Class: Calendar

Inherits:
DynamicContent
  • Object
show all
Defined in:
app/models/calendar.rb

Defined Under Namespace

Classes: CalendarResults

Constant Summary collapse

DISPLAY_FORMATS = 
{ 
  "List (Multiple)" => "headlines", 
  "Detailed (Single)" => "detailed" 
}
CALENDAR_SOURCES =

exclude RSS and ATOM since cant get individual fields

{ # exclude RSS and ATOM since cant get individual fields
  "Google" => "google", 
  "iCal" => "ical", 
#    "Bedework JSON" => "bedeworkjson" 
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.form_attributes ⇒ Object

calendar api parameters and preferred view (output_format)



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# File 'app/models/calendar.rb', line 221

def self.form_attributes
  attributes = super()
  attributes.concat([:config => [
    :calendar_source, # google or ical (or bedework JSON eventually)
    :api_key,         # google
    :calendar_id,     # google
    :calendar_url,    # iCal url (specify parms in url manually)
    :max_results,
    :days_ahead,
    :start_date,
    :end_date,
    :output_format,   # all cals
    :day_format,      # all cals
    :time_format      # all cals
  ]])
end

Instance Method Details

#build_content ⇒ Object 



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# File 'app/models/calendar.rb', line 55

def build_content
  contents = []
  result = fetch_calendar

  if result.error?
    raise result.error_message
  else
    day_format = self.config['day_format']
    time_format = self.config['time_format']

    case self.config['output_format']
    when 'headlines' # 5 items per entry, titles only
      result.items.each_slice(5).with_index do |items, index|
        htmltext = HtmlText.new()
        htmltext.name = "#{result.name} (#{index+1})"
        htmltext.data = "<h1>#{result.name}</h1>#{items_to_html(items, day_format, time_format)}"
        contents << htmltext
      end
    when 'detailed' # each item is a separate entry, title and description
      result.items.each_with_index do |item, index|
        htmltext = HtmlText.new()
        htmltext.name = "#{result.name} (#{index+1})"
        htmltext.data = item_to_html(item, day_format, time_format)
        contents << htmltext
      end
    else
      raise ArgumentError, 'Unexpected output format for Calendar feed.'
    end
  end

  return contents
end

#fetch_calendar ⇒ Object 



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# File 'app/models/calendar.rb', line 88

def fetch_calendar
  result = CalendarResults.new
  client_key = self.config['api_key']
  calendar_id = self.config['calendar_id']
  calendar_source = self.config['calendar_source']
  start_date = self.config['start_date'].strip.empty? ? Clock.time.beginning_of_day.iso8601 : self.config['start_date'].to_time.beginning_of_day.iso8601
  # end_date is not used by the google api, as the resulting behavior is unexpected
  end_date = self.config['end_date'].strip.empty? ? (start_date.to_time.beginning_of_day + self.config['days_ahead'].to_i.days).end_of_day.iso8601 : self.config['end_date'].to_time.beginning_of_day.iso8601

  case calendar_source
  when 'google'
    if !client_key.empty?
      # ---------------------------------- google calendar api v3 via client api
	require 'google/apis/calendar_v3'

	client = Google::Apis::CalendarV3::CalendarService.new
      client.key = client_key
      
      begin
         tmp = client.list_events(calendar_id,
                               max_results: self.config['max_results'],
                               single_events: true,
                               order_by: 'startTime',
                               time_min: start_date)

      # convert to common data structure
      #result.error_message = tmp.error_message if tmp.error?
      rescue => e
         result.error_message = e.message
      end
      if !result.error?
        result.name = tmp.summary
        tmp.items.each do |item|
          # All-day events aren't parsed as DateTime. Make it so.
          starttime = item.start.date_time || Date.parse(item.start.date)
          endtime = item.end.date_time || Date.parse(item.end.date)
          result.add_item(item.summary, item.description, item.location, starttime, endtime)
        end
      end
    end
  when 'ical'
      # ---------------------------------- iCal calendar 
      # need to filter manually below because the url may not accommodate filtering
      # so respect self.config[max_results] and start_date and end_date (which incorporates the days ahead)
      require 'open-uri'
      require 'icalendar'

      begin
        url = self.config['calendar_url']
        calendars = nil
        open(URI.parse(url)) do |cal|
          calendars = Icalendar.parse(cal)
        end

        max_results = self.config['max_results'].to_i
        result.name =  self.name    # iCal doesn't provide a calendar name, so use the user's provided name
        calendars.first.events.each do |item|
          title = item.summary
          description = item.description
          location = item.location
          # behave a little differently depending on whether or not our iCal has a timezone defined
          # this behavior is somewhat lazy/sloppy in that we're assuming the existence of a defined timezone means
          # that times are local ('correct'), whereas the absence of a timezone means the data is
          # likely in UTC/Zulu time
          if calendars.first.has_timezone?
            item_start_time = item.dtstart.to_datetime unless item.dtstart.nil?
            item_end_time = item.dtend.to_datetime unless item.dtend.nil?
          else
            item_start_time = Time.zone.parse(item.dtstart.to_s).to_datetime unless item.dtstart.nil?
            item_end_time = Time.zone.parse(item.dtend.to_s).to_datetime unless item.dtend.nil?
          end
          item_end_time = nil if item_end_time == item_start_time
          # make sure the item's start date is within the specified range
          if item_start_time >= start_date && item_start_time < end_date
            result.add_item(title, description, location, item_start_time, item_end_time)
          end

        end
        result.items.sort! { |a, b| a.start_time <=> b.start_time }
        result.items = result.items[0..(max_results -1)]
      rescue => e
        result.error_message = e.message
      end
  else
    result.error_message = "unsupported calendar source #{calendar_source}"
  end

  return result
end

#item_to_html(item, day_format, time_format) ⇒ Object 



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# File 'app/models/calendar.rb', line 178

def item_to_html(item, day_format, time_format)
  start_time = item.start_time.strftime(time_format)
  end_time = item.end_time.strftime(time_format) unless item.end_time.nil?

  html = []
  html << "<h1>#{item.name}</h1>"
  html << "<h2>#{item.start_time.strftime(day_format)}</h2>" 
  html << (end_time.nil? || start_time == end_time ? "<div class=\"cal-time\">#{start_time}</div>" : "<div class=\"cal-time\">#{start_time} - #{end_time}</div>")
  html << "<div class=\"cal-location\">#{item.location}</div>"
  html << "<p>#{item.description}</p>"
  return html.join("")
end

#items_to_html(items, day_format, time_format) ⇒ Object

display date (only when it changes) / times with title…



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# File 'app/models/calendar.rb', line 192

def items_to_html(items, day_format, time_format)
  html = []
  last_date = nil
  items.each do |item|
    # see if we need a date header
    if last_date != item.start_time.to_date
      if last_date.nil?
        # dont need to close list
      else
        html << "</dl>"
      end
      html << "<h2>#{item.start_time.strftime(day_format)}</h2>"
      html << "<dl>"
    end
    # todo: end time should include date if different
    start_time = item.start_time.strftime(time_format)
    end_time = item.end_time.strftime(time_format) unless item.end_time.nil?

    html << (end_time.nil? || start_time == end_time ? "<dt>#{start_time}</dt>" : "<dt>#{start_time} - #{end_time}</dt>")
    # if the item we're evaluating isn't a DateTime, it's a full-day event
    html << (item.start_time.is_a?(DateTime) ? "" : "<dt>Time N/A</dt>")
    html << "<dd>#{item.name}</dd>"
    last_date = item.start_time.to_date
  end
  html << "</dl>" if !last_date.nil?
  return html.join("")
end

#set_defaults ⇒ Object 



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# File 'app/models/calendar.rb', line 47

def set_defaults
  self.config['calendar_source'] ||= 'ical'
  self.config['day_format'] ||= '%A %b %e'
  self.config['time_format'] ||= '%l:%M %P'
  self.config['max_results'] ||= 10
  self.config['days_ahead'] ||= 7
end

#validate_config ⇒ Object 



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# File 'app/models/calendar.rb', line 238

def validate_config
  # if self.config['api_key'].blank?
  #   errors.add(:config_api_key, "can't be blank")
  # end

  prerequisites_met = true
  if self.config['calendar_id'].blank? && self.config['calendar_source'] == "google"
    errors.add(:config_calendar_id, "can't be blank")
    prerequisites_met = false
  end
  if self.config['calendar_url'].blank? && self.config['calendar_source'] != "google"
    errors.add(:config_calendar_url, "can't be blank")
    prerequisites_met = false
  end
  if self.config['max_results'].blank? 
    errors.add(:config_max_results, "can't be blank")
  end
  # if self.config['days_ahead'].blank?  && self.config['end_date'].blank? 
  #   errors.add(:config_days_ahead, "days ahead or end_date must be specified")
  # end
  if !self.config['start_date'].blank? && !self.config['end_date'].blank?
    start_date = self.config['start_date'].to_date
    end_date = self.config['end_date'].to_date
    if start_date > end_date
      errors.add(:config_start_date, "must precede end date")
    end
  end
  if !CALENDAR_SOURCES.values.include?(self.config['calendar_source'])
    errors.add(:config_calendar_source, "must be #{CALENDAR_SOURCES.keys.join(' or ')}")
  end
  if !DISPLAY_FORMATS.values.include?(self.config['output_format'])
    errors.add(:config_output_format, "must be #{DISPLAY_FORMATS.keys.join(' or ')}")
  end
  # todo: validate strftime components in day_format and time_format?

  begin
    validate_request #if !self.config['api_key'].blank?
  rescue => e
    errors.add(:base, "Could not fetch calendar - #{e.message}")
  end if prerequisites_met
end

#validate_request ⇒ Object

make sure the request is valid by fetching a result back



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# File 'app/models/calendar.rb', line 281

def validate_request
  result = fetch_calendar

  if result.error?
    raise result.error_message
  end
end