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require 'html/pipeline/filter'
require 'uri'
module Gitlab
module Markdown
# HTML filter that "fixes" relative links to files in a repository.
#
# Context options:
# :commit
# :project
# :project_wiki
# :requested_path
# :ref
class RelativeLinkFilter < HTML::Pipeline::Filter
def call
if linkable_files?
doc.search('a').each do |el|
process_link_attr el.attribute('href')
end
doc.search('img').each do |el|
process_link_attr el.attribute('src')
end
end
doc
end
protected
def linkable_files?
context[:project_wiki].nil? && repository.try(:exists?) && !repository.empty?
end
def process_link_attr(html_attr)
return if html_attr.blank?
uri = URI(html_attr.value)
if uri.relative? && uri.path.present?
html_attr.value = rebuild_relative_uri(uri).to_s
end
end
def rebuild_relative_uri(uri)
file_path = relative_file_path(uri.path)
uri.path = [
relative_url_root,
context[:project].path_with_namespace,
path_type(file_path),
ref || 'master', # assume that if no ref exists we can point to master
file_path
].compact.join('/').squeeze('/').chomp('/')
uri
end
def relative_file_path(path)
nested_path = build_nested_path(path, context[:requested_path])
file_exists?(nested_path) ? nested_path : path
end
# Covering a special case, when the link is referencing file in the same
# directory.
# If we are at doc/api/README.md and the README.md contains relative
# links like [Users](users.md), this takes the request
# path(doc/api/README.md) and replaces the README.md with users.md so the
# path looks like doc/api/users.md.
# If we are at doc/api and the README.md shown in below the tree view
# this takes the request path(doc/api) and adds users.md so the path
# looks like doc/api/users.md
def build_nested_path(path, request_path)
return request_path if path.empty?
return path unless request_path
parts = request_path.split('/')
parts.pop if path_type(request_path) != 'tree'
parts.push(path).join('/')
end
def file_exists?(path)
return false if path.nil?
repository.blob_at(current_sha, path).present? ||
repository.tree(current_sha, path).entries.any?
end
# Check if the path is pointing to a directory(tree) or a file(blob)
# eg. doc/api is directory and doc/README.md is file.
def path_type(path)
return 'tree' if repository.tree(current_sha, path).entries.any?
return 'raw' if repository.blob_at(current_sha, path).try(:image?)
'blob'
end
def current_sha
context[:commit].try(:id) ||
ref ? repository.commit(ref).try(:sha) : repository.head_commit.sha
end
def relative_url_root
Gitlab.config.gitlab.relative_url_root.presence || '/'
end
def ref
context[:ref]
end
def repository
context[:project].try(:repository)
end
end
end
end
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