IP resolver: add v6 support

controller/ip.go

@@ -10,14 +10,18 @@ import (
 // Returns the request's original IP address, resolving the `x-forwarded-for`
 // header if the request originates from a trusted proxy.
 func ResolveIP(app *model.AppState, r *http.Request) string {
-    addr := strings.Split(r.RemoteAddr, ":")[0]
+    iSplit := strings.LastIndex(r.RemoteAddr, ":")
+    addr := r.RemoteAddr[0:iSplit]
     if slices.Contains(app.Config.TrustedProxies, addr) {
         forwardedFor := r.Header.Get("x-forwarded-for")
         if len(forwardedFor) > 0 {
             // discard extra IPs; cloudflare tends to append their nodes
             forwardedFor = strings.Split(forwardedFor, ", ")[0]
-            return forwardedFor
+            addr = forwardedFor
         }
     }
+    if addr[0] == '[' && addr[len(addr) - 1] == ']' {
+        addr = addr[1:len(addr) - 1]
+    }
     return addr
 }