Add a function to compare BBB version numbers

This can be used to check if e.g. recording is from a 0.9.0 or newer server

record-and-playback/core/lib/recordandplayback/generators/events.rb

@@ -450,5 +450,52 @@ module BigBlueButton
       recording['bbb_version']      
     end
 
+    # Compare version numbers
+    # Returns true if version is newer than requested version
+    def self.bbb_version_compare(events_xml, major, minor=nil, micro=nil)
+      bbb_version = self.bbb_version(events_xml)
+      if bbb_version.nil?
+        # BigBlueButton 0.81 or earler
+        return false
+      end
+
+      # Split the version string
+      match = /^(\d+)\.(\d+)\.(\d+)/.match(bbb_version)
+      if !match
+        raise "bbb_version #{bbb_version} is not in the correct format"
+      end
+
+      # Check major version mismatch
+      if match[1].to_i > major
+        return true
+      end
+      if match[1].to_i < major
+        return false
+      end
+
+      # Check minor version mismatch
+      if minor.nil?
+        return true
+      else
+        if match[2].to_i > minor
+          return true
+        end
+        if match[2].to_i < minor
+          return false
+        end
+      end
+
+      # Check micro version mismatch
+      if micro.nil?
+        return true
+      else
+        if match[3].to_i >= micro
+          return true
+        else
+          return false
+        end
+      end
+    end
+
   end
 end