work in progress: Resource-oriented Architecture with Zope 2: handle GET and PUT via methods of a view

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@3527 fd906abe-77d9-0310-91a1-e0d9ade77398

roa/json.py

@@ -32,9 +32,18 @@ class JSONView(object):
         self.request = request
 
     def __call__(self):
+        return self.context.__name__
         return json.dumps(self.context.__dict__.keys())
 
-    def traverse(self, name):
+    def create(self, name):
-        # To be implemented by subclass
+        print '*** create (PUT)', self.context, name
-        print '*** traversing', self.context, name
+        return self.context
+
+    def put(self):
+        print '*** PUT', self.context
+        return self.context
+
+    def get(self):
+        print '*** GET', self.context
+        self.request.response.write('hello')
         return self.context

roa/traversal.py

@@ -29,25 +29,37 @@ from zope import component
 jsonMimeTypes = ('application/json',)
 
 
+def isJSONRequest(request):
+    return request.get('CONTENT_TYPE') in jsonMimeTypes
+
+
 class CheckJSONTraverser(ItemTraverser):
 
     def publishTraverse(self, request, name):
-        if self.isJSONRequest(request):
+        if isJSONRequest(request):
             return self.jsonTraverse(request, name)
         return self.defaultTraverse(request, name)
 
-    def isJSONRequest(self, request):
-        return request.get('CONTENT_TYPE') in jsonMimeTypes
-
     def jsonTraverse(self, request, name):
+        print '*** jsonTraverse', self.context, name
+        if request['TraversalRequestNameStack']:
+            return self.defaultTraverse(request, name)
+        method = self.request['REQUEST_METHOD']
+        print '*** traversing', self.context, name, method
         item = self.context.get(name)
-        if item is not None:
+        if item is None:
-            return item
-        # TODO: specify provides=IJSONView
             view = component.getMultiAdapter((self.context, request), name='json')
             if view is None:
                 return self.defaultTraverse(request, name)
-        return view.traverse(name)
+            if method == 'PUT':
+                return view.create(name)
+            return self.defaultTraverse(request, name)
+        view = component.getMultiAdapter((item, request), name='json')
+        if view is None:
+            return self.defaultTraverse(request, name)
+        if method == 'PUT':
+            return view.put()
+        return view.get()
 
     def defaultTraverse(self, request, name):
         return super(CheckJSONTraverser, self).publishTraverse(request, name)

roa/z2/traversal.py

@@ -22,7 +22,10 @@ $Id$
 """
 
 from ZPublisher.BaseRequest import DefaultPublishTraverse
+from ZPublisher.HTTPRequest import HTTPRequest
+
 from cybertools.roa.traversal import CheckJSONTraverser as BaseTraverser
+from cybertools.roa.traversal import isJSONRequest
 
 
 class CheckJSONTraverser(BaseTraverser, DefaultPublishTraverse):
@@ -30,6 +33,18 @@ class CheckJSONTraverser(BaseTraverser, DefaultPublishTraverse):
     defaultTraverse = DefaultPublishTraverse.publishTraverse
 
     def browserDefault(self, request):
-        if self.isJSONRequest(request):
+        if isJSONRequest(request):
             return self.context, ('@@json',)
         return DefaultPublishTraverse.browserDefault(self, request)
+
+
+old_traverse = HTTPRequest.traverse
+
+def traverse(self, *args, **kw):
+    if isJSONRequest(self):
+        self.maybe_webdav_client = 0
+    old_traverse(self, *args, **kw)
+
+HTTPRequest.traverse = traverse
+
+print '***** HTTPRequest.traverse monkey patch installed.'