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a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..a685d40 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,36 @@ +use std::sync::{Arc, Mutex}; + +use axum::{ + routing::{get, post}, + Router, +}; +use bytes::Bytes; +use memory_cache::MemoryCache; + +mod state; +mod new; +mod view; + +#[tokio::main] +async fn main() { + let mut cache: MemoryCache = MemoryCache::new(); + + let state = state::AppState { + cache: Mutex::new(cache) + }; + + let app = Router::new() + .route("/new", post(new::new)) + .route("/p/:name", get(view::view)) + .route("/", get(index)) + .with_state(Arc::new(state)); + + axum::Server::bind(&"127.0.0.1:8000".parse().unwrap()) // don't forget to change this! it's local for now + .serve(app.into_make_service()) + .await + .unwrap(); +} + +async fn index() -> &'static str { + "hi world!" +} diff --git a/src/new.rs b/src/new.rs new file mode 100644 index 0000000..4ae8caa --- /dev/null +++ b/src/new.rs @@ -0,0 +1,144 @@ +use std::{collections::HashMap, ffi::OsStr, io::Read, path::PathBuf, sync::Arc, time::Duration}; + +use axum::{ + extract::{BodyStream, Query, State}, + http::HeaderValue, +}; +use bytes::{BufMut, Bytes, BytesMut}; +use hyper::{header, HeaderMap, StatusCode}; +use rand::Rng; +use tokio::{ + fs::File, + io::AsyncWriteExt, + sync::mpsc::{self, Receiver, Sender}, +}; +use tokio_stream::StreamExt; + +// create an upload name from an original file name +fn gen_path(original_name: &String) -> PathBuf { + // extract extension from original name + let extension = PathBuf::from(original_name) + .extension() + .and_then(OsStr::to_str) + .unwrap_or_default() + .to_string(); + + // generate a 6-character alphanumeric string + let id: String = rand::thread_rng() + .sample_iter(&rand::distributions::Alphanumeric) + .take(6) + .map(char::from) + .collect(); + + // create the path + let mut path = PathBuf::new(); + path.push("uploads/"); + path.push(id); + path.set_extension(extension); + + // if we're already using it, try again + if path.exists() { + gen_path(original_name) + } else { + path + } +} + +pub async fn new( + State(state): State>, + headers: HeaderMap, + Query(params): Query>, + mut stream: BodyStream, +) -> Result { + // require name parameter, it's used for determining the file extension + if !params.contains_key("name") { + return Err(StatusCode::BAD_REQUEST); + } + + // generate a path, take the name, format a url + let path = gen_path(params.get("name").unwrap()); + + let name = path + .file_name() + .and_then(OsStr::to_str) + .unwrap_or_default() + .to_string(); // i hope this never happens. that would suck + + let url = format!("http://127.0.0.1:8000/p/{}", name); + + // process the upload in the background so i can send the URL back immediately! + // this isn't supported by ShareX (it waits for the request to complete before handling the response) + tokio::spawn(async move { + // get the content length, and if parsing it fails, assume it's really big + // it may be better to make it fully content-length not required because this feels kind of redundant + let content_length = headers + .get(header::CONTENT_LENGTH) + .unwrap_or(&HeaderValue::from_static("")) + .to_str() + .and_then(|s| Ok(usize::from_str_radix(s, 10))) + .unwrap() + .unwrap_or(usize::MAX); + + // if the upload size exceeds 80 MB, we skip caching! + // previously, i was going to use redis with a 500 MB max (redis's is 512MiB) + // with or without redis, 500 MB is still a bit much.. + // it could probably be read from disk before anyone could fully download it + let mut use_cache = content_length < 80_000_000; + + println!( + "[upl] content length: {} using cache: {}", + content_length, use_cache + ); + + // create file to save upload to + let mut file = File::create(path) + .await + .expect("could not open file! make sure your upload path exists"); + + let mut data: BytesMut = if use_cache { + BytesMut::with_capacity(content_length) + } else { + BytesMut::new() + }; + + let (tx, mut rx): (Sender, Receiver) = mpsc::channel(1); + + tokio::spawn(async move { + while let Some(chunk) = rx.recv().await { + println!("[io] received new chunk"); + file.write_all(&chunk) + .await + .expect("error while writing file to disk"); + } + }); + + while let Some(chunk) = stream.next().await { + let chunk = chunk.unwrap(); + + println!("[upl] sending data to io task"); + tx.send(chunk.clone()).await.unwrap(); + + if use_cache { + println!("[upl] receiving data into cache"); + if data.len() + chunk.len() > data.capacity() { + println!("[upl] too much data! the client had an invalid content-length!"); + + // if we receive too much data, drop the buffer and stop using cache (it is still okay to use disk, probably) + data = BytesMut::new(); + use_cache = false; + } else { + data.put(chunk); + } + } + } + + let mut cache = state.cache.lock().unwrap(); + + if use_cache { + println!("[upl] caching upload!!"); + cache.insert(name, data.freeze(), Some(Duration::from_secs(30))); + } + }); + + Ok(url) +} diff --git a/src/state.rs b/src/state.rs new file mode 100644 index 0000000..3cbce6b --- /dev/null +++ b/src/state.rs @@ -0,0 +1,8 @@ +use std::sync::{Mutex, Arc}; + +use bytes::Bytes; +use memory_cache::MemoryCache; + +pub struct AppState { + pub cache: Mutex> +} \ No newline at end of file diff --git a/src/view.rs b/src/view.rs new file mode 100644 index 0000000..ab7e628 --- /dev/null +++ b/src/view.rs @@ -0,0 +1,133 @@ +use std::{ + ffi::OsStr, + path::{Component, PathBuf}, + sync::Arc, +}; + +use axum::{ + body::StreamBody, + extract::{Path, State}, + response::{IntoResponse, Response}, +}; +use bytes::{buf::Reader, Bytes}; +use hyper::StatusCode; +use tokio::fs::File; +use tokio_util::io::ReaderStream; + +/* pub enum ViewResponse { + FromDisk(StreamBody>), + FromCache(Bytes) +} + +impl IntoResponse for ViewResponse { + fn into_response(self) -> Response { + match self { + ViewResponse::FromDisk(stream) => stream.into_response(), + ViewResponse::FromCache(data) => data.into_response() + } + } +} */ + +pub async fn view( + State(state): State>, + Path(original_path): Path, +) -> Response { + println!("{:?}", original_path); + + // (hopefully) prevent path traversal, just check for any non-file components + if original_path + .components() + .into_iter() + .any(|x| !matches!(x, Component::Normal(_))) + { + println!("lol NOPE"); + return StatusCode::NOT_FOUND.into_response(); + } + + let name = original_path + .file_name() + .and_then(OsStr::to_str) + .unwrap_or_default() + .to_string(); + + let cache = state.cache.lock().unwrap(); + + let cache_item = cache.get(&name); + + if true /* cache_item.is_none() */ { + let mut path = PathBuf::new(); + path.push("uploads/"); + path.push(name); + + if !path.exists() || !path.is_file() { + return StatusCode::NOT_FOUND.into_response(); + } + + let file = File::open(path).await.unwrap(); + + let reader = ReaderStream::new(file); + let stream = StreamBody::new(reader); + + println!("from disk"); + + return stream.into_response(); + } + + println!("from cache! :D"); + + return "asdf".into_response(); +} + +/* pub async fn view( + State(mem_cache): State>, + Path(original_path): Path, +) -> Response { + for component in original_path.components() { + println!("{:?}", component); + } + + // (hopefully) prevent path traversal, just check for any non-file components + if original_path + .components() + .into_iter() + .any(|x| !matches!(x, Component::Normal(_))) + { + return StatusCode::NOT_FOUND.into_response() + } + + // this causes an obscure bug where filenames like hiworld%2fnamehere.png will still load namehere.png + // i could limit the path components to 1 and sort of fix this + let name = original_path + .file_name() + .and_then(OsStr::to_str) + .unwrap_or_default() + .to_string(); + + let cache = mem_cache.cache.lock().unwrap(); + + let cache_item = cache.get(&name); + + if cache_item.is_some() { + println!("they requested something in the cache!"); + + let data = cache_item.unwrap().clone(); + + return data.into_response() + } + + let mut path = PathBuf::new(); + path.push("uploads/"); + path.push(name); + + if !path.exists() || !path.is_file() { + return StatusCode::NOT_FOUND.into_response() + } + + let file = File::open(path).await.unwrap(); + + let reader = ReaderStream::new(file); + let stream = StreamBody::new(reader); + + stream.into_response() +} + */