feat: add smart contract for blockchain

asset/MessageStorageABI.json

@@ -0,0 +1,129 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "MessageStorage",
+  "sourceName": "contracts/MessageStorage.sol",
+  "abi": [
+    {
+      "inputs": [],
+      "name": "getAllMessages",
+      "outputs": [
+        {
+          "components": [
+            {
+              "internalType": "uint256",
+              "name": "userId",
+              "type": "uint256"
+            },
+            {
+              "internalType": "string",
+              "name": "message",
+              "type": "string"
+            },
+            {
+              "internalType": "string",
+              "name": "data",
+              "type": "string"
+            }
+          ],
+          "internalType": "struct MessageStorage.Message[]",
+          "name": "",
+          "type": "tuple[]"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "_userId",
+          "type": "uint256"
+        }
+      ],
+      "name": "getMessagesByUserId",
+      "outputs": [
+        {
+          "components": [
+            {
+              "internalType": "uint256",
+              "name": "userId",
+              "type": "uint256"
+            },
+            {
+              "internalType": "string",
+              "name": "message",
+              "type": "string"
+            },
+            {
+              "internalType": "string",
+              "name": "data",
+              "type": "string"
+            }
+          ],
+          "internalType": "struct MessageStorage.Message[]",
+          "name": "",
+          "type": "tuple[]"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "messages",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "userId",
+          "type": "uint256"
+        },
+        {
+          "internalType": "string",
+          "name": "message",
+          "type": "string"
+        },
+        {
+          "internalType": "string",
+          "name": "data",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "_userId",
+          "type": "uint256"
+        },
+        {
+          "internalType": "string",
+          "name": "_message",
+          "type": "string"
+        },
+        {
+          "internalType": "string",
+          "name": "_data",
+          "type": "string"
+        }
+      ],
+      "name": "storeMessage",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
+  "bytecode": 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+  "deployedBytecode": 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+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}

contracts/MessageStorage.sol

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+contract MessageStorage {
+    struct Message {
+        uint userId;
+        string message;
+        string data;
+    }
+
+    Message[] public messages;
+
+    function storeMessage(uint _userId, string memory _message, string memory _data) public {
+        messages.push(Message(_userId, _message, _data));
+    }
+
+    function getAllMessages() public view returns (Message[] memory) {
+        return messages;
+    }
+
+    function getMessagesByUserId(uint _userId) public view returns (Message[] memory) {
+        uint count = 0;
+        for (uint i = 0; i < messages.length; i++) {
+            if (messages[i].userId == _userId) {
+                count++;
+            }
+        }
+
+        Message[] memory result = new Message[](count);
+        uint j = 0;
+        for (uint i = 0; i < messages.length; i++) {
+            if (messages[i].userId == _userId) {
+                result[j] = messages[i];
+                j++;
+            }
+        }
+
+        return result;
+    }
+}

ignition/modules/MessageStorage.js

@@ -0,0 +1,7 @@
+const { buildModule } = require('@nomicfoundation/hardhat-ignition/modules');
+
+module.exports = buildModule('MessageStorageModule', (m) => {
+  const MessageContract = m.contract('MessageStorage');
+
+  return { MessageContract };
+});