Plone Image Proxy View

imageproxyview.py

# -*- coding: utf-8 -*-
from plone import api
from plone.namedfile.interfaces import IStableImageScale
from plone.namedfile.scaling import ImageScale
from plone.scale.storage import AnnotationStorage
from Products.Five import BrowserView
from zExceptions import NotFound
from zope.interface import alsoProvides
from zope.interface import implementer
from zope.publisher.interfaces import IPublishTraverse

import re

RE = re.compile('.*/@@images/(.*?)"')


@implementer(IPublishTraverse)
class ImageProxyView(BrowserView):

   def __call__(self):
       if len(self.subpath) > 1:
           field = self.subpath[1]
           if '-' in field: #we got UID
               if '.' in field:
                   field, ext = field.rsplit('.', 1)
               imgUid = self.subpath[0]
               img = api.content.get(UID=imgUid)
               storage = AnnotationStorage(img)
               info = storage.get(field)
               if info is not None:
                   scale_view = ImageScale(img, self.request, **info)
                   alsoProvides(scale_view, IStableImageScale)
                   return scale_view.__of__(self.context).index_html()
               return NotFound('UID invalid')

       else:
           field = None

       if len(self.subpath) > 2:
           scale = self.subpath[2]
       else:
           scale = None

       return self.image_util.scale(fieldname=field, scale= scale).index_html()

   def publishTraverse(self, request, name):
       if not hasattr(self, 'subpath'):
           self.subpath = []
       self.subpath.append(name)
       return self

   @property
   def image_util(self):
       if len(self.subpath) < 1:
           raise(ValueError)

       imgUid = self.subpath[0]
       img = api.content.get(UID=imgUid)
       return api.content.get_view(context=img, request=self.request, name='images')


   def tag(self,
           fieldname=None,
           scale=None,
           height=None,
           width=None,
           direction='thumbnail',
           uid=None,
           **kwargs):
       img = api.content.get(UID=uid)
       imgutil = api.content.get_view(context=img, request=self.request, name='images')
       tag = imgutil.tag(fieldname=fieldname, scale=scale,height=height,width=width,direction=direction,**kwargs)
       #import pdb; pdb.set_trace()
       match = RE.match(tag)
       return self.context.absolute_url() + '/@@imageproxy/' + uid + '/' + match.group(1)