293 lines
7.5 KiB
Go
293 lines
7.5 KiB
Go
package genericlistener
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import (
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"bytes"
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"context"
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"crypto/tls"
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"encoding/hex"
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"log"
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"net"
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"time"
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jwt "github.com/dgrijalva/jwt-go"
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"github.com/gorilla/mux"
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"github.com/gorilla/websocket"
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"net/http"
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"bufio"
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"git.daplie.com/Daplie/go-rvpn-server/rvpn/connection"
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)
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type contextKey string
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const (
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ctxSecretKey contextKey = "secretKey"
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ctxConnectionTable contextKey = "connectionTable"
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ctxConfig contextKey = "config"
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)
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const (
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encryptNone int = iota
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encryptSSLV2
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encryptSSLV3
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encryptTLS10
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encryptTLS11
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encryptTLS12
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)
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//GenericListenAndServe -- used to lisen for any https traffic on 443 (8443)
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// - setup generic TCP listener, unencrypted TCP, with a Deadtime out
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// - leaverage the wedgeConn to peek into the buffer.
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// - if TLS, consume connection with TLS certbundle, pass to request identifier
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// - else, just pass to the request identififer
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func GenericListenAndServe(ctx context.Context, connectionTable *connection.Table, secretKey string, serverBinding string, certbundle tls.Certificate, deadTime int) {
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config := &tls.Config{Certificates: []tls.Certificate{certbundle}}
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ctx = context.WithValue(ctx, ctxSecretKey, secretKey)
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ctx = context.WithValue(ctx, ctxConnectionTable, connectionTable)
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ctx = context.WithValue(ctx, ctxConfig, config)
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listenAddr, err := net.ResolveTCPAddr("tcp", serverBinding)
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if nil != err {
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loginfo.Println(err)
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return
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}
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ln, err := net.ListenTCP("tcp", listenAddr)
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if err != nil {
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loginfo.Println("unable to bind", err)
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return
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}
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for {
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select {
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case <-ctx.Done():
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loginfo.Println("Cancel signal hit")
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return
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default:
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ln.SetDeadline(time.Now().Add(time.Duration(deadTime) * time.Second))
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conn, err := ln.Accept()
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loginfo.Println("Deadtime reached")
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if nil != err {
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if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
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continue
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}
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log.Println(err)
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return
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}
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wedgeConn := NewWedgeConn(conn)
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go handleConnection(ctx, wedgeConn)
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}
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}
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}
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//handleConnection -
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// - accept a wedgeConnection along with all the other required attritvues
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// - peek into the buffer, determine TLS or unencrypted
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// - if TSL, then terminate with a TLS endpoint, pass to handleStream
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// - if clearText, pass to handleStream
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func handleConnection(ctx context.Context, wConn *WedgeConn) {
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defer wConn.Close()
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peekCnt := 10
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encryptMode := encryptNone
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loginfo.Println("conn", wConn, wConn.LocalAddr().String(), wConn.RemoteAddr().String())
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peek, err := wConn.Peek(peekCnt)
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if err != nil {
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loginfo.Println("error while peeking")
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return
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}
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loginfo.Println(hex.Dump(peek[0:peekCnt]))
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loginfo.Println(hex.Dump(peek[2:4]))
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loginfo.Println("after peek")
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//take a look for a TLS header.
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if bytes.Contains(peek[0:0], []byte{0x80}) && bytes.Contains(peek[2:4], []byte{0x01, 0x03}) {
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encryptMode = encryptSSLV2
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} else if bytes.Contains(peek[0:3], []byte{0x16, 0x03, 0x00}) {
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encryptMode = encryptSSLV3
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} else if bytes.Contains(peek[0:3], []byte{0x16, 0x03, 0x01}) {
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encryptMode = encryptTLS10
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loginfo.Println("TLS10")
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} else if bytes.Contains(peek[0:3], []byte{0x16, 0x03, 0x02}) {
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encryptMode = encryptTLS11
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} else if bytes.Contains(peek[0:3], []byte{0x16, 0x03, 0x03}) {
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encryptMode = encryptTLS12
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}
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oneConn := &oneConnListener{wConn}
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config := ctx.Value(ctxConfig).(*tls.Config)
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if encryptMode == encryptSSLV2 {
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loginfo.Println("SSLv2 is not accepted")
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return
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} else if encryptMode != encryptNone {
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loginfo.Println("Handle Encryption")
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tlsListener := tls.NewListener(oneConn, config)
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conn, err := tlsListener.Accept()
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if err != nil {
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loginfo.Println(err)
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return
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}
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tlsWedgeConn := NewWedgeConn(conn)
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handleStream(ctx, tlsWedgeConn)
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return
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}
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loginfo.Println("Handle Unencrypted")
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handleStream(ctx, wConn)
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return
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}
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//handleStream --
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// - we have an unencrypted stream connection with the ability to peek
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// - attempt to identify HTTP
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// - handle http
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// - attempt to identify as WSS session
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// - attempt to identify as ADMIN/API session
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// - else handle as raw https
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// - handle other?
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func handleStream(ctx context.Context, wConn *WedgeConn) {
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loginfo.Println("handle Stream")
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loginfo.Println("conn", wConn, wConn.LocalAddr().String(), wConn.RemoteAddr().String())
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//peek for one byte to get the readers to converge
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//look at buffer
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//get the realrequest
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peek, err := wConn.Peek(1)
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loginfo.Println(hex.Dump(peek[0:]))
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peek, err = wConn.Peek(wConn.Buffered())
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loginfo.Println(hex.Dump(peek[0:]))
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if err != nil {
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loginfo.Println("error while peeking")
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loginfo.Println(hex.Dump(peek[0:]))
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return
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}
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// HTTP Identifcation
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if bytes.Contains(peek[:], []byte{0x0d, 0x0a}) {
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//string protocol
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if bytes.ContainsAny(peek[:], "HTTP/") {
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loginfo.Println("identifed HTTP")
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r, err := http.ReadRequest(bufio.NewReader(bytes.NewReader(peek)))
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if err != nil {
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loginfo.Println("identifed as HTTP, failed request", err)
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return
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}
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loginfo.Println(r)
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//now we have a request. Check to see if it is one of our own
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secretKey := ctx.Value(ctxSecretKey).(string)
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tokenString := r.URL.Query().Get("access_token")
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result, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
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return []byte(secretKey), nil
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})
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if err == nil && result.Valid {
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loginfo.Println("Valid WSS dected...sending to handler")
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oneConn := &oneConnListener{wConn}
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handleWssClient(ctx, oneConn)
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} else {
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loginfo.Println("not a valid WSS connection")
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}
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}
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}
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loginfo.Println(hex.Dump(peek[0:]))
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}
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//handleWssClient -
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// - expecting an existing oneConnListener with a qualified wss client connected.
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// - auth will happen again since we were just peeking at the token.
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func handleWssClient(ctx context.Context, oneConn *oneConnListener) {
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secretKey := ctx.Value(ctxSecretKey).(string)
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connectionTable := ctx.Value(ctxConnectionTable).(*connection.Table)
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router := mux.NewRouter().StrictSlash(true)
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router.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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loginfo.Println("HandleFunc /")
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switch url := r.URL.Path; url {
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case "/":
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loginfo.Println("websocket opening ", r.RemoteAddr, " ", r.Host)
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tokenString := r.URL.Query().Get("access_token")
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result, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
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return []byte(secretKey), nil
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})
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if err != nil || !result.Valid {
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w.WriteHeader(http.StatusForbidden)
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w.Write([]byte("Not Authorized"))
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loginfo.Println("access_token invalid...closing connection")
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return
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}
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loginfo.Println("help access_token valid")
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claims := result.Claims.(jwt.MapClaims)
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domains, ok := claims["domains"].([]interface{})
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var upgrader = websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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}
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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loginfo.Println("WebSocket upgrade failed", err)
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return
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}
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loginfo.Println("before connection table")
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//newConnection := connection.NewConnection(connectionTable, conn, r.RemoteAddr, domains)
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newRegistration := connection.NewRegistration(conn, r.RemoteAddr, domains)
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connectionTable.Register() <- newRegistration
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ok = <-newRegistration.CommCh()
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if !ok {
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loginfo.Println("connection registration failed ", newRegistration)
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return
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}
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loginfo.Println("connection registration accepted ", newRegistration)
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}
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})
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s := &http.Server{
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Addr: ":80",
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Handler: router,
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}
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err := s.Serve(oneConn)
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if err != nil {
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loginfo.Println("Serve error: ", err)
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}
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select {
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case <-ctx.Done():
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loginfo.Println("Cancel signal hit")
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return
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}
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}
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