Modernize codebase: Update Solidity to 0.8.20, Web3.js to v4, and add…

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: [ master, main ]
+  pull_request:
+    branches: [ master, main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Use Node.js 18.x
+      uses: actions/setup-node@v3
+      with:
+        node-version: 18.x
+
+    - name: Install Truffle
+      run: npm install -g truffle
+
+    - name: Install dependencies (Auction DApp Backend)
+      working-directory: code/auction_dapp/backend
+      run: npm install
+
+    - name: Compile Contracts (Auction DApp Backend)
+      working-directory: code/auction_dapp/backend
+      run: truffle compile

code/OpenZeppelin/contracts/SampleCrowdsale.sol

@@ -1,4 +1,8 @@
-pragma solidity 0.4.23;
+pragma solidity ^0.8.20;
+
+// NOTE: Crowdsale contracts were removed from OpenZeppelin Contracts 4.x.
+// This example serves as a reference for the book content but requires 
+// specific legacy libraries or a custom implementation to compile.
 
 import './SampleToken.sol';
 import 'openzeppelin-solidity/contracts/crowdsale/emission/MintedCrowdsale.sol';
@@ -8,7 +12,7 @@ contract SampleCrowdsale is PostDeliveryCrowdsale, MintedCrowdsale {
 
   constructor(
     uint256 _openingTime,
-    uint256 _closingTime
+    uint256 _closingTime,
     uint256 _rate,
     address _wallet,
     MintableToken _token
@@ -19,3 +23,4 @@ contract SampleCrowdsale is PostDeliveryCrowdsale, MintedCrowdsale {
   {
   }
 }
+}

code/OpenZeppelin/contracts/SampleToken.sol

@@ -1,9 +1,12 @@
-pragma solidity 0.4.23;
+pragma solidity ^0.8.20;
 
-import 'openzeppelin-solidity/contracts/token/ERC20/MintableToken.sol';
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
 
-contract SampleToken is MintableToken {
-  string public name = "SAMPLE TOKEN";
-  string public symbol = "SAM";
-  uint8 public decimals = 18;
+contract SampleToken is ERC20, Ownable {
+  constructor() ERC20("SAMPLE TOKEN", "SAM") Ownable(msg.sender) {}
+
+  function mint(address to, uint256 amount) public onlyOwner {
+    _mint(to, amount);
+  }
 }

code/Solidity/Faucet.sol

@@ -1,4 +1,5 @@
-// Our first contract is a faucet!
+pragma solidity ^0.8.20;
+
 contract Faucet {
 
     // Give out ether to anyone who asks
@@ -8,10 +9,10 @@ contract Faucet {
         require(withdraw_amount <= 100000000000000000);
 
         // Send the amount to the address that requested it
-        msg.sender.transfer(withdraw_amount);
+        payable(msg.sender).transfer(withdraw_amount);
     }
 
     // Accept any incoming amount
-    function () public payable {}
+    receive() external payable {}
 
 }

code/Solidity/Faucet2.sol

@@ -1,5 +1,5 @@
 // Version of Solidity compiler this program was written for
-pragma solidity ^0.4.19;
+pragma solidity ^0.8.20;
 
 // Our first contract is a faucet!
 contract Faucet {
@@ -11,10 +11,10 @@ contract Faucet {
         require(withdraw_amount <= 100000000000000000);
 
         // Send the amount to the address that requested it
-        msg.sender.transfer(withdraw_amount);
+        payable(msg.sender).transfer(withdraw_amount);
     }
 
     // Accept any incoming amount
-    function () public payable {}
+    receive() external payable {}
 
 }

code/Solidity/Faucet3.sol

@@ -1,5 +1,5 @@
 // Version of Solidity compiler this program was written for
-pragma solidity ^0.4.22;
+pragma solidity ^0.8.20;
 
 // Our first contract is a faucet!
 contract Faucet {
@@ -14,7 +14,7 @@ contract Faucet {
 	// Contract destructor
 	function destroy() public {
 		require(msg.sender == owner);
-		selfdestruct(owner);
+		selfdestruct(payable(owner));
 	}
 
     // Give out ether to anyone who asks
@@ -24,10 +24,10 @@ contract Faucet {
 		require(withdraw_amount <= 0.1 ether);
 
         // Send the amount to the address that requested it
-        msg.sender.transfer(withdraw_amount);
+        payable(msg.sender).transfer(withdraw_amount);
     }
 
     // Accept any incoming amount
-    function () public payable {}
+    receive() external payable {}
 
 }

code/Solidity/Faucet4.sol

@@ -1,5 +1,5 @@
 // Version of Solidity compiler this program was written for
-pragma solidity ^0.4.22;
+pragma solidity ^0.8.20;
 
 // Our first contract is a faucet!
 contract Faucet {
@@ -19,7 +19,7 @@ contract Faucet {
 
 	// Contract destructor
 	function destroy() public onlyOwner {
-		selfdestruct(owner);
+		selfdestruct(payable(owner));
 	}
 
     // Give out ether to anyone who asks
@@ -29,10 +29,10 @@ contract Faucet {
 		require(withdraw_amount <= 0.1 ether);
 
         // Send the amount to the address that requested it
-        msg.sender.transfer(withdraw_amount);
+        payable(msg.sender).transfer(withdraw_amount);
     }
 
     // Accept any incoming amount
-    function () public payable {}
+    receive() external payable {}
 
 }

code/Solidity/Faucet5.sol

@@ -1,5 +1,5 @@
 // Version of Solidity compiler this program was written for
-pragma solidity ^0.4.22;
+pragma solidity ^0.8.20;
 
 contract owned {
 	address owner;
@@ -17,7 +17,7 @@ contract owned {
 contract mortal is owned {
 	// Contract destructor
 	function destroy() public onlyOwner {
-		selfdestruct(owner);
+		selfdestruct(payable(owner));
 	}
 }
 
@@ -27,8 +27,8 @@ contract Faucet is mortal {
         // Limit withdrawal amount
 		require(withdraw_amount <= 0.1 ether);
         // Send the amount to the address that requested it
-        msg.sender.transfer(withdraw_amount);
+        payable(msg.sender).transfer(withdraw_amount);
     }
     // Accept any incoming amount
-    function () public payable {}
+    receive() external payable {}
 }

code/Solidity/Faucet6.sol

@@ -1,5 +1,5 @@
 // Version of Solidity compiler this program was written for
-pragma solidity ^0.4.22;
+pragma solidity ^0.8.20;
 
 contract owned {
 	address owner;
@@ -17,7 +17,7 @@ contract owned {
 contract mortal is owned {
 	// Contract destructor
 	function destroy() public onlyOwner {
-		selfdestruct(owner);
+		selfdestruct(payable(owner));
 	}
 }
 
@@ -27,8 +27,8 @@ contract Faucet is mortal {
         // Limit withdrawal amount
 		require(withdraw_amount <= 0.1 ether);
         // Send the amount to the address that requested it
-        msg.sender.transfer(withdraw_amount);
+        payable(msg.sender).transfer(withdraw_amount);
     }
     // Accept any incoming amount
-    function () public payable {}
+    receive() external payable {}
 }

code/Solidity/Faucet7.sol

@@ -1,5 +1,5 @@
 // Version of Solidity compiler this program was written for
-pragma solidity ^0.4.22;
+pragma solidity ^0.8.20;
 
 contract owned {
 	address owner;
@@ -17,7 +17,7 @@ contract owned {
 contract mortal is owned {
 	// Contract destructor
 	function destroy() public onlyOwner {
-		selfdestruct(owner);
+		selfdestruct(payable(owner));
 	}
 }
 
@@ -26,11 +26,11 @@ contract Faucet is mortal {
     function withdraw(uint withdraw_amount) public {
         // Limit withdrawal amount
 		require(withdraw_amount <= 0.1 ether);
-		require(this.balance >= withdraw_amount,
-			"Insufficient balance in faucet for withdrawal request")
+		require(address(this).balance >= withdraw_amount,
+			"Insufficient balance in faucet for withdrawal request");
         // Send the amount to the address that requested it
-        msg.sender.transfer(withdraw_amount);
+        payable(msg.sender).transfer(withdraw_amount);
     }
     // Accept any incoming amount
-    function () public payable {}
+    receive() external payable {}
 }

code/Solidity/Faucet8.sol

@@ -1,5 +1,5 @@
 // Version of Solidity compiler this program was written for
-pragma solidity ^0.4.22;
+pragma solidity ^0.8.20;
 
 contract owned {
 	address owner;
@@ -17,7 +17,7 @@ contract owned {
 contract mortal is owned {
 	// Contract destructor
 	function destroy() public onlyOwner {
-		selfdestruct(owner);
+		selfdestruct(payable(owner));
 	}
 }
 
@@ -29,14 +29,14 @@ contract Faucet is mortal {
 	function withdraw(uint withdraw_amount) public {
 		// Limit withdrawal amount
 		require(withdraw_amount <= 0.1 ether);
-		require(this.balance >= withdraw_amount,
+		require(address(this).balance >= withdraw_amount,
 			"Insufficient balance in faucet for withdrawal request");
 		// Send the amount to the address that requested it
-		msg.sender.transfer(withdraw_amount);
+		payable(msg.sender).transfer(withdraw_amount);
 		emit Withdrawal(msg.sender, withdraw_amount);
 	}
 	// Accept any incoming amount
-	function () public payable {
+	receive() external payable {
 		emit Deposit(msg.sender, msg.value);
 	}
 }

code/Solidity/Token.sol

@@ -1,11 +1,11 @@
-import "Faucet.sol"
+import "./Faucet8.sol";
 
 contract Token is mortal {
 
 	Faucet _faucet;
 
 	constructor(address _f) {
 		_faucet = Faucet(_f);
-		_faucet.withdraw(0.1 ether)
+		_faucet.withdraw(0.1 ether);
 	}
 }