/*
 * Copyright 2002-2018 the original author or authors.
 *
 * 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 org.springframework.web.servlet.tags;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTag;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.util.JavaScriptUtils;

The <escapeBody> tag is used to escape its enclosed body content, applying HTML escaping and/or JavaScript escaping. 
Provides a "htmlEscape" property for explicitly specifying whether to
apply HTML escaping. If not set, a page-level default (e.g. from the
HtmlEscapeTag) or an application-wide default (the "defaultHtmlEscape"
context-param in web.xml) is used.
Provides a "javaScriptEscape" property for specifying whether to apply
JavaScript escaping. Can be combined with HTML escaping or used standalone.

Attribute Summary


Attribute
Required?
Runtime Expression?
Description




htmlEscape
false
true
Set HTML escaping for this tag, as boolean value.
Overrides the default HTML escaping setting for the current page.


javaScriptEscape
false
true
Set JavaScript escaping for this tag, as boolean value.
Default is false.



Author:
Juergen Hoeller
See Also:
HtmlUtils
JavaScriptUtils
Since:
1.1.1/**
 * The {@code <escapeBody>} tag is used to escape its enclosed body content,
 * applying HTML escaping and/or JavaScript escaping.
 *
 * <p>Provides a "htmlEscape" property for explicitly specifying whether to
 * apply HTML escaping. If not set, a page-level default (e.g. from the
 * HtmlEscapeTag) or an application-wide default (the "defaultHtmlEscape"
 * context-param in web.xml) is used.
 *
 * <p>Provides a "javaScriptEscape" property for specifying whether to apply
 * JavaScript escaping. Can be combined with HTML escaping or used standalone.
 *
 * <table>
 * <caption>Attribute Summary</caption>
 * <thead>
 * <tr>
 * <th>Attribute</th>
 * <th>Required?</th>
 * <th>Runtime Expression?</th>
 * <th>Description</th>
 * </tr>
 * </thead>
 * <tbody>
 * <tr>
 * <td>htmlEscape</td>
 * <td>false</td>
 * <td>true</td>
 * <td>Set HTML escaping for this tag, as boolean value.
 * Overrides the default HTML escaping setting for the current page.</td>
 * </tr>
 * <tr>
 * <td>javaScriptEscape</td>
 * <td>false</td>
 * <td>true</td>
 * <td>Set JavaScript escaping for this tag, as boolean value.
 * Default is false.</td>
 * </tr>
 * </tbody>
 * </table>
 *
 * @author Juergen Hoeller
 * @since 1.1.1
 * @see org.springframework.web.util.HtmlUtils
 * @see org.springframework.web.util.JavaScriptUtils
 */
@SuppressWarnings("serial")
public class EscapeBodyTag extends HtmlEscapingAwareTag implements BodyTag {

	private boolean javaScriptEscape = false;

	@Nullable
	private BodyContent bodyContent;


	
Set JavaScript escaping for this tag, as boolean value.
Default is "false".
/**
	 * Set JavaScript escaping for this tag, as boolean value.
	 * Default is "false".
	 */
	public void setJavaScriptEscape(boolean javaScriptEscape) throws JspException {
		this.javaScriptEscape = javaScriptEscape;
	}


	@Override
	protected int doStartTagInternal() {
		// do nothing
		return EVAL_BODY_BUFFERED;
	}

	@Override
	public void doInitBody() {
		// do nothing
	}

	@Override
	public void setBodyContent(BodyContent bodyContent) {
		this.bodyContent = bodyContent;
	}

	@Override
	public int doAfterBody() throws JspException {
		try {
			String content = readBodyContent();
			// HTML and/or JavaScript escape, if demanded
			content = htmlEscape(content);
			content = (this.javaScriptEscape ? JavaScriptUtils.javaScriptEscape(content) : content);
			writeBodyContent(content);
		}
		catch (IOException ex) {
			throw new JspException("Could not write escaped body", ex);
		}
		return (SKIP_BODY);
	}

	
Read the unescaped body content from the page.
Throws:
IOException – if reading failed
Returns:
the original content/**
	 * Read the unescaped body content from the page.
	 * @return the original content
	 * @throws IOException if reading failed
	 */
	protected String readBodyContent() throws IOException {
		Assert.state(this.bodyContent != null, "No BodyContent set");
		return this.bodyContent.getString();
	}

	
Write the escaped body content to the page.
Can be overridden in subclasses, e.g. for testing purposes.
Params:
content – the content to write
Throws:
IOException – if writing failed/**
	 * Write the escaped body content to the page.
	 * <p>Can be overridden in subclasses, e.g. for testing purposes.
	 * @param content the content to write
	 * @throws IOException if writing failed
	 */
	protected void writeBodyContent(String content) throws IOException {
		Assert.state(this.bodyContent != null, "No BodyContent set");
		this.bodyContent.getEnclosingWriter().print(content);
	}

}