Move JavaScript `sanitizeText` and `stripTags` functions from press-this to core

[adamsilverstein]

The file press-this.js includes two generally useful helper functions:

• stripTags strips HTML tags from a string using a series of regex replace calls.
• sanitizeText strips HTML tags and converts HTML entities in a string. It leverages a textarea's content to encode HTML and returns a string that is safe to evaluate.

These functions would be generally useful in core and for plugin and theme developers and could be added to the wp namespace, eg wp.utils.stripTags and wp.utils.sanitizeText

[adamsilverstein]

40635.diff​ moves the sanitizeText and stripTags functions from wp-admin/js/press-this.js to wp-includes/js/utils.js and namespaces them as wp.utils.sanitizeText and wp.utils.stripTags.

Some unit tests for these helpers would be a great addition, if we have them I couldn't find them.

[afercia]

+1 for wp.utils.

[adamsilverstein]

in 40635.2.diff​

• separate out functionality into its own file, wp-sanitize.js
• use a separate namespace as suggested in chat - wp.sanitize

[adamsilverstein]

In 41061:

Move sanitizeText and stripTags from press this to wp.sanitize.

Introduce the wp.sanitize namespace and add two helpers for text sanitization. stripTags strips HTML tags from a string using regex.

Fixes #40635.

[ocean90]

wp.sanitize.sanitizeText() looks weird since it's repetitive. What about wp.sanitize.text()?

[adamsilverstein]

Replying to ocean90:

wp.sanitize.sanitizeText() looks weird since it's repetitive. What about wp.sanitize.text()?

@ocean90 What do you think of something more descriptive here like wp.sanitize.stripTagsAndEncode? This function strips tags from a string and also encodes any HTML entities.

cc: @kraftbj if we change the function name, the Press This plugin will ​need an update.

[adamsilverstein]

In 41745:

Security: Rename new wp.sanitize.sanitizeText to stripTagsAndEncodeText.'

Improve function naming: this function strips tags from a string and also encodes any HTML entities.

Props ocean90.

Fixes #40635.