Initial commit

solidity/Makefile

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+SOLC = /usr/bin/solc
+
+all:
+	$(SOLC) --bin SwapPool.sol --evm-version byzantium | awk 'NR>3' > SwapPool.bin
+	$(SOLC) --abi SwapPool.sol --evm-version byzantium | awk 'NR>3' > SwapPool.json
+	$(SOLC) --metadata SwapPool.sol --evm-version byzantium | awk 'NR>3' > SwapPool.metadata.json
+	truncate -s -1 SwapPool.bin
+
+install: all
+	cp -v *.json ../python/erc20_swap_pool/data/
+	cp -v *.bin ../python/erc20_swap_pool/data/
+

solidity/SwapPool.sol

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+pragma solidity ^0.8.0;
+
+// Author:	Louis Holbrook <dev@holbrook.no> 0826EDA1702D1E87C6E2875121D2E7BB88C2A746
+// SPDX-License-Identifier: AGPL-3.0-or-later
+// File-Version: 1
+// Description: Voting contract using ERC20 tokens as shares
+
+contract SwapPool {
+	address registry;
+	address quoter;
+	uint256 feePpm;
+	address feeAddress;
+	uint256 public totalSupply;
+	mapping ( address => uint256 ) fees;
+	
+	constructor(address _tokenRegistry) {
+		registry = _tokenRegistry;
+	}
+
+	function deposit(address _token, uint256 _value) public {
+		bool r;
+		bytes memory v;
+
+		allowedToken(_token, registry);
+
+		(r, v) = _token.call(abi.encodeWithSignature('transferFrom(address,address,uint256)', msg.sender, this, _value));
+		require(r, "ERR_TOKEN");
+		r = abi.decode(v, (bool));
+		require(r, "ERR_TRANSFER");
+	}
+
+	function getFee(uint256 _value) private view returns (uint256) {
+		uint256 fee;
+		
+		fee = _value * feePpm;
+		fee /= 1000000;
+
+		return fee;
+	}
+
+	function getQuote(address _outToken, address _inToken, uint256 _value) private returns (uint256) {
+		bool r;
+		bytes memory v;
+		uint256 quote;
+
+		if (quoter == address(0x0)) {
+			return _value;
+		}
+
+		(r, v) = quoter.call(abi.encodeWithSignature('valueFor(address,address,uint256)', _outToken, _inToken, _value));
+		require(r, "ERR_QUOTER");
+		quote = abi.decode(v, (uint256));
+		return quote;
+	}
+
+	function withdraw(address _outToken, address _inToken, uint256 _value) public {
+		bool r;
+		bytes memory v;
+		uint256 netValue;
+		uint256 balance;
+		uint256 fee;
+
+		fee = getFee(_value);
+		netValue = _value - fee;
+		netValue = getQuote(_outToken, _inToken, netValue);
+
+		(r, v) = _outToken.call(abi.encodeWithSignature("balanceOf(address)", this));
+		require(r, "ERR_TOKEN");
+		balance = abi.decode(v, (uint256));
+		require(balance >= netValue + fee, "ERR_BALANCE");
+
+		deposit(_inToken, _value);
+
+		(r, v) = _outToken.call(abi.encodeWithSignature('transferFrom(address,address,uint256)', this, msg.sender, netValue));
+		require(r, "ERR_TOKEN");
+		r = abi.decode(v, (bool));
+		require(r, "ERR_TRANSFER");
+		
+		if (feeAddress != address(0)) {
+			fees[_outToken] += fee;
+		}
+	}
+
+	function withdraw(address _token, uint256 _value) public returns (uint256) {
+
+	}
+
+	function allowedToken(address _token, address _registry) private {
+		bool r;
+		bytes memory v;
+
+		if (_registry == address(0)) {
+			return;
+		}
+		
+		(r, v) = _registry.call(abi.encodeWithSignature('have(address)', _token));
+		require(r, "ERR_REGISTRY");
+		r = abi.decode(v, (bool));
+		require(r, "ERR_UNAUTH_TOKEN");
+	}
+}