Class: Uniword::Transformation::MhtmlMetadataBuilder Private

Inherits:
Object
  • Object
show all
Defined in:
lib/uniword/transformation/mhtml_metadata_builder.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Builds metadata, document properties, and file parts for MHTML output.

Extracted from OoxmlToMhtmlConverter for separation of responsibilities.

Instance Method Summary collapse

Constructor Details

#initialize(document, core_properties, relationships, document_name) ⇒ MhtmlMetadataBuilder

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of MhtmlMetadataBuilder.



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 11

def initialize(document, core_properties, relationships, document_name)
  @document = document
  @core_properties = core_properties
  @relationships = relationships
  @provided_document_name = document_name
end

Instance Method Details

#build_custom_document_properties ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Build o:CustomDocumentProperties for AssetID and other custom fields



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 139

def build_custom_document_properties
  asset_id = custom_property("AssetID")
  return "" unless asset_id

  <<~XML
    <o:CustomDocumentProperties xmlns:o="urn:schemas-microsoft-com:office:office">
     <o:AssetID dt:dt="string">#{escape_xml(asset_id)}</o:AssetID>
    </o:CustomDocumentProperties>
  XML
end

#build_document_properties ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Build document properties from core properties



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 48

def build_document_properties
  props = Uniword::Mhtml::Metadata::DocumentProperties.new
  cp = core_properties

  if cp
    props.author = cp.creator.to_s if cp.respond_to?(:creator) && cp.creator
    props.created = cp.created.value.to_s if cp.respond_to?(:created) && cp.created
    props.last_author = cp.last_modified_by.to_s if cp.respond_to?(:last_modified_by) && cp.last_modified_by
    props.last_saved = cp.modified.value.to_s if cp.respond_to?(:modified) && cp.modified
    props.pages = cp.pages.to_s if cp.respond_to?(:pages) && cp.pages
    props.words = cp.words.to_s if cp.respond_to?(:words) && cp.words
    props.characters = cp.characters.to_s if cp.respond_to?(:characters) && cp.characters
    props.application = "Microsoft Word"
  end

  props
end

#build_filelist_part ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Build filelist.xml part



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 67

def build_filelist_part
  image_entries = if @document.image_parts && !@document.image_parts.empty?
                    @document.image_parts.map do |_r_id, image_data|
                      %(<o:File HRef="#{image_data[:target]}"/>)
                    end.join("\n            ")
                  else
                    ""
                  end

  filelist_xml = <<~XML
    <xml xmlns:o="urn:schemas-microsoft-com:office:office">
      <o:MainFile HRef="../#{document_name}.htm"/>
      <o:File HRef="filelist.xml"/>
      #{image_entries}
    </xml>
  XML

  part = Uniword::Mhtml::XmlPart.new
  part.content_type = 'text/xml; charset="utf-8"'
  part.content_transfer_encoding = "quoted-printable"
  part.raw_content = filelist_xml
  part.content_location = "file:///C:/D057922B/#{document_name}.fld/filelist.xml"

  part
end

#build_image_parts ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Build image parts from document.image_parts



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 94

def build_image_parts
  return [] unless @document.image_parts && !@document.image_parts.empty?

  @document.image_parts.map do |_r_id, image_data|
    part = Uniword::Mhtml::ImagePart.new
    part.content_type = image_data[:content_type] || "image/png"
    part.content_transfer_encoding = "base64"
    part.raw_content = image_data[:data]
    part.content_location = "file:///C:/D057922B/#{document_name}.fld/#{image_data[:target]}"
    part
  end
end

#build_link_tags ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Build link tags for the head



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 161

def build_link_tags
  <<~LINK
    <link rel=File-List href="#{document_name}.fld/filelist.xml">
  LINK
end

#build_meta_tags ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Build meta tags for the head



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 151

def build_meta_tags
  <<~META
    <meta http-equiv=Content-Type content="text/html; charset=utf-8">
    <meta name=ProgId content=Word.Document>
    <meta name=Generator content="Microsoft Word 15">
    <meta name=Originator content="Microsoft Word 15">
  META
end

#build_metadata_comments ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Build the o:DocumentProperties content lines



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 108

def build_metadata_comments
  props = core_properties
  return "" unless props

  author = props.respond_to?(:creator) ? props.creator : nil
  last_author = props.respond_to?(:last_modified_by) ? props.last_modified_by : nil
  revision = props.respond_to?(:revision) ? props.revision : nil
  created = props.respond_to?(:created) && props.created ? props.created.value : nil
  last_saved = props.respond_to?(:modified) && props.modified ? props.modified.value : nil

  stats = calculate_document_stats

  doc_props = []
  doc_props << " <o:Author>#{escape_xml(author)}</o:Author>" if author
  doc_props << " <o:LastAuthor>#{escape_xml(last_author)}</o:LastAuthor>" if last_author
  doc_props << " <o:Revision>#{escape_xml(revision)}</o:Revision>" if revision
  doc_props << " <o:TotalTime>0</o:TotalTime>"
  doc_props << " <o:Created>#{escape_xml(created)}</o:Created>" if created
  doc_props << " <o:LastSaved>#{escape_xml(last_saved)}</o:LastSaved>" if last_saved
  doc_props << " <o:Pages>#{stats[:pages]}</o:Pages>"
  doc_props << " <o:Words>#{stats[:words]}</o:Words>"
  doc_props << " <o:Characters>#{stats[:characters]}</o:Characters>"
  doc_props << " <o:Lines>#{stats[:lines]}</o:Lines>"
  doc_props << " <o:Paragraphs>#{stats[:paragraphs]}</o:Paragraphs>"
  doc_props << " <o:CharactersWithSpaces>#{stats[:characters_with_spaces]}</o:CharactersWithSpaces>"
  doc_props << " <o:Version>16.00</o:Version>"

  doc_props.join("\n")
end

#core_properties ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Get the core properties to use (provided or from document)



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 19

def core_properties
  @core_properties || @document.core_properties
end

#document_name ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Get document name - use provided name, or extract from relationships, or default



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# File 'lib/uniword/transformation/mhtml_metadata_builder.rb', line 25

def document_name
  @document_name ||= @provided_document_name || begin
    if @relationships
      rel = @relationships.relationships.find do |r|
        r.target.to_s.include?("document.xml")
      end
      if rel
        target = rel.target
        parts = target.split("/")
        return parts.last.sub(/\.xml$/, "") if parts.last
      end
    end
    location = @document.document_rels&.relationships&.first&.target || "document"
    File.basename(location, ".*")
  rescue StandardError => e
    Uniword.logger&.debug do
      "Falling back to 'document' name: #{e.message}"
    end
    "document"
  end
end