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A headless browser intended for use in testing web-based applications.
/*
* Copyright (c) 2002-2021 Gargoyle Software Inc.
*
* 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
* https://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 com.gargoylesoftware.htmlunit.javascript;
import static com.gargoylesoftware.htmlunit.BrowserVersionFeatures.HTMLIMAGE_HTMLELEMENT;
import static com.gargoylesoftware.htmlunit.BrowserVersionFeatures.HTMLIMAGE_HTMLUNKNOWNELEMENT;
import java.util.Deque;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.SgmlPage;
import com.gargoylesoftware.htmlunit.WebAssert;
import com.gargoylesoftware.htmlunit.WebWindow;
import com.gargoylesoftware.htmlunit.html.DomNode;
import com.gargoylesoftware.htmlunit.html.HtmlImage;
import com.gargoylesoftware.htmlunit.javascript.host.Window;
import com.gargoylesoftware.htmlunit.javascript.host.html.HTMLElement;
import com.gargoylesoftware.htmlunit.javascript.host.html.HTMLUnknownElement;
import net.sourceforge.htmlunit.corejs.javascript.Context;
import net.sourceforge.htmlunit.corejs.javascript.Scriptable;
import net.sourceforge.htmlunit.corejs.javascript.ScriptableObject;
import net.sourceforge.htmlunit.corejs.javascript.Undefined;
/**
* Base class for Rhino host objects in HtmlUnit.
*
* @author Mike Bowler
* @author David K. Taylor
* @author Marc Guillemot
* @author Chris Erskine
* @author Daniel Gredler
* @author Ahmed Ashour
* @author Ronald Brill
*/
public class SimpleScriptable extends HtmlUnitScriptable implements Cloneable {
private static final Log LOG = LogFactory.getLog(SimpleScriptable.class);
private DomNode domNode_;
private boolean caseSensitive_ = true;
/**
* Gets a named property from the object.
* Normally HtmlUnit objects don't need to overwrite this method as properties are defined
* on the prototypes from the XML configuration. In some cases where "content" of object
* has priority compared to the properties consider using utility {@link #getWithPreemption(String)}.
* {@inheritDoc}
*/
@Override
public Object get(String name, final Scriptable start) {
// If this object is not case-sensitive about property names, transform the property name accordingly.
if (!caseSensitive_) {
for (final Object o : getAllIds()) {
final String objectName = Context.toString(o);
if (name.equalsIgnoreCase(objectName)) {
name = objectName;
break;
}
}
}
// Try to get property configured on object itself.
Object response = super.get(name, start);
if (response != NOT_FOUND) {
return response;
}
if (this == start) {
response = getWithPreemption(name);
}
if (response == NOT_FOUND && start instanceof Window) {
response = ((Window) start).getWithFallback(name);
}
return response;
}
/**
* Called by {@link #get(String, Scriptable)} to allow retrieval of the property before the prototype
* chain is searched.
*
* IMPORTANT: This method is invoked *very* often by Rhino. If you override this method, the implementation
* needs to be as fast as possible!
*
* @param name the property name
* @return {@link Scriptable#NOT_FOUND} if not found
*/
protected Object getWithPreemption(final String name) {
return NOT_FOUND;
}
@Override
public boolean has(final int index, final Scriptable start) {
final Object found = get(index, start);
if (!Undefined.isUndefined(found) && Scriptable.NOT_FOUND != found) {
return true;
}
return super.has(index, start);
}
/**
* Returns the DOM node that corresponds to this JavaScript object or throw
* an exception if one cannot be found.
* @return the DOM node
*/
public DomNode getDomNodeOrDie() {
if (domNode_ == null) {
final String clazz = getClass().getName();
throw new IllegalStateException("DomNode has not been set for this SimpleScriptable: " + clazz);
}
return domNode_;
}
/**
* Returns the DOM node that corresponds to this JavaScript object
* or null if a node hasn't been set.
* @return the DOM node or null
*/
public DomNode getDomNodeOrNull() {
return domNode_;
}
/**
* Sets the DOM node that corresponds to this JavaScript object.
* @param domNode the DOM node
*/
public void setDomNode(final DomNode domNode) {
setDomNode(domNode, true);
}
/**
* Sets the DOM node that corresponds to this JavaScript object.
* @param domNode the DOM node
* @param assignScriptObject If true, call setScriptObject on domNode
*/
protected void setDomNode(final DomNode domNode, final boolean assignScriptObject) {
WebAssert.notNull("domNode", domNode);
domNode_ = domNode;
if (assignScriptObject) {
domNode_.setScriptableObject(this);
}
}
/**
* Returns the JavaScript object that corresponds to the specified object.
* New JavaScript objects will be created as needed. If a JavaScript object
* cannot be created for a domNode then NOT_FOUND will be returned.
*
* @param object a {@link DomNode} or a {@link WebWindow}
* @return the JavaScript object or NOT_FOUND
*/
protected SimpleScriptable getScriptableFor(final Object object) {
if (object instanceof WebWindow) {
return (SimpleScriptable) ((WebWindow) object).getScriptableObject();
}
final DomNode domNode = (DomNode) object;
final Object scriptObject = domNode.getScriptableObject();
if (scriptObject != null) {
return (SimpleScriptable) scriptObject;
}
return makeScriptableFor(domNode);
}
/**
* Builds a new the JavaScript object that corresponds to the specified object.
* @param domNode the DOM node for which a JS object should be created
* @return the JavaScript object
*/
@SuppressWarnings("unchecked")
public SimpleScriptable makeScriptableFor(final DomNode domNode) {
// Get the JS class name for the specified DOM node.
// Walk up the inheritance chain if necessary.
Class javaScriptClass = null;
if (domNode instanceof HtmlImage && "image".equals(((HtmlImage) domNode).getOriginalQualifiedName())
&& ((HtmlImage) domNode).wasCreatedByJavascript()) {
if (domNode.hasFeature(HTMLIMAGE_HTMLELEMENT)) {
javaScriptClass = HTMLElement.class;
}
else if (domNode.hasFeature(HTMLIMAGE_HTMLUNKNOWNELEMENT)) {
javaScriptClass = HTMLUnknownElement.class;
}
}
if (javaScriptClass == null) {
final JavaScriptEngine javaScriptEngine =
(JavaScriptEngine) getWindow().getWebWindow().getWebClient().getJavaScriptEngine();
for (Class c = domNode.getClass(); javaScriptClass == null && c != null; c = c.getSuperclass()) {
javaScriptClass = (Class) javaScriptEngine.getJavaScriptClass(c);
}
}
final SimpleScriptable scriptable;
if (javaScriptClass == null) {
// We don't have a specific subclass for this element so create something generic.
scriptable = new HTMLElement();
if (LOG.isDebugEnabled()) {
LOG.debug("No JavaScript class found for element <" + domNode.getNodeName() + ">. Using HTMLElement");
}
}
else {
try {
scriptable = javaScriptClass.newInstance();
}
catch (final Exception e) {
throw Context.throwAsScriptRuntimeEx(e);
}
}
initParentScope(domNode, scriptable);
scriptable.setPrototype(getPrototype(javaScriptClass));
scriptable.setDomNode(domNode);
return scriptable;
}
/**
* Initialize the parent scope of a newly created scriptable.
* @param domNode the DOM node for the script object
* @param scriptable the script object to initialize
*/
protected void initParentScope(final DomNode domNode, final SimpleScriptable scriptable) {
final SgmlPage page = domNode.getPage();
final WebWindow enclosingWindow = page.getEnclosingWindow();
if (enclosingWindow != null && enclosingWindow.getEnclosedPage() == page) {
scriptable.setParentScope(enclosingWindow.getScriptableObject());
}
else {
scriptable.setParentScope(ScriptableObject.getTopLevelScope(page.getScriptableObject()));
}
}
/**
* Gets the prototype object for the given host class.
* @param javaScriptClass the host class
* @return the prototype
*/
@SuppressWarnings("unchecked")
public Scriptable getPrototype(final Class javaScriptClass) {
final Scriptable prototype = getWindow().getPrototype(javaScriptClass);
if (prototype == null && javaScriptClass != SimpleScriptable.class) {
return getPrototype((Class) javaScriptClass.getSuperclass());
}
return prototype;
}
/**
* Returns the JavaScript default value of this object. This is the JavaScript equivalent of a toString() in Java.
*
* @param hint a hint as to the format of the default value (ignored in this case)
* @return the default value
*/
@Override
public Object getDefaultValue(final Class hint) {
if (String.class.equals(hint) || hint == null) {
return "[object " + getClassName() + "]";
}
return super.getDefaultValue(hint);
}
/**
* Gets the window that is the top scope for this object.
* @return the window associated with this object
* @throws RuntimeException if the window cannot be found, which should never occur
*/
public Window getWindow() throws RuntimeException {
return getWindow(this);
}
/**
* Gets the window that is the top scope for the specified object.
* @param s the JavaScript object whose associated window is to be returned
* @return the window associated with the specified JavaScript object
* @throws RuntimeException if the window cannot be found, which should never occur
*/
protected static Window getWindow(final Scriptable s) throws RuntimeException {
final Scriptable top = ScriptableObject.getTopLevelScope(s);
if (top instanceof Window) {
return (Window) top;
}
throw new RuntimeException("Unable to find window associated with " + s);
}
/**
* Gets the scriptable used at starting scope for the execution of current script.
* @return the scope as defined in {@link JavaScriptEngine#callFunction}
* or {@link JavaScriptEngine#execute}.
*/
protected Scriptable getStartingScope() {
@SuppressWarnings("unchecked")
final Deque stack =
(Deque) Context.getCurrentContext().getThreadLocal(JavaScriptEngine.KEY_STARTING_SCOPE);
if (null == stack) {
return null;
}
return stack.peek();
}
/**
* Gets the browser version currently used.
* @return the browser version
*/
public BrowserVersion getBrowserVersion() {
final DomNode node = getDomNodeOrNull();
if (node != null) {
return node.getPage().getWebClient().getBrowserVersion();
}
return getWindow().getWebWindow().getWebClient().getBrowserVersion();
}
/**
* {@inheritDoc}
*/
@Override
public boolean hasInstance(final Scriptable instance) {
if (getPrototype() == null) {
// to handle cases like "x instanceof HTMLElement",
// but HTMLElement is not in the prototype chain of any element
final Object prototype = get("prototype", this);
if (!(prototype instanceof ScriptableObject)) {
Context.throwAsScriptRuntimeEx(new Exception("Null prototype"));
}
return ((ScriptableObject) prototype).hasInstance(instance);
}
return super.hasInstance(instance);
}
/**
* {@inheritDoc}
*/
@Override
protected Object equivalentValues(Object value) {
if (value instanceof SimpleScriptableProxy) {
value = ((SimpleScriptableProxy) value).getDelegee();
}
return super.equivalentValues(value);
}
/**
* {@inheritDoc}
*/
@Override
public SimpleScriptable clone() {
try {
return (SimpleScriptable) super.clone();
}
catch (final Exception e) {
throw new IllegalStateException("Clone not supported");
}
}
/**
* Sets case sensitivity of all properties of this scriptable.
* @param caseSensitive case sensitive or no
*/
public void setCaseSensitive(final boolean caseSensitive) {
caseSensitive_ = caseSensitive;
final Scriptable prototype = getPrototype();
if (prototype instanceof SimpleScriptable) {
((SimpleScriptable) prototype).setCaseSensitive(caseSensitive);
}
}
}
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