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socket.go
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// Copyright 2020 H2O.ai, Inc.
//
// 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 wave
import (
"encoding/json"
"net/http"
"strings"
"time"
"github.com/gorilla/websocket"
)
// SocketServer represents a websocket server.
type SocketServer struct {
broker *Broker
auth *Auth
editable bool
baseURL string
forwardedHeaders map[string]bool
pingInterval time.Duration
reconnectTimeout time.Duration
upgrader websocket.Upgrader
}
func newSocketServer(broker *Broker, auth *Auth, conf ServerConf) *SocketServer {
var checkOrigin func(*http.Request) bool
if len(conf.AllowedOrigins) != 0 {
checkOrigin = func(r *http.Request) bool {
return conf.AllowedOrigins["*"] || conf.AllowedOrigins[r.Header.Get("Origin")]
}
}
upgrader := websocket.Upgrader{
ReadBufferSize: 1024, // TODO review
WriteBufferSize: 1024, // TODO review
CheckOrigin: checkOrigin,
}
return &SocketServer{broker, auth, conf.Editable, conf.BaseURL, conf.ForwardedHeaders, conf.PingInterval, conf.ReconnectTimeout, upgrader}
}
func (s *SocketServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
conn, err := s.upgrader.Upgrade(w, r, nil)
if err != nil {
echo(Log{"t": "socket_upgrade", "err": err.Error()})
return
}
session := anonymous
if s.auth != nil {
session = s.auth.identify(r)
if session == nil {
// As per websocket spec, clients are not required to follow HTTP redirects. So we send a redirect message.
if msg, err := json.Marshal(OpsD{U: s.baseURL + "_auth/logout"}); err == nil {
sw, err := conn.NextWriter(websocket.TextMessage)
if err != nil {
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
sw.Write(msg)
sw.Close()
}
return
}
}
header := make(http.Header)
if s.forwardedHeaders != nil {
for k, v := range r.Header {
if s.forwardedHeaders["*"] || s.forwardedHeaders[strings.ToLower(k)] {
header[k] = v
}
}
}
clientID := r.URL.Query().Get("client-id")
client := s.broker.getClient(clientID)
if client != nil {
client.lock.Lock()
// Close prev connection gracefully.
client.conn.WriteMessage(websocket.CloseMessage, []byte{})
client.conn.Close()
client.conn = conn
client.state = STATE_RECONNECT
client.addr = getRemoteAddr(r)
client.lock.Unlock()
echo(Log{"t": "client_reconnect", "client_id": client.id, "addr": client.addr})
} else {
client = newClient(getRemoteAddr(r), s.auth, session, s.broker, conn, s.editable, s.baseURL, &header, s.pingInterval, s.reconnectTimeout)
helloMsg, err := json.Marshal(OpsD{I: client.id})
if err != nil {
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
if !client.send(helloMsg) {
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
}
go client.flush()
go client.listen()
}
func getRemoteAddr(r *http.Request) string {
if addr := r.Header.Get("X-FORWARDED-FOR"); addr != "" { // forwarded via a proxy?
return addr
}
return r.RemoteAddr
}