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1   /*
2    * Copyright 2004-2009 the Seasar Foundation and the Others.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific language
14   * governing permissions and limitations under the License.
15   */
16  package org.seasar.cubby.tags;
17  
18  import static org.seasar.cubby.tags.TagUtils.toAttr;
19  
20  import java.io.IOException;
21  
22  import javax.servlet.http.HttpServletRequest;
23  import javax.servlet.http.HttpSession;
24  import javax.servlet.jsp.JspException;
25  import javax.servlet.jsp.JspWriter;
26  import javax.servlet.jsp.PageContext;
27  
28  import org.seasar.cubby.internal.util.StringUtils;
29  import org.seasar.cubby.internal.util.TokenHelper;
30  import org.seasar.cubby.validator.validators.TokenValidator;
31  
32  /**
33   * 2重サブミット防止用の <code>&lt;input type="hidden"/&gt;</code> タグを出力するタグ。
34   * <p>
35   * このタグが呼び出されると一意なトークン文字列を生成して hidden とセッションに格納します。 サブミットされた先の処理の検証フェーズで、ポストされた
36   * hidden 値とセッション中の値を比較して、 一致しない場合、不正な経路からのアクセスとみなしてエラー処理を行います。
37   * </p>
38   * 
39   * @see TokenValidator#validate(org.seasar.cubby.validator.ValidationContext,
40   *      Object[])
41   * @author agata
42   */
43  public class TokenTag extends DynamicAttributesSimpleTagSupport {
44  
45  	private String name;
46  
47  	/**
48  	 * name属性を設定します。
49  	 * 
50  	 * @param name
51  	 *            name属性
52  	 */
53  	public void setName(final String name) {
54  		this.name = name;
55  	}
56  
57  	/**
58  	 * {@inheritDoc}
59  	 */
60  	@Override
61  	public void doTag() throws JspException, IOException {
62  		final PageContext context = (PageContext) getJspContext();
63  		final JspWriter out = context.getOut();
64  
65  		final String token = TokenHelper.generateGUID();
66  		final PageContext pageContext = (PageContext) getJspContext();
67  		final HttpServletRequest request = (HttpServletRequest) pageContext
68  				.getRequest();
69  		final HttpSession session = request.getSession();
70  		TokenHelper.setToken(session, token);
71  
72  		out.append("<input type=\"hidden\" name=\"");
73  		if (StringUtils.isEmpty(name)) {
74  			out.append(TokenHelper.DEFAULT_TOKEN_NAME);
75  		} else {
76  			out.append(name);
77  		}
78  		out.append("\" value=\"");
79  		out.append(token);
80  		out.append("\" ");
81  		out.write(toAttr(getDynamicAttributes()));
82  		out.append("/>");
83  	}
84  
85  }