Class: Libis::Format::Tool::MsgToPdf

Inherits:
Object
  • Object
show all
Includes:
Tools::Logger
Defined in:
lib/libis/format/tool/msg_to_pdf.rb

Constant Summary collapse

HEADER_STYLE = 
'<style>.header-table {margin: 0 0 20 0;padding: 0;font-family: Arial, Helvetica, sans-serif;}.header-name {padding-right: 5px;color: #9E9E9E;text-align: right;vertical-align: top;font-size: 12px;}.header-value {font-size: 12px;}#header_fields {background: white;margin: 0;border: 1px solid #DDD;border-radius: 3px;padding: 8px;width: 100%%;box-sizing: border-box;}</style><script type="text/javascript">function timer() {try {parent.postMessage(Math.max(document.body.offsetHeight, document.body.scrollHeight), \'*\');} catch (r) {}setTimeout(timer, 10);};timer();</script>'
HEADER_TABLE_TEMPLATE = 
'<div class="header-table"><table id="header_fields"><tbody>%s</tbody></table></div>'
HEADER_FIELD_TEMPLATE = 
'<tr><td class="header-name">%s</td><td class="header-value">%s</td></tr>'
HTML_WRAPPER_TEMPLATE = 
'<!DOCTYPE html><html><head><style>body {font-size: 0.5cm;}</style><title>title</title></head><body>%s</body></html>'
IMG_CID_PLAIN_REGEX = 
%r/\[cid:(.*?)\]/m
IMG_CID_HTML_REGEX = 
%r/cid:([^"]*)/m

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.installed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libis/format/tool/msg_to_pdf.rb', line 29

def self.installed?
  File.exist?(Libis::Format::Config[:wkhtmltopdf])
end

.run(source, target, options = {}) ⇒ Object 



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# File 'lib/libis/format/tool/msg_to_pdf.rb', line 33

def self.run(source, target, options = {})
  new.run source, target, options
end

Instance Method Details

#msg_to_pdf(msg, target, target_format, pdf_options, root_msg: true) ⇒ Object 



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# File 'lib/libis/format/tool/msg_to_pdf.rb', line 58

def msg_to_pdf(msg, target, target_format, pdf_options, root_msg: true)

  # Make sure the target directory exists
  outdir = File.dirname(target)
  FileUtils.mkdir_p(outdir)

# puts "Headers:"
# puts '--------'
# pp msg.headers

# puts "Recipients:"
# puts '-----------'
# pp msg.recipients

# puts "Body:"
# puts '-----'
# puts msg.properties.body
# puts '-----'
# puts msg.properties.body_rtf
# puts '-----'
# puts msg.properties.body_html

# puts "Attachments:"
# puts '------------'
# msg.attachments.each {|a| p "#{a.filename} - #{a.properties.attach_content_id}"}

# puts "Converting:"
# puts '-----------'

  # Get the body of the message in HTML
  body = msg.properties.body_html
  body ||= begin
    # Embed plain body in HTML as a fallback
    HTML_WRAPPER_TEMPLATE % msg.properties.body
  end

  # Check and fix the character encoding
  begin
    # Try to encode into UTF-8
    body.encode!('UTF-8', universal_newline: true)
  rescue Encoding::InvalidByteSequenceError, Encoding::UndefinedConversionError
    begin
    # If it fails, the text may be in Windows' Latin1 (ISO-8859-1)
    body.force_encoding('ISO-8859-1').encode!('UTF-8', universal_newline: true)
    rescue Encoding::InvalidByteSequenceError, Encoding::UndefinedConversionError => e
      # If that fails too, log a warning and replace the invalid/unknown with a ? character.
      @warnings << "#{e.class}: #{e.message}"
      body.encode!('UTF-8', universal_newline: true, invalid: :replace, undef: :replace)
    end
  end

  # Process headers
  # ---------------
  headers = {}
  hdr_html = ''

  %w"From To Cc Subject Date".each do |key|
    value = find_hdr(msg.headers, key)
    if value
      headers[key.downcase.to_sym] = value
      hdr_html += hdr_html(key, value)
    end
  end

  [:date].each do |key|
    next unless headers[key]
    headers[key] = DateTime.parse(headers[key]).to_time.localtime.iso8601
  end

  # Add header section to the HTML body
  unless hdr_html.empty?
    # Insert header block styles
    if body =~ /<\/head>/
      # if head exists, append the style block
      body.gsub!(/<\/head>/, HEADER_STYLE + '</head>')
    else
      # otherwise insert a head section before the body tag
      body.gsub!(/<body/, '<head>' + HEADER_STYLE + '</head><body')
    end
    # Add the headers html table as first element in the body section
    body.gsub!(/<body[^>]*>/) {|m| "#{m}#{HEADER_TABLE_TEMPLATE % hdr_html}"}
  end

  # Embed inline images
  # -------------------
  attachments = msg.attachments
  used_files = []

  # First process plaintext cid entries
  body.gsub!(IMG_CID_PLAIN_REGEX) do |match|
# puts "CID found: #{match}, looking for #{$1}"
    data = getAttachmentData(attachments, $1)
    if data
# puts "cid #{$1} data: #{data.inspect}"
      used_files << $1
      "<img src=\"data:#{data[:mime_type]};base64,#{data[:base64]}\"/>"
    else
  # puts "cid #{$1} not found"
      '<img src=""/>'
    end
  end
  
  # Then process HTML img tags with CID entries
  body.gsub!(IMG_CID_HTML_REGEX) do |match|
# puts "CID found: #{match}, looking for #{$1}"
    data = getAttachmentData(attachments, $1)
    if  data
# puts "cid #{$1} data: #{data.inspect}"
    used_files << $1
    "data:#{data[:mime_type]};base64,#{data[:base64]}"
    else
# puts "cid #{$1} not found"
      ''
    end
  end

  # Create PDF
  # ----------
  files = []

  if target_format == :PDF
  # PDF creation options
    pdf_options = {
      page_size: 'A4',
      margin_top: '10mm',
      margin_bottom: '10mm',
      margin_left: '10mm',
      margin_right: '10mm',
      dpi: 300,
      # image_quality: 100,
      # viewport_size: '2480x3508',
    }.merge pdf_options

# pp pdf_options
# puts "Final HTML body:"
# pp body
    subject = find_hdr(msg.headers, 'Subject')
    kit = PDFKit.new(body, title: (subject || 'message'), **pdf_options)
    pdf = kit.to_pdf
    File.open(target, 'wb') {|f| f.write(pdf)}
# puts "message #{subject} converted to PDF file '#{target}'"
  else
    File.open(target, 'wb') {|f| f.write(body)}
# puts "message #{subject} converted to HTML file '#{target}'"
  end
  files << target if File.exist?(target)

  # Save attachments
  # ----------------
  outdir = File.join(outdir, "#{File.basename(target)}.attachments")
  digits = ((attachments.count + 1)/ 10) + 1
  i = 1
  attachments.delete_if {|a| a.properties.attachment_hidden}.each do |a|
    prefix = "#{"%0*d" % [digits, i]}-"
    if sub_msg = a.instance_variable_get(:@embedded_msg)
# puts "Embedded email message ..."
      subject = a.properties[:display_name] || sub_msg.subject || ""
      file = File.join(outdir, "#{prefix}#{subject}.msg.#{target_format.to_s.downcase}")

      result = msg_to_pdf(sub_msg, file, target_format, pdf_options, root_msg: false)
      if e = result[:error]
        raise 
      end
      files += result[:files]
    elsif a.filename
      next if used_files.include?(a.filename)
      file = File.join(outdir, "#{prefix}#{a.filename}")

      FileUtils.mkdir_p(File.dirname(file))
      File.open(file, 'wb') {|f| a.save(f)}
      files << file
# puts "Attachment file '#{file}' created"
    else
      @warnings << "Attachment #{a.properties[:display_name]} cannot be saved"
      next
    end
    i += 1
  end

  if root_msg
    p = Pathname(File.dirname(files.first))
    files[1..].each do |f|
      (headers[:attachments] ||= []) << Pathname.new(f).relative_path_from(p).to_s
    end
  end
  
  {
    command: {status: 0},
    files: files,
    headers: headers,
    warnings: @warnings
  }
  
rescue Exception => e
# puts "ERROR: Exception #{e.class} raised: #{e.message}"
# e.backtrace.each {|t| puts " - #{t}"}
  raise unless root_msg
  msg.close
  return {
    command: {status: -1},
    files: [],
    headers: {},
    errors: [
      {
        error: e.message,
        error_class: e.class.name,
        error_trace: e.backtrace,
      }
    ],
    warnings: @warnings
  }
end

#run(source, target, options = {}) ⇒ Object 



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# File 'lib/libis/format/tool/msg_to_pdf.rb', line 37

def run(source, target, options = {})
  # Preliminary checks
  # ------------------

  @warnings = []

  # Check if source file exists
  raise "File #{source} does not exist" unless File.exist?(source)

  # Retrieving the message
  # ----------------------

  # Open the message
  msg = Mapi::Msg.open(source)

  target_format = options.delete(:to_html) ? :HTML : :PDF
  result = msg_to_pdf(msg, target, target_format, options)
  msg.close
  result
end