Switch User: "This form is outdated. Reload the page and try again."
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #915620. -->
Reported by: [salvis](https://www.drupal.org/user/82964)
>>>
<p>Currently, all open forms (in other browser tabs) become unusable, if we switch to another user, even if we switch back before trying to resume using a form. This behavior is intentional if you log out and log in again, but not when switching users.</p>
<p>In <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/devel/-/work_items/881796" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/devel/-/work_items/881796</a></span> I introduced an unconditional call to drupal_session_regenerate(), and this is what's causing the problem.</p>
<p>This patch calls drupal_session_regenerate() <i>only when switching from anonymous to authenticated</i>, and AFAICS this allows using forms beyond user switches:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">function </span><span style="color: #0000BB">devel_switch_user</span><span style="color: #007700">(</span><span style="color: #0000BB">$name </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">) {<br> global </span><span style="color: #0000BB">$user</span><span style="color: #007700">;<br><br> if (</span><span style="color: #0000BB">$user</span><span style="color: #007700">-></span><span style="color: #0000BB">uid</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">module_invoke_all</span><span style="color: #007700">(</span><span style="color: #DD0000">'user_logout'</span><span style="color: #007700">, </span><span style="color: #0000BB">$user</span><span style="color: #007700">);<br> }<br> if (isset(</span><span style="color: #0000BB">$name</span><span style="color: #007700">) && </span><span style="color: #0000BB">$account </span><span style="color: #007700">= </span><span style="color: #0000BB">user_load_by_name</span><span style="color: #007700">(</span><span style="color: #0000BB">$name</span><span style="color: #007700">)) {<br> </span><span style="color: #0000BB">$old_uid </span><span style="color: #007700">= </span><span style="color: #0000BB">$user</span><span style="color: #007700">-></span><span style="color: #0000BB">uid</span><span style="color: #007700">;<br> </span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">$account</span><span style="color: #007700">;<br> if (!</span><span style="color: #0000BB">$old_uid</span><span style="color: #007700">) {<br> </span><span style="color: #FF8000">// Switch from anonymous to authorized.<br> </span><span style="color: #0000BB">drupal_session_regenerate</span><span style="color: #007700">();<br> }<br> </span><span style="color: #0000BB">$edit </span><span style="color: #007700">= array();<br> </span><span style="color: #0000BB">user_module_invoke</span><span style="color: #007700">(</span><span style="color: #DD0000">'login'</span><span style="color: #007700">, </span><span style="color: #0000BB">$edit</span><span style="color: #007700">, </span><span style="color: #0000BB">$user</span><span style="color: #007700">);<br> }<br> elseif (</span><span style="color: #0000BB">$user</span><span style="color: #007700">-></span><span style="color: #0000BB">uid</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">session_destroy</span><span style="color: #007700">();<br> }<br> </span><span style="color: #0000BB">drupal_goto</span><span style="color: #007700">();<br>}<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>However, when switching from anonymous to authenticated, the session is lost. I've tried just assigning <code>$user = drupal_anonymous_user()</code> instead of calling <code>session_destroy()</code>, which seems to work, and then I can log back in using <code>drupal_session_start()</code>, but the form_token is still lost:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">function </span><span style="color: #0000BB">devel_switch_user</span><span style="color: #007700">(</span><span style="color: #0000BB">$name </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">) {<br> global </span><span style="color: #0000BB">$user</span><span style="color: #007700">;<br><br> if (</span><span style="color: #0000BB">$user</span><span style="color: #007700">-></span><span style="color: #0000BB">uid</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">module_invoke_all</span><span style="color: #007700">(</span><span style="color: #DD0000">'user_logout'</span><span style="color: #007700">, </span><span style="color: #0000BB">$user</span><span style="color: #007700">);<br> }<br> if (isset(</span><span style="color: #0000BB">$name</span><span style="color: #007700">) && </span><span style="color: #0000BB">$account </span><span style="color: #007700">= </span><span style="color: #0000BB">user_load_by_name</span><span style="color: #007700">(</span><span style="color: #0000BB">$name</span><span style="color: #007700">)) {<br> </span><span style="color: #0000BB">$old_uid </span><span style="color: #007700">= </span><span style="color: #0000BB">$user</span><span style="color: #007700">-></span><span style="color: #0000BB">uid</span><span style="color: #007700">;<br> </span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">$account</span><span style="color: #007700">;<br> if (!</span><span style="color: #0000BB">$old_uid</span><span style="color: #007700">) {<br> </span><span style="color: #FF8000">// Switch from anonymous to authorized.<br> </span><span style="color: #0000BB">drupal_session_start</span><span style="color: #007700">();<br> </span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">$account</span><span style="color: #007700">;<br> }<br> </span><span style="color: #0000BB">$edit </span><span style="color: #007700">= array();<br> </span><span style="color: #0000BB">user_module_invoke</span><span style="color: #007700">(</span><span style="color: #DD0000">'login'</span><span style="color: #007700">, </span><span style="color: #0000BB">$edit</span><span style="color: #007700">, </span><span style="color: #0000BB">$user</span><span style="color: #007700">);<br> }<br> elseif (</span><span style="color: #0000BB">$user</span><span style="color: #007700">-></span><span style="color: #0000BB">uid</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">drupal_anonymous_user</span><span style="color: #007700">();<br> }<br> </span><span style="color: #0000BB">drupal_goto</span><span style="color: #007700">();<br>}<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>Is there a way to preserve the session (or the form_token) across switches to anon and back?</p>
>>> [!note] Pre-migration files
- [devel.switch-users-keep-session.patch](https://www.drupal.org/files/issues/devel.switch-users-keep-session.patch)
>>>
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