import cgi import mimetypes import os import posixpath import re import shutil import stat import sys import tempfile from os import path from urllib.request import urlretrieve import django from django.conf import settings from django.core.management.base import BaseCommand, CommandError from django.core.management.utils import handle_extensions from django.template import Context, Engine from django.utils import archive from django.utils.version import get_docs_version _drive_re = re.compile('^([a-z]):', re.I) _url_drive_re = re.compile('^([a-z])[:|]', re.I) class TemplateCommand(BaseCommand): """ Copies either a Django application layout template or a Django project layout template into the specified directory. :param style: A color style object (see django.core.management.color). :param app_or_project: The string 'app' or 'project'. :param name: The name of the application or project. :param directory: The directory to which the template should be copied. :param options: The additional variables passed to project or app templates """ requires_system_checks = False # The supported URL schemes url_schemes = ['http', 'https', 'ftp'] # Can't perform any active locale changes during this command, because # setting might not be available at all. leave_locale_alone = True # Rewrite the following suffixes when determining the target filename. rewrite_template_suffixes = ( # Allow shipping invalid .py files without byte-compilation. ('.py-tpl', '.py'), ) def add_arguments(self, parser): parser.add_argument('name', help='Name of the application or project.') parser.add_argument('directory', nargs='?', help='Optional destination directory') parser.add_argument('--template', help='The path or URL to load the template from.') parser.add_argument( '--extension', '-e', dest='extensions', action='append', default=['py'], help='The file extension(s) to render (default: "py"). ' 'Separate multiple extensions with commas, or use ' '-e multiple times.' ) parser.add_argument( '--name', '-n', dest='files', action='append', default=[], help='The file name(s) to render. Separate multiple extensions ' 'with commas, or use -n multiple times.' ) def handle(self, app_or_project, name, target=None, **options): self.app_or_project = app_or_project self.paths_to_remove = [] self.verbosity = options['verbosity'] self.validate_name(name, app_or_project) # if some directory is given, make sure it's nicely expanded if target is None: top_dir = path.join(os.getcwd(), name) try: os.makedirs(top_dir) except FileExistsError: raise CommandError("'%s' already exists" % top_dir) except OSError as e: raise CommandError(e) else: top_dir = os.path.abspath(path.expanduser(target)) if not os.path.exists(top_dir): raise CommandError("Destination directory '%s' does not " "exist, please create it first." % top_dir) extensions = tuple(handle_extensions(options['extensions'])) extra_files = [] for file in options['files']: extra_files.extend(map(lambda x: x.strip(), file.split(','))) if self.verbosity >= 2: self.stdout.write("Rendering %s template files with " "extensions: %s\n" % (app_or_project, ', '.join(extensions))) self.stdout.write("Rendering %s template files with " "filenames: %s\n" % (app_or_project, ', '.join(extra_files))) base_name = '%s_name' % app_or_project base_subdir = '%s_template' % app_or_project base_directory = '%s_directory' % app_or_project camel_case_name = 'camel_case_%s_name' % app_or_project camel_case_value = ''.join(x for x in name.title() if x != '_') context = Context(dict(options, **{ base_name: name, base_directory: top_dir, camel_case_name: camel_case_value, 'docs_version': get_docs_version(), 'django_version': django.__version__, }), autoescape=False) # Setup a stub settings environment for template rendering if not settings.configured: settings.configure() django.setup() template_dir = self.handle_template(options['template'], base_subdir) prefix_length = len(template_dir) + 1 for root, dirs, files in os.walk(template_dir): path_rest = root[prefix_length:] relative_dir = path_rest.replace(base_name, name) if relative_dir: target_dir = path.join(top_dir, relative_dir) if not path.exists(target_dir): os.mkdir(target_dir) for dirname in dirs[:]: if dirname.startswith('.') or dirname == '__pycache__': dirs.remove(dirname) for filename in files: if filename.endswith(('.pyo', '.pyc', '.py.class')): # Ignore some files as they cause various breakages. continue old_path = path.join(root, filename) new_path = path.join(top_dir, relative_dir, filename.replace(base_name, name)) for old_suffix, new_suffix in self.rewrite_template_suffixes: if new_path.endswith(old_suffix): new_path = new_path[:-len(old_suffix)] + new_suffix break # Only rewrite once if path.exists(new_path): raise CommandError("%s already exists, overlaying a " "project or app into an existing " "directory won't replace conflicting " "files" % new_path) # Only render the Python files, as we don't want to # accidentally render Django templates files if new_path.endswith(extensions) or filename in extra_files: with open(old_path, 'r', encoding='utf-8') as template_file: content = template_file.read() template = Engine().from_string(content) content = template.render(context) with open(new_path, 'w', encoding='utf-8') as new_file: new_file.write(content) else: shutil.copyfile(old_path, new_path) if self.verbosity >= 2: self.stdout.write("Creating %s\n" % new_path) try: shutil.copymode(old_path, new_path) self.make_writeable(new_path) except OSError: self.stderr.write( "Notice: Couldn't set permission bits on %s. You're " "probably using an uncommon filesystem setup. No " "problem." % new_path, self.style.NOTICE) if self.paths_to_remove: if self.verbosity >= 2: self.stdout.write("Cleaning up temporary files.\n") for path_to_remove in self.paths_to_remove: if path.isfile(path_to_remove): os.remove(path_to_remove) else: shutil.rmtree(path_to_remove) def handle_template(self, template, subdir): """ Determines where the app or project templates are. Use django.__path__[0] as the default because we don't know into which directory Django has been installed. """ if template is None: return path.join(django.__path__[0], 'conf', subdir) else: if template.startswith('file://'): template = template[7:] expanded_template = path.expanduser(template) expanded_template = path.normpath(expanded_template) if path.isdir(expanded_template): return expanded_template if self.is_url(template): # downloads the file and returns the path absolute_path = self.download(template) else: absolute_path = path.abspath(expanded_template) if path.exists(absolute_path): return self.extract(absolute_path) raise CommandError("couldn't handle %s template %s." % (self.app_or_project, template)) def validate_name(self, name, app_or_project): if name is None: raise CommandError("you must provide %s %s name" % ( "an" if app_or_project == "app" else "a", app_or_project)) # If it's not a valid directory name. if not name.isidentifier(): raise CommandError( "%r is not a valid %s name. Please make sure the name is " "a valid identifier." % (name, app_or_project) ) def download(self, url): """ Downloads the given URL and returns the file name. """ def cleanup_url(url): tmp = url.rstrip('/') filename = tmp.split('/')[-1] if url.endswith('/'): display_url = tmp + '/' else: display_url = url return filename, display_url prefix = 'django_%s_template_' % self.app_or_project tempdir = tempfile.mkdtemp(prefix=prefix, suffix='_download') self.paths_to_remove.append(tempdir) filename, display_url = cleanup_url(url) if self.verbosity >= 2: self.stdout.write("Downloading %s\n" % display_url) try: the_path, info = urlretrieve(url, path.join(tempdir, filename)) except IOError as e: raise CommandError("couldn't download URL %s to %s: %s" % (url, filename, e)) used_name = the_path.split('/')[-1] # Trying to get better name from response headers content_disposition = info.get('content-disposition') if content_disposition: _, params = cgi.parse_header(content_disposition) guessed_filename = params.get('filename') or used_name else: guessed_filename = used_name # Falling back to content type guessing ext = self.splitext(guessed_filename)[1] content_type = info.get('content-type') if not ext and content_type: ext = mimetypes.guess_extension(content_type) if ext: guessed_filename += ext # Move the temporary file to a filename that has better # chances of being recognized by the archive utils if used_name != guessed_filename: guessed_path = path.join(tempdir, guessed_filename) shutil.move(the_path, guessed_path) return guessed_path # Giving up return the_path def splitext(self, the_path): """ Like os.path.splitext, but takes off .tar, too """ base, ext = posixpath.splitext(the_path) if base.lower().endswith('.tar'): ext = base[-4:] + ext base = base[:-4] return base, ext def extract(self, filename): """ Extracts the given file to a temporarily and returns the path of the directory with the extracted content. """ prefix = 'django_%s_template_' % self.app_or_project tempdir = tempfile.mkdtemp(prefix=prefix, suffix='_extract') self.paths_to_remove.append(tempdir) if self.verbosity >= 2: self.stdout.write("Extracting %s\n" % filename) try: archive.extract(filename, tempdir) return tempdir except (archive.ArchiveException, IOError) as e: raise CommandError("couldn't extract file %s to %s: %s" % (filename, tempdir, e)) def is_url(self, template): """ Returns True if the name looks like a URL """ if ':' not in template: return False scheme = template.split(':', 1)[0].lower() return scheme in self.url_schemes def make_writeable(self, filename): """ Make sure that the file is writeable. Useful if our source is read-only. """ if sys.platform.startswith('java'): # On Jython there is no os.access() return if not os.access(filename, os.W_OK): st = os.stat(filename) new_permissions = stat.S_IMODE(st.st_mode) | stat.S_IWUSR os.chmod(filename, new_permissions)