138 lines
4.1 KiB
Java
138 lines
4.1 KiB
Java
/**
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*
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*/
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package org.gcube.portlets.user.td.gwtservice.server;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import org.gcube.portlets.user.td.gwtservice.server.storage.FilesStorage;
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import org.gcube.portlets.user.td.gwtservice.server.util.ServiceCredentials;
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import org.gcube.portlets.user.td.gwtservice.shared.Constants;
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import org.gcube.portlets.user.td.gwtservice.shared.exception.TDGWTServiceException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Returns a chart file from storage
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*
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* @author Giancarlo Panichi
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*
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*
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*/
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public class RetrieveChartFileServlet extends HttpServlet {
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private static final long serialVersionUID = -1649268678733476057L;
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private static Logger logger = LoggerFactory
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.getLogger(RetrieveChartFileServlet.class);
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private static final String ATTRIBUTE_STORAGE_URI = "storageURI";
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private static final String IMAGE_MIME_TYPE = "image/jpeg";
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private static final int BUFSIZE = 4096;
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protected void doPost(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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handleRequest(req, resp);
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}
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protected void doGet(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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handleRequest(req, resp);
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}
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protected void handleRequest(HttpServletRequest request,
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HttpServletResponse response) throws ServletException, IOException {
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try {
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logger.info("RetrieveChartFileServlet");
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long startTime = System.currentTimeMillis();
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HttpSession session = request.getSession();
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if (session == null) {
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logger.error("Error getting the session, no session valid found: "
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+ session);
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response.sendError(
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HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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"ERROR-Error getting the user session, no session found "
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+ session);
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return;
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}
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logger.debug("RetrieveChartFileServlet session id: "
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+ session.getId());
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@SuppressWarnings("unused")
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ServiceCredentials serviceCredentials;
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String scopeGroupId = request.getHeader(Constants.CURR_GROUP_ID);
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if (scopeGroupId == null || scopeGroupId.isEmpty()) {
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scopeGroupId = request.getParameter(Constants.CURR_GROUP_ID);
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if (scopeGroupId == null || scopeGroupId.isEmpty()) {
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logger.error("CURR_GROUP_ID is null, it is a mandatory parameter in custom servlet: "
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+ scopeGroupId);
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throw new ServletException(
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"CURR_GROUP_ID is null, it is a mandatory parameter in custom servlet: "
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+ scopeGroupId);
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}
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}
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try {
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serviceCredentials = SessionUtil.getServiceCredentials(request,
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scopeGroupId);
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} catch (TDGWTServiceException e) {
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logger.error(
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"Error retrieving credentials:"
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+ e.getLocalizedMessage(), e);
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throw new ServletException(e.getLocalizedMessage());
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}
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String uri = (String) request.getParameter(ATTRIBUTE_STORAGE_URI);
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logger.debug("Request storage uri: " + uri);
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if (uri == null || uri.isEmpty()) {
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logger.error("Error getting request uri: " + uri);
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response.sendError(
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HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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"ERROR-Error getting request uri: " + session);
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return;
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}
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FilesStorage storage = new FilesStorage();
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InputStream in = storage.retrieveInputStream(uri);
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OutputStream out = response.getOutputStream();
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response.setContentType(IMAGE_MIME_TYPE);
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byte[] byteBuffer = new byte[BUFSIZE];
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int length = 0;
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while ((in != null) && ((length = in.read(byteBuffer)) != -1)) {
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out.write(byteBuffer, 0, length);
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}
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response.setStatus(HttpServletResponse.SC_OK);
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in.close();
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out.close();
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logger.trace("Response in "
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+ (System.currentTimeMillis() - startTime));
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} catch (Throwable e) {
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logger.error(
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"Error retrieving file from storage: "
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+ e.getLocalizedMessage(), e);
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response.sendError(
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HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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"Error retrieving file from storage: "
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+ e.getLocalizedMessage());
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return;
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}
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}
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}
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