Try to restore broken blobs when exporting content.

CHANGES.rst

@@ -5,6 +5,9 @@ Changelog
 1.11 (unreleased)
 -----------------
 
+- Try to restore broken blobs when exporting content.
+  [thet]
+
 - When exporting into separate JSON files write also the error in a separate errors.json file.
   This fixes an error at the end of the export and no errors being written.
   [thet]

src/collective/exportimport/serializer.py

@@ -109,10 +109,26 @@ def __call__(self):
         if namedfile is None:
             return None
 
-        if "built-in function id" in namedfile.filename:
-            filename = self.context.id
-        else:
-            filename = namedfile.filename
+        try:
+            if "built-in function id" in namedfile.filename:
+                filename = self.context.id
+            else:
+                filename = namedfile.filename
+        except AttributeError:
+            # Try to recover broken namedfile
+            # Related to: WARNING OFS.Uninstalled Could not import class 'NamedBlobFile' from module 'zope.app.file.file'
+            from ZODB.broken import Broken
+            if isinstance(namedfile, Broken):
+                broken_namedfile = namedfile.__Broken_state__
+                file = broken_namedfile["_blob"].open()
+                result = {
+                    "filename": broken_namedfile["filename"],
+                    "content-type": broken_namedfile["contentType"],
+                    "data": base64.b64encode(file.read()),
+                    "encoding": "base64",
+                }
+                file.close()
+                return result
 
         result = {
             "filename": filename,