authentication @ cocoon

Good evening together, 
I currently use the stream generator for XML files via HTTP post to cocoon.
Now I would like to introduce an authentication. 

My current pipeline: 
         <map:pipeline> 
             <map:match pattern="get"> 
                 <map:generate type="stream"> 
                     <map:parameter name="form-name" value="file"/> 
                 </ map: generate> 
                 <map:transform src="convert.xsl" /> 
                 <map:serialize type="html"/> 
             </ map: match> 
         </ map: pipeline> 

Is there an easy way to implement this? Furthermore, I ask myself currently,
for which the form-name is required? Via REST I can also send data
successfully without the form to specify? 

Greetings