o id*@sdZddlZddlZddlZddlZddlZddlZddlZddlZddl m Z e e Z dZdZdZeeeegZeZdZdZd Zd d Zd d ZddZddZddZddZddZddZddZd%ddZ dd Z!d!d"Z"d#d$Z#dS)&z-Helper functions for commonly used utilities.N)urllibWARNING EXCEPTIONIGNOREzFile: {0}: Is a symbolic link.z{0}: Is a directoryz,Cannot access {0}: No such file or directorycsFfdd}ttjr|St\}}}}tt|t|S)aA decorator to declare that only the first N arguments my be positional. This decorator makes it easy to support Python 3 style keyword-only parameters. For example, in Python 3 it is possible to write:: def fn(pos1, *, kwonly1=None, kwonly1=None): ... All named parameters after ``*`` must be a keyword:: fn(10, 'kw1', 'kw2') # Raises exception. fn(10, kwonly1='kw1') # Ok. Example ^^^^^^^ To define a function like above, do:: @positional(1) def fn(pos1, kwonly1=None, kwonly2=None): ... If no default value is provided to a keyword argument, it becomes a required keyword argument:: @positional(0) def fn(required_kw): ... This must be called with the keyword parameter:: fn() # Raises exception. fn(10) # Raises exception. fn(required_kw=10) # Ok. When defining instance or class methods always remember to account for ``self`` and ``cls``:: class MyClass(object): @positional(2) def my_method(self, pos1, kwonly1=None): ... @classmethod @positional(2) def my_method(cls, pos1, kwonly1=None): ... The positional decorator behavior is controlled by ``_helpers.positional_parameters_enforcement``, which may be set to ``POSITIONAL_EXCEPTION``, ``POSITIONAL_WARNING`` or ``POSITIONAL_IGNORE`` to raise an exception, log a warning, or do nothing, respectively, if a declaration is violated. Args: max_positional_arguments: Maximum number of positional arguments. All parameters after the this index must be keyword only. Returns: A decorator that prevents using arguments after max_positional_args from being used as positional parameters. 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Args: url: string, url to add the query parameter to. name: string, query parameter name. value: string, query parameter value. Returns: Updated query parameter. Does not update the url if value is None. N)rI)urlnamer;rrr_add_query_parameters rLcCsXtj|r tt|tj|rtt|tj|s*t t |dSdS)N) ospathislinkIOError_SYM_LINK_MESSAGErisdir_IS_DIR_MESSAGEisfilewarningswarn_MISSING_FILE_MESSAGE)filenamerrr validate_files   rYcCs"|d}|dkr||dSdS)azIdentify and extract PEM keys. Determines whether the given key is in the format of PEM key, and extracts the relevant part of the key if it is. Args: raw_key_input: The contents of a private key file (either PEM or PKCS12). Returns: string, The actual key if the contents are from a PEM file, or else None. s -----BEGIN N)find) raw_key_inputoffsetrrr_parse_pem_keys  r^cCstj|ddS)N),:) separators)jsondumps)datarrr _json_encodesreasciicCs8t|tjr ||n|}t|tjr|Std|)a4Converts a string value to bytes, if necessary. Unfortunately, ``six.b`` is insufficient for this task since in Python2 it does not modify ``unicode`` objects. Args: value: The string/bytes value to be converted. encoding: The encoding to use to convert unicode to bytes. Defaults to "ascii", which will not allow any characters from ordinals larger than 127. Other useful values are "latin-1", which which will only allows byte ordinals (up to 255) and "utf-8", which will encode any unicode that needs to be. Returns: The original value converted to bytes (if unicode) or as passed in if it started out as bytes. Raises: ValueError if the value could not be converted to bytes. z%{0!r} could not be converted to bytes)r#r$ text_typeencode binary_typer6r)r;encodingresultrrr _to_bytess   rlcCs8t|tjr |dn|}t|tjr|Std|)aEConverts bytes to a string value, if necessary. Args: value: The string/bytes value to be converted. Returns: The original value converted to unicode (if bytes) or as passed in if it started out as unicode. Raises: ValueError if the value could not be converted to unicode. utf-8z'{0!r} could not be converted to unicode)r#r$ridecodergr6r)r;rkrrr _from_bytes6s   rocCst|dd}t|dS)Nrm)rj=)rlbase64urlsafe_b64encoderstrip) raw_bytesrrr_urlsafe_b64encodeLs rucCs*t|}|ddt|d}t|S)Nrp)rlr rqurlsafe_b64decode) b64stringpaddedrrr_urlsafe_b64decodeQs rz)rf)$__doc__rqrr&rbloggingrMrUr$ six.movesr getLoggerrrrrPOSITIONAL_IGNORE frozensetPOSITIONAL_SETrrQrSrWr(r0r2r=rIrLrYr^rerlrorurzrrrrsD  c