fixes theforeman#141 - add support to extlookup kind of queries throu…

…gh foreman

usage:
wget -q  -O - "http://foreman/lookup?key=ntpserver&order[]=my.domain&order[]=common"
if you want it in YAML, just add:
wget -q  -O - "http://foreman/lookup?key=ntpserver&order[]=my.domain&order[]=common&format=yml"

app/controllers/hosts_controller.rb

@@ -1,6 +1,6 @@
 class HostsController < ApplicationController
-  before_filter :require_login, :except => [ :query, :externalNodes ]
-  before_filter :require_ssl, :except => [ :query, :externalNodes ]
+  before_filter :require_login, :except => [ :query, :externalNodes, :lookup ]
+  before_filter :require_ssl, :except => [ :query, :externalNodes, :lookup ]
   before_filter :find_hosts, :only => :query
 
   helper :hosts
@@ -108,6 +108,18 @@ def facts
     @host = Host.find(params[:id])
   end
 
+  # query action providing variable names - e.g. for extlookup
+  def lookup
+    key, order = params[:key], params[:order]
+    invalid_request if key.nil? or order.nil? or not order.is_a?(Array)
+    output = Lookup.search(key, order)
+    render :text => '404 Not Found', :status => 404 and return unless output
+    respond_to do |format|
+        format.html { render :text => output }
+        format.yml { render :text => output.to_yaml }
+    end
+  end
+
   private
   def find_hosts
     fact, klass = params[:fact], params[:class]

app/models/lookup.rb

@@ -0,0 +1,14 @@
+class Lookup < ActiveRecord::Base
+  validates_uniqueness_of :key, :scope => :priority
+  validates_presence_of :key, :value, :priority
+
+  def self.search(key, order = [])
+    order.each do |prio|
+      v = find(:first, :conditions => {:key => key, :priority => prio})
+      return v.value if v
+    end
+    # nothing was found
+    return false
+  end
+
+end

config/routes.rb

@@ -6,6 +6,7 @@
   map.connect "node/:name", :controller => 'hosts', :action => 'externalNodes',
     :requirements => { :name => /[^\.][\w\.-]+/ }
   map.connect "/hosts/query", :controller => 'hosts', :action => 'query'
+  map.connect "/lookup", :controller => 'hosts', :action => 'lookup'
   map.resources :hosts,
                 :member => {:report => :get, :reports => :get, :facts => :get},
                 :collection => { :show_search => :get},

db/migrate/20091219115148_create_lookups.rb

@@ -0,0 +1,19 @@
+class CreateLookups < ActiveRecord::Migration
+  def self.up
+    create_table :lookups do |t|
+      t.string :key
+      t.string :value
+      t.string :priority
+
+      t.timestamps
+    end
+    add_index "lookups", "priority"
+    add_index "lookups", "key"
+  end
+
+  def self.down
+    remove_index "lookups", "priority"
+    remove_index "lookups", "key"
+    drop_table :lookups
+  end
+end

test/fixtures/lookups.yml

@@ -0,0 +1,11 @@
+# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
+
+one:
+  key: MyString
+  value: MyString
+  priority: MyString
+
+two:
+  key: MyString
+  value: MyString
+  priority: MyString

test/unit/lookup_test.rb

@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class LookupTest < ActiveSupport::TestCase
+  # Replace this with your real tests.
+  test "the truth" do
+    assert true
+  end
+end