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|
# frozen_string_literal: true
require 'uri'
module Banzai
module Filter
# HTML filter that "fixes" relative links to files in a repository.
#
# Context options:
# :commit
# :current_user
# :project
# :wiki
# :ref
# :requested_path
# :system_note
class RepositoryLinkFilter < BaseRelativeLinkFilter
def call
return doc if context[:system_note]
clear_memoization(:linkable_files)
clear_memoization(:linkable_attributes)
load_uri_types
linkable_attributes.each do |attr|
if linkable_files? && repo_visible_to_user?
process_link_to_repository_attr(attr)
end
end
doc
end
protected
def load_uri_types
return unless linkable_attributes.present?
return unless linkable_files?
return {} unless repository
@uri_types = request_path.present? ? get_uri_types([request_path]) : {}
paths = linkable_attributes.flat_map do |attr|
[get_uri(attr).to_s, relative_file_path(get_uri(attr))]
end
paths.reject!(&:blank?)
paths.uniq!
@uri_types.merge!(get_uri_types(paths))
end
def linkable_files?
strong_memoize(:linkable_files) do
context[:wiki].nil? && repository.try(:exists?) && !repository.empty?
end
end
def get_uri_types(paths)
return {} if paths.empty?
uri_types = paths.index_with { nil }
get_blob_types(paths).each do |name, type|
if type == :blob
blob = ::Blob.decorate(Gitlab::Git::Blob.new(name: name), project)
uri_types[name] = blob.image? || blob.video? || blob.audio? ? :raw : :blob
else
uri_types[name] = type
end
end
uri_types
end
def get_blob_types(paths)
revision_paths = paths.collect do |path|
[current_commit.sha, path.chomp("/")]
end
Gitlab::GitalyClient::BlobService.new(repository).get_blob_types(revision_paths, 1)
rescue GRPC::Unavailable, GRPC::DeadlineExceeded => e
# Handle Gitaly connection issues gracefully
Gitlab::ErrorTracking.track_exception(e, project_id: project.id)
# Return all links as blob types
paths.collect do |path|
[path, :blob]
end
end
def get_uri(html_attr)
uri = URI(html_attr.value)
uri if uri.relative? && uri.path.present?
rescue URI::Error, Addressable::URI::InvalidURIError
end
def process_link_to_repository_attr(html_attr)
uri = URI(html_attr.value)
if uri.relative? && uri.path.present?
html_attr.value = rebuild_relative_uri(uri).to_s
html_attr.parent.add_class('gfm')
end
rescue URI::Error, Addressable::URI::InvalidURIError
# noop
end
def rebuild_relative_uri(uri)
file_path = nested_file_path_if_exists(uri)
resource_type = uri_type(file_path)
# Repository routes are under /-/ scope now.
# Since we craft a path without using route helpers we must
# ensure - is added here.
prefix = '-' if %w(tree blob raw commits).include?(resource_type.to_s)
uri.path = [
relative_url_root,
project.full_path,
prefix,
resource_type,
Addressable::URI.escape(ref).gsub('#', '%23'),
Addressable::URI.escape(file_path)
].compact.join('/').squeeze('/').chomp('/')
uri
end
def nested_file_path_if_exists(uri)
path = cleaned_file_path(uri)
nested_path = relative_file_path(uri)
path_exists?(nested_path) ? nested_path : path
end
def cleaned_file_path(uri)
unescape_and_scrub_uri(uri.path).delete("\0").chomp("/")
end
def relative_file_path(uri)
return if uri.nil?
build_relative_path(cleaned_file_path(uri), request_path)
end
def request_path
return unless context[:requested_path]
unescape_and_scrub_uri(context[:requested_path]).chomp("/")
end
# Convert a relative path into its correct location based on the currently
# requested path
#
# path - Relative path String
# request_path - Currently-requested path String
#
# Examples:
#
# # File in the same directory as the current path
# build_relative_path("users.md", "doc/api/README.md")
# # => "doc/api/users.md"
#
# # File in the same directory, which is also the current path
# build_relative_path("users.md", "doc/api")
# # => "doc/api/users.md"
#
# # Going up one level to a different directory
# build_relative_path("../update/7.14-to-8.0.md", "doc/api/README.md")
# # => "doc/update/7.14-to-8.0.md"
#
# Returns a String
def build_relative_path(path, request_path)
return request_path if path.empty?
return path unless request_path
return path[1..] if path.start_with?('/')
parts = request_path.split('/')
parts.pop if uri_type(request_path) != :tree
path.delete_prefix!('./')
while path.start_with?('../')
parts.pop
path.sub!('../', '')
end
parts.push(path).join('/')
end
def path_exists?(path)
path.present? && @uri_types[path] != :unknown
end
def uri_type(path)
@uri_types[path] == :unknown ? :blob : @uri_types[path]
end
def current_commit
@current_commit ||= context[:commit] || repository.commit(ref)
end
def repo_visible_to_user?
project && Ability.allowed?(current_user, :download_code, project)
end
def ref
context[:ref] || project.default_branch
end
def current_user
context[:current_user]
end
def repository
@repository ||= project&.repository
end
end
end
end
|
