Add HTML branding overrides

3 files changed, 156 insertions, 1 deletions

diff --git a/src/main/java/org/traccar/web/CharResponseWrapper.java b/src/main/java/org/traccar/web/CharResponseWrapper.java
new file mode 100644
index 000000000..0e7976ce0
--- /dev/null
+++ b/src/main/java/org/traccar/web/CharResponseWrapper.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2023 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.web;
+
+import javax.servlet.ServletOutputStream;
+import javax.servlet.WriteListener;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpServletResponseWrapper;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class CharResponseWrapper extends HttpServletResponseWrapper {
+
+    private final ByteArrayOutputStream capture;
+    private ServletOutputStream output;
+
+    public CharResponseWrapper(HttpServletResponse response) {
+        super(response);
+        capture = new ByteArrayOutputStream(response.getBufferSize());
+    }
+
+    @Override
+    public ServletOutputStream getOutputStream() {
+        if (output == null) {
+            output = new ServletOutputStream() {
+                @Override
+                public boolean isReady() {
+                    return true;
+                }
+
+                @Override
+                public void setWriteListener(WriteListener writeListener) {
+                }
+
+                @Override
+                public void write(int b) {
+                    capture.write(b);
+                }
+
+                @Override
+                public void flush() throws IOException {
+                    capture.flush();
+                }
+
+                @Override
+                public void close() throws IOException {
+                    capture.close();
+                }
+            };
+        }
+        return output;
+    }
+
+    @Override
+    public void flushBuffer() throws IOException {
+        super.flushBuffer();
+        if (output != null) {
+            output.flush();
+        }
+    }
+
+    public String getCaptureAsString() throws IOException {
+        if (output != null) {
+            output.close();
+        }
+        return capture.toString(getCharacterEncoding());
+    }
+
+}
diff --git a/src/main/java/org/traccar/web/OverrideFilter.java b/src/main/java/org/traccar/web/OverrideFilter.java
new file mode 100644
index 000000000..cb69dfbfa
--- /dev/null
+++ b/src/main/java/org/traccar/web/OverrideFilter.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2023 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.web;
+
+import com.google.inject.Provider;
+import org.traccar.api.security.PermissionsService;
+import org.traccar.model.Server;
+import org.traccar.storage.StorageException;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@Singleton
+public class OverrideFilter implements Filter {
+
+    private final Provider<PermissionsService> permissionsServiceProvider;
+
+    @Inject
+    public OverrideFilter(Provider<PermissionsService> permissionsServiceProvider) {
+        this.permissionsServiceProvider = permissionsServiceProvider;
+    }
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+            throws IOException, ServletException {
+
+        CharResponseWrapper wrapper = new CharResponseWrapper((HttpServletResponse) response);
+
+        chain.doFilter(request, wrapper);
+
+        Server server;
+        try {
+            server = permissionsServiceProvider.get().getServer();
+        } catch (StorageException e) {
+            throw new RuntimeException(e);
+        }
+
+        String title = server.getString("serverTitle", "Traccar");
+        String description = server.getString("serverDescription", "Traccar GPS Tracking System");
+        String colorPrimary = server.getString("serverColorPrimary", "#1a237e");
+
+        String alteredContent = wrapper.getCaptureAsString()
+                .replace("${title}", title)
+                .replace("${description}", description)
+                .replace("${colorPrimary}", colorPrimary);
+
+        response.setContentLength(alteredContent.length());
+        response.getWriter().write(alteredContent);
+    }
+
+}
diff --git a/src/main/java/org/traccar/web/WebModule.java b/src/main/java/org/traccar/web/WebModule.java
index 0722c5d1e..f06abf0b5 100644
--- a/src/main/java/org/traccar/web/WebModule.java
+++ b/src/main/java/org/traccar/web/WebModule.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Anton Tananaev (anton@traccar.org)
+ * Copyright 2022 - 2023 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,8 @@ public class WebModule extends ServletModule {
 
     @Override
     protected void configureServlets() {
+        filter("/").through(OverrideFilter.class);
+        filter("/manifest.json").through(OverrideFilter.class);
         filter("/api/*").through(ThrottlingFilter.class);
         filter("/api/media/*").through(MediaFilter.class);
         serve("/api/socket").with(AsyncSocketServlet.class);