blob: d5eaa46db9b764656d9300e4a401ef8256fd34f2 [file] [log] [blame]
// Copyright (c) 2016 The Rouille developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.
//! Parsing data sent with `multipart/form-data`.
//!
//! > **Note**: You are encouraged to look at [the `post` module](../post/index.html) instead in
//! > order to parse data from HTML forms.
use std::error;
use std::fmt;
use Request;
use RequestBody;
use multipart::server::Multipart as InnerMultipart;
// TODO: provide wrappers around these
pub use multipart::server::MultipartField;
pub use multipart::server::MultipartData;
pub use multipart::server::MultipartFile;
/// Error that can happen when decoding multipart data.
#[derive(Clone, Debug)]
pub enum MultipartError {
/// The `Content-Type` header of the request indicates that it doesn't contain multipart data
/// or is invalid.
WrongContentType,
/// Can't parse the body of the request because it was already extracted.
BodyAlreadyExtracted,
}
impl error::Error for MultipartError {
#[inline]
fn description(&self) -> &str {
match *self {
MultipartError::WrongContentType => {
"the `Content-Type` header of the request indicates that it doesn't contain \
multipart data or is invalid"
},
MultipartError::BodyAlreadyExtracted => {
"can't parse the body of the request because it was already extracted"
},
}
}
}
impl fmt::Display for MultipartError {
#[inline]
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(fmt, "{}", error::Error::description(self))
}
}
/// Attempts to decode the content of the request as `multipart/form-data` data.
pub fn get_multipart_input(request: &Request) -> Result<Multipart, MultipartError> {
let boundary = match multipart_boundary(request) {
Some(b) => b,
None => return Err(MultipartError::WrongContentType)
};
let request_body = if let Some(body) = request.data() {
body
} else {
return Err(MultipartError::BodyAlreadyExtracted);
};
Ok(Multipart {
inner: InnerMultipart::with_body(request_body, boundary)
})
}
/// Allows you to inspect the content of the multipart input of a request.
pub struct Multipart<'a> {
inner: InnerMultipart<RequestBody<'a>>
}
impl<'a> Multipart<'a> {
pub fn next(&mut self) -> Option<MultipartField<&mut InnerMultipart<RequestBody<'a>>>> {
self.inner.read_entry().unwrap_or(None)
}
}
fn multipart_boundary(request: &Request) -> Option<String> {
const BOUNDARY: &str = "boundary=";
let content_type = match request.header("Content-Type") {
None => return None,
Some(c) => c
};
let start = match content_type.find(BOUNDARY) {
Some(pos) => pos + BOUNDARY.len(),
None => return None
};
let end = content_type[start..].find(';').map_or(content_type.len(), |end| start + end);
Some(content_type[start .. end].to_owned())
}