| /* |
| * $Id$ |
| * |
| * Copyright 2006 The Apache Software Foundation. |
| * |
| * 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.apache.struts2.interceptor; |
| |
| import java.io.File; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.StringTokenizer; |
| |
| import javax.servlet.http.HttpServletRequest; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.struts2.ServletActionContext; |
| import org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper; |
| |
| import com.opensymphony.xwork2.ActionContext; |
| import com.opensymphony.xwork2.ActionInvocation; |
| import com.opensymphony.xwork2.ActionProxy; |
| import com.opensymphony.xwork2.ValidationAware; |
| import com.opensymphony.xwork2.interceptor.AbstractInterceptor; |
| import com.opensymphony.xwork2.util.LocalizedTextUtil; |
| |
| /** |
| * <!-- START SNIPPET: description --> |
| * |
| * Interceptor that is based off of {@link MultiPartRequestWrapper}, which is automatically applied for any request that |
| * includes a file. It adds the following parameters, where [File Name] is the name given to the file uploaded by the |
| * HTML form: |
| * |
| * <ul> |
| * |
| * <li>[File Name] : File - the actual File</li> |
| * |
| * <li>[File Name]ContentType : String - the content type of the file</li> |
| * |
| * <li>[File Name]FileName : String - the actual name of the file uploaded (not the HTML name)</li> |
| * |
| * </ul> |
| * |
| * <p/> You can get access to these files by merely providing setters in your action that correspond to any of the three |
| * patterns above, such as setDocument(File document), setDocumentContentType(String contentType), etc. |
| * <br/>See the example code section. |
| * |
| * <p/> This interceptor will add several field errors, assuming that the action implements {@link ValidationAware}. |
| * These error messages are based on several i18n values stored in struts-messages.properties, a default i18n file |
| * processed for all i18n requests. You can override the text of these messages by providing text for the following |
| * keys: |
| * |
| * <ul> |
| * |
| * <li>struts.messages.error.uploading - a general error that occurs when the file could not be uploaded</li> |
| * |
| * <li>struts.messages.error.file.too.large - occurs when the uploaded file is too large</li> |
| * |
| * <li>struts.messages.error.content.type.not.allowed - occurs when the uploaded file does not match the expected |
| * content types specified</li> |
| * |
| * </ul> |
| * |
| * <!-- END SNIPPET: description --> |
| * |
| * <p/> <u>Interceptor parameters:</u> |
| * |
| * <!-- START SNIPPET: parameters --> |
| * |
| * <ul> |
| * |
| * <li>maximumSize (optional) - the maximum size (in bytes) that the interceptor will allow a file reference to be set |
| * on the action. Note, this is <b>not</b> related to the various properties found in struts.properties. |
| * Default to approximately 2MB.</li> |
| * |
| * <li>allowedTypes (optional) - a comma separated list of content types (ie: text/html) that the interceptor will allow |
| * a file reference to be set on the action. If none is specified allow all types to be uploaded.</li> |
| * |
| * </ul> |
| * |
| * <!-- END SNIPPET: parameters --> |
| * |
| * <p/> <u>Extending the interceptor:</u> |
| * |
| * <p/> |
| * |
| * <!-- START SNIPPET: extending --> |
| * |
| * You can extend this interceptor and override the {@link #acceptFile} method to provide more control over which files |
| * are supported and which are not. |
| * |
| * <!-- END SNIPPET: extending --> |
| * |
| * <p/> <u>Example code:</u> |
| * |
| * <pre> |
| * <!-- START SNIPPET: example --> |
| * <action name="doUpload" class="com.examples.UploadAction"> |
| * <interceptor-ref name="fileUpload"/> |
| * <interceptor-ref name="basicStack"/> |
| * <result name="success">good_result.ftl</result> |
| * </action> |
| * </pre> |
| * |
| * And then you need to set encoding <code>multipart/form-data</code> in the form where the user selects the file to upload. |
| * <pre> |
| * <a:form action="doUpload" method="post" enctype="multipart/form-data"> |
| * <a:file name="upload" label="File"/> |
| * <a:submit/> |
| * </a:form> |
| * </pre> |
| * |
| * And then in your action code you'll have access to the File object if you provide setters according to the |
| * naming convention documented in the start. |
| * |
| * <pre> |
| * public com.examples.UploadAction implemements Action { |
| * private File file; |
| * private String contentType; |
| * private String filename; |
| * |
| * public void setUpload(File file) { |
| * this.file = file; |
| * } |
| * |
| * public void setUploadContentType(String contentType) { |
| * this.contentType = contentType; |
| * } |
| * |
| * public void setUploadFileName(String filename) { |
| * this.filename = filename; |
| * } |
| * |
| * ... |
| * } |
| * </pre> |
| * <!-- END SNIPPET: example --> |
| * |
| */ |
| public class FileUploadInterceptor extends AbstractInterceptor { |
| |
| private static final long serialVersionUID = -4764627478894962478L; |
| |
| protected static final Log log = LogFactory.getLog(FileUploadInterceptor.class); |
| private static final String DEFAULT_DELIMITER = ","; |
| private static final String DEFAULT_MESSAGE = "no.message.found"; |
| |
| protected Long maximumSize; |
| protected String allowedTypes; |
| protected Set allowedTypesSet = Collections.EMPTY_SET; |
| |
| /** |
| * Sets the allowed mimetypes |
| * |
| * @param allowedTypes A comma-delimited list of types |
| */ |
| public void setAllowedTypes(String allowedTypes) { |
| this.allowedTypes = allowedTypes; |
| |
| // set the allowedTypes as a collection for easier access later |
| allowedTypesSet = getDelimitedValues(allowedTypes); |
| } |
| |
| /** |
| * Sets the maximum size of an uploaded file |
| * |
| * @param maximumSize The maximum size in bytes |
| */ |
| public void setMaximumSize(Long maximumSize) { |
| this.maximumSize = maximumSize; |
| } |
| |
| /* (non-Javadoc) |
| * @see com.opensymphony.xwork2.interceptor.Interceptor#intercept(com.opensymphony.xwork2.ActionInvocation) |
| */ |
| public String intercept(ActionInvocation invocation) throws Exception { |
| ActionContext ac = invocation.getInvocationContext(); |
| HttpServletRequest request = (HttpServletRequest) ac.get(ServletActionContext.HTTP_REQUEST); |
| |
| if (!(request instanceof MultiPartRequestWrapper)) { |
| if (log.isDebugEnabled()) { |
| ActionProxy proxy = invocation.getProxy(); |
| log.debug(getTextMessage("struts.messages.bypass.request", new Object[]{proxy.getNamespace(), proxy.getActionName()}, ActionContext.getContext().getLocale())); |
| } |
| |
| return invocation.invoke(); |
| } |
| |
| final Object action = invocation.getAction(); |
| ValidationAware validation = null; |
| |
| if (action instanceof ValidationAware) { |
| validation = (ValidationAware) action; |
| } |
| |
| MultiPartRequestWrapper multiWrapper = (MultiPartRequestWrapper) request; |
| |
| if (multiWrapper.hasErrors()) { |
| for (Iterator errorIter = multiWrapper.getErrors().iterator(); errorIter.hasNext();) { |
| String error = (String) errorIter.next(); |
| |
| if (validation != null) { |
| validation.addActionError(error); |
| } |
| |
| log.error(error); |
| } |
| } |
| |
| Map parameters = ac.getParameters(); |
| |
| // Bind allowed Files |
| Enumeration fileParameterNames = multiWrapper.getFileParameterNames(); |
| while (fileParameterNames != null && fileParameterNames.hasMoreElements()) { |
| // get the value of this input tag |
| String inputName = (String) fileParameterNames.nextElement(); |
| |
| // get the content type |
| String[] contentType = multiWrapper.getContentTypes(inputName); |
| |
| if (isNonEmpty(contentType)) { |
| // get the name of the file from the input tag |
| String[] fileName = multiWrapper.getFileNames(inputName); |
| |
| if (isNonEmpty(fileName)) { |
| // Get a File object for the uploaded File |
| File[] files = multiWrapper.getFiles(inputName); |
| if (files != null) { |
| for (int index = 0; index < files.length; index++) { |
| getTextMessage("struts.messages.current.file", new Object[]{inputName, contentType[index], fileName[index], files[index]}, ActionContext.getContext().getLocale()); |
| |
| if (acceptFile(files[0], contentType[0], inputName, validation, ac.getLocale())) { |
| parameters.put(inputName, files); |
| parameters.put(inputName + "ContentType", contentType); |
| parameters.put(inputName + "FileName", fileName); |
| } |
| } |
| } |
| } else { |
| log.error(getTextMessage("struts.messages.invalid.file", new Object[]{inputName}, ActionContext.getContext().getLocale())); |
| } |
| } else { |
| log.error(getTextMessage("struts.messages.invalid.content.type", new Object[]{inputName}, ActionContext.getContext().getLocale())); |
| } |
| } |
| |
| // invoke action |
| String result = invocation.invoke(); |
| |
| // cleanup |
| fileParameterNames = multiWrapper.getFileParameterNames(); |
| while (fileParameterNames != null && fileParameterNames.hasMoreElements()) { |
| String inputValue = (String) fileParameterNames.nextElement(); |
| File[] file = multiWrapper.getFiles(inputValue); |
| for (int index = 0; index < file.length; index++) { |
| File currentFile = file[index]; |
| log.info(getTextMessage("struts.messages.removing.file", new Object[]{inputValue, currentFile}, ActionContext.getContext().getLocale())); |
| |
| if ((currentFile != null) && currentFile.isFile()) { |
| currentFile.delete(); |
| } |
| } |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Override for added functionality. Checks if the proposed file is acceptable based on contentType and size. |
| * |
| * @param file - proposed upload file. |
| * @param contentType - contentType of the file. |
| * @param inputName - inputName of the file. |
| * @param validation - Non-null ValidationAware if the action implements ValidationAware, allowing for better |
| * logging. |
| * @param locale |
| * @return true if the proposed file is acceptable by contentType and size. |
| */ |
| protected boolean acceptFile(File file, String contentType, String inputName, ValidationAware validation, Locale locale) { |
| boolean fileIsAcceptable = false; |
| |
| // If it's null the upload failed |
| if (file == null) { |
| String errMsg = getTextMessage("struts.messages.error.uploading", new Object[]{inputName}, locale); |
| if (validation != null) { |
| validation.addFieldError(inputName, errMsg); |
| } |
| |
| log.error(errMsg); |
| } else if (maximumSize != null && maximumSize.longValue() < file.length()) { |
| String errMsg = getTextMessage("struts.messages.error.file.too.large", new Object[]{inputName, file.getName(), "" + file.length()}, locale); |
| if (validation != null) { |
| validation.addFieldError(inputName, errMsg); |
| } |
| |
| log.error(errMsg); |
| } else if ((! allowedTypesSet.isEmpty()) && (!containsItem(allowedTypesSet, contentType))) { |
| String errMsg = getTextMessage("struts.messages.error.content.type.not.allowed", new Object[]{inputName, file.getName(), contentType}, locale); |
| if (validation != null) { |
| validation.addFieldError(inputName, errMsg); |
| } |
| |
| log.error(errMsg); |
| } else { |
| fileIsAcceptable = true; |
| } |
| |
| return fileIsAcceptable; |
| } |
| |
| /** |
| * @param itemCollection - Collection of string items (all lowercase). |
| * @param key - Key to search for. |
| * @return true if itemCollection contains the key, false otherwise. |
| */ |
| private static boolean containsItem(Collection itemCollection, String key) { |
| return itemCollection.contains(key.toLowerCase()); |
| } |
| |
| private static Set getDelimitedValues(String delimitedString) { |
| Set<String> delimitedValues = new HashSet<String>(); |
| if (delimitedString != null) { |
| StringTokenizer stringTokenizer = new StringTokenizer(delimitedString, DEFAULT_DELIMITER); |
| while (stringTokenizer.hasMoreTokens()) { |
| String nextToken = stringTokenizer.nextToken().toLowerCase().trim(); |
| if (nextToken.length() > 0) { |
| delimitedValues.add(nextToken); |
| } |
| } |
| } |
| return delimitedValues; |
| } |
| |
| private static boolean isNonEmpty(Object[] objArray) { |
| boolean result = false; |
| for (int index = 0; index < objArray.length && !result; index++) { |
| if (objArray[index] != null) { |
| result = true; |
| } |
| } |
| return result; |
| } |
| |
| private String getTextMessage(String messageKey, Object[] args, Locale locale) { |
| if (args == null || args.length == 0) { |
| return LocalizedTextUtil.findText(this.getClass(), messageKey, locale); |
| } else { |
| return LocalizedTextUtil.findText(this.getClass(), messageKey, locale, DEFAULT_MESSAGE, args); |
| } |
| } |
| } |