Class: SvgInlineFileExtractor::InlineImage

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

Constant Summary collapse

DATA_IMAGE_HEADER_PATTERN =

Regex pattern to match against the beginning of the href string. the type, if found, will be the raw string, eg: jpeg, jpg, png, etc.

/data:image\/(?<type>.+);base64\,/.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(nokogiri_element) ⇒ InlineImage 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 15

def initialize(nokogiri_element)
  self.nokogiri_element = nokogiri_element
  self.href_contents = nokogiri_element.value
end

Instance Attribute Details

#href_contents ⇒ Object 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 12

def href_contents
  @href_contents
end

#nokogiri_element ⇒ Object 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 12

def nokogiri_element
  @nokogiri_element
end

Instance Method Details

#binary_image ⇒ String

Note:

I’m not sure if memoization is the best here, let’s see what happens in the wild.

Returns Base64 decoded binary image from href.



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 61

def binary_image
  @binary_image ||= Base64.decode64(without_header)
end

#declared_image_type ⇒ String|Nil 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 21

def declared_image_type
  @declared_image_type ||= begin
    if (match = href_contents.match(DATA_IMAGE_HEADER_PATTERN))
      match[:type]
    end
  end
end

#element_class ⇒ String | nil 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 40

def element_class
  @element_class ||= get_attribute('class')
end

#element_id ⇒ String | nil 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 35

def element_id
  @element_id ||= get_attribute('id')
end

#get_attribute(attribute) ⇒ String | Nil 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 46

def get_attribute(attribute)
  attribute = nokogiri_element.parent.attribute(attribute)
  attribute.value if attribute
end

#inline_image? ⇒ Boolean 



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 30

def inline_image?
  !!declared_image_type
end

#set_binary_image_from_uri! ⇒ Boolean

If the image href is set to a URI, attempt to download/open and convert to an

base64 encoded inline image

Raises:



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# File 'lib/svg_inline_file_extractor/inline_image.rb', line 69

def set_binary_image_from_uri!
  unless SvgInlineFileExtractor.use_mini_magick?
    raise MiniMagickMissing, '#set_binary_image_from_uri! requires the MiniMagick gem to be installed.'
  end
  SvgInlineFileExtractor.with_temp_image(nokogiri_element.value) do |temp_image|
    format = SvgInlineFileExtractor.identify_image(temp_image).to_s.downcase
    nokogiri_element.value = "data:image/#{format};base64,#{encode(temp_image)}"
    nokogiri_element.name = 'href'
  end
  true
end