Extract keychain fun

lib/boxen/keychain.rb

@@ -0,0 +1,61 @@
+require "shellwords"
+
+module Boxen
+  class Keychain
+
+    # The keychain proxy we use to provide isolation and a friendly
+    # message in security prompts.
+
+    HELPER = File.expand_path "../../../script/Boxen", __FILE__
+
+    # The service name to use when loading/saving passwords.
+
+    PASSWORD_SERVICE = "GitHub Password"
+
+    # The service name to use when loading/saving API keys.
+
+    TOKEN_SERVICE = "GitHub API Token"
+
+    def initialize(login)
+      @login = login
+    end
+
+    def password
+      get PASSWORD_SERVICE
+    end
+
+    def password=(password)
+      set PASSWORD_SERVICE, password
+    end
+
+    def token
+      get TOKEN_SERVICE
+    end
+
+    def token=(token)
+      set TOKEN_SERVICE, token
+    end
+
+    protected
+
+    attr_reader :login
+
+    def get(service)
+      raw = [HELPER, service, login]
+      cmd = raw.map { |s| Shellwords.shellescape s }.join " "
+
+      result = `#{cmd}`.strip
+      $?.success? ? result : nil
+    end
+
+    def set(service, password)
+      cmd = [HELPER, service, login, password]
+
+      unless system *cmd
+        raise Boxen::Error, "Can't save #{service} in the keychain."
+      end
+
+      password
+    end
+  end
+end