From 642f04c955e5a608aced50fb012fd8d6b0df9f19 Mon Sep 17 00:00:00 2001
From: Jimmy <19169592+jimtheyounger@users.noreply.github.com>
Date: Mon, 27 Sep 2021 12:03:54 +0200
Subject: [PATCH] fix (plugin): fix finding local ip for onlyoffice (#409)

---
 server/plugin/plg_editor_onlyoffice/index.go | 23 +++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/server/plugin/plg_editor_onlyoffice/index.go b/server/plugin/plg_editor_onlyoffice/index.go
index b173d245..fa84168e 100644
--- a/server/plugin/plg_editor_onlyoffice/index.go
+++ b/server/plugin/plg_editor_onlyoffice/index.go
@@ -227,15 +227,32 @@ func IframeContentHandler(ctx App, res http.ResponseWriter, req *http.Request) {
 		if err != nil {
 			return ""
 		}
+
+        maybeips := []string{}
 		for _, address := range addrs {
 			if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
 				if ipnet.IP.To4() != nil {
-					return ipnet.IP.String()
+                    maybeips = append(maybeips, ipnet.IP.String())
 				}
 			}
 		}
-		return ""
-	}()
+
+        // if there is just one interface, we can just pick that one
+        if len(maybeips) == 1 {
+            return maybeips[0]
+        }
+
+        // if not, fallback to capturing our outgoing local ip
+        conn, err := net.Dial("udp", "8.8.8.8:80")
+        if err != nil {
+            return ""
+        }
+        defer conn.Close()
+
+        localAddr := conn.LocalAddr().(*net.UDPAddr)
+
+        return localAddr.IP.String()
+ 	}()
 	filestashServerLocation = fmt.Sprintf("http://%s:%d", localip, Config.Get("general.port").Int())
 	contentType = func(p string) string {
 		var (