Fix errors caused in jinja StrictUndefined mode

doc/changelog.rst

@@ -1,6 +1,13 @@
 Changelog
 =========
 
+2.0.0a3
+-------
+
+Fixes:
+
+* Jinja templates can now be loaded in StrictUndefined mode.
+
 2.0.0a2
 -------
 

examples/sqla/app.py

@@ -3,6 +3,7 @@
 
 from admin import app
 from admin.data import build_sample_db
+from jinja2 import StrictUndefined
 
 # Build a sample db on the fly, if one does not exist yet.
 app_dir = op.join(op.realpath(os.path.dirname(__file__)), "admin")
@@ -13,4 +14,5 @@
 
 if __name__ == "__main__":
     # Start app
+    app.jinja_env.undefined = StrictUndefined
     app.run(debug=True)

flask_admin/base.py

@@ -146,6 +146,12 @@ def index(self):
         )
     """
 
+    extra_css: list[str] = []
+    """Extra CSS files to include in the page"""
+
+    extra_js: list[str] = []
+    """Extra JavaScript files to include in the page"""
+
     @property
     def _template_args(self):
         """

flask_admin/templates/bootstrap4/admin/actions.html

@@ -14,12 +14,16 @@
 {% macro form(actions, url) %}
     {% if actions %}
         <form id="action_form" action="{{ url }}" method="POST" class="d-none">
-            {% if action_form.csrf_token %}
+            {% if action_form.csrf_token is defined and action_form.csrf_token %}
                 {{ action_form.csrf_token }}
-            {% elif csrf_token %}
+            {% elif csrf_token is defined and csrf_token %}
                 <input type="hidden" name="csrf_token" value="{{ csrf_token() }}"/>
             {% endif %}
-            {{ action_form.url(value=return_url) }}
+            {% if return_url is defined and return_url %}
+                {{ action_form.url(value=return_url) }}
+            {% else %}
+                {{ action_form.url() }}
+            {% endif %}
             {{ action_form.action() }}
         </form>
     {% endif %}

flask_admin/templates/bootstrap4/admin/file/list.html

@@ -86,7 +86,9 @@
                         {% if name != '..' and admin_view.can_delete_dirs %}
                         <form class="icon" method="POST" action="{{ get_url('.delete') }}">
                             {{ delete_form.path(value=path) }}
+                            {% if delete_form.csrf_token is defined and delete_form.csrf_token %}
                             {{ delete_form.csrf_token }}
+                            {% endif %}
                             <button onclick="return confirm('{{ _gettext('Are you sure you want to delete \\\'%(name)s\\\' recursively?', name=name) }}')">
                                 <i class="fa fa-times glyphicon glyphicon-remove"></i>
                             </button>
@@ -95,7 +97,9 @@
                     {% else %}
                     <form class="icon" method="POST" action="{{ get_url('.delete') }}">
                         {{ delete_form.path(value=path) }}
+                        {% if delete_form.csrf_token is defined and delete_form.csrf_token %}
                         {{ delete_form.csrf_token }}
+                        {% endif %}
                         <button onclick="return confirm('{{ _gettext('Are you sure you want to delete \\\'%(name)s\\\'?', name=name) }}')">
                             <i class="fa fa-trash glyphicon glyphicon-trash"></i>
                         </button>

flask_admin/templates/bootstrap4/admin/lib.html

@@ -120,7 +120,7 @@
   {% set prepend = kwargs.pop('prepend', None) %}
   {% set append = kwargs.pop('append', None) %}
   <div class="form-group {{ kwargs.get('column_class', '') }}">
-    <label for="{{ field.id }}" class="col-form-label {% if field.widget.input_type == 'checkbox' %}d-block mb-0{% endif %}">{{ field.label.text }}
+    <label for="{{ field.id }}" class="col-form-label {% if field.widget.input_type is defined and field.widget.input_type == 'checkbox' %}d-block mb-0{% endif %}">{{ field.label.text }}
         {% if h.is_required_form_field(field) %}
           <strong class="text-danger">&#42;</strong>
         {%- else -%}
@@ -135,9 +135,9 @@
       </div>
       {%- endif -%}
     {% endif %}
-      {% if field.widget.input_type == 'checkbox' %}
+      {% if field.widget.input_type is defined and field.widget.input_type == 'checkbox' %}
         {% set _class = kwargs.setdefault('class', '') %}
-      {% elif field.widget.input_type == 'file' %}
+      {% elif field.widget.input_type is defined and field.widget.input_type == 'file' %}
         {% set _class = kwargs.setdefault('class', 'form-control-file') %}
       {% else %}
         {% set _class = kwargs.setdefault('class', 'form-control') %}
@@ -179,10 +179,10 @@ <h3>{{ text }}</h3>
     {% if form.hidden_tag is defined %}
         {{ form.hidden_tag() }}
     {% else %}
-        {% if csrf_token %}
+        {% if csrf_token is defined and csrf_token %}
         <input type="hidden" name="csrf_token" value="{{ csrf_token() }}"/>
         {% endif %}
-        {% for f in form if f.widget.input_type == 'hidden' %}
+        {% for f in form if f.widget.input_type is defined and f.widget.input_type == 'hidden' %}
             {{ f }}
         {% endfor %}
     {% endif %}
@@ -192,7 +192,7 @@ <h3>{{ text }}</h3>
             {{ r(form, form_opts=form_opts) }}
         {% endfor %}
     {% else %}
-        {% for f in form if f.widget.input_type != 'hidden' %}
+        {% for f in form if f.widget.input_type is undefined or f.widget.input_type != 'hidden' %}
           {% if form_opts %}
             {% set kwargs = form_opts.widget_args.get(f.short_name, {}) %}
           {% else %}
@@ -228,7 +228,7 @@ <h3>{{ text }}</h3>
         {% if extra %}
         {{ extra }}
         {% endif %}
-        {% if cancel_url %}
+        {% if cancel_url is defined and cancel_url %}
           <a href="{{ cancel_url }}" class="btn btn-danger" role="button" {% if is_modal %}data-dismiss="modal"{% endif %}>{{ _gettext('Cancel') }}</a>
         {% endif %}
       </div>
@@ -247,39 +247,39 @@ <h3>{{ text }}</h3>
   <link href="{{ admin_static.url(filename='vendor/select2/select2.css', v='4.2.1') }}" rel="stylesheet">
   <link href="{{ admin_static.url(filename='vendor/select2/select2-bootstrap4.css', v='1.4.6') }}" rel="stylesheet">
   <link href="{{ admin_static.url(filename='vendor/bootstrap-daterangepicker/daterangepicker-bs4.css', v='1.3.22') }}" rel="stylesheet">
-  {% if config.FLASK_ADMIN_MAPS %}
+  {% if config.FLASK_ADMIN_MAPS is defined and config.FLASK_ADMIN_MAPS %}
   <link href="{{ admin_static.url(filename='vendor/leaflet/leaflet.css', v='1.0.2') }}" rel="stylesheet">
   <link href="{{ admin_static.url(filename='vendor/leaflet/leaflet.draw.css', v='0.4.6') }}" rel="stylesheet">
   {% endif %}
-  {% if editable_columns %}
+  {% if editable_columns is defined and editable_columns %}
   <link href="{{ admin_static.url(filename='vendor/x-editable/css/bootstrap4-editable.css', v='1.5.1.1') }}" rel="stylesheet">
   {% endif %}
 {% endmacro %}
 
 {% macro form_js() %}
-  {% if config.FLASK_ADMIN_MAPS %}
+  {% if config.FLASK_ADMIN_MAPS is defined and config.FLASK_ADMIN_MAPS %}
   <script {{ admin_csp_nonce_attribute }}>
   window.FLASK_ADMIN_MAPS = true;
   window.FLASK_ADMIN_MAPBOX_MAP_ID = "{{ config.FLASK_ADMIN_MAPBOX_MAP_ID }}";
-  {% if config.FLASK_ADMIN_MAPBOX_ACCESS_TOKEN %}
+  {% if config.FLASK_ADMIN_MAPBOX_ACCESS_TOKEN is defined and config.FLASK_ADMIN_MAPBOX_ACCESS_TOKEN %}
   window.FLASK_ADMIN_MAPBOX_ACCESS_TOKEN = "{{ config.FLASK_ADMIN_MAPBOX_ACCESS_TOKEN }}";
   {% endif %}
-  {% if config.FLASK_ADMIN_DEFAULT_CENTER_LAT and config.FLASK_ADMIN_DEFAULT_CENTER_LONG %}
+  {% if config.FLASK_ADMIN_DEFAULT_CENTER_LAT is defined and config.FLASK_ADMIN_DEFAULT_CENTER_LONG %}
   window.FLASK_ADMIN_DEFAULT_CENTER_LAT = "{{ config.FLASK_ADMIN_DEFAULT_CENTER_LAT }}";
   window.FLASK_ADMIN_DEFAULT_CENTER_LONG = "{{ config.FLASK_ADMIN_DEFAULT_CENTER_LONG }}";
   {% endif %}
   </script>
   <script {{ admin_csp_nonce_attribute }} src="{{ admin_static.url(filename='vendor/leaflet/leaflet.js', v='1.0.2') }}"></script>
   <script {{ admin_csp_nonce_attribute }} src="{{ admin_static.url(filename='vendor/leaflet/leaflet.draw.js', v='0.4.6') }}"></script>
-  {% if config.FLASK_ADMIN_MAPS_SEARCH %}
+  {% if config.FLASK_ADMIN_MAPS_SEARCH is defined and config.FLASK_ADMIN_MAPS_SEARCH %}
   <script {{ admin_csp_nonce_attribute }}>
   window.FLASK_ADMIN_MAPS_SEARCH = "{{ config.FLASK_ADMIN_MAPS_SEARCH }}";
   </script>
   <script {{ admin_csp_nonce_attribute }} src="https://maps.googleapis.com/maps/api/js?v=3&libraries=places&key={{ config.get('FLASK_ADMIN_GOOGLE_MAPS_API_KEY') }}"></script>
   {% endif %}
   {% endif %}
   <script {{ admin_csp_nonce_attribute }} src="{{ admin_static.url(filename='vendor/bootstrap-daterangepicker/daterangepicker.js', v='1.3.22') }}"></script>
-  {% if editable_columns %}
+  {% if editable_columns is defined and editable_columns %}
   <script {{ admin_csp_nonce_attribute }} src="{{ admin_static.url(filename='vendor/x-editable/js/bootstrap4-editable.min.js', v='1.5.1.1') }}"></script>
   {% endif %}
   <script {{ admin_csp_nonce_attribute }} src="{{ admin_static.url(filename='admin/js/form.js', v='1.0.1') }}"></script>

flask_admin/templates/bootstrap4/admin/model/list.html

@@ -135,9 +135,9 @@
                     <td class="col-{{c}}">
                     {% if admin_view.is_editable(c) %}
                         {% set form = list_forms[get_pk_value(row)] %}
-                        {% if form.csrf_token %}
+                        {% if form.csrf_token is defined and form.csrf_token %}
                         {{ form[c](pk=get_pk_value(row), display_value=get_value(row, c), csrf=form.csrf_token._value()) }}
-                        {% elif csrf_token %}
+                        {% elif csrf_token is defined and csrf_token %}
                         {{ form[c](pk=get_pk_value(row), display_value=get_value(row, c), csrf=csrf_token()) }}
                         {% else %}
                         {{ form[c](pk=get_pk_value(row), display_value=get_value(row, c)) }}

flask_admin/templates/bootstrap4/admin/model/row_actions.html

@@ -26,9 +26,9 @@
 <form class="icon" method="POST" action="{{ get_url('.delete_view') }}">
   {{ delete_form.id(value=get_pk_value(row)) }}
   {{ delete_form.url(value=return_url) }}
-  {% if delete_form.csrf_token %}
+  {% if delete_form.csrf_token is defined and delete_form.csrf_token %}
   {{ delete_form.csrf_token }}
-  {% elif csrf_token %}
+  {% elif csrf_token is defined and csrf_token %}
   <input type="hidden" name="csrf_token" value="{{ csrf_token() }}"/>
   {% endif %}
   <button onclick="return faHelpers.safeConfirm('{{ _gettext('Are you sure you want to delete this record?') }}');" title="{{ _gettext('Delete Record') }}">

flask_admin/tests/conftest.py

@@ -1,5 +1,6 @@
 import pytest
 from flask import Flask
+from jinja2 import StrictUndefined
 
 from flask_admin import Admin
 
@@ -9,7 +10,7 @@ def app():
     app = Flask(__name__)
     app.config["SECRET_KEY"] = "1"
     app.config["WTF_CSRF_ENABLED"] = False
-
+    app.jinja_env.undefined = StrictUndefined
     yield app
 
 

flask_admin/tests/test_base.py

@@ -6,6 +6,7 @@
 from flask import request
 from flask import url_for
 from flask.views import MethodView
+from jinja2 import StrictUndefined
 
 from flask_admin import base
 
@@ -18,7 +19,7 @@ def app():
     app = Flask(__name__)
     app.config["SECRET_KEY"] = "1"
     app.config["WTF_CSRF_ENABLED"] = False
-
+    app.jinja_env.undefined = StrictUndefined
     yield app