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classes/utils for Kerberos principal name validation/manipulation
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split principal to the <principal_name>, <realm> components
:param principal: unicode representation of principal
:param realm: if not None, replace the parsed realm with the specified one
:returns: tuple containing the principal name and realm
realm will be `None` if no realm was found in the input string
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Split principal name (without realm) into the components
NOTE: operates on the following RFC 1510 types:
* NT-PRINCIPAL
* NT-SRV-INST
* NT-SRV-HST
Enterprise principals (NT-ENTERPRISE, see RFC 6806) are also handled
:param principal_name: unicode representation of principal name
:returns: tuple of individual components (i.e. primary name for
NT-PRINCIPAL and NT-ENTERPRISE, primary name and instance for others)
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Container for the principal name and realm according to RFC 1510
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parse individual principal name components from the string
representation of the principal. This is done in three steps:
1.) split the string at the unescaped '@'
2.) unescape any leftover '\@' sequences
3.) split the primary at the unescaped '/'
4.) unescape leftover '\/'
:param principal: unicode representation of the principal name
:param realm: if not None, this realm name will be used instead of the
one parsed from `principal`
:returns: tuple containing the principal name components and realm
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is_enterprise� s zPrincipal.is_enterprisec C s t | j�dkS r/ r0 r* r r r �
is_service� s zPrincipal.is_servicec C s" | j o t| j�dko | jd dkS )Nr r �host)r3 r r r* r r r �is_host� s �zPrincipal.is_hostc C s | j r| jd S td��d S )Nr z<User name is defined only for user and enterprise principals)r1 r r r* r r r �username� s
�zPrincipal.usernamec C s" | j std��| jd �d�d S )Nz*Only enterprise principals have UPN suffixr r, r )r2 r r r r* r r r �
upn_suffix� s zPrincipal.upn_suffixc C s | j s| jstd��| jd S )Nz3hostname is defined for host and service principals���)r5 r3 r r r* r r r �hostname� s
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return the unicode representation of principal
works in reverse of the `from_text` class method
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