Improve RenderArrayBase::getAccessResult() documentation
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3528675. -->
Reported by: [prudloff](https://www.drupal.org/user/3611858)
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>If I understand correctly RenderArrayBase::getAccessResult() mimics how #access only has 2 states (allowed and not allowed). So it transforms forbidden access results to neutral.</p>
<p>The method description does not explain that so it could be confusing and could be a security problem if misused.</p>
<p>(This was originally logged as a private issue to the security team, but was cleared to be moved to the public queue.) </p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> $renderArray </span><span style="color: #007700">= [<br> </span><span style="color: #DD0000">'#markup' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'foo'</span><span style="color: #007700">,<br> </span><span style="color: #DD0000">'#access' </span><span style="color: #007700">=> </span><span style="color: #0000BB">AccessResult</span><span style="color: #007700">::</span><span style="color: #0000BB">forbidden</span><span style="color: #007700">(</span><span style="color: #DD0000">'Nobody should be able to see this element.'</span><span style="color: #007700">),<br> ];<br> </span><span style="color: #0000BB">$renderArrayObject </span><span style="color: #007700">= </span><span style="color: #0000BB">RenderArray</span><span style="color: #007700">::</span><span style="color: #0000BB">alter</span><span style="color: #007700">(</span><span style="color: #0000BB">$renderArray</span><span style="color: #007700">);<br><br> </span><span style="color: #FF8000">// This is AccessResultForbidden.<br> </span><span style="color: #0000BB">$renderArray</span><span style="color: #007700">[</span><span style="color: #DD0000">'#access'</span><span style="color: #007700">];<br><br> </span><span style="color: #FF8000">// But this is AccessResultNeutral<br> </span><span style="color: #0000BB">$renderArrayObject</span><span style="color: #007700">-></span><span style="color: #0000BB">getAccessResult</span><span style="color: #007700">();<br><br> </span><span style="color: #FF8000">// This is AccessResultForbidden.<br> </span><span style="color: #0000BB">$renderArray</span><span style="color: #007700">[</span><span style="color: #DD0000">'#access'</span><span style="color: #007700">]-></span><span style="color: #0000BB">orIf</span><span style="color: #007700">(</span><span style="color: #0000BB">AccessResult</span><span style="color: #007700">::</span><span style="color: #0000BB">allowed</span><span style="color: #007700">());<br><br> </span><span style="color: #FF8000">// This becomes AccessResultAllowed.<br> </span><span style="color: #0000BB">$renderArrayObject</span><span style="color: #007700">-></span><span style="color: #0000BB">getAccessResult</span><span style="color: #007700">()-></span><span style="color: #0000BB">orIf</span><span style="color: #007700">(</span><span style="color: #0000BB">AccessResult</span><span style="color: #007700">::</span><span style="color: #0000BB">allowed</span><span style="color: #007700">());<br></span><span style="color: #0000BB">?></span></span></pre></div>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Expand the method documentation to explain how it transforms the access result.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
issue
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