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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, HttpResponseRedirect
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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, redirect=False):
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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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    # Get strings from lazy objects
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    proxy_base = str(proxy_base)
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    target_base = str(target_base)
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    parsed = urlparse.urlparse(target_base)
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    target_path = '/' + 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.body
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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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    # redirect to target instead of proxing
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    if redirect:
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        redirect_url = join_urls(target_base, path)
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        qs = urllib.urlencode(request.GET)
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        return HttpResponseRedirect('?'.join([redirect_url, qs]))
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    path = join_urls(target_path, 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