GRN-59: Implemented pagination on the API call (#370)

* Added the env variable and functionality to paginate the call to the bbbapi

* Update user.rb

app/models/room.rb

@@ -17,6 +17,8 @@
 # with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 
 class Room < ApplicationRecord
+  include ::APIConcern
+
   before_create :setup
 
   before_destroy :delete_all_recordings
@@ -118,21 +120,8 @@ class Room < ApplicationRecord
   # Fetches all recordings for a room.
   def recordings
     res = bbb.get_recordings(meetingID: bbb_id)
-    # Format playbacks in a more pleasant way.
-    res[:recordings].each do |r|
-      next if r.key?(:error)
-      r[:playbacks] = if !r[:playback] || !r[:playback][:format]
-        []
-      elsif r[:playback][:format].is_a?(Array)
-        r[:playback][:format]
-      else
-        [r[:playback][:format]]
-      end
 
-      r.delete(:playback)
-    end
-
-    res[:recordings].sort_by { |rec| rec[:endTime] }.reverse
+    format_recordings(res)
   end
 
   # Fetches a rooms public recordings.
@@ -152,24 +141,6 @@ class Room < ApplicationRecord
 
   private
 
-  def bbb_endpoint
-    Rails.configuration.bigbluebutton_endpoint
-  end
-
-  def bbb_secret
-    Rails.configuration.bigbluebutton_secret
-  end
-
-  # Sets a BigBlueButtonApi object for interacting with the API.
-  def bbb
-    @bbb ||= if Rails.configuration.loadbalanced_configuration
-      lb_user = retrieve_loadbalanced_credentials(owner.provider)
-      BigBlueButton::BigBlueButtonApi.new(remove_slash(lb_user["apiURL"]), lb_user["secret"], "0.8")
-    else
-      BigBlueButton::BigBlueButtonApi.new(remove_slash(bbb_endpoint), bbb_secret, "0.8")
-    end
-  end
-
   # Generates a uid for the room and BigBlueButton.
   def setup
     self.uid = random_room_uid
@@ -193,51 +164,6 @@ class Room < ApplicationRecord
     [owner.name_chunk, uid_chunk, uid_chunk].join('-').downcase
   end
 
-  # Rereives the loadbalanced BigBlueButton credentials for a user.
-  def retrieve_loadbalanced_credentials(provider)
-    # Include Omniauth accounts under the Greenlight provider.
-    provider = "greenlight" if Rails.configuration.providers.include?(provider.to_sym)
-
-    # Build the URI.
-    uri = encode_bbb_url(
-      Rails.configuration.loadbalancer_endpoint + "getUser",
-      Rails.configuration.loadbalancer_secret,
-      name: provider
-    )
-
-    # Make the request.
-    http = Net::HTTP.new(uri.host, uri.port)
-    http.use_ssl = (uri.scheme == 'https')
-    response = http.get(uri.request_uri)
-
-    unless response.is_a?(Net::HTTPSuccess)
-      raise "Error retrieving provider credentials: #{response.code} #{response.message}"
-    end
-
-    # Parse XML.
-    doc = XmlSimple.xml_in(response.body, 'ForceArray' => false)
-
-    # Return the user credentials if the request succeeded on the loadbalancer.
-    return doc['user'] if doc['returncode'] == RETURNCODE_SUCCESS
-
-    raise "User with provider #{provider} does not exist." if doc['messageKey'] == "noSuchUser"
-    raise "API call #{url} failed with #{doc['messageKey']}."
-  end
-
-  # Builds a request to retrieve credentials from the load balancer.
-  def encode_bbb_url(base_url, secret, params)
-    encoded_params = OAuth::Helper.normalize(params)
-    string = "getUser" + encoded_params + secret
-    checksum = OpenSSL::Digest.digest('sha1', string).unpack("H*").first
-
-    URI.parse("#{base_url}?#{encoded_params}&checksum=#{checksum}")
-  end
-
-  # Removes trailing forward slash from a URL.
-  def remove_slash(s)
-    s.nil? ? nil : s.chomp("/")
-  end
-
   # Generates a random password for a meeting.
   def random_password(length)
     charset = ("a".."z").to_a + ("A".."Z").to_a