CODEWITHSUNDEEP
regexfirebasefirebase-securityfirebase-realtime-database
Vincent den Boer
Vincent den Boer

Reputation: 77

Validating slugs in Firebase security rules

I'd like to validate whether inserted slugs are what they should be and have the following function in Bolt:

slugify(s) = s.toLowerCase().replace(/[^\w ]+/g,'').replace(/ +/g,'-')

used like:

validate() = $slug == slugify($this.title)

However, the g regex modifier doesn't seem to be supported. Are there any other ways / best practices to achieve my goal?

Upvotes: 1

Views: 416

Answers (1)

mckoss
mckoss

Reputation: 7034

About the best you can do with the allowed string operators is to ensure that your string looks like a slug.

type Slug extends String {
  validate() = this.test(/^([a-z0-9]+-)+[a-z0-9]+$/);
}

Here are some tests against this pattern:

  .write('this-is-a-slug')
  .succeeds("Typical slug text.")

  .write('numbers-2016-ok')
  .succeeds("Numbers are ok.")

  .write('double--hyphen')
  .fails("Double hyphen not ok.")

  .write('-leading-hyphen')
  .fails("Leading hyphen not ok.")

  .write('trailing-hyphen-')
  .fails("Trailing hyphen not ok.")

  .write('nohyphen')
  .fails("Must have at least one hyphen.")

  .write('no-Upper')
  .fails("No upper case.")

  .write('no-special&-char')
  .fails("No special characters.")

  .write('no spaces')
  .fails("No spaces allowed.")

You can find more RegExp examples here

Upvotes: 3

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