root / snf-django-lib / snf_django / lib / api / proxy / __init__.py @ cfc4b87c
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1 | 33c84784 | Sofia Papagiannaki | # Copyright 2012, 2013 GRNET S.A. All rights reserved.
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2 | 33c84784 | Sofia Papagiannaki | #
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3 | 33c84784 | Sofia Papagiannaki | # Redistribution and use in source and binary forms, with or
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4 | 33c84784 | Sofia Papagiannaki | # without modification, are permitted provided that the following
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5 | 33c84784 | Sofia Papagiannaki | # conditions are met:
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6 | 33c84784 | Sofia Papagiannaki | #
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7 | 33c84784 | Sofia Papagiannaki | # 1. Redistributions of source code must retain the above
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8 | 33c84784 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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9 | 33c84784 | Sofia Papagiannaki | # disclaimer.
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10 | 33c84784 | Sofia Papagiannaki | #
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11 | 33c84784 | Sofia Papagiannaki | # 2. Redistributions in binary form must reproduce the above
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12 | 33c84784 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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13 | 33c84784 | Sofia Papagiannaki | # disclaimer in the documentation and/or other materials
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14 | 33c84784 | Sofia Papagiannaki | # provided with the distribution.
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15 | 33c84784 | Sofia Papagiannaki | #
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16 | 33c84784 | Sofia Papagiannaki | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | 33c84784 | Sofia Papagiannaki | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | 33c84784 | Sofia Papagiannaki | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | 33c84784 | Sofia Papagiannaki | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | 33c84784 | Sofia Papagiannaki | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | 33c84784 | Sofia Papagiannaki | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | 33c84784 | Sofia Papagiannaki | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | 33c84784 | Sofia Papagiannaki | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | 33c84784 | Sofia Papagiannaki | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | 33c84784 | Sofia Papagiannaki | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | 33c84784 | Sofia Papagiannaki | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | 33c84784 | Sofia Papagiannaki | # POSSIBILITY OF SUCH DAMAGE.
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28 | 33c84784 | Sofia Papagiannaki | #
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29 | 33c84784 | Sofia Papagiannaki | # The views and conclusions contained in the software and
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30 | 33c84784 | Sofia Papagiannaki | # documentation are those of the authors and should not be
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31 | 33c84784 | Sofia Papagiannaki | # interpreted as representing official policies, either expressed
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32 | 33c84784 | Sofia Papagiannaki | # or implied, of GRNET S.A.
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33 | 33c84784 | Sofia Papagiannaki | |
34 | 33c84784 | Sofia Papagiannaki | from django.http import HttpResponse |
35 | 33c84784 | Sofia Papagiannaki | |
36 | fed0b230 | Christos Stavrakakis | from objpool.http import PooledHTTPConnection |
37 | 33c84784 | Sofia Papagiannaki | |
38 | 5ad8eca1 | Kostas Papadimitriou | from synnefo.lib import join_urls |
39 | 5ad8eca1 | Kostas Papadimitriou | |
40 | 33c84784 | Sofia Papagiannaki | from .utils import fix_header, forward_header |
41 | 33c84784 | Sofia Papagiannaki | |
42 | 33c84784 | Sofia Papagiannaki | import urllib |
43 | 33c84784 | Sofia Papagiannaki | import urlparse |
44 | 33c84784 | Sofia Papagiannaki | |
45 | 142133fb | Kostas Papadimitriou | # We use proxy to delegate requests to another domain. Sending host specific
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46 | 142133fb | Kostas Papadimitriou | # headers (Host, Cookie) may cause confusion to the server we proxy to.
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47 | 142133fb | Kostas Papadimitriou | #
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48 | 142133fb | Kostas Papadimitriou | # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.10
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49 | 142133fb | Kostas Papadimitriou | # Connection and MUST NOT be communicated by proxies over further connections
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50 | f870efe2 | Sofia Papagiannaki | EXCLUDE_HEADERS = ['Host', 'Cookie', 'Connection', 'X-Forwarded-Host'] |
51 | 142133fb | Kostas Papadimitriou | |
52 | 33c84784 | Sofia Papagiannaki | |
53 | e3ff6830 | Georgios D. Tsoukalas | def proxy(request, proxy_base=None, target_base=None): |
54 | 33c84784 | Sofia Papagiannaki | kwargs = {} |
55 | 33c84784 | Sofia Papagiannaki | |
56 | e3ff6830 | Georgios D. Tsoukalas | if None in (proxy_base, target_base): |
57 | e3ff6830 | Georgios D. Tsoukalas | m = "proxy() needs both proxy_base and target_base argument not None"
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58 | e3ff6830 | Georgios D. Tsoukalas | raise AssertionError(m) |
59 | e3ff6830 | Georgios D. Tsoukalas | |
60 | e3ff6830 | Georgios D. Tsoukalas | parsed = urlparse.urlparse(target_base) |
61 | e3ff6830 | Georgios D. Tsoukalas | target_base = '/' + parsed.path.strip('/') |
62 | e3ff6830 | Georgios D. Tsoukalas | proxy_base = proxy_base.strip('/')
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63 | e3ff6830 | Georgios D. Tsoukalas | |
64 | 33c84784 | Sofia Papagiannaki | # prepare headers
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65 | 33c84784 | Sofia Papagiannaki | headers = dict(map(lambda (k, v): fix_header(k, v), |
66 | 33c84784 | Sofia Papagiannaki | filter(lambda (k, v): forward_header(k), |
67 | 33c84784 | Sofia Papagiannaki | request.META.iteritems()))) |
68 | 33c84784 | Sofia Papagiannaki | |
69 | 142133fb | Kostas Papadimitriou | # set X-Forwarded-For, if already set, pass it through, otherwise set it
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70 | 142133fb | Kostas Papadimitriou | # to the current request remote address
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71 | 142133fb | Kostas Papadimitriou | SOURCE_IP = request.META.get('REMOTE_ADDR', None) |
72 | 142133fb | Kostas Papadimitriou | if SOURCE_IP and not 'X-Forwarded-For' in headers: |
73 | 142133fb | Kostas Papadimitriou | headers['X-Forwarded-For'] = SOURCE_IP
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74 | 142133fb | Kostas Papadimitriou | |
75 | 142133fb | Kostas Papadimitriou | # request.META remains cleanup
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76 | 142133fb | Kostas Papadimitriou | for k in headers.keys(): |
77 | 142133fb | Kostas Papadimitriou | if '_' in k: |
78 | 142133fb | Kostas Papadimitriou | headers.pop(k) |
79 | 142133fb | Kostas Papadimitriou | |
80 | 142133fb | Kostas Papadimitriou | for k in EXCLUDE_HEADERS: |
81 | 142133fb | Kostas Papadimitriou | headers.pop(k, None)
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82 | 142133fb | Kostas Papadimitriou | |
83 | 33c84784 | Sofia Papagiannaki | kwargs['headers'] = headers
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84 | cfc4b87c | Christos Stavrakakis | kwargs['body'] = request.body
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85 | 33c84784 | Sofia Papagiannaki | |
86 | e3ff6830 | Georgios D. Tsoukalas | path = request.path.lstrip('/')
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87 | e3ff6830 | Georgios D. Tsoukalas | if path.startswith(proxy_base):
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88 | e3ff6830 | Georgios D. Tsoukalas | m = "request path '{0}' does not start with proxy_base '{1}'"
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89 | e3ff6830 | Georgios D. Tsoukalas | m = m.format(path, proxy_base) |
90 | e3ff6830 | Georgios D. Tsoukalas | path = path.replace(proxy_base, '', 1) |
91 | e3ff6830 | Georgios D. Tsoukalas | path = join_urls(target_base, path) |
92 | e3ff6830 | Georgios D. Tsoukalas | with PooledHTTPConnection(parsed.netloc, parsed.scheme) as conn: |
93 | 33c84784 | Sofia Papagiannaki | conn.request( |
94 | 33c84784 | Sofia Papagiannaki | request.method, |
95 | 5ad8eca1 | Kostas Papadimitriou | '?'.join([path, urllib.urlencode(request.GET)]), **kwargs)
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96 | 33c84784 | Sofia Papagiannaki | response = conn.getresponse() |
97 | 33c84784 | Sofia Papagiannaki | |
98 | 33c84784 | Sofia Papagiannaki | # turn httplib.HttpResponse to django.http.Response
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99 | 33c84784 | Sofia Papagiannaki | length = response.getheader('content-length', None) |
100 | 33c84784 | Sofia Papagiannaki | data = response.read(length) |
101 | 33c84784 | Sofia Papagiannaki | status = int(response.status)
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102 | 152e7bba | Georgios D. Tsoukalas | django_http_response = HttpResponse(data, status=status) |
103 | 152e7bba | Georgios D. Tsoukalas | # do we need to exclude any headers here?
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104 | 152e7bba | Georgios D. Tsoukalas | for name, value in response.getheaders(): |
105 | 152e7bba | Georgios D. Tsoukalas | django_http_response[name] = value |
106 | 152e7bba | Georgios D. Tsoukalas | return django_http_response |