web/cors.py
author Julien Cristau <julien.cristau@logilab.fr>
Wed, 05 Mar 2014 11:22:20 +0100
changeset 9575 754904ac4248
parent 9571 aaf83cc07eed
child 10002 586d0e527052
permissions -rw-r--r--
[repoapi] Avoid deprecation warnings from session.id Apparently it's called session.sessionid now.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# -*- coding: utf-8 -*-
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# copyright 2014 Logilab, PARIS
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"""A set of utility functions to handle CORS requests
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Unless specified, all references in this file are related to:
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  http://www.w3.org/TR/cors
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The provided implementation roughly follows:
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  http://www.html5rocks.com/static/images/cors_server_flowchart.png
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See also:
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  https://developer.mozilla.org/en-US/docs/HTTP/Access_control_CORS
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"""
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import urlparse
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from cubicweb.web import LOGGER
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info = LOGGER.info
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class CORSFailed(Exception):
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    """Raised when cross origin resource sharing checks failed"""
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class CORSPreflight(Exception):
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    """Raised when cross origin resource sharing checks detects the
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    request as a valid preflight request"""
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def process_request(req, config):
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    """
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    Process a request to apply CORS specification algorithms
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    Check whether the CORS specification is respected and set corresponding
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    headers to ensure response complies with the specification.
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    In case of non-compliance, no CORS-related header is set.
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    """
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    base_url = urlparse.urlsplit(req.base_url())
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    expected_host = '://'.join((base_url.scheme, base_url.netloc))
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    if not req.get_header('Origin') or req.get_header('Origin') == expected_host:
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        # not a CORS request, nothing to do
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        return
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    try:
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        # handle cross origin resource sharing (CORS)
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        if req.http_method() == 'OPTIONS':
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            if req.get_header('Access-Control-Request-Method'):
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                # preflight CORS request
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                process_preflight(req, config)
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        else: # Simple CORS or actual request
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            process_simple(req, config)
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    except CORSFailed, exc:
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        info('Cross origin resource sharing failed: %s' % exc)
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    except CORSPreflight:
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        info('Cross origin resource sharing: valid Preflight request %s')
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        raise
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def process_preflight(req, config):
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    """cross origin resource sharing (preflight)
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    Cf http://www.w3.org/TR/cors/#resource-preflight-requests
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    """
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    origin = check_origin(req, config)
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    allowed_methods = set(config['access-control-allow-methods'])
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    allowed_headers = set(config['access-control-allow-headers'])
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    try:
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        method = req.get_header('Access-Control-Request-Method')
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    except ValueError:
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        raise CORSFailed('Access-Control-Request-Method is incorrect')
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    if method not in allowed_methods:
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        raise CORSFailed('Method is not allowed')
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    try:
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        req.get_header('Access-Control-Request-Headers', ())
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    except ValueError:
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        raise CORSFailed('Access-Control-Request-Headers is incorrect')
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    req.set_header('Access-Control-Allow-Methods', allowed_methods, raw=False)
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    req.set_header('Access-Control-Allow-Headers', allowed_headers, raw=False)
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    process_common(req, config, origin)
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    raise CORSPreflight()
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def process_simple(req, config):
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    """Handle the Simple Cross-Origin Request case
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    """
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    origin = check_origin(req, config)
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    exposed_headers = config['access-control-expose-headers']
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    if exposed_headers:
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        req.set_header('Access-Control-Expose-Headers', exposed_headers, raw=False)
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    process_common(req, config, origin)
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def process_common(req, config, origin):
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    req.set_header('Access-Control-Allow-Origin', origin)
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    # in CW, we always support credential/authentication
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    req.set_header('Access-Control-Allow-Credentials', 'true')
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def check_origin(req, config):
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    origin = req.get_header('Origin').lower()
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    allowed_origins = config.get('access-control-allow-origin')
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    if not allowed_origins:
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        raise CORSFailed('access-control-allow-origin is not configured')
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    if '*' not in allowed_origins and origin not in allowed_origins:
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        raise CORSFailed('Origin is not allowed')
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    # bit of sanity check; see "6.3 Security"
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    myhost = urlparse.urlsplit(req.base_url()).netloc
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    host = req.get_header('Host')
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    if host != myhost:
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        info('cross origin resource sharing detected possible '
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             'DNS rebinding attack Host header != host of base_url: '
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             '%s != %s' % (host, myhost))
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        raise CORSFailed('Host header and hostname do not match')
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    # include "Vary: Origin" header (see 6.4)
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    req.set_header('Vary', 'Origin')
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    return origin
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