root / snf-django-lib / snf_django / lib / api / proxy / __init__.py @ 39974c71
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# Copyright 2012, 2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from django.http import HttpResponse |
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from objpool.http import PooledHTTPConnection |
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from synnefo.lib import join_urls |
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from .utils import fix_header, forward_header |
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import urllib |
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import urlparse |
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# We use proxy to delegate requests to another domain. Sending host specific
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# headers (Host, Cookie) may cause confusion to the server we proxy to.
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#
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# http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.10
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# Connection and MUST NOT be communicated by proxies over further connections
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EXCLUDE_HEADERS = ['Host', 'Cookie', 'Connection', 'X-Forwarded-Host'] |
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def proxy(request, proxy_base=None, target_base=None): |
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kwargs = {} |
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if None in (proxy_base, target_base): |
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m = "proxy() needs both proxy_base and target_base argument not None"
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raise AssertionError(m) |
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parsed = urlparse.urlparse(target_base) |
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target_base = '/' + parsed.path.strip('/') |
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proxy_base = proxy_base.strip('/')
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# prepare headers
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headers = dict(map(lambda (k, v): fix_header(k, v), |
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filter(lambda (k, v): forward_header(k), |
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request.META.iteritems()))) |
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# set X-Forwarded-For, if already set, pass it through, otherwise set it
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# to the current request remote address
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source_ip = request.META.get('REMOTE_ADDR', None) |
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if source_ip and not 'X-Forwarded-For' in headers: |
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headers['X-Forwarded-For'] = source_ip
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# request.META remains cleanup
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for k in headers.keys(): |
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if '_' in k: |
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headers.pop(k) |
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for k in EXCLUDE_HEADERS: |
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headers.pop(k, None)
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kwargs['headers'] = headers
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kwargs['body'] = request.raw_post_data
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path = request.path.lstrip('/')
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if not path.startswith(proxy_base): |
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m = "request path '{0}' does not start with proxy_base '{1}'"
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m = m.format(path, proxy_base) |
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raise AssertionError(m) |
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path = path.replace(proxy_base, '', 1) |
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path = join_urls(target_base, path) |
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with PooledHTTPConnection(parsed.netloc, parsed.scheme) as conn: |
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conn.request( |
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request.method, |
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'?'.join([path, urllib.urlencode(request.GET)]), **kwargs)
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response = conn.getresponse() |
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# turn httplib.HttpResponse to django.http.Response
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length = response.getheader('content-length', None) |
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data = response.read(length) |
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status = int(response.status)
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django_http_response = HttpResponse(data, status=status) |
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# do we need to exclude any headers here?
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for name, value in response.getheaders(): |
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django_http_response[name] = value |
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return django_http_response
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