feat(numericalInput): endpoint added to validate a numerical input

Author: jesusbalderramawgu

cms/djangoapps/contentstore/api/urls.py

@@ -4,7 +4,7 @@
 from django.conf import settings
 from django.urls import re_path
 
-from cms.djangoapps.contentstore.api.views import course_import, course_quality, course_validation
+from cms.djangoapps.contentstore.api.views import course_import, course_quality, course_validation, utils
 
 
 app_name = 'contentstore'
@@ -16,5 +16,7 @@
             course_validation.CourseValidationView.as_view(), name='course_validation'),
     re_path(fr'^v1/quality/{settings.COURSE_ID_PATTERN}/$',
             course_quality.CourseQualityView.as_view(), name='course_quality'),
+    re_path(r'^v1/validate/numerical-input/$',
+            utils.NumericalInputValidationView.as_view(),name='numerical_input_validation'),
 
 ]

cms/djangoapps/contentstore/api/views/utils.py

@@ -7,14 +7,16 @@
 
 from opaque_keys.edx.keys import CourseKey
 from rest_framework import status
+from rest_framework.response import Response
 from rest_framework.generics import GenericAPIView
 
 from common.djangoapps.student.auth import has_course_author_access
 from openedx.core.djangoapps.util.forms import to_bool
 from openedx.core.lib.api.view_utils import DeveloperErrorViewMixin, view_auth_classes
 from openedx.core.lib.cache_utils import request_cached
 from xmodule.modulestore.django import modulestore  # lint-amnesty, pylint: disable=wrong-import-order
-
+from calc.preview import latex_preview
+import pyparsing
 
 @view_auth_classes()
 class BaseCourseView(DeveloperErrorViewMixin, GenericAPIView):
@@ -135,3 +137,17 @@ def _wrapper_view(self, request, course_id, *args, **kwargs):
             )
         return view(self, request, course_key, *args, **kwargs)
     return _wrapper_view
+
+class NumericalInputValidationView(GenericAPIView):
+
+    def post(self, request):
+        result = {'preview': '',
+                  'is_valid': True,
+                  'error': ''}
+        try:
+            result['preview'] = latex_preview(request.data.get('formula'))
+        except pyparsing.ParseException:
+            result["error"] = "Sorry, couldn't parse formula"
+            result['is_valid'] = False
+            return Response(result, status=400)
+        return Response(result)