Class: UrlExpander::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/url_expander.rb

Class Method Summary collapse

Class Method Details

.expand(url = "", options = {}) ⇒ Object

Expand a given url.

Raises:

  • (ArgumentError) 


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# File 'lib/url_expander.rb', line 11

def self.expand(url="",options = {})
  # Setup the default options
  options[:nested_shortening] = true unless options.has_key?(:nested_shortening)
  if options[:nested_shortening]
    options[:limit] = 10 unless options.has_key?(:limit)
  end
  options[:config_file] = "#{ENV['HOME']}/url_expander_credentials.yml" unless options[:config_file]
  
  # We Reached the maximum number of redirections, quit.
  raise ArgumentError, 'HTTP redirect too deep' if options[:nested_shortening] && options[:limit] == 0
  
  # Make sure we have a url
  raise ArgumentError.new('Expander requires a short url') if url.nil? || url.empty?
  exclude_klasses = ['UrlExpander::Expanders::Basic', 'UrlExpander::Expanders::API', 'UrlExpander::Expanders::Scrape']
  
  # Get the names for all the expanders except the basic default one.
  mod     = UrlExpander::Expanders
  expanders = mod.constants.collect{|c| mod.const_get(c)}.select{|c| c.class == Class && !exclude_klasses.include?(c.to_s)}
  expander_klass = nil
  
  # Find the correct expander
  expanders.each do |exp|
    if exp.respond_to?("is_me?")
      expander_klass = exp if exp.is_me?(url)
    elsif(exp::PATTERN.match(url))
      expander_klass = exp
    end
  end
  @expander = (!expander_klass.nil?) ? expander_klass.new(url,options) : nil
  
  if @expander.nil? && !options[:is_redirection]
    raise ArgumentError.new('Unknow url') 
  end
  
  if options[:nested_shortening] & !@expander.nil?
    options[:limit] -= 1
    options[:is_redirection] = true
    UrlExpander::Client.expand(@expander.long_url, options)
  else
    (@expander.nil?) ? url : @expander.long_url
  end
end