| // 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; |
| |
| /// 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()) |
| } |
| |