Clean solution to solve RAP specific file download service issue revealed by the...

[lgpl/argeo-commons.git] / base / runtime / org.argeo.eclipse.ui.rap / src / main / java / org / argeo / eclipse / ui / specific / FileDownloadService.java

diff --git a/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/FileDownloadService.java b/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/FileDownloadService.java
new file mode 100644 (file)
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+++ b/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/FileDownloadService.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * 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.argeo.eclipse.ui.specific;
+
+import java.io.File;
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.io.FileUtils;
+import org.argeo.ArgeoException;
+import org.eclipse.rap.rwt.service.ServiceHandler;
+
+/** Provide a basic handler that returns a file from the file system in Rap. */
+public class FileDownloadService implements ServiceHandler {
+       public final static String PARAM_FILE_NAME = "param.fileName";
+       public final static String PARAM_FILE_PATH = "param.filePath";
+       
+       public FileDownloadService() {
+       }
+
+       public void service(HttpServletRequest request, HttpServletResponse response)
+                       throws IOException, ServletException {
+               String fileName = request.getParameter(PARAM_FILE_NAME);
+               String path = request.getParameter(PARAM_FILE_PATH);
+
+               // Get the file
+               File file = new File(path);
+
+               // Send the Metadata
+               response.setContentType("application/octet-stream");
+               response.setContentLength((int) file.length());
+               String contentDisposition = "attachment; filename=\"" + fileName + "\"";
+               response.setHeader("Content-Disposition", contentDisposition);
+
+               try {
+                       response.getOutputStream().write(
+                                       FileUtils.readFileToByteArray(new File(path)));
+               } catch (IOException ioe) {
+                       throw new ArgeoException("Error while writing the file " + fileName
+                                       + " to the servlet response", ioe);
+               }
+       }
+}
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