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validate.pyo
� ۜSec @ sF d Z d g Z d d l Z d d l Z d d l m Z m Z m Z m Z d d l Z e j d � Z e j d � Z d e f d � � YZ d � Z d � Z d d d � � YZ d d d � � YZ d d d � � YZ d d d � � YZ d d! d � � YZ d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d S(" s" 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 validatori����N( t DictTypet StringTypet TupleTypet ListTypes ^[a-zA-Z][a-zA-Z0-9\-_]*$s [\000-\037]t WSGIWarningc B s e Z d Z RS( s: Raised in response to WSGI-spec-related warnings ( t __name__t __module__t __doc__( ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR z s c G s | s t | � � n d S( N( t AssertionError( t condt args( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt assert_ s c s � f d � } | S( s� When applied between a WSGI server and a WSGI application, this middleware will check for WSGI compliancy on a number of levels. This middleware does not modify the request or response in any way, but will raise an AssertionError if anything seems off (except for a failure to close the application iterator, which will be printed to stderr -- there's no way to raise an exception at that point). c s� t t | � d k d � t | d � | \ } � t | � g � � � f d � } t | d � | d <t | d � | d <� | | � } t | d k o� | t k d � t | � t | � � S( Ni s Two arguments requireds No keyword arguments allowedc s� t t | � d k p$ t | � d k d | f � t | d � | d } | d } t | � d k rs | d } n d } t | � t | � t | | � t | � � j d � t � | � � S( Ni i s Invalid number of arguments: %ss No keyword arguments allowedi i ( R t lent Nonet check_statust check_headerst check_content_typet check_exc_infot appendt WriteWrapper( R t kwt statust headerst exc_info( t start_responset start_response_started( s( /usr/lib64/python2.7/wsgiref/validate.pyt start_response_wrapper� s $ s wsgi.inputs wsgi.errorss> The application must return an iterator, if only an empty list( R R t check_environt InputWrappert ErrorWrapperR t Falset check_iteratort IteratorWrapper( R R t environR t iterator( t application( R R s( /usr/lib64/python2.7/wsgiref/validate.pyt lint_app� s ( ( R$ R% ( ( R$ s( /usr/lib64/python2.7/wsgiref/validate.pyR � s )R c B s> e Z d � Z d � Z d � Z d � Z d � Z d � Z RS( c C s | | _ d S( N( t input( t selft wsgi_input( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt __init__� s c G sH t t | � d k � | j j | � } t t | � t d � k � | S( Ni t ( R R R& t readt type( R' R t v( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR+ � s c C s/ | j j � } t t | � t d � k � | S( NR* ( R& t readlineR R, ( R' R- ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR. � s c G su t t | � d k � | j j | � } t t | � t g � k � x* | D]" } t t | � t d � k � qK W| S( Ni R* ( R R R& t readlinesR, ( R' R t linest line( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR/ � s c c s% x | j � } | s d S| Vq d S( N( R. ( R' R1 ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt __iter__� s c C s t d d � d S( Ni s input.close() must not be called( R ( R' ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt close� s ( R R R) R+ R. R/ R2 R3 ( ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR � s R c B s5 e Z d � Z d � Z d � Z d � Z d � Z RS( c C s | | _ d S( N( t errors( R' t wsgi_errors( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR) � s c C s0 t t | � t d � k � | j j | � d S( NR* ( R R, R4 t write( R' t s( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR6 � s c C s | j j � d S( N( R4 t flush( R' ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR8 � s c C s" x | D] } | j | � q Wd S( N( R6 ( R' t seqR1 ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt writelines� s c C s t d d � d S( Ni s! errors.close() must not be called( R ( R' ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR3 � s ( R R R) R6 R8 R: R3 ( ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR � s R c B s e Z d � Z d � Z RS( c C s | | _ d S( N( t writer( R' t wsgi_writer( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR) � s c C s- t t | � t d � k � | j | � d S( NR* ( R R, R; ( R' R7 ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt __call__� s ( R R R) R= ( ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR � s t PartialIteratorWrapperc B s e Z d � Z d � Z RS( c C s | | _ d S( N( R# ( R' t wsgi_iterator( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR) � s c C s t | j d � S( N( R! R# R ( R' ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR2 � s ( R R R) R2 ( ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR> � s R! c B s5 e Z d � Z d � Z d � Z d � Z d � Z RS( c C s. | | _ t | � | _ t | _ | | _ d S( N( t original_iteratort iterR# R t closedt check_start_response( R' R? RC ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR) s c C s | S( N( ( R' ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR2 s c C sO t | j d � | j j � } | j d k rK t | j d � d | _ n | S( Ns Iterator read after closedsj The application returns and we started iterating over its body, but start_response has not yet been called( R RB R# t nextRC R ( R' R- ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyRD s c C s/ t | _ t | j d � r+ | j j � n d S( NR3 ( t TrueRB t hasattrR@ R3 ( R' ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR3 s c C s0 | j s t j j d � n t | j d � d S( Ns/ Iterator garbage collected without being closed( RB t syst stderrR6 R ( R' ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt __del__ s ( R R R) R2 RD R3 RI ( ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR! s c C s� t t | � t k d t | � | f � xC d d d d d d d d d g D] } t | | k d | f � qK Wx5 d d g D]' } t | | k d | | d f � q| Wd | k r� t j d t � n x^ | j � D]P } d | k r� q� n t t | | � t k d | t | | � | | f � q� Wt t | d � t k d | d f � t | d d+ k d | d � t | d � t | d � | d d, k r�t j d | d t � n t | j d! � p�| d! j d" � d# | d! � t | j d$ � p | d$ j d" � d% | d$ � | j d& � rPt t | d& � d' k d( | d& � n | j d! � sut d$ | k d) � n t | j d! � d" k d* � d S(- Ns: Environment is not of the right type: %r (environment: %r)t REQUEST_METHODt SERVER_NAMEt SERVER_PORTs wsgi.versions wsgi.inputs wsgi.errorss wsgi.multithreads wsgi.multiprocesss wsgi.run_onces$ Environment missing required key: %rt HTTP_CONTENT_TYPEt HTTP_CONTENT_LENGTHs8 Environment should not have the key: %s (use %s instead)i t QUERY_STRINGs� 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 likelyt .s9 Environmental variable %s is not a string: %r (value: %r)s# wsgi.version should be a tuple (%r)s wsgi.url_schemet httpt httpss wsgi.url_scheme unknown: %rt GETt HEADt POSTt OPTIONSt PUTt DELETEt TRACEs Unknown REQUEST_METHOD: %rt SCRIPT_NAMEt /s$ SCRIPT_NAME doesn't start with /: %rt PATH_INFOs" PATH_INFO doesn't start with /: %rt CONTENT_LENGTHi s Invalid CONTENT_LENGTH: %rsg One of SCRIPT_NAME or PATH_INFO are required (PATH_INFO should at least be '/' if SCRIPT_NAME is empty)sO SCRIPT_NAME cannot be '/'; it should instead be '', and PATH_INFO should be '/'( RQ RR ( RS RT RU RV RW RX RY ( R R, R t warningst warnR t keysR R t check_inputt check_errorst gett startswitht int( R" t key( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR " s` # c C sA x: d d d d g D]& } t t | | � d | | f � q Wd S( NR+ R. R/ R2 s- wsgi.input (%r) doesn't have the attribute %s( R RF ( R( t attr( ( s( /usr/lib64/python2.7/wsgiref/validate.pyRa c s c C s> x7 d d d g D]& } t t | | � d | | f � q Wd S( NR8 R6 R: s. wsgi.errors (%r) doesn't have the attribute %s( R RF ( R5 Rg ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyRb i s c C s� t t | � t k d | � | j d d � d } t t | � d k d | � t | � } t | d k d | � t | � d k s� | d d k r� t j d | t � n d S( Ns Status must be a string (not %r)i i i s) Status codes must be three characters: %rid s Status code is invalid: %ri t sj The status string (%r) should be a three-digit integer followed by a single space and a status explanation( R R, R t splitR R Re R^ R_ R ( R t status_codet status_int( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR o s "c C s_ t t | � t k d | t | � f � i } x)| D]!} t t | � t k d | t | � f � t t | � d k � | \ } } t | j � d k d | � d | | j � <t d | k o� d | k d | � t t j | � d | � t | j d � o| j d � d | � t j | � r6 t d d | t j | � j d � f � q6 q6 Wd S( Ns% Headers (%r) must be of type list: %rs1 Individual headers (%r) must be of type tuple: %ri R sy The Status header cannot be used; it conflicts with CGI script, and HTTP status is not given through headers (value: %r).s t :s, Header names may not contain ':' or '\n': %rs Bad header name: %rt -t _s# Names may not end in '-' or '_': %ri s# Bad header value: %r (bad char: %r)( R R, R R R t lowerR t header_ret searcht endswitht bad_header_value_ret group( R t header_namest itemt namet value( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR ~ s, c C s� t | j d d � d � } d } xJ | D]B \ } } | j � d k r) | | k rW d St d d | � q) q) W| | k r� t d d | � n d S( Ni i i� i0 s content-typesJ Content-Type header found in a %s response, which must not return content.s, No Content-Type header found in headers (%s)( i� i0 ( Re Ri R Ro R ( R R t codet NO_MESSAGE_BODYRw Rx ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR � s c C s? t | d k p$ t | � t d � k d | t | � f � d S( Ns exc_info (%r) is not a tuple: %r( ( R R R, ( R ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR � s $c C s t t | t � d � d S( Nsv You should not return a string as your application iterator, instead return a single-item list containing that string.( R t isinstancet str( R# ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyR � s ( ( ( ( ( ( R t __all__t reRG t typesR R R R R^ t compileRp Rs t WarningR R R R R R R> R! R Ra Rb R R R R R ( ( ( s( /usr/lib64/python2.7/wsgiref/validate.pyt <module>n s. " 7" ! A