Class: WebResourceBundler::Filters::CdnFilter::Filter

Inherits:
BaseFilter
  • Object
show all
Defined in:
lib/web_resource_bundler/filters/cdn_filter.rb

Instance Attribute Summary

Attributes inherited from BaseFilter

#settings

Instance Method Summary collapse

Methods inherited from BaseFilter

#apply, #set_settings

Constructor Details

#initialize(settings, file_manager) ⇒ Filter

Returns a new instance of Filter.



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# File 'lib/web_resource_bundler/filters/cdn_filter.rb', line 3

def initialize(settings, file_manager)
  super(settings, file_manager)
end

Instance Method Details

#apply!(block_data) ⇒ Object 



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# File 'lib/web_resource_bundler/filters/cdn_filter.rb', line 7

def apply!(block_data)
  block_data.styles.each do |file| 
    rewrite_content_urls!(file.path, file.content) unless file.content.empty? 
    file.path = new_filepath(file.path)
  end
  block_data
end

#host_for_image(image_url) ⇒ Object

insures that image linked to one particular host



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# File 'lib/web_resource_bundler/filters/cdn_filter.rb', line 20

def host_for_image(image_url)
  #hosts are different depending on protocol 
  if @settings[:protocol] == 'https' 
    hosts = @settings[:https_hosts]
  else
    hosts = @settings[:http_hosts]
  end
  #getting host based on image url hash
  host_index = image_url.hash % hosts.size
  hosts[host_index]
end

#new_filepath(path) ⇒ Object 



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# File 'lib/web_resource_bundler/filters/cdn_filter.rb', line 15

def new_filepath(path)
  File.join(@settings[:cache_dir], 'cdn_' + File.basename(path))
end

#rewrite_content_urls!(file_path, content) ⇒ Object 



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# File 'lib/web_resource_bundler/filters/cdn_filter.rb', line 32

def rewrite_content_urls!(file_path, content)
  content.gsub!(/url\s*\(['|"]?([^\)'"]+)['|"]?\)/) do |s|
    matched_url = $1
    #we shouldn't change url value for base64 encoded images
    if not (/base64/.match(s) or /mhtml/.match(s)) and matched_url.match(/\.(jpg|gif|png|jpeg|bmp)/)
      #using CssUrlRewriter method to get image url 
      url = WebResourceBundler::CssUrlRewriter.rewrite_relative_path(file_path, matched_url)
      host = host_for_image(url)
      s = "url('#{File.join(host, url)}')"
    else
      s
    end
  end
end