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"""
This module implements WSGI related helpers adapted from ``werkzeug.wsgi``
:copyright: (c) 2010 by the Werkzeug Team, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
from raven.utils.compat import iteritems, urllib_quote
# `get_headers` comes from `werkzeug.datastructures.EnvironHeaders`
def get_headers(environ):
"""
Returns only proper HTTP headers.
"""
for key, value in iteritems(environ):
key = str(key)
if key.startswith('HTTP_') and key not in \
('HTTP_CONTENT_TYPE', 'HTTP_CONTENT_LENGTH'):
yield key[5:].replace('_', '-').title(), value
elif key in ('CONTENT_TYPE', 'CONTENT_LENGTH'):
yield key.replace('_', '-').title(), value
def get_environ(environ):
"""
Returns our whitelisted environment variables.
"""
for key in ('REMOTE_ADDR', 'SERVER_NAME', 'SERVER_PORT'):
if key in environ:
yield key, environ[key]
# `get_host` comes from `werkzeug.wsgi`
def get_host(environ):
"""Return the real host for the given WSGI environment. This takes care
of the `X-Forwarded-Host` header.
:param environ: the WSGI environment to get the host of.
"""
scheme = environ.get('wsgi.url_scheme')
if 'HTTP_X_FORWARDED_HOST' in environ:
result = environ['HTTP_X_FORWARDED_HOST']
elif 'HTTP_HOST' in environ:
result = environ['HTTP_HOST']
else:
result = environ['SERVER_NAME']
if (scheme, str(environ['SERVER_PORT'])) not \
in (('https', '443'), ('http', '80')):
result += ':' + environ['SERVER_PORT']
if result.endswith(':80') and scheme == 'http':
result = result[:-3]
elif result.endswith(':443') and scheme == 'https':
result = result[:-4]
return result
# `get_current_url` comes from `werkzeug.wsgi`
def get_current_url(environ, root_only=False, strip_querystring=False,
host_only=False):
"""A handy helper function that recreates the full URL for the current
request or parts of it. Here an example:
>>> from werkzeug import create_environ
>>> env = create_environ("/?param=foo", "http://localhost/script")
>>> get_current_url(env)
'http://localhost/script/?param=foo'
>>> get_current_url(env, root_only=True)
'http://localhost/script/'
>>> get_current_url(env, host_only=True)
'http://localhost/'
>>> get_current_url(env, strip_querystring=True)
'http://localhost/script/'
:param environ: the WSGI environment to get the current URL from.
:param root_only: set `True` if you only want the root URL.
:param strip_querystring: set to `True` if you don't want the querystring.
:param host_only: set to `True` if the host URL should be returned.
"""
tmp = [environ['wsgi.url_scheme'], '://', get_host(environ)]
cat = tmp.append
if host_only:
return ''.join(tmp) + '/'
cat(urllib_quote(environ.get('SCRIPT_NAME', '').rstrip('/')))
if root_only:
cat('/')
else:
cat(urllib_quote('/' + environ.get('PATH_INFO', '').lstrip('/')))
if not strip_querystring:
qs = environ.get('QUERY_STRING')
if qs:
cat('?' + qs)
return ''.join(tmp)
def get_client_ip(environ):
"""
Naively yank the first IP address in an X-Forwarded-For header
and assume this is correct.
Note: Don't use this in security sensitive situations since this
value may be forged from a client.
"""
try:
return environ['HTTP_X_FORWARDED_FOR'].split(',')[0].strip()
except (KeyError, IndexError):
return environ.get('REMOTE_ADDR')