core: add separate autosubmit form for use without flows

passbook/core/templates/generic/autosubmit_form_full.html

@@ -0,0 +1,34 @@
+{% extends "login/base_full.html" %}
+
+{% load passbook_utils %}
+{% load i18n %}
+
+{% block title %}
+{{ title }}
+{% endblock %}
+
+{% block card %}
+<form method="POST" action="{{ url }}" autosubmit>
+    {% csrf_token %}
+    {% for key, value in attrs.items %}
+    <input type="hidden" name="{{ key }}" value="{{ value }}">
+    {% endfor %}
+    <div class="pf-c-form__group pf-u-display-flex pf-u-justify-content-center">
+        <div class="pf-c-form__group-control">
+            <span class="pf-c-spinner" role="progressbar" aria-valuetext="Loading...">
+                <span class="pf-c-spinner__clipper"></span>
+                <span class="pf-c-spinner__lead-ball"></span>
+                <span class="pf-c-spinner__tail-ball"></span>
+            </span>
+        </div>
+    </div>
+    <div class="pf-c-form__group pf-m-action">
+        <div class="pf-c-form__actions">
+            <button class="pf-c-button pf-m-primary pf-m-block" type="submit">{% trans 'Continue' %}</button>
+        </div>
+    </div>
+</form>
+<script>
+document.querySelector("form").submit();
+</script>
+{% endblock %}

passbook/sources/saml/views.py

@@ -53,7 +53,7 @@ class InitiateView(View):
         if source.binding_type == SAMLBindingTypes.POST_AUTO:
             return render(
                 request,
-                "generic/autosubmit_form.html",
+                "generic/autosubmit_form_full.html",
                 {
                     "title": _("Redirecting to %(app)s..." % {"app": source.name}),
                     "attrs": {"SAMLRequest": saml_request, "RelayState": relay_state},