Class: HTML::Pipeline::AbsoluteSourceFilter

Inherits:
Filter
  • Object
show all
Defined in:
lib/html/pipeline_plus/absolute_source_filter.rb

Instance Attribute Summary

Attributes inherited from Filter

#context, #result

Instance Method Summary collapse

Methods inherited from Filter

#base_url, call, #current_user, #doc, #has_ancestor?, #html, #initialize, #needs, #parse_html, #repository, to_document, to_html, #validate

Constructor Details

This class inherits a constructor from HTML::Pipeline::Filter

Instance Method Details

#call ⇒ Object

HTML Filter for replacing relative and root relative image URLs with fully qualified URLs

This is useful if an image is root relative but should really be going through a cdn, or if the content for the page assumes the host is known i.e. scraped webpages and some RSS feeds.

Context options:

:image_base_url - Base URL for image host for root relative src.
:image_subpage_url - For relative src.

This filter does not write additional information to the context. This filter would need to be run before CamoFilter.



19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/html/pipeline_plus/absolute_source_filter.rb', line 19

def call
  doc.search('img').each do |element|
    next if element['src'].nil? || element['src'].empty?
    src = element['src'].strip
    next if src.start_with? 'http'
    base = if src.start_with? '/'
             image_base_url
           else
             image_subpage_url
           end
    element['src'] = URI.join(base, src).to_s
  end
  doc
end

#image_base_url ⇒ Object

Private: the base url you want to use



35
36
37
 
# File 'lib/html/pipeline_plus/absolute_source_filter.rb', line 35

def image_base_url
  context[:image_base_url] || raise("Missing context :image_base_url for #{self.class.name}")
end

#image_subpage_url ⇒ Object

Private: the relative url you want to use



40
41
42
 
# File 'lib/html/pipeline_plus/absolute_source_filter.rb', line 40

def image_subpage_url
  context[:image_subpage_url] || raise("Missing context :image_subpage_url for #{self.class.name}")
end