Initial Commit

.gitignore

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+build/npm-module
+build
+node_modules
+yarn-error.log
+npm-debug.log
+addresses.json
+/.vscode

LICENSE

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+MIT License
+
+Copyright (c) 2017 singnet
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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-# snet-cf-gateway
+# SNET-CF-Gateway Contracts
+
+[![CircleCI](https://circleci.com/gh/singnet/platform-contracts.svg?style=svg)](https://circleci.com/gh/singnet/SNET-CF-Gateway-Contracts)
+
+Includes SingularityNET Crypto to Fiat contracts, migrations, tests
+
+## Contracts
+
+### CryptoToFiat
+* Contract that maintains a Crypto to fiat conversion for Service Providers and AI Developers. Consumers can use this service to convert the AGI received as part if their services utilization.
+
+## Requirements
+* [Node.js](https://github.com/nodejs/node) (8+)
+* [Npm](https://www.npmjs.com/package/npm)
+
+## Install
+
+### Dependencies
+```bash
+npm install
+```
+
+### Compile 
+```bash
+truffle compile
+```
+
+### Test 
+```bash
+truffle test
+```
+
+## Package
+```bash
+npm run package-npm
+```
+
+## Release
+Contract build artifacts are published to NPM: COMING SOON

contracts/CryptoToFiat.sol

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+pragma solidity ^0.4.24;
+
+import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
+import "openzeppelin-solidity/contracts/math/SafeMath.sol";
+
+contract CryptoToFiat {
+
+    using SafeMath for uint256;
+
+    // Owner of the contract
+    address public owner;
+
+    // Configurable Parameters
+    string public AGIPrice; // Price JSON
+    uint256 public minBalance;
+    uint256 public conversionUpperLimit; // Upper limit on the AGI conversion
+    uint256 public txnLimitInBlocks; // Number of blocks to be wait between Transactions
+    address public authorizer; // Authorizer address singing the conversion process
+
+    // To store the last txn Block Number
+    mapping(address => uint256) public lastTxnBlocks;
+
+    // To store the total conversion amount
+    mapping(address => uint256) public totalConvertedAmt;
+
+    //Tokens which have been deposit into the contract
+    mapping (address => uint256) public balances;
+
+    // Address of token contract
+    ERC20 public token;
+
+    // Events
+    event PriceUpdated(string price);
+    event NewOwner(address owner);
+    event ConfigurationUpdate(uint256 minBalance, uint256 conversionUpperLimit, uint256 txnLimitInBlocks);
+    event DepositFunds(address indexed sender, uint256 amount);
+    event WithdrawFunds(address indexed sender, uint256 amount);
+    event TransferFunds(address indexed sender, address indexed receiver, uint256 amount);
+    event ConvertFunds(address indexed sender, address indexed owner, uint256 amount);
+
+    // Modifiers
+    modifier onlyOwner() {
+        require(
+            msg.sender == owner,
+            "Only owner can call this function."
+        );
+        _;
+    }
+
+    constructor (address _token)
+    public
+    {
+        token = ERC20(_token);
+        owner = msg.sender;
+    }
+
+    function deposit(uint256 value) 
+    public
+    returns(bool) 
+    {
+        require(token.transferFrom(msg.sender, this, value), "Unable to transfer token to the contract."); 
+        balances[msg.sender] = balances[msg.sender].add(value);
+        emit DepositFunds(msg.sender, value);
+        return true;
+    }
+
+    function withdraw(uint256 value)
+    public
+    returns(bool)
+    {
+        require(balances[msg.sender] >= value, "Insufficient balance in the contract.");
+        require(token.transfer(msg.sender, value), "Unable to transfer token from the contract.");
+        balances[msg.sender] = balances[msg.sender].sub(value);
+        emit WithdrawFunds(msg.sender, value);
+        return true;
+    }
+
+    function transfer(address receiver, uint256 value)
+    public
+    returns(bool)
+    {
+        require(balances[msg.sender] >= value, "Insufficient balance in the contract");
+        balances[msg.sender] = balances[msg.sender].sub(value);
+        balances[receiver] = balances[receiver].add(value);
+
+        emit TransferFunds(msg.sender, receiver, value);
+        return true;
+    }
+
+    function initiateConversion(uint256 value, uint256 totalClaim, uint8 v, bytes32 r, bytes32 s)
+    public
+    returns(bool)
+    {
+        require(balances[msg.sender] >= value, "Insufficient balance in the contract");
+        require(balances[msg.sender] >= value.add(minBalance), "Minimum balance to be maintained in the contract");
+        require(value <= conversionUpperLimit, "Exceeding the conversion limit");
+        require(lastTxnBlocks[msg.sender] <= block.number.sub(txnLimitInBlocks), "Exceeding the number of transactions in given time");
+        require(totalConvertedAmt[msg.sender].add(value) <= totalClaim, "Exceeding the claims made so far");
+
+        //compose the message which was signed
+        bytes32 message = prefixed(keccak256(abi.encodePacked("__Conversion", this, msg.sender, totalClaim, lastTxnBlocks[msg.sender])));
+
+        // check that the signature is from the authorizer
+        address authAddress = ecrecover(message, v, r, s);
+        require(authAddress == authorizer, "Invalid signature");
+
+        balances[msg.sender] = balances[msg.sender].sub(value);
+        balances[owner] = balances[owner].add(value);
+
+        lastTxnBlocks[msg.sender] = block.number;
+        totalConvertedAmt[msg.sender] = totalConvertedAmt[msg.sender].add(value);
+
+        // This event is monitored to initiate the fiat transfer based on AGIPrice field
+        emit ConvertFunds(msg.sender, owner, value); 
+        return true;
+    }
+
+
+    function updateOwner(address _owner) public onlyOwner {
+       owner = _owner;
+       emit NewOwner(_owner);
+    }
+
+    function updatePrice(string memory _sPrice) public onlyOwner {
+       AGIPrice = _sPrice;
+       emit PriceUpdated(_sPrice);
+    }
+
+   function setConfigurations(address _authorizer, uint256 _minBalance, uint256 _conversionUpperLimit, uint256 _txnLimitInBlocks) public onlyOwner {
+        authorizer = _authorizer;
+        minBalance = _minBalance;
+        conversionUpperLimit = _conversionUpperLimit;
+        txnLimitInBlocks = _txnLimitInBlocks;
+        emit ConfigurationUpdate(_minBalance, _conversionUpperLimit, _txnLimitInBlocks);
+    }
+
+    /// builds a prefixed hash to mimic the behavior of ethSign.
+    function prefixed(bytes32 hash) internal pure returns (bytes32) 
+    {
+        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
+    }
+
+}

contracts/Migrations.sol

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+pragma solidity ^0.4.23;
+
+contract Migrations {
+  address public owner;
+  uint public last_completed_migration;
+
+  constructor() public {
+    owner = msg.sender;
+  }
+
+  modifier restricted() {
+    if (msg.sender == owner) _;
+  }
+
+  function setCompleted(uint completed) public restricted {
+    last_completed_migration = completed;
+  }
+
+  function upgrade(address new_address) public restricted {
+    Migrations upgraded = Migrations(new_address);
+    upgraded.setCompleted(last_completed_migration);
+  }
+}

migrations/1_initial_migration.js

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+let Migrations = artifacts.require("./Migrations.sol");
+
+module.exports = function(deployer) {
+	deployer.deploy(Migrations);
+};

migrations/2_CryptoToFiat.js

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+let CryptoToFiat = artifacts.require("./CryptoToFiat.sol");
+let Contract = require("truffle-contract");
+let TokenAbi = require("singularitynet-token-contracts/abi/SingularityNetToken.json");
+let TokenNetworks = require("singularitynet-token-contracts/networks/SingularityNetToken.json");
+let TokenBytecode = require("singularitynet-token-contracts/bytecode/SingularityNetToken.json");
+let Token = Contract({contractName: "SingularityNetToken", abi: TokenAbi, networks: TokenNetworks, bytecode: TokenBytecode});
+
+module.exports = function(deployer, network, accounts) {
+    Token.setProvider(web3.currentProvider)
+    Token.defaults({from: accounts[0], gas: 4000000});
+    deployer.deploy(Token, {overwrite: false}).then((TokenInstance) => deployer.deploy(CryptoToFiat, TokenInstance.address));
+};