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<sect1 id="zend.service.akismet">
    <title>Zend_Service_Akismet</title>

    <sect2 id="zend.service.akismet.introduction">
        <title>Introduction</title>

        <para>
            <classname>Zend_Service_Akismet</classname> provides a client for the <ulink
                url="http://akismet.com/development/api/">Akismet <acronym>API</acronym></ulink>.
            The Akismet service is used to determine if incoming data is
            potentially spam. It also exposes methods for submitting data as
            known spam or as false positives (ham). It was originally intended to help
            categorize and identify spam for Wordpress, but it can be used for any
            type of data.
        </para>

        <para>
            Akismet requires an <acronym>API</acronym> key for usage. You can get one by signing
            up for a <ulink url="http://wordpress.com/">WordPress.com</ulink>
            account. You do not need to activate a blog. Simply acquiring the
            account will provide you with the <acronym>API</acronym> key.
        </para>

        <para>
            Akismet requires that all requests contain a <acronym>URL</acronym> to
            the resource for which data is being filtered. Because of
            Akismet's origins in WordPress, this resource is called the blog
            <acronym>URL</acronym>. This value should be passed as the second argument to the
            constructor, but may be reset at any time using the
            <methodname>setBlogUrl()</methodname> method, or overridden by specifying a
            'blog' key in the various method calls.
        </para>
    </sect2>

    <sect2 id="zend.service.akismet.verifykey">
        <title>Verify an API key</title>

        <para>
            <methodname>Zend_Service_Akismet::verifyKey($key)</methodname> is used to
            verify that an Akismet <acronym>API</acronym> key is valid. In most cases, you
            will not need to check, but if you need a sanity check, or
            to determine if a newly acquired key is active, you may do
            so with this method.
        </para>

        <programlisting language="php"><![CDATA[
// Instantiate with the API key and a URL to the application or
// resource being used
$akismet = new Zend_Service_Akismet($apiKey,
                                    'http://framework.zend.com/wiki/');
if ($akismet->verifyKey($apiKey) {
    echo "Key is valid.\n";
} else {
    echo "Key is not valid\n";
}
]]></programlisting>

        <para>
            If called with no arguments, <methodname>verifyKey()</methodname> uses
            the <acronym>API</acronym> key provided to the constructor.
        </para>

        <para>
            <methodname>verifyKey()</methodname> implements Akismet's
            <code>verify-key</code> REST method.
        </para>
    </sect2>

    <sect2 id="zend.service.akismet.isspam">
        <title>Check for spam</title>

        <para>
            <methodname>Zend_Service_Akismet::isSpam($data)</methodname> is used to
            determine if the data provided is considered spam by
            Akismet. It accepts an associative array as the sole
            argument. That array requires the following keys be set:
        </para>

        <itemizedlist>
            <listitem>
                <para>
                    <code>user_ip</code>, the IP address of the user
                    submitting the data (not your IP address, but that
                    of a user on your site).
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>user_agent</code>, the reported UserAgent
                    string (browser and version) of the user submitting
                    the data.
                </para>
            </listitem>
        </itemizedlist>

        <para>
            The following keys are also recognized specifically by the
            <acronym>API</acronym>:
        </para>

        <itemizedlist>
            <listitem>
                <para>
                    <code>blog</code>, the fully qualified <acronym>URL</acronym> to the
                    resource or application. If not specified, the <acronym>URL</acronym>
                    provided to the constructor will be used.
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>referrer</code>, the content of the
                    HTTP_REFERER header at the time of submission. (Note
                    spelling; it does not follow the header name.)
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>permalink</code>, the permalink location, if
                    any, of the entry the data was submitted to.
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>comment_type</code>, the type of data
                    provided. Values specified in the <acronym>API</acronym>
                    include 'comment', 'trackback', 'pingback', and an
                    empty string (''), but it may be any value.
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>comment_author</code>, the name of the person
                    submitting the data.
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>comment_author_email</code>, the email of the
                    person submitting the data.
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>comment_author_url</code>, the <acronym>URL</acronym> or home page of the
                    person submitting the data.
                </para>
            </listitem>

            <listitem>
                <para>
                    <code>comment_content</code>, the actual data content
                    submitted.
                </para>
            </listitem>
        </itemizedlist>

        <para>
            You may also submit any other environmental variables you
            feel might be a factor in determining if data is spam.
            Akismet suggests the contents of the entire $_SERVER array.
        </para>

        <para>
            The <methodname>isSpam()</methodname> method will return either
            <constant>TRUE</constant> or <constant>FALSE</constant>, or throw an exception if the
            <acronym>API</acronym> key is invalid.
        </para>

        <example id="zend.service.akismet.isspam.example-1">
            <title>isSpam() Usage</title>

            <programlisting language="php"><![CDATA[
$data = array(
    'user_ip'              => '111.222.111.222',
    'user_agent'           => 'Mozilla/5.0 ' . (Windows; U; Windows NT ' .
                              '5.2; en-GB; rv:1.8.1) Gecko/20061010 ' .
                              'Firefox/2.0',
    'comment_type'         => 'contact',
    'comment_author'       => 'John Doe',
    'comment_author_email' => 'nospam@myhaus.net',
    'comment_content'      => "I'm not a spammer, honest!"
);
if ($akismet->isSpam($data)) {
    echo "Sorry, but we think you're a spammer.";
} else {
    echo "Welcome to our site!";
}
]]></programlisting>
        </example>

        <para>
            <methodname>isSpam()</methodname> implements the <code>comment-check</code>
            Akismet <acronym>API</acronym> method.
        </para>
    </sect2>

    <sect2 id="zend.service.akismet.submitspam">
        <title>Submitting known spam</title>

        <para>
            Spam data will occasionally get through the filter. If you discover spam that you feel
            should have been caught, you can submit it to Akismet to help improve their filter.
        </para>

        <para>
            <methodname>Zend_Service_Akismet::submitSpam()</methodname> takes the same data
            array as passed to <methodname>isSpam()</methodname>, but does not return a
            value. An exception will be raised if the <acronym>API</acronym> key used is invalid.
        </para>

        <example id="zend.service.akismet.submitspam.example-1">
            <title>submitSpam() Usage</title>

            <programlisting language="php"><![CDATA[
$data = array(
    'user_ip'              => '111.222.111.222',
    'user_agent'           => 'Mozilla/5.0 (Windows; U; Windows NT 5.2;' .
                              'en-GB; rv:1.8.1) Gecko/20061010 Firefox/2.0',
    'comment_type'         => 'contact',
    'comment_author'       => 'John Doe',
    'comment_author_email' => 'nospam@myhaus.net',
    'comment_content'      => "I'm not a spammer, honest!"
);
$akismet->submitSpam($data));
]]></programlisting>
        </example>

        <para>
            <methodname>submitSpam()</methodname> implements the <code>submit-spam</code>
            Akismet <acronym>API</acronym> method.
        </para>
    </sect2>

    <sect2 id="zend.service.akismet.submitham">
        <title>Submitting false positives (ham)</title>

        <para>
            Data will occasionally be trapped erroneously as spam by Akismet. For this reason,
            you should probably keep a log of all data trapped as spam by Akismet and review it
            periodically. If you find such occurrences, you can submit the data to Akismet as
            "ham", or a false positive (ham is good, spam is not).
        </para>

        <para>
            <methodname>Zend_Service_Akismet::submitHam()</methodname> takes the same data
            array as passed to <methodname>isSpam()</methodname> or
            <methodname>submitSpam()</methodname>, and, like <methodname>submitSpam()</methodname>,
            does not return a value. An exception will be raised if the <acronym>API</acronym> key
            used is invalid.
        </para>

        <example id="zend.service.akismet.submitham.example-1">
            <title>submitHam() Usage</title>

            <programlisting language="php"><![CDATA[
$data = array(
    'user_ip'              => '111.222.111.222',
    'user_agent'           => 'Mozilla/5.0 (Windows; U; Windows NT 5.2;' .
                              'en-GB; rv:1.8.1) Gecko/20061010 Firefox/2.0',
    'comment_type'         => 'contact',
    'comment_author'       => 'John Doe',
    'comment_author_email' => 'nospam@myhaus.net',
    'comment_content'      => "I'm not a spammer, honest!"
);
$akismet->submitHam($data));
]]></programlisting>
        </example>

        <para>
            <methodname>submitHam()</methodname> implements the <code>submit-ham</code>
            Akismet <acronym>API</acronym> method.
        </para>
    </sect2>

    <sect2 id="zend.service.akismet.accessors">
        <title>Zend-specific Methods</title>

        <para>
            While the Akismet <acronym>API</acronym> only specifies four methods,
            <classname>Zend_Service_Akismet</classname> has several additional methods
            that may be used for retrieving and modifying internal properties.
        </para>

        <itemizedlist>
            <listitem>
                <para>
                    <methodname>getBlogUrl()</methodname> and <methodname>setBlogUrl()</methodname>
                    allow you to retrieve and modify the blog <acronym>URL</acronym> used in
                    requests.
                </para>
            </listitem>

            <listitem>
                <para>
                    <methodname>getApiKey()</methodname> and <methodname>setApiKey()</methodname>
                    allow you to retrieve and modify the <acronym>API</acronym> key used in
                    requests.
                </para>
            </listitem>

            <listitem>
                <para>
                    <methodname>getCharset()</methodname> and <methodname>setCharset()</methodname>
                    allow you to retrieve and modify the character set used to make the request.
                </para>
            </listitem>

            <listitem>
                <para>
                    <methodname>getPort()</methodname> and <methodname>setPort()</methodname>
                    allow you to retrieve and modify the <acronym>TCP</acronym> port used to make
                    the request.
                </para>
            </listitem>

            <listitem>
                <para>
                    <methodname>getUserAgent()</methodname> and
                    <methodname>setUserAgent()</methodname> allow you to retrieve and modify the
                    <acronym>HTTP</acronym> user agent used to make the request. Note: this is not
                    the user_agent used in data submitted to the service, but rather the value
                    provided in the <acronym>HTTP</acronym> User-Agent header when making a request
                    to the service.
                </para>

                <para>
                    The value used to set the user agent should be of the form
                    <code>some user agent/version | Akismet/version</code>. The default is
                    <code>Zend Framework/ZF-VERSION | Akismet/1.11</code>, where
                    <code>ZF-VERSION</code> is the current Zend Framework version as stored in the
                    <constant>Zend_Framework::VERSION</constant> constant.
                </para>
            </listitem>
        </itemizedlist>
    </sect2>
</sect1>
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