Refactor login/logout into sessions controller

Certain controller methods are shared with oauth-based logins, and these have been
moved to a concern.

app/controllers/concerns/session_methods.rb

@@ -0,0 +1,98 @@
+module SessionMethods
+  extend ActiveSupport::Concern
+
+  private
+
+  ##
+  # return the URL to use for authentication
+  def auth_url(provider, uid, referer = nil)
+    params = { :provider => provider }
+
+    params[:openid_url] = openid_expand_url(uid) if provider == "openid"
+
+    if referer.nil?
+      params[:origin] = request.path
+    else
+      params[:origin] = "#{request.path}?referer=#{CGI.escape(referer)}"
+      params[:referer] = referer
+    end
+
+    auth_path(params)
+  end
+
+  ##
+  # special case some common OpenID providers by applying heuristics to
+  # try and come up with the correct URL based on what the user entered
+  def openid_expand_url(openid_url)
+    if openid_url.nil?
+      nil
+    elsif openid_url.match(%r{(.*)gmail.com(/?)$}) || openid_url.match(%r{(.*)googlemail.com(/?)$})
+      # Special case gmail.com as it is potentially a popular OpenID
+      # provider and, unlike yahoo.com, where it works automatically, Google
+      # have hidden their OpenID endpoint somewhere obscure this making it
+      # somewhat less user friendly.
+      "https://www.google.com/accounts/o8/id"
+    else
+      openid_url
+    end
+  end
+
+  ##
+  # process a successful login
+  def successful_login(user, referer = nil)
+    session[:user] = user.id
+    session[:fingerprint] = user.fingerprint
+    session_expires_after 28.days if session[:remember_me]
+
+    target = referer || session[:referer] || url_for(:controller => :site, :action => :index)
+
+    # The user is logged in, so decide where to send them:
+    #
+    # - If they haven't seen the contributor terms, send them there.
+    # - If they have a block on them, show them that.
+    # - If they were referred to the login, send them back there.
+    # - Otherwise, send them to the home page.
+    if !user.terms_seen
+      redirect_to :controller => :users, :action => :terms, :referer => target
+    elsif user.blocked_on_view
+      redirect_to user.blocked_on_view, :referer => target
+    else
+      redirect_to target
+    end
+
+    session.delete(:remember_me)
+    session.delete(:referer)
+  end
+
+  ##
+  # process a failed login
+  def failed_login(message, username = nil)
+    flash[:error] = message
+
+    redirect_to :action => "new", :referer => session[:referer],
+                :username => username, :remember_me => session[:remember_me]
+
+    session.delete(:remember_me)
+    session.delete(:referer)
+  end
+
+  ##
+  #
+  def unconfirmed_login(user)
+    session[:token] = user.tokens.create.token
+
+    redirect_to :controller => "users", :action => "confirm", :display_name => user.display_name
+
+    session.delete(:remember_me)
+    session.delete(:referer)
+  end
+
+  ##
+  #
+  def disable_terms_redirect
+    # this is necessary otherwise going to the user terms page, when
+    # having not agreed already would cause an infinite redirect loop.
+    # it's .now so that this doesn't propagate to other pages.
+    flash.now[:skip_terms] = true
+  end
+end