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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).
Ú validatoré Nz^[a-zA-Z][a-zA-Z0-9\-_]*$z [\000-\037]c @ s e Z d Z d Z d S)Ú WSGIWarningz:
Raised in response to WSGI-spec-related warnings
N)Ú__name__Ú
__module__Ú __qualname__Ú__doc__© r r ú5/opt/alt/python34/lib64/python3.4/wsgiref/validate.pyr y s r c G s | s t | Œ ‚ n d S)N)ÚAssertionError)ZcondÚargsr r r Úassert_~ s r c C s8 t | ƒ t k r | St d j | t | ƒ ƒ ƒ ‚ d S)Nz!{0} must be of type str (got {1}))ÚtypeÚstrr
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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).
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zErrorWrapper.writelinesc C s t d d ƒ d S)Nr z!errors.close() must not be called)r )r/ r r r r; ò s zErrorWrapper.closeN)r r r r1 r> r@ rB r; r r r r r' â s
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r3 rC )r/ r? r r r Ú__call__ú s zWriteWrapper.__call__N)r r r r1 rD r r r r r õ s r c @ s( e Z d Z d d „ Z d d „ Z d S)ÚPartialIteratorWrapperc C s
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wsgi_iteratorr r r r1 s z PartialIteratorWrapper.__init__c C s t | j d ƒ S)N)r) r+ )r/ r r r r: s z PartialIteratorWrapper.__iter__N)r r r r1 r: r r r r rE þ s rE c @ sL e Z d Z d d „ Z d d „ Z d d „ Z d d „ Z d d
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zIteratorWrapper.__next__c C s/ d | _ t | j d ƒ r+ | j j ƒ n d S)NTr; )rI ÚhasattrrG r; )r/ r r r r; s zIteratorWrapper.closec C s0 | j s t j j d ƒ n t | j d ƒ d S)Nz/Iterator garbage collected without being closed)rI ÚsysÚstderrr> r )r/ r r r Ú__del__# s
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| d' ƒ d( k d) | d' ƒ n | j d" ƒ s{t d% | k d* ƒ n t | j d" ƒ d# k d+ ƒ d S).Nz:Environment is not of the right type: %r (environment: %r)ZREQUEST_METHODZ SERVER_NAMEZ SERVER_PORTz wsgi.versionz
wsgi.inputz wsgi.errorszwsgi.multithreadzwsgi.multiprocessz
wsgi.run_oncez$Environment missing required key: %rZHTTP_CONTENT_TYPEZHTTP_CONTENT_LENGTHz8Environment should not have the key: %s (use %s instead)é Z QUERY_STRINGz’QUERY_STRING is not in the WSGI environment; the cgi module will use sys.argv when this variable is missing, so application errors are more likelyÚ.z9Environmental variable %s is not a string: %r (value: %r)z#wsgi.version should be a tuple (%r)zwsgi.url_schemeÚhttpÚhttpszwsgi.url_scheme unknown: %rÚGETÚHEADÚPOSTÚOPTIONSÚPATCHÚPUTÚDELETEÚTRACEzUnknown REQUEST_METHOD: %rZ SCRIPT_NAMEú/z$SCRIPT_NAME doesn't start with /: %rZ PATH_INFOz"PATH_INFO doesn't start with /: %rZCONTENT_LENGTHr zInvalid CONTENT_LENGTH: %rzgOne of SCRIPT_NAME or PATH_INFO are required (PATH_INFO should at least be '/' if SCRIPT_NAME is empty)zOSCRIPT_NAME cannot be '/'; it should instead be '', and PATH_INFO should be '/')rS rT )rU rV rW rX rY rZ r[ r\ )r r
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