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from __future__ import absolute_import, unicode_literals
from django.core import signing
from django.http import HttpResponseBadRequest
from django.template import TemplateDoesNotExist
from django.template.engine import Engine
from django.template.response import SimpleTemplateResponse
from django.utils.safestring import mark_safe
from debug_toolbar.decorators import require_show_toolbar
try:
from django.template import Origin
except ImportError:
Origin = None
@require_show_toolbar
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', None)
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 = Engine.get_default().template_loaders
for loader in loaders:
if loader is not None:
# When the loader has loaders associated with it,
# append those loaders to the list. This occurs with
# django.template.loaders.cached.Loader
if hasattr(loader, 'loaders'):
final_loaders += loader.loaders
else:
final_loaders.append(loader)
for loader in final_loaders:
if Origin: # django>=1.9
origin = Origin(template_origin_name)
try:
source = loader.get_contents(origin)
break
except TemplateDoesNotExist:
pass
else: # django<1.9
try:
source, _ = loader.load_template_source(template_name)
break
except TemplateDoesNotExist:
pass
else:
source = "Template Does Not Exist: %s" % (template_origin_name,)
try:
from pygments import highlight
from pygments.lexers import HtmlDjangoLexer
from pygments.formatters import HtmlFormatter
source = highlight(source, HtmlDjangoLexer(), HtmlFormatter())
source = mark_safe(source)
source.pygmentized = True
except ImportError:
pass
# Using SimpleTemplateResponse avoids running global context processors.
return SimpleTemplateResponse('debug_toolbar/panels/template_source.html', {
'source': source,
'template_name': template_name
})
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