Class: DocumentToRichHtml::HtmlFormatter

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

Constant Summary collapse

SANITIZER_CONFIG = 
Sanitize::Config.merge(Sanitize::Config::RELAXED,
  attributes: Sanitize::Config::RELAXED[:attributes].merge(
    'img' => ['data-trix-attachment', 'data-trix-attributes'],
    :all => (Sanitize::Config::RELAXED[:attributes][:all] || []) + ['data-trix-content-type']
  )
  # Note: No need to specify protocols for 'img' 'src' since 'src' is not allowed
)

Class Method Summary collapse

Class Method Details

.format(content) ⇒ Object 



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# File 'lib/document_to_rich_html/html_formatter.rb', line 17

def self.format(content)
  doc = Nokogiri::HTML.fragment(content)

  # Process images before sanitization
  doc.css('img').each do |img|
    next if img['src'].nil? || !img['src'].start_with?('data:')

    # Ensure data-trix-attachment is preserved
    unless img['data-trix-attachment']
      content_type = img['src'][/^data:(.*?);/, 1] || 'application/octet-stream'
      extension = content_type.split('/')[1] || 'bin'

      img['data-trix-attachment'] = {
        contentType: content_type,
        filename: "image.#{extension}",
        filesize: img['src'].length,
        height: 'auto',
        width: 'auto',
        url: img['src']
      }.to_json
    end

    # Ensure data-trix-attributes is preserved
    img['data-trix-attributes'] ||= '{"presentation":"gallery"}'
  end

  # Sanitize the HTML to prevent XSS attacks
  sanitized_html = Sanitize.fragment(doc.to_html, SANITIZER_CONFIG)

  # Re-parse the sanitized HTML
  doc = Nokogiri::HTML.fragment(sanitized_html)

  # Add data-trix-content-type attributes
  doc.css('p, h1, h2, h3, h4, h5, h6, ul, ol, blockquote, pre, table, tr, td, th, img')
     .each { |node| node['data-trix-content-type'] = node.name }

  doc.to_html
end