Class: Epuber::FromFileExecutor

Inherits:
Object
  • Object
show all
Defined in:
lib/epuber/from_file/from_file_executor.rb

Constant Summary collapse

MIMETYPE_PATH = 
'mimetype'
ENCRYPTION_PATH = 
'META-INF/encryption.xml'
CONTAINER_PATH = 
'META-INF/container.xml'

Instance Method Summary collapse

Constructor Details

#initialize(filepath) ⇒ FromFileExecutor

Returns a new instance of FromFileExecutor.

Parameters:

  • filepath (String) —

    path to EPUB file



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# File 'lib/epuber/from_file/from_file_executor.rb', line 19

def initialize(filepath)
  @filepath = filepath
end

Instance Method Details

#content_opf_path ⇒ String

Parameters:

  • zip_file (Zip::File)

Returns:

  • (String) 


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# File 'lib/epuber/from_file/from_file_executor.rb', line 76

def content_opf_path
  entry = @zip_file.find_entry(CONTAINER_PATH)
  UI.error! "This is not valid EPUB file (#{CONTAINER_PATH} file is missing)" if entry.nil?

  doc = Nokogiri::XML(@zip_file.read(entry))
  doc.remove_namespaces!

  rootfile = doc.at_xpath('//rootfile')
  if rootfile.nil?
    UI.error! "This is not valid EPUB file (#{CONTAINER_PATH} file does not contain any <rootfile> element)"
  end

  rootfile['full-path']
end

#export_files ⇒ Object 



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# File 'lib/epuber/from_file/from_file_executor.rb', line 108

def export_files
  @opf.manifest_items.each_value do |item|
    # ignore text files which are not in spine
    text_file_extensions = %w[.xhtml .html]
    extension = File.extname(item.href).downcase
    if text_file_extensions.include?(extension) &&
       @opf.spine_items.none? { |spine_item| spine_item.idref == item.id }
      UI.puts "  Skipping #{item.href} (not in spine)"
      next
    end

    # ignore ncx file
    if item.media_type == 'application/x-dtbncx+xml'
      UI.puts "  Skipping #{item.href} (ncx file)"
      next
    end

    full_path = Pathname.new(@opf_path)
                        .dirname
                        .join(item.href)
                        .to_s

    UI.puts "  Exporting #{item.href} (from #{full_path})"

    contents = @zip_file.read(full_path)
    contents = @encryption_handler.process_file(full_path, contents) if @encryption_handler

    FileUtils.mkdir_p(File.dirname(item.href))
    File.write(item.href, contents)
  end
end

#generate_bookspec ⇒ String

Parameters:

  • opf (Nokogiri::XML::Document)
  • zip_file (Zip::File)

Returns:

  • (String) 


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# File 'lib/epuber/from_file/from_file_executor.rb', line 95

def generate_bookspec
  nav_node, nav_mode = @opf.find_nav
  if nav_node
    nav_path = Pathname.new(@opf_path)
                       .dirname
                       .join(nav_node.href)
                       .to_s
    nav = NavFile.new(@zip_file.read(nav_path), nav_mode)
  end

  BookspecGenerator.new(@opf, nav).generate_bookspec
end

#run ⇒ Object 



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# File 'lib/epuber/from_file/from_file_executor.rb', line 23

def run
  UI.puts "📖 Loading EPUB file #{@filepath}"

  Zip::File.open(@filepath) do |zip_file|
    @zip_file = zip_file

    validate_mimetype

    @opf_path = content_opf_path
    UI.puts "  Parsing OPF file at #{@opf_path}"
    @opf = OpfFile.new(zip_file.read(@opf_path))

    if zip_file.find_entry(ENCRYPTION_PATH)
      UI.puts '  Parsing encryption.xml file'
      @encryption_handler = EncryptionHandler.new(zip_file.read(ENCRYPTION_PATH), @opf)
    end

    UI.puts '  Generating bookspec file'
    basename = File.basename(@filepath, File.extname(@filepath))
    File.write("#{basename}.bookspec", generate_bookspec)

    export_files

    UI.puts '' # empty line
    UI.puts <<~TEXT.rstrip.ansi.green
      🎉 Project initialized.
      Please review generated #{basename}.bookspec file and start using Epuber.

      For more information about Epuber, please visit https://github.com/epuber-io/epuber/tree/master/docs.
    TEXT
  end
end

#validate_mimetype ⇒ void

This method returns an undefined value.

Parameters:

  • zip_file (Zip::File) 


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# File 'lib/epuber/from_file/from_file_executor.rb', line 60

def validate_mimetype
  entry = @zip_file.find_entry(MIMETYPE_PATH)
  UI.error! "This is not valid EPUB file (#{MIMETYPE_PATH} file is missing)" if entry.nil?

  mimetype = @zip_file.read(entry)

  return if mimetype == 'application/epub+zip'

  UI.error! <<~MSG
    This is not valid EPUB file (#{MIMETYPE_PATH} file does not contain required application/epub+zip, it is #{mimetype} instead)
  MSG
end