From 449693d375e340bf2e0e326d873b1d8107547066 Mon Sep 17 00:00:00 2001
From: Roland Osborne <roland.osborne@gmail.com>
Date: Fri, 7 Apr 2023 11:42:17 -0700
Subject: [PATCH] integrating stun/turn for webrtc

---
 net/server/internal/api_addCall.go |  5 ++
 net/server/internal/sturn/sturn.go | 75 ++++++++++++++++++++++++++++++
 net/server/main.go                 |  5 ++
 3 files changed, 85 insertions(+)
 create mode 100644 net/server/internal/sturn/sturn.go

diff --git a/net/server/internal/api_addCall.go b/net/server/internal/api_addCall.go
index db660690..26026f9b 100644
--- a/net/server/internal/api_addCall.go
+++ b/net/server/internal/api_addCall.go
@@ -51,6 +51,11 @@ func AddCall(w http.ResponseWriter, r *http.Request) {
     ErrResponse(w, http.StatusInternalServerError, calleeErr)
     return
   }
+  //turnBin, turnErr := securerandom.Bytes(APPTokenSize)
+  //if turnErr != nil {
+  //  ErrResponse(w, http.StatusInternalServerError, turnErr)
+  //  return
+  //}
   callId := uuid.New().String()
 
   // allocate bridge
diff --git a/net/server/internal/sturn/sturn.go b/net/server/internal/sturn/sturn.go
new file mode 100644
index 00000000..12c2ac0d
--- /dev/null
+++ b/net/server/internal/sturn/sturn.go
@@ -0,0 +1,75 @@
+package databag
+
+import (
+//  "encoding/json"
+  "sync"
+//  "time"
+  "fmt"
+  "net"
+)
+
+var sturn *Sturn
+const SturnKeepAlive = 15
+
+type SturnSession struct {
+}
+
+type Sturn struct {
+  sync sync.Mutex
+  sessions []*SturnSession
+  port uint
+  relayStart uint
+  relayEnd uint
+  conn *net.PacketConn
+  closed chan bool
+}
+
+func Listen(port uint, relayStart uint, relayEnd uint) (error) {
+
+  if (sturn != nil) {
+    (*sturn.conn).Close()
+    <-sturn.closed
+    sturn = nil
+  }
+
+  address := fmt.Sprintf(":%d", port)
+	conn, err := net.ListenPacket("udp", address)
+	if err != nil {
+    return err
+	}
+
+  fmt.Println("STARTED STURN SERVER")
+
+  sturn := &Sturn{
+    port: port,
+    relayStart: relayStart,
+    relayEnd: relayEnd,
+    conn: &conn,
+  }
+
+  go sturn.serve(conn);
+  return nil
+}
+
+func Close() {
+  if (sturn != nil) {
+    (*sturn.conn).Close()
+    <-sturn.closed
+    sturn = nil
+  }
+}
+
+func (s *Sturn) serve(conn net.PacketConn) {
+  for {
+    buf := make([]byte, 1024)
+    n, addr, err := conn.ReadFrom(buf)
+		if err != nil {
+      fmt.Println(err)
+      return
+		}
+
+    fmt.Println("GOT STURN MESSAGE: ", n, addr);
+  }
+  s.closed <- true
+}
+
diff --git a/net/server/main.go b/net/server/main.go
index e914f69b..ee26fbeb 100644
--- a/net/server/main.go
+++ b/net/server/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	app "databag/internal"
 	"databag/internal/store"
+  sturn "databag/internal/sturn"
 	"github.com/gorilla/handlers"
 	"log"
 	"net/http"
@@ -18,6 +19,8 @@ func main() {
 	origins := handlers.AllowedOrigins([]string{"*"})
 	methods := handlers.AllowedMethods([]string{"GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS"})
 
+  sturn.Listen(5001, 5002, 5101)
+
   args := os.Args
   if len(args) == 3 {
     port := ":" + args[2]
@@ -32,4 +35,6 @@ func main() {
     log.Printf("starting server");
     log.Fatal(http.ListenAndServe(":7000", handlers.CORS(origins, methods)(router)))
   }
+
+  sturn.Close();
 }