1 files changed, 67 insertions, 0 deletions
diff --git a/lib/local_email.rb b/lib/local_email.rb
new file mode 100644
index 0000000..7c592e1
--- /dev/null
+++ b/lib/local_email.rb
@@ -0,0 +1,67 @@
+require 'email'
+class LocalEmail < Email
+
+  BLACKLIST_FROM_RFC2142 = [
+    'postmaster', 'hostmaster', 'domainadmin', 'webmaster', 'www',
+    'abuse', 'noc', 'security', 'usenet', 'news', 'uucp',
+    'ftp', 'sales', 'marketing', 'support', 'info'
+  ]
+
+  def self.domain
+    APP_CONFIG[:domain]
+  end
+
+  validates :email,
+    :format => {
+      :with => /@#{domain}\Z/i,
+      :message => "needs to end in @#{domain}"
+    }
+
+  validate :handle_allowed
+
+  def initialize(s)
+    super
+    append_domain_if_needed
+  end
+
+  def to_key
+    [handle]
+  end
+
+  def domain
+    LocalEmail.domain
+  end
+
+  protected
+
+  def append_domain_if_needed
+    unless self.index('@')
+      self << '@' + domain
+    end
+  end
+
+  def handle_allowed
+    errors.add(:handle, "is reserved.") if handle_reserved?
+  end
+
+  def handle_reserved?
+    # *ARRAY in a case statement tests if ARRAY includes the handle.
+    case handle
+    when *APP_CONFIG[:handle_blacklist]
+      true
+    when *APP_CONFIG[:handle_whitelist]
+      false
+    when *BLACKLIST_FROM_RFC2142
+      true
+    else
+      handle_in_passwd?
+    end
+  end
+
+  def handle_in_passwd?
+    Etc.getpwnam(handle).present?
+  rescue ArgumentError
+    # handle was not found
+    return false
+  end
+end