Gemfile

# A sample Gemfile
source "https://rubygems.org"

gem 'atomutil', :github => 'henteko/ruby-atomutil'

tumblr_mv_hatena_blog.rb

#!/usr/local/bin/ruby
# -*- encoding: utf-8 -*-

require 'json'
require 'find'
require 'atomutil'

class Tumblr
  attr_reader :title, :date, :body

  def initialize(title, date, body)
    @title = title
    @date = Time.parse(date).utc.iso8601
    @body = body
  end

  def self.read(file_path)
    title = ''
    date = ''
    body = ''
    conf_flag = false
    blank_flag = false
    blank_count = 0
    File.open(file_path) do |file|
      file.each_line do |labmen|
        if md = labmen.match(/^raw: (.*)/)
          json = md[1]
          hash = JSON.parse(json)
          title = hash["title"]
          date = hash["date"]
        end
        body += labmen if blank_flag

        # タイトル部分を本文から除外する(改行含めて5行ある)
        if conf_flag && !blank_flag
          blank_count += 1
          blank_flag = true if blank_count >= 5
        end
        # -->から上は除外する
        conf_flag = true if labmen.match(/^-->/)
      end
    end
    Tumblr.new(title, date, body)
  end

  def self.export_files
    base_path = '/path/to/tumblr_export_dir'
    results = []
    Find.find(base_path) do |path|
      next if path == base_path
      if File.extname(path) == '.md'
        results.push(path)
      end
    end
    results
  end
end

class HatenaBlog
  def initialize(user_name, blog, password)
    @user_name = user_name
    @blog = blog
    @password = password
    @url = "http://blog.hatena.ne.jp/#{@user_name}/#{@blog}/atom/entry"
    auth = Atompub::Auth::Wsse.new(
        :username => @user_name,
        :password => @password
    )
    @client = Atompub::Client.new(:auth => auth)
  end

  def upload(title, date, content)
    entry = Atom::Entry.new(
        :title => title,
        :updated => date.to_s,
        :content => content)
    @client.create_entry(@url, entry)
  end
end

hatena = HatenaBlog.new('hatena_user_naem', 'blog_domain', 'password')
Tumblr.export_files.each do |file_path|
  tumblr = Tumblr.read(file_path)
  p hatena.upload(tumblr.title, tumblr.date, tumblr.body)
end