Prepare truffle environment

Author: varasev

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.js]
+indent_size = 2

.gitignore

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+node_modules
+build
+mochawesome-report
+coverage
+coverageEnv
+scTopics
+.DS_Store
+coverage.json

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);
+  }
+}

contracts/ValidatorSet.sol

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+pragma solidity ^0.4.25;
+
+
+contract ReportingValidatorSet {
+    struct ValidatorState {
+        uint256 index; // index in the currentValidators
+        bool isValidator; // is this a validator
+    }
+
+    address[] internal currentValidators;
+    mapping(address => ValidatorState) public validatorsState;
+    
+    event InitiateChange(bytes32 indexed parentHash, address[] newSet);
+
+    modifier onlySystem() {
+        require(msg.sender == 0xffffFFFfFFffffffffffffffFfFFFfffFFFfFFfE);
+        _;
+    }
+
+    modifier onlyValidator() {
+        require(validatorsState[msg.sender].isValidator);
+        _;
+    }
+
+    constructor() public {
+        currentValidators.push(address(0x6546ed725e88fa728a908f9ee9d61f50edc40ad6));
+        currentValidators.push(address(0x1a22d96792666863f429a85623e6d4ca173d26ab));
+        currentValidators.push(address(0x4579c2a15651609ec44a5fadeaabfc30943b5949));
+    }
+
+    function finalizeChange() public onlySystem {
+    }
+
+    function reportBenign(address _validator, uint256 _blockNumber)
+        public
+        onlyValidator
+    {
+    }
+
+    function reportMalicious(address _validator, uint256 _blockNumber, bytes _proof)
+        public
+        onlyValidator
+    {
+    }
+
+    function getValidators() public view returns(address[]) {
+        return currentValidators;
+    }
+}

migrations/1_initial_migration.js

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