From 39b293b9f66c3c539e180fb2bcf37849335100dc Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Thu, 18 May 2023 16:16:10 -0700
Subject: Fix override filter

---
 src/main/java/org/traccar/web/OverrideFilter.java  | 40 ++++++++++++----------
 src/main/java/org/traccar/web/ResponseWrapper.java |  3 +-
 2 files changed, 23 insertions(+), 20 deletions(-)

diff --git a/src/main/java/org/traccar/web/OverrideFilter.java b/src/main/java/org/traccar/web/OverrideFilter.java
index e6e02514c..70eb80a67 100644
--- a/src/main/java/org/traccar/web/OverrideFilter.java
+++ b/src/main/java/org/traccar/web/OverrideFilter.java
@@ -50,30 +50,32 @@ public class OverrideFilter implements Filter {
         chain.doFilter(request, wrappedResponse);
 
         byte[] bytes = wrappedResponse.getCapture();
-        if (wrappedResponse.getContentType() != null && wrappedResponse.getContentType().contains("text/html")
-                || ((HttpServletRequest) request).getPathInfo().endsWith("manifest.json")) {
+        if (bytes != null) {
+            if (wrappedResponse.getContentType() != null && wrappedResponse.getContentType().contains("text/html")
+                    || ((HttpServletRequest) request).getPathInfo().endsWith("manifest.json")) {
 
-            Server server;
-            try {
-                server = permissionsServiceProvider.get().getServer();
-            } catch (StorageException e) {
-                throw new RuntimeException(e);
-            }
+                Server server;
+                try {
+                    server = permissionsServiceProvider.get().getServer();
+                } catch (StorageException e) {
+                    throw new RuntimeException(e);
+                }
 
-            String title = server.getString("title", "Traccar");
-            String description = server.getString("description", "Traccar GPS Tracking System");
-            String colorPrimary = server.getString("colorPrimary", "#1a237e");
+                String title = server.getString("title", "Traccar");
+                String description = server.getString("description", "Traccar GPS Tracking System");
+                String colorPrimary = server.getString("colorPrimary", "#1a237e");
 
-            String alteredContent = new String(wrappedResponse.getCapture())
-                    .replace("${title}", title)
-                    .replace("${description}", description)
-                    .replace("${colorPrimary}", colorPrimary);
+                String alteredContent = new String(wrappedResponse.getCapture())
+                        .replace("${title}", title)
+                        .replace("${description}", description)
+                        .replace("${colorPrimary}", colorPrimary);
 
-            response.setContentLength(alteredContent.length());
-            response.getOutputStream().write(alteredContent.getBytes());
+                response.setContentLength(alteredContent.length());
+                response.getOutputStream().write(alteredContent.getBytes());
 
-        } else {
-            response.getOutputStream().write(bytes);
+            } else {
+                response.getOutputStream().write(bytes);
+            }
         }
     }
 
diff --git a/src/main/java/org/traccar/web/ResponseWrapper.java b/src/main/java/org/traccar/web/ResponseWrapper.java
index 7c06b67b8..c6179a33e 100644
--- a/src/main/java/org/traccar/web/ResponseWrapper.java
+++ b/src/main/java/org/traccar/web/ResponseWrapper.java
@@ -75,8 +75,9 @@ public class ResponseWrapper extends HttpServletResponseWrapper {
     public byte[] getCapture() throws IOException {
         if (output != null) {
             output.close();
+            return capture.toByteArray();
         }
-        return capture.toByteArray();
+        return null;
     }
 
 }
-- 
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