commit 497025f4631ca57e1af39b982560babeffd231b0
Author: Andrew Dinh <andrewkdinh@protonmail.com>
Date:   Sat Jun 8 21:15:12 2024 +0700

    First commit

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a640e8c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "send-directory"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "^4.5.4", features = ["derive"] }
+futures-util = "^0.3.30"
+tokio = { version = "*", features = ["macros", "rt-multi-thread"] }
+tokio-tungstenite = "*"
+
+futures-channel = "^0.3.28"
+zip = "^0.6"
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..96eeb4c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+# Send Directory
+
+```bash
+# Receiver process
+sync-directory --port 8080 --output-dir ~/Downloads/output_dir
+
+# Sender process
+sync-directory --from ~/Downloads/input_dir --to ws://localhost:8080
+```
+
+Once the sender command is completed, the receiver process should exit automatically, and the contents of `input_dir` will be found under `output_dir`.
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..35ec975
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,215 @@
+// Synchronize directory
+
+use std::str::FromStr;
+use clap::Parser;
+
+use futures_util::{stream, SinkExt, StreamExt};
+
+use tokio_tungstenite::{connect_async, tungstenite::protocol::Message};
+
+use tokio::net::{TcpListener, TcpStream};
+
+use zip::ZipArchive;
+
+use std::collections::VecDeque;
+use std::error::Error;
+use std::fs::{self, File};
+use std::io::{self, BufReader, Read, Write};
+use std::path::Path;
+use std::env;
+use zip::{ZipWriter, CompressionMethod, write::FileOptions};
+
+#[derive(Parser, Debug)]
+#[command(about = "Send a directory using websockets", long_about = None)]
+struct Args {
+    #[arg(long)]
+    port: Option<usize>,
+    #[arg(long = "output-dir")]
+    output_dir: Option<std::path::PathBuf>,
+
+    #[arg(long)]
+    from: Option<std::path::PathBuf>,
+    #[arg(long)]
+    to: Option<String>,
+}
+
+#[tokio::main]
+async fn main() {
+    let args = Args::parse();
+
+    let result = match (args.port, args.output_dir, args.from, args.to) {
+        (Some(port), Some(output_dir), None, None) => sd_receiver_init(port, output_dir).await,
+        (None, None, Some(from), Some(to)) => sd_sender_init(from, to).await,
+        _ => panic!("Invalid arguments"),
+    };
+
+    match result {
+        Ok(()) => {},
+        Err(e) => println!("ERROR: {}", e),
+    }
+}
+
+///////////////////////////////////////////////////////////
+// RECEIVER
+///////////////////////////////////////////////////////////
+
+async fn sd_receiver_init(port: usize, output_dir: std::path::PathBuf) -> Result<(), Box<dyn Error>> {
+    let url = format!("ws://localhost:{}", port);
+    println!("Syncing directory sent from {} to {:?}", url, output_dir);
+
+    // Remove output directory if it exists
+    if output_dir.exists() {
+        println!("Removing existing output directory {:?}", output_dir);
+        fs::remove_dir_all(&output_dir)?;
+    }
+
+    // Create output directory
+    fs::create_dir_all(&output_dir)?;
+    let zip_output = format!("{}/compressed_files.zip", output_dir.as_path().to_str().expect("Invalid output directory"));
+    let zip_file = std::path::PathBuf::from_str(zip_output.as_str())?;
+    std::fs::write(&zip_file, "")?;
+
+    // Create WebSocket connection
+    let (ws_stream, _) = connect_async(&url).await?;
+    println!("Created Websocket connection with {}", url);
+    let (_, read) = ws_stream.split();
+
+    // Read data from WebSocket connection and write to ZIP file
+    println!("Writing data to ZIP file");
+    let ws_to_stdout = {
+        read.for_each(|message| async {
+            let message = message.expect("Invalid message received");
+            if message.is_close() {
+                println!("Close WebSocket message received");
+                return;
+            }
+            let data = message.into_data();
+            let mut file = fs::OpenOptions::new()
+            .append(true)
+            .open(&zip_output).expect("Unable to open ZIP file");
+
+            file.write_all(&data).expect("Error appending to ZIP file");
+        })
+    };
+    ws_to_stdout.await;
+
+    // Extract ZIP file
+    println!("Extracting ZIP file");
+    extract_zip(&zip_file, &output_dir)?;
+    std::fs::remove_file(zip_file)?;
+
+    println!("Successfully synced directory to {:?}", output_dir);
+    Ok(())
+}
+
+fn extract_zip(zip_file_path: &std::path::PathBuf, output_dir: &std::path::PathBuf) -> Result<(), Box<dyn Error>> {
+    let mut archive = ZipArchive::new(File::open(zip_file_path)?)?;
+
+    // Iterate through the files in the ZIP archive.
+    for i in 0..archive.len() {
+        let mut file = archive.by_index(i)?;
+
+        // Create the path to the extracted file in the destination directory.
+        let target_path = output_dir.join(file.name());
+
+        // Create the destination directory if it does not exist.
+        if let Some(parent_dir) = target_path.parent() {
+            std::fs::create_dir_all(parent_dir)?;
+        }
+
+        let mut output_file = File::create(&target_path)?;
+
+        // Read the contents of the file from the ZIP archive and write them to the destination file.
+        io::copy(&mut file, &mut output_file)?;
+    }
+
+    Ok(())
+}
+
+///////////////////////////////////////////////////////////
+// SENDER
+///////////////////////////////////////////////////////////
+
+async fn sd_sender_init(from: std::path::PathBuf, to: String) -> Result<(), Box<dyn Error>> {
+    // Create ZIP file
+    let curr_dir = env::current_dir()?;
+    let dir_path = format!("{}/compressed_files.zip", curr_dir.as_path().to_str().expect("Invalid current directory"));
+    let zip_file_path = Path::new(&dir_path);
+    println!("Creating ZIP file");
+    create_zip(&zip_file_path, &from)?;
+    println!("Finished creating ZIP file");
+
+    let addr = &to[5..];
+    let try_socket = TcpListener::bind(&addr).await;
+    let listener = try_socket.expect("Failed to bind");
+    println!("Ready to sync directory. Listening on: {}", addr);
+    accept_connection(listener.accept().await?.0).await?;
+    std::fs::remove_file(zip_file_path)?;
+    println!("Successfully synced directory {:?}", from);
+    Ok(())
+}
+
+fn create_zip(zip_file_path: &Path, from: &std::path::PathBuf) -> Result<(), Box<dyn Error>> {
+    let zip_file = File::create(&zip_file_path)?;
+
+    let mut zip = ZipWriter::new(zip_file);
+    let mut dirs = VecDeque::from(vec![from.clone()]);
+
+    // Set file options (e.g., compression method)
+    let options = FileOptions::default()
+        .compression_method(CompressionMethod::DEFLATE);
+
+    // Iterate through the files and add them to the ZIP archive.
+    loop {
+        let dir = match dirs.pop_front() {
+            Some(dir) => dir,
+            None => break,
+        };
+        for file in fs::read_dir(dir)? {
+            let file_path = file?.path();
+
+            if file_path.is_dir() {
+                dirs.push_back(file_path);
+                continue
+            }
+
+            // Adding the file to the ZIP archive.
+            let file_name_temp = file_path.to_str().expect("Invalid ZIP file path").strip_prefix(from.as_path().to_str().expect("Invalid from path")).expect("Unable to strip prefix from absolute file path");
+            let file_name = file_name_temp.strip_prefix("/").unwrap_or(file_name_temp);
+            zip.start_file(file_name, options)?;
+
+            let mut buffer = Vec::new();
+            let file = File::open(file_path)?;
+            io::copy(&mut file.take(u64::MAX), &mut buffer)?;
+
+            zip.write_all(&buffer)?;
+        }
+    }
+
+    zip.finish()?;
+
+    Ok(())
+}
+
+async fn accept_connection(stream: TcpStream) -> Result<(), Box<dyn Error>> {
+    let addr = stream.peer_addr().expect("connected streams should have a peer address");
+    println!("New WebSocket connection: {}", addr);
+
+    let ws_stream = tokio_tungstenite::accept_async(stream)
+        .await
+        .expect("Error during the websocket handshake occurred");
+
+
+    let (mut write, _) = ws_stream.split();
+    let curr_dir = env::current_dir()?;
+    let dir_path = format!("{}/compressed_files.zip", curr_dir.as_path().to_str().expect("Invalid current directory"));
+    let f = File::open(dir_path)?;
+
+    let reader = BufReader::new(f);
+    let mut stream = stream::iter(reader.bytes()).map(|byte| Ok(Message::binary(byte?.to_be_bytes())));
+    write.send_all(&mut stream).await?;
+    println!("Closing WebSocket connection");
+    write.close().await?;
+    
+    Ok(())
+}
\ No newline at end of file