Updated and standardised the contracts.

contracts/ProxyRegistry.sol

@@ -3,29 +3,63 @@ pragma solidity ^0.5.0;
 import "./UserProxy.sol";
 
 
-contract ProxyRegistry {
+// checking if the logic proxy is authorised
-    event Created(address indexed sender, address indexed owner, address proxy);
+contract SystemAdmin {
-    mapping(address => UserProxy) public proxies;
-    address public logicProxyAddr;
 
-    constructor(address logicProxyAddr_) public {
+    address public logicProxyAddr;
-        logicProxyAddr = logicProxyAddr_;
+    
+    modifier isAdmin() {
+        require(msg.sender == getAdmin(), "permission-denied");
+        _;
     }
 
-    function build(uint activeDays) public returns (UserProxy proxy) {
+    function getAdmin() internal view returns (address) {
-        proxy = build(msg.sender, activeDays);
+        AddressRegistryInterface registry = AddressRegistryInterface(logicProxyAddr);
+        return registry.getAddress("admin");
+    }
+
+}
+
+
+contract ProxyRegistry is SystemAdmin {
+    
+    event Created(address indexed sender, address indexed owner, address proxy);
+    
+    mapping(address => UserProxy) public proxies;
+    bool public guardianEnabled;
+
+    constructor(address _logicProxyAddr) public {
+        logicProxyAddr = _logicProxyAddr;
+    }
+
+    function build() public returns (UserProxy proxy) {
+        proxy = build(msg.sender);
     }
 
     // deploys a new proxy instance and sets custom owner of proxy
-    function build(address owner, uint activeDays) public returns (UserProxy proxy) {
+    function build(address owner) public returns (UserProxy proxy) {
         require(
-            proxies[owner] == UserProxy(0) || proxies[owner].owner() != owner, 
+            proxies[owner] == UserProxy(0) || proxies[owner].owner() != owner,
             "multiple-proxy-per-user-not-allowed"
         ); // Not allow new proxy if the user already has one and remains being the owner
-        
+        proxy = new UserProxy(owner, logicProxyAddr);
-        proxy = new UserProxy(logicProxyAddr, activeDays);
         emit Created(msg.sender, owner, address(proxy));
-        proxy.setOwner(owner);
         proxies[owner] = proxy;
     }
-}
+
+    // msg.sender should always be proxies created via this contract for successful execution
+    function updateProxyRecord(address currentOwner, address nextOwner) public {
+        require(msg.sender == address(proxies[currentOwner]), "invalid-proxy-or-owner");
+        proxies[nextOwner] = proxies[currentOwner];
+        proxies[currentOwner] = UserProxy(0);
+    }
+
+    function enableGuardian() public isAdmin {
+        guardianEnabled = true;
+    }
+
+    function disableGuardian() public isAdmin {
+        guardianEnabled = false;     
+    }
+
+}

contracts/UserProxy.sol

@@ -9,48 +9,99 @@ library SafeMath {
     }
 }
 
+/**
+ * @title ProxyRegistry Interface 
+ */
+interface ProxyRegistryInterface {
+    function updateProxyRecord(address currentOwner, address nextOwner) external;
+    function guardianEnabled() external returns (bool);
+}
 
-contract UserAuth {
+/**
+ * @title AddressRegistryInterface Interface 
+ */
+interface AddressRegistryInterface {
+    function getLogic(address logicAddr) external view returns (bool);
+    function getAddress(string calldata name) external view returns(address);
+}
+
+
+/**
+ * @title Proxy Record
+ */
+contract ProxyRecord {
+    
+    address public proxyContract;
+    
+    /**
+     * @dev this updates the internal proxy ownership on "proxy registry" contract
+     * @param currentOwner is the current owner
+     * @param nextOwner is the new assigned owner
+     */
+    function setProxyRecordOwner(address currentOwner, address nextOwner) internal {
+        ProxyRegistryInterface initCall = ProxyRegistryInterface(proxyContract);
+        initCall.updateProxyRecord(currentOwner, nextOwner);
+    }
+
+}
+
+/**
+ * @title User Auth
+ */
+contract UserAuth is ProxyRecord {
     using SafeMath for uint;
     using SafeMath for uint256;
 
-    event LogSetOwner(address indexed owner, bool isGuardian);
+    event LogSetOwner(address indexed owner, address setter);
-    event LogSetGuardian(address indexed guardian);
+    event LogSetPendingOwner(address indexed pendingOwner, address setter);
-
-    mapping(uint => address) public guardians;
     address public owner;
-    uint public lastActivity; // timestamp
+    address public pendingOwner;
-    // guardians can set owner after owner stay inactive for certain period
+    uint public claimOnwershipTime; // 7 days
-    uint public activePeriod; // timestamp
 
+    /**
+     * @dev defines the "proxy registry" contract and sets the owner
+     */
     constructor() public {
+        proxyContract = msg.sender;
         owner = msg.sender;
-        emit LogSetOwner(msg.sender, false);
+        emit LogSetOwner(owner, msg.sender);
     }
 
+    /**
+     * @dev Throws if not called by owner or contract itself
+     */
     modifier auth {
         require(isAuth(msg.sender), "permission-denied");
         _;
     }
 
-    function setOwner(address owner_) public auth {
+    /**
-        owner = owner_;
+     * @dev sets the "pending owner"
-        emit LogSetOwner(owner, false);
+     * @param nextOwner is the assigned "pending owner"
+     */
+    function setPendingOwner(address nextOwner) public auth {
+        require(block.timestamp > claimOnwershipTime, "owner-is-still-pending");
+        pendingOwner = nextOwner;
+        claimOnwershipTime = block.timestamp.add(7 days);
+        emit LogSetPendingOwner(nextOwner, msg.sender);
     }
 
-    function setOwnerViaGuardian(address owner_, uint num) public {
+    /**
-        require(msg.sender == guardians[num], "permission-denied");
+     * @dev sets "pending owner" as real owner
-        require(block.timestamp > lastActivity.add(activePeriod), "active-period-not-over");
+     * Throws if called before 7 day after assigning "pending owner"
-        owner = owner_;
+     */
-        emit LogSetOwner(owner, true);
+    function setOwner() public {
-    }
+        require(pendingOwner != address(0), "no-pending-address");
-
+        setProxyRecordOwner(owner, pendingOwner);
-    function setGuardian(uint num, address guardian_) public auth {
+        owner = pendingOwner;
-        require(num > 0 && num < 6, "guardians-cant-exceed-five");
+        pendingOwner = address(0);
-        guardians[num] = guardian_;
+        emit LogSetOwner(owner, msg.sender);
-        emit LogSetGuardian(guardian_);
     }
 
+    /**
+     * @dev checks if called by owner or contract itself
+     * @param src is the address initiating the call
+     */
     function isAuth(address src) internal view returns (bool) {
         if (src == address(this)) {
             return true;
@@ -60,9 +111,69 @@ contract UserAuth {
             return false;
         }
     }
+
 }
 
+/**
+ * @title User Guardians
+ */
+contract UserGuardian is UserAuth {
 
+    event LogSetGuardian(address indexed guardian);
+    event LogNewActivePeriod(uint newActivePeriod);
+    event LogSetOwnerViaGuardian(address nextOwner, address indexed guardian);
+
+    mapping(uint => address) public guardians;
+    uint public lastActivity; // time when called "execute" last time
+    uint public activePeriod; // the period over lastActivity when guardians have no rights
+
+    /**
+     * @dev Throws if guardians not enabled by system admin
+     */
+    modifier guard() {
+        ProxyRegistryInterface initCall = ProxyRegistryInterface(proxyContract);
+        require(initCall.guardianEnabled());
+        _;
+    }
+
+    /**
+     * @dev guardians can set "owner" after owner stay inactive for minimum "activePeriod"
+     * @param nextOwner is the new owner
+     * @param num is the assigned guardian number
+     */
+    function setOwnerViaGuardian(address nextOwner, uint num) public guard {
+        require(msg.sender == guardians[num], "permission-denied");
+        require(block.timestamp > lastActivity.add(activePeriod), "active-period-not-over");
+        owner = nextOwner;
+        emit LogSetOwnerViaGuardian(nextOwner, guardians[num]);
+    }
+
+    /**
+     * @dev sets the guardian with assigned number (upto 3)
+     * @param num is the guardian assigned number
+     * @param _guardian is the new guardian address
+     */
+    function setGuardian(uint num, address _guardian) public auth guard {
+        require(num > 0 && num < 4, "guardians-cant-exceed-three");
+        guardians[num] = _guardian;
+        emit LogSetGuardian(_guardian);
+    }
+
+    /**
+     * @dev sets the guardian with assigned number (upto 3)
+     * @param num is the guardian assigned number
+     * @param _guardian is the new guardian address
+     */
+    function updateActivePeriod(uint _activePeriod) public auth guard {
+        activePeriod = _activePeriod;
+        emit LogNewActivePeriod(_activePeriod);
+    }
+
+}
+
+/**
+ * @dev logging the execute events
+ */
 contract UserNote {
     event LogNote(
         bytes4 indexed sig,
@@ -93,27 +204,23 @@ contract UserNote {
 }
 
 
-interface AddressRegistry {
-    function getLogic(address logicAddr) external view returns (bool);
-}
-
-
 // checking if the logic proxy is authorised
 contract UserLogic {
     address public logicProxyAddr;
     function isLogicAuthorised(address logicAddr) internal view returns (bool) {
-        AddressRegistry logicProxy = AddressRegistry(logicProxyAddr);
+        AddressRegistryInterface logicProxy = AddressRegistryInterface(logicProxyAddr);
         return logicProxy.getLogic(logicAddr);
     }
 }
 
 
+contract UserProxy is UserGuardian, UserNote, UserLogic {
 
-contract UserProxy is UserAuth, UserNote, UserLogic {
+    constructor(address _owner, address _logicProxyAddr) public {
-    constructor(address _logicProxyAddr, uint _activePeriod) public {
         logicProxyAddr = _logicProxyAddr;
         lastActivity = block.timestamp;
-        activePeriod = _activePeriod;
+        activePeriod = 30 days; // default and changeable
+        owner = _owner;
     }
 
     function() external payable {}
@@ -139,4 +246,5 @@ contract UserProxy is UserAuth, UserNote, UserLogic {
                 }
         }
     }
+
 }