Do not assume the data to be transformed is an encoded string, it may…

… already be unicode.

collective/embedly/transform.py

@@ -3,6 +3,7 @@
 import re
 import logging
 from Products.CMFCore.utils import getToolByName
+from Products.CMFPlone.utils import safe_unicode
 from Products.PortalTransforms.interfaces import ITransform
 from zope.interface import implements
 from zope.component import getUtility, queryUtility
@@ -241,7 +242,7 @@ def convert(self, data, idata, filename=None, **kwargs):
         if context:
             putils = getToolByName(context, 'plone_utils')
             encoding = putils.getSiteEncoding()
-            data = data.decode(encoding)
+            data = safe_unicode(data, encoding)
             text = parse(data, context.absolute_url())
             text = text.encode(encoding)
         else:

docs/HISTORY.rst

@@ -4,6 +4,9 @@ Changelog
 dev
 ---
 
+- Don't attempt to decode unicode strings in transform.
+  [alecm]
+
 - Add embedly API key to requests in preview mode (this fixes #19)
   [fRiSi]