diff --git a/passerelle/utils/forms.py b/passerelle/utils/forms.py
index 8e9a6570..a5b2b4fc 100644
--- a/passerelle/utils/forms.py
+++ b/passerelle/utils/forms.py
@@ -15,8 +15,34 @@
# along with this program. If not, see .
from django import forms
-from django.core import validators
+from django.core import exceptions, validators
+from django.template import Template, TemplateSyntaxError
+from django.utils.translation import gettext_lazy as _
class LDAPURLField(forms.URLField):
default_validators = [validators.URLValidator(schemes=['ldap', 'ldaps'])]
+
+
+def validate_condition_template(condition_template):
+ real_template = f'{{% if {condition_template} %}}OK{{% endif %}}'
+ try:
+ Template(real_template)
+ except (TemplateSyntaxError, OverflowError) as e:
+ raise exceptions.ValidationError(_('syntax error: %s') % e, code='syntax-error')
+
+
+class ConditionField(forms.CharField):
+ default_validators = [validate_condition_template]
+
+
+def validate_template(template):
+ try:
+ Template(template)
+ except (TemplateSyntaxError, OverflowError) as e:
+ raise exceptions.ValidationError(_('syntax error: %s') % e, code='syntax-error')
+
+
+class TemplateField(forms.CharField):
+ default_validators = [validate_template]
+ widget = forms.Textarea
diff --git a/passerelle/utils/templates.py b/passerelle/utils/templates.py
index 1deefad9..373fe2cc 100644
--- a/passerelle/utils/templates.py
+++ b/passerelle/utils/templates.py
@@ -20,7 +20,7 @@ Disable autoescaping.
'''
from django.core.exceptions import ValidationError
-from django.template import TemplateSyntaxError
+from django.template import Context, Template, TemplateSyntaxError
from django.template.backends.django import DjangoTemplates
from django.utils.translation import gettext as _
@@ -46,3 +46,15 @@ def validate_template(template_string):
make_template(template_string)
except TemplateSyntaxError as e:
raise ValidationError(_('Invalid template: %s') % e)
+
+
+def evaluate_condition(condition_template, context_dict):
+ template = Template(f'{{% if {condition_template} %}}OK{{% endif %}}')
+ context = Context(context_dict)
+ return template.render(context) == 'OK'
+
+
+def evaluate_template(template, context_dict):
+ template = Template(template)
+ context = Context(context_dict)
+ return template.render(context)
diff --git a/tests/test_utils_forms.py b/tests/test_utils_forms.py
new file mode 100644
index 00000000..4525dbdb
--- /dev/null
+++ b/tests/test_utils_forms.py
@@ -0,0 +1,34 @@
+# passerelle - uniform access to multiple data sources and services
+# Copyright (C) 2023 Entr'ouvert
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see .
+
+import pytest
+from django.core.exceptions import ValidationError
+
+from passerelle.utils.forms import ConditionField, TemplateField
+
+
+def test_condition_field():
+ field = ConditionField()
+ with pytest.raises(ValidationError):
+ field.clean('x ==')
+ assert field.clean('x == 1') == 'x == 1'
+
+
+def test_template_field():
+ field = TemplateField()
+ with pytest.raises(ValidationError):
+ field.clean('{% if foo %}bar')
+ assert field.clean('{% if foo %}bar{% endif %}') == '{% if foo %}bar{% endif %}'
diff --git a/tests/test_utils_templates.py b/tests/test_utils_templates.py
new file mode 100644
index 00000000..1897f2d1
--- /dev/null
+++ b/tests/test_utils_templates.py
@@ -0,0 +1,26 @@
+# passerelle - uniform access to multiple data sources and services
+# Copyright (C) 2023 Entr'ouvert
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see .
+
+from passerelle.utils.templates import evaluate_condition, evaluate_template
+
+
+def test_evaluate_condition():
+ assert evaluate_condition('x == 1', {'x': 1}) is True
+ assert evaluate_condition('x == 0', {'x': 1}) is False
+
+
+def test_evaluate_template():
+ assert evaluate_template('{% if foo %}bar{% endif %}', {'foo': True}) == 'bar'