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Java > Open Source Codes > com > jcorporate > expresso > ext > taglib > IfMemberOfGroup


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64
65 /**
66  * IfMemberOfGroup.java
67  *
68  * Copyright 1999, 2000, 2001 Jcorporate Ltd.
69  */
70 package com.jcorporate.expresso.ext.taglib;
71
72 import com.jcorporate.expresso.core.misc.CurrentLogin;
73 import com.jcorporate.expresso.core.security.User;
74 import com.jcorporate.expresso.services.dbobj.GroupMembers;
75
76 import javax.servlet.http.HttpServletRequest JavaDoc;
77 import javax.servlet.http.HttpServletResponse JavaDoc;
78 import javax.servlet.jsp.JspTagException JavaDoc;
79 import java.util.StringTokenizer JavaDoc;
80
81
82 /**
83  * This tag checks the currently logged in user for membership into
84  * a specified security group.
85  *
86  * @author Shash Chatterjee
87  */
88 public class IfMemberOfGroup
89         extends ExpressoTagSupport {
90     private boolean inverse = false;
91     private String JavaDoc groupname = "";
92     private String JavaDoc delimiter = "";
93
94     /**
95      * The public constructor.
96      */
97     public IfMemberOfGroup() {
98         super();
99     }
100
101     /**
102      * No special handling at end of tag
103      *
104      * @return int as defined by the JSP taglib spec
105      * @throws JspTagException as per defined by the spec signature
106      */
107     public int doEndTag()
108             throws javax.servlet.jsp.JspTagException JavaDoc {
109         return EVAL_PAGE;
110     }
111
112     /**
113      * The tag implementation is right here...
114      *
115      * @return int as defined by the JSP taglib spec
116      * @throws JspTagException as per defined by the spec signature
117      */
118     public int doStartTag()
119             throws javax.servlet.jsp.JspTagException JavaDoc {
120
121         boolean isMember = false;
122         String JavaDoc userName = "";
123
124         try {
125             // Get the current user from the servlet session
126 HttpServletRequest JavaDoc request = (HttpServletRequest JavaDoc) pageContext.getRequest();
127             HttpServletResponse JavaDoc response = (HttpServletResponse JavaDoc) pageContext.getResponse();
128 // CheckLogin chk = CheckLogin.getInstance();
129 // chk.checkLogin(request, response);
130 CurrentLogin myLogin = (CurrentLogin) pageContext.getSession().getAttribute(CurrentLogin.LOGIN_KEY);
131             if (myLogin != null) {
132                 // Extract relevant parameters needed to lookup group membership
133 int uid = myLogin.getUid();
134                 userName = myLogin.getUserName();
135
136                 String JavaDoc currentDB = myLogin.getDBName();
137
138                 // Check group membership
139 // NOTE: User:Admin is blindly given membership in every group
140 if (User.isAdmin(userName)) {
141                     isMember = true;
142                 } else if (!"".equals(delimiter)) {
143                     StringTokenizer JavaDoc stok = new StringTokenizer JavaDoc(groupname, delimiter);
144                     while (stok.hasMoreTokens()) {
145                         String JavaDoc oneGroup = stok.nextToken();
146                         GroupMembers gm = new GroupMembers(User.getAdminId(currentDB));
147                         gm.setDataContext(currentDB);
148                         gm.setField("ExpUid", uid);
149                         gm.setField("GroupName", oneGroup);
150
151                         if (gm.find()) {
152                             isMember = true;
153                             break;
154                         }
155                     }
156                 } else {
157                     GroupMembers gm = new GroupMembers(User.getAdminId(currentDB));
158                     gm.setDataContext(currentDB);
159                     gm.setField("ExpUid", uid);
160                     gm.setField("GroupName", groupname);
161
162                     if (gm.find()) {
163                         isMember = true;
164                     }
165                 }
166             }
167         } catch (Exception JavaDoc e) {
168             throw new JspTagException JavaDoc("Exception:" +
169                     e.getMessage());
170         }
171
172         // If not logged in....
173 if (userName.equals("") || User.isUnknownUser(userName)) {
174             isMember = false;
175         }
176
177         // Check if reverse logic was specified (i.e. NOT memberOf)
178 if (inverse) {
179             isMember = !isMember;
180         }
181
182         // Process rest of tag if user is a member of group, skip it otherwise.
183 if (isMember) {
184             return EVAL_BODY_INCLUDE;
185         } else {
186             return SKIP_BODY;
187         }
188     }
189
190     /**
191      * Getter for inverse member
192      *
193      * @return boolean
194      */
195     public boolean getInverse() {
196         return inverse;
197     }
198
199     /**
200      * Setter for inverse.
201      *
202      * @param newInverse If set, a reverse logic lookup is performed.
203      */
204     public void setInverse(boolean newInverse) {
205         inverse = newInverse;
206     }
207
208     /**
209      * Getter for groupname member
210      *
211      * @return String
212      */
213     public String JavaDoc getGroupname() {
214         return groupname;
215     }
216
217     /**
218      * Setter for groupname
219      *
220      * @param name The group name to check membership for
221      */
222     public void setGroupname(String JavaDoc name) {
223         groupname = name;
224     }
225
226     /**
227      * Getter for delimiter
228      *
229      * @return Returns the delimiter.
230      */
231     public String JavaDoc getDelimiter() {
232         return delimiter;
233     }
234
235     /**
236      * Setter for delimiter
237      *
238      * @param seperator The delimiter to set.
239      */
240     public void setDelimiter(String JavaDoc delimiter) {
241         this.delimiter = delimiter;
242     }
243 } /* IfLoggedIn */
244
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