Class: MPW::Server

Inherits:
Object
  • Object
show all
Defined in:
lib/mpw/server.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Server

Constructor



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# File 'lib/mpw/server.rb', line 17

def initialize
  YAML::ENGINE.yamler='syck'
end

Instance Attribute Details

#error_msg ⇒ Object

Returns the value of attribute error_msg.



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# File 'lib/mpw/server.rb', line 14

def error_msg
  @error_msg
end

Instance Method Details

#checkconfig(file_config) ⇒ Object

Check the config file @args: file_config -> the configuration file @rtrn: true if the config file is correct



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# File 'lib/mpw/server.rb', line 258

def checkconfig(file_config)
  config    = YAML::load_file(file_config)
  @host     = config['config']['host']
  @port     = config['config']['port'].to_i
  @data_dir = config['config']['data_dir']
  @log_file = config['config']['log_file']
  @timeout  = config['config']['timeout'].to_i

  if @host.empty? or @port <= 0 or @data_dir.empty? 
    puts I18n.t('checkconfig.fail')
    puts I18n.t('checkconfig.empty')
    return false
  end

  if not Dir.exist?(@data_dir)
    puts I18n.t('checkconfig.fail')
    puts I18n.t('checkconfig.datadir')
    return false
  end

  if @log_file.nil? or @log_file.empty?
    puts I18n.t('checkconfig.fail')
    puts I18n.t('checkconfig.log_file_empty')
    return false
  else
    begin
      @log = Logger.new(@log_file)
    rescue
      puts I18n.t('checkconfig.fail')
      puts I18n.t('checkconfig.log_file_create')
      return false
    end
  end

  return true
rescue Exception => e 
  puts "#{I18n.t('checkconfig.fail')}\n#{e}"
  return false
end

#close_connection(client) ⇒ Object

Close the client connection @args: client -> client connection



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# File 'lib/mpw/server.rb', line 250

def close_connection(client)
    client.puts "Closing the connection. Bye!"
    client.close
end

#delete_file(msg) ⇒ Object

Remove a gpg file @args: msg -> message puts by the client @rtrn: json message



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# File 'lib/mpw/server.rb', line 178

def delete_file(msg)
  gpg_key = msg['gpg_key'].sub('@', '_')

  if msg['suffix'].nil? or msg['suffix'].empty?
    file_gpg = "#{@data_dir}/#{gpg_key}.yml"
  else
    file_gpg = "#{@data_dir}/#{gpg_key}-#{msg['suffix']}.yml"
  end

  if not File.exist?(file_gpg)
    send_msg = {:action  => 'delete',
                :gpg_key => msg['gpg_key'],
                :error   => nil
               }

    return send_msg.to_json
  end

  gpg_data = YAML::load_file(file_gpg)
  salt     = gpg_data['gpg']['salt']
  hash     = gpg_data['gpg']['hash']

  if is_authorized?(msg['password'], salt, hash)
    begin
      File.unlink(file_gpg)

      send_msg = {action:  'delete',
                  gpg_key: msg['gpg_key'],
                  error:   nil
                 }
    rescue Exception => e
      send_msg = {action:  'delete',
                  gpg_key: msg['gpg_key'],
                  error:   'server.error.client.unknown'
                 }
    end
  else
    send_msg = {action:  'delete',
                gpg_key: msg['gpg_key'],
                error:   'server.error.client.no_authorized'
               }
  end
  
  return send_msg.to_json
end

#generate_salt(length = 4) ⇒ Object

Generate a random salt @args: length -> the length salt @rtrn: a random string



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# File 'lib/mpw/server.rb', line 331

def generate_salt(length=4)
  if length.to_i <= 0 or length.to_i > 16
    length = 4
  else
    length = length.to_i
  end

  return ([*('A'..'Z'),*('a'..'z'),*('0'..'9')]).sample(length).join
end

#get_client_msg(client) ⇒ Object

Get message to client @args: client -> client connection @rtrn: array of the json string, or false if isn’t json message



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# File 'lib/mpw/server.rb', line 240

def get_client_msg(client)
  msg = client.gets
  return JSON.parse(msg)
rescue
  closeConnection(client)
  return false
end

#get_file(msg) ⇒ Object

Get a gpg file @args: msg -> message puts by the client @rtrn: json message



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# File 'lib/mpw/server.rb', line 73

def get_file(msg)
  gpg_key = msg['gpg_key'].sub('@', '_')

  if msg['suffix'].nil? or msg['suffix'].empty?
    file_gpg = "#{@data_dir}/#{gpg_key}.yml"
  else
    file_gpg = "#{@data_dir}/#{gpg_key}-#{msg['suffix']}.yml"
  end

  if File.exist?(file_gpg)
    gpg_data    = YAML::load_file(file_gpg)
    salt        = gpg_data['gpg']['salt']
    hash        = gpg_data['gpg']['hash']
    data        = gpg_data['gpg']['data']

    if is_authorized?(msg['password'], salt, hash)
      send_msg = {action:  'get',
                  gpg_key: msg['gpg_key'],
                  data:    data,
                  error:   nil
                 }
    else
      send_msg = {action:  'get',
                  gpg_key: msg['gpg_key'],
                  error:   'server.error.client.no_authorized'
                 }
    end
  else
    send_msg = {action:  'get',
                gpg_key: msg['gpg_key'],
                data:    '',
                error:   nil
               }
  end

  return send_msg.to_json
end

#is_authorized?(password, salt, hash) ⇒ Boolean

Check is the hash equal the password with the salt @args: password -> the user password

salt -> the salt
hash -> the hash of the password with the salt

@rtrn: true is is good, else false

Returns:

  • (Boolean) 


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# File 'lib/mpw/server.rb', line 229

def is_authorized?(password, salt, hash)
  if hash == Digest::SHA256.hexdigest(salt + password)
    return true
  else
    return false
  end
end

#setup(file_config) ⇒ Object

Create a new config file @args: file_config -> the configuration file @rtrn: true if le config file is create



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# File 'lib/mpw/server.rb', line 301

def setup(file_config)
  puts I18n.t('form.setup.title')
  puts '--------------------'
  host     = ask(I18n.t('form.setup.host')).to_s
  port     = ask(I18n.t('form.setup.port')).to_s
  data_dir = ask(I18n.t('form.setup.data_dir')).to_s
  log_file = ask(I18n.t('form.setup.log_file')).to_s
  timeout  = ask(I18n.t('form.setup.timeout')).to_s

  config = {'config' => {'host'     => host,
                         'port'     => port,
                         'data_dir' => data_dir,
                         'log_file' => log_file,
                         'timeout'  => timeout
                        }
           }

  File.open(file_config, 'w') do |file|
    file << config.to_yaml
  end
    
  return true
rescue Exception => e 
  puts "#{I18n.t('form.setup.not_valid')}\n#{e}"
  return false
end

#start ⇒ Object

Start the server



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# File 'lib/mpw/server.rb', line 22

def start
  server = TCPServer.open(@host, @port)
  @log.info("The server is started on #{@host}:#{@port}")

  loop do
    Thread.start(server.accept) do |client|
      @log.info("#{client.peeraddr[3]} is connected")

      while true do
        msg = get_client_msg(client)

        next if not msg
        
        if msg['gpg_key'].nil? or msg['gpg_key'].empty? or msg['password'].nil? or msg['password'].empty?
          @log.warning("#{client.peeraddr[3]} is disconnected because no password or no gpg_key")
          close_connection(client)
          next
        end

        case msg['action']
        when 'get'
          @log.debug("#{client.peeraddr[3]} GET gpg_key=#{msg['gpg_key']} suffix=#{msg['suffix']}")
          client.puts get_file(msg)
        when 'update'
          @log.debug("#{client.peeraddr[3]} UPDATE gpg_key=#{msg['gpg_key']} suffix=#{msg['suffix']}")
          client.puts update_file(msg)
        when 'delete'
          @log.debug("#{client.peeraddr[3]} DELETE gpg_key=#{msg['gpg_key']} suffix=#{msg['suffix']}")
          client.puts delete_file(msg)
        else
          @log.warning("#{client.peeraddr[3]} is disconnected because unkwnow command")
          send_msg = {action: 'unknown',
                      gpg_key: msg['gpg_key'],
                      error:  'server.error.client.unknown'
                     }
          client.puts send_msg 
          close_connection(client)
        end
      end
    end
  end

rescue Exception => e
  puts "Impossible to start the server: #{e}"
  @log.error("Impossible to start the server: #{e}")
  exit 2
end

#update_file(msg) ⇒ Object

Update a file @args: msg -> message puts by the client @rtrn: json message



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# File 'lib/mpw/server.rb', line 114

def update_file(msg)
  gpg_key = msg['gpg_key'].sub('@', '_')
  data    = msg['data']

  if data.nil? or data.empty?
    send_msg = {action:  'update',
                gpg_key: msg['gpg_key'],
                error:   'server.error.client.no_data'
               }
    
    return send_msg.to_json
  end

  if msg['suffix'].nil? or msg['suffix'].empty?
    file_gpg = "#{@data_dir}/#{gpg_key}.yml"
  else
    file_gpg = "#{@data_dir}/#{gpg_key}-#{msg['suffix']}.yml"
  end

  if File.exist?(file_gpg)
    gpg_data  = YAML::load_file(file_gpg)
    salt      = gpg_data['gpg']['salt']
    hash      = gpg_data['gpg']['hash']

  else
    salt = generate_salt
    hash = Digest::SHA256.hexdigest(salt + msg['password'])
  end

  if is_authorized?(msg['password'], salt, hash)
    begin
      config = {'gpg' => {'salt' => salt,
                          'hash' => hash,
                          'data' => data
                         }
               }

      File.open(file_gpg, 'w+') do |file|
        file << config.to_yaml
      end

      send_msg = {action:  'update',
                  gpg_key: msg['gpg_key'],
                  error:   nil
                 }
    rescue Exception => e
      send_msg = {action:  'update',
                  gpg_key: msg['gpg_key'],
                  error:   'server.error.client.unknown'
                 }
    end
  else
    send_msg = {action:  'update',
                gpg_key: msg['gpg_key'],
                error:   'server.error.client.no_authorized'
               }
  end
  
  return send_msg.to_json
end