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function main(Data)

   -- Parse login GET Request for username and password
   local request = net.http.parseRequest{data=Data}
   local name = request.get_params.name
   local pass = request.get_params.password

   local success = false

   -- validate username and password in KeyCloak
   -- if success, log 1 and list of assigned roles.
   success, roles = validateViaKeycloak(name, pass)

   if success then
      body = '1'
      for _, role in pairs(roles) do
         body = body .. '\r\n' .. role
      end
   else
      body = '0'
   end

   local Response = net.http.respond{
      body = body,
      entity_type = "text/plain"
   }

   iguana.logInfo('Returning "' .. body .. '" for: ' .. name)

end



-- Authenticate user with KeyCloak
function validateViaKeycloak(name, pass)
   local clientId = 'iguana'
   local tokenURL = 'http://localhost:8080/realms/master/protocol/openid-connect/token'

   local tokenRequest = net.http.post{
      url = tokenURL,
      headers = {['Content-Type']='application/x-www-form-urlencoded'},
      parameters = {
         ['grant_type'] = 'password',
         ['client_id']  = clientId,
         ['username']   = name,
         ['password']   = pass
      },
      live=true
   }

   local response = json.parse{data=tokenRequest}
   local token = response.access_token

   -- If query succeeds, returns a valid token with user details, nil otherwise.
   if token == nil then
      return false
   else
      return true, getRoles(name, token)
   end
end


function getRoles(name, token)
   -- split and decode jwt payload containing user roles
   local roles = {}
   local jwt = token:split('.')
   local payload = filter.base64.dec(jwt[2])
   local payloadDetails = json.parse(payload)
   local roles = payloadDetails.realm_access.roles

   return roles 
end