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Middleware to check for obedience to the WSGI specification.

Some of the things this checks:

* Signature of the application and start_response (including that
  keyword arguments are not used).

* Environment checks:

  - Environment is a dictionary (and not a subclass).

  - That all the required keys are in the environment: REQUEST_METHOD,
    SERVER_NAME, SERVER_PORT, wsgi.version, wsgi.input, wsgi.errors,
    wsgi.multithread, wsgi.multiprocess, wsgi.run_once

  - That HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH are not in the
    environment (these headers should appear as CONTENT_LENGTH and
    CONTENT_TYPE).

  - Warns if QUERY_STRING is missing, as the cgi module acts
    unpredictably in that case.

  - That CGI-style variables (that don't contain a .) have
    (non-unicode) string values

  - That wsgi.version is a tuple

  - That wsgi.url_scheme is 'http' or 'https' (@@: is this too
    restrictive?)

  - Warns if the REQUEST_METHOD is not known (@@: probably too
    restrictive).

  - That SCRIPT_NAME and PATH_INFO are empty or start with /

  - That at least one of SCRIPT_NAME or PATH_INFO are set.

  - That CONTENT_LENGTH is a positive integer.

  - That SCRIPT_NAME is not '/' (it should be '', and PATH_INFO should
    be '/').

  - That wsgi.input has the methods read, readline, readlines, and
    __iter__

  - That wsgi.errors has the methods flush, write, writelines

* The status is a string, contains a space, starts with an integer,
  and that integer is in range (> 100).

* That the headers is a list (not a subclass, not another kind of
  sequence).

* That the items of the headers are tuples of strings.

* That there is no 'status' header (that is used in CGI, but not in
  WSGI).

* That the headers don't contain newlines or colons, end in _ or -, or
  contain characters codes below 037.

* That Content-Type is given if there is content (CGI often has a
  default content type, but WSGI does not).

* That no Content-Type is given when there is no content (@@: is this
  too restrictive?)

* That the exc_info argument to start_response is a tuple or None.

* That all calls to the writer are with strings, and no other methods
  on the writer are accessed.

* That wsgi.input is used properly:

  - .read() is called with zero or one argument

  - That it returns a string

  - That readline, readlines, and __iter__ return strings

  - That .close() is not called

  - No other methods are provided

* That wsgi.errors is used properly:

  - .write() and .writelines() is called with a string

  - That .close() is not called, and no other methods are provided.

* The response iterator:

  - That it is not a string (it should be a list of a single string; a
    string will work, but perform horribly).

  - That .next() returns a string

  - That the iterator is not iterated over until start_response has
    been called (that can signal either a server or application
    error).

  - That .close() is called (doesn't raise exception, only prints to
    sys.stderr, because we only know it isn't called when the object
    is garbage collected).
t	validatoriÿÿÿÿN(tDictTypet
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    When applied between a WSGI server and a WSGI application, this
    middleware will check for WSGI compliancy on a number of levels.
    This middleware does not modify the request or response in any
    way, but will raise an AssertionError if anything seems off
    (except for a failure to close the application iterator, which
    will be printed to stderr -- there's no way to raise an exception
    at that point).
    csÂtt|ƒdkdƒt|dƒ|\}‰t|ƒg‰‡‡fd†}t|dƒ|d<t|dƒ|d<ˆ||ƒ}t|dk	o¤|tkdƒt|ƒt|ˆƒS(NisTwo arguments requiredsNo keyword arguments allowedcsÁtt|ƒdkp$t|ƒdkd|fƒt|dƒ|d}|d}t|ƒdkrs|d}nd}t|ƒt|ƒt||ƒt|ƒˆjdƒtˆ|ŒƒS(NiisInvalid number of arguments: %ssNo keyword arguments allowedii(	RtlentNonetcheck_statust
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cCstddƒdS(Nis input.close() must not be called(R(R'((s(/usr/lib64/python2.7/wsgiref/validate.pytcloseÙs(RRR)R+R.R/R2R3(((s(/usr/lib64/python2.7/wsgiref/validate.pyRºs					RcBs5eZd„Zd„Zd„Zd„Zd„ZRS(cCs
||_dS(N(terrors(R'twsgi_errors((s(/usr/lib64/python2.7/wsgiref/validate.pyR)ÞscCs0tt|ƒtdƒkƒ|jj|ƒdS(NR*(RR,R4twrite(R'ts((s(/usr/lib64/python2.7/wsgiref/validate.pyR6áscCs|jjƒdS(N(R4tflush(R'((s(/usr/lib64/python2.7/wsgiref/validate.pyR8åscCs"x|D]}|j|ƒqWdS(N(R6(R'tseqR1((s(/usr/lib64/python2.7/wsgiref/validate.pyt
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	cCs/t|_t|jdƒr+|jjƒndS(NR3(tTrueRBthasattrR@R3(R'((s(/usr/lib64/python2.7/wsgiref/validate.pyR3s	cCs0|jstjjdƒnt|jdƒdS(Ns/Iterator garbage collected without being closed(RBtsyststderrR6R(R'((s(/usr/lib64/python2.7/wsgiref/validate.pyt__del__s
		
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