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  <div class="section" id="module-repoze.what.adapters">
<span id="how-to-manage-groups-and-permission-sources"></span><h1>How to manage groups and permission sources<a class="headerlink" href="#module-repoze.what.adapters" title="Permalink to this headline"></a></h1>
<div class="topic">
<p class="topic-title first">Overview</p>
<p>It&#8217;s possible for you to manage your groups and permissions under a
<a class="reference internal" href="GettingStarted.html#term-source"><em class="xref std std-term">source</em></a>-independent API and here you will learn how to do it.</p>
</div>
<p><a class="reference internal" href="GettingStarted.html#term-source-adapter"><em class="xref std std-term">Source adapters</em></a> enable you to
retrieve information from your <a class="reference internal" href="GettingStarted.html#term-group-source"><em class="xref std std-term">groups</em></a> and
<a class="reference internal" href="GettingStarted.html#term-permission-source"><em class="xref std std-term">permissions</em></a>, as well as manage them, under an API
absolutely independent of the source type. You may take advantage
of this functionality to manage your sources from your own application or to
write an application-independent front-end to manage groups and permissions
in arbitrary WSGI applications using <a class="reference internal" href="../index.html#module-repoze.what" title="repoze.what: Authorization framework for WSGI applications"><tt class="xref py py-mod docutils literal"><span class="pre">repoze.what</span></tt></a>.</p>
<p>This functionality will also enable you to switch from one back-end to another
with no need to update your code (except for the part where you instance the
source adapter).</p>
<div class="section" id="managing-your-sources">
<h2>Managing your sources<a class="headerlink" href="#managing-your-sources" title="Permalink to this headline"></a></h2>
<p>Sources are managed from their respective adapters. For example, to manage the
groups defined in a database, you can use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.plugins.sql</span> <span class="kn">import</span> <span class="n">SqlGroupsAdapter</span>
<span class="kn">from</span> <span class="nn">your_model</span> <span class="kn">import</span> <span class="n">User</span><span class="p">,</span> <span class="n">Group</span><span class="p">,</span> <span class="n">DBSession</span>

<span class="n">groups</span> <span class="o">=</span> <span class="n">SqlGroupsAdapter</span><span class="p">(</span><span class="n">Group</span><span class="p">,</span> <span class="n">User</span><span class="p">,</span> <span class="n">DBSession</span><span class="p">)</span>
</pre></div>
</div>
<p>Or to manage the permissions defined in an XML file, you could use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.plugins.xml</span> <span class="kn">import</span> <span class="n">XMLGroupsAdapter</span>

<span class="n">permissions</span> <span class="o">=</span> <span class="n">XMLGroupsAdapter</span><span class="p">(</span><span class="s">&#39;/path/to/permissions.xml&#39;</span><span class="p">)</span>
</pre></div>
</div>
<div class="admonition tip">
<p class="first admonition-title">Tip</p>
<p>As of v1.0.1, you can re-use the same adapters used by <a class="reference internal" href="../index.html#module-repoze.what" title="repoze.what: Authorization framework for WSGI applications"><tt class="xref py py-mod docutils literal"><span class="pre">repoze.what</span></tt></a>
to control access. You will find them in the WSGI environment:</p>
<div class="last highlight-python"><div class="highlight"><pre><span class="c"># This is where repoze.what adapters are kept:</span>
<span class="n">adapters</span> <span class="o">=</span> <span class="n">environ</span><span class="p">[</span><span class="s">&#39;repoze.what.adapters&#39;</span><span class="p">]</span>

<span class="c"># Now let&#39;s extract the group and permission adapters:</span>
<span class="n">group_adapters</span> <span class="o">=</span> <span class="n">adapters</span><span class="p">[</span><span class="s">&#39;groups&#39;</span><span class="p">]</span>
<span class="n">permission_adapters</span> <span class="o">=</span> <span class="n">adapters</span><span class="p">[</span><span class="s">&#39;permissions&#39;</span><span class="p">]</span>
</pre></div>
</div>
</div>
<div class="section" id="retrieving-all-the-available-sections-from-a-source">
<h3>Retrieving all the available <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">sections</em></a> from a source<a class="headerlink" href="#retrieving-all-the-available-sections-from-a-source" title="Permalink to this headline"></a></h3>
<p>To get all the groups from the group source above, you may use the code below,
which will return a dictionary whose keys are the name of the groups and the
items are the username of the users that belong to such groups:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">get_all_sections</span><span class="p">()</span>
<span class="go">{u&#39;admins&#39;: set([u&#39;gustavo&#39;, u&#39;adolfo&#39;]), u&#39;developers&#39;: set([u&#39;narea&#39;])}</span>
</pre></div>
</div>
<p>And to get all the permissions from the permission source above, you may use
the code below, which will return a dictionary whose keys are the name of the
permissions and the items are the name of the groups that are granted such
permissions:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">get_all_sections</span><span class="p">()</span>
<span class="go">{u&#39;upload-images&#39;: set([u&#39;admins&#39;, u&#39;developers&#39;]), u&#39;write-post&#39;: set()}</span>
</pre></div>
</div>
</div>
<div class="section" id="retrieving-all-the-items-from-a-given-section">
<h3>Retrieving all the <a class="reference internal" href="GettingStarted.html#term-item"><em class="xref std std-term">items</em></a> from a given <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">section</em></a><a class="headerlink" href="#retrieving-all-the-items-from-a-given-section" title="Permalink to this headline"></a></h3>
<p>To get all the users that belong to a given group in the group source above,
you may use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">get_section_items</span><span class="p">(</span><span class="s">u&#39;admins&#39;</span><span class="p">)</span>
<span class="go">set([u&#39;gustavo&#39;, u&#39;adolfo&#39;])</span>
</pre></div>
</div>
<p>And to get all the groups that are granted a given permission in the permission
source above:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">get_section_items</span><span class="p">(</span><span class="s">u&#39;upload-images&#39;</span><span class="p">)</span>
<span class="go">set([u&#39;admins&#39;, u&#39;developers&#39;])</span>
</pre></div>
</div>
</div>
<div class="section" id="setting-the-items-of-a-given-section">
<h3>Setting the <a class="reference internal" href="GettingStarted.html#term-item"><em class="xref std std-term">items</em></a> of a given <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">section</em></a><a class="headerlink" href="#setting-the-items-of-a-given-section" title="Permalink to this headline"></a></h3>
<p>To set the members of a given group in the group source above, you may use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">set_section_items</span><span class="p">(</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">u&#39;rms&#39;</span><span class="p">,</span> <span class="s">u&#39;guido&#39;</span><span class="p">])</span>
</pre></div>
</div>
<p>And to set the groups that are granted a given permission in the permission
source above:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">set_section_items</span><span class="p">(</span><span class="s">u&#39;write-post&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">u&#39;admins&#39;</span><span class="p">])</span>
</pre></div>
</div>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p><tt class="docutils literal"><span class="pre">set_section_items</span></tt> will <cite>override</cite> the previous set of items. See, for
example:</p>
<div class="last highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">get_all_sections</span><span class="p">()</span>
<span class="go">{u&#39;admins&#39;: set([u&#39;gustavo&#39;, u&#39;adolfo&#39;]), u&#39;developers&#39;: set([u&#39;narea&#39;])}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">set_section_items</span><span class="p">(</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">u&#39;rms&#39;</span><span class="p">,</span> <span class="s">u&#39;guido&#39;</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">get_all_sections</span><span class="p">()</span>
<span class="go">{u&#39;admins&#39;: set([u&#39;rms&#39;, u&#39;guido&#39;]), u&#39;developers&#39;: set([u&#39;narea&#39;])}</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="including-items-in-a-section">
<h3>Including <a class="reference internal" href="GettingStarted.html#term-item"><em class="xref std std-term">items</em></a> in a <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">section</em></a><a class="headerlink" href="#including-items-in-a-section" title="Permalink to this headline"></a></h3>
<p>To add one the item to a given group of the group source above, you may use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">include_item</span><span class="p">(</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="s">u&#39;rms&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>Or to include many users at once:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">include_items</span><span class="p">(</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">u&#39;rms&#39;</span><span class="p">,</span> <span class="s">u&#39;guido&#39;</span><span class="p">])</span>
</pre></div>
</div>
<p>And to grant a given permission to one group in the permission source above:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">include_item</span><span class="p">(</span><span class="s">u&#39;write-post&#39;</span><span class="p">,</span> <span class="s">u&#39;admins&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>Or to grant the same permission to many groups at once:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">include_items</span><span class="p">(</span><span class="s">u&#39;write-post&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="s">u&#39;developers&#39;</span><span class="p">])</span>
</pre></div>
</div>
</div>
<div class="section" id="excluding-items-from-a-section">
<h3>Excluding <a class="reference internal" href="GettingStarted.html#term-item"><em class="xref std std-term">items</em></a> from a <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">section</em></a><a class="headerlink" href="#excluding-items-from-a-section" title="Permalink to this headline"></a></h3>
<p>To remove one the items from a given group of the group source above, you may
use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">exclude_item</span><span class="p">(</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="s">u&#39;gustavo&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>Or to exclude many items at once:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">exclude_items</span><span class="p">(</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">u&#39;gustavo&#39;</span><span class="p">,</span> <span class="s">u&#39;adolfo&#39;</span><span class="p">])</span>
</pre></div>
</div>
<p>And to deny a given permission to one group in the permission source above:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">exclude_item</span><span class="p">(</span><span class="s">u&#39;upload-images&#39;</span><span class="p">,</span> <span class="s">u&#39;developers&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>Or to grant the same permission to many groups at once:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">exclude_items</span><span class="p">(</span><span class="s">u&#39;upload-images&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="s">u&#39;developers&#39;</span><span class="p">])</span>
</pre></div>
</div>
</div>
<div class="section" id="adding-a-section-to-a-source">
<h3>Adding a <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">section</em></a> to a <a class="reference internal" href="GettingStarted.html#term-source"><em class="xref std std-term">source</em></a><a class="headerlink" href="#adding-a-section-to-a-source" title="Permalink to this headline"></a></h3>
<p>To create a group in the group source above, you may use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">create_section</span><span class="p">(</span><span class="s">u&#39;designers&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>And to create a permission in the permission source above:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">create_section</span><span class="p">(</span><span class="s">u&#39;edit-post&#39;</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="renaming-a-section">
<h3>Renaming a <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">section</em></a><a class="headerlink" href="#renaming-a-section" title="Permalink to this headline"></a></h3>
<p>To rename a group in the group source above, you may use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">edit_section</span><span class="p">(</span><span class="s">u&#39;designers&#39;</span><span class="p">,</span> <span class="s">u&#39;graphic-designers&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>And to rename a permission in the permission source above:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">edit_section</span><span class="p">(</span><span class="s">u&#39;write-post&#39;</span><span class="p">,</span> <span class="s">u&#39;create-post&#39;</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="removing-a-section-from-a-source">
<h3>Removing a <a class="reference internal" href="GettingStarted.html#term-section"><em class="xref std std-term">section</em></a> from a <a class="reference internal" href="GettingStarted.html#term-source"><em class="xref std std-term">source</em></a><a class="headerlink" href="#removing-a-section-from-a-source" title="Permalink to this headline"></a></h3>
<p>To remove a group from the group source above, you may use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">delete_section</span><span class="p">(</span><span class="s">u&#39;developers&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>And to remove a permission from the permission source above:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">delete_section</span><span class="p">(</span><span class="s">u&#39;write-post&#39;</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="checking-whether-the-source-is-writable">
<h3>Checking whether the <a class="reference internal" href="GettingStarted.html#term-source"><em class="xref std std-term">source</em></a> is writable<a class="headerlink" href="#checking-whether-the-source-is-writable" title="Permalink to this headline"></a></h3>
<p>Some adapters may not support writting the source, or some source types may
be read-only (e.g., a source served over HTTP), or some source types may be
writable but the current source itself may be read-only (e.g., a read-only
file). For this reason, you should check whether you can write to the source
&#8211; You will get a <a class="reference internal" href="#repoze.what.adapters.SourceError" title="repoze.what.adapters.SourceError"><tt class="xref py py-class docutils literal"><span class="pre">SourceError</span></tt></a> exception if you try to write to a
read-only source.</p>
<p>To check whether the group source above is writable, you may use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">groups</span><span class="o">.</span><span class="n">is_writable</span>
<span class="go">True</span>
</pre></div>
</div>
<p>And to check whether the permission source above is writable:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">permissions</span><span class="o">.</span><span class="n">is_writable</span>
<span class="go">False</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="possible-problems">
<h2>Possible problems<a class="headerlink" href="#possible-problems" title="Permalink to this headline"></a></h2>
<p>While dealing with an adapter, the following exceptions may be raised if an
error occurs:</p>
<dl class="exception">
<dt id="repoze.what.adapters.AdapterError">
<em class="property">exception </em><tt class="descclassname">repoze.what.adapters.</tt><tt class="descname">AdapterError</tt><a class="headerlink" href="#repoze.what.adapters.AdapterError" title="Permalink to this definition"></a></dt>
<dd><p>Base exception for problems in the source adapters.</p>
<p>It&#8217;s never raised directly.</p>
</dd></dl>

<dl class="exception">
<dt id="repoze.what.adapters.SourceError">
<em class="property">exception </em><tt class="descclassname">repoze.what.adapters.</tt><tt class="descname">SourceError</tt><a class="headerlink" href="#repoze.what.adapters.SourceError" title="Permalink to this definition"></a></dt>
<dd><p>Exception for problems with the source itself.</p>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">If you are creating a <a class="reference internal" href="GettingStarted.html#term-source-adapter"><em class="xref std std-term">source adapter</em></a>, this is the only
exception you should raise.</p>
</div>
</dd></dl>

<dl class="exception">
<dt id="repoze.what.adapters.ExistingSectionError">
<em class="property">exception </em><tt class="descclassname">repoze.what.adapters.</tt><tt class="descname">ExistingSectionError</tt><a class="headerlink" href="#repoze.what.adapters.ExistingSectionError" title="Permalink to this definition"></a></dt>
<dd><p>Exception raised when trying to add an existing group.</p>
</dd></dl>

<dl class="exception">
<dt id="repoze.what.adapters.NonExistingSectionError">
<em class="property">exception </em><tt class="descclassname">repoze.what.adapters.</tt><tt class="descname">NonExistingSectionError</tt><a class="headerlink" href="#repoze.what.adapters.NonExistingSectionError" title="Permalink to this definition"></a></dt>
<dd><p>Exception raised when trying to use a non-existing group.</p>
</dd></dl>

<dl class="exception">
<dt id="repoze.what.adapters.ItemPresentError">
<em class="property">exception </em><tt class="descclassname">repoze.what.adapters.</tt><tt class="descname">ItemPresentError</tt><a class="headerlink" href="#repoze.what.adapters.ItemPresentError" title="Permalink to this definition"></a></dt>
<dd><p>Exception raised when trying to add an item to a group that already
contains it.</p>
</dd></dl>

<dl class="exception">
<dt id="repoze.what.adapters.ItemNotPresentError">
<em class="property">exception </em><tt class="descclassname">repoze.what.adapters.</tt><tt class="descname">ItemNotPresentError</tt><a class="headerlink" href="#repoze.what.adapters.ItemNotPresentError" title="Permalink to this definition"></a></dt>
<dd><p>Exception raised when trying to remove an item from a group that doesn&#8217;t
contain it.</p>
</dd></dl>

</div>
<div class="section" id="writing-your-own-source-adapters">
<h2>Writing your own source adapters<a class="headerlink" href="#writing-your-own-source-adapters" title="Permalink to this headline"></a></h2>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">It&#8217;s <cite>very</cite> unlikely that you&#8217;ll want to write a <a class="reference internal" href="GettingStarted.html#term-source-adapter"><em class="xref std std-term">source adapter</em></a>, so
if you get bored reading this section, it&#8217;s absolutely safe for you to skip
it and come back later if you <cite>ever</cite> need to create an adapter.</p>
</div>
<p>Both <a class="reference internal" href="GettingStarted.html#term-group-adapter"><em class="xref std std-term">group</em></a> and <a class="reference internal" href="GettingStarted.html#term-permission-adapter"><em class="xref std std-term">permission</em></a>
<a class="reference internal" href="GettingStarted.html#term-source-adapter"><em class="xref std std-term">adapters</em></a> must extend the abstract class
<a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter" title="repoze.what.adapters.BaseSourceAdapter"><tt class="xref py py-class docutils literal"><span class="pre">BaseSourceAdapter</span></tt></a>:</p>
<dl class="class">
<dt id="repoze.what.adapters.BaseSourceAdapter">
<em class="property">class </em><tt class="descclassname">repoze.what.adapters.</tt><tt class="descname">BaseSourceAdapter</tt><big>(</big><em>writable=True</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter" title="Permalink to this definition"></a></dt>
<dd><p>Base class for <a class="reference internal" href="GettingStarted.html#term-source-adapter"><em class="xref std std-term">source adapters</em></a>.</p>
<p>Please note that these abstract methods may only raise one exception:
<a class="reference internal" href="#repoze.what.adapters.SourceError" title="repoze.what.adapters.SourceError"><tt class="xref py py-class docutils literal"><span class="pre">SourceError</span></tt></a>, which is raised if there was a problem while dealing 
with the source. They may not raise other exceptions because they should not
validate anything but the source (not even the parameters they get).</p>
<dl class="attribute">
<dt>
<tt class="descname">is_writable = True</tt></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Type :</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
<p>Whether the adapter can write to the source.</p>
<p>If the source type handled by your adapter doesn&#8217;t support write
access, or if your adapter itself doesn&#8217;t support writting to the
source (yet), then you should set this value to <tt class="docutils literal"><span class="pre">False</span></tt> in the class
itself; it will get overriden if the <tt class="docutils literal"><span class="pre">writable</span></tt> parameter in 
<a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter.__init__" title="repoze.what.adapters.BaseSourceAdapter.__init__"><tt class="xref py py-meth docutils literal"><span class="pre">the</span> <span class="pre">contructor</span></tt></a> is set, unless you 
explicitly disable that parameter:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># ...</span>
<span class="k">class</span> <span class="nc">MyFakeAdapter</span><span class="p">(</span><span class="n">BaseSourceAdapter</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">__init__</span><span class="p">():</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">MyFakeAdapter</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">writable</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="c"># ...</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>If it&#8217;s <tt class="docutils literal"><span class="pre">False</span></tt>, then you don&#8217;t have to define the methods that
modify the source because they won&#8217;t be used:</p>
<ul class="last simple">
<li><a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter._include_items" title="repoze.what.adapters.BaseSourceAdapter._include_items"><tt class="xref py py-meth docutils literal"><span class="pre">_include_items()</span></tt></a></li>
<li><a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter._exclude_items" title="repoze.what.adapters.BaseSourceAdapter._exclude_items"><tt class="xref py py-meth docutils literal"><span class="pre">_exclude_items()</span></tt></a></li>
<li><a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter._create_section" title="repoze.what.adapters.BaseSourceAdapter._create_section"><tt class="xref py py-meth docutils literal"><span class="pre">_create_section()</span></tt></a></li>
<li><a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter._edit_section" title="repoze.what.adapters.BaseSourceAdapter._edit_section"><tt class="xref py py-meth docutils literal"><span class="pre">_edit_section()</span></tt></a></li>
<li><a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter._delete_section" title="repoze.what.adapters.BaseSourceAdapter._delete_section"><tt class="xref py py-meth docutils literal"><span class="pre">_delete_section()</span></tt></a></li>
</ul>
</div>
</dd></dl>

<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">Do not ever cache the results &#8211; that is <a class="reference internal" href="#repoze.what.adapters.BaseSourceAdapter" title="repoze.what.adapters.BaseSourceAdapter"><tt class="xref py py-class docutils literal"><span class="pre">BaseSourceAdapter</span></tt></a>&#8216;s
job. It requests a given datum once, not multiple times, thanks to
its internal cache.</p>
</div>
<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter.__init__">
<tt class="descname">__init__</tt><big>(</big><em>writable=True</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter.__init__" title="Permalink to this definition"></a></dt>
<dd><p>Run common setup for source adapters.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>writable</strong> (<em>bool</em>) &#8211; Whether the source is writable.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._get_all_sections">
<tt class="descname">_get_all_sections</tt><big>(</big><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._get_all_sections" title="Permalink to this definition"></a></dt>
<dd><p>Return all the sections found in the source.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">All the sections found in the source.</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">dict</td>
</tr>
<tr class="field-odd field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-odd field"><td>&nbsp;</td><td class="field-body">If there was a problem with the source while
retrieving the sections.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._get_section_items">
<tt class="descname">_get_section_items</tt><big>(</big><em>section</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._get_section_items" title="Permalink to this definition"></a></dt>
<dd><p>Return the items of the section called <tt class="docutils literal"><span class="pre">section</span></tt>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>section</strong> (<em>unicode</em>) &#8211; The name of the section to be fetched.</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">The items of the section.</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">set</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body">If there was a problem with the source while 
retrieving the section.</td>
</tr>
</tbody>
</table>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">When implementing this method, don&#8217;t check whether the
section really exists; that&#8217;s already done when this method is
called.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._find_sections">
<tt class="descname">_find_sections</tt><big>(</big><em>hint</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._find_sections" title="Permalink to this definition"></a></dt>
<dd><p>Return the sections that meet a given criteria.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>hint</strong> (<em>dict or unicode</em>) &#8211; repoze.what&#8217;s credentials dictionary or a group name.</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">The sections that meet the criteria.</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">tuple</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body">If there was a problem with the source while
retrieving the sections.</td>
</tr>
</tbody>
</table>
<p>This method depends on the type of adapter that is implementing it:</p>
<ul class="simple">
<li>If it&#8217;s a <tt class="docutils literal"><span class="pre">group</span></tt> source adapter, it returns the groups the 
authenticated user belongs to. In this case, hint represents
repoze.what&#8217;s credentials dict. Please note that hint is not an 
user name because some adapters may need something else to find the 
groups the authenticated user belongs to. For example, LDAP adapters 
need the full Distinguished Name (DN) in the credentials dict, or a 
given adapter may only need the email address, so the user name alone 
would be useless in both situations.</li>
<li>If it&#8217;s a <tt class="docutils literal"><span class="pre">permission</span></tt> source adapter, it returns the name of the
permissions granted to the group in question; here hint represents
the name of such a group.</li>
</ul>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._include_items">
<tt class="descname">_include_items</tt><big>(</big><em>section</em>, <em>items</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._include_items" title="Permalink to this definition"></a></dt>
<dd><p>Add <tt class="docutils literal"><span class="pre">items</span></tt> to the <tt class="docutils literal"><span class="pre">section</span></tt>, in the source.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>section</strong> (<em>unicode</em>) &#8211; The section to contain the items.</li>
<li><strong>items</strong> (<em>tuple</em>) &#8211; The new items of the section.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body"><p class="first last">If the items could not be added to the section.</p>
</td>
</tr>
</tbody>
</table>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">When implementing this method, don&#8217;t check whether the
section really exists or the items are already included; that&#8217;s 
already done when this method is called.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._exclude_items">
<tt class="descname">_exclude_items</tt><big>(</big><em>section</em>, <em>items</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._exclude_items" title="Permalink to this definition"></a></dt>
<dd><p>Remove <tt class="docutils literal"><span class="pre">items</span></tt> from the <tt class="docutils literal"><span class="pre">section</span></tt>, in the source.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>section</strong> (<em>unicode</em>) &#8211; The section that contains the items.</li>
<li><strong>items</strong> (<em>tuple</em>) &#8211; The items to be removed from section.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body"><p class="first last">If the items could not be removed from the section.</p>
</td>
</tr>
</tbody>
</table>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">When implementing this method, don&#8217;t check whether the
section really exists or the items are already included; that&#8217;s 
already done when this method is called.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._item_is_included">
<tt class="descname">_item_is_included</tt><big>(</big><em>section</em>, <em>item</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._item_is_included" title="Permalink to this definition"></a></dt>
<dd><p>Check whether <tt class="docutils literal"><span class="pre">item</span></tt> is included in <tt class="docutils literal"><span class="pre">section</span></tt>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>section</strong> (<em>unicode</em>) &#8211; The name of the item to look for.</li>
<li><strong>section</strong> &#8211; The name of the section that may include the item.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Whether the item is included in section or not.</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">bool</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body"><p class="first last">If there was a problem with the source.</p>
</td>
</tr>
</tbody>
</table>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">When implementing this method, don&#8217;t check whether the
section really exists; that&#8217;s already done when this method is
called.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._create_section">
<tt class="descname">_create_section</tt><big>(</big><em>section</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._create_section" title="Permalink to this definition"></a></dt>
<dd><p>Add <tt class="docutils literal"><span class="pre">section</span></tt> to the source.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>section</strong> (<em>unicode</em>) &#8211; The section name.</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body">If the section could not be added.</td>
</tr>
</tbody>
</table>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">When implementing this method, don&#8217;t check whether the
section already exists; that&#8217;s already done when this method is
called.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._edit_section">
<tt class="descname">_edit_section</tt><big>(</big><em>section</em>, <em>new_section</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._edit_section" title="Permalink to this definition"></a></dt>
<dd><p>Edit <tt class="docutils literal"><span class="pre">section</span></tt>&#8216;s properties.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>section</strong> (<em>unicode</em>) &#8211; The current name of the section.</li>
<li><strong>new_section</strong> (<em>unicode</em>) &#8211; The new name of the section.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body"><p class="first last">If the section could not be edited.</p>
</td>
</tr>
</tbody>
</table>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">When implementing this method, don&#8217;t check whether the
section really exists; that&#8217;s already done when this method is
called.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._delete_section">
<tt class="descname">_delete_section</tt><big>(</big><em>section</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._delete_section" title="Permalink to this definition"></a></dt>
<dd><p>Delete <tt class="docutils literal"><span class="pre">section</span></tt>.</p>
<p>It removes the <tt class="docutils literal"><span class="pre">section</span></tt> from the source.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>section</strong> (<em>unicode</em>) &#8211; The name of the section to be deleted.</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body">If the section could not be deleted.</td>
</tr>
</tbody>
</table>
<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last">When implementing this method, don&#8217;t check whether the
section really exists; that&#8217;s already done when this method is
called.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="repoze.what.adapters.BaseSourceAdapter._section_exists">
<tt class="descname">_section_exists</tt><big>(</big><em>section</em><big>)</big><a class="headerlink" href="#repoze.what.adapters.BaseSourceAdapter._section_exists" title="Permalink to this definition"></a></dt>
<dd><p>Check whether <tt class="docutils literal"><span class="pre">section</span></tt> is defined in the source.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>section</strong> (<em>unicode</em>) &#8211; The name of the section to check.</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">Whether the section is the defined in the source or not.</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
</tr>
<tr class="field-even field"><th class="field-name" colspan="2">Raises SourceError:</th></tr>
<tr class="field-even field"><td>&nbsp;</td><td class="field-body">If there was a problem with the source.</td>
</tr>
</tbody>
</table>
</dd></dl>

</dd></dl>

<div class="section" id="sample-source-adapters">
<h3>Sample <a class="reference internal" href="GettingStarted.html#term-source-adapter"><em class="xref std std-term">source adapters</em></a><a class="headerlink" href="#sample-source-adapters" title="Permalink to this headline"></a></h3>
<p>The following class illustrates how a <a class="reference internal" href="GettingStarted.html#term-group-adapter"><em class="xref std std-term">group adapter</em></a> may look like:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.adapters</span> <span class="kn">import</span> <span class="n">BaseSourceAdapter</span>

<span class="k">class</span> <span class="nc">FakeGroupSourceAdapter</span><span class="p">(</span><span class="n">BaseSourceAdapter</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Mock group source adapter&quot;&quot;&quot;</span>

    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">FakeGroupSourceAdapter</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span> <span class="o">=</span> <span class="p">{</span>
            <span class="s">u&#39;admins&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">([</span><span class="s">u&#39;rms&#39;</span><span class="p">]),</span>
            <span class="s">u&#39;developers&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">([</span><span class="s">u&#39;rms&#39;</span><span class="p">,</span> <span class="s">u&#39;linus&#39;</span><span class="p">]),</span>
            <span class="s">u&#39;trolls&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">([</span><span class="s">u&#39;sballmer&#39;</span><span class="p">]),</span>
            <span class="s">u&#39;python&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">(),</span>
            <span class="s">u&#39;php&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">()</span>
            <span class="p">}</span>

    <span class="k">def</span> <span class="nf">_get_all_sections</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span>

    <span class="k">def</span> <span class="nf">_get_section_items</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_find_sections</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">credentials</span><span class="p">):</span>
        <span class="n">username</span> <span class="o">=</span> <span class="n">credentials</span><span class="p">[</span><span class="s">&#39;repoze.what.userid&#39;</span><span class="p">]</span>
        <span class="k">return</span> <span class="nb">set</span><span class="p">([</span><span class="n">n</span> <span class="k">for</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">g</span><span class="p">)</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="o">.</span><span class="n">items</span><span class="p">()</span>
                    <span class="k">if</span> <span class="n">username</span> <span class="ow">in</span> <span class="n">g</span><span class="p">])</span>

    <span class="k">def</span> <span class="nf">_include_items</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">items</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span> <span class="o">|=</span> <span class="n">items</span>

    <span class="k">def</span> <span class="nf">_exclude_items</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">items</span><span class="p">):</span>
        <span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">items</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">_item_is_included</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">item</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_create_section</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>

    <span class="k">def</span> <span class="nf">_edit_section</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">new_section</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">new_section</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>
        <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_delete_section</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_section_exists</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="o">.</span><span class="n">has_key</span><span class="p">(</span><span class="n">section</span><span class="p">)</span>
</pre></div>
</div>
<p>And the following class illustrates how a <a class="reference internal" href="GettingStarted.html#term-permission-adapter"><em class="xref std std-term">permission adapter</em></a> may look
like:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.adapters</span> <span class="kn">import</span> <span class="n">BaseSourceAdapter</span>

<span class="k">class</span> <span class="nc">FakePermissionSourceAdapter</span><span class="p">(</span><span class="n">BaseSourceAdapter</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Mock permissions source adapter&quot;&quot;&quot;</span>

    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">FakePermissionSourceAdapter</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span> <span class="o">=</span> <span class="p">{</span>
            <span class="s">u&#39;see-site&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">([</span><span class="s">u&#39;trolls&#39;</span><span class="p">]),</span>
            <span class="s">u&#39;edit-site&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">([</span><span class="s">u&#39;admins&#39;</span><span class="p">,</span> <span class="s">u&#39;developers&#39;</span><span class="p">]),</span>
            <span class="s">u&#39;commit&#39;</span><span class="p">:</span> <span class="nb">set</span><span class="p">([</span><span class="s">u&#39;developers&#39;</span><span class="p">])</span>
            <span class="p">}</span>

    <span class="k">def</span> <span class="nf">_get_all_sections</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span>

    <span class="k">def</span> <span class="nf">_get_section_items</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_find_sections</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">group_name</span><span class="p">):</span>
        <span class="k">return</span> <span class="nb">set</span><span class="p">([</span><span class="n">n</span> <span class="k">for</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">p</span><span class="p">)</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="o">.</span><span class="n">items</span><span class="p">()</span>
                    <span class="k">if</span> <span class="n">group_name</span> <span class="ow">in</span> <span class="n">p</span><span class="p">])</span>

    <span class="k">def</span> <span class="nf">_include_items</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">items</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span> <span class="o">|=</span> <span class="n">items</span>

    <span class="k">def</span> <span class="nf">_exclude_items</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">items</span><span class="p">):</span>
        <span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">items</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">_item_is_included</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">item</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_create_section</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>

    <span class="k">def</span> <span class="nf">_edit_section</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">new_section</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">new_section</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>
        <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_delete_section</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="p">[</span><span class="n">section</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">_section_exists</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">section</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">fake_sections</span><span class="o">.</span><span class="n">has_key</span><span class="p">(</span><span class="n">section</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="module-repoze.what.adapters.testutil">
<span id="testing-your-source-adapters-with-testutil"></span><h3>Testing your source adapters with <a class="reference internal" href="#module-repoze.what.adapters.testutil" title="repoze.what.adapters.testutil: Automatic tests for repoze.what source adapters"><tt class="xref py py-mod docutils literal"><span class="pre">testutil</span></tt></a><a class="headerlink" href="#module-repoze.what.adapters.testutil" title="Permalink to this headline"></a></h3>
<p><a class="reference internal" href="../index.html#module-repoze.what" title="repoze.what: Authorization framework for WSGI applications"><tt class="xref py py-mod docutils literal"><span class="pre">repoze.what</span></tt></a> provides convenient utilities to automate the verification
of your adapters. This utility is the <a class="reference internal" href="#module-repoze.what.adapters.testutil" title="repoze.what.adapters.testutil: Automatic tests for repoze.what source adapters"><tt class="xref py py-mod docutils literal"><span class="pre">repoze.what.adapters.testutil</span></tt></a>
module, made up four test cases, which when extended must define the adapter
(as <tt class="docutils literal"><span class="pre">self.adapter</span></tt>) in the setup, as well as call this class&#8217; <tt class="docutils literal"><span class="pre">setUp()</span></tt>
method:</p>
<dl class="class">
<dt id="repoze.what.adapters.testutil.ReadOnlyGroupsAdapterTester">
<em class="property">class </em><tt class="descclassname">repoze.what.adapters.testutil.</tt><tt class="descname">ReadOnlyGroupsAdapterTester</tt><a class="headerlink" href="#repoze.what.adapters.testutil.ReadOnlyGroupsAdapterTester" title="Permalink to this definition"></a></dt>
<dd><p>Test case for read-only groups source adapters.</p>
<p>The groups source used for the tests must only contain the following
groups (aka &#8220;sections&#8221;) and their relevant users (aka &#8220;items&#8221;; if any):</p>
<ul>
<li><dl class="first docutils">
<dt>admins</dt>
<dd><ul class="first last simple">
<li>rms</li>
</ul>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>developers</dt>
<dd><ul class="first last simple">
<li>rms</li>
<li>linus</li>
</ul>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>trolls</dt>
<dd><ul class="first last simple">
<li>sballmer</li>
</ul>
</dd>
</dl>
</li>
<li><p class="first">python</p>
</li>
<li><p class="first">php</p>
</li>
</ul>
<dl class="attribute">
<dt id="repoze.what.adapters.testutil.ReadOnlyGroupsAdapterTester.adapter">
<tt class="descname">adapter</tt><a class="headerlink" href="#repoze.what.adapters.testutil.ReadOnlyGroupsAdapterTester.adapter" title="Permalink to this definition"></a></dt>
<dd><p>An instance of the <a class="reference internal" href="GettingStarted.html#term-group-adapter"><em class="xref std std-term">group adapter</em></a> to be tested.</p>
</dd></dl>

<p>For example, a test case for the mock group adapter
<tt class="docutils literal"><span class="pre">FakeReadOnlyGroupSourceAdapter</span></tt> may look like this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.adapters.testutil</span> <span class="kn">import</span> <span class="n">ReadOnlyGroupsAdapterTester</span>

<span class="k">class</span> <span class="nc">TestReadOnlyGroupsAdapterTester</span><span class="p">(</span><span class="n">ReadOnlyGroupsAdapterTester</span><span class="p">,</span> 
                                      <span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">TestReadOnlyGroupsAdapterTester</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">setUp</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">adapter</span> <span class="o">=</span> <span class="n">FakeReadOnlyGroupSourceAdapter</span><span class="p">()</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><a class="reference internal" href="#repoze.what.adapters.testutil.GroupsAdapterTester" title="repoze.what.adapters.testutil.GroupsAdapterTester"><tt class="xref py py-class docutils literal"><span class="pre">GroupsAdapterTester</span></tt></a> extends this test case to check write
operations.</p>
</div>
</dd></dl>

<dl class="class">
<dt id="repoze.what.adapters.testutil.ReadOnlyPermissionsAdapterTester">
<em class="property">class </em><tt class="descclassname">repoze.what.adapters.testutil.</tt><tt class="descname">ReadOnlyPermissionsAdapterTester</tt><a class="headerlink" href="#repoze.what.adapters.testutil.ReadOnlyPermissionsAdapterTester" title="Permalink to this definition"></a></dt>
<dd><p>Test case for read-only permissions source adapters.</p>
<p>The permissions source used for the tests must only contain the following
permissions (aka &#8220;sections&#8221;) and their relevant groups (aka &#8220;items&#8221;; if
any):</p>
<ul>
<li><dl class="first docutils">
<dt>see-site</dt>
<dd><ul class="first last simple">
<li>trolls</li>
</ul>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>edit-site</dt>
<dd><ul class="first last simple">
<li>admins</li>
<li>developers</li>
</ul>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>commit</dt>
<dd><ul class="first last simple">
<li>developers</li>
</ul>
</dd>
</dl>
</li>
</ul>
<dl class="attribute">
<dt id="repoze.what.adapters.testutil.ReadOnlyPermissionsAdapterTester.adapter">
<tt class="descname">adapter</tt><a class="headerlink" href="#repoze.what.adapters.testutil.ReadOnlyPermissionsAdapterTester.adapter" title="Permalink to this definition"></a></dt>
<dd><p>An instance of the <a class="reference internal" href="GettingStarted.html#term-permission-adapter"><em class="xref std std-term">permission adapter</em></a> to be tested.</p>
</dd></dl>

<p>For example, a test case for the mock permission adapter defined above
(<tt class="docutils literal"><span class="pre">FakeReadOnlyPermissionSourceAdapter</span></tt>) may look like this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.adapters.testutil</span> <span class="kn">import</span> <span class="n">ReadOnlyPermissionsAdapterTester</span>

<span class="k">class</span> <span class="nc">TestReadOnlyPermissionsAdapterTester</span><span class="p">(</span><span class="n">ReadOnlyPermissionsAdapterTester</span><span class="p">,</span>
                                           <span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">TestReadOnlyPermissionsAdapterTester</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">setUp</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">adapter</span> <span class="o">=</span> <span class="n">FakeReadOnlyPermissionSourceAdapter</span><span class="p">()</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><a class="reference internal" href="#repoze.what.adapters.testutil.PermissionsAdapterTester" title="repoze.what.adapters.testutil.PermissionsAdapterTester"><tt class="xref py py-class docutils literal"><span class="pre">PermissionsAdapterTester</span></tt></a> extends this test case to check write
operations.</p>
</div>
</dd></dl>

<dl class="class">
<dt id="repoze.what.adapters.testutil.GroupsAdapterTester">
<em class="property">class </em><tt class="descclassname">repoze.what.adapters.testutil.</tt><tt class="descname">GroupsAdapterTester</tt><a class="headerlink" href="#repoze.what.adapters.testutil.GroupsAdapterTester" title="Permalink to this definition"></a></dt>
<dd><p>Test case for groups source adapters.</p>
<p>This test case extends <a class="reference internal" href="#repoze.what.adapters.testutil.ReadOnlyGroupsAdapterTester" title="repoze.what.adapters.testutil.ReadOnlyGroupsAdapterTester"><tt class="xref py py-class docutils literal"><span class="pre">ReadOnlyGroupsAdapterTester</span></tt></a> to test
write operations in read &amp; write adapters and it should be set up the same
way as its parent. For example, a test case for the mock group adapter
<tt class="docutils literal"><span class="pre">FakeGroupSourceAdapter</span></tt> may look like this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.adapters.testutil</span> <span class="kn">import</span> <span class="n">GroupsAdapterTester</span>

<span class="k">class</span> <span class="nc">TestGroupsAdapterTester</span><span class="p">(</span><span class="n">GroupsAdapterTester</span><span class="p">,</span> <span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">TestGroupsAdapterTester</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">setUp</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">adapter</span> <span class="o">=</span> <span class="n">FakeGroupSourceAdapter</span><span class="p">()</span>
</pre></div>
</div>
</dd></dl>

<dl class="class">
<dt id="repoze.what.adapters.testutil.PermissionsAdapterTester">
<em class="property">class </em><tt class="descclassname">repoze.what.adapters.testutil.</tt><tt class="descname">PermissionsAdapterTester</tt><a class="headerlink" href="#repoze.what.adapters.testutil.PermissionsAdapterTester" title="Permalink to this definition"></a></dt>
<dd><p>Test case for permissions source adapters.</p>
<p>This test case extends <a class="reference internal" href="#repoze.what.adapters.testutil.ReadOnlyPermissionsAdapterTester" title="repoze.what.adapters.testutil.ReadOnlyPermissionsAdapterTester"><tt class="xref py py-class docutils literal"><span class="pre">ReadOnlyPermissionsAdapterTester</span></tt></a> to test
write operations in read &amp; write adapters and it should be set up the same
way as its parent. For example, a test case for the mock group adapter
<tt class="docutils literal"><span class="pre">FakePermissionSourceAdapter</span></tt> may look like this:</p>
<p>For example, a test case for the mock permission adapter defined above
(<tt class="docutils literal"><span class="pre">FakePermissionSourceAdapter</span></tt>) may look like this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">repoze.what.adapters.testutil</span> <span class="kn">import</span> <span class="n">PermissionsAdapterTester</span>

<span class="k">class</span> <span class="nc">TestPermissionsAdapterTester</span><span class="p">(</span><span class="n">PermissionsAdapterTester</span><span class="p">,</span>
                                   <span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">TestPermissionsAdapterTester</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">setUp</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">adapter</span> <span class="o">=</span> <span class="n">FakePermissionSourceAdapter</span><span class="p">()</span>
</pre></div>
</div>
</dd></dl>

<div class="admonition attention">
<p class="first admonition-title">Attention</p>
<p class="last"><a class="reference internal" href="#module-repoze.what.adapters.testutil" title="repoze.what.adapters.testutil: Automatic tests for repoze.what source adapters"><tt class="xref py py-mod docutils literal"><span class="pre">repoze.what.adapters.testutil</span></tt></a> is not a full replacement for a test
suite, so you are still highly encouraged to write the relevant/missing
tests to lead the code coverage of your adapters to 100%.</p>
</div>
</div>
</div>
</div>


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  <h3><a href="../index.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">How to manage groups and permission sources</a><ul>
<li><a class="reference internal" href="#managing-your-sources">Managing your sources</a><ul>
<li><a class="reference internal" href="#retrieving-all-the-available-sections-from-a-source">Retrieving all the available <tt class="docutils literal"><span class="pre">sections</span></tt> from a source</a></li>
<li><a class="reference internal" href="#retrieving-all-the-items-from-a-given-section">Retrieving all the <tt class="docutils literal"><span class="pre">items</span></tt> from a given <tt class="docutils literal"><span class="pre">section</span></tt></a></li>
<li><a class="reference internal" href="#setting-the-items-of-a-given-section">Setting the <tt class="docutils literal"><span class="pre">items</span></tt> of a given <tt class="docutils literal"><span class="pre">section</span></tt></a></li>
<li><a class="reference internal" href="#including-items-in-a-section">Including <tt class="docutils literal"><span class="pre">items</span></tt> in a <tt class="docutils literal"><span class="pre">section</span></tt></a></li>
<li><a class="reference internal" href="#excluding-items-from-a-section">Excluding <tt class="docutils literal"><span class="pre">items</span></tt> from a <tt class="docutils literal"><span class="pre">section</span></tt></a></li>
<li><a class="reference internal" href="#adding-a-section-to-a-source">Adding a <tt class="docutils literal"><span class="pre">section</span></tt> to a <tt class="docutils literal"><span class="pre">source</span></tt></a></li>
<li><a class="reference internal" href="#renaming-a-section">Renaming a <tt class="docutils literal"><span class="pre">section</span></tt></a></li>
<li><a class="reference internal" href="#removing-a-section-from-a-source">Removing a <tt class="docutils literal"><span class="pre">section</span></tt> from a <tt class="docutils literal"><span class="pre">source</span></tt></a></li>
<li><a class="reference internal" href="#checking-whether-the-source-is-writable">Checking whether the <tt class="docutils literal"><span class="pre">source</span></tt> is writable</a></li>
</ul>
</li>
<li><a class="reference internal" href="#possible-problems">Possible problems</a></li>
<li><a class="reference internal" href="#writing-your-own-source-adapters">Writing your own source adapters</a><ul>
<li><a class="reference internal" href="#sample-source-adapters">Sample <tt class="docutils literal"><span class="pre">source</span> <span class="pre">adapters</span></tt></a></li>
<li><a class="reference internal" href="#module-repoze.what.adapters.testutil">Testing your source adapters with <tt class="docutils literal"><span class="pre">testutil</span></tt></a></li>
</ul>
</li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
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