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|
use actix_web::{
dev, http::header, multipart, FromRequest, FutureResponse, HttpMessage, HttpRequest,
HttpResponse, Query,
};
use futures::{future, future::FutureResult, Future, Stream};
use serde::Deserialize;
use std::{
fs,
io::Write,
path::{Component, PathBuf},
};
use crate::errors::{self, ContextualErrorKind};
use crate::renderer;
/// Query parameters
#[derive(Debug, Deserialize)]
struct QueryParameters {
path: PathBuf,
}
/// Create future to save file.
fn save_file(
field: multipart::Field<dev::Payload>,
file_path: PathBuf,
overwrite_files: bool,
) -> Box<Future<Item = i64, Error = ContextualErrorKind>> {
if !overwrite_files && file_path.exists() {
return Box::new(future::err(ContextualErrorKind::CustomError(
"File already exists, and the overwrite_files option has not been set".to_string(),
)));
}
let mut file = match std::fs::File::create(&file_path) {
Ok(file) => file,
Err(e) => {
return Box::new(future::err(ContextualErrorKind::IOError(
format!("Failed to create file in {}", file_path.display()),
e,
)));
}
};
Box::new(
field
.map_err(ContextualErrorKind::MultipartError)
.fold(0i64, move |acc, bytes| {
let rt = file
.write_all(bytes.as_ref())
.map(|_| acc + bytes.len() as i64)
.map_err(|e| {
ContextualErrorKind::IOError("Failed to write to file".to_string(), e)
});
future::result(rt)
}),
)
}
/// Create new future to handle file as multipart data.
fn handle_multipart(
item: multipart::MultipartItem<dev::Payload>,
mut file_path: PathBuf,
overwrite_files: bool,
) -> Box<Stream<Item = i64, Error = ContextualErrorKind>> {
match item {
multipart::MultipartItem::Field(field) => {
let filename = field
.headers()
.get(header::CONTENT_DISPOSITION)
.ok_or(ContextualErrorKind::ParseError)
.and_then(|cd| {
header::ContentDisposition::from_raw(cd)
.map_err(|_| ContextualErrorKind::ParseError)
})
.and_then(|content_disposition| {
content_disposition
.get_filename()
.ok_or(ContextualErrorKind::ParseError)
.map(String::from)
});
let err = |e: ContextualErrorKind| Box::new(future::err(e).into_stream());
match filename {
Ok(f) => {
match fs::metadata(&file_path) {
Ok(metadata) => {
if !metadata.is_dir() {
return err(ContextualErrorKind::InvalidPathError(format!(
"cannot upload file to {}, since it's not a directory",
&file_path.display()
)));
} else if metadata.permissions().readonly() {
return err(ContextualErrorKind::InsufficientPermissionsError(
file_path.display().to_string(),
));
}
}
Err(_) => {
return err(ContextualErrorKind::InsufficientPermissionsError(
file_path.display().to_string(),
));
}
}
file_path = file_path.join(f);
Box::new(save_file(field, file_path, overwrite_files).into_stream())
}
Err(e) => err(e(
"HTTP header".to_string(),
"Failed to retrieve the name of the file to upload".to_string(),
)),
}
}
multipart::MultipartItem::Nested(mp) => Box::new(
mp.map_err(ContextualErrorKind::MultipartError)
.map(move |item| handle_multipart(item, file_path.clone(), overwrite_files))
.flatten(),
),
}
}
/// Handle incoming request to upload file.
/// Target file path is expected as path parameter in URI and is interpreted as relative from
/// server root directory. Any path which will go outside of this directory is considered
/// invalid.
/// This method returns future.
pub fn upload_file(req: &HttpRequest<crate::MiniserveConfig>) -> FutureResponse<HttpResponse> {
let return_path = if let Some(header) = req.headers().get(header::REFERER) {
header.to_str().unwrap_or("/").to_owned()
} else {
"/".to_string()
};
let app_root_dir = if let Ok(dir) = req.state().path.canonicalize() {
dir
} else {
return Box::new(create_error_response("Internal server error", &return_path));
};
let path = match Query::<QueryParameters>::extract(req) {
Ok(query) => {
if let Ok(stripped_path) = query.path.strip_prefix(Component::RootDir) {
stripped_path.to_owned()
} else {
query.path.clone()
}
}
Err(_) => {
return Box::new(create_error_response(
"Unspecified parameter path",
&return_path,
))
}
};
// If the target path is under the app root directory, save the file.
let target_dir = match &app_root_dir.clone().join(path).canonicalize() {
Ok(path) if path.starts_with(&app_root_dir) => path.clone(),
_ => return Box::new(create_error_response("Invalid path", &return_path)),
};
let overwrite_files = req.state().overwrite_files;
Box::new(
req.multipart()
.map_err(ContextualErrorKind::MultipartError)
.map(move |item| handle_multipart(item, target_dir.clone(), overwrite_files))
.flatten()
.collect()
.then(move |e| match e {
Ok(_) => future::ok(
HttpResponse::SeeOther()
.header(header::LOCATION, return_path.to_string())
.finish(),
),
Err(e) => create_error_response(&e.to_string(), &return_path),
}),
)
}
/// Convenience method for creating response errors, if file upload fails.
fn create_error_response(
description: &str,
return_path: &str,
) -> FutureResult<HttpResponse, actix_web::error::Error> {
errors::log_error_chain(description.to_string());
future::ok(
HttpResponse::BadRequest()
.content_type("text/html; charset=utf-8")
.body(renderer::render_error(description, return_path).into_string()),
)
}
|
