Module: Vpim::Agent::Atomize

Defined in:
lib/vpim/agent/atomize.rb

Constant Summary collapse

MIME = 
"application/atom+xml"

Class Method Summary collapse

Class Method Details

.calendar(ical, feeduri, caluri = nil, calname = nil) ⇒ Object

ical, an icalendar, or at least a Repo calendar’s subset of an Icalendar feeduri, the atom xml should know the URI of where the feed is available from. caluri, optionally, the URI of the calendar its converted from.

TODO - and the URI of an alternative/html representation of this feed?



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# File 'lib/vpim/agent/atomize.rb', line 23

def self.calendar(ical, feeduri, caluri = nil, calname = nil)
  mime = MIME

  feeduri = feeduri.to_str
  caluri = caluri
  calname = (calname or caluri or "Unknown").to_str

  f = Atom::Feed.new
  # Mandatory attributes:
  # For ID, we should use http://.../ics/atom?....., or just the URL of the ics?
  #   I think it can be a full URI... or maybe a sha-1 of our full URI?
  # or like gmail, no id for feed,
  #   <id>tag:gmail.google.com,2004:1295062805013769502</id>
  #
  f.id = feeduri
  f.title = calname
  f.updated = Time.now
  f.authors << Atom::Person.new(:name => (caluri or calname))
  f.generator = Atom::Generator.new do |g|
    g.name = Vpim::PRODID
    g.uri = "http://vpim.rubyforge.org"
    g.version = Vpim::VERSION
  end

  f.links << Atom::Link.new do |l|
    l.href = feeduri
    l.type = mime
    l.rel  = :self
  end

  if caluri
    # This is maybe better described as :via, but with :alternate being
    # an html view of this feed.
    #
    # TODO should I change the scheme to be webcal?
    # TODO should I extend URI to support webcal?
    f.links << Atom::Link.new do |l|
      l.href = caluri
      l.type = "text/calendar"
      l.rel  = :alternate
    end
  end

  # .icon = uri to the vAgent icon
  entry_id = 0
  ical.events do |ve|
    # TODO - infinite?
    ve.occurrences do |t|
      f.entries << Atom::Entry.new do |e|
        # iCalendar -> atom
        # -----------------
        # summary -> title
        # description -> text/content
        # uid -> id
        # created -> published?
        # organizer -> author?
        # contact -> author?
        # last-mod -> semantically, this is updated, but atom doesn't
        #   have the notion that an entry has a relationship to a time,
        #   other than the time the entry itself was published, and when
        #   the entry gets updated. We'll abuse updated for the event's time.
        # categories -> where do "tags" go in atom, if anywhere?
        # attachment -> into a link?
        e.title = ve.summary if ve.summary
        e.content = Atom::Content::Text.new(ve.description) if ve.description
        e.updated = t

        # Use "tag:", as defined by RFC4151, and use event UID if possible. Otherwise,
        # construct something. Maybe I should mix something in to make it unique for
        # each time a feed is generated for the calendar?
        entry_id += 1
        tag = ve.uid || "#{entry_id}@#{feeduri}"
        e.id = "tag:vpim.rubyforge.org,2009:#{tag}"
      end
    end
  end
  return f
end