Class: Ausca::RSS::Joiner

Inherits:
Object
  • Object
show all
Defined in:
lib/ausca/rss/joiner.rb

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ Joiner

Returns a new instance of Joiner.



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# File 'lib/ausca/rss/joiner.rb', line 27

def initialize(opts)
  options.merge!(opts)
  options[:feeds].to_a unless options[:feeds].is_a? Array 
end

Instance Method Details

#fetch ⇒ Object

Fetch and combine the remote feeds



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# File 'lib/ausca/rss/joiner.rb', line 71

def fetch          
  items = []
  # File.open(options[:feeds], 'r').each_line { |f| }
  options[:feeds].each { |url|
    p "Fetching: #{url}"
    open(url) do |rss|            
      doc = Nokogiri::XML(rss.read) # Nokogiri::XML::ParseOptions::NOCDATA
      doc.xpath('//item').map do |i|
        items << { 
          title: i.xpath('title').text, 
          description: i.xpath('description').text, 
          link: RSS::Util.item_source_url(i),
          image: RSS::Util.item_image_url(i), 
          category: i.xpath('category').text, 
          pubDate: Time.parse(i.xpath('pubDate').text)
        }
      end
    end        
  } 
  items.sort_by { |k| k[:pubDate] }.reverse   
end

#filter(items) ⇒ Object

Filter the output feed items based on optional constraints



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# File 'lib/ausca/rss/joiner.rb', line 94

def filter items
  items = items.first(options[:max_items]) if options[:max_items] > 0
end

#generate ⇒ Object

Generates the output RSS feed



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# File 'lib/ausca/rss/joiner.rb', line 33

def generate    
  items = self.fetch
  items = self.filter items
  
  rss = Nokogiri::XML::Builder.new(encoding: 'UTF-8') do |xml|
    xml.rss(version: options[:version]) do
      xml.channel do
        xml.title options[:title]
        xml.description options[:description]
        xml.link options[:link]
        xml.author options[:author]
                      
        items.each do |source_item|
          xml.item do
            xml.title source_item[:title]
            xml.description do
              xml.cdata source_item[:description] # CGI::unescape_html 
            end
            xml.link source_item[:link]
            xml.category source_item[:category] unless source_item[:category].empty?
            xml.pubDate source_item[:pubDate].httpdate
            
            # optional image
            if source_item[:image]
              xml.image do
                xml.url source_item[:image]
              end
            end
          end
        end
      end
    end
  end
  
  self.save rss.to_xml
end

#options ⇒ Object 



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# File 'lib/ausca/rss/joiner.rb', line 7

def options
  @options ||= {
    # Array of source feed URLs to join
    feeds: [],
    
    # Max output feed items
    max_items: 20,
    
    # Output RSS file path
    output_path: "feed.rss",
    
    # RSS variables
    version: "2.0",
    title: "my title",
    description: "my description",
    link: "my link",
    author: "my author",
  }
end

#save(rss) ⇒ Object 



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# File 'lib/ausca/rss/joiner.rb', line 98

def save rss
  File.write(options[:output_path], rss)
  #File.open(options[:output_path], 'w') { |f| rss }
end