hot-line/src/services/validation.lisp

(defpackage #:validation
  (:use #:cl)
  (:export
   #:clean-filename
   #:string-is-nil-or-empty-p
   #:separate-files-in-web-request))
(in-package #:validation)

(defun validation-test ()
  (format t "~&[INFO] Validation package reached."))

(defun request-params (request)
  (loop :for (key . value) :in request
	:collect (let ((*package* (find-package :keyword)))
		   (read-from-string key))
	:collect value))

(defun string-is-nil-or-empty-p (string-to-test)
  "Tests to see if `STRING-TO-TEST' is empty of just whitespace.
This is essentially the 'IsNullOrWhiteSpace' function I use in C#. It
expands the 'empty string' check to include a check to see if there is
string with just a '(white) space' in it."
  (if (or (string= string-to-test " ")
	  (zerop (length string-to-test))
	  (null  string-to-test))
      t
      nil))

(defun separate-files-in-web-request (request &optional request-value)
  "Creates a new list of 'upload' files from a web `REQUEST'.
You will mostly use this for processing a multi-file upload (HTML)
form. The standard value for the 'name' attribute in (file) input tag
in the HTML form is `CONTENT-FILES' but you can use a different
name. Just specify it in this function's `REQUEST-VALUE' argument."
     (loop :for item :in request
       if (or (string= "CONTENT-FILES" (car item))
	       (string= request-value (car item)))
		  collect item))

(defun clean-filename (filename)
  "Basically, slugifies it, removes whitespace, trims it Etc."
  (let* ((lowercased (string-downcase filename))
	 (trimmed (string-trim '(#\Space #\Tab) lowercased))
	 (whitespaced (substitute #\- #\Space trimmed)))
  whitespaced))