import string from django.conf import settings from django.core.exceptions import ImproperlyConfigured from django.template import Origin, TemplateDoesNotExist from django.utils.html import conditional_escape from .base import BaseEngine from .utils import csrf_input_lazy, csrf_token_lazy class TemplateStrings(BaseEngine): app_dirname = 'template_strings' def __init__(self, params): params = params.copy() options = params.pop('OPTIONS').copy() if options: raise ImproperlyConfigured( "Unknown options: {}".format(", ".join(options))) super().__init__(params) def from_string(self, template_code): return Template(template_code) def get_template(self, template_name): tried = [] for template_file in self.iter_template_filenames(template_name): try: with open(template_file, encoding=settings.FILE_CHARSET) as fp: template_code = fp.read() except FileNotFoundError: tried.append(( Origin(template_file, template_name, self), 'Source does not exist', )) else: return Template(template_code) raise TemplateDoesNotExist(template_name, tried=tried, backend=self) class Template(string.Template): def render(self, context=None, request=None): if context is None: context = {} else: context = {k: conditional_escape(v) for k, v in context.items()} if request is not None: context['csrf_input'] = csrf_input_lazy(request) context['csrf_token'] = csrf_token_lazy(request) return self.safe_substitute(context)