Extracting Basic Auth token

nginx_basicauth.lua

--[[
  Authorization logic
]]--

function get_auth_params(where, method)
 local params = {}
 if where == "headers" then
    params = ngx.req.get_headers()
    
 elseif where == "basicauth" then
  params = ngx.req.get_headers()
  if params["Authorization"] then
    local m = ngx.re.match(params["Authorization"], "Basic\\s(.+)")
    if m then
      params.user_key = m[1]
    end
  end

 elseif method == "GET" then
    params = ngx.req.get_uri_args()
 else
    ngx.req.read_body()
    params = ngx.req.get_post_args()
 end
 return first_values(params)
end