107 lines
3.4 KiB
Go
107 lines
3.4 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package spdy
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"net/http"
|
|
"strings"
|
|
"sync/atomic"
|
|
|
|
"k8s.io/apimachinery/pkg/util/httpstream"
|
|
"k8s.io/apimachinery/pkg/util/runtime"
|
|
)
|
|
|
|
const HeaderSpdy31 = "SPDY/3.1"
|
|
|
|
// responseUpgrader knows how to upgrade HTTP responses. It
|
|
// implements the httpstream.ResponseUpgrader interface.
|
|
type responseUpgrader struct {
|
|
}
|
|
|
|
// connWrapper is used to wrap a hijacked connection and its bufio.Reader. All
|
|
// calls will be handled directly by the underlying net.Conn with the exception
|
|
// of Read and Close calls, which will consider data in the bufio.Reader. This
|
|
// ensures that data already inside the used bufio.Reader instance is also
|
|
// read.
|
|
type connWrapper struct {
|
|
net.Conn
|
|
closed int32
|
|
bufReader *bufio.Reader
|
|
}
|
|
|
|
func (w *connWrapper) Read(b []byte) (n int, err error) {
|
|
if atomic.LoadInt32(&w.closed) == 1 {
|
|
return 0, io.EOF
|
|
}
|
|
return w.bufReader.Read(b)
|
|
}
|
|
|
|
func (w *connWrapper) Close() error {
|
|
err := w.Conn.Close()
|
|
atomic.StoreInt32(&w.closed, 1)
|
|
return err
|
|
}
|
|
|
|
// NewResponseUpgrader returns a new httpstream.ResponseUpgrader that is
|
|
// capable of upgrading HTTP responses using SPDY/3.1 via the
|
|
// spdystream package.
|
|
func NewResponseUpgrader() httpstream.ResponseUpgrader {
|
|
return responseUpgrader{}
|
|
}
|
|
|
|
// UpgradeResponse upgrades an HTTP response to one that supports multiplexed
|
|
// streams. newStreamHandler will be called synchronously whenever the
|
|
// other end of the upgraded connection creates a new stream.
|
|
func (u responseUpgrader) UpgradeResponse(w http.ResponseWriter, req *http.Request, newStreamHandler httpstream.NewStreamHandler) httpstream.Connection {
|
|
connectionHeader := strings.ToLower(req.Header.Get(httpstream.HeaderConnection))
|
|
upgradeHeader := strings.ToLower(req.Header.Get(httpstream.HeaderUpgrade))
|
|
if !strings.Contains(connectionHeader, strings.ToLower(httpstream.HeaderUpgrade)) || !strings.Contains(upgradeHeader, strings.ToLower(HeaderSpdy31)) {
|
|
w.WriteHeader(http.StatusBadRequest)
|
|
fmt.Fprintf(w, "unable to upgrade: missing upgrade headers in request: %#v", req.Header)
|
|
return nil
|
|
}
|
|
|
|
hijacker, ok := w.(http.Hijacker)
|
|
if !ok {
|
|
w.WriteHeader(http.StatusInternalServerError)
|
|
fmt.Fprintf(w, "unable to upgrade: unable to hijack response")
|
|
return nil
|
|
}
|
|
|
|
w.Header().Add(httpstream.HeaderConnection, httpstream.HeaderUpgrade)
|
|
w.Header().Add(httpstream.HeaderUpgrade, HeaderSpdy31)
|
|
w.WriteHeader(http.StatusSwitchingProtocols)
|
|
|
|
conn, bufrw, err := hijacker.Hijack()
|
|
if err != nil {
|
|
runtime.HandleError(fmt.Errorf("unable to upgrade: error hijacking response: %v", err))
|
|
return nil
|
|
}
|
|
|
|
connWithBuf := &connWrapper{Conn: conn, bufReader: bufrw.Reader}
|
|
spdyConn, err := NewServerConnection(connWithBuf, newStreamHandler)
|
|
if err != nil {
|
|
runtime.HandleError(fmt.Errorf("unable to upgrade: error creating SPDY server connection: %v", err))
|
|
return nil
|
|
}
|
|
|
|
return spdyConn
|
|
}
|