org.sakaiproject.nakamura.lite.jackrabbit.SparseImpersonationImpl.java Source code

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Here is the source code for org.sakaiproject.nakamura.lite.jackrabbit.SparseImpersonationImpl.java

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/**
 * Licensed to the Sakai Foundation (SF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The SF licenses this file
 * to you 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
 *
 *     http://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.sakaiproject.nakamura.lite.jackrabbit;

import org.apache.commons.lang.StringUtils;
import org.apache.jackrabbit.api.security.principal.PrincipalIterator;
import org.apache.jackrabbit.api.security.user.Impersonation;
import org.apache.jackrabbit.core.security.SystemPrincipal;
import org.apache.jackrabbit.core.security.principal.AdminPrincipal;
import org.apache.jackrabbit.core.security.principal.PrincipalIteratorAdapter;
import org.sakaiproject.nakamura.api.lite.authorizable.User;
import org.sakaiproject.nakamura.api.lite.util.Iterables;
import org.sakaiproject.nakamura.api.lite.util.PreemptiveIterator;

import java.security.Principal;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import javax.jcr.RepositoryException;
import javax.security.auth.Subject;

public class SparseImpersonationImpl implements Impersonation {

    private SparseUser sparseUser;

    public SparseImpersonationImpl(SparseUser sparseUser) {
        this.sparseUser = sparseUser;
    }

    @SuppressWarnings("unchecked")
    public PrincipalIterator getImpersonators() throws RepositoryException {
        User u = sparseUser.getSparseUser();
        String impersonators = (String) u.getProperty(User.PRINCIPALS_FIELD);
        if (impersonators == null) {
            return new PrincipalIteratorAdapter(Collections.EMPTY_LIST);
        }
        final Iterator<String> imperson = Iterables.of(StringUtils.split(impersonators, ';')).iterator();
        return new PrincipalIteratorAdapter(new PreemptiveIterator<Principal>() {

            private Principal principal;

            protected boolean internalHasNext() {
                if (imperson.hasNext()) {
                    String userId = imperson.next();
                    if (User.ADMIN_USER.equals(userId)) {
                        principal = new AdminPrincipal(userId);
                    } else if (User.SYSTEM_USER.equals(userId)) {
                        principal = new SystemPrincipal();
                    } else {
                        principal = new SparsePrincipal(imperson.next(), this.getClass().getName(),
                                SparseMapUserManager.USERS_PATH);
                    }
                    return true;
                }
                principal = null;
                return false;
            }

            protected Principal internalNext() {
                return principal;
            }

        });
    }

    public boolean grantImpersonation(Principal principal) throws RepositoryException {
        if (principal instanceof AdminPrincipal || principal instanceof SystemPrincipal) {
            return false;
        }
        User u = sparseUser.getSparseUser();
        String impersonators = (String) u.getProperty(User.IMPERSONATORS_FIELD);
        Set<String> imp = new HashSet<String>();
        Collections.addAll(imp, StringUtils.split(impersonators, ';'));
        String name = principal.getName();
        if (!imp.contains(name)) {
            imp.add(name);
            u.setProperty(User.PRINCIPALS_FIELD, StringUtils.join(imp, ';'));
            sparseUser.save();
            return true;
        }
        return false;
    }

    public boolean revokeImpersonation(Principal principal) throws RepositoryException {
        if (principal instanceof AdminPrincipal || principal instanceof SystemPrincipal) {
            return false;
        }
        User u = sparseUser.getSparseUser();
        String impersonators = (String) u.getProperty(User.IMPERSONATORS_FIELD);
        Set<String> imp = new HashSet<String>();
        Collections.addAll(imp, StringUtils.split(impersonators, ';'));
        String name = principal.getName();
        if (imp.contains(name)) {
            imp.remove(name);
            u.setProperty(User.PRINCIPALS_FIELD, StringUtils.join(imp, ';'));
            sparseUser.save();
            return true;
        }
        return false;
    }

    public boolean allows(Subject subject) throws RepositoryException {
        if (!subject.getPrincipals(AdminPrincipal.class).isEmpty()
                || !subject.getPrincipals(SystemPrincipal.class).isEmpty()) {
            return true;
        }
        User u = sparseUser.getSparseUser();
        String impersonators = (String) u.getProperty(User.IMPERSONATORS_FIELD);
        Set<String> imp = new HashSet<String>();
        Collections.addAll(imp, StringUtils.split(impersonators, ';'));
        for (Principal p : subject.getPrincipals()) {
            if (imp.contains(p.getName())) {
                return true;
            }
        }
        return false;
    }

}