datatrash/src/multipart.rs

151 lines
5.2 KiB
Rust

use crate::file_kind::FileKind;
use actix_multipart::{Field, Multipart};
use actix_web::{error, http::header::DispositionParam};
use async_std::{fs, fs::File, path::Path, prelude::*};
use chrono::{prelude::*, Duration};
use futures::{StreamExt, TryStreamExt};
pub(crate) struct UploadConfig {
pub original_name: String,
pub valid_till: DateTime<Local>,
pub kind: FileKind,
pub delete_on_download: bool,
}
pub(crate) async fn parse_multipart(
mut payload: Multipart,
file_id: &str,
filename: &Path,
max_size: Option<u64>,
) -> Result<UploadConfig, error::Error> {
let mut original_name: Option<String> = None;
let mut keep_for: Option<String> = None;
let mut kind: Option<FileKind> = None;
let mut delete_on_download = false;
while let Ok(Some(field)) = payload.try_next().await {
let name = get_field_name(&field)?;
let name = name.as_str();
match name {
"keep_for" => {
keep_for = Some(parse_string(name, field).await?);
}
"file" => {
let file_original_name = get_original_filename(&field);
if file_original_name == None || file_original_name.as_deref() == Some("") {
continue;
}
original_name = file_original_name;
kind = Some(FileKind::BINARY);
let mut file = fs::File::create(&filename)
.await
.map_err(|_| error::ErrorInternalServerError("could not create file"))?;
write_to_file(&mut file, field, max_size).await?;
}
"text" => {
if original_name.is_some() {
continue;
}
original_name = Some(format!("{}.txt", file_id));
kind = Some(FileKind::TEXT);
let mut file = fs::File::create(&filename)
.await
.map_err(|_| error::ErrorInternalServerError("could not create file"))?;
write_to_file(&mut file, field, max_size).await?;
}
"delete_on_download" => {
delete_on_download = dbg!(parse_string(name, field).await?) != "false";
}
_ => {}
};
}
let original_name = original_name.ok_or_else(|| error::ErrorBadRequest("no content found"))?;
let kind = kind.ok_or_else(|| error::ErrorBadRequest("no content found"))?;
if original_name.len() > 255 {
return Err(error::ErrorBadRequest("filename is too long"));
}
let valid_till = if let Some(keep_for) = keep_for {
let keep_for = keep_for.parse().map_err(|e| {
error::ErrorBadRequest(format!("field keep_for is not a number: {}", e))
})?;
let max_keep_for = Duration::days(31).num_seconds();
if keep_for > max_keep_for {
return Err(error::ErrorBadRequest(format!(
"maximum allowed validity is {} seconds, but you specified {} seconds",
max_keep_for, keep_for
)));
}
Local::now() + Duration::seconds(keep_for)
} else {
Local::now() + Duration::seconds(1800)
};
Ok(UploadConfig {
original_name,
valid_till,
kind,
delete_on_download,
})
}
fn get_field_name(field: &Field) -> Result<String, error::Error> {
Ok(field
.content_disposition()
.ok_or(error::ParseError::Incomplete)?
.get_name()
.map(|s| s.to_owned())
.ok_or(error::ParseError::Incomplete)?)
}
async fn parse_string(name: &str, field: actix_multipart::Field) -> Result<String, error::Error> {
let data = read_content(field).await?;
String::from_utf8(data)
.map_err(|_| error::ErrorBadRequest(format!("could not parse field {} as utf-8", name)))
}
async fn read_content(mut field: actix_multipart::Field) -> Result<Vec<u8>, error::Error> {
let mut data = Vec::new();
while let Some(chunk) = field.next().await {
data.extend(chunk.map_err(error::ErrorBadRequest)?);
}
Ok(data)
}
async fn write_to_file(
file: &mut File,
mut field: actix_multipart::Field,
max_size: Option<u64>,
) -> Result<(), error::Error> {
let mut written_bytes: u64 = 0;
while let Some(chunk) = field.next().await {
let chunk = chunk.map_err(error::ErrorBadRequest)?;
if let Some(max_size) = max_size {
written_bytes += chunk.len() as u64;
if written_bytes > max_size {
return Err(error::ErrorBadRequest(format!(
"exceeded maximum file size of {} bytes",
max_size
)));
}
}
file.write_all(chunk.as_ref())
.await
.map_err(|_| error::ErrorInternalServerError("could not write file"))?;
}
Ok(())
}
fn get_original_filename(field: &actix_multipart::Field) -> Option<String> {
field.content_disposition().and_then(|content_disposition| {
content_disposition
.parameters
.into_iter()
.find_map(|param| match param {
DispositionParam::Filename(filename) => Some(filename),
_ => None,
})
})
}