912 lines
25 KiB
Rust
912 lines
25 KiB
Rust
use super::{util, StreamDependency, StreamId};
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use crate::frame::{Error, Frame, Head, Kind};
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use crate::hpack;
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use http::{uri, HeaderMap, Method, StatusCode, Uri};
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use http::header::{self, HeaderName, HeaderValue};
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use byteorder::{BigEndian, ByteOrder};
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use bytes::{Bytes, BytesMut};
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use string::String;
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use std::fmt;
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use std::io::Cursor;
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// Minimum MAX_FRAME_SIZE is 16kb, so save some arbitrary space for frame
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// head and other header bits.
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const MAX_HEADER_LENGTH: usize = 1024 * 16 - 100;
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/// Header frame
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///
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/// This could be either a request or a response.
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#[derive(Eq, PartialEq)]
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pub struct Headers {
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/// The ID of the stream with which this frame is associated.
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stream_id: StreamId,
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/// The stream dependency information, if any.
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stream_dep: Option<StreamDependency>,
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/// The header block fragment
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header_block: HeaderBlock,
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/// The associated flags
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flags: HeadersFlag,
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}
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#[derive(Copy, Clone, Eq, PartialEq)]
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pub struct HeadersFlag(u8);
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#[derive(Eq, PartialEq)]
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pub struct PushPromise {
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/// The ID of the stream with which this frame is associated.
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stream_id: StreamId,
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/// The ID of the stream being reserved by this PushPromise.
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promised_id: StreamId,
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/// The header block fragment
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header_block: HeaderBlock,
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/// The associated flags
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flags: PushPromiseFlag,
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}
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#[derive(Copy, Clone, Eq, PartialEq)]
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pub struct PushPromiseFlag(u8);
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#[derive(Debug)]
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pub struct Continuation {
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/// Stream ID of continuation frame
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stream_id: StreamId,
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header_block: EncodingHeaderBlock,
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}
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// TODO: These fields shouldn't be `pub`
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#[derive(Debug, Default, Eq, PartialEq)]
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pub struct Pseudo {
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// Request
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pub method: Option<Method>,
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pub scheme: Option<String<Bytes>>,
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pub authority: Option<String<Bytes>>,
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pub path: Option<String<Bytes>>,
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// Response
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pub status: Option<StatusCode>,
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}
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#[derive(Debug)]
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pub struct Iter {
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/// Pseudo headers
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pseudo: Option<Pseudo>,
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/// Header fields
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fields: header::IntoIter<HeaderValue>,
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}
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#[derive(Debug, PartialEq, Eq)]
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struct HeaderBlock {
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/// The decoded header fields
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fields: HeaderMap,
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/// Set to true if decoding went over the max header list size.
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is_over_size: bool,
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/// Pseudo headers, these are broken out as they must be sent as part of the
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/// headers frame.
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pseudo: Pseudo,
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}
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#[derive(Debug)]
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struct EncodingHeaderBlock {
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/// Argument to pass to the HPACK encoder to resume encoding
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hpack: Option<hpack::EncodeState>,
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/// remaining headers to encode
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headers: Iter,
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}
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const END_STREAM: u8 = 0x1;
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const END_HEADERS: u8 = 0x4;
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const PADDED: u8 = 0x8;
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const PRIORITY: u8 = 0x20;
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const ALL: u8 = END_STREAM | END_HEADERS | PADDED | PRIORITY;
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// ===== impl Headers =====
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impl Headers {
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/// Create a new HEADERS frame
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pub fn new(stream_id: StreamId, pseudo: Pseudo, fields: HeaderMap) -> Self {
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Headers {
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stream_id: stream_id,
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stream_dep: None,
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header_block: HeaderBlock {
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fields: fields,
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is_over_size: false,
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pseudo: pseudo,
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},
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flags: HeadersFlag::default(),
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}
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}
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pub fn trailers(stream_id: StreamId, fields: HeaderMap) -> Self {
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let mut flags = HeadersFlag::default();
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flags.set_end_stream();
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Headers {
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stream_id,
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stream_dep: None,
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header_block: HeaderBlock {
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fields: fields,
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is_over_size: false,
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pseudo: Pseudo::default(),
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},
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flags: flags,
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}
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}
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/// Loads the header frame but doesn't actually do HPACK decoding.
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///
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/// HPACK decoding is done in the `load_hpack` step.
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pub fn load(head: Head, mut src: BytesMut) -> Result<(Self, BytesMut), Error> {
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let flags = HeadersFlag(head.flag());
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let mut pad = 0;
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log::trace!("loading headers; flags={:?}", flags);
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// Read the padding length
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if flags.is_padded() {
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if src.len() < 1 {
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return Err(Error::MalformedMessage);
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}
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pad = src[0] as usize;
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// Drop the padding
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let _ = src.split_to(1);
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}
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// Read the stream dependency
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let stream_dep = if flags.is_priority() {
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if src.len() < 5 {
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return Err(Error::MalformedMessage);
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}
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let stream_dep = StreamDependency::load(&src[..5])?;
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if stream_dep.dependency_id() == head.stream_id() {
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return Err(Error::InvalidDependencyId);
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}
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// Drop the next 5 bytes
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let _ = src.split_to(5);
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Some(stream_dep)
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} else {
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None
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};
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if pad > 0 {
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if pad > src.len() {
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return Err(Error::TooMuchPadding);
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}
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let len = src.len() - pad;
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src.truncate(len);
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}
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let headers = Headers {
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stream_id: head.stream_id(),
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stream_dep: stream_dep,
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header_block: HeaderBlock {
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fields: HeaderMap::new(),
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is_over_size: false,
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pseudo: Pseudo::default(),
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},
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flags: flags,
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};
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Ok((headers, src))
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}
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pub fn load_hpack(&mut self, src: &mut BytesMut, max_header_list_size: usize, decoder: &mut hpack::Decoder) -> Result<(), Error> {
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self.header_block.load(src, max_header_list_size, decoder)
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}
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pub fn stream_id(&self) -> StreamId {
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self.stream_id
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}
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pub fn is_end_headers(&self) -> bool {
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self.flags.is_end_headers()
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}
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pub fn set_end_headers(&mut self) {
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self.flags.set_end_headers();
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}
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pub fn is_end_stream(&self) -> bool {
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self.flags.is_end_stream()
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}
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pub fn set_end_stream(&mut self) {
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self.flags.set_end_stream()
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}
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pub fn is_over_size(&self) -> bool {
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self.header_block.is_over_size
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}
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pub(crate) fn has_too_big_field(&self) -> bool {
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self.header_block.has_too_big_field()
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}
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pub fn into_parts(self) -> (Pseudo, HeaderMap) {
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(self.header_block.pseudo, self.header_block.fields)
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}
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#[cfg(feature = "unstable")]
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pub fn pseudo_mut(&mut self) -> &mut Pseudo {
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&mut self.header_block.pseudo
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}
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pub fn fields(&self) -> &HeaderMap {
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&self.header_block.fields
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}
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pub fn into_fields(self) -> HeaderMap {
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self.header_block.fields
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}
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pub fn encode(self, encoder: &mut hpack::Encoder, dst: &mut BytesMut) -> Option<Continuation> {
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// At this point, the `is_end_headers` flag should always be set
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debug_assert!(self.flags.is_end_headers());
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// Get the HEADERS frame head
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let head = self.head();
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self.header_block.into_encoding()
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.encode(&head, encoder, dst, |_| {
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})
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}
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fn head(&self) -> Head {
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Head::new(Kind::Headers, self.flags.into(), self.stream_id)
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}
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}
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impl<T> From<Headers> for Frame<T> {
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fn from(src: Headers) -> Self {
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Frame::Headers(src)
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}
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}
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impl fmt::Debug for Headers {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let mut builder = f.debug_struct("Headers");
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builder
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.field("stream_id", &self.stream_id)
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.field("flags", &self.flags);
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if let Some(ref dep) = self.stream_dep {
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builder.field("stream_dep", dep);
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}
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// `fields` and `pseudo` purposefully not included
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builder.finish()
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}
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}
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// ===== impl PushPromise =====
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impl PushPromise {
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/// Loads the push promise frame but doesn't actually do HPACK decoding.
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///
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/// HPACK decoding is done in the `load_hpack` step.
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pub fn load(head: Head, mut src: BytesMut) -> Result<(Self, BytesMut), Error> {
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let flags = PushPromiseFlag(head.flag());
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let mut pad = 0;
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// Read the padding length
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if flags.is_padded() {
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if src.len() < 1 {
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return Err(Error::MalformedMessage);
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}
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// TODO: Ensure payload is sized correctly
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pad = src[0] as usize;
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// Drop the padding
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let _ = src.split_to(1);
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}
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if src.len() < 5 {
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return Err(Error::MalformedMessage);
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}
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let (promised_id, _) = StreamId::parse(&src[..4]);
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// Drop promised_id bytes
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let _ = src.split_to(4);
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if pad > 0 {
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if pad > src.len() {
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return Err(Error::TooMuchPadding);
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}
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let len = src.len() - pad;
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src.truncate(len);
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}
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let frame = PushPromise {
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flags: flags,
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header_block: HeaderBlock {
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fields: HeaderMap::new(),
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is_over_size: false,
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pseudo: Pseudo::default(),
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},
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promised_id: promised_id,
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stream_id: head.stream_id(),
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};
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Ok((frame, src))
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}
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pub fn load_hpack(&mut self, src: &mut BytesMut, max_header_list_size: usize, decoder: &mut hpack::Decoder) -> Result<(), Error> {
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self.header_block.load(src, max_header_list_size, decoder)
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}
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pub fn stream_id(&self) -> StreamId {
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self.stream_id
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}
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pub fn promised_id(&self) -> StreamId {
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self.promised_id
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}
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pub fn is_end_headers(&self) -> bool {
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self.flags.is_end_headers()
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}
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pub fn set_end_headers(&mut self) {
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self.flags.set_end_headers();
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}
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pub fn is_over_size(&self) -> bool {
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self.header_block.is_over_size
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}
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pub fn encode(self, encoder: &mut hpack::Encoder, dst: &mut BytesMut) -> Option<Continuation> {
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use bytes::BufMut;
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// At this point, the `is_end_headers` flag should always be set
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debug_assert!(self.flags.is_end_headers());
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let head = self.head();
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let promised_id = self.promised_id;
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self.header_block.into_encoding()
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.encode(&head, encoder, dst, |dst| {
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dst.put_u32_be(promised_id.into());
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})
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}
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fn head(&self) -> Head {
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Head::new(Kind::PushPromise, self.flags.into(), self.stream_id)
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}
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}
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impl PushPromise {
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/// Consume `self`, returning the parts of the frame
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pub fn into_parts(self) -> (Pseudo, HeaderMap) {
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(self.header_block.pseudo, self.header_block.fields)
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}
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}
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#[cfg(feature = "unstable")]
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impl PushPromise {
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pub fn new(
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stream_id: StreamId,
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promised_id: StreamId,
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pseudo: Pseudo,
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fields: HeaderMap,
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) -> Self {
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PushPromise {
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flags: PushPromiseFlag::default(),
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header_block: HeaderBlock {
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fields,
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is_over_size: false,
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pseudo,
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},
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promised_id,
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stream_id,
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}
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}
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pub fn fields(&self) -> &HeaderMap {
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&self.header_block.fields
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}
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pub fn into_fields(self) -> HeaderMap {
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self.header_block.fields
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}
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}
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impl<T> From<PushPromise> for Frame<T> {
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fn from(src: PushPromise) -> Self {
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Frame::PushPromise(src)
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}
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}
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impl fmt::Debug for PushPromise {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("PushPromise")
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.field("stream_id", &self.stream_id)
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.field("promised_id", &self.promised_id)
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.field("flags", &self.flags)
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// `fields` and `pseudo` purposefully not included
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.finish()
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}
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}
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// ===== impl Continuation =====
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impl Continuation {
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fn head(&self) -> Head {
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Head::new(Kind::Continuation, END_HEADERS, self.stream_id)
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}
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pub fn encode(self, encoder: &mut hpack::Encoder, dst: &mut BytesMut) -> Option<Continuation> {
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// Get the CONTINUATION frame head
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let head = self.head();
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self.header_block
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.encode(&head, encoder, dst, |_| {
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})
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}
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}
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// ===== impl Pseudo =====
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impl Pseudo {
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pub fn request(method: Method, uri: Uri) -> Self {
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let parts = uri::Parts::from(uri);
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let mut path = parts
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.path_and_query
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.map(|v| v.into())
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.unwrap_or_else(|| Bytes::new());
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if path.is_empty() && method != Method::OPTIONS {
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path = Bytes::from_static(b"/");
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}
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let mut pseudo = Pseudo {
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method: Some(method),
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scheme: None,
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authority: None,
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path: Some(to_string(path)),
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status: None,
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};
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// If the URI includes a scheme component, add it to the pseudo headers
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//
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// TODO: Scheme must be set...
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if let Some(scheme) = parts.scheme {
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pseudo.set_scheme(scheme);
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}
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// If the URI includes an authority component, add it to the pseudo
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// headers
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if let Some(authority) = parts.authority {
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pseudo.set_authority(to_string(authority.into()));
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}
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pseudo
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}
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pub fn response(status: StatusCode) -> Self {
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Pseudo {
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method: None,
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scheme: None,
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authority: None,
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path: None,
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status: Some(status),
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}
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}
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pub fn set_scheme(&mut self, scheme: uri::Scheme) {
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self.scheme = Some(to_string(scheme.into()));
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}
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pub fn set_authority(&mut self, authority: String<Bytes>) {
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self.authority = Some(authority);
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}
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}
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fn to_string(src: Bytes) -> String<Bytes> {
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unsafe { String::from_utf8_unchecked(src) }
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}
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// ===== impl EncodingHeaderBlock =====
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impl EncodingHeaderBlock {
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fn encode<F>(mut self,
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head: &Head,
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encoder: &mut hpack::Encoder,
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dst: &mut BytesMut,
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f: F)
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-> Option<Continuation>
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where F: FnOnce(&mut BytesMut),
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{
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let head_pos = dst.len();
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// At this point, we don't know how big the h2 frame will be.
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// So, we write the head with length 0, then write the body, and
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// finally write the length once we know the size.
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head.encode(0, dst);
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let payload_pos = dst.len();
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f(dst);
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// Now, encode the header payload
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let continuation = match encoder.encode(self.hpack, &mut self.headers, dst) {
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hpack::Encode::Full => None,
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hpack::Encode::Partial(state) => Some(Continuation {
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stream_id: head.stream_id(),
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header_block: EncodingHeaderBlock {
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hpack: Some(state),
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headers: self.headers,
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},
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}),
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};
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// Compute the header block length
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let payload_len = (dst.len() - payload_pos) as u64;
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// Write the frame length
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BigEndian::write_uint(&mut dst[head_pos..head_pos + 3], payload_len, 3);
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if continuation.is_some() {
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// There will be continuation frames, so the `is_end_headers` flag
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// must be unset
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debug_assert!(dst[head_pos + 4] & END_HEADERS == END_HEADERS);
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dst[head_pos + 4] -= END_HEADERS;
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}
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continuation
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}
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}
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// ===== impl Iter =====
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impl Iterator for Iter {
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type Item = hpack::Header<Option<HeaderName>>;
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fn next(&mut self) -> Option<Self::Item> {
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|
use crate::hpack::Header::*;
|
|
|
|
if let Some(ref mut pseudo) = self.pseudo {
|
|
if let Some(method) = pseudo.method.take() {
|
|
return Some(Method(method));
|
|
}
|
|
|
|
if let Some(scheme) = pseudo.scheme.take() {
|
|
return Some(Scheme(scheme));
|
|
}
|
|
|
|
if let Some(authority) = pseudo.authority.take() {
|
|
return Some(Authority(authority));
|
|
}
|
|
|
|
if let Some(path) = pseudo.path.take() {
|
|
return Some(Path(path));
|
|
}
|
|
|
|
if let Some(status) = pseudo.status.take() {
|
|
return Some(Status(status));
|
|
}
|
|
}
|
|
|
|
self.pseudo = None;
|
|
|
|
self.fields.next().map(|(name, value)| {
|
|
Field {
|
|
name: name,
|
|
value: value,
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
// ===== impl HeadersFlag =====
|
|
|
|
impl HeadersFlag {
|
|
pub fn empty() -> HeadersFlag {
|
|
HeadersFlag(0)
|
|
}
|
|
|
|
pub fn load(bits: u8) -> HeadersFlag {
|
|
HeadersFlag(bits & ALL)
|
|
}
|
|
|
|
pub fn is_end_stream(&self) -> bool {
|
|
self.0 & END_STREAM == END_STREAM
|
|
}
|
|
|
|
pub fn set_end_stream(&mut self) {
|
|
self.0 |= END_STREAM;
|
|
}
|
|
|
|
pub fn is_end_headers(&self) -> bool {
|
|
self.0 & END_HEADERS == END_HEADERS
|
|
}
|
|
|
|
pub fn set_end_headers(&mut self) {
|
|
self.0 |= END_HEADERS;
|
|
}
|
|
|
|
pub fn is_padded(&self) -> bool {
|
|
self.0 & PADDED == PADDED
|
|
}
|
|
|
|
pub fn is_priority(&self) -> bool {
|
|
self.0 & PRIORITY == PRIORITY
|
|
}
|
|
}
|
|
|
|
impl Default for HeadersFlag {
|
|
/// Returns a `HeadersFlag` value with `END_HEADERS` set.
|
|
fn default() -> Self {
|
|
HeadersFlag(END_HEADERS)
|
|
}
|
|
}
|
|
|
|
impl From<HeadersFlag> for u8 {
|
|
fn from(src: HeadersFlag) -> u8 {
|
|
src.0
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for HeadersFlag {
|
|
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
|
util::debug_flags(fmt, self.0)
|
|
.flag_if(self.is_end_headers(), "END_HEADERS")
|
|
.flag_if(self.is_end_stream(), "END_STREAM")
|
|
.flag_if(self.is_padded(), "PADDED")
|
|
.flag_if(self.is_priority(), "PRIORITY")
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
// ===== impl PushPromiseFlag =====
|
|
|
|
impl PushPromiseFlag {
|
|
pub fn empty() -> PushPromiseFlag {
|
|
PushPromiseFlag(0)
|
|
}
|
|
|
|
pub fn load(bits: u8) -> PushPromiseFlag {
|
|
PushPromiseFlag(bits & ALL)
|
|
}
|
|
|
|
pub fn is_end_headers(&self) -> bool {
|
|
self.0 & END_HEADERS == END_HEADERS
|
|
}
|
|
|
|
pub fn set_end_headers(&mut self) {
|
|
self.0 |= END_HEADERS;
|
|
}
|
|
|
|
pub fn is_padded(&self) -> bool {
|
|
self.0 & PADDED == PADDED
|
|
}
|
|
}
|
|
|
|
impl Default for PushPromiseFlag {
|
|
/// Returns a `PushPromiseFlag` value with `END_HEADERS` set.
|
|
fn default() -> Self {
|
|
PushPromiseFlag(END_HEADERS)
|
|
}
|
|
}
|
|
|
|
impl From<PushPromiseFlag> for u8 {
|
|
fn from(src: PushPromiseFlag) -> u8 {
|
|
src.0
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for PushPromiseFlag {
|
|
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
|
util::debug_flags(fmt, self.0)
|
|
.flag_if(self.is_end_headers(), "END_HEADERS")
|
|
.flag_if(self.is_padded(), "PADDED")
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
// ===== HeaderBlock =====
|
|
|
|
|
|
impl HeaderBlock {
|
|
fn load(&mut self, src: &mut BytesMut, max_header_list_size: usize, decoder: &mut hpack::Decoder) -> Result<(), Error> {
|
|
let mut reg = !self.fields.is_empty();
|
|
let mut malformed = false;
|
|
let mut headers_size = self.calculate_header_list_size();
|
|
|
|
macro_rules! set_pseudo {
|
|
($field:ident, $val:expr) => {{
|
|
if reg {
|
|
log::trace!("load_hpack; header malformed -- pseudo not at head of block");
|
|
malformed = true;
|
|
} else if self.pseudo.$field.is_some() {
|
|
log::trace!("load_hpack; header malformed -- repeated pseudo");
|
|
malformed = true;
|
|
} else {
|
|
let __val = $val;
|
|
headers_size += decoded_header_size(stringify!($ident).len() + 1, __val.as_str().len());
|
|
if headers_size < max_header_list_size {
|
|
self.pseudo.$field = Some(__val);
|
|
} else if !self.is_over_size {
|
|
log::trace!("load_hpack; header list size over max");
|
|
self.is_over_size = true;
|
|
}
|
|
}
|
|
}}
|
|
}
|
|
|
|
let mut cursor = Cursor::new(src);
|
|
|
|
// If the header frame is malformed, we still have to continue decoding
|
|
// the headers. A malformed header frame is a stream level error, but
|
|
// the hpack state is connection level. In order to maintain correct
|
|
// state for other streams, the hpack decoding process must complete.
|
|
let res = decoder.decode(&mut cursor, |header| {
|
|
use crate::hpack::Header::*;
|
|
|
|
match header {
|
|
Field {
|
|
name,
|
|
value,
|
|
} => {
|
|
// Connection level header fields are not supported and must
|
|
// result in a protocol error.
|
|
|
|
if name == header::CONNECTION
|
|
|| name == header::TRANSFER_ENCODING
|
|
|| name == header::UPGRADE
|
|
|| name == "keep-alive"
|
|
|| name == "proxy-connection"
|
|
{
|
|
log::trace!("load_hpack; connection level header");
|
|
malformed = true;
|
|
} else if name == header::TE && value != "trailers" {
|
|
log::trace!("load_hpack; TE header not set to trailers; val={:?}", value);
|
|
malformed = true;
|
|
} else {
|
|
reg = true;
|
|
|
|
headers_size += decoded_header_size(name.as_str().len(), value.len());
|
|
if headers_size < max_header_list_size {
|
|
self.fields.append(name, value);
|
|
} else if !self.is_over_size {
|
|
log::trace!("load_hpack; header list size over max");
|
|
self.is_over_size = true;
|
|
}
|
|
}
|
|
},
|
|
Authority(v) => set_pseudo!(authority, v),
|
|
Method(v) => set_pseudo!(method, v),
|
|
Scheme(v) => set_pseudo!(scheme, v),
|
|
Path(v) => set_pseudo!(path, v),
|
|
Status(v) => set_pseudo!(status, v),
|
|
}
|
|
});
|
|
|
|
if let Err(e) = res {
|
|
log::trace!("hpack decoding error; err={:?}", e);
|
|
return Err(e.into());
|
|
}
|
|
|
|
if malformed {
|
|
log::trace!("malformed message");
|
|
return Err(Error::MalformedMessage.into());
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn into_encoding(self) -> EncodingHeaderBlock {
|
|
EncodingHeaderBlock {
|
|
hpack: None,
|
|
headers: Iter {
|
|
pseudo: Some(self.pseudo),
|
|
fields: self.fields.into_iter(),
|
|
},
|
|
}
|
|
}
|
|
|
|
/// Calculates the size of the currently decoded header list.
|
|
///
|
|
/// According to http://httpwg.org/specs/rfc7540.html#SETTINGS_MAX_HEADER_LIST_SIZE
|
|
///
|
|
/// > The value is based on the uncompressed size of header fields,
|
|
/// > including the length of the name and value in octets plus an
|
|
/// > overhead of 32 octets for each header field.
|
|
fn calculate_header_list_size(&self) -> usize {
|
|
macro_rules! pseudo_size {
|
|
($name:ident) => ({
|
|
self.pseudo
|
|
.$name
|
|
.as_ref()
|
|
.map(|m| decoded_header_size(stringify!($name).len() + 1, m.as_str().len()))
|
|
.unwrap_or(0)
|
|
});
|
|
}
|
|
|
|
pseudo_size!(method) +
|
|
pseudo_size!(scheme) +
|
|
pseudo_size!(status) +
|
|
pseudo_size!(authority) +
|
|
pseudo_size!(path) +
|
|
self.fields.iter()
|
|
.map(|(name, value)| decoded_header_size(name.as_str().len(), value.len()))
|
|
.sum::<usize>()
|
|
}
|
|
|
|
/// Iterate over all pseudos and headers to see if any individual pair
|
|
/// would be too large to encode.
|
|
pub(crate) fn has_too_big_field(&self) -> bool {
|
|
macro_rules! pseudo_size {
|
|
($name:ident) => ({
|
|
self.pseudo
|
|
.$name
|
|
.as_ref()
|
|
.map(|m| decoded_header_size(stringify!($name).len() + 1, m.as_str().len()))
|
|
.unwrap_or(0)
|
|
});
|
|
}
|
|
|
|
if pseudo_size!(method) > MAX_HEADER_LENGTH {
|
|
return true;
|
|
}
|
|
|
|
if pseudo_size!(scheme) > MAX_HEADER_LENGTH {
|
|
return true;
|
|
}
|
|
|
|
if pseudo_size!(authority) > MAX_HEADER_LENGTH {
|
|
return true;
|
|
}
|
|
|
|
if pseudo_size!(path) > MAX_HEADER_LENGTH {
|
|
return true;
|
|
}
|
|
|
|
// skip :status, its never going to be too big
|
|
|
|
for (name, value) in &self.fields {
|
|
if decoded_header_size(name.as_str().len(), value.len()) > MAX_HEADER_LENGTH {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
false
|
|
}
|
|
}
|
|
|
|
fn decoded_header_size(name: usize, value: usize) -> usize {
|
|
name + value + 32
|
|
}
|
|
|
|
// Stupid hack to make the set_pseudo! macro happy, since all other values
|
|
// have a method `as_str` except for `String<Bytes>`.
|
|
trait AsStr {
|
|
fn as_str(&self) -> &str;
|
|
}
|
|
|
|
impl AsStr for String<Bytes> {
|
|
fn as_str(&self) -> &str {
|
|
self
|
|
}
|
|
}
|