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package webircgateway
import (
"fmt"
"log"
"net"
"net/http"
"runtime/debug"
"strings"
"sync"
"github.com/gorilla/websocket"
"github.com/igm/sockjs-go/v3/sockjs"
cmap "github.com/orcaman/concurrent-map"
)
type TransportKiwiirc struct {
gateway *Gateway
}
func (t *TransportKiwiirc) 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 },
}
handler := sockjs.NewHandler("/webirc/kiwiirc", sockjsOptions, t.sessionHandler)
t.gateway.HttpRouter.Handle("/webirc/kiwiirc/", handler)
}
func (t *TransportKiwiirc) makeChannel(chanID string, ws sockjs.Session) *TransportKiwiircChannel {
client := t.gateway.NewClient()
originHeader := strings.ToLower(ws.Request().Header.Get("Origin"))
if !t.gateway.IsClientOriginAllowed(originHeader) {
client.Log(2, "Origin %s not allowed. Closing connection", originHeader)
ws.Close(0, "Origin not allowed")
return nil
}
client.RemoteAddr = t.gateway.GetRemoteAddressFromRequest(ws.Request()).String()
clientHostnames, err := net.LookupAddr(client.RemoteAddr)
if err != nil || len(clientHostnames) == 0 {
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(ws.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(ws.Request().RemoteAddr)
client.Tags["remote-port"] = remoteAddrPort
client.Log(2, "New kiwiirc channel on %s from %s %s", ws.Request().Host, client.RemoteAddr, client.RemoteHostname)
client.Ready()
channel := &TransportKiwiircChannel{
Id: chanID,
Client: client,
Conn: ws,
waitForClose: make(chan bool),
Closed: false,
}
go channel.listenForSignals()
return channel
}
func (t *TransportKiwiirc) sessionHandler(session sockjs.Session) {
// Don't let a single users error kill the entire service for everyone
defer func() {
if r := recover(); r != nil {
log.Printf("[ERROR] Recovered from %s\n%s", r, debug.Stack())
}
}()
channels := cmap.New()
// Read from sockjs
go func() {
for {
msg, err := session.Recv()
if err == nil && len(msg) > 0 {
idEnd := strings.Index(msg, " ")
if idEnd == -1 {
// msg is in the form of ":chanId"
chanID := msg[1:]
c, channelExists := channels.Get(chanID)
if channelExists {
channel := c.(*TransportKiwiircChannel)
channel.close()
}
if !channelExists {
channel := t.makeChannel(chanID, session)
if channel == nil {
continue
}
channels.Set(chanID, channel)
// When the channel closes, remove it from the map again
go func() {
<-channel.waitForClose
channel.Client.Log(2, "Removing channel from connection")
channels.Remove(chanID)
}()
}
session.Send(":" + chanID)
} else {
// msg is in the form of ":chanId data"
chanID := msg[1:idEnd]
data := msg[idEnd+1:]
channel, channelExists := channels.Get(chanID)
if channelExists {
c := channel.(*TransportKiwiircChannel)
c.handleIncomingLine(data)
}
}
} else if err != nil {
t.gateway.Log(1, "kiwi connection closed (%s)", err.Error())
break
}
}
for channel := range channels.IterBuffered() {
c := channel.Val.(*TransportKiwiircChannel)
c.Closed = true
c.Client.StartShutdown("client_closed")
}
}()
}
type TransportKiwiircChannel struct {
Conn sockjs.Session
Client *Client
Id string
waitForClose chan bool
ClosedLock sync.Mutex
Closed bool
}
func (c *TransportKiwiircChannel) listenForSignals() {
for {
signal, ok := <-c.Client.Signals
if !ok {
break
}
c.Client.Log(1, "signal:%s %s", signal[0], signal[1])
if signal[0] == "state" {
if signal[1] == "connected" {
c.Conn.Send(fmt.Sprintf(":%s control connected", c.Id))
} else if signal[1] == "closed" {
c.Conn.Send(fmt.Sprintf(":%s control closed %s", c.Id, signal[2]))
}
}
if signal[0] == "data" {
toSend := strings.Trim(signal[1], "\r\n")
c.Conn.Send(fmt.Sprintf(":%s %s", c.Id, toSend))
}
}
c.ClosedLock.Lock()
c.Closed = true
close(c.Client.Recv)
close(c.waitForClose)
c.ClosedLock.Unlock()
}
func (c *TransportKiwiircChannel) handleIncomingLine(line string) {
c.ClosedLock.Lock()
if !c.Closed {
c.Client.Recv <- line
}
c.ClosedLock.Unlock()
}
func (c *TransportKiwiircChannel) close() {
if c.Client.upstream != nil {
c.Client.upstream.Close()
}
}
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