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from ivle.webapp.base.views import BaseView
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from ivle.webapp.errors import BadRequest, MethodNotAllowed, Unauthorized
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from ivle.webapp.errors import BadRequest, MethodNotAllowed
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class RESTView(BaseView):
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content_type = "application/octet-stream"
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def __init__(self, req, *args, **kwargs):
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setattr(self, key, kwargs[key])
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def render(self, req):
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raise NotImplementedError()
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if req.method == 'GET':
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outstr = self.GET(req)
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if req.method == 'PUT':
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outstr = self.PATCH(req, req.read())
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req.content_type = self.content_type
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class JSONRESTView(RESTView):
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lambda self: [m for m in ('GET', 'PUT', 'PATCH')
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if hasattr(self, m)] + ['POST'])
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def authorize(self, req):
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return True # Real authz performed in render().
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def authorize_method(self, req, op):
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if not hasattr(op, '_rest_api_permission'):
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if op._rest_api_permission not in self.get_permissions(req.user):
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def render(self, req):
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if req.method not in self._allowed_methods:
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raise MethodNotAllowed(allowed=self._allowed_methods)
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if req.method == 'GET':
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self.authorize_method(req, self.GET)
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outjson = self.GET(req)
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# Since PATCH isn't yet an official HTTP method, we allow users to
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# turn a PUT into a PATCH by supplying a special header.
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elif req.method == 'PATCH' or (req.method == 'PUT' and
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'X-IVLE-Patch-Semantics' in req.headers_in and
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req.headers_in['X-IVLE-Patch-Semantics'].lower() == 'yes'):
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self.authorize_method(req, self.PATCH)
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input = cjson.decode(req.read())
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except cjson.DecodeError:
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raise BadRequest('Invalid JSON data')
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outjson = self.PATCH(req, input)
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outjson = self.PATCH(req, cjson.decode(req.read()))
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elif req.method == 'PUT':
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self.authorize_method(req, self.PUT)
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input = cjson.decode(req.read())
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except cjson.DecodeError:
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raise BadRequest('Invalid JSON data')
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outjson = self.PUT(req, input)
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outjson = self.PUT(req, cjson.decode(req.read()))
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# POST implies named operation.
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elif req.method == 'POST':
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# TODO: Check Content-Type and implement multipart/form-data.
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not op._rest_api_callable:
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raise BadRequest('Invalid named operation.')
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self.authorize_method(req, op)
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# Find any missing arguments, except for the first two (self, req)
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(args, vaargs, varkw, defaults) = inspect.getargspec(op)
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unspec = set(args) - set(opargs.keys())
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if unspec and not defaults:
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raise BadRequest('Missing arguments: ' + ', '.join(unspec))
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raise BadRequest('Missing arguments: ' + ','.join(unspec))
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unspec = [k for k in unspec if k not in args[-len(defaults):]]
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raise BadRequest('Missing arguments: ' + ', '.join(unspec))
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raise BadRequest('Missing arguments: ' + ','.join(unspec))
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# We have extra arguments if the are no match args in the function
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# signature, AND there is no **.
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raise BadRequest('Extra arguments: ' + ', '.join(extra))
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outjson = op(req, **opargs)
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raise AssertionError('Unknown method somehow got through.')
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req.content_type = self.content_type
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if outjson is not None:
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req.write(cjson.encode(outjson))
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class named_operation(object):
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def named_operation(meth):
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'''Declare a function to be accessible to HTTP users via the REST API.
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def __init__(self, permission):
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self.permission = permission
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def __call__(self, func):
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func._rest_api_callable = True
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func._rest_api_permission = self.permission
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class require_permission(object):
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'''Declare the permission required for use of a method via the REST API.
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def __init__(self, permission):
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self.permission = permission
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def __call__(self, func):
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func._rest_api_permission = self.permission
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meth._rest_api_callable = True