from __future__ import absolute_import from copy import copy from itertools import chain from os import fdopen import sys from tempfile import mkstemp import warnings from django.conf import settings from django.template import loader from django.utils.encoding import smart_str from .subprocess import check_output def _options_to_args(**options): """Converts ``options`` into a string of command-line arguments.""" flags = [] for name in sorted(options): value = options[name] flags.append('--' + name.replace('_', '-')) if value is not True: flags.append(unicode(value)) return flags def wkhtmltopdf(pages, output=None, **kwargs): """ Converts html to PDF using http://code.google.com/p/wkhtmltopdf/. pages: List of file paths or URLs of the html to be converted. output: Optional output file path. If None, the output is returned. **kwargs: Passed to wkhtmltopdf via _extra_args() (See https://github.com/antialize/wkhtmltopdf/blob/master/README_WKHTMLTOPDF for acceptable args.) Kwargs is passed through as arguments. e.g.: {'footer_html': 'http://example.com/foot.html'} becomes '--footer-html http://example.com/foot.html' Where there is no value passed, use True. e.g.: {'disable_javascript': True} becomes: '--disable-javascript' example usage: wkhtmltopdf(pages=['/tmp/example.html'], dpi=300, orientation='Landscape', disable_javascript=True) """ if isinstance(pages, basestring): # Support a single page. pages = [pages] if output is None: # Standard output. output = '-' # Default options: options = getattr(settings, 'WKHTMLTOPDF_CMD_OPTIONS', None) if options is None: options = {'quiet': True} else: options = copy(options) options.update(kwargs) cmd = getattr(settings, 'WKHTMLTOPDF_CMD', 'wkhtmltopdf') args = list(chain([cmd], _options_to_args(**options), list(pages), [output])) return check_output(args, stderr=sys.stderr) def template_to_temp_file(template_name, dictionary=None, context_instance=None): """ Renders a template to a temp file, and returns the path of the file. """ warnings.warn('template_to_temp_file is deprecated in favour of PDFResponse. It will be removed in version 1.', PendingDeprecationWarning, 2) file_descriptor, tempfile_path = mkstemp(suffix='.html') with fdopen(file_descriptor, 'wt') as f: f.write(smart_str(loader.render_to_string(template_name, dictionary=dictionary, context_instance=context_instance))) return tempfile_path def content_disposition_filename(filename): """ Sanitize a file name to be used in the Content-Disposition HTTP header. Even if the standard is quite permissive in terms of characters, there are a lot of edge cases that are not supported by different browsers. See http://greenbytes.de/tech/tc2231/#attmultinstances for more details. """ filename = filename.replace(';', '').replace('"', '') return http_quote(filename) def http_quote(string): """ Given a unicode string, will do its dandiest to give you back a valid ascii charset string you can use in, say, http headers and the like. """ if isinstance(string, unicode): try: import unidecode string = unidecode.unidecode(string) except ImportError: string = string.encode('ascii', 'replace') # Wrap in double-quotes for ; , and the like return '"{!s}"'.format(string.replace('\\', '\\\\').replace('"', '\\"')) try: # From Django 1.4 from django.conf import override_settings except ImportError: class override_settings(object): """ Acts as either a decorator, or a context manager. If it's a decorator it takes a function and returns a wrapped function. If it's a contextmanager it's used with the ``with`` statement. In either event entering/exiting are called before and after, respectively, the function/block is executed. """ def __init__(self, **kwargs): self.options = kwargs self.wrapped = settings._wrapped def __enter__(self): self.enable() def __exit__(self, exc_type, exc_value, traceback): self.disable() def __call__(self, test_func): from django.test import TransactionTestCase if isinstance(test_func, type) and issubclass(test_func, TransactionTestCase): original_pre_setup = test_func._pre_setup original_post_teardown = test_func._post_teardown def _pre_setup(innerself): self.enable() original_pre_setup(innerself) def _post_teardown(innerself): original_post_teardown(innerself) self.disable() test_func._pre_setup = _pre_setup test_func._post_teardown = _post_teardown return test_func else: @wraps(test_func) def inner(*args, **kwargs): with self: return test_func(*args, **kwargs) return inner def enable(self): override = copy(settings._wrapped) for key, new_value in self.options.items(): setattr(override, key, new_value) settings._wrapped = override def disable(self): settings._wrapped = self.wrapped