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#[macro_use]
extern crate lazy_static;
mod http;
mod peekable_bufreader;
mod response;
mod chunked_bufreader;
use std::env;
use std::path::PathBuf;
use std::path::Path;
use futures::stream;
use futures::stream::StreamExt;
use async_std::prelude::*;
use async_std::task;
use async_std::net::{TcpStream, TcpListener};
use async_std::io::{BufReader, BufWriter};
use async_std::fs::File;
use async_std::fs;
use chrono::offset::Local;
use chrono::DateTime;
use http::{Parser, Method};
use peekable_bufreader::PeekableBufReader;
use chunked_bufreader::ChunkedBufReader;
use response::{Response, BadRequest, NotFound, NotImplemented, InternalServerError};
#[async_std::main]
async fn main() {
let port = env::args().skip(1).next().unwrap_or("8000".to_owned()).parse::<u16>().unwrap_or(8000);
let listener = TcpListener::bind(format!("0.0.0.0:{}", port)).await;
match listener {
Err(e) => {
eprintln!("Failed to bind TCP Listener: {}", e);
return;
},
_ => {},
}
let listener = listener.unwrap();
listener
.incoming()
.for_each_concurrent(None, |stream| async move {
if let Ok(valid) = stream {
task::spawn(handle_connection(valid));
}
})
.await;
}
async fn handle_connection(mut stream: TcpStream) {
let response = generate_response(&stream).await.response_bytes();
let writer = BufWriter::new(&mut stream);
let mut writer = response.fold(writer, |mut writer, bytes| async move {
writer.write(&bytes).await.unwrap();
writer
}).await;
writer.flush().await.unwrap();
stream.flush().await.unwrap();
}
async fn generate_response(stream: &TcpStream) -> Box<dyn Response> {
let reader = PeekableBufReader::new(BufReader::new(stream));
let request = match Parser::new(reader).parse().await {
Some(success) => success,
None => return Box::new(BadRequest{}),
};
match request.method {
Method::GET => {
if request.requested_path.iter().filter(|segment| segment.contains("/")).count() != 0 {
return Box::new(BadRequest{});
} else {
let path = match PathBuf::from("./".to_owned() + &request.requested_path.join("/")).canonicalize() {
Ok(canonical_path) => canonical_path,
Err(_) => return Box::new(NotFound{}),
};
let current_dir = match env::current_dir() {
Ok(dir) => match dir.canonicalize() {
Ok(canonical_path) => canonical_path,
Err(_) => return Box::new(InternalServerError{}),
},
Err(_) => return Box::new(InternalServerError{}),
};
if !is_path_ancestor_of(¤t_dir, &path) {
return Box::new(NotFound{});
}
let metadata = match fs::metadata(&path).await {
Ok(data) => data,
Err(_) => return Box::new(NotFound{}),
};
if metadata.is_dir() {
let friendly_name = match path.strip_prefix(¤t_dir) {
Ok(result) => {
match result.to_str() {
Some(result) => result,
None => return Box::new(InternalServerError{}),
}
},
Err(_) => return Box::new(InternalServerError{}),
};
let mut listings = Vec::new();
if path != current_dir {
listings.push(format!(include_str!("../res/listing_entry.html"), path.parent().unwrap().strip_prefix(¤t_dir).unwrap().to_str().unwrap(), "..", "-", "-"));
}
for file in path.read_dir().unwrap() {
let file_path = file.unwrap().path();
let file_metadata = fs::metadata(&file_path).await.unwrap();
let created_time = match file_metadata.created() {
Ok(birth_time) => {
let formatted_time: DateTime<Local> = birth_time.into();
formatted_time.format("%d-%b-%Y %H:%M").to_string()
},
Err(_) => "-".to_owned(),
};
let file_size = if file_metadata.is_dir() {
"-".to_owned()
} else {
file_metadata.len().to_string()
};
listings.push(format!(include_str!("../res/listing_entry.html"),
file_path.strip_prefix(¤t_dir).unwrap().to_str().unwrap(),
file_path.file_name().unwrap().to_str().unwrap(),
created_time,
file_size,
))
}
return Box::new(response::Ok {
file_stream: Box::new(stream::iter(vec![Vec::from(
format!(
include_str!("../res/listing.html"),
friendly_name,
friendly_name,
listings.join("\n"),
).as_bytes()
)].into_iter().map(|entry| entry.to_owned())))
});
} else {
return Box::new(response::Ok{ file_stream: Box::new(ChunkedBufReader::new(BufReader::new(File::open(&path).await.unwrap()))) })
}
}
},
_ => return Box::new(NotImplemented{}),
}
}
fn is_path_ancestor_of(ancestor: &Path, child: &Path) -> bool {
let mut ancestors = child.ancestors();
loop {
if let Some(parent) = ancestors.next() {
if parent == ancestor {
return true;
}
} else {
return false;
}
}
}
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