package org.g4studio.core.mvc.xstruts.upload;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItem;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.g4studio.core.mvc.xstruts.Globals;
import org.g4studio.core.mvc.xstruts.action.ActionMapping;
import org.g4studio.core.mvc.xstruts.action.ActionServlet;
import org.g4studio.core.mvc.xstruts.config.ModuleConfig;
/**
* <p>
* This class implements the <code>MultipartRequestHandler</code> interface by
* providing a wrapper around the Jakarta Commons FileUpload library.
* </p>
*
* @version $Rev: 421119 $ $Date: 2006-07-11 21:49:11 -0700 (Tue, 11 Jul 2006) $
* @since Struts 1.1
*/
public class CommonsMultipartRequestHandler implements MultipartRequestHandler {
// ----------------------------------------------------- Manifest Constants
/**
* <p>
* The default value for the maximum allowable size, in bytes, of an
* uploaded file. The value is equivalent to 250MB.
* </p>
*/
public static final long DEFAULT_SIZE_MAX = 250 * 1024 * 1024;
/**
* <p>
* The default value for the threshold which determines whether an uploaded
* file will be written to disk or cached in memory. The value is equivalent
* to 250KB.
* </p>
*/
public static final int DEFAULT_SIZE_THRESHOLD = 256 * 1024;
// ----------------------------------------------------- Instance Variables
/**
* <p>
* Commons Logging instance.
* </p>
*/
protected static Log log = LogFactory.getLog(CommonsMultipartRequestHandler.class);
/**
* <p>
* The combined text and file request parameters.
* </p>
*/
private Hashtable elementsAll;
/**
* <p>
* The file request parameters.
* </p>
*/
private Hashtable elementsFile;
/**
* <p>
* The text request parameters.
* </p>
*/
private Hashtable elementsText;
/**
* <p>
* The action mapping with which this handler is associated.
* </p>
*/
private ActionMapping mapping;
/**
* <p>
* The servlet with which this handler is associated.
* </p>
*/
private ActionServlet servlet;
// ---------------------------------------- MultipartRequestHandler Methods
/**
* <p>
* Retrieves the servlet with which this handler is associated.
* </p>
*
* @return The associated servlet.
*/
public ActionServlet getServlet() {
return this.servlet;
}
/**
* <p>
* Sets the servlet with which this handler is associated.
* </p>
*
* @param servlet
* The associated servlet.
*/
public void setServlet(ActionServlet servlet) {
this.servlet = servlet;
}
/**
* <p>
* Retrieves the action mapping with which this handler is associated.
* </p>
*
* @return The associated action mapping.
*/
public ActionMapping getMapping() {
return this.mapping;
}
/**
* <p>
* Sets the action mapping with which this handler is associated.
* </p>
*
* @param mapping
* The associated action mapping.
*/
public void setMapping(ActionMapping mapping) {
this.mapping = mapping;
}
/**
* <p>
* Parses the input stream and partitions the parsed items into a set of
* form fields and a set of file items. In the process, the parsed items are
* translated from Commons FileUpload <code>FileItem</code> instances to
* Struts <code>FormFile</code> instances.
* </p>
*
* @param request
* The multipart request to be processed.
* @throws ServletException
* if an unrecoverable error occurs.
*/
public void handleRequest(HttpServletRequest request) throws ServletException {
// Get the app config for the current request.
ModuleConfig ac = (ModuleConfig) request.getAttribute(Globals.MODULE_KEY);
// Create and configure a DIskFileUpload instance.
DiskFileUpload upload = new DiskFileUpload();
// The following line is to support an "EncodingFilter"
// see http://issues.apache.org/bugzilla/show_bug.cgi?id=23255
upload.setHeaderEncoding(request.getCharacterEncoding());
// Set the maximum size before a FileUploadException will be thrown.
upload.setSizeMax(getSizeMax(ac));
// Set the maximum size that will be stored in memory.
upload.setSizeThreshold((int) getSizeThreshold(ac));
// Set the the location for saving data on disk.
upload.setRepositoryPath(getRepositoryPath(ac));
// Create the hash tables to be populated.
elementsText = new Hashtable();
elementsFile = new Hashtable();
elementsAll = new Hashtable();
// Parse the request into file items.
List items = null;
try {
items = upload.parseRequest(request);
} catch (DiskFileUpload.SizeLimitExceededException e) {
// Special handling for uploads that are too big.
request.setAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED, Boolean.TRUE);
return;
} catch (FileUploadException e) {
log.error("Failed to parse multipart request", e);
throw new ServletException(e);
}
// Partition the items into form fields and files.
Iterator iter = items.iterator();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (item.isFormField()) {
addTextParameter(request, item);
} else {
addFileParameter(item);
}
}
}
/**
* <p>
* Returns a hash table containing the text (that is, non-file) request
* parameters.
* </p>
*
* @return The text request parameters.
*/
public Hashtable getTextElements() {
return this.elementsText;
}
/**
* <p>
* Returns a hash table containing the file (that is, non-text) request
* parameters.
* </p>
*
* @return The file request parameters.
*/
public Hashtable getFileElements() {
return this.elementsFile;
}
/**
* <p>
* Returns a hash table containing both text and file request parameters.
* </p>
*
* @return The text and file request parameters.
*/
public Hashtable getAllElements() {
return this.elementsAll;
}
/**
* <p>
* Cleans up when a problem occurs during request processing.
* </p>
*/
public void rollback() {
Iterator iter = elementsFile.values().iterator();
while (iter.hasNext()) {
FormFile formFile = (FormFile) iter.next();
formFile.destroy();
}
}
/**
* <p>
* Cleans up at the end of a request.
* </p>
*/
public void finish() {
rollback();
}
// -------------------------------------------------------- Support Methods
/**
* <p>
* Returns the maximum allowable size, in bytes, of an uploaded file. The
* value is obtained from the current module's controller configuration.
* </p>
*
* @param mc
* The current module's configuration.
* @return The maximum allowable file size, in bytes.
*/
protected long getSizeMax(ModuleConfig mc) {
return convertSizeToBytes(mc.getControllerConfig().getMaxFileSize(), DEFAULT_SIZE_MAX);
}
/**
* <p>
* Returns the size threshold which determines whether an uploaded file will
* be written to disk or cached in memory.
* </p>
*
* @param mc
* The current module's configuration.
* @return The size threshold, in bytes.
*/
protected long getSizeThreshold(ModuleConfig mc) {
return convertSizeToBytes(mc.getControllerConfig().getMemFileSize(), DEFAULT_SIZE_THRESHOLD);
}
/**
* <p>
* Converts a size value from a string representation to its numeric value.
* The string must be of the form nnnm, where nnn is an arbitrary decimal
* value, and m is a multiplier. The multiplier must be one of 'K', 'M' and
* 'G', representing kilobytes, megabytes and gigabytes respectively.
* </p>
* <p>
* If the size value cannot be converted, for example due to invalid syntax,
* the supplied default is returned instead.
* </p>
*
* @param sizeString
* The string representation of the size to be converted.
* @param defaultSize
* The value to be returned if the string is invalid.
* @return The actual size in bytes.
*/
protected long convertSizeToBytes(String sizeString, long defaultSize) {
int multiplier = 1;
if (sizeString.endsWith("K")) {
multiplier = 1024;
} else if (sizeString.endsWith("M")) {
multiplier = 1024 * 1024;
} else if (sizeString.endsWith("G")) {
multiplier = 1024 * 1024 * 1024;
}
if (multiplier != 1) {
sizeString = sizeString.substring(0, sizeString.length() - 1);
}
long size = 0;
try {
size = Long.parseLong(sizeString);
} catch (NumberFormatException nfe) {
log.warn("Invalid format for file size ('" + sizeString + "'). Using default.");
size = defaultSize;
multiplier = 1;
}
return (size * multiplier);
}
/**
* <p>
* Returns the path to the temporary directory to be used for uploaded files
* which are written to disk. The directory used is determined from the
* first of the following to be non-empty.
* <ol>
* <li>A temp dir explicitly defined either using the <code>tempDir</code>
* servlet init param, or the <code>tempDir</code> attribute of the
* <controller> element in the Struts config file.</li>
* <li>The container-specified temp dir, obtained from the
* <code>javax.servlet.context.tempdir</code> servlet context attribute.</li>
* <li>The temp dir specified by the <code>java.io.tmpdir</code> system
* property.</li> (/ol>
* </p>
*
* @param mc
* The module config instance for which the path should be
* determined.
* @return The path to the directory to be used to store uploaded files.
*/
protected String getRepositoryPath(ModuleConfig mc) {
// First, look for an explicitly defined temp dir.
String tempDir = mc.getControllerConfig().getTempDir();
// If none, look for a container specified temp dir.
if ((tempDir == null) || (tempDir.length() == 0)) {
if (servlet != null) {
ServletContext context = servlet.getServletContext();
File tempDirFile = (File) context.getAttribute("javax.servlet.context.tempdir");
tempDir = tempDirFile.getAbsolutePath();
}
// If none, pick up the system temp dir.
if ((tempDir == null) || (tempDir.length() == 0)) {
tempDir = System.getProperty("java.io.tmpdir");
}
}
if (log.isTraceEnabled()) {
log.trace("File upload temp dir: " + tempDir);
}
return tempDir;
}
/**
* <p>
* Adds a regular text parameter to the set of text parameters for this
* request and also to the list of all parameters. Handles the case of
* multiple values for the same parameter by using an array for the
* parameter value.
* </p>
*
* @param request
* The request in which the parameter was specified.
* @param item
* The file item for the parameter to add.
*/
protected void addTextParameter(HttpServletRequest request, FileItem item) {
String name = item.getFieldName();
String value = null;
boolean haveValue = false;
String encoding = null;
if (item instanceof DiskFileItem) {
encoding = ((DiskFileItem) item).getCharSet();
if (log.isDebugEnabled()) {
log.debug("DiskFileItem.getCharSet=[" + encoding + "]");
}
}
if (encoding == null) {
encoding = request.getCharacterEncoding();
if (log.isDebugEnabled()) {
log.debug("request.getCharacterEncoding=[" + encoding + "]");
}
}
if (encoding != null) {
try {
value = item.getString(encoding);
haveValue = true;
} catch (Exception e) {
// Handled below, since haveValue is false.
}
}
if (!haveValue) {
try {
value = item.getString("ISO-8859-1");
} catch (java.io.UnsupportedEncodingException uee) {
value = item.getString();
}
haveValue = true;
}
if (request instanceof MultipartRequestWrapper) {
MultipartRequestWrapper wrapper = (MultipartRequestWrapper) request;
wrapper.setParameter(name, value);
}
String[] oldArray = (String[]) elementsText.get(name);
String[] newArray;
if (oldArray != null) {
newArray = new String[oldArray.length + 1];
System.arraycopy(oldArray, 0, newArray, 0, oldArray.length);
newArray[oldArray.length] = value;
} else {
newArray = new String[] { value };
}
elementsText.put(name, newArray);
elementsAll.put(name, newArray);
}
/**
* <p>
* Adds a file parameter to the set of file parameters for this request and
* also to the list of all parameters.
* </p>
*
* @param item
* The file item for the parameter to add.
*/
protected void addFileParameter(FileItem item) {
FormFile formFile = new CommonsFormFile(item);
elementsFile.put(item.getFieldName(), formFile);
elementsAll.put(item.getFieldName(), formFile);
}
// ---------------------------------------------------------- Inner Classes
/**
* <p>
* This class implements the Struts <code>FormFile</code> interface by
* wrapping the Commons FileUpload <code>FileItem</code> interface. This
* implementation is <i>read-only</i>; any attempt to modify an instance of
* this class will result in an <code>UnsupportedOperationException</code>.
* </p>
*/
static class CommonsFormFile implements FormFile, Serializable {
/**
* <p>
* The <code>FileItem</code> instance wrapped by this object.
* </p>
*/
FileItem fileItem;
/**
* Constructs an instance of this class which wraps the supplied file
* item. </p>
*
* @param fileItem
* The Commons file item to be wrapped.
*/
public CommonsFormFile(FileItem fileItem) {
this.fileItem = fileItem;
}
/**
* <p>
* Returns the content type for this file.
* </p>
*
* @return A String representing content type.
*/
public String getContentType() {
return fileItem.getContentType();
}
/**
* <p>
* Sets the content type for this file.
* <p>
* NOTE: This method is not supported in this implementation.
* </p>
*
* @param contentType
* A string representing the content type.
*/
public void setContentType(String contentType) {
throw new UnsupportedOperationException("The setContentType() method is not supported.");
}
/**
* <p>
* Returns the size, in bytes, of this file.
* </p>
*
* @return The size of the file, in bytes.
*/
public int getFileSize() {
return (int) fileItem.getSize();
}
/**
* <p>
* Sets the size, in bytes, for this file.
* <p>
* NOTE: This method is not supported in this implementation.
* </p>
*
* @param filesize
* The size of the file, in bytes.
*/
public void setFileSize(int filesize) {
throw new UnsupportedOperationException("The setFileSize() method is not supported.");
}
/**
* <p>
* Returns the (client-side) file name for this file.
* </p>
*
* @return The client-size file name.
*/
public String getFileName() {
return getBaseFileName(fileItem.getName());
}
/**
* <p>
* Sets the (client-side) file name for this file.
* <p>
* NOTE: This method is not supported in this implementation.
* </p>
*
* @param fileName
* The client-side name for the file.
*/
public void setFileName(String fileName) {
throw new UnsupportedOperationException("The setFileName() method is not supported.");
}
/**
* <p>
* Returns the data for this file as a byte array. Note that this may
* result in excessive memory usage for large uploads. The use of the
* {@link #getInputStream() getInputStream} method is encouraged as an
* alternative.
* </p>
*
* @return An array of bytes representing the data contained in this
* form file.
* @throws FileNotFoundException
* If some sort of file representation cannot be found for
* the FormFile
* @throws IOException
* If there is some sort of IOException
*/
public byte[] getFileData() throws FileNotFoundException, IOException {
return fileItem.get();
}
/**
* <p>
* Get an InputStream that represents this file. This is the preferred
* method of getting file data.
* </p>
*
* @throws FileNotFoundException
* If some sort of file representation cannot be found for
* the FormFile
* @throws IOException
* If there is some sort of IOException
*/
public InputStream getInputStream() throws FileNotFoundException, IOException {
return fileItem.getInputStream();
}
/**
* <p>
* Destroy all content for this form file. Implementations should remove
* any temporary files or any temporary file data stored somewhere
* </p>
*/
public void destroy() {
fileItem.delete();
}
/**
* <p>
* Returns the base file name from the supplied file path. On the
* surface, this would appear to be a trivial task. Apparently, however,
* some Linux JDKs do not implement <code>File.getName()</code>
* correctly for Windows paths, so we attempt to take care of that here.
* </p>
*
* @param filePath
* The full path to the file.
* @return The base file name, from the end of the path.
*/
protected String getBaseFileName(String filePath) {
// First, ask the JDK for the base file name.
String fileName = new File(filePath).getName();
// Now check for a Windows file name parsed incorrectly.
int colonIndex = fileName.indexOf(":");
if (colonIndex == -1) {
// Check for a Windows SMB file path.
colonIndex = fileName.indexOf("\\\\");
}
int backslashIndex = fileName.lastIndexOf("\\");
if ((colonIndex > -1) && (backslashIndex > -1)) {
// Consider this filename to be a full Windows path, and parse
// it
// accordingly to retrieve just the base file name.
fileName = fileName.substring(backslashIndex + 1);
}
return fileName;
}
/**
* <p>
* Returns the (client-side) file name for this file.
* </p>
*
* @return The client-size file name.
*/
public String toString() {
return getFileName();
}
}
}