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message.go
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message.go
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package minhq
import (
"bytes"
"errors"
"io"
"net/url"
"strconv"
"strings"
"github.com/martinthomson/minhq/hc"
bitio "github.com/martinthomson/minhq/io"
)
func buildRequestHeaderFields(method string, base *url.URL, target string, headers []hc.HeaderField) (*url.URL, []hc.HeaderField, error) {
var u *url.URL
var err error
if base != nil {
u, err = base.Parse(target)
} else {
u, err = url.Parse(target)
}
if err != nil {
return nil, nil, err
}
if u.Scheme != "https" {
return nil, nil, errors.New("No support for non-https URLs")
}
return u, append([]hc.HeaderField{
hc.HeaderField{Name: ":authority", Value: u.Host},
hc.HeaderField{Name: ":path", Value: u.EscapedPath()},
hc.HeaderField{Name: ":method", Value: method},
hc.HeaderField{Name: ":scheme", Value: u.Scheme},
}, headers...), nil
}
type headerFieldArray []hc.HeaderField
func (a headerFieldArray) String() string {
w := 0
for _, h := range a {
if len(h.Name) > w {
w = len(h.Name)
}
}
s := ""
for _, h := range a {
s += h.String() + "\n"
}
return s
}
// GetHeader performs a case-insensitive lookup for a given name.
// This returns an empty string if the header field wasn't present.
// Multiple values are concatenated using commas.
func (a headerFieldArray) GetHeader(n string) string {
v := ""
for _, h := range a {
// Incoming messages have all lowercase names.
if h.Name == strings.ToLower(n) {
if len(v) > 0 {
v += "," + h.Value
} else {
v = h.Value
}
}
}
return v
}
// GetStatus returns the status from the header block, or 0 if it's not there or badly formed.
func (a headerFieldArray) GetStatus() int {
status, err := strconv.Atoi(a.GetHeader(":status"))
if err != nil {
return 0
}
return status
}
func (a headerFieldArray) getMethodAndTarget() (string, *url.URL, error) {
method := a.GetHeader(":method")
if method == "" {
return "", nil, errors.New("Missing :method from request")
}
u := url.URL{
Scheme: a.GetHeader(":scheme"),
Host: a.GetHeader(":authority"),
}
if u.Scheme == "" {
return "", nil, errors.New("Missing :scheme from request")
}
if u.Host == "" {
u.Host = a.GetHeader("Host")
}
if u.Host == "" {
return "", nil, errors.New("Missing :authority/Host from request")
}
p := a.GetHeader(":path")
if p == "" {
return "", nil, errors.New("Missing :path from request")
}
// Let url.Parse() handle all the nasty corner cases in path syntax.
withPath, err := u.Parse(p)
if err != nil {
return "", nil, err
}
return method, withPath, nil
}
// initialHeadersHandler takes a header block and returns true if this is a
// non-1xx block (which is always true for a request).
type initialHeadersHandler func(headers headerFieldArray) (bool, error)
type incomingMessageFrameHandler func(FrameType, io.Reader) error
// IncomingMessage is the common parts of inbound messages (requests for
// servers, responses for clients).
type IncomingMessage struct {
s *recvStream
decoder *hc.QpackDecoder
Headers headerFieldArray
reader *bitio.ConcatenatingReader
Trailers <-chan []hc.HeaderField
trailers chan<- []hc.HeaderField
}
func newIncomingMessage(s *recvStream, decoder *hc.QpackDecoder, headers []hc.HeaderField) IncomingMessage {
trailers := make(chan []hc.HeaderField)
return IncomingMessage{
s: s,
decoder: decoder,
Headers: headers,
reader: bitio.NewConcatenatingReader(),
Trailers: trailers,
trailers: trailers,
}
}
// Read means that this implements io.Reader.
func (msg *IncomingMessage) Read(p []byte) (int, error) {
return msg.reader.Read(p)
}
func (msg *IncomingMessage) handleMessage(headersHandler initialHeadersHandler,
frameHandler incomingMessageFrameHandler) error {
defer close(msg.trailers)
defer msg.reader.Close()
err := func() error {
gotFirstHeaders := false
afterTrailers := false
for {
t, r, err := msg.s.ReadFrame()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
if afterTrailers {
return ErrInvalidFrame
}
switch t {
case frameData:
if !gotFirstHeaders {
return ErrInvalidFrame
}
msg.reader.AddReader(r)
case frameHeaders:
headers, err := msg.decoder.ReadHeaderBlock(r, msg.s.Id())
if err != nil {
return err
}
err = hc.ValidatePseudoHeaders(headers)
if err != nil {
return err
}
if gotFirstHeaders {
msg.trailers <- headers
afterTrailers = true
} else {
gotFirstHeaders, err = headersHandler(headers)
if err != nil {
return err
}
}
default:
err := frameHandler(t, r)
if err != nil {
return err
}
}
}
}()
if err != nil {
msg.decoder.Cancelled(msg.s.Id())
}
return err
}
// GetHeader performs a case-insensitive lookup for a given name.
// This returns an empty string if the header field wasn't present.
// Multiple values are concatenated using commas.
func (msg *IncomingMessage) GetHeader(n string) string {
return msg.Headers.GetHeader(n)
}
// String just formats headers.
func (msg *IncomingMessage) String() string {
return msg.Headers.String()
}
// OutgoingMessage contains the common parts of outgoing messages (requests for
// clients, responses for servers).
type OutgoingMessage struct {
headers headerFieldArray
s *sendStream
// encoder is needed for encoding trailers (ugh)
encoder *hc.QpackEncoder
}
var _ io.WriteCloser = &OutgoingMessage{}
func newOutgoingMessage(c *connection, s *sendStream, headers []hc.HeaderField) OutgoingMessage {
return OutgoingMessage{
headers: headers,
s: s,
encoder: c.encoder,
}
}
// Headers returns the header fields on this message.
func (msg *OutgoingMessage) Headers() []hc.HeaderField {
return msg.headers[:]
}
// Write fulfils the io.Writer contract.
func (msg *OutgoingMessage) Write(p []byte) (int, error) {
// Note that WriteFrame always uses the entire input array, and it reports
// how much it wrote, not how much it used. It always uses the entire
// input array. That's not the io.Writer contract, so adapt.
_, err := msg.s.WriteFrame(frameData, p)
if err != nil {
return 0, err
}
return len(p), nil
}
func (msg *OutgoingMessage) writeHeaderBlock(headers []hc.HeaderField) error {
// TODO: ensure that header blocks are properly dropped if the stream is reset.
var headerBuf bytes.Buffer
err := msg.encoder.WriteHeaderBlock(&headerBuf, msg.s.Id(), headers...)
if err != nil {
return err
}
_, err = msg.s.WriteFrame(frameHeaders, headerBuf.Bytes())
return err
}
// End closes out the stream, writing any trailers that might be included.
func (msg *OutgoingMessage) End(trailers []hc.HeaderField) error {
if trailers != nil {
err := msg.writeHeaderBlock(trailers)
if err != nil {
return err
}
}
return msg.Close()
}
// Close allows OutgoingMessage to implement io.WriteCloser.
func (msg *OutgoingMessage) Close() error {
return msg.s.Close()
}
// String just formats headers.
func (msg *OutgoingMessage) String() string {
return msg.headers.String()
}