Add text filter for inserts.

diff --git a/src/main/java/net/pterodactylus/sone/text/TextFilter.java b/src/main/java/net/pterodactylus/sone/text/TextFilter.java
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+++ b/src/main/java/net/pterodactylus/sone/text/TextFilter.java
@@ -0,0 +1,65 @@
+/*
+ * Sone - TextFilter.java - Copyright © 2011 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.text;
+
+import java.util.logging.Logger;
+
+import net.pterodactylus.util.logging.Logging;
+
+/**
+ * Filter for newly inserted text. This filter strips HTTP links to the local
+ * node of identifying marks, e.g. a link to “http://localhost:8888/KSK@gpl.txt”
+ * will be converted to “KSK@gpl.txt”. This will only work for links that point
+ * to the same address Sone is accessed by, so if you access Sone using
+ * localhost:8888, links to 127.0.0.1:8888 will not be removed.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class TextFilter {
+
+       /** The logger. */
+       private static final Logger logger = Logging.getLogger(TextFilter.class);
+
+       /**
+        * Filters the given text, stripping the host header part for links to the
+        * local node.
+        *
+        * @param hostHeader
+        *            The host header from the request
+        * @param text
+        *            The text to filter
+        * @return The filtered text
+        */
+       public static String filter(String hostHeader, String text) {
+
+               /* filter http(s) links to own node. */
+               if (hostHeader != null) {
+                       String line = text;
+                       for (String toRemove : new String[] { "http://" + hostHeader + "/", "https://" + hostHeader + "/", "http://" + hostHeader, "https://" + hostHeader }) {
+                               while (line.indexOf(toRemove) != -1) {
+                                       line = line.replace(toRemove, "");
+                               }
+                       }
+                       return line;
+               }
+
+               /* not modified. */
+               return text;
+       }
+
+}