initial_commit

.gitignore

@@ -33,3 +33,15 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+
+# Hardhat files
+cache
+artifacts
+

README.md

@@ -1,34 +1,13 @@
-This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+# Sample Hardhat Project
 
-## Getting Started
+This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, and a script that deploys that contract.
 
-First, run the development server:
+Try running some of the following tasks:
 
-```bash
-npm run dev
-# or
-yarn dev
-# or
-pnpm dev
+```shell
+npx hardhat help
+npx hardhat test
+REPORT_GAS=true npx hardhat test
+npx hardhat node
+npx hardhat run scripts/deploy.js
 ```
-
-Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
-
-You can start editing the page by modifying `app/page.js`. The page auto-updates as you edit the file.
-
-This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
-
-## Learn More
-
-To learn more about Next.js, take a look at the following resources:
-
-- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
-- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
-
-You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
-
-## Deploy on Vercel
-
-The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
-
-Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

contracts/chatApp.sol

@@ -0,0 +1,67 @@
+// SPDX_License-Identifier: MIT
+
+pragma solidity >=0.7.0 <0.9.0;
+
+contract ChatApp{
+
+    //USER STRUCT
+    struct user {
+        string name;
+        friend[] friendList;
+
+    }
+    struct friend{
+        address pubkey;
+        string name;
+
+    }
+    struct message{
+        address sender;
+        uint256 timestamp;
+        string msg;
+    }
+
+    mapping(address => user) userList;
+    mapping(bytes32 => message[]) allMessages;
+
+    function checkUserExists(address pubkey ) public view returns(bool)
+    {  
+        return bytes(userList[pubkey].name).length>0;
+    }
+
+    function createAccount(string calldata name) external {
+        require(checkUserExists(msg.sender) == false, "User already exists");
+        require(bytes(name).length>0, "Username cannot be empty");
+        userList[msg.sender].name =name;
+    }
+    function getUsername(address pubkey) external view returns(string memory)
+    {
+        require(checkUserExists(pubkey), "User is not registered"); 
+        return userList[pubkey].name;
+    }
+    function addFriend(address friend_key, string calldata name) external {
+        require(checkUserExists(msg.sender), "Create an account first");
+        require(checkUserExists(friend_key), "User is not registered");
+        require(msg.sender !=friend_key, "User cannot add themselves");
+        require(checkAlreadyFriends(msg.sender, friend_key)==false, "These users are already friend");
+        _addFriend(msg.sender, friend_key, name);
+        _addFriend(friend_key, msg.sender, userList[msg.sender]. name);
+    }
+
+    function checkAlreadyFriends(address pubkey1, address pubkey2) internal view returns(bool)
+    {
+        if(userList[pubkey1].friendList.length > userList[pubkey2].friendList.length)
+        {
+            address tmp=pubkey1;
+            pubkey1=pubkey2;
+            pubkey2=tmp;
+        }
+
+        for(uint256 i=0; i<userList[pubkey1].friendList.length;i++)
+        {
+            if(userList[pubkey1].friendList[i].pubkey = pubkey2)
+            return true;
+        }
+        return false;
+    }
+}

hardhat.config.js

@@ -0,0 +1,6 @@
+require("@nomicfoundation/hardhat-toolbox");
+
+/** @type import('hardhat/config').HardhatUserConfig */
+module.exports = {
+  solidity: "0.8.18",
+};