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from django.core import signing
from django.http import HttpResponseBadRequest, JsonResponse
from django.template import Origin, TemplateDoesNotExist
from django.template.engine import Engine
from django.template.loader import render_to_string
from django.utils.html import format_html, mark_safe
from debug_toolbar._compat import login_not_required
from debug_toolbar.decorators import render_with_toolbar_language, require_show_toolbar
@login_not_required
@require_show_toolbar
@render_with_toolbar_language
def template_source(request):
"""
Return the source of a template, syntax-highlighted by Pygments if
it's available.
"""
template_origin_name = request.GET.get("template_origin")
if template_origin_name is None:
return HttpResponseBadRequest('"template_origin" key is required')
try:
template_origin_name = signing.loads(template_origin_name)
except Exception:
return HttpResponseBadRequest('"template_origin" is invalid')
template_name = request.GET.get("template", template_origin_name)
final_loaders = []
loaders = list(Engine.get_default().template_loaders)
while loaders:
loader = loaders.pop(0)
if loader is not None:
# Recursively unwrap loaders until we get to loaders which do not
# themselves wrap other loaders. This adds support for
# django.template.loaders.cached.Loader and the
# django-template-partials loader (possibly among others)
if hasattr(loader, "loaders"):
loaders.extend(loader.loaders)
else:
final_loaders.append(loader)
for loader in final_loaders:
origin = Origin(template_origin_name)
try:
source = loader.get_contents(origin)
break
except TemplateDoesNotExist:
pass
else:
source = f"Template Does Not Exist: {template_origin_name}"
try:
from pygments import highlight
from pygments.formatters import HtmlFormatter
from pygments.lexers import HtmlDjangoLexer
except ModuleNotFoundError:
source = format_html("<code>{}</code>", source)
else:
source = highlight(source, HtmlDjangoLexer(), HtmlFormatter(wrapcode=True))
source = mark_safe(source)
content = render_to_string(
"debug_toolbar/panels/template_source.html",
{"source": source, "template_name": template_name},
)
return JsonResponse({"content": content})
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