` (should be better than 16.14.2).
-
-1. Check out project
-2. Go to folder and initialise a new npm project: `npm init -y`. A basic `package.json` file should occur
-3. Install Hardhat as local solidity dev environment: `npx hardhat`
-4. Select following option: Create an empty hardhat.config.js
-5. Install Hardhat as a development dependency: `npm install --save-dev hardhat`
-6. Install further testing dependencies:
-`npm install --save-dev @nomiclabs/hardhat-waffle @nomiclabs/hardhat-ethers ethereum-waffle chai  ethers solidity-coverage`
-7. Install open zeppelin contracts: `npm install @openzeppelin/contracts`
-8. add plugins to hardhat.config.ts: 
+Install dependencies:
+```shell
+npm i
 ```
-require("@nomiclabs/hardhat-waffle"); 
-require('solidity-coverage');
+
+Run all tests:
+```shell
+npm test
 ```
 
-9. Adding commands to `package.json`:
-``` 
-"scripts": {
-    "build": "hardhat compile",
-    "test:light": "hardhat test",
-    "test": "hardhat coverage"
-  },
+Run all tests with coverage (alternatively):
+```shell
+npm run coverage
 ```
-9. run `npm run build`
-10. run `npm run test`
 
+### Configuration files
+
+- `package.js` - Javascript package definition.
+- `hardhat.config.js` - Hardhat config.
 
+### Used javascript-based testing libraries for solidity
+
+- `ethereum-waffle`: Waffle is a Solidity testing library. It allows you to write tests for your contracts with JavaScript.
+- `chai`: Chai is an assertion library and provides functions like expect.
+- `ethers`: This is a popular Ethereum client library. It allows you to interface with blockchains that implement the Ethereum API.
+- `solidity-coverage`: This library gives you coverage reports on unit tests with the help of Istanbul.
diff --git a/assets/erc-6123/contracts/ERC20Settlement.sol b/assets/erc-6123/contracts/ERC20Settlement.sol
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: CC0-1.0
+pragma solidity >=0.7.0 <0.9.0;
+
+import "./ISDC.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/utils/introspection/ERC165Checker.sol";
+import "./IERC20Settlement.sol";
+
+contract ERC20Settlement is ERC20, IERC20Settlement{
+
+/*------------------------------------------- DESCRIPTION ---------------------------------------------------------------------------------------
+* @title Reference (example) Implementation for Settlement Token Interface
+* @dev This token performs transfers on-chain.
+* Token is tied to one SDC address
+* Only SDC can call checkedTransfers
+* Settlement Token calls back the referenced SDC by calling "afterTransfer" with a success flag. Depending on this SDC perfoms next state change
+*/
+
+
+    modifier onlySDC() {
+        require(msg.sender == sdcAddress, "Only allowed to be called from SDC Address"); _;
+    }
+
+    using ERC165Checker for address;
+
+    address sdcAddress;
+
+    constructor() ERC20("SDCToken", "SDCT") {
+
+    }
+
+    function setSDCAddress(address _sdcAddress) public{
+        sdcAddress = _sdcAddress;
+    }
+
+    function mint(address to, uint256 amount) public {
+        _mint(to, amount);
+    }
+
+    function checkedTransfer(address to, uint256 value, uint256 transactionID) public onlySDC{
+        try this.transfer(to,value) returns (bool transferSuccessFlag) {
+            ISDC(sdcAddress).afterTransfer(transactionID, transferSuccessFlag);
+        }
+        catch{
+            ISDC(sdcAddress).afterTransfer(transactionID, false);
+        }
+    }
+
+    function checkedTransferFrom(address from, address to, uint256 value, uint256 transactionID) external onlySDC {
+        // TODO: Bug - reason="Error: Transaction reverted: contract call run out of gas and made the transaction revert", method="estimateGas",
+        if (this.balanceOf(from)< value || this.allowance(from,address(msg.sender)) < value )
+            ISDC(sdcAddress).afterTransfer(transactionID, false);
+        try this.transfer(to,value) returns (bool transferSuccessFlag) {
+            ISDC(sdcAddress).afterTransfer(transactionID, transferSuccessFlag);
+        }
+        catch{
+            ISDC(sdcAddress).afterTransfer(transactionID, false);
+        }
+        // address owner = _msgSender();    // currently not used
+    }
+
+    function checkedBatchTransfer(address[] memory to, uint256[] memory values, uint256 transactionID ) public onlySDC{
+        require (to.length == values.length, "Array Length mismatch");
+        uint256 requiredBalance = 0;
+        for(uint256 i = 0; i < values.length; i++)
+            requiredBalance += values[i];
+        if (balanceOf(msg.sender) < requiredBalance){
+            ISDC(sdcAddress).afterTransfer(transactionID, false);
+            return;
+        }
+        else{
+            for(uint256 i = 0; i < to.length; i++){
+                transfer(to[i],values[i]);
+            }
+            ISDC(sdcAddress).afterTransfer(transactionID, true);
+        }
+    }
+
+
+    function checkedBatchTransferFrom(address[] memory from, address[] memory to, uint256[] memory values, uint256 transactionID ) public onlySDC{
+        require (from.length == to.length, "Array Length mismatch");
+        require (to.length == values.length, "Array Length mismatch");
+        for(uint256 i = 0; i < from.length; i++){
+            address fromAddress = from[i];
+            uint256 totalRequiredBalance = 0;
+            for(uint256 j = 0; j < from.length; j++){
+                if (from[j] == fromAddress)
+                    totalRequiredBalance += values[j];
+            }
+            if (balanceOf(fromAddress) <  totalRequiredBalance){
+                ISDC(sdcAddress).afterTransfer(transactionID, false);
+                break;
+            }
+
+        }
+        for(uint256 i = 0; i < to.length; i++){
+            transferFrom(from[i],to[i],values[i]);
+        }
+        ISDC(sdcAddress).afterTransfer(transactionID, true);
+    }
+
+}
diff --git a/assets/erc-6123/contracts/IERC20Settlement.sol b/assets/erc-6123/contracts/IERC20Settlement.sol
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: CC0-1.0
+pragma solidity >=0.7.0 <0.9.0;
+
+
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+/*------------------------------------------- DESCRIPTION ---------------------------------------------------------------------------------------
+ * @title ERC6123 - Settlement Token Interface
+ * @dev Settlement Token Interface enhances the ERC20 Token by introducing so called checked transfer functionality which can be used to directly interact with an SDC.
+ * Checked transfers can be conducted for single or multiple transactions where SDC will receive a success message whether the transfer was executed successfully or not.
+ */
+
+
+interface IERC20Settlement is IERC20 {
+
+    /*
+     * @dev Performs a single transfer from msg.sender balance and checks whether this transfer can be conducted
+     * @param to - receiver
+     * @param value - transfer amount
+     * @param transactionID
+     */
+    function checkedTransfer(address to, uint256 value, uint256 transactionID) external;
+
+    /*
+     * @dev Performs a single transfer to a single addresss and checks whether this transfer can be conducted
+     * @param from - payer
+     * @param to - receiver
+     * @param value - transfer amount
+     * @param transactionID
+     */
+    function checkedTransferFrom(address from, address to, uint256 value, uint256 transactionID) external ;
+
+
+    /*
+     * @dev Performs a multiple transfers from msg.sender balance and checks whether these transfers can be conducted
+     * @param to - receivers
+     * @param values - transfer amounts
+     * @param transactionID
+     */
+    function checkedBatchTransfer(address[] memory to, uint256[] memory values, uint256 transactionID ) external;
+
+    /*
+     * @dev Performs a multiple transfers between multiple addresses and checks whether these transfers can be conducted
+     * @param from - payers
+     * @param to - receivers
+     * @param value - transfer amounts
+     * @param transactionID
+     */
+    function checkedBatchTransferFrom(address[] memory from, address[] memory to, uint256[] memory values, uint256 transactionID ) external;
+
+
+}