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datatrash/src/multipart.rs

194 lines
6.5 KiB

use crate::{config, file_kind::FileKind};
use actix_multipart::{Field, Multipart};
use actix_web::{error, http::header::DispositionParam, Error};
use futures_util::{StreamExt, TryStreamExt};
use std::path::Path;
use time::OffsetDateTime;
use time::{ext::NumericalDuration, Duration};
use tokio::{fs::File, io::AsyncWriteExt};
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const MAX_UPLOAD_SECONDS: i64 = 31 * 24 * 60 * 60;
const DEFAULT_UPLOAD_SECONDS: u32 = 30 * 60;
pub(crate) struct UploadConfig {
pub original_name: String,
pub valid_till: OffsetDateTime,
pub kind: FileKind,
pub delete_on_download: bool,
}
pub(crate) async fn parse_multipart(
mut payload: Multipart,
file_id: &str,
file_name: &Path,
config: &config::Config,
) -> 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;
let mut password = None;
let mut size = 0;
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.map(|f| f.as_str()) == Some("")
{
continue;
}
original_name = file_original_name.map(|f| f.to_string());
kind = Some(FileKind::Binary);
size = create_file(file_name, field, config.max_file_size).await?;
}
"text" => {
if original_name.is_some() {
continue;
}
original_name = Some(format!("{}.txt", file_id));
kind = Some(FileKind::Text);
size = create_file(file_name, field, config.max_file_size).await?;
}
"delete_on_download" => {
delete_on_download = parse_string(name, field).await? != "false";
}
"password" => {
password = Some(parse_string(name, field).await?);
}
_ => {}
};
}
let original_name = original_name.ok_or_else(|| error::ErrorBadRequest("no content found"))?;
let kind = kind.ok_or_else(|| error::ErrorBadRequest("no content found"))?;
let keep_for: u32 = keep_for
.map(|k| k.parse())
.transpose()
.map_err(|e| error::ErrorBadRequest(format!("field keep_for is not a number: {}", e)))?
.unwrap_or(DEFAULT_UPLOAD_SECONDS);
let valid_duration = keep_for.seconds();
let valid_till = OffsetDateTime::now_utc() + valid_duration;
let upload_config = UploadConfig {
original_name,
valid_till,
kind,
delete_on_download,
};
check_requirements(&upload_config, size, password, &valid_duration, config)?;
Ok(upload_config)
}
fn check_requirements(
upload_config: &UploadConfig,
size: u64,
password: Option<String>,
valid_duration: &Duration,
config: &config::Config,
) -> Result<(), error::Error> {
if upload_config.original_name.len() > 255 {
return Err(error::ErrorBadRequest("filename is too long"));
}
let valid_seconds = valid_duration.whole_seconds();
if valid_seconds > MAX_UPLOAD_SECONDS {
return Err(error::ErrorBadRequest(format!(
"maximum allowed validity is {} seconds, but you specified {} seconds",
MAX_UPLOAD_SECONDS, valid_seconds
)));
}
if let Some(no_auth_limits) = &config.no_auth_limits {
let requires_auth = valid_seconds > no_auth_limits.max_time.whole_seconds()
|| valid_seconds > no_auth_limits.large_file_max_time.whole_seconds()
&& size > no_auth_limits.large_file_size;
// hIGh sECUriTy paSsWoRD CHEck
if requires_auth && password.as_ref() != Some(&no_auth_limits.auth_password) {
return Err(error::ErrorBadRequest(
"upload requires authentication, but authentication was incorrect",
));
}
}
Ok(())
}
fn get_field_name(field: &Field) -> Result<String, error::Error> {
Ok(field
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.content_disposition()
.get_name()
.map(|s| s.to_owned())
.ok_or(error::ParseError::Incomplete)?)
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}
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> {
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let mut data = Vec::new();
while let Some(chunk) = field.try_next().await.map_err(error::ErrorBadRequest)? {
data.extend(chunk);
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}
Ok(data)
}
async fn create_file(
filename: &Path,
field: Field,
max_file_size: Option<u64>,
) -> Result<u64, Error> {
let mut file = File::create(&filename).await.map_err(|file_err| {
log::error!("could not create file {:?}", file_err);
error::ErrorInternalServerError("could not create file")
})?;
let written_bytes = write_to_file(&mut file, field, max_file_size).await?;
Ok(written_bytes)
}
async fn write_to_file(
file: &mut File,
mut field: Field,
max_size: Option<u64>,
) -> Result<u64, error::Error> {
let mut written_bytes: u64 = 0;
while let Some(chunk) = field.next().await {
let chunk = chunk.map_err(error::ErrorBadRequest)?;
written_bytes += chunk.len() as u64;
if let Some(max_size) = max_size {
if written_bytes > max_size {
return Err(error::ErrorBadRequest(format!(
"exceeded maximum file size of {} bytes",
max_size
)));
}
}
file.write_all(&chunk).await.map_err(|write_err| {
log::error!("could not write file {:?}", write_err);
error::ErrorInternalServerError("could not write file")
})?;
}
Ok(written_bytes)
}
fn get_original_filename(field: &actix_multipart::Field) -> Option<&String> {
field
.content_disposition()
.parameters
.iter()
.find_map(|param| match param {
DispositionParam::Filename(filename) => Some(filename),
_ => None,
})
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}