feat(parseStyleAttributes): add option to skip style parsing [fix 547]

[bertyhell]

This will fix #547

This PR introduces a new option:

options.parseStyleAttributes: boolean

By default set to true, to match the current behavior. But a user can set it to false, to skip parsing style tags.
This can avoid issues when the package is used in the browser.

  it('Should ignore styles when options.parseStyleAttributes is false', function() {
    assert.equal(
      sanitizeHtml('<span style=\'color: blue; text-align: justify\'></span>', {
        allowedTags: false,
        allowedAttributes: {
          span: [ 'style' ]
        },
        allowedStyles: {
          span: {
            color: [ /blue/ ],
            'text-align': [ /left/ ]
          }
        },
        parseStyleAttributes: false
      }), '<span style="color: blue; text-align: justify"></span>'
    );
  });

[boutell]

Thanks. Does allowedStyles still do anything when parseStyleAttributes is false? Is it misleading to suggest anything is done to sanitize styles in the presence of this setting?

[bertyhell]

@boutell Good point, i added some extra text in the readme to make the user aware of this:

When you disable the parsing of the style attribute, the allowedStyles option is automatically ignored, and all styles will be allowed.

[boutell]

Good stuff. I think we also should throw an error when allowedStyles is configured in the presence of this setting. Just to be safe.

[bertyhell]

@boutell fixed, when they are used together you get this error:

throw new Error('allowedStyles option cannot be used together with parseStyleAttributes: false.');

[bertyhell]

@boutell fixed

[boutell]

Thanks. We're down to README tweaks now...

[bertyhell]

@boutell fixed

[boutell]

Thanks!