[Tickets #12782] vCard export via CardDAV interface contains properties with empty values violating the spec

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Ticket URL: http://bugs.horde.org/ticket/12782
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  Ticket             | 12782
  Created By         | ralf at kruedewagen.de
  Summary            | vCard export via CardDAV interface contains properties
                     | with empty values violating the spec
  Queue              | Turba
  Version            | 4.1.2
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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ralf at kruedewagen.de (2013-10-22 13:32) wrote:

When sending contact data to a CardDAV client, Horde 5 creates files like:

####################
BEGIN:VCARD
VERSION:3.0
UID:20131018104100.uYYOysmgwqS6tRPiYvf9wA1 at domain.de
NICKNAME:
X-EPOCSECONDNAME:
BDAY:
X-ANNIVERSARY:
X-SPOUSE:
PHOTO:
TZ;VALUE=text:
EMAIL;TYPE=INTERNET:
TEL;TYPE=HOME,VOICE:
TEL;TYPE=FAX,HOME:
TEL;TYPE=WORK,VOICE:
TEL;TYPE=CELL,VOICE:
TEL;TYPE=FAX:
TEL;TYPE=PAGER:
TITLE:
ROLE:
LOGO:
CATEGORIES:Business
NOTE:Eine Notiz
URL:
X-WV-ID:
N:ABC AG;;;;
FN:ABC AG
ORG:ABC AG;
ADR;TYPE=HOME:;;;;;;
ADR;TYPE=WORK:;;;;;;
END:VCARD
####################

There are many properties like BDAY (birthday) which have no value  
assigned. This confuses some CardDAV sync clients like the well known  
CardDAV-Sync app http://dmfs.org/carddav/. This sync clients sets  
"01.01.1970" as birthday, which results in getting many wrong calendar  
entries on Jan 1st.

According to discussions with the app developer and my own research on  
common vCard file style, fields like "BDAY" must have a proper  
property value assigned if they are given at all. The ABNF does  
explicitly say that the value must be "date-value" or  
"date-time-value" (not optional, i.e. not empty).

See specs:
http://tools.ietf.org/html/rfc2426#page-31
http://tools.ietf.org/html/rfc6350

Remark: Manual vCard exports of the address book do not contain those  
properties with empty values. So, this is probably just related to the  
CardDAV interface.

So, please just export properties which have a value (like the regular  
address book export already does).