package org.apache.struts.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.ActionServletWrapper;
import org.apache.struts.action.DynaActionForm;
import org.apache.struts.action.DynaActionFormClass;
import org.apache.struts.config.ActionConfig;
import org.apache.struts.config.FormBeanConfig;
import org.apache.struts.config.ForwardConfig;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.upload.MultipartRequestHandler;
import org.apache.struts.upload.MultipartRequestWrapper;

public class RequestUtils {
  protected static Log log = LogFactory.getLog(RequestUtils.class);
  
  private static MessageResources messages = MessageResources.getMessageResources("org.apache.struts.util.LocalStrings");
  
  private static final String PREFIXES_KEY = "org.apache.struts.util.PREFIXES";
  
  private static Method encode = null;
  
  private static Map scopes = new HashMap();
  
  static {
    try {
      Class[] args = { String.class, String.class };
      encode = URLEncoder.class.getMethod("encode", args);
    } catch (NoSuchMethodException e) {
      log.debug("Could not find Java 1.4 encode method.  Using deprecated version.", e);
    } 
    scopes.put("page", new Integer(1));
    scopes.put("request", new Integer(2));
    scopes.put("session", new Integer(3));
    scopes.put("application", new Integer(4));
  }
  
  public static URL absoluteURL(HttpServletRequest request, String path) throws MalformedURLException {
    return new URL(serverURL(request), request.getContextPath() + path);
  }
  
  public static Class applicationClass(String className) throws ClassNotFoundException {
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    if (classLoader == null)
      classLoader = RequestUtils.class.getClassLoader(); 
    return classLoader.loadClass(className);
  }
  
  public static Object applicationInstance(String className) throws ClassNotFoundException, IllegalAccessException, InstantiationException {
    return applicationClass(className).newInstance();
  }
  
  public static Map computeParameters(PageContext pageContext, String paramId, String paramName, String paramProperty, String paramScope, String name, String property, String scope, boolean transaction) throws JspException {
    if (paramId == null && name == null && !transaction)
      return null; 
    Map map = null;
    try {
      if (name != null)
        map = (Map)lookup(pageContext, name, property, scope); 
    } catch (ClassCastException e) {
      saveException(pageContext, e);
      throw new JspException(messages.getMessage("parameters.multi", name, property, scope));
    } catch (JspException e) {
      saveException(pageContext, (Throwable)e);
      throw e;
    } 
    Map results = null;
    if (map != null) {
      results = new HashMap(map);
    } else {
      results = new HashMap();
    } 
    if (paramId != null && paramName != null) {
      Object paramValue = null;
      try {
        paramValue = lookup(pageContext, paramName, paramProperty, paramScope);
      } catch (JspException e) {
        saveException(pageContext, (Throwable)e);
        throw e;
      } 
      if (paramValue != null) {
        String paramString = null;
        if (paramValue instanceof String) {
          paramString = (String)paramValue;
        } else {
          paramString = paramValue.toString();
        } 
        Object mapValue = results.get(paramId);
        if (mapValue == null) {
          results.put(paramId, paramString);
        } else if (mapValue instanceof String) {
          String[] newValues = new String[2];
          newValues[0] = (String)mapValue;
          newValues[1] = paramString;
          results.put(paramId, newValues);
        } else {
          String[] oldValues = (String[])mapValue;
          String[] newValues = new String[oldValues.length + 1];
          System.arraycopy(oldValues, 0, newValues, 0, oldValues.length);
          newValues[oldValues.length] = paramString;
          results.put(paramId, newValues);
        } 
      } 
    } 
    if (transaction) {
      HttpSession session = pageContext.getSession();
      String token = null;
      if (session != null)
        token = (String)session.getAttribute("org.apache.struts.action.TOKEN"); 
      if (token != null)
        results.put("org.apache.struts.taglib.html.TOKEN", token); 
    } 
    return results;
  }
  
  public static String computeURL(PageContext pageContext, String forward, String href, String page, Map params, String anchor, boolean redirect) throws MalformedURLException {
    return computeURL(pageContext, forward, href, page, null, params, anchor, redirect);
  }
  
  public static String computeURL(PageContext pageContext, String forward, String href, String page, String action, Map params, String anchor, boolean redirect) throws MalformedURLException {
    return computeURL(pageContext, forward, href, page, action, params, anchor, redirect, true);
  }
  
  public static String computeURL(PageContext pageContext, String forward, String href, String page, String action, Map params, String anchor, boolean redirect, boolean encodeSeparator) throws MalformedURLException {
    int n = 0;
    if (forward != null)
      n++; 
    if (href != null)
      n++; 
    if (page != null)
      n++; 
    if (action != null)
      n++; 
    if (n != 1)
      throw new MalformedURLException(messages.getMessage("computeURL.specifier")); 
    ModuleConfig config = (ModuleConfig)pageContext.getRequest().getAttribute("org.apache.struts.action.MODULE");
    if (config == null) {
      config = (ModuleConfig)pageContext.getServletContext().getAttribute("org.apache.struts.action.MODULE");
      pageContext.getRequest().setAttribute("org.apache.struts.action.MODULE", config);
    } 
    StringBuffer url = new StringBuffer();
    HttpServletRequest request = (HttpServletRequest)pageContext.getRequest();
    if (forward != null) {
      ForwardConfig fc = config.findForwardConfig(forward);
      if (fc == null)
        throw new MalformedURLException(messages.getMessage("computeURL.forward", forward)); 
      if (fc.getRedirect())
        redirect = true; 
      if (fc.getPath().startsWith("/")) {
        url.append(request.getContextPath());
        url.append(forwardURL(request, fc));
      } else {
        url.append(fc.getPath());
      } 
    } else if (href != null) {
      url.append(href);
    } else if (action != null) {
      url.append(getActionMappingURL(action, pageContext));
    } else {
      url.append(request.getContextPath());
      url.append(pageURL(request, page));
    } 
    if (anchor != null) {
      String temp = url.toString();
      int hash = temp.indexOf('#');
      if (hash >= 0)
        url.setLength(hash); 
      url.append('#');
      url.append(encodeURL(anchor));
    } 
    if (params != null && params.size() > 0) {
      String temp = url.toString();
      int hash = temp.indexOf('#');
      if (hash >= 0) {
        anchor = temp.substring(hash + 1);
        url.setLength(hash);
        temp = url.toString();
      } else {
        anchor = null;
      } 
      String separator = null;
      if (redirect) {
        separator = "&";
      } else if (encodeSeparator) {
        separator = "&";
      } else {
        separator = "&";
      } 
      boolean question = (temp.indexOf('?') >= 0);
      Iterator keys = params.keySet().iterator();
      while (keys.hasNext()) {
        String key = keys.next();
        Object value = params.get(key);
        if (value == null) {
          if (!question) {
            url.append('?');
            question = true;
          } else {
            url.append(separator);
          } 
          url.append(encodeURL(key));
          url.append('=');
          continue;
        } 
        if (value instanceof String) {
          if (!question) {
            url.append('?');
            question = true;
          } else {
            url.append(separator);
          } 
          url.append(encodeURL(key));
          url.append('=');
          url.append(encodeURL((String)value));
          continue;
        } 
        if (value instanceof String[]) {
          String[] values = (String[])value;
          for (int i = 0; i < values.length; i++) {
            if (!question) {
              url.append('?');
              question = true;
            } else {
              url.append(separator);
            } 
            url.append(encodeURL(key));
            url.append('=');
            url.append(encodeURL(values[i]));
          } 
          continue;
        } 
        if (!question) {
          url.append('?');
          question = true;
        } else {
          url.append(separator);
        } 
        url.append(encodeURL(key));
        url.append('=');
        url.append(encodeURL(value.toString()));
      } 
      if (anchor != null) {
        url.append('#');
        url.append(encodeURL(anchor));
      } 
    } 
    if (pageContext.getSession() != null) {
      HttpServletResponse response = (HttpServletResponse)pageContext.getResponse();
      if (redirect)
        return response.encodeRedirectURL(url.toString()); 
      return response.encodeURL(url.toString());
    } 
    return url.toString();
  }
  
  public static String getActionMappingName(String action) {
    String value = action;
    int question = action.indexOf("?");
    if (question >= 0)
      value = value.substring(0, question); 
    int slash = value.lastIndexOf("/");
    int period = value.lastIndexOf(".");
    if (period >= 0 && period > slash)
      value = value.substring(0, period); 
    if (value.startsWith("/"))
      return value; 
    return "/" + value;
  }
  
  public static String getActionMappingURL(String action, PageContext pageContext) {
    HttpServletRequest request = (HttpServletRequest)pageContext.getRequest();
    StringBuffer value = new StringBuffer(request.getContextPath());
    ModuleConfig config = (ModuleConfig)pageContext.getRequest().getAttribute("org.apache.struts.action.MODULE");
    if (config != null)
      value.append(config.getPrefix()); 
    String servletMapping = (String)pageContext.getAttribute("org.apache.struts.action.SERVLET_MAPPING", 4);
    if (servletMapping != null) {
      String queryString = null;
      int question = action.indexOf("?");
      if (question >= 0)
        queryString = action.substring(question); 
      String actionMapping = getActionMappingName(action);
      if (servletMapping.startsWith("*.")) {
        value.append(actionMapping);
        value.append(servletMapping.substring(1));
      } else if (servletMapping.endsWith("/*")) {
        value.append(servletMapping.substring(0, servletMapping.length() - 2));
        value.append(actionMapping);
      } else if (servletMapping.equals("/")) {
        value.append(actionMapping);
      } 
      if (queryString != null)
        value.append(queryString); 
    } else {
      if (!action.startsWith("/"))
        value.append("/"); 
      value.append(action);
    } 
    return value.toString();
  }
  
  public static ActionForm createActionForm(HttpServletRequest request, ActionMapping mapping, ModuleConfig moduleConfig, ActionServlet servlet) {
    String attribute = mapping.getAttribute();
    if (attribute == null)
      return null; 
    String name = mapping.getName();
    FormBeanConfig config = moduleConfig.findFormBeanConfig(name);
    if (config == null)
      return null; 
    if (log.isDebugEnabled())
      log.debug(" Looking for ActionForm bean instance in scope '" + mapping.getScope() + "' under attribute key '" + attribute + "'"); 
    ActionForm instance = null;
    HttpSession session = null;
    if ("request".equals(mapping.getScope())) {
      instance = (ActionForm)request.getAttribute(attribute);
    } else {
      session = request.getSession();
      instance = (ActionForm)session.getAttribute(attribute);
    } 
    if (instance != null)
      if (config.getDynamic()) {
        String className = ((DynaBean)instance).getDynaClass().getName();
        if (className.equals(config.getName())) {
          if (log.isDebugEnabled()) {
            log.debug(" Recycling existing DynaActionForm instance of type '" + className + "'");
            log.trace(" --> " + instance);
          } 
          return instance;
        } 
      } else {
        try {
          Class configClass = applicationClass(config.getType());
          if (configClass.isAssignableFrom(instance.getClass())) {
            if (log.isDebugEnabled()) {
              log.debug(" Recycling existing ActionForm instance of class '" + instance.getClass().getName() + "'");
              log.trace(" --> " + instance);
            } 
            return instance;
          } 
        } catch (Throwable t) {
          log.error(servlet.getInternal().getMessage("formBean", config.getType()), t);
          return null;
        } 
      }  
    if (config.getDynamic()) {
      try {
        DynaActionFormClass dynaClass = DynaActionFormClass.createDynaActionFormClass(config);
        instance = (ActionForm)dynaClass.newInstance();
        ((DynaActionForm)instance).initialize(mapping);
        if (log.isDebugEnabled()) {
          log.debug(" Creating new DynaActionForm instance of type '" + config.getType() + "'");
          log.trace(" --> " + instance);
        } 
      } catch (Throwable t) {
        log.error(servlet.getInternal().getMessage("formBean", config.getType()), t);
        return null;
      } 
    } else {
      try {
        instance = (ActionForm)applicationInstance(config.getType());
        if (log.isDebugEnabled()) {
          log.debug(" Creating new ActionForm instance of type '" + config.getType() + "'");
          log.trace(" --> " + instance);
        } 
      } catch (Throwable t) {
        log.error(servlet.getInternal().getMessage("formBean", config.getType()), t);
        return null;
      } 
    } 
    instance.setServlet(servlet);
    return instance;
  }
  
  public static Object lookup(PageContext pageContext, String name, String scopeName) throws JspException {
    if (scopeName == null)
      return pageContext.findAttribute(name); 
    try {
      return pageContext.getAttribute(name, getScope(scopeName));
    } catch (JspException e) {
      saveException(pageContext, (Throwable)e);
      throw e;
    } 
  }
  
  public static int getScope(String scopeName) throws JspException {
    Integer scope = (Integer)scopes.get(scopeName.toLowerCase());
    if (scope == null)
      throw new JspException(messages.getMessage("lookup.scope", scope)); 
    return scope.intValue();
  }
  
  public static Object lookup(PageContext pageContext, String name, String property, String scope) throws JspException {
    Object bean = lookup(pageContext, name, scope);
    if (bean == null) {
      JspException e = null;
      if (scope == null) {
        e = new JspException(messages.getMessage("lookup.bean.any", name));
      } else {
        e = new JspException(messages.getMessage("lookup.bean", name, scope));
      } 
      saveException(pageContext, (Throwable)e);
      throw e;
    } 
    if (property == null)
      return bean; 
    try {
      return PropertyUtils.getProperty(bean, property);
    } catch (IllegalAccessException e) {
      saveException(pageContext, e);
      throw new JspException(messages.getMessage("lookup.access", property, name));
    } catch (InvocationTargetException e) {
      Throwable t = e.getTargetException();
      if (t == null)
        t = e; 
      saveException(pageContext, t);
      throw new JspException(messages.getMessage("lookup.target", property, name));
    } catch (NoSuchMethodException e) {
      saveException(pageContext, e);
      throw new JspException(messages.getMessage("lookup.method", property, name));
    } 
  }
  
  public static Locale retrieveUserLocale(PageContext pageContext, String locale) {
    Locale userLocale = null;
    HttpSession session = pageContext.getSession();
    if (locale == null)
      locale = "org.apache.struts.action.LOCALE"; 
    if (session != null)
      userLocale = (Locale)session.getAttribute(locale); 
    if (userLocale == null)
      userLocale = pageContext.getRequest().getLocale(); 
    return userLocale;
  }
  
  public static String message(PageContext pageContext, String bundle, String locale, String key) throws JspException {
    return message(pageContext, bundle, locale, key, null);
  }
  
  public static String message(PageContext pageContext, String bundle, String locale, String key, Object[] args) throws JspException {
    MessageResources resources = retrieveMessageResources(pageContext, bundle, false);
    Locale userLocale = retrieveUserLocale(pageContext, locale);
    if (args == null)
      return resources.getMessage(userLocale, key); 
    return resources.getMessage(userLocale, key, args);
  }
  
  private static MessageResources retrieveMessageResources(PageContext pageContext, String bundle, boolean checkPageScope) throws JspException {
    MessageResources resources = null;
    if (bundle == null)
      bundle = "org.apache.struts.action.MESSAGE"; 
    if (checkPageScope)
      resources = (MessageResources)pageContext.getAttribute(bundle, 1); 
    if (resources == null)
      resources = (MessageResources)pageContext.getAttribute(bundle, 2); 
    if (resources == null)
      resources = (MessageResources)pageContext.getAttribute(bundle, 4); 
    if (resources == null) {
      JspException e = new JspException(messages.getMessage("message.bundle", bundle));
      saveException(pageContext, (Throwable)e);
      throw e;
    } 
    return resources;
  }
  
  public static void populate(Object bean, HttpServletRequest request) throws ServletException {
    populate(bean, null, null, request);
  }
  
  public static void populate(Object bean, String prefix, String suffix, HttpServletRequest request) throws ServletException {
    HashMap properties = new HashMap();
    Enumeration names = null;
    Map multipartParameters = null;
    String contentType = request.getContentType();
    String method = request.getMethod();
    boolean isMultipart = false;
    if (contentType != null && contentType.startsWith("multipart/form-data") && method.equalsIgnoreCase("POST")) {
      ActionServletWrapper servlet;
      if (bean instanceof ActionForm) {
        servlet = ((ActionForm)bean).getServletWrapper();
      } else {
        throw new ServletException("bean that's supposed to be populated from a multipart request is not of type \"org.apache.struts.action.ActionForm\", but type \"" + bean.getClass().getName() + "\"");
      } 
      MultipartRequestHandler multipartHandler = getMultipartHandler(request);
      ((ActionForm)bean).setMultipartRequestHandler(multipartHandler);
      if (multipartHandler != null) {
        isMultipart = true;
        servlet.setServletFor(multipartHandler);
        multipartHandler.setMapping((ActionMapping)request.getAttribute("org.apache.struts.action.mapping.instance"));
        multipartHandler.handleRequest(request);
        Boolean maxLengthExceeded = (Boolean)request.getAttribute("org.apache.struts.upload.MaxLengthExceeded");
        if (maxLengthExceeded != null && maxLengthExceeded.booleanValue())
          return; 
        multipartParameters = getAllParametersForMultipartRequest(request, multipartHandler);
        names = Collections.enumeration(multipartParameters.keySet());
      } 
    } 
    if (!isMultipart)
      names = request.getParameterNames(); 
    while (names.hasMoreElements()) {
      String name = (String)names.nextElement();
      String stripped = name;
      if (prefix != null) {
        if (!stripped.startsWith(prefix))
          continue; 
        stripped = stripped.substring(prefix.length());
      } 
      if (suffix != null) {
        if (!stripped.endsWith(suffix))
          continue; 
        stripped = stripped.substring(0, stripped.length() - suffix.length());
      } 
      if (isMultipart) {
        properties.put(stripped, multipartParameters.get(name));
        continue;
      } 
      properties.put(stripped, request.getParameterValues(name));
    } 
    try {
      BeanUtils.populate(bean, properties);
    } catch (Exception e) {
      throw new ServletException("BeanUtils.populate", e);
    } 
  }
  
  private static MultipartRequestHandler getMultipartHandler(HttpServletRequest request) throws ServletException {
    MultipartRequestHandler multipartHandler = null;
    String multipartClass = (String)request.getAttribute("org.apache.struts.action.mapping.multipartclass");
    request.removeAttribute("org.apache.struts.action.mapping.multipartclass");
    if (multipartClass != null) {
      try {
        multipartHandler = (MultipartRequestHandler)applicationInstance(multipartClass);
      } catch (ClassNotFoundException cnfe) {
        log.error("MultipartRequestHandler class \"" + multipartClass + "\" in mapping class not found, " + "defaulting to global multipart class");
      } catch (InstantiationException ie) {
        log.error("InstantiaionException when instantiating MultipartRequestHandler \"" + multipartClass + "\", " + "defaulting to global multipart class, exception: " + ie.getMessage());
      } catch (IllegalAccessException iae) {
        log.error("IllegalAccessException when instantiating MultipartRequestHandler \"" + multipartClass + "\", " + "defaulting to global multipart class, exception: " + iae.getMessage());
      } 
      if (multipartHandler != null)
        return multipartHandler; 
    } 
    ModuleConfig moduleConfig = (ModuleConfig)request.getAttribute("org.apache.struts.action.MODULE");
    multipartClass = moduleConfig.getControllerConfig().getMultipartClass();
    if (multipartClass != null) {
      try {
        multipartHandler = (MultipartRequestHandler)applicationInstance(multipartClass);
      } catch (ClassNotFoundException cnfe) {
        throw new ServletException("Cannot find multipart class \"" + multipartClass + "\"" + ", exception: " + cnfe.getMessage());
      } catch (InstantiationException ie) {
        throw new ServletException("InstantiaionException when instantiating multipart class \"" + multipartClass + "\", exception: " + ie.getMessage());
      } catch (IllegalAccessException iae) {
        throw new ServletException("IllegalAccessException when instantiating multipart class \"" + multipartClass + "\", exception: " + iae.getMessage());
      } 
      if (multipartHandler != null)
        return multipartHandler; 
    } 
    return multipartHandler;
  }
  
  private static Map getAllParametersForMultipartRequest(HttpServletRequest request, MultipartRequestHandler multipartHandler) {
    Map parameters = new HashMap();
    Hashtable elements = multipartHandler.getAllElements();
    Enumeration enum = elements.keys();
    while (enum.hasMoreElements()) {
      String key = enum.nextElement();
      parameters.put(key, elements.get(key));
    } 
    if (request instanceof MultipartRequestWrapper) {
      request = ((MultipartRequestWrapper)request).getRequest();
      enum = request.getParameterNames();
      while (enum.hasMoreElements()) {
        String key = enum.nextElement();
        parameters.put(key, request.getParameterValues(key));
      } 
    } else {
      log.debug("Gathering multipart parameters for unwrapped request");
    } 
    return parameters;
  }
  
  public static boolean present(PageContext pageContext, String bundle, String locale, String key) throws JspException {
    MessageResources resources = retrieveMessageResources(pageContext, bundle, true);
    Locale userLocale = retrieveUserLocale(pageContext, locale);
    return resources.isPresent(userLocale, key);
  }
  
  public static String printableURL(URL url) {
    if (url.getHost() != null)
      return url.toString(); 
    String file = url.getFile();
    String ref = url.getRef();
    if (ref == null)
      return file; 
    StringBuffer sb = new StringBuffer(file);
    sb.append('#');
    sb.append(ref);
    return sb.toString();
  }
  
  public static String actionURL(HttpServletRequest request, ActionConfig action, String pattern) {
    StringBuffer sb = new StringBuffer();
    if (pattern.endsWith("/*")) {
      sb.append(pattern.substring(0, pattern.length() - 2));
      sb.append(action.getPath());
    } else if (pattern.startsWith("*.")) {
      ModuleConfig appConfig = (ModuleConfig)request.getAttribute("org.apache.struts.action.MODULE");
      sb.append(appConfig.getPrefix());
      sb.append(action.getPath());
      sb.append(pattern.substring(1));
    } else {
      throw new IllegalArgumentException(pattern);
    } 
    return sb.toString();
  }
  
  public static String forwardURL(HttpServletRequest request, ForwardConfig forward) {
    String path = forward.getPath();
    StringBuffer sb = new StringBuffer();
    if (forward.getContextRelative()) {
      if (!path.startsWith("/"))
        sb.append("/"); 
      sb.append(path);
      return sb.toString();
    } 
    ModuleConfig moduleConfig = (ModuleConfig)request.getAttribute("org.apache.struts.action.MODULE");
    String forwardPattern = moduleConfig.getControllerConfig().getForwardPattern();
    if (forwardPattern == null) {
      sb.append(moduleConfig.getPrefix());
      if (!path.startsWith("/"))
        sb.append("/"); 
      sb.append(path);
    } else {
      boolean dollar = false;
      for (int i = 0; i < forwardPattern.length(); i++) {
        char ch = forwardPattern.charAt(i);
        if (dollar) {
          switch (ch) {
            case 'M':
              sb.append(moduleConfig.getPrefix());
              break;
            case 'P':
              if (!path.startsWith("/"))
                sb.append("/"); 
              sb.append(path);
              break;
            case '$':
              sb.append('$');
              break;
          } 
          dollar = false;
        } else if (ch == '$') {
          dollar = true;
        } else {
          sb.append(ch);
        } 
      } 
    } 
    return sb.toString();
  }
  
  public static String pageURL(HttpServletRequest request, String page) {
    StringBuffer sb = new StringBuffer();
    ModuleConfig moduleConfig = (ModuleConfig)request.getAttribute("org.apache.struts.action.MODULE");
    String pagePattern = moduleConfig.getControllerConfig().getPagePattern();
    if (pagePattern == null) {
      sb.append(moduleConfig.getPrefix());
      sb.append(page);
    } else {
      boolean dollar = false;
      for (int i = 0; i < pagePattern.length(); i++) {
        char ch = pagePattern.charAt(i);
        if (dollar) {
          switch (ch) {
            case 'M':
              sb.append(moduleConfig.getPrefix());
              break;
            case 'P':
              sb.append(page);
              break;
            case '$':
              sb.append('$');
              break;
          } 
          dollar = false;
        } else if (ch == '$') {
          dollar = true;
        } else {
          sb.append(ch);
        } 
      } 
    } 
    return sb.toString();
  }
  
  public static URL requestURL(HttpServletRequest request) throws MalformedURLException {
    StringBuffer url = new StringBuffer();
    String scheme = request.getScheme();
    int port = request.getServerPort();
    if (port < 0)
      port = 80; 
    url.append(scheme);
    url.append("://");
    url.append(request.getServerName());
    if ((scheme.equals("http") && port != 80) || (scheme.equals("https") && port != 443)) {
      url.append(':');
      url.append(port);
    } 
    url.append(request.getRequestURI());
    return new URL(url.toString());
  }
  
  public static URL serverURL(HttpServletRequest request) throws MalformedURLException {
    StringBuffer url = new StringBuffer();
    String scheme = request.getScheme();
    int port = request.getServerPort();
    if (port < 0)
      port = 80; 
    url.append(scheme);
    url.append("://");
    url.append(request.getServerName());
    if ((scheme.equals("http") && port != 80) || (scheme.equals("https") && port != 443)) {
      url.append(':');
      url.append(port);
    } 
    return new URL(url.toString());
  }
  
  public static void saveException(PageContext pageContext, Throwable exception) {
    pageContext.setAttribute("org.apache.struts.action.EXCEPTION", exception, 2);
  }
  
  public static void selectApplication(String prefix, HttpServletRequest request, ServletContext context) {
    selectModule(prefix, request, context);
  }
  
  public static void selectModule(String prefix, HttpServletRequest request, ServletContext context) {
    ModuleConfig config = (ModuleConfig)context.getAttribute("org.apache.struts.action.MODULE" + prefix);
    if (config != null) {
      request.setAttribute("org.apache.struts.action.MODULE", config);
    } else {
      request.removeAttribute("org.apache.struts.action.MODULE");
    } 
    MessageResources resources = (MessageResources)context.getAttribute("org.apache.struts.action.MESSAGE" + prefix);
    if (resources != null) {
      request.setAttribute("org.apache.struts.action.MESSAGE", resources);
    } else {
      request.removeAttribute("org.apache.struts.action.MESSAGE");
    } 
  }
  
  public static void selectApplication(HttpServletRequest request, ServletContext context) {
    selectModule(request, context);
  }
  
  public static void selectModule(HttpServletRequest request, ServletContext context) {
    String prefix = getModuleName(request, context);
    selectModule(prefix, request, context);
  }
  
  public static String getModuleName(HttpServletRequest request, ServletContext context) {
    String matchPath = (String)request.getAttribute("javax.servlet.include.servlet_path");
    if (matchPath == null)
      matchPath = request.getServletPath(); 
    return getModuleName(matchPath, context);
  }
  
  public static String getModuleName(String matchPath, ServletContext context) {
    if (log.isDebugEnabled())
      log.debug("Get module name for path " + matchPath); 
    String prefix = "";
    String[] prefixes = getModulePrefixes(context);
    int lastSlash = 0;
    while (prefix.equals("") && (lastSlash = matchPath.lastIndexOf("/")) > 0) {
      matchPath = matchPath.substring(0, lastSlash);
      for (int i = 0; i < prefixes.length; i++) {
        if (matchPath.equals(prefixes[i])) {
          prefix = prefixes[i];
          break;
        } 
      } 
    } 
    if (log.isDebugEnabled())
      log.debug("Module name found: " + (prefix.equals("") ? "default" : prefix)); 
    return prefix;
  }
  
  public static ModuleConfig getRequestModuleConfig(HttpServletRequest request) {
    return (ModuleConfig)request.getAttribute("org.apache.struts.action.MODULE");
  }
  
  public static ModuleConfig getModuleConfig(HttpServletRequest request, ServletContext context) {
    ModuleConfig moduleConfig = (ModuleConfig)request.getAttribute("org.apache.struts.action.MODULE");
    if (moduleConfig == null)
      moduleConfig = (ModuleConfig)context.getAttribute("org.apache.struts.action.MODULE"); 
    return moduleConfig;
  }
  
  public static ModuleConfig getModuleConfig(PageContext pageContext) {
    return getModuleConfig((HttpServletRequest)pageContext.getRequest(), pageContext.getServletContext());
  }
  
  public static String[] getApplicationPrefixes(ServletContext context) {
    return getModulePrefixes(context);
  }
  
  public static synchronized String[] getModulePrefixes(ServletContext context) {
    String[] prefixes = (String[])context.getAttribute("org.apache.struts.util.PREFIXES");
    if (prefixes != null)
      return prefixes; 
    ArrayList list = new ArrayList();
    Enumeration names = context.getAttributeNames();
    while (names.hasMoreElements()) {
      String name = names.nextElement();
      if (!name.startsWith("org.apache.struts.action.MODULE"))
        continue; 
      String prefix = name.substring("org.apache.struts.action.MODULE".length());
      if (prefix.length() > 0)
        list.add(prefix); 
    } 
    prefixes = list.<String>toArray(new String[list.size()]);
    context.setAttribute("org.apache.struts.util.PREFIXES", prefixes);
    return prefixes;
  }
  
  public static ActionMessages getActionMessages(PageContext pageContext, String paramName) throws JspException {
    ActionMessages am = new ActionMessages();
    Object value = pageContext.findAttribute(paramName);
    try {
      if (value != null)
        if (value instanceof String) {
          am.add("org.apache.struts.action.GLOBAL_MESSAGE", new ActionMessage((String)value));
        } else if (value instanceof String[]) {
          String[] keys = (String[])value;
          for (int i = 0; i < keys.length; i++)
            am.add("org.apache.struts.action.GLOBAL_MESSAGE", new ActionMessage(keys[i])); 
        } else if (value instanceof ErrorMessages) {
          String[] keys = ((ErrorMessages)value).getErrors();
          if (keys == null)
            keys = new String[0]; 
          for (int i = 0; i < keys.length; i++)
            am.add("org.apache.struts.action.GLOBAL_ERROR", (ActionMessage)new ActionError(keys[i])); 
        } else if (value instanceof ActionMessages) {
          am = (ActionMessages)value;
        } else {
          throw new JspException(messages.getMessage("actionMessages.errors", value.getClass().getName()));
        }  
    } catch (JspException e) {
      throw e;
    } catch (Exception e) {}
    return am;
  }
  
  public static ActionErrors getActionErrors(PageContext pageContext, String paramName) throws JspException {
    ActionErrors errors = new ActionErrors();
    Object value = pageContext.findAttribute(paramName);
    try {
      if (value != null)
        if (value instanceof String) {
          errors.add("org.apache.struts.action.GLOBAL_ERROR", new ActionError((String)value));
        } else if (value instanceof String[]) {
          String[] keys = (String[])value;
          for (int i = 0; i < keys.length; i++)
            errors.add("org.apache.struts.action.GLOBAL_ERROR", new ActionError(keys[i])); 
        } else if (value instanceof ErrorMessages) {
          String[] keys = ((ErrorMessages)value).getErrors();
          if (keys == null)
            keys = new String[0]; 
          for (int i = 0; i < keys.length; i++)
            errors.add("org.apache.struts.action.GLOBAL_ERROR", new ActionError(keys[i])); 
        } else if (value instanceof ActionErrors) {
          errors = (ActionErrors)value;
        } else {
          throw new JspException(messages.getMessage("actionErrors.errors", value.getClass().getName()));
        }  
    } catch (JspException e) {
      throw e;
    } catch (Exception e) {
      log.debug(e, e);
    } 
    return errors;
  }
  
  public static String encodeURL(String url) {
    try {
      if (encode != null)
        return (String)encode.invoke(null, new Object[] { url, "UTF-8" }); 
    } catch (IllegalAccessException e) {
      log.debug("Could not find Java 1.4 encode method.  Using deprecated version.", e);
    } catch (InvocationTargetException e) {
      log.debug("Could not find Java 1.4 encode method. Using deprecated version.", e);
    } 
    return URLEncoder.encode(url);
  }
  
  public static boolean isXhtml(PageContext pageContext) {
    String xhtml = (String)pageContext.getAttribute("org.apache.struts.globals.XHTML", 1);
    return "true".equalsIgnoreCase(xhtml);
  }
}