1 files changed, 108 insertions, 0 deletions
diff --git a/utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencerImpl.java b/utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencerImpl.java
new file mode 100644
index 00000000..d1a68c46
--- /dev/null
+++ b/utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencerImpl.java
@@ -0,0 +1,108 @@
+/*
+* Copyright 2008 Federal Chancellery Austria and
+* Graz University of Technology
+*
+* 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 at.gv.egiz.bku.utils.urldereferencer;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLSocketFactory;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Class used to dereference (external URLs).
+ * 
+ * @author wbauer
+ * 
+ */
+public class URLDereferencerImpl implements URLDereferencer {
+
+  private final Logger log = LoggerFactory.getLogger(URLDereferencerImpl.class);
+
+  private static URLDereferencerImpl instance = new URLDereferencerImpl();
+
+  private Map<String, URLProtocolHandler> handlerMap = new HashMap<String, URLProtocolHandler>();
+
+  private HostnameVerifier hostnameVerifier;
+  private SSLSocketFactory sslSocketFactory;
+  
+  private URLDereferencerImpl() {
+    registerHandlers();
+  }
+
+  /**
+   * 
+   * @param aUrl
+   *          must not be null
+   * @throws MalformedURLException
+   *           if the protocol is not supported
+   * @throws IOException if the url cannot be dereferenced (e.g. formdata not provided)
+   *           
+   */
+  @Override
+  public StreamData dereference(String aUrl)
+      throws IOException {
+    log.debug("Looking for handler for URL: {}.", aUrl);
+    int i = aUrl.indexOf(":");
+    if (i == -1) {
+      throw new MalformedURLException("Invalid url: " + aUrl);
+    }
+    String protocol = aUrl.substring(0, i).toLowerCase().trim();
+    URLProtocolHandler handler = handlerMap.get(protocol);
+    if (handler == null) {
+      throw new MalformedURLException("No handler for protocol: " + protocol
+          + " found");
+    }
+    handler.setHostnameVerifier(hostnameVerifier);
+    handler.setSSLSocketFactory(sslSocketFactory);
+    return handler.dereference(aUrl);
+  }
+
+  /**
+   * Registers a handler for a protocol.
+   * 
+   * @param aProtocol
+   * @param aHandler
+   *          may be set to null to disable this protocol
+   */
+  public void registerHandler(String aProtocol, URLProtocolHandler aHandler) {
+    handlerMap.put(aProtocol.toLowerCase(), aHandler);
+  }
+
+  public static URLDereferencerImpl getInstance() {
+    return instance;
+  }
+
+  protected void registerHandlers() {
+    URLProtocolHandler handler = new HTTPURLProtocolHandlerImpl();
+    for (String proto : HTTPURLProtocolHandlerImpl.PROTOCOLS) {
+      handlerMap.put(proto, handler);
+    }
+  }
+  
+  public void setHostnameVerifier(HostnameVerifier hostnameVerifier) {
+    this.hostnameVerifier = hostnameVerifier;
+  }
+
+  public void setSSLSocketFactory(SSLSocketFactory socketFactory) {
+    this.sslSocketFactory = socketFactory;
+  }
+}