datatrash/src/multipart.rs

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use crate::config;
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use actix_multipart::{Field, Multipart};
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use actix_web::{error, http::header::DispositionParam, Error};
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use futures_util::{StreamExt, TryStreamExt};
use mime::{Mime, APPLICATION_OCTET_STREAM, TEXT_PLAIN};
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use std::path::Path;
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use time::{Duration, OffsetDateTime};
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use tokio::{fs::File, io::AsyncWriteExt};
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const MAX_UPLOAD_DURATION: Duration = Duration::days(31);
const DEFAULT_UPLOAD_DURATION: Duration = Duration::minutes(30);
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pub(crate) struct UploadConfig {
pub original_name: Option<String>,
pub content_type: Mime,
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pub valid_till: OffsetDateTime,
pub delete_on_download: bool,
}
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pub(crate) async fn parse_multipart(
mut payload: Multipart,
file_path: &Path,
config: &config::Config,
) -> Result<UploadConfig, error::Error> {
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let mut original_name: Option<String> = None;
let mut content_type: Option<Mime> = None;
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let mut keep_for_seconds: Option<String> = None;
let mut delete_on_download = false;
let mut password = None;
let mut size = 0;
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while let Ok(Some(field)) = payload.try_next().await {
let name = get_field_name(&field)?;
let name = name.as_str();
match name {
"keep_for" => {
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keep_for_seconds = Some(parse_string(name, field).await?);
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}
"file" => {
let (mime, uploaded_name) = get_file_metadata(&field);
if uploaded_name == None || uploaded_name.as_deref() == Some("") {
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continue;
}
original_name = uploaded_name;
size = create_file(file_path, field, config.max_file_size).await?;
println!("mime: {}", mime);
content_type = Some(if mime == APPLICATION_OCTET_STREAM {
get_content_type(file_path)
} else {
mime.clone()
});
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}
"text" => {
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if original_name.is_some() {
continue;
}
size = create_file(file_path, field, config.max_file_size).await?;
content_type = Some(get_content_type(file_path));
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}
"delete_on_download" => {
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delete_on_download = parse_string(name, field).await? != "false";
}
"password" => {
password = Some(parse_string(name, field).await?);
}
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_ => {}
};
}
let content_type =
content_type.ok_or_else(|| error::ErrorBadRequest("no content type found"))?;
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let keep_for = keep_for_seconds
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.map(|k| k.parse())
.transpose()
.map_err(|e| error::ErrorBadRequest(format!("field keep_for is not a number: {}", e)))?
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.map(Duration::seconds)
.unwrap_or(DEFAULT_UPLOAD_DURATION);
let valid_till = OffsetDateTime::now_utc() + keep_for;
let upload_config = UploadConfig {
original_name,
content_type,
valid_till,
delete_on_download,
};
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check_requirements(&upload_config, size, password, &keep_for, config)?;
Ok(upload_config)
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}
fn check_requirements(
upload_config: &UploadConfig,
size: u64,
password: Option<String>,
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keep_for: &Duration,
config: &config::Config,
) -> Result<(), error::Error> {
if let Some(original_name) = upload_config.original_name.as_ref() {
if original_name.len() > 255 {
return Err(error::ErrorBadRequest("filename is too long"));
}
}
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if *keep_for > MAX_UPLOAD_DURATION {
return Err(error::ErrorBadRequest(format!(
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"maximum allowed validity is {}, but you specified {}",
MAX_UPLOAD_DURATION, keep_for
)));
}
if let Some(no_auth_limits) = &config.no_auth_limits {
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let requires_auth = *keep_for > no_auth_limits.max_time
|| *keep_for > no_auth_limits.large_file_max_time
&& 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(())
}
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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())
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.ok_or(error::ParseError::Incomplete)?)
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}
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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();
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while let Some(chunk) = field.try_next().await.map_err(error::ErrorBadRequest)? {
data.extend(chunk);
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}
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Ok(data)
}
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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)
}
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async fn write_to_file(
file: &mut File,
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mut field: Field,
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max_size: Option<u64>,
) -> Result<u64, error::Error> {
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let mut written_bytes: u64 = 0;
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while let Some(chunk) = field.next().await {
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let chunk = chunk.map_err(error::ErrorBadRequest)?;
written_bytes += chunk.len() as u64;
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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")
})?;
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}
Ok(written_bytes)
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}
fn get_file_metadata(field: &actix_multipart::Field) -> (Mime, Option<String>) {
let mime = field.content_type().clone();
let filename = field
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.content_disposition()
.parameters
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.iter()
.find_map(|param| match param {
DispositionParam::Filename(filename) => Some(filename.clone()),
_ => None,
});
(mime, filename)
}
fn get_content_type(path: &Path) -> Mime {
let std_path = std::path::Path::new(path.as_os_str());
tree_magic_mini::from_filepath(std_path)
.and_then(|mime| mime.parse().ok())
.unwrap_or(TEXT_PLAIN)
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}