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validate.cpython-38.pyc
U e5d�: � @ s� d Z dgZddlZddlZddlZe�d�Ze�d�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 exactly 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/python3.8/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 td�|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 required� No keyword arguments allowedc s� t t| �dkpt| �dkd| f � t | d� | d }| d }t| �dkrV| d }nd }t|� t|� t||� t|� ��d � t� | � �S )Nr � z Invalid number of arguments: %sr r � )r �len� check_status� check_headers�check_content_type�check_exc_info�append� WriteWrapper)r �kw�status�headers�exc_info�Zstart_responseZstart_response_startedr r �start_response_wrapper� s � z;validator.<locals>.lint_app.<locals>.start_response_wrapper� wsgi.input� 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�� applicationr$ r �lint_app� s �zvalidator.<locals>.lint_appr )r0 r1 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 r )�input)�self� wsgi_inputr r r �__init__� s zInputWrapper.__init__c G s0 t t|�dk� | jj|� }t t|�tk� |S �Nr )r r r2 �readr �bytes�r3 r �vr r r r7 � s zInputWrapper.readc G s0 t t|�dk� | jj|� }t t|�tk� |S r6 )r r r2 �readliner r8 r9 r r r r; � s zInputWrapper.readlinec G sJ t t|�dk� | jj|� }t t|�tk� |D ]}t t|�tk� q0|S r6 )r r r2 � readlinesr �listr8 )r3 r �lines�liner r r r< � s zInputWrapper.readlinesc c s | � � }|sd S |V q d S r )r; )r3 r? r r r �__iter__� s zInputWrapper.__iter__c C s t dd� d S )Nr z input.close() must not be called�r �r3 r r r �close� s zInputWrapper.closeN) r r r r5 r7 r; r< r@ rC 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 r )�errors)r3 � wsgi_errorsr r r r5 � s zErrorWrapper.__init__c C s t t|�tk� | j�|� d S r )r r r rD �write�r3 �sr r r rF � s zErrorWrapper.writec C s | j �� d S r )rD �flushrB r r r rI � s zErrorWrapper.flushc C s |D ]}| � |� qd S r )rF )r3 �seqr? r r r � writelines� s zErrorWrapper.writelinesc C s t dd� d S )Nr z!errors.close() must not be calledrA rB r r r rC � s zErrorWrapper.closeN)r r r r5 rF rI rK rC r r r r r* � s r* c @ s e Zd Zdd� Zdd� ZdS )r c C s || _ d S r )�writer)r3 Z wsgi_writerr r r r5 � s zWriteWrapper.__init__c C s t t|�tk� | �|� d S r )r r r8 rL rG r r r �__call__� s zWriteWrapper.__call__N)r r r r5 rM r r r r r � s r c @ s e Zd Zdd� Zdd� ZdS )�PartialIteratorWrapperc C s || _ d S r �r. )r3 � wsgi_iteratorr r r r5 s z PartialIteratorWrapper.__init__c C s t | jd �S r )r, r. rB r r r r@ s z PartialIteratorWrapper.__iter__N)r r r r5 r@ r r r r rN � s rN 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)r3 rP rT r r r r5 s zIteratorWrapper.__init__c C s | S r r rB 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$Iterator yielded non-bytestring (%r)zjThe application returns and we started iterating over its body, but start_response has not yet been called)r rS �nextr. r r8 rT )r3 r: r r r �__next__ s � �zIteratorWrapper.__next__c C s d| _ t| jd�r | j�� d S )NTrC )rS �hasattrrQ rC rB r r r rC s zIteratorWrapper.closec C s" | j stj�d� t| j d� d S )Nz/Iterator garbage collected without being closed)rS �sys�stderrrF r rB r r r �__del__# s ��zIteratorWrapper.__del__N)r r r r5 r@ rV rC rZ r r r r r, s r, c C s� t t| �tkdt| �| f � dD ]}t || kd|f � q"dD ]"}t || kd||dd � f � q@d| krxt�dt� | �� D ]:}d |kr�q�t t| | �tkd |t| | �| | f � q�t t| d �tkd | d f � t | d dkd| d � t | d � t | d � | d dk�r0t�d| d t� t | � d� �pL| d � d�d| d � t | � d� �pv| d � d�d| d � | � d��r�t t | d �dkd | d � | � d��s�t d| kd � t | � d�dkd � d S ) Nz:Environment is not of the right type: %r (environment: %r)) �REQUEST_METHODZ SERVER_NAMEZ SERVER_PORT� wsgi.versionr& r' zwsgi.multithreadzwsgi.multiprocessz wsgi.run_oncez$Environment missing required key: %r)ZHTTP_CONTENT_TYPEZHTTP_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)r\ z#wsgi.version should be a tuple (%r)zwsgi.url_scheme)ZhttpZhttpszwsgi.url_scheme unknown: %rr& r' r[ )ZGETZHEADZPOSTZOPTIONSZPATCHZPUTZDELETEZTRACEzUnknown 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 '/')r r �dict�warnings�warnr �keysr �tuple� check_input� check_errors�get� startswith�int)r- �keyr r r r( * sx ������ �� � � � � � � ��r( c C s& dD ] }t t| |�d| |f � qd S )N)r7 r; r< r@ z-wsgi.input (%r) doesn't have the attribute %s�r rW )r4 �attrr r r re k s ��re c C s& dD ] }t t| |�d| |f � qd S )N)rI rF rK z.wsgi.errors (%r) doesn't have the attribute %srk )rE rl r r r rf q s ��rf c C sv t | d�} | �d d�d }tt|�dkd| � t|�}t|dkd| � t| �dk sb| d d krrt�d | 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 ri ra rb r )r! Z status_codeZ status_intr r r r w s ���r c C s t t| �tkd| t| �f � | D ]�}t t|�tkd|t|�f � t t|�dk� |\}}t|d�}t|d�}t |�� dkd| � t d|ko�d |kd | � t t�|�d | � t |� d � o�|� d � d| � t �|�r"t dd|t �|�� d�f � q"d S )Nz%Headers (%r) must be of type list: %rz1Individual headers (%r) must be of type tuple: %rr � 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 r= rd r r �lower� header_re�search�endswith�bad_header_value_re�group)r" �item�namer r r r r � s> �� �� ���� �r c C s| t | d�} t| �d d�d �}d}|D ]:\}}t |d�}|�� dkr&||krR d S tdd| � q&||krxtdd| � d S ) Nrm r r )�� i0 rr z content-typezJContent-Type header found in a %s response, which must not return content.z,No Content-Type header found in headers (%s))r ri rq rw 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 rd )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 r8 rO r r r r+ � s �r+ )r �__all__�rerX ra �compilerx r{ �Warningr r r r r) r* r rN r, r( re rf r r r r r+ r r r r �<module> s. j 7# #A
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