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asonix 2020-06-06 16:41:17 -05:00
parent 6d7673dfcc
commit 65b83c6a06
3 changed files with 287 additions and 228 deletions
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64
src/error.rs Normal file
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@ -0,0 +1,64 @@
use actix_web::{http::StatusCode, HttpResponse, ResponseError};
#[derive(Debug, thiserror::Error)]
pub enum UploadError {
#[error("Invalid content type provided, {0}")]
ContentType(mime::Mime),
#[error("Couln't upload file, {0}")]
Upload(String),
#[error("Couldn't save file, {0}")]
Save(#[from] actix_fs::Error),
#[error("Error in DB, {0}")]
Db(#[from] sled::Error),
#[error("Error parsing string, {0}")]
ParseString(#[from] std::string::FromUtf8Error),
#[error("Error processing image, {0}")]
Image(#[from] image::error::ImageError),
#[error("Panic in blocking operation")]
Canceled,
#[error("No files present in upload")]
NoFiles,
#[error("Uploaded image could not be served, extension is missing")]
MissingExtension,
}
impl From<actix_form_data::Error> for UploadError {
fn from(e: actix_form_data::Error) -> Self {
UploadError::Upload(e.to_string())
}
}
impl<T> From<actix_web::error::BlockingError<T>> for UploadError
where
T: Into<UploadError> + std::fmt::Debug,
{
fn from(e: actix_web::error::BlockingError<T>) -> Self {
match e {
actix_web::error::BlockingError::Error(e) => e.into(),
_ => UploadError::Canceled,
}
}
}
impl ResponseError for UploadError {
fn status_code(&self) -> StatusCode {
match self {
UploadError::NoFiles | UploadError::ContentType(_) | UploadError::Upload(_) => {
StatusCode::BAD_REQUEST
}
_ => StatusCode::INTERNAL_SERVER_ERROR,
}
}
fn error_response(&self) -> HttpResponse {
HttpResponse::build(self.status_code()).json(serde_json::json!({ "msg": self.to_string() }))
}
}

272
src/main.rs
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@ -1,17 +1,18 @@
use actix_form_data::{Field, Form, Value};
use actix_web::{
guard,
http::{
header::{CacheControl, CacheDirective},
StatusCode,
},
http::header::{CacheControl, CacheDirective},
middleware::Logger,
web, App, HttpResponse, HttpServer, ResponseError,
web, App, HttpResponse, HttpServer,
};
use futures::stream::{Stream, StreamExt, TryStreamExt};
use futures::stream::{Stream, TryStreamExt};
use log::{error, info};
use sha2::Digest;
use std::{path::PathBuf, pin::Pin, sync::Arc};
use std::path::PathBuf;
mod error;
mod upload_manager;
use self::{error::UploadError, upload_manager::UploadManager};
const ACCEPTED_MIMES: &[mime::Mime] = &[
mime::IMAGE_BMP,
@ -23,216 +24,34 @@ const ACCEPTED_MIMES: &[mime::Mime] = &[
const MEGABYTES: usize = 1024 * 1024;
const HOURS: u32 = 60 * 60;
#[derive(Clone)]
struct UploadManager {
inner: Arc<UploadManagerInner>,
}
struct UploadManagerInner {
hasher: sha2::Sha256,
base_dir: PathBuf,
db: sled::Db,
}
#[derive(Debug, thiserror::Error)]
enum UploadError {
#[error("Invalid content type provided, {0}")]
ContentType(mime::Mime),
#[error("Couln't upload file, {0}")]
Upload(String),
#[error("Couldn't save file, {0}")]
Save(#[from] actix_fs::Error),
#[error("Error in DB, {0}")]
Db(#[from] sled::Error),
#[error("Error parsing string, {0}")]
ParseString(#[from] std::string::FromUtf8Error),
#[error("Error processing image, {0}")]
Image(#[from] image::error::ImageError),
#[error("Panic in blocking operation")]
Canceled,
#[error("No files present in upload")]
NoFiles,
#[error("Uploaded image could not be served, extension is missing")]
MissingExtension,
}
impl From<actix_form_data::Error> for UploadError {
fn from(e: actix_form_data::Error) -> Self {
UploadError::Upload(e.to_string())
}
}
impl<T> From<actix_web::error::BlockingError<T>> for UploadError
where
T: Into<UploadError> + std::fmt::Debug,
{
fn from(e: actix_web::error::BlockingError<T>) -> Self {
match e {
actix_web::error::BlockingError::Error(e) => e.into(),
_ => UploadError::Canceled,
}
}
}
impl ResponseError for UploadError {
fn status_code(&self) -> StatusCode {
match self {
UploadError::ContentType(_) | UploadError::Upload(_) => StatusCode::BAD_REQUEST,
_ => StatusCode::INTERNAL_SERVER_ERROR,
}
// Try writing to a file
async fn safe_save_file(path: PathBuf, bytes: bytes::Bytes) -> Result<(), UploadError> {
if let Some(path) = path.parent() {
// create the directory for the file
actix_fs::create_dir_all(path.to_owned()).await?;
}
fn error_response(&self) -> HttpResponse {
HttpResponse::build(self.status_code()).json(serde_json::json!({ "msg": self.to_string() }))
// Only write the file if it doesn't already exist
if let Err(e) = actix_fs::metadata(path.clone()).await {
if e.kind() != Some(std::io::ErrorKind::NotFound) {
return Err(e.into());
}
}
type UploadStream = Pin<Box<dyn Stream<Item = Result<bytes::Bytes, actix_form_data::Error>>>>;
enum Dup {
Exists,
New,
}
impl Dup {
fn exists(&self) -> bool {
match self {
Dup::Exists => true,
_ => false,
}
}
}
impl UploadManager {
async fn new(mut root_dir: PathBuf) -> Result<Self, UploadError> {
let mut sled_dir = root_dir.clone();
sled_dir.push("db");
let db = sled::open(sled_dir)?;
root_dir.push("files");
actix_fs::create_dir_all(root_dir.clone()).await?;
Ok(UploadManager {
inner: Arc::new(UploadManagerInner {
hasher: sha2::Sha256::new(),
base_dir: root_dir,
db,
}),
})
}
async fn upload(
&self,
_filename: String,
content_type: mime::Mime,
mut stream: UploadStream,
) -> Result<Option<PathBuf>, UploadError> {
if ACCEPTED_MIMES.iter().all(|valid| *valid != content_type) {
return Err(UploadError::ContentType(content_type));
}
let mut bytes = bytes::BytesMut::new();
while let Some(res) = stream.next().await {
bytes.extend(res?);
}
let bytes = bytes.freeze();
let hash = self.hash(bytes.clone()).await?;
let (dup, path) = self.check_duplicate(hash, content_type).await?;
if dup.exists() {
return Ok(Some(path));
} else {
return Ok(());
}
// Open the file for writing
let file = actix_fs::file::create(path.clone()).await?;
// try writing
if let Err(e) = actix_fs::file::write(file, bytes).await {
error!("Error saving file, {}", e);
error!("Error writing file, {}", e);
// remove file if writing failed before completion
actix_fs::remove_file(path).await?;
return Err(e.into());
}
Ok(Some(path))
}
async fn hash(&self, bytes: bytes::Bytes) -> Result<Vec<u8>, UploadError> {
let mut hasher = self.inner.hasher.clone();
let hash = web::block(move || {
hasher.input(&bytes);
Ok(hasher.result().to_vec()) as Result<_, UploadError>
})
.await?;
Ok(hash)
}
async fn check_duplicate(
&self,
hash: Vec<u8>,
content_type: mime::Mime,
) -> Result<(Dup, PathBuf), UploadError> {
let mut path = self.inner.base_dir.clone();
let db = self.inner.db.clone();
let filename = self.next_file(content_type).await?;
let filename2 = filename.clone();
let res = web::block(move || {
db.compare_and_swap(hash, None as Option<sled::IVec>, Some(filename2.as_bytes()))
})
.await?;
if let Err(sled::CompareAndSwapError {
current: Some(ivec),
..
}) = res
{
let name = String::from_utf8(ivec.to_vec())?;
path.push(name);
return Ok((Dup::Exists, path));
}
path.push(filename);
Ok((Dup::New, path))
}
async fn next_file(&self, content_type: mime::Mime) -> Result<String, UploadError> {
let base_dir = self.inner.base_dir.clone();
use rand::distributions::{Alphanumeric, Distribution};
let mut limit: usize = 10;
let rng = rand::thread_rng();
loop {
let mut path = base_dir.clone();
let s: String = Alphanumeric.sample_iter(rng).take(limit).collect();
let filename = format!("{}{}", s, to_ext(content_type.clone()));
path.push(filename.clone());
if let Err(e) = actix_fs::metadata(path).await {
if e.kind() == Some(std::io::ErrorKind::NotFound) {
return Ok(filename);
}
return Err(e.into());
}
limit += 1;
}
}
Ok(())
}
fn to_ext(mime: mime::Mime) -> &'static str {
@ -256,6 +75,7 @@ fn from_ext(ext: std::ffi::OsString) -> mime::Mime {
}
}
/// Handle responding to succesful uploads
async fn upload(value: Value) -> Result<HttpResponse, UploadError> {
let images = value
.map()
@ -279,12 +99,14 @@ async fn upload(value: Value) -> Result<HttpResponse, UploadError> {
Ok(HttpResponse::Created().json(serde_json::json!({ "msg": "ok", "files": files })))
}
/// Serve original files
async fn serve(
manager: web::Data<UploadManager>,
filename: web::Path<String>,
) -> Result<HttpResponse, UploadError> {
let mut path = manager.inner.base_dir.clone();
let mut path = manager.image_dir();
path.push(filename.into_inner());
let ext = path
.extension()
.ok_or(UploadError::MissingExtension)?
@ -296,47 +118,54 @@ async fn serve(
Ok(srv_response(stream, ext))
}
/// Serve resized files
async fn serve_resized(
manager: web::Data<UploadManager>,
filename: web::Path<(u32, String)>,
) -> Result<HttpResponse, UploadError> {
use image::GenericImageView;
let mut path = manager.inner.base_dir.clone();
let mut path = manager.image_dir();
let (size, name) = filename.into_inner();
path.push(size.to_string());
path.push(name.clone());
let ext = path
.extension()
.ok_or(UploadError::MissingExtension)?
.to_owned();
let ext = from_ext(ext);
// If the thumbnail doesn't exist, we need to create it
if let Err(e) = actix_fs::metadata(path.clone()).await {
if e.kind() != Some(std::io::ErrorKind::NotFound) {
error!("Error looking up thumbnail, {}", e);
return Err(e.into());
}
let mut original_path = manager.inner.base_dir.clone();
let mut original_path = manager.image_dir();
original_path.push(name.clone());
// Read the image file & produce a DynamicImage
//
// Drop bytes so we don't keep it around in memory longer than we need to
let (img, format) = {
let bytes = actix_fs::read(original_path.clone()).await?;
let format = image::guess_format(&bytes)?;
let img = image::load_from_memory(&bytes)?;
let img = web::block(move || image::load_from_memory(&bytes)).await?;
(img, format)
};
if !img.in_bounds(size, size) {
// return original image if resize target is larger
if !img.in_bounds(size, size) {
drop(img);
let stream = actix_fs::read_to_stream(original_path).await?;
return Ok(srv_response(stream, ext));
}
// perform thumbnail operation in a blocking thread
let img_bytes: bytes::Bytes = web::block(move || {
let mut bytes = std::io::Cursor::new(vec![]);
img.thumbnail(size, size).write_to(&mut bytes, format)?;
@ -347,21 +176,10 @@ async fn serve_resized(
let path2 = path.clone();
let img_bytes2 = img_bytes.clone();
// Save the file in another task, we want to return the thumbnail now
actix_rt::spawn(async move {
if let Some(path) = path2.parent() {
if let Err(e) = actix_fs::create_dir_all(path.to_owned()).await {
error!("Couldn't create directory for thumbnail, {}", e);
}
}
if let Err(e) = actix_fs::metadata(path2.clone()).await {
if e.kind() == Some(std::io::ErrorKind::NotFound) {
if let Err(e) = actix_fs::write(path2, img_bytes2).await {
error!("Error saving image, {}", e);
}
} else {
error!("Error checking image, {}", e);
}
if let Err(e) = safe_save_file(path2, img_bytes2).await {
error!("Error saving file, {}", e);
}
});
@ -378,6 +196,7 @@ async fn serve_resized(
Ok(srv_response(stream, ext))
}
// A helper method to produce responses with proper cache headers
fn srv_response<S, E>(stream: S, ext: mime::Mime) -> HttpResponse
where
S: Stream<Item = Result<bytes::Bytes, E>> + Unpin + 'static,
@ -398,6 +217,9 @@ async fn main() -> Result<(), anyhow::Error> {
env_logger::init();
let manager = UploadManager::new("data/".to_string().into()).await?;
// Create a new Multipart Form validator
//
// This form is expecting a single array field, 'images' with at most 10 files in it
let manager2 = manager.clone();
let form = Form::new()
.max_files(10)

173
src/upload_manager.rs Normal file
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@ -0,0 +1,173 @@
use crate::{error::UploadError, safe_save_file, to_ext, ACCEPTED_MIMES};
use actix_web::web;
use futures::stream::{Stream, StreamExt};
use sha2::Digest;
use std::{path::PathBuf, pin::Pin, sync::Arc};
#[derive(Clone)]
pub struct UploadManager {
inner: Arc<UploadManagerInner>,
}
struct UploadManagerInner {
hasher: sha2::Sha256,
image_dir: PathBuf,
db: sled::Db,
}
type UploadStream = Pin<Box<dyn Stream<Item = Result<bytes::Bytes, actix_form_data::Error>>>>;
enum Dup {
Exists,
New,
}
impl Dup {
fn exists(&self) -> bool {
match self {
Dup::Exists => true,
_ => false,
}
}
}
impl UploadManager {
/// Get the image directory
pub(crate) fn image_dir(&self) -> PathBuf {
self.inner.image_dir.clone()
}
/// Create a new UploadManager
pub(crate) async fn new(mut root_dir: PathBuf) -> Result<Self, UploadError> {
let mut sled_dir = root_dir.clone();
sled_dir.push("db");
// sled automatically creates it's own directories
//
// This is technically a blocking operation but it's fine because it happens before we
// start handling requests
let db = sled::open(sled_dir)?;
root_dir.push("files");
// Ensure file dir exists
actix_fs::create_dir_all(root_dir.clone()).await?;
Ok(UploadManager {
inner: Arc::new(UploadManagerInner {
hasher: sha2::Sha256::new(),
image_dir: root_dir,
db,
}),
})
}
/// Upload the file, discarding bytes if it's already present, or saving if it's new
pub(crate) async fn upload(
&self,
_filename: String,
content_type: mime::Mime,
mut stream: UploadStream,
) -> Result<Option<PathBuf>, UploadError> {
if ACCEPTED_MIMES.iter().all(|valid| *valid != content_type) {
return Err(UploadError::ContentType(content_type));
}
// -- READ IN BYTES FROM CLIENT --
let mut bytes = bytes::BytesMut::new();
while let Some(res) = stream.next().await {
bytes.extend(res?);
}
let bytes = bytes.freeze();
// -- DUPLICATE CHECKS --
// Cloning bytes is fine because it's actually a pointer
let hash = self.hash(bytes.clone()).await?;
let (dup, path) = self.check_duplicate(hash, content_type).await?;
// bail early with path to existing file if this is a duplicate
if dup.exists() {
return Ok(Some(path));
}
// TODO: validate image before saving
// -- WRITE NEW FILE --
safe_save_file(path.clone(), bytes).await?;
Ok(Some(path))
}
// produce a sh256sum of the uploaded file
async fn hash(&self, bytes: bytes::Bytes) -> Result<Vec<u8>, UploadError> {
let mut hasher = self.inner.hasher.clone();
let hash = web::block(move || {
hasher.input(&bytes);
Ok(hasher.result().to_vec()) as Result<_, UploadError>
})
.await?;
Ok(hash)
}
// check for an already-uploaded image with this hash, returning the path to the target file
async fn check_duplicate(
&self,
hash: Vec<u8>,
content_type: mime::Mime,
) -> Result<(Dup, PathBuf), UploadError> {
let mut path = self.inner.image_dir.clone();
let db = self.inner.db.clone();
let filename = self.next_file(content_type).await?;
let filename2 = filename.clone();
let res = web::block(move || {
db.compare_and_swap(hash, None as Option<sled::IVec>, Some(filename2.as_bytes()))
})
.await?;
if let Err(sled::CompareAndSwapError {
current: Some(ivec),
..
}) = res
{
let name = String::from_utf8(ivec.to_vec())?;
path.push(name);
return Ok((Dup::Exists, path));
}
path.push(filename);
Ok((Dup::New, path))
}
// generate a short filename that isn't already in-use
async fn next_file(&self, content_type: mime::Mime) -> Result<String, UploadError> {
let image_dir = self.inner.image_dir.clone();
use rand::distributions::{Alphanumeric, Distribution};
let mut limit: usize = 10;
let rng = rand::thread_rng();
loop {
let mut path = image_dir.clone();
let s: String = Alphanumeric.sample_iter(rng).take(limit).collect();
let filename = format!("{}{}", s, to_ext(content_type.clone()));
path.push(filename.clone());
if let Err(e) = actix_fs::metadata(path).await {
if e.kind() == Some(std::io::ErrorKind::NotFound) {
return Ok(filename);
}
return Err(e.into());
}
limit += 1;
}
}
}