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validate.cpython-36.pyc
3 \;; � @ s� d Z dgZddlZddlZddlZejd�Zejd�ZG dd� de�Z dd � Z d d � Z d d� Z G d d� d�Z G dd� d�ZG dd� d�ZG dd� d�ZG dd� d�Zdd� Zdd� Zdd � Zd d � Zd d � 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). � validator� Nz^[a-zA-Z][a-zA-Z0-9\-_]*$z [\000-\037]c @ s e Zd ZdZdS )� WSGIWarningz: Raised in response to WSGI-spec-related warnings N)�__name__� __module__� __qualname__�__doc__� r r �(/usr/lib64/python3.6/wsgiref/validate.pyr y s r c G s | s t |� �d S )N)�AssertionError)Zcond�argsr r r �assert_~ s r c C s( t | �tkr| S tdj|t| ����d S )Nz!{0} must be of type str (got {1}))�type�strr �format�repr)�value�titler r r �check_string_type� s r c s � fdd�}|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). c s� t t| �dkd� t | d� | \}� t|� g �� �fdd�}t|d �|d< t|d �|d< �||�}t |d k oz|dkd � t|� t|��S ) N� zTwo arguments requiredz No keyword arguments allowedc s� t t| �dkpt| �dkd| f � t | d� | d }| d }t| �dkrV| d }nd }t|� t|� t||� t|� �jd � t� | � �S )Nr � z Invalid number of arguments: %sz No keyword arguments allowedr � )r �len� check_status� check_headers�check_content_type�check_exc_info�append� WriteWrapper)r �kw�status�headers�exc_info)�start_response�start_response_startedr r �start_response_wrapper� s z;validator.<locals>.lint_app.<locals>.start_response_wrapperz wsgi.inputz wsgi.errorsFz>The application must return an iterator, if only an empty list)r r � check_environ� InputWrapper� ErrorWrapper�check_iterator�IteratorWrapper)r r �environr$ �iterator)� application)r" r# r �lint_app� s zvalidator.<locals>.lint_appr )r, r- r )r, r r � s )c @ s< e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd S )r& c C s || _ d S )N)�input)�self� wsgi_inputr r r �__init__� s zInputWrapper.__init__c G s0 t t|�dk� | jj|� }t t|�tk� |S )Nr )r r r. �readr �bytes)r/ r �vr r r r2 � s zInputWrapper.readc G s0 t t|�dk� | jj|� }t t|�tk� |S )Nr )r r r. �readliner r3 )r/ r r4 r r r r5 � s zInputWrapper.readlinec G sN t t|�dk� | jj|� }t t|�tk� x |D ]}t t|�tk� q2W |S )Nr )r r r. � readlinesr �listr3 )r/ r �lines�liner r r r6 � s zInputWrapper.readlinesc c s x| j � }|sd S |V qW d S )N)r5 )r/ r9 r r r �__iter__� s zInputWrapper.__iter__c C s t dd� d S )Nr z input.close() must not be called)r )r/ r r r �close� s zInputWrapper.closeN) r r r r1 r2 r5 r6 r: r; r r r r r& � s r& c @ s4 e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd S ) r' c C s || _ d S )N)�errors)r/ � wsgi_errorsr r r r1 � s zErrorWrapper.__init__c C s t t|�tk� | jj|� d S )N)r r r r< �write)r/ �sr r r r> � s zErrorWrapper.writec C s | j j� d S )N)r< �flush)r/ r r r r@ � s zErrorWrapper.flushc C s x|D ]}| j |� qW d S )N)r> )r/ �seqr9 r r r � writelines� s zErrorWrapper.writelinesc C s t dd� d S )Nr z!errors.close() must not be called)r )r/ r r r r; � s zErrorWrapper.closeN)r r r r1 r> r@ rB r; r r r r r' � s r' c @ s e Zd Zdd� Zdd� ZdS )r c C s || _ d S )N)�writer)r/ Z wsgi_writerr r r r1 � s zWriteWrapper.__init__c C s t t|�tk� | j|� d S )N)r r r3 rC )r/ r? r r r �__call__� s zWriteWrapper.__call__N)r r r r1 rD r r r r r � s r c @ s e Zd Zdd� Zdd� ZdS )�PartialIteratorWrapperc C s || _ d S )N)r+ )r/ � wsgi_iteratorr r r r1 s z PartialIteratorWrapper.__init__c C s t | jd �S )N)r) r+ )r/ r r r r: s z PartialIteratorWrapper.__iter__N)r r r r1 r: r r r r rE � s rE c @ s4 e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd S ) r) c C s || _ t|�| _d| _|| _d S )NF)�original_iterator�iterr+ �closed�check_start_response)r/ rF rJ r r r r1 s zIteratorWrapper.__init__c C s | S )Nr )r/ r r r r: s zIteratorWrapper.__iter__c C sT t | j d� t| j�}t|�tk r4t dd|f � | jd k rPt | jd� d | _|S )NzIterator read after closedFz$Iterator yielded non-bytestring (%r)zjThe application returns and we started iterating over its body, but start_response has not yet been called)r rI �nextr+ r r3 rJ )r/ r4 r r r �__next__ s zIteratorWrapper.__next__c C s d| _ t| jd�r | jj� d S )NTr; )rI �hasattrrG r; )r/ r r r r; s zIteratorWrapper.closec C s" | j stjjd� t| j d� d S )Nz/Iterator garbage collected without being closed)rI �sys�stderrr> r )r/ r r r �__del__# s zIteratorWrapper.__del__N)r r r r1 r: rL r; rP r r r r r) s r) c C s� t t| �tkdt| �| f � x d,D ]}t || kd |f � q$W x*d-D ]"}t || kd||dd � f � qFW d| kr�tjdt� xF| j� D ]:}d|kr�q�t t| | �tkd|t| | �| | f � q�W t t| d �tkd| d f � t | d d.kd| d � t | d � t | d � | d d/k�r<tjd!| d t� t | j d"� �pX| d" j d#�d$| d" � t | j d%� �p�| d% j d#�d&| d% � | j d'��r�t t | d' �d(kd)| d' � | j d"��s�t d%| kd*� t | j d"�d#kd+� d S )0Nz:Environment is not of the right type: %r (environment: %r)�REQUEST_METHOD� SERVER_NAME� SERVER_PORT� wsgi.version� wsgi.input� wsgi.errors�wsgi.multithread�wsgi.multiprocess� wsgi.run_oncez$Environment missing required key: %r�HTTP_CONTENT_TYPE�HTTP_CONTENT_LENGTHz8Environment should not have the key: %s (use %s instead)� 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 likely�.z9Environmental variable %s is not a string: %r (value: %r)z#wsgi.version should be a tuple (%r)zwsgi.url_scheme�http�httpszwsgi.url_scheme unknown: %r�GET�HEAD�POST�OPTIONS�PATCH�PUT�DELETE�TRACEzUnknown REQUEST_METHOD: %rZ SCRIPT_NAME�/z$SCRIPT_NAME doesn't start with /: %rZ PATH_INFOz"PATH_INFO doesn't start with /: %rZCONTENT_LENGTHr zInvalid CONTENT_LENGTH: %rzgOne of SCRIPT_NAME or PATH_INFO are required (PATH_INFO should at least be '/' if SCRIPT_NAME is empty)zOSCRIPT_NAME cannot be '/'; it should instead be '', and PATH_INFO should be '/') rQ rR rS rT rU rV rW rX rY )rZ r[ )r^ r_ )r` ra rb rc rd re rf rg )r r �dict�warnings�warnr �keysr �tuple� check_input� check_errors�get� startswith�int)r* �keyr r r r% * s` r% c C s* x$dD ] }t t| |�d| |f � qW d S )Nr2 r5 r6 r: z-wsgi.input (%r) doesn't have the attribute %s)r2 r5 r6 r: )r rM )r0 �attrr r r rn k s rn c C s* x$dD ] }t t| |�d| |f � qW d S )Nr@ r> rB z.wsgi.errors (%r) doesn't have the attribute %s)r@ r> rB )r rM )r= rt r r r ro q s ro c C sv t | d�} | jd d�d }tt|�dkd| � t|�}t|dkd| � t| �dk sb| d d krrtjd | t� d S ) N�Statusr r r z)Status codes must be three characters: %r�d zStatus code is invalid: %r� � zjThe status string (%r) should be a three-digit integer followed by a single space and a status explanation)r �splitr r rr rj rk r )r Z status_codeZ status_intr r r r w s r c C s t t| �tkd| t| �f � i }x�| D ]�}t t|�tkd|t|�f � t t|�dk� |\}}t|d�}t|d�}t |j� dkd| � d ||j� < t d|ko�d |kd | � t tj|�d | � t |j d � o�|j d � d| � t j|�r(t dd|t j|�j d�f � q(W d S )Nz%Headers (%r) must be of type list: %rz1Individual headers (%r) must be of type tuple: %rr z Header namez Header valuer zyThe 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 '_': %rr z#Bad header value: %r (bad char: %r)) r r r7 rm r r �lower� header_re�search�endswith�bad_header_value_re�group)r Z header_names�item�namer r r r r � s0 r c C s~ t | d�} t| jd d�d �}d }x@|D ]8\}}t |d�}|j� dkr(||krRd S tdd| � q(W ||krztdd | � d S ) Nru r r �� �0 z 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))r� r� )r rr ry r~ r )r r �codeZNO_MESSAGE_BODYr� r r r r r � s r c C s* t | d kpt| �tkd| t| �f � d S )Nz exc_info (%r) is not a tuple: %r)r r rm )r! r r r r � s r c C s t t| ttf� d� d S )NzwYou should not return a string as your application iterator, instead return a single-item list containing a bytestring.)r � isinstancer r3 )r+ r r r r( � s r( )r �__all__�rerN rj �compiler r� �Warningr r r r r& r' r rE r) r% rn ro r r r r r( r r r r �<module>n s. 7# #A
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