Add default random password on user create.

  Allows validation to pass for creating user by email.
Append @umich.edu to uniquename passed in from cosign.

app/models/user.rb

@@ -7,6 +7,12 @@ class User < ActiveRecord::Base
   include Sufia::User
   include Sufia::UserUsageStats
 
+  before_validation :generate_password, :on => :create
+
+  def generate_password
+    self.password = SecureRandom.urlsafe_base64(12)
+  end
+
   # Use the http header as auth.  This app will be behind a reverse proxy
   #   that will take care of the authentication.
   Devise.add_module(:http_header_authenticatable,

lib/devise/behaviors/http_header_authenticatable_behavior.rb

@@ -10,9 +10,10 @@ def valid_user?(headers)
 
     protected
 
+    # Remote user is coming back from cosign as uniquename.
+    # Append @umich.edu to this value to satisfy user model validations
     def remote_user(headers)
-      return headers['HTTP_X_REMOTE_USER'] if headers['HTTP_X_REMOTE_USER']
-      return headers['HTTP_REMOTE_USER'] if headers['HTTP_REMOTE_USER'] && Rails.env.development?
+      return "#{headers['HTTP_X_REMOTE_USER']}@umich.edu" if headers['HTTP_X_REMOTE_USER']
       return nil
     end