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package webircgateway
import (
"net"
"net/http"
"strings"
"github.com/gorilla/websocket"
"github.com/igm/sockjs-go/v3/sockjs"
)
type TransportSockjs struct {
gateway *Gateway
}
func (t *TransportSockjs) Init(g *Gateway) {
t.gateway = g
sockjsOptions := sockjs.DefaultOptions
sockjsOptions.WebsocketUpgrader = &websocket.Upgrader{
// Origin is checked within the session handler
CheckOrigin: func(_ *http.Request) bool { return true },
}
sockjsHandler := sockjs.NewHandler("/webirc/sockjs", sockjsOptions, t.sessionHandler)
t.gateway.HttpRouter.Handle("/webirc/sockjs/", sockjsHandler)
}
func (t *TransportSockjs) sessionHandler(session sockjs.Session) {
client := t.gateway.NewClient()
originHeader := strings.ToLower(session.Request().Header.Get("Origin"))
if !t.gateway.IsClientOriginAllowed(originHeader) {
client.Log(2, "Origin %s not allowed. Closing connection", originHeader)
session.Close(0, "Origin not allowed")
return
}
client.RemoteAddr = t.gateway.GetRemoteAddressFromRequest(session.Request()).String()
clientHostnames, err := net.LookupAddr(client.RemoteAddr)
if err != nil {
client.RemoteHostname = client.RemoteAddr
} else {
// FQDNs include a . at the end. Strip it out
potentialHostname := strings.Trim(clientHostnames[0], ".")
// Must check that the resolved hostname also resolves back to the users IP
addr, err := net.LookupIP(potentialHostname)
if err == nil && len(addr) == 1 && addr[0].String() == client.RemoteAddr {
client.RemoteHostname = potentialHostname
} else {
client.RemoteHostname = client.RemoteAddr
}
}
if t.gateway.isRequestSecure(session.Request()) {
client.Tags["secure"] = ""
}
// This doesn't make sense to have since the remote port may change between requests. Only
// here for testing purposes for now.
_, remoteAddrPort, _ := net.SplitHostPort(session.Request().RemoteAddr)
client.Tags["remote-port"] = remoteAddrPort
client.Log(2, "New sockjs client on %s from %s %s", session.Request().Host, client.RemoteAddr, client.RemoteHostname)
client.Ready()
// Read from sockjs
go func() {
for {
msg, err := session.Recv()
if err == nil && len(msg) > 0 {
client.Log(1, "client->: %s", msg)
select {
case client.Recv <- msg:
default:
client.Log(3, "Recv queue full. Dropping data")
// TODO: Should this really just drop the data or close the connection?
}
} else if err != nil {
client.Log(1, "sockjs connection closed (%s)", err.Error())
break
} else if len(msg) == 0 {
client.Log(1, "Got 0 bytes from websocket")
}
}
close(client.Recv)
}()
// Process signals for the client
for {
signal, ok := <-client.Signals
if !ok {
break
}
if signal[0] == "data" {
line := strings.Trim(signal[1], "\r\n")
client.Log(1, "->ws: %s", line)
session.Send(line)
}
if signal[0] == "state" && signal[1] == "closed" {
session.Close(0, "Closed")
}
}
}
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