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import re |
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from atramhasis.errors import ConceptSchemeNotFoundException |
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""" |
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Thid module is used when blocking operations on a certain Concept or Collection |
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that might be used in external applications. |
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:versionadded: 0.4.0 |
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""" |
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class ProtectedResourceEvent: |
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""" |
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Event triggered when calling a protected operation on a resource |
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""" |
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def __init__(self, uri, request): |
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self.uri = uri |
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self.request = request |
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def protected_operation(fn): |
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""" |
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use this decorator to prevent an operation from being executed |
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when the related resource is still in use |
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""" |
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def advice(parent_object, *args, **kw): |
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request = parent_object.request |
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url = request.path |
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match = re.compile(r'/conceptschemes/(\w+)/c/(\w+)').match(url) |
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scheme_id = match.group(1) |
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c_id = match.group(2) |
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provider = request.skos_registry.get_provider(scheme_id) |
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if not provider: |
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raise ConceptSchemeNotFoundException(scheme_id) |
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uri = provider.uri_generator.generate(id=c_id) |
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event = ProtectedResourceEvent(uri, request) |
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parent_object.request.registry.notify(event) |
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return fn(parent_object, *args, **kw) |
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return advice |
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class ProtectedResourceException(Exception): |
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""" |
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raise this exception when the resource is still used somewhere |
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referenced_in should contain locations where the resource is still referenced |
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""" |
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def __init__(self, value, referenced_in): |
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self.value = value |
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self.referenced_in = referenced_in |
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def __str__(self): |
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return repr(self.value) |
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OnroerendErfgoed /
atramhasis
