feat(usermanager): add User delete view

lumi2/templates/usermanager/user_delete.html

@@ -0,0 +1,35 @@
+{% extends 'base.html' %}
+
+{% block content %}
+<div class="row justify-content-sm-center">
+    <div class="col-sm text-center align-self-center m-2">
+        <p><b>Are you sure</b> you want to <b class="text-danger">delete</b> the user '{{ username }}'?</p>
+    </div>
+</div>
+{% if deleted_groups %}
+<div class="row justify-content-sm-center border border-warning rounded m-2">
+    <div class="col-sm text-center align-self-center m-2">
+        <p><u class="text-warning">Warning:</u> Since {{ username }} is their only member, the following <b>groups</b> will be deleted as well:</p>
+    </div>
+    <div class="col-sm text-center align-self-center m-2">
+        <ul class="list-group">
+            {% for groupname in deleted_groups %}
+            <li class="list-group-item">{{ groupname }}</li>
+            {% endfor %}
+        </ul>
+    </div>
+</div>
+{% endif %}
+<div class="row justify-content-sm-center">
+    <div class="col-sm text-center align-self-center m-2">
+        <a class="btn btn-secondary"
+           href="{{ url_for('usermanager.user_view', username=username) }}"
+           role="button">No, take me back</a>
+    </div>
+    <div class="col-sm text-center align-self-center m-2">
+        <form method="post">
+            <input class="btn btn-danger" type="submit" value="Yes, delete this user">
+        </form>
+    </div>
+</div>
+{% endblock content %}

lumi2/templates/usermanager/user_list.html

@@ -13,6 +13,7 @@
         Create a new user
     </a>
 </div>
+{% if users %}
 <div class="table-responsive">
     <table class="table table-striped table-hover">
         <thead>
@@ -47,4 +48,9 @@
         </tbody>
     </table>
 </div>
+{% else %}
+<div class="text-center">
+    <p class="text-muted">There are currently no users.</p>
+</div>
+{% endif %}
 {% endblock content %}

lumi2/templates/usermanager/user_view.html

@@ -2,26 +2,26 @@
 
 {% block content %}
 <div class="row justify-content-sm-center">
-    <div class="col-sm-4 text-center align-self-center m-2">
+    <div class="col-sm-2 text-center align-self-center m-2">
         <img src="{{ url_for('static', filename='images/users/' + user.username + '/full.jpg') }}"
              alt="profile picture for user {{ user.username }}"
              class="img-thumbnail"
              style="max-width: 150px"
         >
     </div>
-    <div class="col-sm-auto vstack gap-1 align-self-center m-2">
+    <div class="col-sm-4 vstack gap-1 align-self-center m-2">
         <div><b>Username:</b> {{ user.username }}</div>
         <div><b>Email:</b> {{ user.email }}</div>
         <div><b>First Name:</b> {{ user.first_name }}</div>
         <div><b>Last Name:</b> {{ user.last_name }}</div>
         <div><b>Nickname:</b> {{ user.display_name }}</div>
     </div>
-    <div class="col-sm-4 vstack gap-1 align-self-center m-2">
+    <div class="col-sm-auto vstack gap-1 align-self-center m-2">
         <a class="btn btn-primary"
             href="{{ url_for('usermanager.user_update', username=user.username) }}"
             role="button">Edit</a>
         <a class="btn btn-danger"
-            href="#"
+            href="{{ url_for('usermanager.user_delete', username=user.username) }}"
             role="button">Delete</a>
     </div>
 </div>

lumi2/usermanager.py

@@ -259,3 +259,44 @@ def user_update(username: str):
         heading=f"Edit user: {user.username}",
         is_update=True,
     )
+
+
+@bp.route("/users/delete/<string:username>", methods=("GET", "POST"))
+def user_delete(username: str):
+    """Deletion view for a specific User.
+
+    Provides a form prompting the confirmation of the specified user.
+    If the user is the sole member of any groups, the groups which get deleted
+    implicitly by the lumi.ldap.delete_user() operation will be listed here as
+    well.
+    """
+
+    try:
+        conn = ldap.get_connection()
+    except Exception:
+        abort(500)
+
+    try:
+        user = ldap.get_user(conn, username)
+    except ldap.EntryNotFoundException:
+        conn.unbind()
+        abort(404)
+
+    deleted_groups = set()
+    for group in ldap.get_groups_of_user(conn, user):
+        if len(group.members) == 1:
+            deleted_groups.add(group.groupname)
+
+    if request.method == 'POST':
+        ldap.delete_user(conn, user.username)
+        conn.unbind()
+        flash(f"The user '{user.username}' was deleted.")
+        for groupname in deleted_groups:
+            flash(f"The group '{groupname}' was deleted.")
+        return redirect(url_for('usermanager.user_list'))
+
+    return render_template(
+        'usermanager/user_delete.html',
+        username=user.username,
+        deleted_groups=deleted_groups,
+    )