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// # References
//
// "The Content-Disposition Header Field" https://www.ietf.org/rfc/rfc2183.txt
// "The Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)" https://www.ietf.org/rfc/rfc6266.txt
// "Returning Values from Forms: multipart/form-data" https://www.ietf.org/rfc/rfc2388.txt
// Browser conformance tests at: http://greenbytes.de/tech/tc2231/
// IANA assignment: http://www.iana.org/assignments/cont-disp/cont-disp.xhtml
use language_tags::LanguageTag;
use std::fmt;
use unicase::UniCase;
use url::percent_encoding;
use header::{Header, HeaderFormat, parsing};
use header::parsing::{parse_extended_value, HTTP_VALUE};
use header::shared::Charset;
/// The implied disposition of the content of the HTTP body
#[derive(Clone, Debug, PartialEq)]
pub enum DispositionType {
/// Inline implies default processing
Inline,
/// Attachment implies that the recipient should prompt the user to save the response locally,
/// rather than process it normally (as per its media type).
Attachment,
/// Extension type. Should be handled by recipients the same way as Attachment
Ext(String)
}
/// A parameter to the disposition type
#[derive(Clone, Debug, PartialEq)]
pub enum DispositionParam {
/// A Filename consisting of a Charset, an optional LanguageTag, and finally a sequence of
/// bytes representing the filename
Filename(Charset, Option<LanguageTag>, Vec<u8>),
/// Extension type consisting of token and value. Recipients should ignore unrecognized
/// parameters.
Ext(String, String)
}
/// A `Content-Disposition` header, (re)defined in [RFC6266](https://tools.ietf.org/html/rfc6266)
///
/// The Content-Disposition response header field is used to convey
/// additional information about how to process the response payload, and
/// also can be used to attach additional metadata, such as the filename
/// to use when saving the response payload locally.
///
/// # ABNF
/// ```plain
/// content-disposition = "Content-Disposition" ":"
/// disposition-type *( ";" disposition-parm )
///
/// disposition-type = "inline" | "attachment" | disp-ext-type
/// ; case-insensitive
///
/// disp-ext-type = token
///
/// disposition-parm = filename-parm | disp-ext-parm
///
/// filename-parm = "filename" "=" value
/// | "filename*" "=" ext-value
///
/// disp-ext-parm = token "=" value
/// | ext-token "=" ext-value
///
/// ext-token = <the characters in token, followed by "*">
/// ```
///
/// # Example
/// ```
/// use hyper::header::{Headers, ContentDisposition, DispositionType, DispositionParam, Charset};
///
/// let mut headers = Headers::new();
/// headers.set(ContentDisposition {
/// disposition: DispositionType::Attachment,
/// parameters: vec![DispositionParam::Filename(
/// Charset::Iso_8859_1, // The character set for the bytes of the filename
/// None, // The optional language tag (see `language-tag` crate)
/// b"\xa9 Copyright 1989.txt".to_vec() // the actual bytes of the filename
/// )]
/// });
/// ```
#[derive(Clone, Debug, PartialEq)]
pub struct ContentDisposition {
/// The disposition
pub disposition: DispositionType,
/// Disposition parameters
pub parameters: Vec<DispositionParam>,
}
impl Header for ContentDisposition {
fn header_name() -> &'static str {
"Content-Disposition"
}
fn parse_header(raw: &[Vec<u8>]) -> ::Result<ContentDisposition> {
parsing::from_one_raw_str(raw).and_then(|s: String| {
let mut sections = s.split(';');
let disposition = match sections.next() {
Some(s) => s.trim(),
None => return Err(::Error::Header),
};
let mut cd = ContentDisposition {
disposition: if UniCase(&*disposition) == UniCase("inline") {
DispositionType::Inline
} else if UniCase(&*disposition) == UniCase("attachment") {
DispositionType::Attachment
} else {
DispositionType::Ext(disposition.to_owned())
},
parameters: Vec::new(),
};
for section in sections {
let mut parts = section.splitn(2, '=');
let key = if let Some(key) = parts.next() {
key.trim()
} else {
return Err(::Error::Header);
};
let val = if let Some(val) = parts.next() {
val.trim()
} else {
return Err(::Error::Header);
};
cd.parameters.push(
if UniCase(&*key) == UniCase("filename") {
DispositionParam::Filename(
Charset::Ext("UTF-8".to_owned()), None,
val.trim_matches('"').as_bytes().to_owned())
} else if UniCase(&*key) == UniCase("filename*") {
let extended_value = try!(parse_extended_value(val));
DispositionParam::Filename(extended_value.charset, extended_value.language_tag, extended_value.value)
} else {
DispositionParam::Ext(key.to_owned(), val.trim_matches('"').to_owned())
}
);
}
Ok(cd)
})
}
}
impl HeaderFormat for ContentDisposition {
#[inline]
fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&self, f)
}
}
impl fmt::Display for ContentDisposition {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.disposition {
DispositionType::Inline => try!(write!(f, "inline")),
DispositionType::Attachment => try!(write!(f, "attachment")),
DispositionType::Ext(ref s) => try!(write!(f, "{}", s)),
}
for param in &self.parameters {
match *param {
DispositionParam::Filename(ref charset, ref opt_lang, ref bytes) => {
let mut use_simple_format: bool = false;
if opt_lang.is_none() {
if let Charset::Ext(ref ext) = *charset {
if UniCase(&**ext) == UniCase("utf-8") {
use_simple_format = true;
}
}
}
if use_simple_format {
try!(write!(f, "; filename=\"{}\"",
match String::from_utf8(bytes.clone()) {
Ok(s) => s,
Err(_) => return Err(fmt::Error),
}));
} else {
try!(write!(f, "; filename*={}'", charset));
if let Some(ref lang) = *opt_lang {
try!(write!(f, "{}", lang));
};
try!(write!(f, "'"));
try!(f.write_str(
&percent_encoding::percent_encode(bytes, HTTP_VALUE).to_string()))
}
},
DispositionParam::Ext(ref k, ref v) => try!(write!(f, "; {}=\"{}\"", k, v)),
}
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::{ContentDisposition,DispositionType,DispositionParam};
use ::header::Header;
use ::header::shared::Charset;
#[test]
fn test_parse_header() {
assert!(ContentDisposition::parse_header([b"".to_vec()].as_ref()).is_err());
let a = [b"form-data; dummy=3; name=upload;\r\n filename=\"sample.png\"".to_vec()];
let a: ContentDisposition = ContentDisposition::parse_header(a.as_ref()).unwrap();
let b = ContentDisposition {
disposition: DispositionType::Ext("form-data".to_owned()),
parameters: vec![
DispositionParam::Ext("dummy".to_owned(), "3".to_owned()),
DispositionParam::Ext("name".to_owned(), "upload".to_owned()),
DispositionParam::Filename(
Charset::Ext("UTF-8".to_owned()),
None,
"sample.png".bytes().collect()) ]
};
assert_eq!(a, b);
let a = [b"attachment; filename=\"image.jpg\"".to_vec()];
let a: ContentDisposition = ContentDisposition::parse_header(a.as_ref()).unwrap();
let b = ContentDisposition {
disposition: DispositionType::Attachment,
parameters: vec![
DispositionParam::Filename(
Charset::Ext("UTF-8".to_owned()),
None,
"image.jpg".bytes().collect()) ]
};
assert_eq!(a, b);
let a = [b"attachment; filename*=UTF-8''%c2%a3%20and%20%e2%82%ac%20rates".to_vec()];
let a: ContentDisposition = ContentDisposition::parse_header(a.as_ref()).unwrap();
let b = ContentDisposition {
disposition: DispositionType::Attachment,
parameters: vec![
DispositionParam::Filename(
Charset::Ext("UTF-8".to_owned()),
None,
vec![0xc2, 0xa3, 0x20, b'a', b'n', b'd', 0x20,
0xe2, 0x82, 0xac, 0x20, b'r', b'a', b't', b'e', b's']) ]
};
assert_eq!(a, b);
}
#[test]
fn test_display() {
let a = [b"attachment; filename*=UTF-8'en'%C2%A3%20and%20%E2%82%AC%20rates".to_vec()];
let as_string = ::std::str::from_utf8(&(a[0])).unwrap();
let a: ContentDisposition = ContentDisposition::parse_header(a.as_ref()).unwrap();
let display_rendered = format!("{}",a);
assert_eq!(as_string, display_rendered);
let a = [b"attachment; filename*=UTF-8''black%20and%20white.csv".to_vec()];
let a: ContentDisposition = ContentDisposition::parse_header(a.as_ref()).unwrap();
let display_rendered = format!("{}",a);
assert_eq!("attachment; filename=\"black and white.csv\"".to_owned(), display_rendered);
let a = [b"attachment; filename=colourful.csv".to_vec()];
let a: ContentDisposition = ContentDisposition::parse_header(a.as_ref()).unwrap();
let display_rendered = format!("{}",a);
assert_eq!("attachment; filename=\"colourful.csv\"".to_owned(), display_rendered);
}
}