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Filename : mimemessage.rb
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# SOAP4R - MIME Message implementation.
# Copyright (C) 2002  Jamie Herre.

# This program is copyrighted free software by NAKAMURA, Hiroshi.  You can
# redistribute it and/or modify it under the same terms of Ruby's license;
# either the dual license version in 2003, or any later version.


require 'soap/attachment'


module SOAP


# Classes for MIME message handling.  Should be put somewhere else!
# Tried using the 'tmail' module but found that I needed something
# lighter in weight.


class MIMEMessage
  class MIMEMessageError < StandardError; end

  MultipartContentType = 'multipart/\w+'

  class Header
    attr_accessor :str, :key, :root

    def initialize
      @attrs = {}
    end

    def [](key)
      @attrs[key]
    end

    def []=(key, value)
      @attrs[key] = value
    end

    def to_s
      @key + ": " + @str
    end
  end

  class Headers < Hash
    def self.parse(str)
      new.parse(str)
    end

    def parse(str)
      header_cache = nil
      str.each do |line|
	case line
	when /^\A[^\: \t]+:\s*.+$/
	  parse_line(header_cache) if header_cache
	  header_cache = line.sub(/\r?\n\z/, '')
	when /^\A\s+(.*)$/
	  # a continuous line at the beginning line crashes here.
	  header_cache << line
	else
	  raise RuntimeError.new("unexpected header: #{line.inspect}")
	end
      end
      parse_line(header_cache) if header_cache
      self
    end

    def parse_line(line)
      if /^\A([^\: \t]+):\s*(.+)\z/ =~ line
    	header = parse_rhs($2.strip)
	header.key = $1.strip
	self[header.key.downcase] = header
      else
	raise RuntimeError.new("unexpected header line: #{line.inspect}")
      end
    end

    def parse_rhs(str)
      a = str.split(/;+\s+/)
      header = Header.new
      header.str = str
      header.root = a.shift
      a.each do |pair|
	if pair =~ /(\w+)\s*=\s*"?([^"]+)"?/
	  header[$1.downcase] = $2
	else
	  raise RuntimeError.new("unexpected header component: #{pair.inspect}")
	end
      end
      header
    end

    def add(key, value)
      if key != nil and value != nil
	header = parse_rhs(value)
	header.key = key
	self[key.downcase] = header
      end
    end

    def to_s
      self.values.collect { |hdr|
	hdr.to_s
      }.join("\r\n")
    end
  end

  class Part
    attr_accessor :headers, :body

    def initialize
      @headers = Headers.new
      @headers.add("Content-Transfer-Encoding", "8bit")
      @body = nil
      @contentid = nil
    end

    def self.parse(str)
      new.parse(str)
    end

    def parse(str)
      headers, body = str.split(/\r\n\r\n/s)
      if headers != nil and body != nil
	@headers = Headers.parse(headers)
	@body = body.sub(/\r\n\z/, '')
      else
	raise RuntimeError.new("unexpected part: #{str.inspect}")
      end
      self
    end

    def contentid
      if @contentid == nil and @headers.key?('content-id')
	@contentid = @headers['content-id'].str
	@contentid = $1 if @contentid =~ /^<(.+)>$/
      end
      @contentid
    end

    alias content body

    def to_s
      @headers.to_s + "\r\n\r\n" + @body
    end
  end

  def initialize
    @parts = []
    @headers = Headers.new
    @root = nil
  end

  def self.parse(head, str)
    new.parse(head, str)
  end

  attr_reader :parts, :headers

  def close
    @headers.add(
      "Content-Type",
      "multipart/related; type=\"text/xml\"; boundary=\"#{boundary}\"; start=\"#{@parts[0].contentid}\""
    )
  end

  def parse(head, str)
    @headers = Headers.parse(head + "\r\n" + "From: jfh\r\n")
    boundary = @headers['content-type']['boundary']
    if boundary != nil
      parts = str.split(/--#{Regexp.quote(boundary)}\s*(?:\r\n|--\r\n)/)
      part = parts.shift	# preamble must be ignored.
      @parts = parts.collect { |part| Part.parse(part) }
    else
      @parts = [Part.parse(str)]
    end
    if @parts.length < 1
      raise MIMEMessageError.new("This message contains no valid parts!")
    end
    self
  end

  def root
    if @root == nil
      start = @headers['content-type']['start']
      @root = (start && @parts.find { |prt| prt.contentid == start }) ||
	@parts[0]
    end
    @root
  end

  def boundary
    if @boundary == nil
      @boundary = "----=Part_" + __id__.to_s + rand.to_s
    end
    @boundary
  end

  def add_part(content)
    part = Part.new
    part.headers.add("Content-Type",
      "text/xml; charset=" + XSD::Charset.xml_encoding_label)
    part.headers.add("Content-ID", Attachment.contentid(part))
    part.body = content
    @parts.unshift(part)
  end

  def add_attachment(attach)
    part = Part.new
    part.headers.add("Content-Type", attach.contenttype)
    part.headers.add("Content-ID", attach.mime_contentid)
    part.body = attach.content
    @parts.unshift(part)
  end

  def has_parts?
    (@parts.length > 0)
  end

  def headers_str
    @headers.to_s
  end

  def content_str
    str = ''
    @parts.each do |prt|
      str << "--" + boundary + "\r\n"
      str << prt.to_s + "\r\n"
    end
    str << '--' + boundary + "--\r\n"
    str
  end

  def to_s
    str = headers_str + "\r\n\r\n" + content_str
  end
end


end