First stab at some structure for messages and config

iris.rb

@@ -0,0 +1,70 @@
+#!/usr/bin/env ruby
+
+#TODO: Validate author with file owner
+
+require 'time'
+require 'base64'
+require 'digest'
+require 'socket'
+require 'json'
+
+class Config
+  CONFIG_FILE  = self.get[:config_file]  || "#{ENV['HOME']}/.iris.config.json"
+  MESSAGE_FILE = self.get[:message_file] || "#{ENV['HOME']}/.iris.messages"
+
+  USER         = ENV['USER'] || ENV['LOGNAME'] || ENV['USERNAME']
+  HOSTNAME     = self.get[:hostname] || Socket.gethostname
+  AUTHOR       = "#{USER}@#{HOSTNAME}"
+
+  def self.get(filepath = CONFIG_FILE)
+    return @loaded_config if @loaded_config
+    if !File.exists?(filepath)
+      File.write(filepath, '{}')
+      return @loaded_config = {}
+    end
+    return @loaded_config = JSON.load(filepath)
+  end
+end
+
+class Message
+  TERMINATOR = "\n.\n"
+  FIELD_SEPARATOR = '|'
+  FILE_FORMAT = 'v1'
+
+  attr_reader :timestamp, :hash, :edit_hash, :author, :parent, :message
+
+  def initialize(message, author = Config::AUTHOR, parent = nil, timestamp = Time.now.utc.iso8601, edit_hash = nil)
+    @parent    = parent
+    @author    = author
+    @timestamp = timestamp
+    @message   = message
+  end
+
+  def self.load(payload)
+    payload = payload.gsub(/#{TERMINATOR}$/, '')
+    hash, edit_hash, timestamp, parent, author, *message = payload.split(FIELD_SEPARATOR)
+
+    loaded_message = self.new(message.join(FIELD_SEPARATOR), author, parent, timestamp, edit_hash)
+    raise 'Broken hash!' unless loaded_message.hash == hash
+    loaded_message
+  end
+
+  def hash
+    make_sha(unconfirmed_payload)
+  end
+
+  def to_payload
+    [hash, @edit_hash, unconfirmed_payload].join(FIELD_SEPARATOR) + TERMINATOR
+  end
+
+  private
+
+  def unconfirmed_payload
+    [@timestamp, @parent, @author, @message].join(FIELD_SEPARATOR)
+  end
+
+  def make_sha(payload)
+    Base64.encode64(Digest::SHA1.digest(payload))
+  end
+end
+