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author Robert Casties <casties@mpiwg-berlin.mpg.de>
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            <h1>Configuring digilib</h1>
<p>The main configuration for <i>digilib</i> is the XML file <tt>digilib-config.xml</tt> in the <tt>WEB-INF</tt> directory of the webapp. Alternatively you can also use a Java properties file <tt>digilib.properties</tt> somewhere in the classpath. (If you really need a different location for the XML file you can define it in the <tt>config-file</tt> init-parameter to the Servlet. <b>TODO</b> add an example)</p>
<p>In the configuration file you can set lots of paths and options. <i>digilib</i> uses default values for all configuration settings that meet most requirements. Hence you have to configure only the settings that you want to change. The <b><tt>basedir-list</tt></b> parameter however is <b>mandatory</b> unless you only want to serve the contributed example images for an evaluation.</p>
<p>All options are defined as <tt>parameter</tt> elements with the attributes <tt>name</tt> and <tt>value</tt> that are wrapped in the root element <tt>digilib-config</tt>. A minimal configuration looks like this:</p>

<div class="source">
<div class="source">
<pre>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;digilib-config&gt;
    &lt;parameter name=&quot;basedir-list&quot; value=&quot;/usr/local/images&quot; /&gt;
&lt;/digilib-config&gt;
</pre></div></div>
<p>A more extensive example is included in the sources as <a class="externalLink" href="https://github.com/robcast/digilib/blob/master/webapp/src/main/webapp/WEB-INF/digilib-config.xml.template">digilib-config.xml.template</a>.</p>
<div class="section">
<h2><a name="Available_parameters"></a>Available parameters</h2>
<p>The documented parameter values below are the defaults.</p>
<p>If relative paths are provided as file locations, these will be resolved with the web application&#x2019;s directory as base.</p>
<p>You can inspect a summary of your running digilib configuration at the URL <tt>&lt;base_url&gt;/server/dlConfig.jsp</tt>.</p>
<div class="section">
<h3><a name="Image_locations"></a>Image locations</h3>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;basedir-list&quot; value=&quot;sample-images&quot; /&gt;
</pre></div></div>
<p>A list of directories where images are searched. See <a href="image-directories.html">this document</a> for details.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;denied-image&quot; value=&quot;img/digilib-denied.png&quot; /&gt;
</pre></div></div>
<p>This image is sent to indicate an authorization failure.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;error-image&quot; value=&quot;img/digilib-error.png&quot; /&gt;
</pre></div></div>
<p>This image is sent to indicate a general failure.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;notfound-image&quot; value=&quot;img/digilib-notfound.png&quot; /&gt;
</pre></div></div>
<p>This image to sent to indicate that the requested image does not exist or could not be read.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;use-mapping&quot; value=&quot;false&quot; /&gt;
</pre></div></div>
<p>Enables the mapping of &#x2018;virtual directories&#x2019; to actual directories in the filesystem using a mapping file.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;mapping-file&quot; value=&quot;digilib-map.xml&quot; /&gt;
</pre></div></div>
<p>The location of the mapping file. Refer to <a class="externalLink" href="https://github.com/robcast/digilib/blob/master/webapp/src/main/webapp/WEB-INF/digilib-map.xml.template">digilib-map.xml.template</a> for an example. </p>
<p>The file contains <tt>mapping</tt> elements with a <tt>link</tt> attribute containing a &#x2018;virtual directory&#x2019; name that is mapped to the directory given in the <tt>dir</tt> attribute.</p></div>
<div class="section">
<h3><a name="Image_processing_options"></a>Image processing options</h3>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;default-quality&quot; value=&quot;2&quot; /&gt;
</pre></div></div>
<p>The default interpolation quality.</p>

<ul>
  
<li><tt>0</tt>: do not use interpolation (worst),</li>
  
<li><tt>1</tt>: use linear interpolation,</li>
  
<li><tt>2</tt>: use bilinear interpolation and blur-before-scale (best).</li>
</ul>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;max-image-size&quot; value=&quot;0&quot; /&gt;
</pre></div></div>
<p>The maximum size of delivered images as pixel area, <tt>40000</tt> means up to 200x200 or 100x400, <tt>0</tt> means no limit.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;sendfile-allowed&quot; value=&quot;true&quot; /&gt;
</pre></div></div>
<p>Defines whether requests with <tt>mo=file</tt> or <tt>mo=rawfile</tt> as parameter are allowed to download files (see <a href="scaler-api.html">Scaler API</a>).</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;subsample-minimum&quot; value=&quot;2.0&quot; /&gt;
</pre></div></div>
<p>Degree of subsampling on image load. This is the minimum factor that is scaled by interpolation and not by subsampling, i.e. by skipping pixels.</p></div>
<div class="section">
<h3><a name="Authentication_and_authorization"></a>Authentication and authorization</h3>
<p>Details are provided in the <a href="auth.html">documentation on authentication and authorization</a>.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;auth-file&quot; value=&quot;digilib-auth.xml&quot; /&gt;
</pre></div></div>
<p>Configuration file for authentication and authorization. The format and content of the configuration file is determined by the chosen authentication and authorization classes. </p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;authn-token-cookie&quot; value=&quot;id_token&quot; /&gt;
</pre></div></div>
<p>The name of the cookie that holds the authentication token for <tt>digilib.auth.OpenIdAuthnOps</tt>.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;authnops-class&quot; value=&quot;digilib.auth.IpAuthnOps&quot; /&gt;
</pre></div></div>
<p>The class to handle authentication.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;authzops-class&quot; value=&quot;digilib.auth.PathAuthzOps&quot; /&gt;
</pre></div></div>
<p>The class to handle authorization.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;use-authorization&quot; value=&quot;false&quot; /&gt;
</pre></div></div>
<p>Enable or disable all authorization. If <tt>use-authorization</tt> is <tt>true</tt> it also needs to be configured using <tt>authnops-class</tt> and <tt>authzops-class</tt> and the <tt>auth-file</tt>.</p></div>
<div class="section">
<h3><a name="IIIF_API_options"></a>IIIF API options</h3>
<p>The options configure the IIIF interface. For more information see the <a href="iiif-api">digilib IIIF documentation</a></p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;iiif-api-version&quot; value=&quot;2.1&quot; /&gt;
</pre></div></div>
<p>The IIIF API version for the generated <tt>info.json</tt> information response. </p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;iiif-info-cors&quot; value=&quot;true&quot; /&gt;
</pre></div></div>
<p>Enables the <tt>Cross-Origin Resource Sharing</tt> header in IIIF info requests.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;iiif-image-cors&quot; value=&quot;true&quot; /&gt;
</pre></div></div>
<p>Enables the <tt>Cross-Origin Resource Sharing</tt> header in IIIF image requests.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;iiif-prefix&quot; value=&quot;IIIF&quot; /&gt;
</pre></div></div>
<p>The prefix (after <tt>Scaler</tt>) that leads to the IIIF API.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;iiif-slash-replacement&quot; value=&quot;!&quot; /&gt;
</pre></div></div>
<p>The character that replaces a slash in the identifier of IIIF requests.</p></div>
<div class="section">
<h3><a name="Threading_options"></a>Threading options</h3>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;max-waiting-threads&quot; value=&quot;20&quot; /&gt;
</pre></div></div>
<p>The maximum number of requests waiting in the queue before sending &#x201c;service unavailable&#x201d;.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;worker-threads&quot; value=&quot;2&quot; /&gt;
</pre></div></div>
<p>The maximum number of concurrently working threads.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;worker-timeout&quot; value=&quot;60000&quot; /&gt;
</pre></div></div>
<p>Timeout for worker threads in milliseconds.</p></div>
<div class="section">
<h3><a name="Assorted_options"></a>Assorted options</h3>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;default-errmsg-type&quot; value=&quot;image&quot; /&gt;
</pre></div></div>
<p>Defines how errors are presented to the user. Allowed values are <tt>code</tt>, <tt>image</tt> and <tt>text</tt>.</p>

<ul>
  
<li><tt>image</tt> sends an error-image as error code (see <tt>denied-image</tt>, <tt>error-image</tt>, <tt>notfound-image</tt> parameters).</li>
  
<li><tt>code</tt> sends an HTTP error code, which may result in a broken image display in the browser.</li>
  
<li><tt>text</tt> sends a plain-text error message, which may result in a broken image display in the browser.</li>
</ul>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;img-diskcache-allowed&quot; value=&quot;false&quot; /&gt;
</pre></div></div>
<p>Enables the use of a disk cache for the image toolkit. Using the disk cache may leak file handles and lead to resource issues if digilib runs for a long time.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;log-config-file&quot; value=&quot;log4j-config.xml&quot; /&gt;
</pre></div></div>
<p>Location of the logging configuration file. The current logger is <a class="externalLink" href="https://logging.apache.org/log4j/1.2/manual.html">Log4J 1.2</a>.</p></div>
<div class="section">
<h3><a name="Unknown_category"></a>Unknown category</h3>
<p><b>TODO</b> move items to appropriate sections</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;dirmeta-class&quot; value=&quot;digilib.meta.IndexMetaDirMeta&quot; /&gt;
</pre></div></div>
<p>Class for <b>TODO</b>.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;docudirectory-class&quot; value=&quot;digilib.io.BaseDirDocuDirectory&quot; /&gt;
</pre></div></div>
<p>Class for <b>TODO</b>.</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;docuimage-class&quot; value=&quot;digilib.image.ImageLoaderDocuImage&quot; /&gt;
</pre></div></div>
<p>Class for the <tt>DocuImage</tt> instance, <b>TODO</b> elaborate intended use</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;docuimage-hacks&quot; value=&quot;&quot; /&gt;
</pre></div></div>
<p><b>TODO</b> elaborate</p>

<div class="source">
<div class="source">
<pre>&lt;parameter name=&quot;filemeta-class&quot; value=&quot;digilib.meta.IndexMetaFileMeta&quot; /&gt;
</pre></div></div>
<p>Class for <b>TODO</b>.</p></div></div>
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