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"""
Wrapper for loading templates from the filesystem.
"""
from django.conf import settings
from django.template.base import TemplateDoesNotExist
from django.template.loader import BaseLoader
from django.utils._os import safe_join
class Loader(BaseLoader):
is_usable = True
def get_template_sources(self, template_name, template_dirs=None):
"""
Returns the absolute paths to "template_name", when appended to each
directory in "template_dirs". Any paths that don't lie inside one of the
template dirs are excluded from the result set, for security reasons.
"""
if not template_dirs:
template_dirs = settings.TEMPLATE_DIRS
for template_dir in template_dirs:
try:
yield safe_join(template_dir, template_name)
except UnicodeDecodeError:
# The template dir name was a bytestring that wasn't valid UTF-8.
raise
except ValueError:
# The joined path was located outside of this particular
# template_dir (it might be inside another one, so this isn't
# fatal).
pass
def load_template_source(self, template_name, template_dirs=None):
tried = []
for filepath in self.get_template_sources(template_name, template_dirs):
try:
with open(filepath, 'rb') as fp:
return (fp.read().decode(settings.FILE_CHARSET), filepath)
except IOError:
tried.append(filepath)
if tried:
error_msg = "Tried %s" % tried
else:
error_msg = "Your TEMPLATE_DIRS setting is empty. Change it to point to at least one template directory."
raise TemplateDoesNotExist(error_msg)
load_template_source.is_usable = True
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