Source code for pyramid.static

# -*- coding: utf-8 -*-
import json
import os

from os.path import getmtime, normcase, normpath, join, isdir, exists

from pkg_resources import resource_exists, resource_filename, resource_isdir

from pyramid.asset import abspath_from_asset_spec, resolve_asset_spec

from pyramid.compat import lru_cache, text_

from pyramid.httpexceptions import HTTPNotFound, HTTPMovedPermanently

from pyramid.path import caller_package

from pyramid.response import _guess_type, FileResponse

from pyramid.traversal import traversal_path_info

slash = text_('/')

[docs]class static_view(object): """ An instance of this class is a callable which can act as a :app:`Pyramid` :term:`view callable`; this view will serve static files from a directory on disk based on the ``root_dir`` you provide to its constructor. The directory may contain subdirectories (recursively); the static view implementation will descend into these directories as necessary based on the components of the URL in order to resolve a path into a response. You may pass an absolute or relative filesystem path or a :term:`asset specification` representing the directory containing static files as the ``root_dir`` argument to this class' constructor. If the ``root_dir`` path is relative, and the ``package_name`` argument is ``None``, ``root_dir`` will be considered relative to the directory in which the Python file which *calls* ``static`` resides. If the ``package_name`` name argument is provided, and a relative ``root_dir`` is provided, the ``root_dir`` will be considered relative to the Python :term:`package` specified by ``package_name`` (a dotted path to a Python package). ``cache_max_age`` influences the ``Expires`` and ``Max-Age`` response headers returned by the view (default is 3600 seconds or one hour). ``use_subpath`` influences whether ``request.subpath`` will be used as ``PATH_INFO`` when calling the underlying WSGI application which actually serves the static files. If it is ``True``, the static application will consider ``request.subpath`` as ``PATH_INFO`` input. If it is ``False``, the static application will consider request.environ[``PATH_INFO``] as ``PATH_INFO`` input. By default, this is ``False``. .. note:: If the ``root_dir`` is relative to a :term:`package`, or is a :term:`asset specification` the :app:`Pyramid` :class:`pyramid.config.Configurator` method can be used to override assets within the named ``root_dir`` package-relative directory. However, if the ``root_dir`` is absolute, configuration will not be able to override the assets it contains. """ def __init__( self, root_dir, cache_max_age=3600, package_name=None, use_subpath=False, index='index.html', ): # package_name is for bw compat; it is preferred to pass in a # package-relative path as root_dir # (e.g. ``anotherpackage:foo/static``). self.cache_max_age = cache_max_age if package_name is None: package_name = caller_package().__name__ package_name, docroot = resolve_asset_spec(root_dir, package_name) self.use_subpath = use_subpath self.package_name = package_name self.docroot = docroot self.norm_docroot = normcase(normpath(docroot)) self.index = index def __call__(self, context, request): if self.use_subpath: path_tuple = request.subpath else: path_tuple = traversal_path_info(request.environ['PATH_INFO']) path = _secure_path(path_tuple) if path is None: raise HTTPNotFound('Out of bounds: %s' % request.url) if self.package_name: # package resource resource_path = '%s/%s' % (self.docroot.rstrip('/'), path) if resource_isdir(self.package_name, resource_path): if not request.path_url.endswith('/'): self.add_slash_redirect(request) resource_path = '%s/%s' % ( resource_path.rstrip('/'), self.index, ) if not resource_exists(self.package_name, resource_path): raise HTTPNotFound(request.url) filepath = resource_filename(self.package_name, resource_path) else: # filesystem file # os.path.normpath converts / to \ on windows filepath = normcase(normpath(join(self.norm_docroot, path))) if isdir(filepath): if not request.path_url.endswith('/'): self.add_slash_redirect(request) filepath = join(filepath, self.index) if not exists(filepath): raise HTTPNotFound(request.url) content_type, content_encoding = _guess_type(filepath) return FileResponse( filepath, request, self.cache_max_age, content_type, content_encoding=None, ) def add_slash_redirect(self, request): url = request.path_url + '/' qs = request.query_string if qs: url = url + '?' + qs raise HTTPMovedPermanently(url)
_seps = set(['/', os.sep]) def _contains_slash(item): for sep in _seps: if sep in item: return True _has_insecure_pathelement = set(['..', '.', '']).intersection @lru_cache(1000) def _secure_path(path_tuple): if _has_insecure_pathelement(path_tuple): # belt-and-suspenders security; this should never be true # unless someone screws up the traversal_path code # (request.subpath is computed via traversal_path too) return None if any([_contains_slash(item) for item in path_tuple]): return None encoded = slash.join(path_tuple) # will be unicode return encoded
[docs]class QueryStringCacheBuster(object): """ An implementation of :class:`~pyramid.interfaces.ICacheBuster` which adds a token for cache busting in the query string of an asset URL. The optional ``param`` argument determines the name of the parameter added to the query string and defaults to ``'x'``. To use this class, subclass it and provide a ``tokenize`` method which accepts ``request, pathspec, kw`` and returns a token. .. versionadded:: 1.6 """ def __init__(self, param='x'): self.param = param def __call__(self, request, subpath, kw): token = self.tokenize(request, subpath, kw) query = kw.setdefault('_query', {}) if isinstance(query, dict): query[self.param] = token else: kw['_query'] = tuple(query) + ((self.param, token),) return subpath, kw
[docs]class QueryStringConstantCacheBuster(QueryStringCacheBuster): """ An implementation of :class:`~pyramid.interfaces.ICacheBuster` which adds an arbitrary token for cache busting in the query string of an asset URL. The ``token`` parameter is the token string to use for cache busting and will be the same for every request. The optional ``param`` argument determines the name of the parameter added to the query string and defaults to ``'x'``. .. versionadded:: 1.6 """ def __init__(self, token, param='x'): super(QueryStringConstantCacheBuster, self).__init__(param=param) self._token = token def tokenize(self, request, subpath, kw): return self._token
[docs]class ManifestCacheBuster(object): """ An implementation of :class:`~pyramid.interfaces.ICacheBuster` which uses a supplied manifest file to map an asset path to a cache-busted version of the path. The ``manifest_spec`` can be an absolute path or a :term:`asset specification` pointing to a package-relative file. The manifest file is expected to conform to the following simple JSON format: .. code-block:: json { "css/main.css": "css/main-678b7c80.css", "images/background.png": "images/background-a8169106.png", } By default, it is a JSON-serialized dictionary where the keys are the source asset paths used in calls to :meth:`~pyramid.request.Request.static_url`. For example: .. code-block:: pycon >>> request.static_url('myapp:static/css/main.css') "" The file format and location can be changed by subclassing and overriding :meth:`.parse_manifest`. If a path is not found in the manifest it will pass through unchanged. If ``reload`` is ``True`` then the manifest file will be reloaded when changed. It is not recommended to leave this enabled in production. If the manifest file cannot be found on disk it will be treated as an empty mapping unless ``reload`` is ``False``. .. versionadded:: 1.6 """ exists = staticmethod(exists) # testing getmtime = staticmethod(getmtime) # testing def __init__(self, manifest_spec, reload=False): package_name = caller_package().__name__ self.manifest_path = abspath_from_asset_spec( manifest_spec, package_name ) self.reload = reload self._mtime = None if not reload: self._manifest = self.get_manifest() def get_manifest(self): with open(self.manifest_path, 'rb') as fp: return self.parse_manifest(
[docs] def parse_manifest(self, content): """ Parse the ``content`` read from the ``manifest_path`` into a dictionary mapping. Subclasses may override this method to use something other than ``json.loads`` to load any type of file format and return a conforming dictionary. """ return json.loads(content.decode('utf-8'))
@property def manifest(self): """ The current manifest dictionary.""" if self.reload: if not self.exists(self.manifest_path): return {} mtime = self.getmtime(self.manifest_path) if self._mtime is None or mtime > self._mtime: self._manifest = self.get_manifest() self._mtime = mtime return self._manifest def __call__(self, request, subpath, kw): subpath = self.manifest.get(subpath, subpath) return (subpath, kw)