newstyle class of course

src/zope/errorview/http.py

@@ -0,0 +1,78 @@
+##############################################################################
+#
+# Copyright (c) 2011 Zope Foundation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+from zope.browser.interfaces import ISystemErrorView
+from zope.interface import implements
+from zope.publisher.interfaces.http import IHTTPException
+
+class SystemErrorViewMixin(object):
+
+    implements(ISystemErrorView)
+
+    def isSystemError(self):
+        return True
+
+class ExceptionViewBase(object):
+
+    implements(IHTTPException)
+
+    def __init__(self, context, request):
+        self.context = context
+        self.request = request
+
+    def update(self):
+        self.request.response.setStatus(500)
+
+    def render(self):
+        return u''
+
+    def __call__(self):
+        self.update()
+        return self.render()
+
+    def __str__(self):
+        return self()
+
+class ExceptionView(ExceptionViewBase, SystemErrorViewMixin):
+    pass
+
+class TraversalExceptionView(ExceptionViewBase):
+
+    def update(self):
+        if self.request.method =='MKCOL' and self.request.getTraversalStack():
+            # MKCOL with non-existing parent.
+            self.request.response.setStatus(409)
+        else:
+            self.request.response.setStatus(404)
+
+class UnauthorizedView(ExceptionViewBase):
+
+    def update(self):
+        self.request.unauthorized('basic realm="Zope"')
+        self.request.response.setStatus(401)
+
+class MethodNotAllowedView(ExceptionViewBase):
+
+    # XXX define an interface for MethodNotAllowedView components.
+
+    def allowed(self):
+        # XXX how to determine the allowed HTTP methods?  XXX we need
+        # a safe way to determine the allow HTTP methods. Or should we
+        # let the application handle it?
+        return []
+
+    def update(self):
+        allow = self.allowed()
+        self.request.response.setStatus(405)
+        self.request.response.setHeader('Allow', ', '.join(allow))