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org.apache.jasper.runtime.JspRuntimeLibrary Maven / Gradle / Ivy
/*
* 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.jasper.runtime;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Enumeration;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.BodyContent;
import org.apache.jasper.Constants;
import org.apache.jasper.JasperException;
import org.apache.jasper.compiler.Localizer;
/**
* Bunch of util methods that are used by code generated for useBean,
* getProperty and setProperty.
*
* The __begin, __end stuff is there so that the JSP engine can
* actually parse this file and inline them if people don't want
* runtime dependencies on this class. However, I'm not sure if that
* works so well right now. It got forgotten at some point. -akv
*
* @author Mandar Raje
* @author Shawn Bayern
*/
public class JspRuntimeLibrary {
protected static class PrivilegedIntrospectHelper
implements PrivilegedExceptionAction {
private Object bean;
private String prop;
private String value;
private ServletRequest request;
private String param;
private boolean ignoreMethodNF;
PrivilegedIntrospectHelper(Object bean, String prop,
String value, ServletRequest request,
String param, boolean ignoreMethodNF)
{
this.bean = bean;
this.prop = prop;
this.value = value;
this.request = request;
this.param = param;
this.ignoreMethodNF = ignoreMethodNF;
}
@Override
public Void run() throws JasperException {
internalIntrospecthelper(
bean,prop,value,request,param,ignoreMethodNF);
return null;
}
}
/**
* Returns the value of the javax.servlet.error.exception request
* attribute value, if present, otherwise the value of the
* javax.servlet.jsp.jspException request attribute value.
*
* This method is called at the beginning of the generated servlet code
* for a JSP error page, when the "exception" implicit scripting language
* variable is initialized.
*/
public static Throwable getThrowable(ServletRequest request) {
Throwable error = (Throwable) request.getAttribute(
RequestDispatcher.ERROR_EXCEPTION);
if (error == null) {
error = (Throwable) request.getAttribute(PageContext.EXCEPTION);
if (error != null) {
/*
* The only place that sets JSP_EXCEPTION is
* PageContextImpl.handlePageException(). It really should set
* SERVLET_EXCEPTION, but that would interfere with the
* ErrorReportValve. Therefore, if JSP_EXCEPTION is set, we
* need to set SERVLET_EXCEPTION.
*/
request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, error);
}
}
return error;
}
public static boolean coerceToBoolean(String s) {
if (s == null || s.length() == 0)
return false;
else
return Boolean.parseBoolean(s);
}
public static byte coerceToByte(String s) {
if (s == null || s.length() == 0)
return (byte) 0;
else
return Byte.parseByte(s);
}
public static char coerceToChar(String s) {
if (s == null || s.length() == 0) {
return (char) 0;
} else {
// this trick avoids escaping issues
return (char)(int) s.charAt(0);
}
}
public static double coerceToDouble(String s) {
if (s == null || s.length() == 0)
return 0;
else
return Double.parseDouble(s);
}
public static float coerceToFloat(String s) {
if (s == null || s.length() == 0)
return 0;
else
return Float.parseFloat(s);
}
public static int coerceToInt(String s) {
if (s == null || s.length() == 0)
return 0;
else
return Integer.parseInt(s);
}
public static short coerceToShort(String s) {
if (s == null || s.length() == 0)
return (short) 0;
else
return Short.parseShort(s);
}
public static long coerceToLong(String s) {
if (s == null || s.length() == 0)
return 0;
else
return Long.parseLong(s);
}
public static Object coerce(String s, Class target) {
boolean isNullOrEmpty = (s == null || s.length() == 0);
if (target == Boolean.class) {
if (isNullOrEmpty) {
s = "false";
}
return Boolean.valueOf(s);
} else if (target == Byte.class) {
if (isNullOrEmpty)
return Byte.valueOf((byte) 0);
else
return Byte.valueOf(s);
} else if (target == Character.class) {
if (isNullOrEmpty)
return Character.valueOf((char) 0);
else
return Character.valueOf(s.charAt(0));
} else if (target == Double.class) {
if (isNullOrEmpty)
return Double.valueOf(0);
else
return Double.valueOf(s);
} else if (target == Float.class) {
if (isNullOrEmpty)
return Float.valueOf(0);
else
return Float.valueOf(s);
} else if (target == Integer.class) {
if (isNullOrEmpty)
return Integer.valueOf(0);
else
return Integer.valueOf(s);
} else if (target == Short.class) {
if (isNullOrEmpty)
return Short.valueOf((short) 0);
else
return Short.valueOf(s);
} else if (target == Long.class) {
if (isNullOrEmpty)
return Long.valueOf(0);
else
return Long.valueOf(s);
} else {
return null;
}
}
// __begin convertMethod
public static Object convert(String propertyName, String s, Class t,
Class propertyEditorClass)
throws JasperException
{
try {
if (s == null) {
if (t.equals(Boolean.class) || t.equals(Boolean.TYPE))
s = "false";
else
return null;
}
if (propertyEditorClass != null) {
return getValueFromBeanInfoPropertyEditor(
t, propertyName, s, propertyEditorClass);
} else if ( t.equals(Boolean.class) || t.equals(Boolean.TYPE) ) {
if (s.equalsIgnoreCase("on") || s.equalsIgnoreCase("true"))
s = "true";
else
s = "false";
return Boolean.valueOf(s);
} else if ( t.equals(Byte.class) || t.equals(Byte.TYPE) ) {
return Byte.valueOf(s);
} else if (t.equals(Character.class) || t.equals(Character.TYPE)) {
return s.length() > 0 ? Character.valueOf(s.charAt(0)) : null;
} else if ( t.equals(Short.class) || t.equals(Short.TYPE) ) {
return Short.valueOf(s);
} else if ( t.equals(Integer.class) || t.equals(Integer.TYPE) ) {
return Integer.valueOf(s);
} else if ( t.equals(Float.class) || t.equals(Float.TYPE) ) {
return Float.valueOf(s);
} else if ( t.equals(Long.class) || t.equals(Long.TYPE) ) {
return Long.valueOf(s);
} else if ( t.equals(Double.class) || t.equals(Double.TYPE) ) {
return Double.valueOf(s);
} else if ( t.equals(String.class) ) {
return s;
} else if ( t.equals(java.io.File.class) ) {
return new java.io.File(s);
} else if (t.getName().equals("java.lang.Object")) {
return new Object[] {s};
} else {
return getValueFromPropertyEditorManager(
t, propertyName, s);
}
} catch (Exception ex) {
throw new JasperException(ex);
}
}
// __end convertMethod
// __begin introspectMethod
public static void introspect(Object bean, ServletRequest request)
throws JasperException
{
Enumeration e = request.getParameterNames();
while ( e.hasMoreElements() ) {
String name = e.nextElement();
String value = request.getParameter(name);
introspecthelper(bean, name, value, request, name, true);
}
}
// __end introspectMethod
// __begin introspecthelperMethod
public static void introspecthelper(Object bean, String prop,
String value, ServletRequest request,
String param, boolean ignoreMethodNF)
throws JasperException
{
if( Constants.IS_SECURITY_ENABLED ) {
try {
PrivilegedIntrospectHelper dp =
new PrivilegedIntrospectHelper(
bean,prop,value,request,param,ignoreMethodNF);
AccessController.doPrivileged(dp);
} catch( PrivilegedActionException pe) {
Exception e = pe.getException();
throw (JasperException)e;
}
} else {
internalIntrospecthelper(
bean,prop,value,request,param,ignoreMethodNF);
}
}
private static void internalIntrospecthelper(Object bean, String prop,
String value, ServletRequest request,
String param, boolean ignoreMethodNF)
throws JasperException
{
Method method = null;
Class type = null;
Class propertyEditorClass = null;
try {
java.beans.BeanInfo info
= java.beans.Introspector.getBeanInfo(bean.getClass());
if ( info != null ) {
java.beans.PropertyDescriptor pd[]
= info.getPropertyDescriptors();
for (int i = 0 ; i < pd.length ; i++) {
if ( pd[i].getName().equals(prop) ) {
method = pd[i].getWriteMethod();
type = pd[i].getPropertyType();
propertyEditorClass = pd[i].getPropertyEditorClass();
break;
}
}
}
if ( method != null ) {
if (type.isArray()) {
if (request == null) {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.setproperty.noindexset"));
}
Class t = type.getComponentType();
String[] values = request.getParameterValues(param);
//XXX Please check.
if(values == null) return;
if(t.equals(String.class)) {
method.invoke(bean, new Object[] { values });
} else {
createTypedArray (prop, bean, method, values, t,
propertyEditorClass);
}
} else {
if(value == null || (param != null && value.equals(""))) return;
Object oval = convert(prop, value, type, propertyEditorClass);
if ( oval != null )
method.invoke(bean, new Object[] { oval });
}
}
} catch (Exception ex) {
throw new JasperException(ex);
}
if (!ignoreMethodNF && (method == null)) {
if (type == null) {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.noproperty",
prop,
bean.getClass().getName()));
} else {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.nomethod.setproperty",
prop,
type.getName(),
bean.getClass().getName()));
}
}
}
// __end introspecthelperMethod
//-------------------------------------------------------------------
// functions to convert builtin Java data types to string.
//-------------------------------------------------------------------
// __begin toStringMethod
public static String toString(Object o) {
return String.valueOf(o);
}
public static String toString(byte b) {
return Byte.toString(b);
}
public static String toString(boolean b) {
return Boolean.toString(b);
}
public static String toString(short s) {
return Short.toString(s);
}
public static String toString(int i) {
return Integer.toString(i);
}
public static String toString(float f) {
return Float.toString(f);
}
public static String toString(long l) {
return Long.toString(l);
}
public static String toString(double d) {
return Double.toString(d);
}
public static String toString(char c) {
return Character.toString(c);
}
// __end toStringMethod
/**
* Create a typed array.
* This is a special case where params are passed through
* the request and the property is indexed.
*/
public static void createTypedArray(String propertyName,
Object bean,
Method method,
String[] values,
Class t,
Class propertyEditorClass)
throws JasperException {
try {
if (propertyEditorClass != null) {
Object[] tmpval = new Integer[values.length];
for (int i=0; i^()[]{}$\\\n";
for(int index=0; index with EL expression for 'value' attribute
/** Use proprietaryEvaluate
public static void handleSetPropertyExpression(Object bean,
String prop, String expression, PageContext pageContext,
VariableResolver variableResolver, FunctionMapper functionMapper )
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] {
pageContext.getExpressionEvaluator().evaluate(
expression,
method.getParameterTypes()[0],
variableResolver,
functionMapper,
null )
});
} catch (Exception ex) {
throw new JasperException(ex);
}
}
**/
public static void handleSetPropertyExpression(Object bean,
String prop, String expression, PageContext pageContext,
ProtectedFunctionMapper functionMapper )
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] {
PageContextImpl.proprietaryEvaluate(
expression,
method.getParameterTypes()[0],
pageContext,
functionMapper,
false )
});
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
Object value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { value });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
int value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Integer.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
short value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Short.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
long value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Long.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
double value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Double.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
float value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Float.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
char value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Character.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
byte value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Byte.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static void handleSetProperty(Object bean, String prop,
boolean value)
throws JasperException
{
try {
Method method = getWriteMethod(bean.getClass(), prop);
method.invoke(bean, new Object[] { Boolean.valueOf(value) });
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public static Method getWriteMethod(Class beanClass, String prop)
throws JasperException {
Method method = null;
Class type = null;
try {
java.beans.BeanInfo info
= java.beans.Introspector.getBeanInfo(beanClass);
if ( info != null ) {
java.beans.PropertyDescriptor pd[]
= info.getPropertyDescriptors();
for (int i = 0 ; i < pd.length ; i++) {
if ( pd[i].getName().equals(prop) ) {
method = pd[i].getWriteMethod();
type = pd[i].getPropertyType();
break;
}
}
} else {
// just in case introspection silently fails.
throw new JasperException(
Localizer.getMessage("jsp.error.beans.nobeaninfo",
beanClass.getName()));
}
} catch (Exception ex) {
throw new JasperException (ex);
}
if (method == null) {
if (type == null) {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.noproperty",
prop,
beanClass.getName()));
} else {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.nomethod.setproperty",
prop,
type.getName(),
beanClass.getName()));
}
}
return method;
}
public static Method getReadMethod(Class beanClass, String prop)
throws JasperException {
Method method = null;
Class type = null;
try {
java.beans.BeanInfo info
= java.beans.Introspector.getBeanInfo(beanClass);
if ( info != null ) {
java.beans.PropertyDescriptor pd[]
= info.getPropertyDescriptors();
for (int i = 0 ; i < pd.length ; i++) {
if ( pd[i].getName().equals(prop) ) {
method = pd[i].getReadMethod();
type = pd[i].getPropertyType();
break;
}
}
} else {
// just in case introspection silently fails.
throw new JasperException(
Localizer.getMessage("jsp.error.beans.nobeaninfo",
beanClass.getName()));
}
} catch (Exception ex) {
throw new JasperException (ex);
}
if (method == null) {
if (type == null) {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.noproperty", prop,
beanClass.getName()));
} else {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.nomethod", prop,
beanClass.getName()));
}
}
return method;
}
//*********************************************************************
// PropertyEditor Support
public static Object getValueFromBeanInfoPropertyEditor(
Class attrClass, String attrName, String attrValue,
Class propertyEditorClass)
throws JasperException
{
try {
PropertyEditor pe =
(PropertyEditor)propertyEditorClass.newInstance();
pe.setAsText(attrValue);
return pe.getValue();
} catch (Exception ex) {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.property.conversion",
attrValue, attrClass.getName(), attrName,
ex.getMessage()));
}
}
public static Object getValueFromPropertyEditorManager(
Class attrClass, String attrName, String attrValue)
throws JasperException
{
try {
PropertyEditor propEditor =
PropertyEditorManager.findEditor(attrClass);
if (propEditor != null) {
propEditor.setAsText(attrValue);
return propEditor.getValue();
} else {
throw new IllegalArgumentException(
Localizer.getMessage("jsp.error.beans.propertyeditor.notregistered"));
}
} catch (IllegalArgumentException ex) {
throw new JasperException(
Localizer.getMessage("jsp.error.beans.property.conversion",
attrValue, attrClass.getName(), attrName,
ex.getMessage()));
}
}
// ************************************************************************
// General Purpose Runtime Methods
// ************************************************************************
/**
* Convert a possibly relative resource path into a context-relative
* resource path that starts with a '/'.
*
* @param request The servlet request we are processing
* @param relativePath The possibly relative resource path
*/
public static String getContextRelativePath(ServletRequest request,
String relativePath) {
if (relativePath.startsWith("/"))
return (relativePath);
if (!(request instanceof HttpServletRequest))
return (relativePath);
HttpServletRequest hrequest = (HttpServletRequest) request;
String uri = (String) request.getAttribute(
RequestDispatcher.INCLUDE_SERVLET_PATH);
if (uri != null) {
String pathInfo = (String)
request.getAttribute(RequestDispatcher.INCLUDE_PATH_INFO);
if (pathInfo == null) {
if (uri.lastIndexOf('/') >= 0)
uri = uri.substring(0, uri.lastIndexOf('/'));
}
}
else {
uri = hrequest.getServletPath();
if (uri.lastIndexOf('/') >= 0)
uri = uri.substring(0, uri.lastIndexOf('/'));
}
return uri + '/' + relativePath;
}
/**
* Perform a RequestDispatcher.include() operation, with optional flushing
* of the response beforehand.
*
* @param request The servlet request we are processing
* @param response The servlet response we are processing
* @param relativePath The relative path of the resource to be included
* @param out The Writer to whom we are currently writing
* @param flush Should we flush before the include is processed?
*
* @exception IOException if thrown by the included servlet
* @exception ServletException if thrown by the included servlet
*/
public static void include(ServletRequest request,
ServletResponse response,
String relativePath,
JspWriter out,
boolean flush)
throws IOException, ServletException {
if (flush && !(out instanceof BodyContent))
out.flush();
// FIXME - It is tempting to use request.getRequestDispatcher() to
// resolve a relative path directly, but Catalina currently does not
// take into account whether the caller is inside a RequestDispatcher
// include or not. Whether Catalina *should* take that into account
// is a spec issue currently under review. In the mean time,
// replicate Jasper's previous behavior
String resourcePath = getContextRelativePath(request, relativePath);
RequestDispatcher rd = request.getRequestDispatcher(resourcePath);
rd.include(request,
new ServletResponseWrapperInclude(response, out));
}
/**
* URL encodes a string, based on the supplied character encoding.
* This performs the same function as java.next.URLEncode.encode
* in J2SDK1.4, and should be removed if the only platform supported
* is 1.4 or higher.
* @param s The String to be URL encoded.
* @param enc The character encoding
* @return The URL encoded String
*/
public static String URLEncode(String s, String enc) {
if (s == null) {
return "null";
}
if (enc == null) {
enc = "ISO-8859-1"; // The default request encoding
}
StringBuilder out = new StringBuilder(s.length());
ByteArrayOutputStream buf = new ByteArrayOutputStream();
OutputStreamWriter writer = null;
try {
writer = new OutputStreamWriter(buf, enc);
} catch (java.io.UnsupportedEncodingException ex) {
// Use the default encoding?
writer = new OutputStreamWriter(buf);
}
for (int i = 0; i < s.length(); i++) {
int c = s.charAt(i);
if (c == ' ') {
out.append('+');
} else if (isSafeChar(c)) {
out.append((char)c);
} else {
// convert to external encoding before hex conversion
try {
writer.write(c);
writer.flush();
} catch(IOException e) {
buf.reset();
continue;
}
byte[] ba = buf.toByteArray();
for (int j = 0; j < ba.length; j++) {
out.append('%');
// Converting each byte in the buffer
out.append(Character.forDigit((ba[j]>>4) & 0xf, 16));
out.append(Character.forDigit(ba[j] & 0xf, 16));
}
buf.reset();
}
}
return out.toString();
}
private static boolean isSafeChar(int c) {
if (c >= 'a' && c <= 'z') {
return true;
}
if (c >= 'A' && c <= 'Z') {
return true;
}
if (c >= '0' && c <= '9') {
return true;
}
if (c == '-' || c == '_' || c == '.' || c == '!' ||
c == '~' || c == '*' || c == '\'' || c == '(' || c == ')') {
return true;
}
return false;
}
}
