Import Upstream version 2.7.1upstream/2.7.1

1 files changed, 626 insertions, 0 deletions

diff --git a/lib/roo/open_office.rb b/lib/roo/open_office.rb
new file mode 100644
index 0000000..6ccbe85
--- /dev/null
+++ b/lib/roo/open_office.rb
@@ -0,0 +1,626 @@
+require 'date'
+require 'nokogiri'
+require 'cgi'
+require 'zip/filesystem'
+require 'roo/font'
+require 'roo/tempdir'
+require 'base64'
+require 'openssl'
+
+module Roo
+  class OpenOffice < Roo::Base
+    extend Roo::Tempdir
+
+    ERROR_MISSING_CONTENT_XML = 'file missing required content.xml'.freeze
+    XPATH_FIND_TABLE_STYLES   = "//*[local-name()='automatic-styles']".freeze
+    XPATH_LOCAL_NAME_TABLE    = "//*[local-name()='table']".freeze
+
+    # initialization and opening of a spreadsheet file
+    # values for packed: :zip
+    def initialize(filename, options = {})
+      packed       = options[:packed]
+      file_warning = options[:file_warning] || :error
+
+      @only_visible_sheets = options[:only_visible_sheets]
+      file_type_check(filename, '.ods', 'an Roo::OpenOffice', file_warning, packed)
+      # NOTE: Create temp directory and allow Ruby to cleanup the temp directory
+      #       when the object is garbage collected. Initially, the finalizer was
+      #       created in the Roo::Tempdir module, but that led to a segfault
+      #       when testing in Ruby 2.4.0.
+      @tmpdir = self.class.make_tempdir(self, find_basename(filename), options[:tmpdir_root])
+      ObjectSpace.define_finalizer(self, self.class.finalize(object_id))
+      @filename = local_filename(filename, @tmpdir, packed)
+      # TODO: @cells_read[:default] = false
+      open_oo_file(options)
+      super(filename, options)
+      initialize_default_variables
+
+      unless @table_display.any?
+        doc.xpath(XPATH_FIND_TABLE_STYLES).each do |style|
+          read_table_styles(style)
+        end
+      end
+
+      @sheet_names = doc.xpath(XPATH_LOCAL_NAME_TABLE).map do |sheet|
+        if !@only_visible_sheets || @table_display[attribute(sheet, 'style-name')]
+          sheet.attributes['name'].value
+        end
+      end.compact
+    rescue
+      self.class.finalize_tempdirs(object_id)
+      raise
+    end
+
+    def open_oo_file(options)
+      Zip::File.open(@filename) do |zip_file|
+        content_entry = zip_file.glob('content.xml').first
+        fail ArgumentError, ERROR_MISSING_CONTENT_XML unless content_entry
+
+        roo_content_xml_path = ::File.join(@tmpdir, 'roo_content.xml')
+        content_entry.extract(roo_content_xml_path)
+        decrypt_if_necessary(zip_file, content_entry, roo_content_xml_path, options)
+      end
+    end
+
+    def initialize_default_variables
+      @formula                = {}
+      @style                  = {}
+      @style_defaults         = Hash.new { |h, k| h[k] = [] }
+      @table_display          = Hash.new { |h, k| h[k] = true }
+      @font_style_definitions = {}
+      @comment                = {}
+      @comments_read          = {}
+    end
+
+    def method_missing(m, *args)
+      read_labels
+      # is method name a label name
+      if @label.key?(m.to_s)
+        row, col = label(m.to_s)
+        cell(row, col)
+      else
+        # call super for methods like #a1
+        super
+      end
+    end
+
+    # Returns the content of a spreadsheet-cell.
+    # (1,1) is the upper left corner.
+    # (1,1), (1,'A'), ('A',1), ('a',1) all refers to the
+    # cell at the first line and first row.
+    def cell(row, col, sheet = nil)
+      sheet ||= default_sheet
+      read_cells(sheet)
+      row, col = normalize(row, col)
+      if celltype(row, col, sheet) == :date
+        yyyy, mm, dd = @cell[sheet][[row, col]].to_s.split('-')
+        return Date.new(yyyy.to_i, mm.to_i, dd.to_i)
+      end
+
+      @cell[sheet][[row, col]]
+    end
+
+    # Returns the formula at (row,col).
+    # Returns nil if there is no formula.
+    # The method #formula? checks if there is a formula.
+    def formula(row, col, sheet = nil)
+      sheet ||= default_sheet
+      read_cells(sheet)
+      row, col = normalize(row, col)
+      @formula[sheet][[row, col]]
+    end
+
+    # Predicate methods really should return a boolean
+    # value. Hopefully no one was relying on the fact that this
+    # previously returned either nil/formula
+    def formula?(*args)
+      !!formula(*args)
+    end
+
+    # returns each formula in the selected sheet as an array of elements
+    # [row, col, formula]
+    def formulas(sheet = nil)
+      sheet ||= default_sheet
+      read_cells(sheet)
+      return [] unless @formula[sheet]
+      @formula[sheet].each.collect do |elem|
+        [elem[0][0], elem[0][1], elem[1]]
+      end
+    end
+
+    # Given a cell, return the cell's style
+    def font(row, col, sheet = nil)
+      sheet ||= default_sheet
+      read_cells(sheet)
+      row, col   = normalize(row, col)
+      style_name = @style[sheet][[row, col]] || @style_defaults[sheet][col - 1] || 'Default'
+      @font_style_definitions[style_name]
+    end
+
+    # returns the type of a cell:
+    # * :float
+    # * :string
+    # * :date
+    # * :percentage
+    # * :formula
+    # * :time
+    # * :datetime
+    def celltype(row, col, sheet = nil)
+      sheet ||= default_sheet
+      read_cells(sheet)
+      row, col = normalize(row, col)
+      @formula[sheet][[row, col]] ? :formula : @cell_type[sheet][[row, col]]
+    end
+
+    def sheets
+      @sheet_names
+    end
+
+    # version of the Roo::OpenOffice document
+    # at 2007 this is always "1.0"
+    def officeversion
+      oo_version
+      @officeversion
+    end
+
+    # shows the internal representation of all cells
+    # mainly for debugging purposes
+    def to_s(sheet = nil)
+      sheet ||= default_sheet
+      read_cells(sheet)
+      @cell[sheet].inspect
+    end
+
+    # returns the row,col values of the labelled cell
+    # (nil,nil) if label is not defined
+    def label(labelname)
+      read_labels
+      return [nil, nil, nil] if @label.size < 1 || !@label.key?(labelname)
+      [
+        @label[labelname][1].to_i,
+        ::Roo::Utils.letter_to_number(@label[labelname][2]),
+        @label[labelname][0]
+      ]
+    end
+
+    # Returns an array which all labels. Each element is an array with
+    # [labelname, [row,col,sheetname]]
+    def labels(_sheet = nil)
+      read_labels
+      @label.map do |label|
+        [label[0], # name
+         [label[1][1].to_i, # row
+          ::Roo::Utils.letter_to_number(label[1][2]), # column
+          label[1][0], # sheet
+         ]]
+      end
+    end
+
+    # returns the comment at (row/col)
+    # nil if there is no comment
+    def comment(row, col, sheet = nil)
+      sheet ||= default_sheet
+      read_cells(sheet)
+      row, col = normalize(row, col)
+      return nil unless @comment[sheet]
+      @comment[sheet][[row, col]]
+    end
+
+    # returns each comment in the selected sheet as an array of elements
+    # [row, col, comment]
+    def comments(sheet = nil)
+      sheet ||= default_sheet
+      read_comments(sheet) unless @comments_read[sheet]
+      return [] unless @comment[sheet]
+      @comment[sheet].each.collect do |elem|
+        [elem[0][0], elem[0][1], elem[1]]
+      end
+    end
+
+    private
+
+    # If the ODS file has an encryption-data element, then try to decrypt.
+    # If successful, the temporary content.xml will be overwritten with
+    # decrypted contents.
+    def decrypt_if_necessary(
+      zip_file,
+      content_entry,
+      roo_content_xml_path, options
+    )
+      # Check if content.xml is encrypted by extracting manifest.xml
+      # and searching for a manifest:encryption-data element
+
+      if (manifest_entry = zip_file.glob('META-INF/manifest.xml').first)
+        roo_manifest_xml_path = File.join(@tmpdir, 'roo_manifest.xml')
+        manifest_entry.extract(roo_manifest_xml_path)
+        manifest        = ::Roo::Utils.load_xml(roo_manifest_xml_path)
+
+        # XPath search for manifest:encryption-data only for the content.xml
+        # file
+
+        encryption_data = manifest.xpath(
+          "//manifest:file-entry[@manifest:full-path='content.xml']"\
+        "/manifest:encryption-data"
+        ).first
+
+        # If XPath returns a node, then we know content.xml is encrypted
+
+        unless encryption_data.nil?
+
+          # Since we know it's encrypted, we check for the password option
+          # and if it doesn't exist, raise an argument error
+
+          password = options[:password]
+          if !password.nil?
+            perform_decryption(
+              encryption_data,
+              password,
+              content_entry,
+              roo_content_xml_path
+            )
+          else
+            fail ArgumentError, 'file is encrypted but password was not supplied'
+          end
+        end
+      else
+        fail ArgumentError, 'file missing required META-INF/manifest.xml'
+      end
+    end
+
+    # Process the ODS encryption manifest and perform the decryption
+    def perform_decryption(
+      encryption_data,
+      password,
+      content_entry,
+      roo_content_xml_path
+    )
+      # Extract various expected attributes from the manifest that
+      # describe the encryption
+
+      algorithm_node            = encryption_data.xpath('manifest:algorithm').first
+      key_derivation_node       =
+        encryption_data.xpath('manifest:key-derivation').first
+      start_key_generation_node =
+        encryption_data.xpath('manifest:start-key-generation').first
+
+      # If we have all the expected elements, then we can perform
+      # the decryption.
+
+      if !algorithm_node.nil? && !key_derivation_node.nil? &&
+         !start_key_generation_node.nil?
+
+        # The algorithm is a URI describing the algorithm used
+        algorithm           = algorithm_node['manifest:algorithm-name']
+
+        # The initialization vector is base-64 encoded
+        iv                  = Base64.decode64(
+          algorithm_node['manifest:initialisation-vector']
+        )
+        key_derivation_name = key_derivation_node['manifest:key-derivation-name']
+        iteration_count     = key_derivation_node['manifest:iteration-count'].to_i
+        salt                = Base64.decode64(key_derivation_node['manifest:salt'])
+
+        # The key is hashed with an algorithm represented by this URI
+        key_generation_name =
+          start_key_generation_node[
+            'manifest:start-key-generation-name'
+          ]
+
+        hashed_password = password
+
+        if key_generation_name == 'http://www.w3.org/2000/09/xmldsig#sha256'
+
+          hashed_password = Digest::SHA256.digest(password)
+        else
+          fail ArgumentError, "Unknown key generation algorithm #{key_generation_name}"
+        end
+
+        cipher = find_cipher(
+          algorithm,
+          key_derivation_name,
+          hashed_password,
+          salt,
+          iteration_count,
+          iv
+        )
+
+        begin
+          decrypted = decrypt(content_entry, cipher)
+
+          # Finally, inflate the decrypted stream and overwrite
+          # content.xml
+          IO.binwrite(
+            roo_content_xml_path,
+            Zlib::Inflate.new(-Zlib::MAX_WBITS).inflate(decrypted)
+          )
+        rescue StandardError => error
+          raise ArgumentError, "Invalid password or other data error: #{error}"
+        end
+      else
+        fail ArgumentError, 'manifest.xml missing encryption-data elements'
+      end
+    end
+
+    # Create a cipher based on an ODS algorithm URI from manifest.xml
+    # params: algorithm, key_derivation_name, hashed_password, salt, iteration_count, iv
+    def find_cipher(*args)
+      fail ArgumentError, 'Unknown algorithm ' + algorithm unless args[0] == 'http://www.w3.org/2001/04/xmlenc#aes256-cbc'
+
+      cipher = ::OpenSSL::Cipher.new('AES-256-CBC')
+      cipher.decrypt
+      cipher.padding = 0
+      cipher.key     = find_cipher_key(cipher, *args[1..4])
+      cipher.iv      = args[5]
+
+      cipher
+    end
+
+    # Create a cipher key based on an ODS algorithm string from manifest.xml
+    def find_cipher_key(*args)
+      fail ArgumentError, 'Unknown key derivation name ', args[1] unless args[1] == 'PBKDF2'
+
+      ::OpenSSL::PKCS5.pbkdf2_hmac_sha1(args[2], args[3], args[4], args[0].key_len)
+    end
+
+    # Block decrypt raw bytes from the zip file based on the cipher
+    def decrypt(content_entry, cipher)
+      # Zip::Entry.extract writes a 0-length file when trying
+      # to extract an encrypted stream, so we read the
+      # raw bytes based on the offset and lengths
+      decrypted = ''
+      File.open(@filename, 'rb') do |zipfile|
+        zipfile.seek(
+          content_entry.local_header_offset +
+            content_entry.calculate_local_header_size
+        )
+        total_to_read = content_entry.compressed_size
+
+        block_size = 4096
+        block_size = total_to_read if block_size > total_to_read
+
+        while (buffer = zipfile.read(block_size))
+          decrypted     += cipher.update(buffer)
+          total_to_read -= buffer.length
+
+          break if total_to_read == 0
+
+          block_size = total_to_read if block_size > total_to_read
+        end
+      end
+
+      decrypted + cipher.final
+    end
+
+    def doc
+      @doc ||= ::Roo::Utils.load_xml(File.join(@tmpdir, 'roo_content.xml'))
+    end
+
+    # read the version of the OO-Version
+    def oo_version
+      doc.xpath("//*[local-name()='document-content']").each do |office|
+        @officeversion = attribute(office, 'version')
+      end
+    end
+
+    # helper function to set the internal representation of cells
+    def set_cell_values(sheet, x, y, i, v, value_type, formula, table_cell, str_v, style_name)
+      key = [y, x + i]
+      @cell_type[sheet] ||= {}
+      @cell_type[sheet][key] = value_type.to_sym if value_type
+      @formula[sheet] ||= {}
+      if formula
+        ['of:', 'oooc:'].each do |prefix|
+          if formula[0, prefix.length] == prefix
+            formula = formula[prefix.length..-1]
+          end
+        end
+        @formula[sheet][key] = formula
+      end
+      @cell[sheet] ||= {}
+      @style[sheet] ||= {}
+      @style[sheet][key] = style_name
+      case @cell_type[sheet][key]
+      when :float
+        @cell[sheet][key] = (table_cell.attributes['value'].to_s.include?(".") || table_cell.children.first.text.include?(".")) ? v.to_f : v.to_i
+      when :percentage
+        @cell[sheet][key] = v.to_f
+      when :string
+        @cell[sheet][key] = str_v
+      when :date
+        # TODO: if table_cell.attributes['date-value'].size != "XXXX-XX-XX".size
+        if attribute(table_cell, 'date-value').size != 'XXXX-XX-XX'.size
+          #-- dann ist noch eine Uhrzeit vorhanden
+          #-- "1961-11-21T12:17:18"
+          @cell[sheet][key]      = DateTime.parse(attribute(table_cell, 'date-value').to_s)
+          @cell_type[sheet][key] = :datetime
+        else
+          @cell[sheet][key] = table_cell.attributes['date-value']
+        end
+      when :time
+        hms = v.split(':')
+        @cell[sheet][key] = hms[0].to_i * 3600 + hms[1].to_i * 60 + hms[2].to_i
+      else
+        @cell[sheet][key] = v
+      end
+    end
+
+    # read all cells in the selected sheet
+    #--
+    # the following construct means '4 blanks'
+    # some content <text:s text:c="3"/>
+    #++
+    def read_cells(sheet = default_sheet)
+      validate_sheet!(sheet)
+      return if @cells_read[sheet]
+
+      sheet_found = false
+      doc.xpath("//*[local-name()='table']").each do |ws|
+        next unless sheet == attribute(ws, 'name')
+
+        sheet_found = true
+        col         = 1
+        row         = 1
+        ws.children.each do |table_element|
+          case table_element.name
+          when 'table-column'
+            @style_defaults[sheet] << table_element.attributes['default-cell-style-name']
+          when 'table-row'
+            if table_element.attributes['number-rows-repeated']
+              skip_row = attribute(table_element, 'number-rows-repeated').to_s.to_i
+              row      = row + skip_row - 1
+            end
+            table_element.children.each do |cell|
+              skip_col   = attribute(cell, 'number-columns-repeated')
+              formula    = attribute(cell, 'formula')
+              value_type = attribute(cell, 'value-type')
+              v          = attribute(cell, 'value')
+              style_name = attribute(cell, 'style-name')
+              case value_type
+              when 'string'
+                str_v      = ''
+                # insert \n if there is more than one paragraph
+                para_count = 0
+                cell.children.each do |str|
+                  # begin comments
+                  #=begin
+                  #- <table:table-cell office:value-type="string">
+                  #  - <office:annotation office:display="true" draw:style-name="gr1" draw:text-style-name="P1" svg:width="1.1413in" svg:height="0.3902in" svg:x="2.0142in" svg:y="0in" draw:caption-point-x="-0.2402in" draw:caption-point-y="0.5661in">
+                  #      <dc:date>2011-09-20T00:00:00</dc:date>
+                  #      <text:p text:style-name="P1">Kommentar fuer B4</text:p>
+                  #    </office:annotation>
+                  #    <text:p>B4 (mit Kommentar)</text:p>
+                  #  </table:table-cell>
+                  #=end
+                  if str.name == 'annotation'
+                    str.children.each do |annotation|
+                      next unless annotation.name == 'p'
+                      # @comment ist ein Hash mit Sheet als Key (wie bei @cell)
+                      # innerhalb eines Elements besteht ein Eintrag aus einem
+                      # weiteren Hash mit Key [row,col] und dem eigentlichen
+                      # Kommentartext als Inhalt
+                      @comment[sheet]      = Hash.new unless @comment[sheet]
+                      key                  = [row, col]
+                      @comment[sheet][key] = annotation.text
+                    end
+                  end
+                  # end comments
+                  if str.name == 'p'
+                    v          = str.content
+                    str_v      += "\n" if para_count > 0
+                    para_count += 1
+                    if str.children.size > 1
+                      str_v += children_to_string(str.children)
+                    else
+                      str.children.each do |child|
+                        str_v += child.content #.text
+                      end
+                    end
+                    str_v.gsub!(/&apos;/, "'") # special case not supported by unescapeHTML
+                    str_v = CGI.unescapeHTML(str_v)
+                  end # == 'p'
+                end
+              when 'time'
+                cell.children.each do |str|
+                  v = str.content if str.name == 'p'
+                end
+              when '', nil, 'date', 'percentage', 'float'
+                #
+              when 'boolean'
+                v = attribute(cell, 'boolean-value').to_s
+              end
+              if skip_col
+                if !v.nil? || cell.attributes['date-value']
+                  0.upto(skip_col.to_i - 1) do |i|
+                    set_cell_values(sheet, col, row, i, v, value_type, formula, cell, str_v, style_name)
+                  end
+                end
+                col += (skip_col.to_i - 1)
+              end # if skip
+              set_cell_values(sheet, col, row, 0, v, value_type, formula, cell, str_v, style_name)
+              col += 1
+            end
+            row += 1
+            col = 1
+          end
+        end
+      end
+      doc.xpath("//*[local-name()='automatic-styles']").each do |style|
+        read_styles(style)
+      end
+
+      fail RangeError unless sheet_found
+
+      @cells_read[sheet]    = true
+      @comments_read[sheet] = true
+    end
+
+    # Only calls read_cells because Roo::Base calls read_comments
+    # whereas the reading of comments is done in read_cells for Roo::OpenOffice-objects
+    def read_comments(sheet = nil)
+      read_cells(sheet)
+    end
+
+    def read_labels
+      @label ||= Hash[doc.xpath('//table:named-range').map do |ne|
+        #-
+        # $Sheet1.$C$5
+        #+
+        name              = attribute(ne, 'name').to_s
+        sheetname, coords = attribute(ne, 'cell-range-address').to_s.split('.$')
+        col, row          = coords.split('$')
+        sheetname         = sheetname[1..-1] if sheetname[0, 1] == '$'
+        [name, [sheetname, row, col]]
+      end]
+    end
+
+    def read_styles(style_elements)
+      @font_style_definitions['Default'] = Roo::Font.new
+      style_elements.each do |style|
+        next unless style.name == 'style'
+        style_name = attribute(style, 'name')
+        style.each do |properties|
+          font                                = Roo::OpenOffice::Font.new
+          font.bold                           = attribute(properties, 'font-weight')
+          font.italic                         = attribute(properties, 'font-style')
+          font.underline                      = attribute(properties, 'text-underline-style')
+          @font_style_definitions[style_name] = font
+        end
+      end
+    end
+
+    def read_table_styles(styles)
+      styles.children.each do |style|
+        next unless style.name == 'style'
+        style_name = attribute(style, 'name')
+        style.children.each do |properties|
+          display = attribute(properties, 'display')
+          next unless display
+          @table_display[style_name] = (display == 'true')
+        end
+      end
+    end
+
+    # helper method to convert compressed spaces and other elements within
+    # an text into a string
+    # FIXME: add a test for compressed_spaces == 0. It's not currently tested.
+    def children_to_string(children)
+      children.map do |child|
+        if child.text?
+          child.content
+        else
+          if child.name == 's'
+            compressed_spaces = child.attributes['c'].to_s.to_i
+            # no explicit number means a count of 1:
+            compressed_spaces == 0 ? ' ' : ' ' * compressed_spaces
+          else
+            child.content
+          end
+        end
+      end.join
+    end
+
+    def attribute(node, attr_name)
+      node.attributes[attr_name].value if node.attributes[attr_name]
+    end
+  end
+end