Add support for 'http-reponse-headers' attribute to add custom response headers

src/main/java/org/dynmap/DynmapPlugin.java

@@ -303,6 +303,19 @@ public class DynmapPlugin extends JavaPlugin {
         boolean checkbannedips = configuration.getBoolean("check-banned-ips", true);
         int maxconnections = configuration.getInteger("max-sessions", 30);
         if(maxconnections < 2) maxconnections = 2;
+        /* Load customized response headers, if any */
+        ConfigurationNode custhttp = configuration.getNode("http-response-headers");
+        HashMap<String, String> custhdrs = new HashMap<String,String>();
+        if(custhttp != null) {
+            for(String k : custhttp.keySet()) {
+                String v = custhttp.getString(k);
+                if(v != null) {
+                    custhdrs.put(k, v);
+                }
+            }
+        }
+        HttpServer.setCustomHeaders(custhdrs);
+        
         if(allow_symlinks)
         	Log.verboseinfo("Web server is permitting symbolic links");
         else

src/main/java/org/dynmap/web/HttpServer.java

@@ -10,8 +10,10 @@ import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.SocketAddress;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.IdentityHashMap;
+import java.util.Map;
 import java.util.SortedMap;
 import java.util.TreeMap;
 import java.util.logging.Logger;
@@ -34,6 +36,7 @@ public class HttpServer extends Thread {
     private Object lock = new Object();
     private HashSet<HttpServerConnection> active_connections = new HashSet<HttpServerConnection>();
     private HashSet<HttpServerConnection> keepalive_connections = new HashSet<HttpServerConnection>();
+    private static Map<String, String> headers = new HashMap<String,String>();
 
     public HttpServer(InetAddress bindAddress, int port, boolean check_banned_ips, int max_sessions) {
         this.bindAddress = bindAddress;
@@ -189,4 +192,10 @@ public class HttpServer extends Thread {
     	}
     	return false;
     }
+    public static Map<String,String> getCustomHeaders() {
+        return headers;
+    }
+    public static void setCustomHeaders(Map<String,String> hdrs) {
+        headers = hdrs;
+    }
 }

src/main/java/org/dynmap/web/HttpServerConnection.java

@@ -111,6 +111,12 @@ public class HttpServerConnection extends Thread {
             out.append(field.getValue());
             out.append("\r\n");
         }
+        for(Entry<String, String> custom : HttpServer.getCustomHeaders().entrySet()) {
+            out.append(custom.getKey());
+            out.append(": ");
+            out.append(custom.getValue());
+            out.append("\r\n");
+        }
         out.append("\r\n");
         out.flush();
     }

src/main/resources/configuration.txt

@@ -263,6 +263,11 @@ showplayerfacesinmenu: true
 # Set sidebaropened: 'true' to pin menu sidebar opened permanently, 'pinned' to default the sidebar to pinned, but allow it to unpin
 #sidebaropened: true
 
+# Customized HTTP response headers - add 'id: value' pairs to all HTTP response headers (internal web server only)
+#http-response-headers:
+#    Access-Control-Allow-Origin: "my-domain.com"
+#    X-Custom-Header-Of-Mine: "MyHeaderValue"
+
 joinmessage: "%playername% joined"
 quitmessage: "%playername% quit"
 spammessage: "You may only chat once every %interval% seconds."