Closes #11294: Markdown Preview (#11894)

* MarkdownWidget

* Change border and color of active markdown tab

* Fix template name typo

* Add render markdown endpoint

* Static assets for markdown widget

* widget style fix and unique ids based on name

* Replace SmallTextArea with SmallMarkdownWidget

* Clear innerHTML before swapping

* render markdown directly in template

* change render markdown view path

* remove small markdown widget

* Simplify rendering logic

* Use a form to clean input Markdown data

---------

Co-authored-by: Jeremy Stretch <jstretch@ns1.com>

netbox/extras/forms/__init__.py

@@ -2,6 +2,7 @@ from .model_forms import *
 from .filtersets import *
 from .bulk_edit import *
 from .bulk_import import *
+from .misc import *
 from .mixins import *
 from .config import *
 from .scripts import *

netbox/extras/forms/misc.py

@@ -0,0 +1,14 @@
+from django import forms
+
+__all__ = (
+    'RenderMarkdownForm',
+)
+
+
+class RenderMarkdownForm(forms.Form):
+    """
+    Provides basic validation for markup to be rendered.
+    """
+    text = forms.CharField(
+        required=False
+    )

netbox/extras/urls.py

@@ -92,4 +92,6 @@ urlpatterns = [
     path('scripts/results/<int:job_result_pk>/', views.ScriptResultView.as_view(), name='script_result'),
     re_path(r'^scripts/(?P<module>.([^.]+)).(?P<name>.(.+))/', views.ScriptView.as_view(), name='script'),
 
+    # Markdown
+    path('render/markdown/', views.RenderMarkdownView.as_view(), name="render_markdown")
 ]

netbox/extras/views.py

@@ -1,7 +1,7 @@
 from django.contrib import messages
 from django.contrib.contenttypes.models import ContentType
 from django.db.models import Count, Q
-from django.http import Http404, HttpResponseForbidden
+from django.http import Http404, HttpResponseBadRequest, HttpResponseForbidden, HttpResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.urls import reverse
 from django.views.generic import View
@@ -10,6 +10,7 @@ from rq import Worker
 
 from netbox.views import generic
 from utilities.htmx import is_htmx
+from utilities.templatetags.builtins.filters import render_markdown
 from utilities.utils import copy_safe_request, count_related, get_viewname, normalize_querydict, shallow_compare_dict
 from utilities.views import ContentTypePermissionRequiredMixin, register_model_view
 from . import filtersets, forms, tables
@@ -885,3 +886,18 @@ class JobResultBulkDeleteView(generic.BulkDeleteView):
     queryset = JobResult.objects.all()
     filterset = filtersets.JobResultFilterSet
     table = tables.JobResultTable
+
+
+#
+# Markdown
+#
+
+class RenderMarkdownView(View):
+
+    def post(self, request):
+        form = forms.RenderMarkdownForm(request.POST)
+        if not form.is_valid():
+            HttpResponseBadRequest()
+        rendered = render_markdown(form.cleaned_data['text'])
+
+        return HttpResponse(rendered)