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use std::borrow::Cow;
use std::fmt;
use std::pin::Pin;
use bytes::Bytes;
use http::HeaderMap;
use mime_guess::Mime;
use percent_encoding::{self, AsciiSet, NON_ALPHANUMERIC};
use futures_core::Stream;
use futures_util::{future, stream, StreamExt};
use super::Body;
pub struct Form {
inner: FormParts<Part>,
}
pub struct Part {
meta: PartMetadata,
value: Body,
body_length: Option<u64>,
}
pub(crate) struct FormParts<P> {
pub(crate) boundary: String,
pub(crate) computed_headers: Vec<Vec<u8>>,
pub(crate) fields: Vec<(Cow<'static, str>, P)>,
pub(crate) percent_encoding: PercentEncoding,
}
pub(crate) struct PartMetadata {
mime: Option<Mime>,
file_name: Option<Cow<'static, str>>,
pub(crate) headers: HeaderMap,
}
pub(crate) trait PartProps {
fn value_len(&self) -> Option<u64>;
fn metadata(&self) -> &PartMetadata;
}
impl Default for Form {
fn default() -> Self {
Self::new()
}
}
impl Form {
pub fn new() -> Form {
Form {
inner: FormParts::new(),
}
}
#[inline]
pub fn boundary(&self) -> &str {
self.inner.boundary()
}
pub fn text<T, U>(self, name: T, value: U) -> Form
where
T: Into<Cow<'static, str>>,
U: Into<Cow<'static, str>>,
{
self.part(name, Part::text(value))
}
pub fn part<T>(self, name: T, part: Part) -> Form
where
T: Into<Cow<'static, str>>,
{
self.with_inner(move |inner| inner.part(name, part))
}
pub fn percent_encode_path_segment(self) -> Form {
self.with_inner(|inner| inner.percent_encode_path_segment())
}
pub fn percent_encode_attr_chars(self) -> Form {
self.with_inner(|inner| inner.percent_encode_attr_chars())
}
pub fn percent_encode_noop(self) -> Form {
self.with_inner(|inner| inner.percent_encode_noop())
}
pub(crate) fn stream(mut self) -> Body {
if self.inner.fields.is_empty() {
return Body::empty();
}
let (name, part) = self.inner.fields.remove(0);
let start = Box::pin(self.part_stream(name, part))
as Pin<Box<dyn Stream<Item = crate::Result<Bytes>> + Send + Sync>>;
let fields = self.inner.take_fields();
let stream = fields.into_iter().fold(start, |memo, (name, part)| {
let part_stream = self.part_stream(name, part);
Box::pin(memo.chain(part_stream))
as Pin<Box<dyn Stream<Item = crate::Result<Bytes>> + Send + Sync>>
});
let last = stream::once(future::ready(Ok(
format!("--{}--\r\n", self.boundary()).into()
)));
Body::stream(stream.chain(last))
}
pub(crate) fn part_stream<T>(
&mut self,
name: T,
part: Part,
) -> impl Stream<Item = Result<Bytes, crate::Error>>
where
T: Into<Cow<'static, str>>,
{
let boundary = stream::once(future::ready(Ok(
format!("--{}\r\n", self.boundary()).into()
)));
let header = stream::once(future::ready(Ok({
let mut h = self
.inner
.percent_encoding
.encode_headers(&name.into(), &part.meta);
h.extend_from_slice(b"\r\n\r\n");
h.into()
})));
boundary
.chain(header)
.chain(part.value.into_stream())
.chain(stream::once(future::ready(Ok("\r\n".into()))))
}
pub(crate) fn compute_length(&mut self) -> Option<u64> {
self.inner.compute_length()
}
fn with_inner<F>(self, func: F) -> Self
where
F: FnOnce(FormParts<Part>) -> FormParts<Part>,
{
Form {
inner: func(self.inner),
}
}
}
impl fmt::Debug for Form {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.inner.fmt_fields("Form", f)
}
}
impl Part {
pub fn text<T>(value: T) -> Part
where
T: Into<Cow<'static, str>>,
{
let body = match value.into() {
Cow::Borrowed(slice) => Body::from(slice),
Cow::Owned(string) => Body::from(string),
};
Part::new(body, None)
}
pub fn bytes<T>(value: T) -> Part
where
T: Into<Cow<'static, [u8]>>,
{
let body = match value.into() {
Cow::Borrowed(slice) => Body::from(slice),
Cow::Owned(vec) => Body::from(vec),
};
Part::new(body, None)
}
pub fn stream<T: Into<Body>>(value: T) -> Part {
Part::new(value.into(), None)
}
pub fn stream_with_length<T: Into<Body>>(value: T, length: u64) -> Part {
Part::new(value.into(), Some(length))
}
fn new(value: Body, body_length: Option<u64>) -> Part {
Part {
meta: PartMetadata::new(),
value,
body_length,
}
}
pub fn mime_str(self, mime: &str) -> crate::Result<Part> {
Ok(self.mime(mime.parse().map_err(crate::error::builder)?))
}
fn mime(self, mime: Mime) -> Part {
self.with_inner(move |inner| inner.mime(mime))
}
pub fn file_name<T>(self, filename: T) -> Part
where
T: Into<Cow<'static, str>>,
{
self.with_inner(move |inner| inner.file_name(filename))
}
fn with_inner<F>(self, func: F) -> Self
where
F: FnOnce(PartMetadata) -> PartMetadata,
{
Part {
meta: func(self.meta),
..self
}
}
}
impl fmt::Debug for Part {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut dbg = f.debug_struct("Part");
dbg.field("value", &self.value);
self.meta.fmt_fields(&mut dbg);
dbg.finish()
}
}
impl PartProps for Part {
fn value_len(&self) -> Option<u64> {
if self.body_length.is_some() {
self.body_length
} else {
self.value.content_length()
}
}
fn metadata(&self) -> &PartMetadata {
&self.meta
}
}
impl<P: PartProps> FormParts<P> {
pub(crate) fn new() -> Self {
FormParts {
boundary: gen_boundary(),
computed_headers: Vec::new(),
fields: Vec::new(),
percent_encoding: PercentEncoding::PathSegment,
}
}
pub(crate) fn boundary(&self) -> &str {
&self.boundary
}
pub(crate) fn part<T>(mut self, name: T, part: P) -> Self
where
T: Into<Cow<'static, str>>,
{
self.fields.push((name.into(), part));
self
}
pub(crate) fn percent_encode_path_segment(mut self) -> Self {
self.percent_encoding = PercentEncoding::PathSegment;
self
}
pub(crate) fn percent_encode_attr_chars(mut self) -> Self {
self.percent_encoding = PercentEncoding::AttrChar;
self
}
pub(crate) fn percent_encode_noop(mut self) -> Self {
self.percent_encoding = PercentEncoding::NoOp;
self
}
pub(crate) fn compute_length(&mut self) -> Option<u64> {
let mut length = 0u64;
for &(ref name, ref field) in self.fields.iter() {
match field.value_len() {
Some(value_length) => {
let header = self.percent_encoding.encode_headers(name, field.metadata());
let header_length = header.len();
self.computed_headers.push(header);
length += 2
+ self.boundary().len() as u64
+ 2
+ header_length as u64
+ 4
+ value_length
+ 2
}
_ => return None,
}
}
if !self.fields.is_empty() {
length += 2 + self.boundary().len() as u64 + 4
}
Some(length)
}
fn take_fields(&mut self) -> Vec<(Cow<'static, str>, P)> {
std::mem::replace(&mut self.fields, Vec::new())
}
}
impl<P: fmt::Debug> FormParts<P> {
pub(crate) fn fmt_fields(&self, ty_name: &'static str, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct(ty_name)
.field("boundary", &self.boundary)
.field("parts", &self.fields)
.finish()
}
}
impl PartMetadata {
pub(crate) fn new() -> Self {
PartMetadata {
mime: None,
file_name: None,
headers: HeaderMap::default(),
}
}
pub(crate) fn mime(mut self, mime: Mime) -> Self {
self.mime = Some(mime);
self
}
pub(crate) fn file_name<T>(mut self, filename: T) -> Self
where
T: Into<Cow<'static, str>>,
{
self.file_name = Some(filename.into());
self
}
}
impl PartMetadata {
pub(crate) fn fmt_fields<'f, 'fa, 'fb>(
&self,
debug_struct: &'f mut fmt::DebugStruct<'fa, 'fb>,
) -> &'f mut fmt::DebugStruct<'fa, 'fb> {
debug_struct
.field("mime", &self.mime)
.field("file_name", &self.file_name)
.field("headers", &self.headers)
}
}
const FRAGMENT_ENCODE_SET: &AsciiSet = &percent_encoding::CONTROLS
.add(b' ')
.add(b'"')
.add(b'<')
.add(b'>')
.add(b'`');
const PATH_ENCODE_SET: &AsciiSet = &FRAGMENT_ENCODE_SET.add(b'#').add(b'?').add(b'{').add(b'}');
const PATH_SEGMENT_ENCODE_SET: &AsciiSet = &PATH_ENCODE_SET.add(b'/').add(b'%');
const ATTR_CHAR_ENCODE_SET: &AsciiSet = &NON_ALPHANUMERIC
.remove(b'!')
.remove(b'#')
.remove(b'$')
.remove(b'&')
.remove(b'+')
.remove(b'-')
.remove(b'.')
.remove(b'^')
.remove(b'_')
.remove(b'`')
.remove(b'|')
.remove(b'~');
pub(crate) enum PercentEncoding {
PathSegment,
AttrChar,
NoOp,
}
impl PercentEncoding {
pub(crate) fn encode_headers(&self, name: &str, field: &PartMetadata) -> Vec<u8> {
let s = format!(
"Content-Disposition: form-data; {}{}{}",
self.format_parameter("name", name),
match field.file_name {
Some(ref file_name) => format!("; {}", self.format_filename(file_name)),
None => String::new(),
},
match field.mime {
Some(ref mime) => format!("\r\nContent-Type: {}", mime),
None => "".to_string(),
},
);
field
.headers
.iter()
.fold(s.into_bytes(), |mut header, (k, v)| {
header.extend_from_slice(b"\r\n");
header.extend_from_slice(k.as_str().as_bytes());
header.extend_from_slice(b": ");
header.extend_from_slice(v.as_bytes());
header
})
}
fn format_filename(&self, filename: &str) -> String {
let legal_filename = filename
.replace("\\", "\\\\")
.replace("\"", "\\\"")
.replace("\r", "\\\r")
.replace("\n", "\\\n");
format!("filename=\"{}\"", legal_filename)
}
fn format_parameter(&self, name: &str, value: &str) -> String {
let legal_value = match *self {
PercentEncoding::PathSegment => {
percent_encoding::utf8_percent_encode(value, PATH_SEGMENT_ENCODE_SET).to_string()
}
PercentEncoding::AttrChar => {
percent_encoding::utf8_percent_encode(value, ATTR_CHAR_ENCODE_SET).to_string()
}
PercentEncoding::NoOp => value.to_string(),
};
if value.len() == legal_value.len() {
format!("{}=\"{}\"", name, value)
} else {
format!("{}*=utf-8''{}", name, legal_value)
}
}
}
fn gen_boundary() -> String {
use crate::util::fast_random as random;
let a = random();
let b = random();
let c = random();
let d = random();
format!("{:016x}-{:016x}-{:016x}-{:016x}", a, b, c, d)
}
#[cfg(test)]
mod tests {
use super::*;
use futures_util::TryStreamExt;
use futures_util::{future, stream};
use tokio::{self, runtime};
#[test]
fn form_empty() {
let form = Form::new();
let rt = runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("new rt");
let body = form.stream().into_stream();
let s = body.map_ok(|try_c| try_c.to_vec()).try_concat();
let out = rt.block_on(s);
assert!(out.unwrap().is_empty());
}
#[test]
fn stream_to_end() {
let mut form = Form::new()
.part(
"reader1",
Part::stream(Body::stream(stream::once(future::ready::<
Result<String, crate::Error>,
>(Ok(
"part1".to_owned()
))))),
)
.part("key1", Part::text("value1"))
.part("key2", Part::text("value2").mime(mime::IMAGE_BMP))
.part(
"reader2",
Part::stream(Body::stream(stream::once(future::ready::<
Result<String, crate::Error>,
>(Ok(
"part2".to_owned()
))))),
)
.part("key3", Part::text("value3").file_name("filename"));
form.inner.boundary = "boundary".to_string();
let expected = "--boundary\r\n\
Content-Disposition: form-data; name=\"reader1\"\r\n\r\n\
part1\r\n\
--boundary\r\n\
Content-Disposition: form-data; name=\"key1\"\r\n\r\n\
value1\r\n\
--boundary\r\n\
Content-Disposition: form-data; name=\"key2\"\r\n\
Content-Type: image/bmp\r\n\r\n\
value2\r\n\
--boundary\r\n\
Content-Disposition: form-data; name=\"reader2\"\r\n\r\n\
part2\r\n\
--boundary\r\n\
Content-Disposition: form-data; name=\"key3\"; filename=\"filename\"\r\n\r\n\
value3\r\n--boundary--\r\n";
let rt = runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("new rt");
let body = form.stream().into_stream();
let s = body.map(|try_c| try_c.map(|r| r.to_vec())).try_concat();
let out = rt.block_on(s).unwrap();
println!(
"START REAL\n{}\nEND REAL",
std::str::from_utf8(&out).unwrap()
);
println!("START EXPECTED\n{}\nEND EXPECTED", expected);
assert_eq!(std::str::from_utf8(&out).unwrap(), expected);
}
#[test]
fn stream_to_end_with_header() {
let mut part = Part::text("value2").mime(mime::IMAGE_BMP);
part.meta.headers.insert("Hdr3", "/a/b/c".parse().unwrap());
let mut form = Form::new().part("key2", part);
form.inner.boundary = "boundary".to_string();
let expected = "--boundary\r\n\
Content-Disposition: form-data; name=\"key2\"\r\n\
Content-Type: image/bmp\r\n\
hdr3: /a/b/c\r\n\
\r\n\
value2\r\n\
--boundary--\r\n";
let rt = runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("new rt");
let body = form.stream().into_stream();
let s = body.map(|try_c| try_c.map(|r| r.to_vec())).try_concat();
let out = rt.block_on(s).unwrap();
println!(
"START REAL\n{}\nEND REAL",
std::str::from_utf8(&out).unwrap()
);
println!("START EXPECTED\n{}\nEND EXPECTED", expected);
assert_eq!(std::str::from_utf8(&out).unwrap(), expected);
}
#[test]
fn correct_content_length() {
let stream_data = b"just some stream data";
let stream_len = stream_data.len();
let stream_data = stream_data
.chunks(3)
.map(|c| Ok::<_, std::io::Error>(Bytes::from(c)));
let the_stream = futures_util::stream::iter(stream_data);
let bytes_data = b"some bytes data".to_vec();
let bytes_len = bytes_data.len();
let stream_part = Part::stream_with_length(Body::stream(the_stream), stream_len as u64);
let body_part = Part::bytes(bytes_data);
assert_eq!(stream_part.value_len().unwrap(), stream_len as u64);
assert_eq!(body_part.value_len().unwrap(), bytes_len as u64);
}
#[test]
fn header_percent_encoding() {
let name = "start%'\"\r\nßend";
let field = Part::text("");
assert_eq!(
PercentEncoding::PathSegment.encode_headers(name, &field.meta),
&b"Content-Disposition: form-data; name*=utf-8''start%25'%22%0D%0A%C3%9Fend"[..]
);
assert_eq!(
PercentEncoding::AttrChar.encode_headers(name, &field.meta),
&b"Content-Disposition: form-data; name*=utf-8''start%25%27%22%0D%0A%C3%9Fend"[..]
);
}
}