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Class: ActiveStorage::Analyzer::ImageAnalyzer::ImageMagick

Overview

This analyzer relies on the third-party MiniMagick gem. MiniMagick requires the ImageMagick system library.

Class Attribute Summary

::ActiveStorage::Analyzer - Inherited

.analyze_later?

Implement this method in concrete subclasses.

Class Method Summary

::ActiveStorage::Analyzer::ImageAnalyzer - Inherited

.accept?

::ActiveSupport::Autoload - Extended

autoload, autoload_at, autoload_under, eager_autoload, eager_load!

::ActiveStorage::Analyzer - Inherited

.accept?

Implement this method in a concrete subclass.
.new

Instance Attribute Summary

::ActiveStorage::Analyzer - Inherited

#blob

Instance Method Summary

::ActiveStorage::Analyzer::ImageAnalyzer - Inherited

#metadata

::ActiveStorage::Analyzer - Inherited

#metadata

Override this method in a concrete subclass.
#download_blob_to_tempfile

Downloads the blob to a tempfile on disk.
#instrument, #logger, #tmpdir

Constructor Details

This class inherits a constructor from ActiveStorage::Analyzer

Class Method Details

.accept?(blob) ⇒ Boolean

[ GitHub ] 

  


# File 'activestorage/lib/active_storage/analyzer/image_analyzer/image_magick.rb', line 16



def self.accept?(blob)
  super && ActiveStorage.variant_processor == :mini_magick
end


  







Instance Method Details



  

    #read_image   (private)
  

  [ GitHub ]


  

  


# File 'activestorage/lib/active_storage/analyzer/image_analyzer/image_magick.rb', line 21



def read_image
  unless MINIMAGICK_AVAILABLE
    logger.error "Skipping image analysis because the mini_magick gem isn't installed"
    return {}
  end

  download_blob_to_tempfile do |file|
    image = instrument("mini_magick") do
      MiniMagick::Image.new(file.path)
    end

    if image.valid?
      yield image
    else
      logger.info "Skipping image analysis because ImageMagick doesn't support the file"
      {}
    end
  rescue MiniMagick::Error => error
    logger.error "Skipping image analysis due to an ImageMagick error: #{error.message}"
    {}
  end
end


  








  

    #rotated_image?(image)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activestorage/lib/active_storage/analyzer/image_analyzer/image_magick.rb', line 44



def rotated_image?(image)
  %w[ RightTop LeftBottom TopRight BottomLeft ].include?(image["%[orientation]"])
end