app/django/core/handlers/wsgi.py
author Mario Ferraro <fadinlight@gmail.com>
Sun, 15 Nov 2009 22:12:20 +0100
changeset 3093 d1be59b6b627
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
GMaps related JS changed to use new google namespace. Google is going to change permanently in the future the way to load its services, so better stay safe. Also this commit shows uses of the new melange.js module. Fixes Issue 634.
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from threading import Lock
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from pprint import pformat
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try:
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    from cStringIO import StringIO
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except ImportError:
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    from StringIO import StringIO
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from django import http
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from django.core import signals
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from django.core.handlers import base
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from django.core.urlresolvers import set_script_prefix
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from django.utils import datastructures
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from django.utils.encoding import force_unicode
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# See http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
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STATUS_CODE_TEXT = {
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    100: 'CONTINUE',
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    101: 'SWITCHING PROTOCOLS',
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    200: 'OK',
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    201: 'CREATED',
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    202: 'ACCEPTED',
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    203: 'NON-AUTHORITATIVE INFORMATION',
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    204: 'NO CONTENT',
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    205: 'RESET CONTENT',
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    206: 'PARTIAL CONTENT',
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    300: 'MULTIPLE CHOICES',
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    301: 'MOVED PERMANENTLY',
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    302: 'FOUND',
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    303: 'SEE OTHER',
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    304: 'NOT MODIFIED',
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    305: 'USE PROXY',
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    306: 'RESERVED',
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    307: 'TEMPORARY REDIRECT',
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    400: 'BAD REQUEST',
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    401: 'UNAUTHORIZED',
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    402: 'PAYMENT REQUIRED',
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    403: 'FORBIDDEN',
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    404: 'NOT FOUND',
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    405: 'METHOD NOT ALLOWED',
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    406: 'NOT ACCEPTABLE',
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    407: 'PROXY AUTHENTICATION REQUIRED',
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    408: 'REQUEST TIMEOUT',
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    409: 'CONFLICT',
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    410: 'GONE',
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    411: 'LENGTH REQUIRED',
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    412: 'PRECONDITION FAILED',
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    413: 'REQUEST ENTITY TOO LARGE',
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    414: 'REQUEST-URI TOO LONG',
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    415: 'UNSUPPORTED MEDIA TYPE',
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    416: 'REQUESTED RANGE NOT SATISFIABLE',
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    417: 'EXPECTATION FAILED',
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    500: 'INTERNAL SERVER ERROR',
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    501: 'NOT IMPLEMENTED',
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    502: 'BAD GATEWAY',
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    503: 'SERVICE UNAVAILABLE',
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    504: 'GATEWAY TIMEOUT',
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    505: 'HTTP VERSION NOT SUPPORTED',
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}
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def safe_copyfileobj(fsrc, fdst, length=16*1024, size=0):
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    """
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    A version of shutil.copyfileobj that will not read more than 'size' bytes.
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    This makes it safe from clients sending more than CONTENT_LENGTH bytes of
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    data in the body.
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    """
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    if not size:
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        return
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    while size > 0:
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        buf = fsrc.read(min(length, size))
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        if not buf:
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            break
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        fdst.write(buf)
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        size -= len(buf)
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class WSGIRequest(http.HttpRequest):
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    def __init__(self, environ):
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        script_name = base.get_script_name(environ)
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        path_info = force_unicode(environ.get('PATH_INFO', u'/'))
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        if not path_info or path_info == script_name:
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            # Sometimes PATH_INFO exists, but is empty (e.g. accessing
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            # the SCRIPT_NAME URL without a trailing slash). We really need to
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            # operate as if they'd requested '/'. Not amazingly nice to force
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            # the path like this, but should be harmless.
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            #
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            # (The comparison of path_info to script_name is to work around an
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            # apparent bug in flup 1.0.1. Se Django ticket #8490).
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            path_info = u'/'
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        self.environ = environ
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        self.path_info = path_info
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        self.path = '%s%s' % (script_name, path_info)
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        self.META = environ
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        self.META['PATH_INFO'] = path_info
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        self.META['SCRIPT_NAME'] = script_name
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        self.method = environ['REQUEST_METHOD'].upper()
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        self._post_parse_error = False
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    def __repr__(self):
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        # Since this is called as part of error handling, we need to be very
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        # robust against potentially malformed input.
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        try:
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            get = pformat(self.GET)
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        except:
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            get = '<could not parse>'
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        if self._post_parse_error:
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            post = '<could not parse>'
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        else:
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            try:
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                post = pformat(self.POST)
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            except:
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                post = '<could not parse>'
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        try:
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            cookies = pformat(self.COOKIES)
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        except:
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            cookies = '<could not parse>'
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        try:
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            meta = pformat(self.META)
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        except:
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            meta = '<could not parse>'
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        return '<WSGIRequest\nGET:%s,\nPOST:%s,\nCOOKIES:%s,\nMETA:%s>' % \
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            (get, post, cookies, meta)
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    def get_full_path(self):
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        return '%s%s' % (self.path, self.environ.get('QUERY_STRING', '') and ('?' + self.environ.get('QUERY_STRING', '')) or '')
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    def is_secure(self):
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        return 'wsgi.url_scheme' in self.environ \
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            and self.environ['wsgi.url_scheme'] == 'https'
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   128
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    def _load_post_and_files(self):
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        # Populates self._post and self._files
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   131
        if self.method == 'POST':
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            if self.environ.get('CONTENT_TYPE', '').startswith('multipart'):
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                self._raw_post_data = ''
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                try:
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                    self._post, self._files = self.parse_file_upload(self.META, self.environ['wsgi.input'])
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   136
                except:
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                    # An error occured while parsing POST data.  Since when
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   138
                    # formatting the error the request handler might access
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   139
                    # self.POST, set self._post and self._file to prevent
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                    # attempts to parse POST data again.
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                    self._post = http.QueryDict('')
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                    self._files = datastructures.MultiValueDict()
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   143
                    # Mark that an error occured.  This allows self.__repr__ to
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   144
                    # be explicit about it instead of simply representing an
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                    # empty POST
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   146
                    self._post_parse_error = True
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                    raise
54
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            else:
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                self._post, self._files = http.QueryDict(self.raw_post_data, encoding=self._encoding), datastructures.MultiValueDict()
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        else:
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            self._post, self._files = http.QueryDict('', encoding=self._encoding), datastructures.MultiValueDict()
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   152
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    def _get_request(self):
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        if not hasattr(self, '_request'):
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            self._request = datastructures.MergeDict(self.POST, self.GET)
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        return self._request
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   157
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    def _get_get(self):
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   159
        if not hasattr(self, '_get'):
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   160
            # The WSGI spec says 'QUERY_STRING' may be absent.
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            self._get = http.QueryDict(self.environ.get('QUERY_STRING', ''), encoding=self._encoding)
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        return self._get
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   163
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    def _set_get(self, get):
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        self._get = get
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   166
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    def _get_post(self):
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        if not hasattr(self, '_post'):
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            self._load_post_and_files()
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   170
        return self._post
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   171
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    def _set_post(self, post):
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   173
        self._post = post
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   174
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   175
    def _get_cookies(self):
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   176
        if not hasattr(self, '_cookies'):
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   177
            self._cookies = http.parse_cookie(self.environ.get('HTTP_COOKIE', ''))
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        return self._cookies
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   179
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    def _set_cookies(self, cookies):
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        self._cookies = cookies
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   182
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   183
    def _get_files(self):
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   184
        if not hasattr(self, '_files'):
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   185
            self._load_post_and_files()
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   186
        return self._files
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   187
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   188
    def _get_raw_post_data(self):
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   189
        try:
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   190
            return self._raw_post_data
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   191
        except AttributeError:
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   192
            buf = StringIO()
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   193
            try:
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   194
                # CONTENT_LENGTH might be absent if POST doesn't have content at all (lighttpd)
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   195
                content_length = int(self.environ.get('CONTENT_LENGTH', 0))
323
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   196
            except (ValueError, TypeError):
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   197
                # If CONTENT_LENGTH was empty string or not an integer, don't
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   198
                # error out. We've also seen None passed in here (against all
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   199
                # specs, but see ticket #8259), so we handle TypeError as well.
54
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   200
                content_length = 0
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   201
            if content_length > 0:
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   202
                safe_copyfileobj(self.environ['wsgi.input'], buf,
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   203
                        size=content_length)
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   204
            self._raw_post_data = buf.getvalue()
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   205
            buf.close()
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   206
            return self._raw_post_data
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   207
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   208
    GET = property(_get_get, _set_get)
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   209
    POST = property(_get_post, _set_post)
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   210
    COOKIES = property(_get_cookies, _set_cookies)
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   211
    FILES = property(_get_files)
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   212
    REQUEST = property(_get_request)
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   213
    raw_post_data = property(_get_raw_post_data)
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   214
323
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   215
class WSGIHandler(base.BaseHandler):
54
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   216
    initLock = Lock()
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   217
    request_class = WSGIRequest
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   218
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   219
    def __call__(self, environ, start_response):
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   220
        from django.conf import settings
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   221
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   222
        # Set up middleware if needed. We couldn't do this earlier, because
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   223
        # settings weren't available.
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   224
        if self._request_middleware is None:
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   225
            self.initLock.acquire()
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   226
            # Check that middleware is still uninitialised.
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   227
            if self._request_middleware is None:
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   228
                self.load_middleware()
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   229
            self.initLock.release()
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diff changeset
   230
323
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diff changeset
   231
        set_script_prefix(base.get_script_name(environ))
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diff changeset
   232
        signals.request_started.send(sender=self.__class__)
54
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diff changeset
   233
        try:
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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diff changeset
   234
            try:
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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diff changeset
   235
                request = self.request_class(environ)
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diff changeset
   236
            except UnicodeDecodeError:
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diff changeset
   237
                response = http.HttpResponseBadRequest()
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diff changeset
   238
            else:
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diff changeset
   239
                response = self.get_response(request)
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diff changeset
   240
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   241
                # Apply response middleware
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   242
                for middleware_method in self._response_middleware:
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   243
                    response = middleware_method(request, response)
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diff changeset
   244
                response = self.apply_response_fixes(request, response)
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   245
        finally:
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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diff changeset
   246
            signals.request_finished.send(sender=self.__class__)
54
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diff changeset
   247
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   248
        try:
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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   249
            status_text = STATUS_CODE_TEXT[response.status_code]
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   250
        except KeyError:
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            status_text = 'UNKNOWN STATUS CODE'
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        status = '%s %s' % (response.status_code, status_text)
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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        response_headers = [(str(k), str(v)) for k, v in response.items()]
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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        for c in response.cookies.values():
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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            response_headers.append(('Set-Cookie', str(c.output(header=''))))
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        start_response(status, response_headers)
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        return response
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
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