BibDocFile: addition of files redirect

* Adds redirection on files that their record has been merged.

Signed-off-by: Harris Tzovanakis <me@drjova.com>

Author: drjova

modules/bibdocfile/lib/bibdocfile_webinterface.py

@@ -1,5 +1,5 @@
 # This file is part of Invenio.
-# Copyright (C) 2012, 2013 CERN.
+# Copyright (C) 2012, 2013, 2015, 2016 CERN.
 #
 # Invenio is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
@@ -46,10 +46,16 @@
 from invenio.webinterface_handler import wash_urlargd, WebInterfaceDirectory
 from invenio.urlutils import make_canonical_urlargd, redirect_to_url
 from invenio.messages import gettext_set_language
-from invenio.search_engine import \
-     guess_primary_collection_of_a_record, get_colID, record_exists, \
-     create_navtrail_links, check_user_can_view_record, record_empty, \
-     is_user_owner_of_record
+from invenio.search_engine import (
+     check_user_can_view_record,
+     create_navtrail_links,
+     get_colID,
+     get_merged_recid,
+     guess_primary_collection_of_a_record,
+     is_user_owner_of_record,
+     record_empty,
+     record_exists
+)
 from invenio.bibdocfile import BibRecDocs, normalize_format, file_strip_ext, \
     stream_restricted_icon, BibDoc, InvenioBibDocFileError, \
     get_subformat_from_format
@@ -105,6 +111,21 @@ def getfile(req, form):
                                            navmenuid='submit')
 
             if record_exists(self.recid) < 1:
+                # Check if the record of the file has been merged
+                # if the /record/1 has been merged to /record/2 then
+                # /record/1/files/foo.pdf will redirect to /record/2/files/foo.pdf
+                merged_recid = get_merged_recid(self.recid)
+                if merged_recid:
+                    # Build the url for the file in merged record
+                    url = "{0}/{1}/{2}/files/{3}".format(
+                        CFG_SITE_URL,
+                        CFG_SITE_RECORD,
+                        merged_recid,
+                        filename
+                    )
+                    return redirect_to_url(
+                        req, url, redirection_type=apache.HTTP_MOVED_PERMANENTLY
+                    )
                 msg = "<p>%s</p>" % _("Requested record does not seem to exist.")
                 return warning_page(msg, req, ln)