/
server.go
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/
server.go
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/*
Copyright 2021 The KodeRover 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 remotedialer
import (
"crypto/tls"
"crypto/x509"
"encoding/base64"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/koderover/zadig/v2/pkg/tool/log"
"github.com/pkg/errors"
)
var (
errFailedAuth = errors.New("failed authentication")
errWrongMessageType = errors.New("wrong websocket message type")
)
type Authorizer func(req *http.Request) (clientKey string, authed bool, err error)
type ErrorWriter func(rw http.ResponseWriter, req *http.Request, code int, err error)
func DefaultErrorWriter(rw http.ResponseWriter, req *http.Request, code int, err error) {
rw.WriteHeader(code)
_, errWrite := rw.Write([]byte(err.Error()))
if errWrite != nil {
log.Warnf("Failed to write error: %s", errWrite)
}
}
type Server struct {
PeerID string
PeerToken string
ClientConnectAuthorizer ConnectAuthorizer
authorizer Authorizer
errorWriter ErrorWriter
sessions *sessionManager
peers map[string]peer
peerLock sync.Mutex
caCert string
httpTransport *http.Transport
sync.Mutex
}
func New(auth Authorizer, errorWriter ErrorWriter) *Server {
return &Server{
peers: map[string]peer{},
authorizer: auth,
errorWriter: errorWriter,
sessions: newSessionManager(),
}
}
func (s *Server) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
clientKey, authed, peer, err := s.auth(req)
if err != nil {
s.errorWriter(rw, req, 400, err)
return
}
if !authed {
s.errorWriter(rw, req, 401, errFailedAuth)
return
}
log.Infof("Handling backend connection request [%s]", clientKey)
upgrader := websocket.Upgrader{
HandshakeTimeout: 5 * time.Second,
CheckOrigin: func(r *http.Request) bool { return true },
Error: s.errorWriter,
}
wsConn, err := upgrader.Upgrade(rw, req, nil)
if err != nil {
s.errorWriter(rw, req, 400, errors.Wrapf(err, "Error during upgrade for host [%v]", clientKey))
return
}
session := s.sessions.add(clientKey, wsConn, peer)
session.auth = s.ClientConnectAuthorizer
defer s.sessions.remove(session)
code, err := session.Serve(req.Context())
if err != nil {
// Hijacked so we can't write to the client
log.Infof("error in remotedialer server [%d]: %v", code, err)
}
}
func (s *Server) auth(req *http.Request) (clientKey string, authed, peer bool, err error) {
id := req.Header.Get(ID)
token := req.Header.Get(Token)
if id != "" && token != "" {
// peer authentication
s.peerLock.Lock()
p, ok := s.peers[id]
s.peerLock.Unlock()
if ok && p.token == token {
return id, true, true, nil
}
}
id, authed, err = s.authorizer(req)
return id, authed, false, err
}
func (r *Server) GetTransport(clusterCaCert string, clientKey string) (http.RoundTripper, error) {
r.Lock()
defer r.Unlock()
transport := &http.Transport{}
if clusterCaCert != "" {
certBytes, err := base64.StdEncoding.DecodeString(clusterCaCert)
if err != nil {
return nil, err
}
certs := x509.NewCertPool()
certs.AppendCertsFromPEM(certBytes)
transport.TLSClientConfig = &tls.Config{
RootCAs: certs,
}
}
d := r.Dialer(clientKey)
transport.DialContext = d
transport.Proxy = http.ProxyFromEnvironment
transport.IdleConnTimeout = 30 * time.Second
r.caCert = clusterCaCert
if r.httpTransport != nil {
r.httpTransport.CloseIdleConnections()
}
r.httpTransport = transport
return transport, nil
}
func (s *Server) Disconnect(clientKey string) {
for _, session := range s.sessions.clients[clientKey] {
session.CloseImmediately()
}
}