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"""Simple base-classes for extensions and filters.
None of the filter and extension functions are considered 'optional' by the
framework. These base-classes provide simple implementations for the
Initialize and Terminate functions, allowing you to omit them,
It is not necessary to use these base-classes - but if you don't, you
must ensure each of the required methods are implemented.
"""
class SimpleExtension:
"Base class for a simple ISAPI extension"
def __init__(self):
pass
def GetExtensionVersion(self, vi):
"""Called by the ISAPI framework to get the extension version
The default implementation uses the classes docstring to
set the extension description."""
# nod to our reload capability - vi is None when we are reloaded.
if vi is not None:
vi.ExtensionDesc = self.__doc__
def HttpExtensionProc(self, control_block):
"""Called by the ISAPI framework for each extension request.
sub-classes must provide an implementation for this method.
"""
raise NotImplementedError("sub-classes should override HttpExtensionProc")
def TerminateExtension(self, status):
"""Called by the ISAPI framework as the extension terminates."""
pass
class SimpleFilter:
"Base class for a a simple ISAPI filter"
filter_flags = None
def __init__(self):
pass
def GetFilterVersion(self, fv):
"""Called by the ISAPI framework to get the extension version
The default implementation uses the classes docstring to
set the extension description, and uses the classes
filter_flags attribute to set the ISAPI filter flags - you
must specify filter_flags in your class.
"""
if self.filter_flags is None:
raise RuntimeError("You must specify the filter flags")
# nod to our reload capability - fv is None when we are reloaded.
if fv is not None:
fv.Flags = self.filter_flags
fv.FilterDesc = self.__doc__
def HttpFilterProc(self, fc):
"""Called by the ISAPI framework for each filter request.
sub-classes must provide an implementation for this method.
"""
raise NotImplementedError("sub-classes should override HttpExtensionProc")
def TerminateFilter(self, status):
"""Called by the ISAPI framework as the filter terminates."""
pass
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