mirror of
https://github.com/discourse/discourse.git
synced 2024-12-11 22:15:47 +08:00
171 lines
5.0 KiB
Ruby
171 lines
5.0 KiB
Ruby
# frozen_string_literal: true
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class UrlHelper
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# At the moment this handles invalid URLs that browser address bar accepts
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# where second # is not encoded
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#
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# Longer term we can add support of simpleidn and encode unicode domains
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def self.relaxed_parse(url)
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url, fragment = url.split("#", 2)
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uri = URI.parse(url)
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if uri
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# Addressable::URI::CharacterClasses::UNRESERVED is used here because without it
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# the # in the fragment is not encoded
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fragment =
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Addressable::URI.encode_component(
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fragment,
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Addressable::URI::CharacterClasses::UNRESERVED,
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) if fragment&.include?("#")
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uri.fragment = fragment
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uri
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end
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rescue URI::Error
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end
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def self.encode_and_parse(url)
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URI.parse(Addressable::URI.encode(url))
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end
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def self.encode(url)
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Addressable::URI.encode(url)
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end
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def self.unencode(url)
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Addressable::URI.unencode(url)
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end
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def self.encode_component(url_component)
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Addressable::URI.encode_component(url_component)
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end
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def self.is_local(url)
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url.present? &&
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(
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Discourse.store.has_been_uploaded?(url) ||
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!!(url =~ Regexp.new("^#{Discourse.base_path}/(assets|plugins|images)/")) ||
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url.start_with?(Discourse.asset_host || Discourse.base_url_no_prefix)
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)
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end
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def self.absolute(url, cdn = Discourse.asset_host)
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cdn = "https:#{cdn}" if cdn && cdn =~ %r{^//}
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url =~ %r{^/[^/]} ? (cdn || Discourse.base_url_no_prefix) + url : url
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end
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def self.absolute_without_cdn(url)
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self.absolute(url, nil)
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end
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def self.schemaless(url)
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url.sub(/^http:/i, "")
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end
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def self.secure_proxy_without_cdn(url)
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self.absolute(Upload.secure_uploads_url_from_upload_url(url), nil)
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end
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def self.escape_uri(uri)
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Discourse.deprecate(
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"UrlHelper.escape_uri is deprecated. For normalization of user input use `.normalized_encode`. For true encoding, use `.encode`",
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output_in_test: true,
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drop_from: "3.0",
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)
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normalized_encode(uri)
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end
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def self.normalized_encode(uri)
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validated = nil
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url = uri.to_s
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# Ideally we will jump straight to `Addressable::URI.normalized_encode`. However,
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# that implementation has some edge-case issues like https://github.com/sporkmonger/addressable/issues/472.
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# To temporaily work around those issues for the majority of cases, we try parsing with `::URI`.
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# If that fails (e.g. due to non-ascii characters) then we will fall back to addressable.
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# Hopefully we can simplify this back to `Addressable::URI.normalized_encode` in the future.
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# edge case where we expect mailto:test%40test.com to normalize to mailto:test@test.com
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return normalize_with_addressable(url) if url.match(/\Amailto:/)
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# If it doesn't pass the regexp, it's definitely not gonna parse with URI.parse. Skip
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# to addressable
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return normalize_with_addressable(url) if !url.match?(/\A#{URI.regexp}\z/)
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begin
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normalize_with_ruby_uri(url)
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rescue URI::Error
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normalize_with_addressable(url)
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end
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end
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def self.rails_route_from_url(url)
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path = URI.parse(encode(url)).path
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Rails.application.routes.recognize_path(path)
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rescue Addressable::URI::InvalidURIError, URI::InvalidComponentError
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nil
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end
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def self.cook_url(url, secure: false, local: nil)
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is_secure = SiteSetting.secure_uploads && secure
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local = is_local(url) if local.nil?
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return url if !local
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url = is_secure ? secure_proxy_without_cdn(url) : absolute_without_cdn(url)
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# we always want secure uploads to come from
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# Discourse.base_url_no_prefix/secure-uploads
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# to avoid asset_host mixups
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return schemaless(url) if is_secure
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# PERF: avoid parsing url except for extreme conditions
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# this is a hot path used on home page
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filename = url
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if url.include?("?")
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uri = URI.parse(url)
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filename = File.basename(uri.path)
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end
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# this technically requires a filename, but will work with a URL as long as it end with the
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# extension and has no query params
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is_attachment = !FileHelper.is_supported_media?(filename)
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no_cdn = SiteSetting.login_required || SiteSetting.prevent_anons_from_downloading_files
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unless is_attachment && no_cdn
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url = Discourse.store.cdn_url(url)
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url = local_cdn_url(url) if Discourse.store.external?
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end
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schemaless(url)
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rescue URI::Error
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url
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end
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def self.local_cdn_url(url)
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return url if Discourse.asset_host.blank?
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if url.start_with?("/#{Discourse.store.upload_path}/")
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"#{Discourse.asset_host}#{url}"
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else
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url.sub(Discourse.base_url_no_prefix, Discourse.asset_host)
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end
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end
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private
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def self.normalize_with_addressable(url)
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u = Addressable::URI.normalized_encode(url, Addressable::URI)
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u.host = ::Addressable::IDNA.to_ascii(u.host) if u.host && !u.host.ascii_only?
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u.to_s
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end
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def self.normalize_with_ruby_uri(url)
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u = URI.parse(url)
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u.scheme = u.scheme.downcase if u.scheme && u.scheme != u.scheme.downcase
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u.host = u.host.downcase if u.host && u.host != u.host.downcase
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u.to_s
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end
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end
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