Source Code Cross Referenced for AbstractVirtualUserTable.java in  » Net » james-2.3.1 » org » apache » james » transport » mailets » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » james 2.3.1 » org.apache.james.transport.mailets 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /****************************************************************
002:         * Licensed to the Apache Software Foundation (ASF) under one   *
003:         * or more contributor license agreements.  See the NOTICE file *
004:         * distributed with this work for additional information        *
005:         * regarding copyright ownership.  The ASF licenses this file   *
006:         * to you under the Apache License, Version 2.0 (the            *
007:         * "License"); you may not use this file except in compliance   *
008:         * with the License.  You may obtain a copy of the License at   *
009:         *                                                              *
010:         *   http://www.apache.org/licenses/LICENSE-2.0                 *
011:         *                                                              *
012:         * Unless required by applicable law or agreed to in writing,   *
013:         * software distributed under the License is distributed on an  *
014:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015:         * KIND, either express or implied.  See the License for the    *
016:         * specific language governing permissions and limitations      *
017:         * under the License.                                           *
018:         ****************************************************************/package org.apache.james.transport.mailets;
019:
020:        import org.apache.james.core.MailImpl;
021:        import org.apache.james.util.XMLResources;
022:        import org.apache.mailet.GenericMailet;
023:        import org.apache.mailet.Mail;
024:        import org.apache.mailet.MailAddress;
025:        import org.apache.oro.text.regex.MatchResult;
026:        import org.apache.oro.text.regex.Pattern;
027:        import org.apache.oro.text.regex.Perl5Compiler;
028:        import org.apache.oro.text.regex.Perl5Matcher;
029:
030:        import javax.mail.MessagingException;
031:        import javax.mail.internet.ParseException;
032:
033:        import java.util.ArrayList;
034:        import java.util.Collection;
035:        import java.util.HashMap;
036:        import java.util.HashSet;
037:        import java.util.Iterator;
038:        import java.util.Map;
039:        import java.util.StringTokenizer;
040:
041:        /**
042:         * Provides an abstraction of common functionality needed for implementing
043:         * a Virtual User Table. Override the <code>mapRecipients</code> method to
044:         * map virtual recipients to real recipients.
045:         */
046:        public abstract class AbstractVirtualUserTable extends GenericMailet {
047:            static private final String MARKER = "org.apache.james.transport.mailets.AbstractVirtualUserTable.mapped";
048:
049:            /**
050:             * Checks the recipient list of the email for user mappings.  Maps recipients as
051:             * appropriate, modifying the recipient list of the mail and sends mail to any new
052:             * non-local recipients.
053:             *
054:             * @param mail the mail to process
055:             */
056:            public void service(Mail mail) throws MessagingException {
057:                if (mail.getAttribute(MARKER) != null) {
058:                    mail.removeAttribute(MARKER);
059:                    return;
060:                }
061:
062:                Collection recipientsToRemove = new HashSet();
063:                Collection recipientsToAddLocal = new ArrayList();
064:                Collection recipientsToAddForward = new ArrayList();
065:
066:                Collection recipients = mail.getRecipients();
067:                Map recipientsMap = new HashMap(recipients.size());
068:
069:                for (Iterator iter = recipients.iterator(); iter.hasNext();) {
070:                    MailAddress address = (MailAddress) iter.next();
071:
072:                    // Assume all addresses are non-virtual at start
073:                    recipientsMap.put(address, null);
074:                }
075:
076:                mapRecipients(recipientsMap);
077:
078:                for (Iterator iter = recipientsMap.keySet().iterator(); iter
079:                        .hasNext();) {
080:                    MailAddress source = (MailAddress) iter.next();
081:                    String targetString = (String) recipientsMap.get(source);
082:
083:                    // Only non-null mappings are translated
084:                    if (targetString != null) {
085:                        if (targetString.startsWith("error:")) {
086:                            //Mark this source address as an address to remove from the recipient list
087:                            recipientsToRemove.add(source);
088:                            processDSN(mail, source, targetString);
089:                        } else {
090:                            StringTokenizer tokenizer = new StringTokenizer(
091:                                    targetString, getSeparator(targetString));
092:
093:                            while (tokenizer.hasMoreTokens()) {
094:                                String targetAddress = tokenizer.nextToken()
095:                                        .trim();
096:
097:                                // log("Attempting to map from " + source + " to " + targetAddress);
098:
099:                                if (targetAddress.startsWith("regex:")) {
100:                                    targetAddress = regexMap(mail, source,
101:                                            targetAddress);
102:                                    if (targetAddress == null)
103:                                        continue;
104:                                }
105:
106:                                try {
107:                                    MailAddress target = (targetAddress
108:                                            .indexOf('@') < 0) ? new MailAddress(
109:                                            targetAddress, "localhost")
110:                                            : new MailAddress(targetAddress);
111:
112:                                    //Mark this source address as an address to remove from the recipient list
113:                                    recipientsToRemove.add(source);
114:
115:                                    // We need to separate local and remote
116:                                    // recipients.  This is explained below.
117:                                    if (getMailetContext().isLocalServer(
118:                                            target.getHost())) {
119:                                        recipientsToAddLocal.add(target);
120:                                    } else {
121:                                        recipientsToAddForward.add(target);
122:                                    }
123:
124:                                    StringBuffer buf = new StringBuffer()
125:                                            .append("Translating virtual user ")
126:                                            .append(source).append(" to ")
127:                                            .append(target);
128:                                    log(buf.toString());
129:
130:                                } catch (ParseException pe) {
131:                                    //Don't map this address... there's an invalid address mapping here
132:                                    StringBuffer exceptionBuffer = new StringBuffer(
133:                                            128).append(
134:                                            "There is an invalid map from ")
135:                                            .append(source).append(" to ")
136:                                            .append(targetAddress);
137:                                    log(exceptionBuffer.toString());
138:                                    continue;
139:                                }
140:                            }
141:                        }
142:                    }
143:                }
144:
145:                // Remove mapped recipients
146:                recipients.removeAll(recipientsToRemove);
147:
148:                // Add mapped recipients that are local
149:                recipients.addAll(recipientsToAddLocal);
150:
151:                // We consider an address that we map to be, by definition, a
152:                // local address.  Therefore if we mapped to a remote address,
153:                // then we want to make sure that the mail can be relayed.
154:                // However, the original e-mail would typically be subjected to
155:                // relay testing.  By posting a new mail back through the
156:                // system, we have a locally generated mail, which will not be
157:                // subjected to relay testing.
158:
159:                // Forward to mapped recipients that are remote
160:                if (recipientsToAddForward.size() != 0) {
161:                    // Can't use this ... some mappings could lead to an infinite loop
162:                    // getMailetContext().sendMail(mail.getSender(), recipientsToAddForward, mail.getMessage());
163:
164:                    // duplicates the Mail object, to be able to modify the new mail keeping the original untouched
165:                    MailImpl newMail = new MailImpl(mail, newName(mail));
166:                    try {
167:                        try {
168:                            newMail.setRemoteAddr(java.net.InetAddress
169:                                    .getLocalHost().getHostAddress());
170:                            newMail.setRemoteHost(java.net.InetAddress
171:                                    .getLocalHost().getHostName());
172:                        } catch (java.net.UnknownHostException _) {
173:                            newMail.setRemoteAddr("127.0.0.1");
174:                            newMail.setRemoteHost("localhost");
175:                        }
176:                        newMail.setRecipients(recipientsToAddForward);
177:                        newMail.setAttribute(MARKER, Boolean.TRUE);
178:                        getMailetContext().sendMail(newMail);
179:                    } finally {
180:                        newMail.dispose();
181:                    }
182:                }
183:
184:                // If there are no recipients left, Ghost the message
185:                if (recipients.size() == 0) {
186:                    mail.setState(Mail.GHOST);
187:                }
188:            }
189:
190:            /**
191:             * Override to map virtual recipients to real recipients, both local and non-local.
192:             * Each key in the provided map corresponds to a potential virtual recipient, stored as
193:             * a <code>MailAddress</code> object.
194:             * 
195:             * Translate virtual recipients to real recipients by mapping a string containing the
196:             * address of the real recipient as a value to a key. Leave the value <code>null<code>
197:             * if no mapping should be performed. Multiple recipients may be specified by delineating
198:             * the mapped string with commas, semi-colons or colons.
199:             * 
200:             * @param recipientsMap the mapping of virtual to real recipients, as 
201:             *    <code>MailAddress</code>es to <code>String</code>s.
202:             */
203:            protected abstract void mapRecipients(Map recipientsMap)
204:                    throws MessagingException;
205:
206:            /**
207:             * Sends the message for DSN processing
208:             *
209:             * @param mail the Mail instance being processed
210:             * @param address the MailAddress causing the DSN
211:             * @param error a String in the form "error:<code> <msg>"
212:             */
213:            private void processDSN(Mail mail, MailAddress address, String error) {
214:                // parse "error:<code> <msg>"
215:                int msgPos = error.indexOf(' ');
216:                try {
217:                    Integer code = Integer.valueOf(error.substring("error:"
218:                            .length(), msgPos));
219:                } catch (NumberFormatException e) {
220:                    log("Cannot send DSN.  Exception parsing DSN code from: "
221:                            + error, e);
222:                    return;
223:                }
224:                String msg = error.substring(msgPos + 1);
225:                // process bounce for "source" address
226:                try {
227:                    getMailetContext().bounce(mail, error);
228:                } catch (MessagingException me) {
229:                    log("Cannot send DSN.  Exception during DSN processing: ",
230:                            me);
231:                }
232:            }
233:
234:            /**
235:             * Processes regex virtual user mapping
236:             *
237:             * If a mapped target string begins with the prefix regex:, it must be
238:             * formatted as regex:<regular-expression>:<parameterized-string>,
239:             * e.g., regex:(.*)@(.*):${1}@tld
240:             *
241:             * @param mail the Mail instance being processed
242:             * @param address the MailAddress to be mapped
243:             * @param targetString a String specifying the mapping
244:             */
245:            private String regexMap(Mail mail, MailAddress address,
246:                    String targetString) {
247:                String result = null;
248:
249:                try {
250:                    int msgPos = targetString.indexOf(':',
251:                            "regex:".length() + 1);
252:
253:                    // log("regex: targetString = " + targetString);
254:                    // log("regex: msgPos = " + msgPos);
255:                    // log("regex: compile " + targetString.substring("regex:".length(), msgPos));
256:                    // log("regex: address = " + address.toString());
257:                    // log("regex: replace = " + targetString.substring(msgPos + 1));
258:
259:                    Pattern pattern = new Perl5Compiler().compile(targetString
260:                            .substring("regex:".length(), msgPos));
261:                    Perl5Matcher matcher = new Perl5Matcher();
262:
263:                    if (matcher.matches(address.toString(), pattern)) {
264:                        MatchResult match = matcher.getMatch();
265:                        Map parameters = new HashMap(match.groups());
266:                        for (int i = 1; i < match.groups(); i++) {
267:                            parameters.put(Integer.toString(i), match.group(i));
268:                        }
269:                        result = XMLResources.replaceParameters(targetString
270:                                .substring(msgPos + 1), parameters);
271:                    }
272:                } catch (Exception e) {
273:                    log("Exception during regexMap processing: ", e);
274:                }
275:
276:                // log("regex: result = " + result);
277:                return result;
278:            }
279:
280:            /**
281:             * Returns the character used to delineate multiple addresses.
282:             * 
283:             * @param targetString the string to parse
284:             * @return the character to tokenize on
285:             */
286:            private String getSeparator(String targetString) {
287:                return (targetString.indexOf(',') > -1 ? "," : (targetString
288:                        .indexOf(';') > -1 ? ";" : (targetString
289:                        .indexOf("regex:") > -1 ? "" : ":")));
290:            }
291:
292:            private static final java.util.Random random = new java.util.Random(); // Used to generate new mail names
293:
294:            /**
295:             * Create a unique new primary key name.
296:             *
297:             * @param mail the mail to use as the basis for the new mail name
298:             * @return a new name
299:             */
300:            private String newName(Mail mail) throws MessagingException {
301:                String oldName = mail.getName();
302:
303:                // Checking if the original mail name is too long, perhaps because of a
304:                // loop caused by a configuration error.
305:                // it could cause a "null pointer exception" in AvalonMailRepository much
306:                // harder to understand.
307:                if (oldName.length() > 76) {
308:                    int count = 0;
309:                    int index = 0;
310:                    while ((index = oldName.indexOf('!', index + 1)) >= 0) {
311:                        count++;
312:                    }
313:                    // It looks like a configuration loop. It's better to stop.
314:                    if (count > 7) {
315:                        throw new MessagingException(
316:                                "Unable to create a new message name: too long.  Possible loop in config.xml.");
317:                    } else {
318:                        oldName = oldName.substring(0, 76);
319:                    }
320:                }
321:
322:                StringBuffer nameBuffer = new StringBuffer(64).append(oldName)
323:                        .append("-!").append(random.nextInt(1048576));
324:                return nameBuffer.toString();
325:            }
326:        }
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