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| <h1 class="page">Distributed James Server — Custom mail processing components</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When none of the matchers and mailets available in James allows us to implement what we want, extension |
| developers will have to write our own mailet and matcher in a separated maven project depending on James |
| Mailet API.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_writing_custom_mailetsmatchers"><a class="anchor" href="#_writing_custom_mailetsmatchers"></a>Writing custom mailets/matchers</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>We will write a <strong>IsDelayedForMoreThan</strong> matcher with a configurable delay. If the Sent Date of incoming |
| emails is older than specified delay, then the emails should be matched (return all mail recipients). Otherwise, |
| we just return an empty list of recipients.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To ease our Job, we can rely on the <strong>org.apache.james.apache-mailet-base</strong> maven project, which provides us |
| a <strong>GenericMatcher</strong> that we can extend.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Here is the dependency:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre><dependency> |
| <groupId>org.apache.james</groupId> |
| <artifactId>apache-mailet-base</artifactId> |
| </dependency></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The main method of a matcher is the <strong>match</strong> method:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Collection<MailAddress> match(Mail mail) throws MessagingException;</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>For us, it becomes, with <strong>maxDelay</strong> being previously configured:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>private final Clock clock; |
| private Duration maxDelay; |
| |
| @Override |
| public Collection<MailAddress> match(Mail mail) throws MessagingException { |
| Date sentDate = mail.getMessage().getSentDate(); |
| |
| if (clock.instant().isAfter(sentDate.toInstant().plusMillis(maxDelay.toMillis()))) { |
| return ImmutableList.copyOf(mail.getRecipients()); |
| } |
| return ImmutableList.of(); |
| }</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><strong>GenericMatcher</strong> exposes us the condition that had been configured. We will use it to compute <strong>maxDelay</strong>. |
| We can do it in the <strong>init()</strong> method exposed by the generic matcher:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>public static final TimeConverter.Unit DEFAULT_UNIT = TimeConverter.Unit.HOURS; |
| |
| @Override |
| public void init() { |
| String condition = getCondition(); |
| maxDelay = Duration.ofMillis(TimeConverter.getMilliSeconds(condition, DEFAULT_UNIT)); |
| }</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Now, let’s take a look at the <strong>SendPromotionCode</strong> mailet. Of course, we want to write a generic mailet |
| with a configurable reason (why are we sending the promotion code). To keep things simple, only one promotion |
| code will be used, and will be written in the configuration. We can here also simply extend the |
| <strong>GenericMailet</strong> helper class.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The main method of a mailet is the <strong>service</strong> method:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>void service(Mail mail) throws MessagingException;</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>For us, it becomes, with <strong>reason</strong> and <strong>promotionCode</strong> being previously configured:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>public static final boolean REPLY_TO_SENDER_ONLY = false; |
| |
| private String reason; |
| private String promotionCode; |
| |
| @Override |
| public void service(Mail mail) throws MessagingException { |
| MimeMessage response = (MimeMessage) mail.getMessage() |
| .reply(REPLY_TO_SENDER_ONLY); |
| |
| response.setText(reason + "\n\n" + |
| "Here is the following promotion code that you can use on your next order: " + promotionCode); |
| |
| MailAddress sender = getMailetContext().getPostmaster(); |
| ImmutableList<MailAddress> recipients = ImmutableList.of(mail.getSender()); |
| |
| getMailetContext() |
| .sendMail(sender, recipients, response); |
| }</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Note that we can interact with the mail server through the mailet context for sending mails, knowing postmaster, etc…​</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>GenericMailet</strong> exposes us the 'init parameters' that had been configured for this mailet. We will |
| use it to retrieve <strong>reason</strong> and <strong>promotionCode</strong>. |
| We can do it in the <strong>init()</strong> method exposed by the generic mailet:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>@Override |
| public void init() throws MessagingException { |
| reason = getInitParameter("reason"); |
| promotionCode = getInitParameter("promotionCode"); |
| |
| if (Strings.isNullOrEmpty(reason)) { |
| throw new MessagingException("'reason' is compulsory"); |
| } |
| if (Strings.isNullOrEmpty(promotionCode)) { |
| throw new MessagingException("'promotionCode' is compulsory"); |
| } |
| }</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>You can retrieve the sources of this mini-project on <a href="https://github.com/apache/james-project/tree/master/examples/custom-mailets">GitHub</a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_loading_custom_mailets_with_james"><a class="anchor" href="#_loading_custom_mailets_with_james"></a>Loading custom mailets with James</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Now is the time we will run James with our awesome matcher and mailet configured.</p> |
| </div> |
| <div class="paragraph"> |
| <p>First, we will need to compile our project with <strong>mvn clean install</strong>. A jar will be outputted in the target directory.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Then, we will write the <strong>mailetcontainer.xml</strong> file expressing the logic we want:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre><mailetcontainer enableJmx="true"> |
| |
| <context> |
| <postmaster>postmaster@localhost</postmaster> |
| </context> |
| |
| <spooler> |
| <threads>20</threads> |
| </spooler> |
| |
| <processors> |
| <processor state="root" enableJmx="true"> |
| <mailet match="All" class="PostmasterAlias"/> |
| <mailet match="org.apache.james.examples.custom.mailets.IsDelayedForMoreThan=1 day" |
| class="org.apache.james.examples.custom.mailets.SendPromotionCode"> |
| <reason>Your email had been delayed for a long time. Because we are sorry about it, please find the |
| following promotion code.</reason> |
| <promotionCode>1542-2563-5469</promotionCode> |
| </mailet> |
| <!-- Rest of the configuration --> |
| </processor> |
| |
| <!-- Other processors --> |
| </processors> |
| </mailetcontainer></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Finally, we will start a James server using that. We will rely on docker default image for simplicity. |
| We need to be using the <strong>mailetcontainer.xml</strong> configuration that we had been writing and position |
| the jar in the <strong>extensions-jars</strong> folder (specific to guice).</p> |
| </div> |
| </div> |
| </div> |
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