CalDAV

Calendaring Extensions to WebDAV, or CalDAV, is an Internet standard allowing a client to access and manage calendar data along with the ability to schedule meetings with users on the same or on remote servers.[1][2] It lets multiple users in different locations share, search and synchronize calendar data.[3] It extends the WebDAV (HTTP-based protocol for data manipulation) specification and uses the iCalendar format for the calendar data.[2] The access protocol is defined by RFC 4791.[1] Extensions to CalDAV for scheduling are standardized as RFC 6638.[1] The protocol is used by many important open-source applications.[3]

CalDAV
Communication protocol
PurposeAccess remote scheduling information
IntroductionMarch 2007 (2007-03)
Based onWebDAV
OSI layerApplication
Port(s)Any
RFC(s)RFC 4791, 6638

History

The CalDAV specification was first published in 2003 as an Internet Draft submitted to the Internet Engineering Task Force (IETF) by Lisa Dusseault. In March 2007, the CalDAV specification was finished and published by the IETF as RFC 4791, authored by Cyrus Daboo (Apple), Bernard Desruissaux (Oracle), and Lisa Dusseault (CommerceNet). CalDAV is designed for implementation by any collaborative software, client or server, that needs to maintain, access or share collections of events. It is developed as an open standard to foster interoperability between software from different vendors.

Specification

The architecture of CalDAV (partially inherited from the underlying specifications) organizes the data (events, tasks, free-busy info, notes) in directories (collections), where multiple items (resources) reside. The resources and collections can be accessed by one or more users, using standard HTTP and DAV semantics to detect conflicting changes, or to provide locking.

For access control the concept of ACLs are used, so each operation (view, edit, delete etc.) can be denied or granted per user. Therefore, the specification requires that CalDAV servers must support "WebDAV Access Control Protocol" (RFC 3744). The calendar resources must use iCalendar format, which allows the server to understand and process the data. Parsing the iCalendar items is necessary, because the server has to support a number of calendaring-specific operations such as doing free-busy time reports and expansion of recurring events. With this functionality, a user may synchronize their own calendar to a CalDAV server, and share it among multiple devices or with other users. The protocol also supports non-personal calendars, such as calendars for sites or organizations.

Software

Client

The list of CalDAV clients includes:[4]

  • AgenDAV (Open Source multi-language CalDAV WebClient with AJAX interface)
  • Bloben (Open Source self hosted CalDAV web client) [5]
  • iPhone (version 3.0 or version 2.1 with Remote Calendar)
  • CalDavZAP (Web-based HTML5 / JavaScript application, Open Source)[6]
  • CalDAV Tasksync for Android[7]
  • CalDAV-Sync for Android[8]
  • CalendarSync for Android[9]
  • DAVx⁵ (previously called DAVdroid) for Android (Open Source)[10]
  • EVO Collaborator for Outlook add caldav sync capability to Outlook [11]
  • Evolution (Linux, Unix, Windows) [12]
  • eM Client (Windows, macOS)
  • gSyncit[13] (Sync Microsoft Outlook with mobile/tablet device)
  • Horde Groupware[14]
  • iCal4OL (No longer available for new customers)
  • iCal/Calendar.app (Since Mac OS X Leopard !V 10.5)
  • iCal Import/Export CalDAV for Android[15]
  • Mailfence CalDAV client through iCAL/vCAL
  • Sunbird or Thunderbird with the Lightning extension (Linux, Windows, Unix, Mac OS X)
  • OpenSync for Android
  • Outlook CalDav Synchronizer (open source) adds CalDAV support to Microsoft Outlook[16]
  • vdirsyncer synchronizes calendars (and addressbooks) between two storages, e. g. CalDAV (CardDAV) server with a local folder or file.[17]
  • Windows 10, though restricted to certain providers[18]

Server

The list of CalDAV servers includes:[19]

See also

References
  1. "Introduction". Calconnect. Archived from the original on May 4, 2022.
  2. "Glossary of Terms".
  3. "Introduction to CalDAV". Linux.com. February 14, 2006.
  4. "CalDAV Clients (English)". September 18, 2010. Archived from the original on May 23, 2016. Retrieved December 17, 2010.
  5. Bloben
  6. CalDavZAP
  7. TaskSync
  8. CalDAV-Sync
  9. CalendarSync
  10. DAVx⁵
  11. EVO Collaborator for Outlook
  12. "Using a CalDAV calendar". help.gnome.org. Retrieved February 28, 2019.
  13. Fieldston Software
  14. Horde Groupware
  15. iCal Import/Export CalDAV
  16. Outlook CalDav Synchronizer
  17. "vdirsyncer — vdirsyncer 0.18.0 documentation".
  18. "Windows 10 can sync email/contacts/calendars with all major providers – chooses to pick winners and losers in the market instead". Ctrl. March 2, 2017. Retrieved March 2, 2017.
  19. "CalDAV Servers (English)". Retrieved January 7, 2014.
  20. "Documentation of Baïkal". Retrieved May 24, 2022.
  21. "Bedework". Archived from the original on December 2, 2011. Retrieved November 10, 2015.
  22. Bynari Collaboration Suite
  23. DAViCal
  24. DPCalendar
  25. "Daylite CalDAV Server". Archived from the original on October 15, 2015. Retrieved November 10, 2015.
  26. EVO Mail Server
  27. Google Calendar
  28. Kerio Connect
  29. Mailfence
  30. mod_caldav auf SourceForge
  31. Nextcloud
  32. Oracle Communications Calendar Server
  33. ownCloud
  34. Radicale
  35. SOGo
  36. sabre/dav
  37. Scalix
  38. Synovel
  39. Xandikos
  40. Zimbra
  41. sync!Egw
  42. "POPUP".

RFCs
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