Create SidraBridge.sol

blockchain_integration/pi_network/pi-network-interoperability/bridge-contracts/sidra-chain/SidraBridge.sol

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+pragma solidity ^0.8.0;
+
+import "./Pausable.sol";
+import "./Owner.sol";
+import "./WalletAccessControl.sol";
+import "./SidraToken.sol";
+
+contract SidraBridge is Pausable, Owner, WalletAccessControl {
+    SidraToken public sidraToken;
+    address public foreignChainAddress;
+    uint256 public bridgeFee;
+
+    event BridgeTransfer(address indexed from, address indexed to, uint256 value);
+    event BridgeReceived(address indexed from, address indexed to, uint256 value);
+
+    constructor() public {
+        sidraToken = SidraToken(address(new SidraToken()));
+        foreignChainAddress = address(0);
+        bridgeFee = 0.1 * (10**18); // 0.1 ST
+    }
+
+    function setForeignChainAddress(address _foreignChainAddress) public onlyOwner {
+        foreignChainAddress = _foreignChainAddress;
+    }
+
+    function setBridgeFee(uint256 _bridgeFee) public onlyOwner {
+        bridgeFee = _bridgeFee;
+    }
+
+    function transferToForeignChain(address _to, uint256 _value) public whenNotPaused {
+        require(isWalletAllowed(msg.sender), "Wallet not allowed");
+        require(_value > 0, "Invalid value");
+        require(sidraToken.balanceOf(msg.sender) >= _value, "Insufficient balance");
+        sidraToken.transferFrom(msg.sender, address(this), _value);
+        emit BridgeTransfer(msg.sender, _to, _value);
+    }
+
+    function receiveFromForeignChain(address _from, address _to, uint256 _value) public whenNotPaused {
+        require(foreignChainAddress == msg.sender, "Invalid foreign chain address");
+        require(_value > 0, "Invalid value");
+        sidraToken.transfer(_to, _value);
+        emit BridgeReceived(_from, _to, _value);
+    }
+}