182 lines
4.8 KiB
Ruby
182 lines
4.8 KiB
Ruby
# frozen_string_literal: true
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require 'uri'
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module Banzai
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module Filter
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# HTML filter that "fixes" relative links to uploads or files in a repository.
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#
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# Context options:
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# :commit
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# :group
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# :project
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# :project_wiki
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# :ref
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# :requested_path
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class RelativeLinkFilter < HTML::Pipeline::Filter
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include Gitlab::Utils::StrongMemoize
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def call
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@uri_types = {}
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clear_memoization(:linkable_files)
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doc.search('a:not(.gfm)').each do |el|
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process_link_attr el.attribute('href')
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end
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doc.css('img, video').each do |el|
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process_link_attr el.attribute('src')
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process_link_attr el.attribute('data-src')
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end
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doc
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end
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protected
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def linkable_files?
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strong_memoize(:linkable_files) do
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context[:project_wiki].nil? && repository.try(:exists?) && !repository.empty?
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end
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end
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def process_link_attr(html_attr)
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return if html_attr.blank?
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return if html_attr.value.start_with?('//')
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if html_attr.value.start_with?('/uploads/')
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process_link_to_upload_attr(html_attr)
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elsif linkable_files?
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process_link_to_repository_attr(html_attr)
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end
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end
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def process_link_to_upload_attr(html_attr)
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path_parts = [Addressable::URI.unescape(html_attr.value)]
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if group
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path_parts.unshift(relative_url_root, 'groups', group.full_path, '-')
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elsif project
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path_parts.unshift(relative_url_root, project.full_path)
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else
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path_parts.unshift(relative_url_root)
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end
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begin
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path = Addressable::URI.escape(File.join(*path_parts))
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rescue Addressable::URI::InvalidURIError
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return
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end
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html_attr.value =
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if context[:only_path]
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path
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else
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Addressable::URI.join(Gitlab.config.gitlab.base_url, path).to_s
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end
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end
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def process_link_to_repository_attr(html_attr)
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uri = URI(html_attr.value)
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if uri.relative? && uri.path.present?
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html_attr.value = rebuild_relative_uri(uri).to_s
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end
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rescue URI::Error, Addressable::URI::InvalidURIError
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# noop
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end
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def rebuild_relative_uri(uri)
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file_path = relative_file_path(uri)
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uri.path = [
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relative_url_root,
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project.full_path,
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uri_type(file_path),
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Addressable::URI.escape(ref).gsub('#', '%23'),
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Addressable::URI.escape(file_path)
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].compact.join('/').squeeze('/').chomp('/')
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uri
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end
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def relative_file_path(uri)
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path = Addressable::URI.unescape(uri.path)
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request_path = Addressable::URI.unescape(context[:requested_path])
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nested_path = build_relative_path(path, request_path)
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file_exists?(nested_path) ? nested_path : path
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end
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# Convert a relative path into its correct location based on the currently
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# requested path
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#
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# path - Relative path String
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# request_path - Currently-requested path String
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#
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# Examples:
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#
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# # File in the same directory as the current path
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# build_relative_path("users.md", "doc/api/README.md")
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# # => "doc/api/users.md"
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#
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# # File in the same directory, which is also the current path
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# build_relative_path("users.md", "doc/api")
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# # => "doc/api/users.md"
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#
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# # Going up one level to a different directory
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# build_relative_path("../update/7.14-to-8.0.md", "doc/api/README.md")
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# # => "doc/update/7.14-to-8.0.md"
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#
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# Returns a String
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def build_relative_path(path, request_path)
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return request_path if path.empty?
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return path unless request_path
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return path[1..-1] if path.start_with?('/')
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parts = request_path.split('/')
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parts.pop if uri_type(request_path) != :tree
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path.sub!(%r{\A\./}, '')
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while path.start_with?('../')
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parts.pop
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path.sub!('../', '')
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end
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parts.push(path).join('/')
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end
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def file_exists?(path)
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path.present? && !!uri_type(path)
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end
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def uri_type(path)
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@uri_types[path] ||= current_commit.uri_type(path)
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end
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def current_commit
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@current_commit ||= context[:commit] || repository.commit(ref)
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end
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def relative_url_root
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Gitlab.config.gitlab.relative_url_root.presence || '/'
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end
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def ref
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context[:ref] || project.default_branch
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end
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def group
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context[:group]
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end
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def project
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context[:project]
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end
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def repository
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@repository ||= project&.repository
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end
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end
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end
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end
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