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# -*- coding: utf-8 -*-
Implements various helpers.
:copyright: (c) 2011 by Armin Ronacher.
:license: BSD, see LICENSE for more details.
from __future__ import with_statement
import os
import sys
import posixpath
import mimetypes
from time import time
from zlib import adler32
from threading import RLock
# try to load the best simplejson implementation available. If JSON
# is not installed, we add a failing class.
json_available = True
json = None
import simplejson as json
except ImportError:
import json
except ImportError:
# Google Appengine offers simplejson via django
from django.utils import simplejson as json
except ImportError:
json_available = False
from werkzeug.datastructures import Headers
from werkzeug.exceptions import NotFound
# this was moved in 0.7
from werkzeug.wsgi import wrap_file
except ImportError:
from werkzeug.utils import wrap_file
from jinja2 import FileSystemLoader
from .globals import session, _request_ctx_stack, current_app, request
def _assert_have_json():
"""Helper function that fails if JSON is unavailable."""
if not json_available:
raise RuntimeError('simplejson not installed')
# figure out if simplejson escapes slashes. This behaviour was changed
# from one version to another without reason.
if not json_available or '\\/' not in json.dumps('/'):
def _tojson_filter(*args, **kwargs):
if __debug__:
return json.dumps(*args, **kwargs).replace('/', '\\/')
_tojson_filter = json.dumps
# sentinel
_missing = object()
# what separators does this operating system provide that are not a slash?
# this is used by the send_from_directory function to ensure that nobody is
# able to access files from outside the filesystem.
_os_alt_seps = list(sep for sep in [os.path.sep, os.path.altsep]
if sep not in (None, '/'))
def _endpoint_from_view_func(view_func):
"""Internal helper that returns the default endpoint for a given
function. This always is the function name.
assert view_func is not None, 'expected view func if endpoint ' \
'is not provided.'
return view_func.__name__
def jsonify(*args, **kwargs):
"""Creates a :class:`~flask.Response` with the JSON representation of
the given arguments with an `application/json` mimetype. The arguments
to this function are the same as to the :class:`dict` constructor.
Example usage::
def get_current_user():
return jsonify(username=g.user.username,,
This will send a JSON response like this to the browser::
"username": "admin",
"email": "admin@localhost",
"id": 42
This requires Python 2.6 or an installed version of simplejson. For
security reasons only objects are supported toplevel. For more
information about this, have a look at :ref:`json-security`.
.. versionadded:: 0.2
if __debug__:
return current_app.response_class(json.dumps(dict(*args, **kwargs),
indent=None if request.is_xhr else 2), mimetype='application/json')
def make_response(*args):
"""Sometimes it is necessary to set additional headers in a view. Because
views do not have to return response objects but can return a value that
is converted into a response object by Flask itself, it becomes tricky to
add headers to it. This function can be called instead of using a return
and you will get a response object which you can use to attach headers.
If view looked like this and you want to add a new header::
def index():
return render_template('index.html', foo=42)
You can now do something like this::
def index():
response = make_response(render_template('index.html', foo=42))
response.headers['X-Parachutes'] = 'parachutes are cool'
return response
This function accepts the very same arguments you can return from a
view function. This for example creates a response with a 404 error
response = make_response(render_template('not_found.html'), 404)
The other use case of this function is to force the return value of a
view function into a response which is helpful with view
response = make_response(view_function())
response.headers['X-Parachutes'] = 'parachutes are cool'
Internally this function does the following things:
- if no arguments are passed, it creates a new response argument
- if one argument is passed, :meth:`flask.Flask.make_response`
is invoked with it.
- if more than one argument is passed, the arguments are passed
to the :meth:`flask.Flask.make_response` function as tuple.
.. versionadded:: 0.6
if not args:
return current_app.response_class()
if len(args) == 1:
args = args[0]
return current_app.make_response(args)
def url_for(endpoint, **values):
"""Generates a URL to the given endpoint with the method provided.
Variable arguments that are unknown to the target endpoint are appended
to the generated URL as query arguments. If the value of a query argument
is `None`, the whole pair is skipped. In case blueprints are active
you can shortcut references to the same blueprint by prefixing the
local endpoint with a dot (``.``).
This will reference the index function local to the current blueprint::
For more information, head over to the :ref:`Quickstart <url-building>`.
:param endpoint: the endpoint of the URL (name of the function)
:param values: the variable arguments of the URL rule
:param _external: if set to `True`, an absolute URL is generated.
ctx =
blueprint_name = request.blueprint
if not ctx.request._is_old_module:
if endpoint[:1] == '.':
if blueprint_name is not None:
endpoint = blueprint_name + endpoint
endpoint = endpoint[1:]
# TODO: get rid of this deprecated functionality in 1.0
if '.' not in endpoint:
if blueprint_name is not None:
endpoint = blueprint_name + '.' + endpoint
elif endpoint.startswith('.'):
endpoint = endpoint[1:]
external = values.pop('_external', False), values)
return, values, force_external=external)
def get_template_attribute(template_name, attribute):
"""Loads a macro (or variable) a template exports. This can be used to
invoke a macro from within Python code. If you for example have a
template named `_cider.html` with the following contents:
.. sourcecode:: html+jinja
{% macro hello(name) %}Hello {{ name }}!{% endmacro %}
You can access this from Python code like this::
hello = get_template_attribute('_cider.html', 'hello')
return hello('World')
.. versionadded:: 0.2
:param template_name: the name of the template
:param attribute: the name of the variable of macro to acccess
return getattr(current_app.jinja_env.get_template(template_name).module,
def flash(message, category='message'):
"""Flashes a message to the next request. In order to remove the
flashed message from the session and to display it to the user,
the template has to call :func:`get_flashed_messages`.
.. versionchanged: 0.3
`category` parameter added.
:param message: the message to be flashed.
:param category: the category for the message. The following values
are recommended: ``'message'`` for any kind of message,
``'error'`` for errors, ``'info'`` for information
messages and ``'warning'`` for warnings. However any
kind of string can be used as category.
session.setdefault('_flashes', []).append((category, message))
def get_flashed_messages(with_categories=False):
"""Pulls all flashed messages from the session and returns them.
Further calls in the same request to the function will return
the same messages. By default just the messages are returned,
but when `with_categories` is set to `True`, the return value will
be a list of tuples in the form ``(category, message)`` instead.
Example usage:
.. sourcecode:: html+jinja
{% for category, msg in get_flashed_messages(with_categories=true) %}
<p class=flash-{{ category }}>{{ msg }}
{% endfor %}
.. versionchanged:: 0.3
`with_categories` parameter added.
:param with_categories: set to `True` to also receive categories.
flashes =
if flashes is None: = flashes = session.pop('_flashes') \
if '_flashes' in session else []
if not with_categories:
return [x[1] for x in flashes]
return flashes
def send_file(filename_or_fp, mimetype=None, as_attachment=False,
attachment_filename=None, add_etags=True,
cache_timeout=60 * 60 * 12, conditional=False):
"""Sends the contents of a file to the client. This will use the
most efficient method available and configured. By default it will
try to use the WSGI server's file_wrapper support. Alternatively
you can set the application's :attr:`~Flask.use_x_sendfile` attribute
to ``True`` to directly emit an `X-Sendfile` header. This however
requires support of the underlying webserver for `X-Sendfile`.
By default it will try to guess the mimetype for you, but you can
also explicitly provide one. For extra security you probably want
to send certain files as attachment (HTML for instance). The mimetype
guessing requires a `filename` or an `attachment_filename` to be
Please never pass filenames to this function from user sources without
checking them first. Something like this is usually sufficient to
avoid security problems::
if '..' in filename or filename.startswith('/'):
.. versionadded:: 0.2
.. versionadded:: 0.5
The `add_etags`, `cache_timeout` and `conditional` parameters were
added. The default behaviour is now to attach etags.
.. versionchanged:: 0.7
mimetype guessing and etag support for file objects was
deprecated because it was unreliable. Pass a filename if you are
able to, otherwise attach an etag yourself. This functionality
will be removed in Flask 1.0
:param filename_or_fp: the filename of the file to send. This is
relative to the :attr:`~Flask.root_path` if a
relative path is specified.
Alternatively a file object might be provided
in which case `X-Sendfile` might not work and
fall back to the traditional method. Make sure
that the file pointer is positioned at the start
of data to send before calling :func:`send_file`.
:param mimetype: the mimetype of the file if provided, otherwise
auto detection happens.
:param as_attachment: set to `True` if you want to send this file with
a ``Content-Disposition: attachment`` header.
:param attachment_filename: the filename for the attachment if it
differs from the file's filename.
:param add_etags: set to `False` to disable attaching of etags.
:param conditional: set to `True` to enable conditional responses.
:param cache_timeout: the timeout in seconds for the headers.
mtime = None
if isinstance(filename_or_fp, basestring):
filename = filename_or_fp
file = None
from warnings import warn
file = filename_or_fp
filename = getattr(file, 'name', None)
# XXX: this behaviour is now deprecated because it was unreliable.
# removed in Flask 1.0
if not attachment_filename and not mimetype \
and isinstance(filename, basestring):
warn(DeprecationWarning('The filename support for file objects '
'passed to send_file is now deprecated. Pass an '
'attach_filename if you want mimetypes to be guessed.'),
if add_etags:
warn(DeprecationWarning('In future flask releases etags will no '
'longer be generated for file objects passed to the send_file '
'function because this behaviour was unreliable. Pass '
'filenames instead if possible, otherwise attach an etag '
'yourself based on another value'), stacklevel=2)
if filename is not None:
if not os.path.isabs(filename):
filename = os.path.join(current_app.root_path, filename)
if mimetype is None and (filename or attachment_filename):
mimetype = mimetypes.guess_type(filename or attachment_filename)[0]
if mimetype is None:
mimetype = 'application/octet-stream'
headers = Headers()
if as_attachment:
if attachment_filename is None:
if filename is None:
raise TypeError('filename unavailable, required for '
'sending as attachment')
attachment_filename = os.path.basename(filename)
headers.add('Content-Disposition', 'attachment',
if current_app.use_x_sendfile and filename:
if file is not None:
headers['X-Sendfile'] = filename
data = None
if file is None:
file = open(filename, 'rb')
mtime = os.path.getmtime(filename)
data = wrap_file(request.environ, file)
rv = current_app.response_class(data, mimetype=mimetype, headers=headers,
# if we know the file modification date, we can store it as the
# the time of the last modification.
if mtime is not None:
rv.last_modified = int(mtime)
rv.cache_control.public = True
if cache_timeout:
rv.cache_control.max_age = cache_timeout
rv.expires = int(time() + cache_timeout)
if add_etags and filename is not None:
rv.set_etag('flask-%s-%s-%s' % (
filename.encode('utf8') if isinstance(filename, unicode)
else filename
) & 0xffffffff
if conditional:
rv = rv.make_conditional(request)
# make sure we don't send x-sendfile for servers that
# ignore the 304 status code for x-sendfile.
if rv.status_code == 304:
rv.headers.pop('x-sendfile', None)
return rv
def safe_join(directory, filename):
"""Safely join `directory` and `filename`.
Example usage::
def wiki_page(filename):
filename = safe_join(app.config['WIKI_FOLDER'], filename)
with open(filename, 'rb') as fd:
content = # Read and process the file content...
:param directory: the base directory.
:param filename: the untrusted filename relative to that directory.
:raises: :class:`~werkzeug.exceptions.NotFound` if the resulting path
would fall out of `directory`.
filename = posixpath.normpath(filename)
for sep in _os_alt_seps:
if sep in filename:
raise NotFound()
if os.path.isabs(filename) or filename.startswith('../'):
raise NotFound()
return os.path.join(directory, filename)
def send_from_directory(directory, filename, **options):
"""Send a file from a given directory with :func:`send_file`. This
is a secure way to quickly expose static files from an upload folder
or something similar.
Example usage::
def download_file(filename):
return send_from_directory(app.config['UPLOAD_FOLDER'],
filename, as_attachment=True)
.. admonition:: Sending files and Performance
It is strongly recommended to activate either `X-Sendfile` support in
your webserver or (if no authentication happens) to tell the webserver
to serve files for the given path on its own without calling into the
web application for improved performance.
.. versionadded:: 0.5
:param directory: the directory where all the files are stored.
:param filename: the filename relative to that directory to
:param options: optional keyword arguments that are directly
forwarded to :func:`send_file`.
filename = safe_join(directory, filename)
if not os.path.isfile(filename):
raise NotFound()
return send_file(filename, conditional=True, **options)
def get_root_path(import_name):
"""Returns the path to a package or cwd if that cannot be found. This
returns the path of a package or the folder that contains a module.
Not to be confused with the package path returned by :func:`find_package`.
directory = os.path.dirname(sys.modules[import_name].__file__)
return os.path.abspath(directory)
except AttributeError:
# this is necessary in case we are running from the interactive
# python shell. It will never be used for production code however
return os.getcwd()
def find_package(import_name):
"""Finds a package and returns the prefix (or None if the package is
not installed) as well as the folder that contains the package or
module as a tuple. The package path returned is the module that would
have to be added to the pythonpath in order to make it possible to
import the module. The prefix is the path below which a UNIX like
folder structure exists (lib, share etc.).
root_mod = sys.modules[import_name.split('.')[0]]
package_path = getattr(root_mod, '__file__', None)
if package_path is None:
# support for the interactive python shell
package_path = os.getcwd()
package_path = os.path.abspath(os.path.dirname(package_path))
if hasattr(root_mod, '__path__'):
package_path = os.path.dirname(package_path)
# leave the egg wrapper folder or the actual .egg on the filesystem
test_package_path = package_path
if os.path.basename(test_package_path).endswith('.egg'):
test_package_path = os.path.dirname(test_package_path)
site_parent, site_folder = os.path.split(test_package_path)
py_prefix = os.path.abspath(sys.prefix)
if test_package_path.startswith(py_prefix):
return py_prefix, package_path
elif site_folder.lower() == 'site-packages':
parent, folder = os.path.split(site_parent)
# Windows like installations
if folder.lower() == 'lib':
base_dir = parent
# UNIX like installations
elif os.path.basename(parent).lower() == 'lib':
base_dir = os.path.dirname(parent)
base_dir = site_parent
return base_dir, package_path
return None, package_path
class locked_cached_property(object):
"""A decorator that converts a function into a lazy property. The
function wrapped is called the first time to retrieve the result
and then that calculated result is used the next time you access
the value. Works like the one in Werkzeug but has a lock for
thread safety.
def __init__(self, func, name=None, doc=None):
self.__name__ = name or func.__name__
self.__module__ = func.__module__
self.__doc__ = doc or func.__doc__
self.func = func
self.lock = RLock()
def __get__(self, obj, type=None):
if obj is None:
return self
with self.lock:
value = obj.__dict__.get(self.__name__, _missing)
if value is _missing:
value = self.func(obj)
obj.__dict__[self.__name__] = value
return value
class _PackageBoundObject(object):
def __init__(self, import_name, template_folder=None):
#: The name of the package or module. Do not change this once
#: it was set by the constructor.
self.import_name = import_name
#: location of the templates. `None` if templates should not be
#: exposed.
self.template_folder = template_folder
#: Where is the app root located?
self.root_path = get_root_path(self.import_name)
self._static_folder = None
self._static_url_path = None
def _get_static_folder(self):
if self._static_folder is not None:
return os.path.join(self.root_path, self._static_folder)
def _set_static_folder(self, value):
self._static_folder = value
static_folder = property(_get_static_folder, _set_static_folder)
del _get_static_folder, _set_static_folder
def _get_static_url_path(self):
if self._static_url_path is None:
if self.static_folder is None:
return None
return '/' + os.path.basename(self.static_folder)
return self._static_url_path
def _set_static_url_path(self, value):
self._static_url_path = value
static_url_path = property(_get_static_url_path, _set_static_url_path)
del _get_static_url_path, _set_static_url_path
def has_static_folder(self):
"""This is `True` if the package bound object's container has a
folder named ``'static'``.
.. versionadded:: 0.5
return self.static_folder is not None
def jinja_loader(self):
"""The Jinja loader for this package bound object.
.. versionadded:: 0.5
if self.template_folder is not None:
return FileSystemLoader(os.path.join(self.root_path,
def send_static_file(self, filename):
"""Function used internally to send static files from the static
folder to the browser.
.. versionadded:: 0.5
if not self.has_static_folder:
raise RuntimeError('No static folder for this object')
return send_from_directory(self.static_folder, filename)
def open_resource(self, resource, mode='rb'):
"""Opens a resource from the application's resource folder. To see
how this works, consider the following folder structure::
If you want to open the `schema.sql` file you would do the
with app.open_resource('schema.sql') as f:
contents =
:param resource: the name of the resource. To access resources within
subfolders use forward slashes as separator.
if mode not in ('r', 'rb'):
raise ValueError('Resources can only be opened for reading')
return open(os.path.join(self.root_path, resource), mode)
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