provide IceServerList flag as variadic arg to webrtc Configuration (#24)

client/snowflake.go

@@ -63,8 +63,7 @@ func dialWebRTC() (*webRTCConn, error) {
 
 	// TODO: [#3] Fetch ICE server information from Broker.
 	// TODO: [#18] Consider TURN servers here too.
-	config := webrtc.NewConfiguration(
-		webrtc.OptionIceServer("stun:stun.l.google.com:19302"))
+	config := webrtc.NewConfiguration(iceServers...)
 
 	broker := NewBrokerChannel(brokerURL, frontDomain)
 	if nil == broker {

client/torrc

@@ -3,6 +3,7 @@ DataDirectory datadir
 
 ClientTransportPlugin snowflake exec ./client \
 -url https://snowflake-reg.appspot.com/ \
--front www.google.com
+-front www.google.com \
+-ice stun:stun.l.google.com:19302
 
 Bridge snowflake 0.0.3.0:1

client/util.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"github.com/keroserene/go-webrtc"
 	"log"
 	"strings"
 	"time"
@@ -11,7 +12,7 @@ const (
 	LogTimeInterval = 5
 )
 
-type IceServerList []string
+type IceServerList []webrtc.ConfigurationOption
 
 func (i *IceServerList) String() string {
 	return fmt.Sprint(*i)
@@ -20,7 +21,8 @@ func (i *IceServerList) String() string {
 func (i *IceServerList) Set(s string) error {
 	for _, server := range strings.Split(s, ",") {
 		// TODO: STUN / TURN url format validation?
-		*i = append(*i, server)
+		option := webrtc.OptionIceServer(server)
+		*i = append(*i, option)
 	}
 	return nil
 }