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aÁ Return authentication class based on plugin name
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This function returns the class for the authentication plugin plugin_name.
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The returned class is a subclass of BaseAuthPlugin.
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Args:
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plugin_name (str): Authentication plugin name.
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auth_plugin_class (str): Authentication plugin class name.
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Raises:
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NotSupportedError: When plugin_name is not supported.
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Returns:
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Subclass of `BaseAuthPlugin`.
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