/*
* $Id: RestActionMapper.java 1039579 2010-11-26 22:23:25Z lukaszlenart $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.rest;
import com.opensymphony.xwork2.config.Configuration;
import com.opensymphony.xwork2.config.ConfigurationManager;
import com.opensymphony.xwork2.config.entities.PackageConfig;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import org.apache.struts2.StrutsConstants;
import org.apache.struts2.dispatcher.mapper.ActionMapping;
import org.apache.struts2.dispatcher.mapper.DefaultActionMapper;
import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Iterator;
/**
* <!-- START SNIPPET: description -->
* <p/>
* This Restful action mapper enforces Ruby-On-Rails Rest-style mappings. If the method
* is not specified (via '!' or 'method:' prefix), the method is "guessed" at using
* ReST-style conventions that examine the URL and the HTTP method. Special care has
* been given to ensure this mapper works correctly with the codebehind plugin so that
* XML configuration is unnecessary.
* <p/>
* <p>
* This mapper supports the following parameters:
* </p>
* <ul>
* <li><code>struts.mapper.idParameterName</code> - If set, this value will be the name
* of the parameter under which the id is stored. The id will then be removed
* from the action name. Whether or not the method is specified, the mapper will
* try to truncate the identifier from the url and store it as a parameter.
* </li>
* <li><code>struts.mapper.indexMethodName</code> - The method name to call for a GET
* request with no id parameter. Defaults to 'index'.
* </li>
* <li><code>struts.mapper.getMethodName</code> - The method name to call for a GET
* request with an id parameter. Defaults to 'show'.
* </li>
* <li><code>struts.mapper.postMethodName</code> - The method name to call for a POST
* request with no id parameter. Defaults to 'create'.
* </li>
* <li><code>struts.mapper.putMethodName</code> - The method name to call for a PUT
* request with an id parameter. Defaults to 'update'.
* </li>
* <li><code>struts.mapper.deleteMethodName</code> - The method name to call for a DELETE
* request with an id parameter. Defaults to 'destroy'.
* </li>
* <li><code>struts.mapper.editMethodName</code> - The method name to call for a GET
* request with an id parameter and the 'edit' view specified. Defaults to 'edit'.
* </li>
* <li><code>struts.mapper.newMethodName</code> - The method name to call for a GET
* request with no id parameter and the 'new' view specified. Defaults to 'editNew'.
* </li>
* </ul>
* <p>
* The following URL's will invoke its methods:
* </p>
* <ul>
* <li><code>GET: /movies => method="index"</code></li>
* <li><code>GET: /movies/Thrillers => method="show", id="Thrillers"</code></li>
* <li><code>GET: /movies/Thrillers;edit => method="edit", id="Thrillers"</code></li>
* <li><code>GET: /movies/Thrillers/edit => method="edit", id="Thrillers"</code></li>
* <li><code>GET: /movies/new => method="editNew"</code></li>
* <li><code>POST: /movies => method="create"</code></li>
* <li><code>PUT: /movies/Thrillers => method="update", id="Thrillers"</code></li>
* <li><code>DELETE: /movies/Thrillers => method="destroy", id="Thrillers"</code></li>
* </ul>
* <p>
* To simulate the HTTP methods PUT and DELETE, since they aren't supported by HTML,
* the HTTP parameter "_method" will be used.
* </p>
* <!-- END SNIPPET: description -->
*/
public class RestActionMapper extends DefaultActionMapper {
protected static final Logger LOG = LoggerFactory.getLogger(RestActionMapper.class);
public static final String HTTP_METHOD_PARAM = "_method";
private String idParameterName = "id";
private String indexMethodName = "index";
private String getMethodName = "show";
private String postMethodName = "create";
private String editMethodName = "edit";
private String newMethodName = "editNew";
private String deleteMethodName = "destroy";
private String putMethodName = "update";
private boolean allowDynamicMethodCalls = true;
public RestActionMapper() {
}
public String getIdParameterName() {
return idParameterName;
}
@Inject(required = false, value = StrutsConstants.STRUTS_ID_PARAMETER_NAME)
public void setIdParameterName(String idParameterName) {
this.idParameterName = idParameterName;
}
@Inject(required = false, value = "struts.mapper.indexMethodName")
public void setIndexMethodName(String indexMethodName) {
this.indexMethodName = indexMethodName;
}
@Inject(required = false, value = "struts.mapper.getMethodName")
public void setGetMethodName(String getMethodName) {
this.getMethodName = getMethodName;
}
@Inject(required = false, value = "struts.mapper.postMethodName")
public void setPostMethodName(String postMethodName) {
this.postMethodName = postMethodName;
}
@Inject(required = false, value = "struts.mapper.editMethodName")
public void setEditMethodName(String editMethodName) {
this.editMethodName = editMethodName;
}
@Inject(required = false, value = "struts.mapper.newMethodName")
public void setNewMethodName(String newMethodName) {
this.newMethodName = newMethodName;
}
@Inject(required = false, value = "struts.mapper.deleteMethodName")
public void setDeleteMethodName(String deleteMethodName) {
this.deleteMethodName = deleteMethodName;
}
@Inject(required = false, value = "struts.mapper.putMethodName")
public void setPutMethodName(String putMethodName) {
this.putMethodName = putMethodName;
}
@Inject(required = false, value = StrutsConstants.STRUTS_ENABLE_DYNAMIC_METHOD_INVOCATION)
public void setAllowDynamicMethodCalls(String allowDynamicMethodCalls) {
this.allowDynamicMethodCalls = "true".equalsIgnoreCase(allowDynamicMethodCalls);
}
public ActionMapping getMapping(HttpServletRequest request, ConfigurationManager configManager) {
ActionMapping mapping = new ActionMapping();
String uri = getUri(request);
uri = dropExtension(uri, mapping);
if (uri == null) {
return null;
}
parseNameAndNamespace(uri, mapping, configManager);
handleSpecialParameters(request, mapping);
if (mapping.getName() == null) {
return null;
}
// handle "name!method" convention.
handleDynamicMethodInvocation(mapping, mapping.getName());
String fullName = mapping.getName();
// Only try something if the action name is specified
if (fullName != null && fullName.length() > 0) {
// cut off any ;jsessionid= type appendix but allow the rails-like ;edit
int scPos = fullName.indexOf(';');
if (scPos > -1 && !"edit".equals(fullName.substring(scPos + 1))) {
fullName = fullName.substring(0, scPos);
}
int lastSlashPos = fullName.lastIndexOf('/');
String id = null;
if (lastSlashPos > -1) {
// fun trickery to parse 'actionName/id/methodName' in the case of 'animals/dog/edit'
int prevSlashPos = fullName.lastIndexOf('/', lastSlashPos - 1);
if (prevSlashPos > -1) {
mapping.setMethod(fullName.substring(lastSlashPos + 1));
fullName = fullName.substring(0, lastSlashPos);
lastSlashPos = prevSlashPos;
}
id = fullName.substring(lastSlashPos + 1);
}
// If a method hasn't been explicitly named, try to guess using ReST-style patterns
if (mapping.getMethod() == null) {
// Handle uris with no id, possibly ending in '/'
if (lastSlashPos == -1 || lastSlashPos == fullName.length() - 1) {
// Index e.g. foo
if (isGet(request)) {
mapping.setMethod(indexMethodName);
// Creating a new entry on POST e.g. foo
} else if (isPost(request)) {
mapping.setMethod(postMethodName);
}
// Handle uris with an id at the end
} else if (id != null) {
// Viewing the form to edit an item e.g. foo/1;edit
if (isGet(request) && id.endsWith(";edit")) {
id = id.substring(0, id.length() - ";edit".length());
mapping.setMethod(editMethodName);
// Viewing the form to create a new item e.g. foo/new
} else if (isGet(request) && "new".equals(id)) {
mapping.setMethod(newMethodName);
// Removing an item e.g. foo/1
} else if (isDelete(request)) {
mapping.setMethod(deleteMethodName);
// Viewing an item e.g. foo/1
} else if (isGet(request)) {
mapping.setMethod(getMethodName);
// Updating an item e.g. foo/1
} else if (isPut(request)) {
mapping.setMethod(putMethodName);
}
}
}
// cut off the id parameter, even if a method is specified
if (id != null) {
if (!"new".equals(id)) {
if (mapping.getParams() == null) {
mapping.setParams(new HashMap());
}
mapping.getParams().put(idParameterName, new String[]{id});
}
fullName = fullName.substring(0, lastSlashPos);
}
mapping.setName(fullName);
}
return mapping;
}
private void handleDynamicMethodInvocation(ActionMapping mapping, String name) {
int exclamation = name.lastIndexOf("!");
if (exclamation != -1) {
mapping.setName(name.substring(0, exclamation));
if (allowDynamicMethodCalls) {
mapping.setMethod(name.substring(exclamation + 1));
} else {
mapping.setMethod(null);
}
}
}
/**
* Parses the name and namespace from the uri. Uses the configured package
* namespaces to determine the name and id parameter, to be parsed later.
*
* @param uri The uri
* @param mapping The action mapping to populate
*/
protected void parseNameAndNamespace(String uri, ActionMapping mapping,
ConfigurationManager configManager) {
String namespace, name;
int lastSlash = uri.lastIndexOf("/");
if (lastSlash == -1) {
namespace = "";
name = uri;
} else if (lastSlash == 0) {
// ww-1046, assume it is the root namespace, it will fallback to
// default
// namespace anyway if not found in root namespace.
namespace = "/";
name = uri.substring(lastSlash + 1);
} else {
// Try to find the namespace in those defined, defaulting to ""
Configuration config = configManager.getConfiguration();
String prefix = uri.substring(0, lastSlash);
namespace = "";
// Find the longest matching namespace, defaulting to the default
for (Iterator i = config.getPackageConfigs().values().iterator(); i
.hasNext();) {
String ns = ((PackageConfig) i.next()).getNamespace();
if (ns != null && prefix.startsWith(ns) && (prefix.length() == ns.length() || prefix.charAt(ns.length()) == '/')) {
if (ns.length() > namespace.length()) {
namespace = ns;
}
}
}
name = uri.substring(namespace.length() + 1);
}
mapping.setNamespace(namespace);
mapping.setName(name);
}
protected boolean isGet(HttpServletRequest request) {
return "get".equalsIgnoreCase(request.getMethod());
}
protected boolean isPost(HttpServletRequest request) {
return "post".equalsIgnoreCase(request.getMethod());
}
protected boolean isPut(HttpServletRequest request) {
if ("put".equalsIgnoreCase(request.getMethod())) {
return true;
} else {
return isPost(request) && "put".equalsIgnoreCase(request.getParameter(HTTP_METHOD_PARAM));
}
}
protected boolean isDelete(HttpServletRequest request) {
if ("delete".equalsIgnoreCase(request.getMethod())) {
return true;
} else {
return "delete".equalsIgnoreCase(request.getParameter(HTTP_METHOD_PARAM));
}
}
}