CalDAV

Pointers

• http://wiki.osafoundation.org/Journal/ApacheCon2005

My notes from ApacheCon 2005

• presentation by Lisa Dusseault, OSAF
• Open Source, Standards-based Calendar Sharing

Cosmo

• OSAF's Calendaring and Sharing Server
• Support Chandler and others
• Calendaring and Sharing
• Easy to install, administer, for just a workgroup
• Free

CMP?

Architecture

• See the slide

Jackrabbit and JCR

• incubator project
• Reference implementation of the JCR - Java Content Repository API
• alternative to database storage
  • less structured, more flexibility, easier to extend

Chandler

• OSAF's Rich Personal Information Management Application
• manage email, events, and tasks in an integrated extensible framework
• Python, wsWidgets, pyLucene
• about to release 0.6 - experimental calendar app at this point

Scooby

• Calendar WebUI front-end for Cosmo
• Using AJAX
• Using CalDAV as if it were a client
• online alternative calendar access

OSAF goal

• easy to share personal information
• Especially calendars, personal or shared
  • email and tasks too - mixed or separate
• Hand control over to users
  • easy to set up
  • standards complaint data import/export
  • user interface - rich clients, easy features
  • availability - web app and sync
• .mac - similar goal (plus backup)

WebDAV

• distributed authoring and versioning
• used for file sharing, content managment, source control (subversion)
• internet-scale heirarchical storage
• rich meta-data for any content type

other specialized services

• images - e.g. flikr
• bookmarks - e.g. delicious
• access for rich apps, thin (web) apps, and hip

calendaring

• CAP - "calendar access protocol" like IMAP
• stalled after 7 years
• start over again with new ideas
• start with HTTP - crucial for good Web app architecture

layers

• http - resources, addresses, download, upload, sync
• webDav - collection model, move, copy, permissions: ACL
• use iCalendar for data format
• top with:
  • calendar collection type
  • query - this week
  • query - when is joe busy

CalDAV

• open and interoperable protocol for calendar access and sharing
• IETF submission
• open mailing list

Calendar Consortium

• http://www.calconnect.org/
• interop testing
• use cases and scenarios
• arm-twisting - participation and implementation

CalDAV implementations

• clients: chandler, sunbird, evolution
• servers: oracle, hula, RPI, cosmo/scooby

protocol architecture

• top - icalender resources
• middle level
  • http methods, headers
  • WebDAV methods, headers, properties
  • CalDAV methods, reports
• bottom - http request model

CalDAV data model

• collection
• resources - individually addressible http urls

special calendar features

• REPORT free-busy time (permissions)
• REPORT events in a time range
  • filter by properties as well as time
  • required to browse instead of download
  • handles recurrences

challenges

• recurrence patterns
  • with exceptions
  • timezones
• permissions
• sharing - cross site authentication

next steps

• Release Chandler, Cosmo, and Scooby
• help welcome
• finish CalDAV - submit to IETF
• revise WebDAV - more solid spec
• HTTP authentication
• Revise iCalendar in CALSIFY WG
• Components for WebApp/JCR integration