sanitized authentication

src/sales_backend.cr

@@ -66,8 +66,7 @@ post "/logout" do |context|
 end
 
 post "/logout-all" do |context|
-    authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
-    user = User.from_json context.request.body.not_nil!
+    user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
     user_file = User.from_json File.read(Statics.data_path+"user/"+user.email)
     user_file.tokens=Array(UUID).new
     File.write(Statics.data_path+"user/"+user_file.email,user_file.to_json)