convert raw JSP to servlet

fixes #3013

Author: Vladimir Kotal

opengrok-web/src/main/java/org/opengrok/web/GetFile.java

@@ -0,0 +1,110 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * See LICENSE.txt included in this distribution for the specific
+ * language governing permissions and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at LICENSE.txt.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+package org.opengrok.web;
+
+/*
+ * Copyright (c) 2008, 2020, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Portions Copyright 2011 Jens Elkner.
+ */
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import org.opengrok.indexer.history.HistoryGuru;
+import org.opengrok.indexer.web.PageConfig;
+import org.opengrok.indexer.web.Prefix;
+
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class GetFile extends HttpServlet {
+
+    public static final long serialVersionUID = -1;
+
+    @Override
+    protected void service(final HttpServletRequest request, final HttpServletResponse response) throws IOException {
+        PageConfig cfg = PageConfig.get(request);
+        cfg.checkSourceRootExistence();
+
+        String redir = cfg.canProcess();
+        if (redir == null || redir.length() > 0) {
+            if (redir != null) {
+                response.sendRedirect(redir);
+            } else {
+                response.sendError(HttpServletResponse.SC_NOT_FOUND);
+            }
+            return;
+        }
+
+        File f = cfg.getResourceFile();
+        String revision = cfg.getRequestedRevision();
+        if (revision.length() == 0) {
+            revision = null;
+        }
+
+        InputStream in = null;
+        try {
+            if (revision != null) {
+                in = HistoryGuru.getInstance().getRevision(f.getParent(),
+                        f.getName(), revision);
+            } else {
+                long flast = cfg.getLastModified();
+                if (request.getDateHeader("If-Modified-Since") >= flast) {
+                    response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
+                    return;
+                }
+                in = new FileInputStream(f);
+                response.setContentLength((int) f.length());
+                response.setDateHeader("Last-Modified", f.lastModified());
+            }
+        } catch (
+                Exception e) {
+            response.sendError(HttpServletResponse.SC_NOT_FOUND);
+            return;
+        }
+
+        String mimeType = getServletContext().getMimeType(f.getAbsolutePath());
+        response.setContentType(mimeType);
+
+        try {
+            if (cfg.getPrefix() == Prefix.DOWNLOAD_P) {
+                response.setHeader("content-disposition", "attachment; filename="
+                        + f.getName());
+            } else {
+                response.setHeader("content-type", "text/plain");
+            }
+            OutputStream o = response.getOutputStream();
+            byte[] buffer = new byte[8192];
+            int nr;
+            while ((nr = in.read(buffer)) > 0) {
+                o.write(buffer, 0, nr);
+            }
+            o.flush();
+            o.close();
+        } finally {
+            in.close();
+        }
+    }
+}

opengrok-web/src/main/webapp/WEB-INF/web.xml

@@ -126,7 +126,7 @@
     <servlet>
         <display-name>Raw Source lister</display-name>
         <servlet-name>raw</servlet-name>
-        <jsp-file>/raw.jsp</jsp-file>
+        <servlet-class>org.opengrok.web.GetFile</servlet-class>
         <init-param>
             <param-name>keepgenerated</param-name>
             <param-value>true</param-value>
@@ -135,7 +135,7 @@
     <servlet>
         <display-name>Download source</display-name>
         <servlet-name>download</servlet-name>
-        <jsp-file>/raw.jsp</jsp-file>
+        <servlet-class>org.opengrok.web.GetFile</servlet-class>
         <init-param>
             <param-name>keepgenerated</param-name>
             <param-value>true</param-value>