add conf:check rake task

lib/tasks/configuration.rake

@@ -0,0 +1,54 @@
+require 'net/http'
+require 'nokogiri'
+require 'digest/sha1'
+
+namespace :conf  do
+  desc "Check Configuration"
+  task :check => :environment do
+    ENV_VARIABLES = ['SECRET_KEY_BASE', 'BIGBLUEBUTTON_ENDPOINT', 'BIGBLUEBUTTON_SECRET']
+
+    # Initial check that variables are set
+    print "\nChecking environment"
+    ENV_VARIABLES.each do |var|
+      if ENV[var].blank?
+        failed("#{var} not set correctly")
+      end
+    end
+    passed
+
+    # Tries to establish a connection to the BBB server from Greenlight
+    print "Checking Connection"
+    test_request(ENV['BIGBLUEBUTTON_ENDPOINT'])
+    passed
+
+    # Tests the checksum on the getMeetings api call
+    print "Checking Secret"
+    checksum = Digest::SHA1.hexdigest("getMeetings#{ENV['BIGBLUEBUTTON_SECRET']}")
+    test_request("#{ENV['BIGBLUEBUTTON_ENDPOINT']}api/getMeetings?checksum=#{checksum}")
+    passed
+  end
+end
+
+# takes the full URL including the protocol
+def test_request(url)
+  begin
+    uri = URI(url)
+    res = Net::HTTP.get(uri)
+
+    doc = Nokogiri::XML(res)
+    if doc.css("returncode").text != "SUCCESS"
+      failed("Could not get a valid response from BigBlueButton server - #{res}")
+    end
+  rescue => exc
+    failed("Error connecting to BigBlueButton server - #{exc}")
+  end
+end
+
+def failed(msg)
+  print(": Failed\n#{msg}\n")
+  exit
+end
+
+def passed()
+  print(": Passed\n")
+end