P2P File Sharing Application

Peer-to-Peer file sharing application built with JavaFX that enables secure file transfers, real-time chat, and network monitoring across a distributed network.

Features

Core Functionality

• Real P2P Network: Socket-based peer-to-peer communication with automatic node discovery
• File Encryption: AES encryption for secure file transfers using secret key authentication
• Multi-threaded Downloads: Concurrent file transfers with progress tracking
• Upload Progress Tracking: Real-time upload progress monitoring
• Network Statistics: Comprehensive monitoring of upload/download speeds, data transferred, and connected nodes
• File Search: Search for files across all connected nodes in the network
• Chat/Messaging: Real-time messaging between connected nodes
• Modern UI: Clean and intuitive JavaFX interface with split-pane layout

Requirements

• Java 17 or higher
• Maven 3.6 or higher
• JavaFX 21 (included via Maven dependencies)

Installation

1. Clone or download this repository:

   git clone https://github.com/ErselSeyit/P2PFileSharing.git
   cd P2PFileSharing

2. Build the project using Maven:

   mvn clean compile

Running the Application

Using Maven (Recommended)

mvn javafx:run

Using Java directly

# Compile first
mvn clean compile

# Run (adjust JavaFX module path if needed)
java --module-path <path-to-javafx-sdk>/lib --add-modules javafx.controls,javafx.fxml -cp target/classes com.p2pfilesharing.Main

Usage

Setup Phase

1. Select Shared Folder: Click "Browse" to select a folder containing files you want to share
2. Enter Secret Key: Provide a secret key for network authentication (all nodes must use the same key)
3. Set Port: Specify the port number to listen on (default: 8888)
4. Connect to Nodes (Optional): Enter IP address and port of another node to connect
5. Start Network: Click "Start Network" to initialize the P2P network

Main Interface

Left Panel - Files and Nodes

• Search Bar: Search for files across all connected nodes
• Available Files: Lists files from selected node (double-click to download)
• Connected Nodes: Shows all connected nodes (double-click to refresh file list)

Center Panel - Transfers

• Downloads: Active download progress with real-time updates
• Uploads: Active upload progress tracking

Right Panel - Chat and Statistics

• Chat: Real-time messaging with connected nodes
  • Select a node and type a message to send
• Network Statistics:
  • Total bytes uploaded/downloaded
  • Number of files transferred
  • Current upload/download speeds
  • Number of connected nodes

Key Operations

1. Downloading Files:

   • Select a node from "Connected Nodes"
   • Double-click the node to refresh its file list
   • Double-click a file to start download
   • Progress is shown in real-time

2. Searching Files:

   • Enter search query in the search bar
   • Results from all connected nodes are displayed
   • Files show which node they're from

3. Chatting:

   • Select a node from "Connected Nodes"
   • Type message in chat input field
   • Press "Send" or Enter to send message

4. Connecting to Nodes:

   • Enter IP address and port in setup screen
   • Click "Connect" to establish connection
   • Node will appear in "Connected Nodes" list

Project Structure

P2PFileSharing/
├── src/
│   └── main/
│       ├── java/
│       │   └── com/
│       │       └── p2pfilesharing/
│       │           ├── Main.java                    # Application entry point
│       │           ├── P2PFileSharingApp.java       # Main JavaFX application
│       │           ├── Download.java                # Download model
│       │           ├── model/
│       │           │   ├── NetworkStatistics.java  # Network statistics tracking
│       │           │   └── Upload.java              # Upload model
│       │           ├── network/
│       │           │   ├── NetworkNode.java        # P2P network node implementation
│       │           │   ├── Message.java            # Network message protocol
│       │           │   ├── MessageType.java        # Message types enum
│       │           │   ├── NodeInfo.java           # Node information
│       │           │   └── *Callback.java          # Callback interfaces
│       │           └── security/
│       │               └── FileEncryption.java     # File encryption utilities
│       └── resources/                               # Application resources
├── pom.xml                                          # Maven configuration
├── .gitignore                                       # Git ignore file
└── README.md                                        # This file

Technologies Used

• Java 17: Core programming language
• JavaFX 21: GUI framework
• Maven: Build and dependency management
• BouncyCastle: Cryptographic library for encryption
• Gson: JSON processing (for future enhancements)

Network Protocol

The application uses a custom P2P protocol with the following message types:

• HANDSHAKE: Initial connection establishment
• FILE_REQUEST: Request a file from a node
• FILE_START/END: File transfer markers
• FILE_LIST_REQUEST/RESPONSE: File listing
• CHAT_MESSAGE: Chat messages
• SEARCH_REQUEST/RESPONSE: File search

Security

• Files are encrypted using AES encryption
• Secret key authentication required for network access
• All file transfers are encrypted
• Key derivation from user-provided secret key

Performance Features

• Multi-threaded file transfers
• Concurrent downloads/uploads
• Efficient socket-based communication
• Progress tracking with minimal overhead
• Real-time statistics updates

License

This project is open source and available for educational purposes.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Notes

• Ensure firewall allows connections on the specified port
• All nodes must use the same secret key to communicate
• Files are downloaded to a downloads subfolder in the shared folder
• Network statistics update in real-time during transfers