get preview (of final) version working

This requires a pile of monkeypatching of collective.documentviewer, this is
done and documented in the monkey.py file.

src/pfwbged/tabellio/__init__.py

@@ -7,3 +7,8 @@ _ = MessageFactory('pfwbged.tabellio')
 
 def initialize(context):
     """Initializer called when used as a Zope 2 product."""
+    pass
+
+
+from .monkey import patchDocumentViewer
+patchDocumentViewer()

src/pfwbged/tabellio/documents.py

@@ -1,5 +1,8 @@
 import datetime
+import os
 import psycopg2.extras
+import urllib2
+import urlparse
 
 from Acquisition import aq_chain
 from plone import api
@@ -11,6 +14,7 @@ from AccessControl.Permissions import access_contents_information
 from zope import schema
 from plone.dexterity.content import Container, Item
 from plone.supermodel import model
+from plone.namedfile.file import NamedBlobFile
 
 from collective.dms.basecontent.dmsdocument import IDmsDocument, DmsDocument
 from collective.dms.basecontent.dmsfile import DmsFile
@@ -180,6 +184,54 @@ class IDocument(IDmsDocument):
     noannexe = schema.TextLine(title=_('Appendix Number'), required=False)
 
 
+
+class RemoteFile(NamedBlobFile):
+    _v_filename = None
+
+    def __init__(self, url):
+        self.url = url
+        self._file_data = None
+
+    @property
+    def filename(self):
+        return os.path.basename(urlparse.urlparse(self.url).path)
+
+    @property
+    def contentType(self):
+        return 'application/pdf'
+
+    @property
+    def data(self):
+        if self._file_data:
+            return self._file_data
+        self._file_data = urllib2.urlopen(self.url).read()
+        return self._file_data
+
+    @property
+    def _blob(self):
+        # compatibility with collective.documentviewer
+        from ZODB.blob import Blob
+        blob = Blob()
+        f = blob.open('w')
+        f.write(self.data)
+        f.close()
+        return blob
+
+    def getSize(self):
+        return len(self.data)
+
+
+class TabellioDmsFile(DmsFile):
+
+    @property
+    def file(self):
+        if self.base_id.startswith('pdf-') or self.base_id.startswith('legi-') or \
+                self.base_id.startswith('doc-'):
+            # get it from Tabellio
+            return None
+        return RemoteFile('http://archive.pfwb.be/' + self.base_id)
+
+
 class Document(DmsDocument):
     implements(IDocument)
     _v_portal_type = 'pfwbged.tabellio.document'
@@ -197,7 +249,7 @@ class Document(DmsDocument):
             raise KeyError()
         obj = cls()
         obj.portal_type = cls._v_portal_type
-        obj.id = row.id
+        obj.id = str(row.id)
         obj.title = row.intit
         obj.doctype = typenames.MAPPING.get(row.type, row.type)
         obj.no = row.no
@@ -215,13 +267,15 @@ class Document(DmsDocument):
 
     def __getitem__(self, id):
         if id.startswith('version-'):
-            t = DmsFile()
-            t.id = id.split('-', 1)[1]
-            t.title = t.id
-            t.file = None
-            t.UID = lambda: 'tabellio-' + t.id
+            t = TabellioDmsFile()
+            t.id = str(id)
+            t.base_id = id.split('-', 1)[1]
+            t.title = t.base_id
+            uid = str(''.join(reversed(id)) + '-tabellio')
+            t.UID = lambda: uid
             t.portal_type = 'dmsmainfile'
-            return aq_chain(t.__of__(self))[0]
+            t = aq_chain(t.__of__(self))[0]
+            return t
         return super(Document, self).__getitem__(id)
 
 

src/pfwbged/tabellio/monkey.py

@@ -0,0 +1,55 @@
+from Acquisition import aq_parent
+
+from persistent.dict import PersistentDict
+from DateTime import DateTime
+from zope.annotation.interfaces import IAnnotations
+
+import collective.documentviewer.convert
+import collective.documentviewer.settings
+import collective.documentviewer.views
+from Products.Five.browser.resource import DirectoryResource
+
+import plone.namedfile.utils
+
+from . import documents
+
+# Monkeypatching of various collective.documentviewer parts
+
+class PDFFiles(collective.documentviewer.views.PDFFiles):
+    # don't check permissions for tabellio thumbnails; this would otherwise
+    # require the objects to have a stable UID and to be registered in the
+    # catalog.
+    def publishTraverse(self, request, name):
+        if name.endswith('-noisrev-tabellio'):
+            fi = DirectoryResource.publishTraverse(self, request, name)
+            return fi
+        return super(PDFFiles, self).publishTraverse(request, name)
+
+
+orig_init = collective.documentviewer.settings.Base.__init__
+def base_init(self, context):
+    # for our transient files we cannot store documentviewer information in
+    # the object annotations so we have to create them under varying names
+    # in the DocumentsFolder object.
+    if isinstance(context, documents.TabellioDmsFile):
+        self.context = context
+        tabellio_folder = aq_parent(aq_parent(context))
+        annotations = IAnnotations(tabellio_folder)
+        # store metadata in top tabellio folder
+        self._metadata = annotations.get('collective.documentviewer-%s' % context.id, None)
+        if self._metadata is None:
+            self._metadata = PersistentDict()
+            self._metadata['last_updated'] = DateTime('1901/01/01').ISO8601()
+            self.storage_version = collective.documentviewer.settings.STORAGE_VERSION
+            annotations['collective.documentviewer-%s' % context.id] = self._metadata
+    else:
+        orig_init(self, context)
+
+
+def patchDocumentViewer():
+    collective.documentviewer.views.PDFFiles = PDFFiles
+    collective.documentviewer.settings.Base.__init__ = base_init
+    collective.documentviewer.convert.Converter.isIndexationEnabled = lambda x: True
+
+    # avoid streaming files as the blob hack breaks this
+    plone.namedfile.utils.filestream_iterator = None