Class: KayakFares

Inherits:
Object
  • Object
show all
Defined in:
lib/kayakfares.rb,
lib/kayakfares/version.rb

Overview

KayakFares takes a hash of parameters, from/to/depart/return and then uses the Kayak search API (www.kayak.com/s/search/air) and Mechanize to scrape the results and give you an easy to use array of hashes with the flight prices and details.

Constant Summary collapse

VERSION = 
"0.0.1"

Instance Method Summary collapse

Constructor Details

#initialize(params) ⇒ KayakFares

Creates a new instance of KayakFares.

params - Hash with from/to/depart/return, accepts airport code for

from/to and YYYY/MM/DD or MM/DD/YYYY for depart/return

Returns instance of KayakFares



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# File 'lib/kayakfares.rb', line 16

def initialize(params)
  @params = params
  @mechanize = Mechanize.new {|a| a.user_agent_alias = 'Mac Safari' }
  @base_url = "http://www.kayak.com"
end

Instance Method Details

#compiled_params ⇒ Object

Takes parameters and compiles them into a URL encoded string.

Returns a string



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# File 'lib/kayakfares.rb', line 25

def compiled_params
  params_array = []
  params_array << "l1=#{escape(@params[:from])}"   if @params[:from]
  params_array << "l2=#{escape(@params[:to])}"     if @params[:to]
  params_array << "d1=#{escape(@params[:depart])}" if @params[:depart]
  params_array << "d2=#{escape(@params[:return])}" if @params[:return]
  params_array.join('&')
end

#escape(value) ⇒ Object

URL encodes string.

value - any string

Returns a string



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# File 'lib/kayakfares.rb', line 60

def escape(value)
  URI.escape(value, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]"))
end

#extract_rows ⇒ Object

Extracts the search result nodes from the search results page.

Returns an instance of Nokogiri::XML::NodeSet which behaves like an Array



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# File 'lib/kayakfares.rb', line 51

def extract_rows
  @rows ||= load_page.search("//div[contains(concat(' ',normalize-space(@class),' '),' flightresult ')]")
end

#load_page ⇒ Object

Loads search results page using Mechanize.

Returns an instance of Mechanize::Page



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# File 'lib/kayakfares.rb', line 44

def load_page
  @page ||= @mechanize.get(url)
end

#results ⇒ Object

Compiles and returns an array of hashes with flight details.

Returns an Array



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# File 'lib/kayakfares.rb', line 67

def results
  extract_rows.map do |result|
    hash = {}
    hash[:price] = result.xpath(".//a[contains(concat(' ',normalize-space(@class),' '),' results_price ')]").text.strip
    hash[:airline] = result.xpath(".//div[contains(concat(' ',normalize-space(@class),' '),' rsAirlineName ')]").text.strip
    legs = result.xpath(".//div[@class='singleleg']")
    hash[:leg0_departure_time] = legs[0].xpath(".//div[@class='flighttime']")[0].text.strip
    hash[:leg0_arrival_time] = legs[0].xpath(".//div[@class='flighttime']")[1].text.strip
    hash[:leg0_duration] = legs[0].xpath(".//div[@class='duration']")[0].text.strip
    hash[:leg1_departure_time] = legs[1].xpath(".//div[@class='flighttime']")[0].text.strip
    hash[:leg1_arrival_time] = legs[1].xpath(".//div[@class='flighttime']")[1].text.strip
    hash[:leg1_duration] = legs[1].xpath(".//div[@class='duration']")[0].text.strip
    hash[:booking_url] = @base_url + result.xpath(".//a[@class='dealsinresult']")[0].attributes['rel'].value
    hash
  end
end

#url ⇒ Object

Takes the compiled params and Kayak search url and mashes them together.

Returns a string



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# File 'lib/kayakfares.rb', line 37

def url
  "#{@base_url}/s/search/air?#{compiled_params}"
end