Class StrictInlineContentSecurityPolicy is a simple helper which allows applications to
modify the Content-Security-Policy sent by Nextcloud. Per default only JavaScript,
stylesheets, images, fonts, media and connections from the same domain
(‘self’) are allowed.
Even if a value gets modified above defaults will still get appended. Please
notice that Nextcloud ships already with sensible defaults and those policies
should require no modification at all for most use-cases.
This is a temp helper class from the default ContentSecurityPolicy to allow slow
migration to a stricter CSP. This does not allow inline styles.