Miami, er, Bristol Vice

We've been working on the new Vice syndication project, integrating it into our new Viral Content Manager system. Although the system is still pre-alpha it is very impressive! The basic structure of our content types is:

ContentItems are contained in a folderish portal tool, and contain a reference to 0..* ContentChannels which can be anywhere.

We now have working RSS and ATOM feeds for the ContentItems associated with a given ContentChannel, looking like this:

from zope.interface import implements
from zope.component import adapts, queryMultiAdapter, getMultiAdapter
from zope.interface import Interface
from Products.VCNArchetypes.interfaces import IChannel, IViral
from plone.syndication.outbound.interfaces import IFeed, IFeedItem
import logging


from plone.app.syndication.outbound.adapters.atct import ATFeedBase, ATFeedItemBase

class ContentFeed(ATFeedBase):
"""Adapter from IChannel to IFeed.
>>> from zope.interface.verify import verifyClass
>>> verifyClass(IFeed, ContentFeed)
True
"""

implements(IFeed)
adapts(IChannel, str)

def __iter__(self):
    items = self.context.getContentItems()
    while 1:
        yield queryMultiAdapter((items.next(), self), IFeedItem)


class ViralFeedItem(ATFeedItemBase):
"""Adapter from IViral to IFeedItem.
Make sure that ViralFeedItem implements the IFeedItem
interface
>>> from zope.interface.verify import verifyClass
>>> verifyClass(IFeedItem, ViralFeedItem)
True
"""
implements(IFeedItem)
adapts(IViral, IFeed)

@property
def url(self):
    return self.context.getViral_url()

@property
def body(self):
    return self.context.getViral_description()

and called in with:

<configure
xmlns="http://namespaces.zope.org/zope"
xmlns:zcml="http://namespaces.zope.org/zcml"
xmlns:five="http://namespaces.zope.org/five">

<class class="Products.VCNArchetypes.ContentChannel.ContentChannel">
   <implements interface="plone.syndication.outbound.interfaces.IFeedable" />
</class>

<!-- Adapt IChannel to IFeed -->
<adapter
   factory=".contentfeed.ContentFeed"
   trusted="true" />
<class class=".contentfeed.ContentFeed">
   <require
        permission="plone.syndication.ViewFeeds"
        interface="plone.syndication.outbound.interfaces.IFeed" />
</class>


<!-- Adapt IViral to IFeedItem -->
<adapter
   factory=".contentfeed.ViralFeedItem"
   trusted="true" />
<class class=".contentfeed.ViralFeedItem">
   <require
       permission="plone.syndication.ViewFeeds"
       interface="plone.syndication.outbound.interfaces.IFeedItem" />
</class>

</configure>

One of the sprint tasks is creating an easy to follow, doctested, readme. Until that comes out hopefully this will help people use this brilliant addition to Plone!

Thanks derek_richardson, pbugni and everyone else who's contributed!