Source Code Cross Referenced for GrantedAuthorityEffectiveAclsResolver.java in  » Security » acegi-security » org » acegisecurity » acl » basic » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Security » acegi security » org.acegisecurity.acl.basic 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
002:         *
003:         * Licensed under the Apache License, Version 2.0 (the "License");
004:         * you may not use this file except in compliance with the License.
005:         * You may obtain a copy of the License at
006:         *
007:         *     http://www.apache.org/licenses/LICENSE-2.0
008:         *
009:         * Unless required by applicable law or agreed to in writing, software
010:         * distributed under the License is distributed on an "AS IS" BASIS,
011:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:         * See the License for the specific language governing permissions and
013:         * limitations under the License.
014:         */
015:
016:        package org.acegisecurity.acl.basic;
017:
018:        import org.acegisecurity.Authentication;
019:        import org.acegisecurity.GrantedAuthority;
020:
021:        import org.acegisecurity.acl.AclEntry;
022:
023:        import org.acegisecurity.userdetails.UserDetails;
024:
025:        import org.apache.commons.logging.Log;
026:        import org.apache.commons.logging.LogFactory;
027:
028:        import java.util.List;
029:        import java.util.Vector;
030:
031:        /**
032:         * Simple implementation of {@link EffectiveAclsResolver}.<P>This implementation does not need to understand the
033:         * "recipient" types presented in a <code>BasicAclEntry</code> because it merely delegates to the detected {@link
034:         * Authentication#getPrincipal()} or {@link Authentication#getAuthorities()}. The principal object or granted
035:         * authorities object has its <code>Object.equals(recipient)</code> method called to make the decision as to whether
036:         * the recipient in the <code>BasicAclEntry</code> is the same as the principal or granted authority.</p>
037:         *  <P>This class should prove an adequate ACLs resolver if you're using standard Acegi Security classes. This is
038:         * because the typical <code>Authentication</code> token is <code>UsernamePasswordAuthenticationToken</code>, which
039:         * for its <code>principal</code> is usually a <code>String</code>. The <code>GrantedAuthorityImpl</code> is typically
040:         * used for granted authorities, which tests for equality based on a <code>String</code>. This means
041:         * <code>BasicAclDao</code>s simply need to return a <code>String</code> to represent the recipient. If you use
042:         * non-<code>String</code> objects, you will probably require an alternative <code>EffectiveAclsResolver</code>.</p>
043:         *
044:         * @author Ben Alex
045:         * @version $Id: GrantedAuthorityEffectiveAclsResolver.java 1784 2007-02-24 21:00:24Z luke_t $
046:         */
047:        public class GrantedAuthorityEffectiveAclsResolver implements 
048:                EffectiveAclsResolver {
049:            //~ Static fields/initializers =====================================================================================
050:
051:            private static final Log logger = LogFactory
052:                    .getLog(GrantedAuthorityEffectiveAclsResolver.class);
053:
054:            //~ Methods ========================================================================================================
055:
056:            public AclEntry[] resolveEffectiveAcls(AclEntry[] allAcls,
057:                    Authentication filteredBy) {
058:                if ((allAcls == null) || (allAcls.length == 0)) {
059:                    return null;
060:                }
061:
062:                List list = new Vector();
063:
064:                if (logger.isDebugEnabled()) {
065:                    logger.debug("Locating AclEntry[]s (from set of "
066:                            + ((allAcls == null) ? 0 : allAcls.length)
067:                            + ") that apply to Authentication: " + filteredBy);
068:                }
069:
070:                for (int i = 0; i < allAcls.length; i++) {
071:                    if (!(allAcls[i] instanceof  BasicAclEntry)) {
072:                        continue;
073:                    }
074:
075:                    Object recipient = ((BasicAclEntry) allAcls[i])
076:                            .getRecipient();
077:
078:                    // Allow the Authentication's getPrincipal to decide whether
079:                    // the presented recipient is "equal" (allows BasicAclDaos to
080:                    // return Strings rather than proper objects in simple cases)
081:                    if (filteredBy.getPrincipal().equals(recipient)) {
082:                        if (logger.isDebugEnabled()) {
083:                            logger
084:                                    .debug("Principal matches AclEntry recipient: "
085:                                            + recipient);
086:                        }
087:
088:                        list.add(allAcls[i]);
089:                    } else if (filteredBy.getPrincipal() instanceof  UserDetails
090:                            && ((UserDetails) filteredBy.getPrincipal())
091:                                    .getUsername().equals(recipient)) {
092:                        if (logger.isDebugEnabled()) {
093:                            logger
094:                                    .debug("Principal (from UserDetails) matches AclEntry recipient: "
095:                                            + recipient);
096:                        }
097:
098:                        list.add(allAcls[i]);
099:                    } else {
100:                        // No direct match against principal; try each authority.
101:                        // As with the principal, allow each of the Authentication's
102:                        // granted authorities to decide whether the presented
103:                        // recipient is "equal"
104:                        GrantedAuthority[] authorities = filteredBy
105:                                .getAuthorities();
106:
107:                        if ((authorities == null) || (authorities.length == 0)) {
108:                            if (logger.isDebugEnabled()) {
109:                                logger
110:                                        .debug("Did not match principal and there are no granted authorities, "
111:                                                + "so cannot compare with recipient: "
112:                                                + recipient);
113:                            }
114:
115:                            continue;
116:                        }
117:
118:                        for (int k = 0; k < authorities.length; k++) {
119:                            if (authorities[k].equals(recipient)) {
120:                                if (logger.isDebugEnabled()) {
121:                                    logger.debug("GrantedAuthority: "
122:                                            + authorities[k]
123:                                            + " matches recipient: "
124:                                            + recipient);
125:                                }
126:
127:                                list.add(allAcls[i]);
128:                            }
129:                        }
130:                    }
131:                }
132:
133:                // return null if appropriate (as per interface contract)
134:                if (list.size() > 0) {
135:                    if (logger.isDebugEnabled()) {
136:                        logger.debug("Returning effective AclEntry array with "
137:                                + list.size() + " elements");
138:                    }
139:
140:                    return (BasicAclEntry[]) list
141:                            .toArray(new BasicAclEntry[] {});
142:                } else {
143:                    if (logger.isDebugEnabled()) {
144:                        logger
145:                                .debug("Returning null AclEntry array as zero effective AclEntrys found");
146:                    }
147:
148:                    return null;
149:                }
150:            }
151:        }
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