discourse/lib/url_helper.rb

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# frozen_string_literal: true
class UrlHelper
# At the moment this handles invalid URLs that browser address bar accepts
# where second # is not encoded
#
# Longer term we can add support of simpleidn and encode unicode domains
def self.relaxed_parse(url)
url, fragment = url.split("#", 2)
uri = URI.parse(url)
if uri
fragment = URI.escape(fragment) if fragment&.include?('#')
uri.fragment = fragment
uri
end
rescue URI::Error
end
def self.is_local(url)
url.present? && (
Discourse.store.has_been_uploaded?(url) ||
!!(url =~ Regexp.new("^#{Discourse.base_uri}/(assets|plugins|images)/")) ||
url.start_with?(Discourse.asset_host || Discourse.base_url_no_prefix)
)
end
def self.absolute(url, cdn = Discourse.asset_host)
cdn = "https:#{cdn}" if cdn && cdn =~ /^\/\//
url =~ /^\/[^\/]/ ? (cdn || Discourse.base_url_no_prefix) + url : url
end
def self.absolute_without_cdn(url)
self.absolute(url, nil)
end
def self.schemaless(url)
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url.sub(/^http:/i, "")
end
DOUBLE_ESCAPED_REGEXP ||= /%25([0-9a-f]{2})/i
# Prevents double URL encode
# https://stackoverflow.com/a/37599235
def self.escape_uri(uri, pattern = URI::UNSAFE)
encoded = URI.encode(uri, pattern)
encoded.gsub!(DOUBLE_ESCAPED_REGEXP, '%\1')
encoded
end
def self.cook_url(url)
return url unless is_local(url)
uri = URI.parse(url)
filename = File.basename(uri.path)
is_attachment = !FileHelper.is_supported_image?(filename)
no_cdn = SiteSetting.login_required || SiteSetting.prevent_anons_from_downloading_files
url = absolute_without_cdn(url)
unless is_attachment && no_cdn
url = Discourse.store.cdn_url(url)
url = local_cdn_url(url) if Discourse.store.external?
end
schemaless(url)
rescue URI::Error
url
end
def self.local_cdn_url(url)
return url if Discourse.asset_host.blank?
url.sub(Discourse.base_url_no_prefix, Discourse.asset_host)
end
end