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<h1>Policies and Policy Managers</h1>
<div id="front-matter">
<div id="minitoc-area">
<ul class="minitoc">
<li>
<a href="#Policies">Policies</a>
</li>
<li>
<a href="#Policy+Managers">Policy Managers</a>
</li>
<li>
<a href="#Inheriting+Policy+Manager">Inheriting Policy Manager</a>
</li>
<li>
<a href="#File+Policy+Manager">File Policy Manager</a>
</li>
<li>
<a href="#Document+Policy+Manager+Wrapper">Document Policy Manager Wrapper</a>
</li>
<li>
<a href="#Sitemap+Policy+Manager">Sitemap Policy Manager</a>
</li>
</ul>
</div>
</div>
<a name="N1000E"></a><a name="Policies"></a>
<h2 class="h3">Policies</h2>
<div class="section">
<p>
A <span class="codefrag">Policy</span> assigns <span class="codefrag">Role</span>s to <span class="codefrag">Accreditable</span>s.
</p>
<p>
There is a common policy definition XML schema which is handled by the
<span class="codefrag">PolicyBuilder</span>. It can be used together with the
<span class="codefrag">FilePolicyManager</span> and the <span class="codefrag">SitemapPolicyManager</span>.
</p>
<p>Here is an example of a policy definition:</p>
<pre class="code">
&lt;policy xmlns="http://apache.org/cocoon/lenya/ac/1.0"&gt;
&lt;user id="lenya"&gt;
&lt;role id="editor"/&gt;
&lt;role id="reviewer"/&gt;
&lt;/group&gt;
&lt;group id="reviewer"&gt;
&lt;role id="reviewer"/&gt;
&lt;/group&gt;
&lt;ip-range id="localhost"&gt;
&lt;role id="editor"/&gt;
&lt;/ip-range&gt;
&lt;world&gt;
&lt;role id="visitor"/&gt;
&lt;/world&gt;
&lt;/policy&gt;
</pre>
</div>
<a name="N10033"></a><a name="Policy+Managers"></a>
<h2 class="h3">Policy Managers</h2>
<div class="section">
<p>A <em>PolicyManager</em> is used to resolve the policy for a certain URL.
Lenya ships with the following <em>PolicyManager</em>s:</p>
</div>
<a name="N10043"></a><a name="Inheriting+Policy+Manager"></a>
<h2 class="h3">Inheriting Policy Manager</h2>
<div class="section">
<p>This is an abstract base class. It merges the policies
of all steps in the URL. For each
URL, a <em>url policy</em> and a <em>subtree policy</em> can be defined.
The <em>InheritingPolicyManager</em> adds the credentials of</p>
<ul>
<li>the subtree policies for all parent directories of the requested page,</li>
<li>the subtree policy of the requested page, and</li>
<li>the url policy of the requested page.</li>
</ul>
<p>For instance, if the URL is <span class="codefrag">/lenya/news/index.html</span>, the
following policies are merged:</p>
<ul>
<li>subtree policy of <span class="codefrag">/</span>
</li>
<li>subtree policy of <span class="codefrag">/lenya</span>
</li>
<li>subtree policy of <span class="codefrag">/lenya/news</span>
</li>
<li>subtree policy of <span class="codefrag">/lenya/news/index.html</span>
</li>
<li>url policy of <span class="codefrag">/lenya/news/index.html</span>
</li>
</ul>
</div>
<a name="N10084"></a><a name="File+Policy+Manager"></a>
<h2 class="h3">File Policy Manager</h2>
<div class="section">
<p>The <em>FilePolicyManager</em> is an <em>InheritingPolicyManager</em>.
The policies are defined by policy files that are arranged as a
directory tree that reflects the URI space, e.g.:
</p>
<pre class="code">/subtree-policy.acml
/lenya/subtree-policy.acml
/lenya/news/index.html/subtree-policy.acml
/lenya/news/index.html/url-policy.acml</pre>
<p>If a certain policy file does not exist (like /lenya/news in the above example), an empty policy is used instead.</p>
<p>The <em>FilePolicyManager</em> needs a <span class="codefrag">directory</span> parameter
which contains a URL pointing to the policies directory:</p>
<pre class="code">&lt;policy-manager type="file"&gt;
&lt;parameter name="directory"
value="context:///lenya/pubs/mypub/config/ac/policies"/&gt;
&lt;/policy-manager&gt;</pre>
</div>
<a name="N100A8"></a><a name="Document+Policy+Manager+Wrapper"></a>
<h2 class="h3">Document Policy Manager Wrapper</h2>
<div class="section">
<p>This <em>InheritingPolicyManager</em> subclass is used together with another
<em>InheritingPolicyManager.</em>
It is able to apply a single policy to all versions of a document
(languages, print version, ...). E.&nbsp;g., if you define
</p>
<ul>
<li>
<span class="codefrag">/foo/bar/subtree-policy.xml</span>
</li>
</ul>
<p>
and you use the <em>DefaultDocumentBuilder</em>,
this policy is applied to the URLs
</p>
<ul>
<li>
<span class="codefrag">/foo/bar.html</span>
</li>
<li>
<span class="codefrag">/foo/bar_de.html</span>
</li>
<li>
<span class="codefrag">/foo/bar_en.print.html</span>
</li>
<li>...</li>
</ul>
<p>To configure the <em>DefaultDocumentBuilder</em>, just put the
declaration of the wrapped <em>PolicyManager</em> inside the
<em>DefaultDocumentBuilder</em> declaration:</p>
<pre class="code">&lt;policy-manager type="document"&gt;
&lt;policy-manager type="file"&gt;
&lt;parameter name="directory"
value="context:///lenya/pubs/mypub/config/ac/policies"/&gt;
&lt;/policy-manager&gt;
&lt;/policy-manager&gt;</pre>
</div>
<a name="N100E5"></a><a name="Sitemap+Policy+Manager"></a>
<h2 class="h3">Sitemap Policy Manager</h2>
<div class="section">
<p>The <em>SitemapPolicyManager</em> uses the policy sitemap to resolve the policy
for a certain URL. For this purpose it sends a request of the form
</p>
<pre class="code">cocoon://{publication-id}/policies{url}.acml
Example:
cocoon://mypub/policies/authoring/foo/bar_de.html.acml
</pre>
<p>
which is processed by <span class="codefrag">global-sitemap.xmap</span> and forwarded
to <span class="codefrag">lenya/pubs/{publication-id}/policies-sitemap.xmap</span>.
The request is supposed to return a valid policy XML document.
</p>
<p>The configuration of the <em>SitemapPolicyManager</em> is very simple:</p>
<pre class="code">&lt;policy-manager type="sitemap"/&gt;</pre>
</div>
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