509318396 ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ 3 \;;@sdZdgZddlZddlZddlZejdZejdZGdddeZ dd Z d d Z d dZ Gd ddZ GdddZGdddZGdddZGdddZddZddZddZddZdd Zd!d"Zd#d$Zd%d&ZdS)'a& 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). validatorNz^[a-zA-Z][a-zA-Z0-9\-_]*$z [\000-\037]c@seZdZdZdS) WSGIWarningz: Raised in response to WSGI-spec-related warnings N)__name__ __module__ __qualname____doc__rr(/usr/lib64/python3.6/wsgiref/validate.pyrysrcGs|s t|dS)N)AssertionError)Zcondargsrrr assert_~sr cCs(t|tkr|Stdj|t|dS)Nz!{0} must be of type str (got {1}))typestrr formatrepr)valuetitlerrr check_string_types rcsfdd}|S)a 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). cstt|dkdt| d|\}t|gfdd}t|d|d<t|d|d<||}t|dk oz|dkd t|t|S) NzTwo arguments requiredzNo keyword arguments allowedcstt|dkpt|dkd|ft| d|d}|d}t|dkrV|d}nd}t|t|t||t|jdt|S)NrzInvalid number of arguments: %szNo keyword arguments allowedr)r len check_status check_headerscheck_content_typecheck_exc_infoappend WriteWrapper)r kwstatusheadersexc_info)start_responsestart_response_startedrr start_response_wrappers      z;validator..lint_app..start_response_wrapperz wsgi.inputz wsgi.errorsFz>The application must return an iterator, if only an empty list)r r check_environ InputWrapper ErrorWrappercheck_iteratorIteratorWrapper)r renvironr$iterator) application)r"r#r lint_apps  zvalidator..lint_appr)r,r-r)r,r rs )c@s<eZdZddZddZddZddZd d Zd d Zd S)r&cCs ||_dS)N)input)self wsgi_inputrrr __init__szInputWrapper.__init__cGs0tt|dk|jj|}tt|tk|S)Nr)r rr.readr bytes)r/r vrrr r2s zInputWrapper.readcGs0tt|dk|jj|}tt|tk|S)Nr)r rr.readliner r3)r/r r4rrr r5s zInputWrapper.readlinecGsNtt|dk|jj|}tt|tkx|D]}tt|tkq2W|S)Nr)r rr. readlinesr listr3)r/r lineslinerrr r6s   zInputWrapper.readlinesccs x|j}|sdS|VqWdS)N)r5)r/r9rrr __iter__s zInputWrapper.__iter__cCstdddS)Nrz input.close() must not be called)r )r/rrr closeszInputWrapper.closeN) rrrr1r2r5r6r:r;rrrr r&s r&c@s4eZdZddZddZddZddZd d Zd S) r'cCs ||_dS)N)errors)r/ wsgi_errorsrrr r1szErrorWrapper.__init__cCs tt|tk|jj|dS)N)r r rr<write)r/srrr r>szErrorWrapper.writecCs|jjdS)N)r<flush)r/rrr r@szErrorWrapper.flushcCsx|D]}|j|qWdS)N)r>)r/seqr9rrr writeliness zErrorWrapper.writelinescCstdddS)Nrz!errors.close() must not be called)r )r/rrr r;szErrorWrapper.closeN)rrrr1r>r@rBr;rrrr r's r'c@seZdZddZddZdS)rcCs ||_dS)N)writer)r/Z wsgi_writerrrr r1szWriteWrapper.__init__cCstt|tk|j|dS)N)r r r3rC)r/r?rrr __call__szWriteWrapper.__call__N)rrrr1rDrrrr rsrc@seZdZddZddZdS)PartialIteratorWrappercCs ||_dS)N)r+)r/ wsgi_iteratorrrr r1szPartialIteratorWrapper.__init__cCs t|jdS)N)r)r+)r/rrr r:szPartialIteratorWrapper.__iter__N)rrrr1r:rrrr rEsrEc@s4eZdZddZddZddZddZd d Zd S) r)cCs ||_t||_d|_||_dS)NF)original_iteratoriterr+closedcheck_start_response)r/rFrJrrr r1 s zIteratorWrapper.__init__cCs|S)Nr)r/rrr r:szIteratorWrapper.__iter__cCsTt|j dt|j}t|tk r4tdd|f|jdk rPt|jdd|_|S)NzIterator read after closedFz$Iterator yielded non-bytestring (%r)zjThe application returns and we started iterating over its body, but start_response has not yet been called)r rInextr+r r3rJ)r/r4rrr __next__s   zIteratorWrapper.__next__cCs d|_t|jdr|jjdS)NTr;)rIhasattrrGr;)r/rrr r;s zIteratorWrapper.closecCs"|jstjjdt|jddS)Nz/Iterator garbage collected without being closed)rIsysstderrr>r )r/rrr __del__#s zIteratorWrapper.__del__N)rrrr1r:rLr;rPrrrr r)s  r)c Cstt|tkdt||fx d,D]}t||kd |fq$Wx*d-D]"}t||kd||ddfqFWd|krtjdtxF|jD]:}d|krqtt||tkd|t||||fqWtt|dtkd|dft|dd.kd|dt |dt |d|dd/krrBz.wsgi.errors (%r) doesn't have the attribute %s)r@r>rB)r rM)r=rtrrr roqs  rocCsvt|d}|jddd}tt|dkd|t|}t|dkd|t|dksb|dd krrtjd |tdS) NStatusrrrz)Status codes must be three characters: %rdzStatus code is invalid: %r zjThe status string (%r) should be a three-digit integer followed by a single space and a status explanation)rsplitr rrrrjrkr)rZ status_codeZ status_intrrr rws   rcCstt|tkd|t|fi}x|D]}tt|tkd|t|ftt|dk|\}}t|d}t|d}t|jdkd|d||j<td|kod |kd |ttj|d |t|j d  o|j d  d|t j|r(tdd|t j|j dfq(WdS)Nz%Headers (%r) must be of type list: %rz1Individual headers (%r) must be of type tuple: %rrz Header namez Header valuerzyThe Status header cannot be used; it conflicts with CGI script, and HTTP status is not given through headers (value: %r). :z,Header names may not contain ':' or '\n': %rzBad header name: %r-_z#Names may not end in '-' or '_': %rrz#Bad header value: %r (bad char: %r)) r r r7rmrrlower header_researchendswithbad_header_value_regroup)r Z header_namesitemnamerrrr rs0          rcCs~t|d}t|jddd}d }x@|D]8\}}t|d}|jdkr(||krRdStdd|q(W||krztdd |dS) Nrurr0z Header namez content-typezJContent-Type header found in a %s response, which must not return content.z,No Content-Type header found in headers (%s))rr)rrrryr~r )rr codeZNO_MESSAGE_BODYrrrrr rs    rcCs*t|dkpt|tkd|t|fdS)Nz exc_info (%r) is not a tuple: %r)r r rm)r!rrr rsrcCstt|ttf ddS)NzwYou should not return a string as your application iterator, instead return a single-item list containing a bytestring.)r isinstancerr3)r+rrr r(sr()r__all__rerNrjcompilerrWarningrr rrr&r'rrEr)r%rnrorrrrr(rrrr ns.  7#  #A