Class: AstroSubframeOrganizer::Utils::RawStripper

Inherits:
Object
  • Object
show all
Defined in:
lib/astro_subframe_organizer/utils/raw_stripper.rb

Overview

Strips RAW files down to their metadata by creating a MIE (Metadata Information Extraction) file using exiftool. This is useful for users who want to keep metadata but remove large image data from their RAW files, for example to generate test fixtures where metadata is important, but image data is not needed.

Instance Method Summary collapse

Constructor Details

#initialize(input_path, output_path) ⇒ RawStripper

Returns a new instance of RawStripper.



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# File 'lib/astro_subframe_organizer/utils/raw_stripper.rb', line 12

def initialize(input_path, output_path)
  @input = input_path
  @output = output_path
end

Instance Method Details

#already_stripped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/astro_subframe_organizer/utils/raw_stripper.rb', line 17

def already_stripped?
  # A stripped RAW (MIE file) is typically under 1MB,
  # whereas a real RAW is 20MB+.
  return false unless File.exist?(@output)

  File.size(@output) < 1_048_576
end

#strip ⇒ Object

rubocop:disable Naming/PredicateMethod



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# File 'lib/astro_subframe_organizer/utils/raw_stripper.rb', line 25

def strip # rubocop:disable Naming/PredicateMethod
  # We use exiftool to create a Metadata Information Extraction (MIE) file.
  # This contains all metadata but zero image data.
  # We then save it with the original extension so the parsers recognize it.
  tmp_mie = "#{@output}.mie"
  Exiftool.command = 'exiftool.exe' if Gem.win_platform?

  # -o specifies the output file. exiftool creates a MIE file if the extension is .mie
  # -all:all ensures we copy all metadata blocks (EXIF, MakerNotes, etc.)
  success = system("#{Exiftool.command} -o \"#{tmp_mie}\" -all:all \"#{@input}\" > /dev/null 2>&1")

  if success && File.exist?(tmp_mie)
    FileUtils.mkdir_p(File.dirname(@output))
    FileUtils.mv(tmp_mie, @output, force: true)
    true
  else
    FileUtils.rm_f(tmp_mie)
    false
  end
end