discourse/lib/validators/max_emojis_validator.rb

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class MaxEmojisValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
unescaped_title = PrettyText.unescape_emoji(Emoji.unicode_unescape(CGI::escapeHTML(value)))
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if unescaped_title.present? && unescaped_title.scan(/<img.+?class\s*=\s*'(emoji|emoji emoji-custom)'/).size > SiteSetting.max_emojis_in_title
record.errors.add(
attribute, SiteSetting.max_emojis_in_title > 0 ? :max_emojis : :emojis_disabled,
max_emojis_count: SiteSetting.max_emojis_in_title
)
end
end
end