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import sys 

from threading import Lock 

try: 

    from cStringIO import StringIO 

except ImportError: 

    from StringIO import StringIO 

 

from django import http 

from django.core import signals 

from django.core.handlers import base 

from django.core.urlresolvers import set_script_prefix 

from django.utils import datastructures 

from django.utils.encoding import force_unicode, iri_to_uri 

from django.utils.log import getLogger 

 

logger = getLogger('django.request') 

 

 

# See http://www.iana.org/assignments/http-status-codes 

STATUS_CODE_TEXT = { 

    100: 'CONTINUE', 

    101: 'SWITCHING PROTOCOLS', 

    102: 'PROCESSING', 

    200: 'OK', 

    201: 'CREATED', 

    202: 'ACCEPTED', 

    203: 'NON-AUTHORITATIVE INFORMATION', 

    204: 'NO CONTENT', 

    205: 'RESET CONTENT', 

    206: 'PARTIAL CONTENT', 

    207: 'MULTI-STATUS', 

    208: 'ALREADY REPORTED', 

    226: 'IM USED', 

    300: 'MULTIPLE CHOICES', 

    301: 'MOVED PERMANENTLY', 

    302: 'FOUND', 

    303: 'SEE OTHER', 

    304: 'NOT MODIFIED', 

    305: 'USE PROXY', 

    306: 'RESERVED', 

    307: 'TEMPORARY REDIRECT', 

    400: 'BAD REQUEST', 

    401: 'UNAUTHORIZED', 

    402: 'PAYMENT REQUIRED', 

    403: 'FORBIDDEN', 

    404: 'NOT FOUND', 

    405: 'METHOD NOT ALLOWED', 

    406: 'NOT ACCEPTABLE', 

    407: 'PROXY AUTHENTICATION REQUIRED', 

    408: 'REQUEST TIMEOUT', 

    409: 'CONFLICT', 

    410: 'GONE', 

    411: 'LENGTH REQUIRED', 

    412: 'PRECONDITION FAILED', 

    413: 'REQUEST ENTITY TOO LARGE', 

    414: 'REQUEST-URI TOO LONG', 

    415: 'UNSUPPORTED MEDIA TYPE', 

    416: 'REQUESTED RANGE NOT SATISFIABLE', 

    417: 'EXPECTATION FAILED', 

    422: 'UNPROCESSABLE ENTITY', 

    423: 'LOCKED', 

    424: 'FAILED DEPENDENCY', 

    426: 'UPGRADE REQUIRED', 

    500: 'INTERNAL SERVER ERROR', 

    501: 'NOT IMPLEMENTED', 

    502: 'BAD GATEWAY', 

    503: 'SERVICE UNAVAILABLE', 

    504: 'GATEWAY TIMEOUT', 

    505: 'HTTP VERSION NOT SUPPORTED', 

    506: 'VARIANT ALSO NEGOTIATES', 

    507: 'INSUFFICIENT STORAGE', 

    508: 'LOOP DETECTED', 

    510: 'NOT EXTENDED', 

} 

 

class LimitedStream(object): 

    ''' 

    LimitedStream wraps another stream in order to not allow reading from it 

    past specified amount of bytes. 

    ''' 

    def __init__(self, stream, limit, buf_size=64 * 1024 * 1024): 

        self.stream = stream 

        self.remaining = limit 

        self.buffer = '' 

        self.buf_size = buf_size 

 

    def _read_limited(self, size=None): 

        if size is None or size > self.remaining: 

            size = self.remaining 

        if size == 0: 

            return '' 

        result = self.stream.read(size) 

        self.remaining -= len(result) 

        return result 

 

    def read(self, size=None): 

        if size is None: 

            result = self.buffer + self._read_limited() 

            self.buffer = '' 

        elif size < len(self.buffer): 

            result = self.buffer[:size] 

            self.buffer = self.buffer[size:] 

        else: # size >= len(self.buffer) 

            result = self.buffer + self._read_limited(size - len(self.buffer)) 

            self.buffer = '' 

        return result 

 

    def readline(self, size=None): 

        while '\n' not in self.buffer and \ 

              (size is None or len(self.buffer) < size): 

            if size: 

                # since size is not None here, len(self.buffer) < size 

                chunk = self._read_limited(size - len(self.buffer)) 

            else: 

                chunk = self._read_limited() 

            if not chunk: 

                break 

            self.buffer += chunk 

        sio = StringIO(self.buffer) 

        if size: 

            line = sio.readline(size) 

        else: 

            line = sio.readline() 

        self.buffer = sio.read() 

        return line 

 

 

class WSGIRequest(http.HttpRequest): 

    def __init__(self, environ): 

        script_name = base.get_script_name(environ) 

        path_info = force_unicode(environ.get('PATH_INFO', u'/')) 

        if not path_info or path_info == script_name: 

            # Sometimes PATH_INFO exists, but is empty (e.g. accessing 

            # the SCRIPT_NAME URL without a trailing slash). We really need to 

            # operate as if they'd requested '/'. Not amazingly nice to force 

            # the path like this, but should be harmless. 

            # 

            # (The comparison of path_info to script_name is to work around an 

            # apparent bug in flup 1.0.1. Se Django ticket #8490). 

            path_info = u'/' 

        self.environ = environ 

        self.path_info = path_info 

        self.path = '%s%s' % (script_name, path_info) 

        self.META = environ 

        self.META['PATH_INFO'] = path_info 

        self.META['SCRIPT_NAME'] = script_name 

        self.method = environ['REQUEST_METHOD'].upper() 

        self._post_parse_error = False 

        try: 

            content_length = int(self.environ.get('CONTENT_LENGTH')) 

        except (ValueError, TypeError): 

            content_length = 0 

        self._stream = LimitedStream(self.environ['wsgi.input'], content_length) 

        self._read_started = False 

 

    def get_full_path(self): 

        # RFC 3986 requires query string arguments to be in the ASCII range. 

        # Rather than crash if this doesn't happen, we encode defensively. 

        return '%s%s' % (self.path, self.environ.get('QUERY_STRING', '') and ('?' + iri_to_uri(self.environ.get('QUERY_STRING', ''))) or '') 

 

    def is_secure(self): 

        return 'wsgi.url_scheme' in self.environ \ 

            and self.environ['wsgi.url_scheme'] == 'https' 

 

    def _get_request(self): 

        if not hasattr(self, '_request'): 

            self._request = datastructures.MergeDict(self.POST, self.GET) 

        return self._request 

 

    def _get_get(self): 

        if not hasattr(self, '_get'): 

            # The WSGI spec says 'QUERY_STRING' may be absent. 

            self._get = http.QueryDict(self.environ.get('QUERY_STRING', ''), encoding=self._encoding) 

        return self._get 

 

    def _set_get(self, get): 

        self._get = get 

 

    def _get_post(self): 

        if not hasattr(self, '_post'): 

            self._load_post_and_files() 

        return self._post 

 

    def _set_post(self, post): 

        self._post = post 

 

    def _get_cookies(self): 

        if not hasattr(self, '_cookies'): 

            self._cookies = http.parse_cookie(self.environ.get('HTTP_COOKIE', '')) 

        return self._cookies 

 

    def _set_cookies(self, cookies): 

        self._cookies = cookies 

 

    def _get_files(self): 

        if not hasattr(self, '_files'): 

            self._load_post_and_files() 

        return self._files 

 

    GET = property(_get_get, _set_get) 

    POST = property(_get_post, _set_post) 

    COOKIES = property(_get_cookies, _set_cookies) 

    FILES = property(_get_files) 

    REQUEST = property(_get_request) 

 

 

class WSGIHandler(base.BaseHandler): 

    initLock = Lock() 

    request_class = WSGIRequest 

 

    def __call__(self, environ, start_response): 

        # Set up middleware if needed. We couldn't do this earlier, because 

        # settings weren't available. 

        if self._request_middleware is None: 

            self.initLock.acquire() 

            try: 

                try: 

                    # Check that middleware is still uninitialised. 

                    if self._request_middleware is None: 

                        self.load_middleware() 

                except: 

                    # Unload whatever middleware we got 

                    self._request_middleware = None 

                    raise 

            finally: 

                self.initLock.release() 

 

        set_script_prefix(base.get_script_name(environ)) 

        signals.request_started.send(sender=self.__class__) 

        try: 

            try: 

                request = self.request_class(environ) 

            except UnicodeDecodeError: 

                logger.warning('Bad Request (UnicodeDecodeError)', 

                    exc_info=sys.exc_info(), 

                    extra={ 

                        'status_code': 400, 

                    } 

                ) 

                response = http.HttpResponseBadRequest() 

            else: 

                response = self.get_response(request) 

        finally: 

            signals.request_finished.send(sender=self.__class__) 

 

        try: 

            status_text = STATUS_CODE_TEXT[response.status_code] 

        except KeyError: 

            status_text = 'UNKNOWN STATUS CODE' 

        status = '%s %s' % (response.status_code, status_text) 

        response_headers = [(str(k), str(v)) for k, v in response.items()] 

        for c in response.cookies.values(): 

            response_headers.append(('Set-Cookie', str(c.output(header='')))) 

        start_response(status, response_headers) 

        return response