🐦 Twitter Smart Contract

A simple, decentralized Twitter-like application built with Solidity. Users can create tweets, like/unlike them, and fetch tweets by user. The contract also includes access control for managing platform-wide tweet constraints.

🚀 Features

• 📝 Post tweets with a configurable character limit (default: 280)
• ❤️ Like and Unlike tweets
• 🔍 View single tweets or all tweets by a user
• 🔐 Only registered users (via profile contract) can interact
• ⚙️ Owner-only access to adjust platform settings

🛠 Tech Stack

• Solidity ^0.8.0
• OpenZeppelin Contracts
• Compatible with Hardhat or Foundry

🧱 Smart Contract Structure

struct Tweet

Defines the structure of a tweet:

• id – Unique tweet ID (per user)
• author – Address of the tweet author
• content – The tweet text
• timestamp – When the tweet was created
• likes – Number of likes

📜 Functions

✅ Tweet Management

Function	Description
createTweet(string _tweet)	Creates a tweet if within character limit and user is registered
getTweet(uint _i)	Fetches the i-th tweet of the sender
getAllTweets(address _owner)	Fetches all tweets by a specific user address

❤️ Likes

Function	Description
likeTweet(address author, uint256 id)	Like a specific tweet from another user
unlikeTweet(address author, uint256 id)	Unlike a tweet (if it has likes)

📊 Analytics

Function	Description
getTotalLikes(address author)	Returns total likes across all tweets by a user

⚙️ Owner-Only Admin

Function	Description
changeTweetLength(uint16 newTweetLength)	Update max allowed tweet length (default: 280)

📣 Events

Event	Description
TweetCreated(uint256 id, address author, string content, uint256 timestamp)	Emitted when a tweet is created
TweetLiked(address liker, address tweetAuthor, uint256 tweetId, uint256 newLikeCount)	Emitted when a tweet is liked
TweetUnliked(address unliker, address tweetAuthor, uint256 tweetId, uint256 newLikeCount)	Emitted when a tweet is unliked

🔐 Access Control

• Inherits from OpenZeppelin's Ownable
• Only the contract owner can modify MAX_TWEET_LENGTH using changeTweetLength
• Only registered users (those with a non-empty displayName in the IProfile contract) can:
  • Create tweets
  • Like tweets
  • Unlike tweets

🧪 Example Usage

// Create a tweet
twitter.createTweet("Hello Web3!");

// Like a tweet
twitter.likeTweet(address_of_author, tweet_id);

// Get all tweets from a user
Tweet[] memory myTweets = twitter.getAllTweets(msg.sender);

📜 License

This project is licensed under the MIT License.

✨ Author

Built with ❤️ using Solidity.
Feel free to contribute or fork the project!

https://www.youtube.com/watch?v=AYpftDFiIgk&t