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Viewing changes to ivle/webapp/base/views.py

Began implementing new dispatch framework (with Will Grant and Nick Chadwick).
Added package: ivle.webapp. This contains 'base', with some base class
    implementations for the new Plugins and Views, and 'admin', with 'user'
    (part of 'userservice') re-implemented for the new framework in a RESTful
    way.
dispatch: Added code to partly handle the new plugin system, then fall back to
    the old one.

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ivle/webapp/base/views.py
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# Author: Matt Giuca, Will Grant
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import cjson
 
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class BaseView(object):
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    """
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    Abstract base class for all view objects.
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    """
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    subpath_allowed = False
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    offsite_posts_allowed = False
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    def __init__(self, req, context, subpath=None):
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        self.req = req
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        self.context = context
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        if self.subpath_allowed:
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            self.subpath = subpath
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    def render(self, req):
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        raise NotImplementedError()
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    def get_permissions(self, user, config):
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        return self.context.get_permissions(user, config)
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    def authorize(self, req):
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        self.perms = self.get_permissions(req.user, req.config)
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        return self.permission is None or self.permission in self.perms
 
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    def __init__(self, req, **kwargs):
 
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        pass
 
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    def render(self, req):
 
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        pass
 
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class RESTView(BaseView):
 
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    """
 
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    A view which provides a RESTful interface. The content type is
 
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    unspecified (see JSONRESTView for a specific content type).
 
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    """
 
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    content_type = "application/octet-stream"
 
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    def __init__(self, req, *args, **kwargs):
 
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        pass
 
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    def render(self, req):
 
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        if req.method == 'GET':
 
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            outstr = self.GET(req)
 
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        # XXX PATCH hack
 
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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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        req.write(outstr)
 
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class JSONRESTView(RESTView):
 
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    """
 
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    A special case of RESTView which deals entirely in JSON.
 
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    """
 
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    content_type = "application/json"
 
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    def render(self, req):
 
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        if req.method == 'GET':
 
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            outjson = self.GET(req)
 
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        # XXX PATCH hack
 
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        if req.method == 'PUT':
 
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            outjson = self.PATCH(req, cjson.decode(req.read()))
 
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        req.content_type = self.content_type
 
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        req.write(cjson.encode(outjson))
 
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        req.write("\n")