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# frozen_string_literal: true
# Module providing methods for dealing with separating a tree-ish string and a
# file path string when combined in a request parameter
module ExtractsPath
extend ::Gitlab::Utils::Override
include ExtractsRef
# If we have an ID of 'foo.atom', and the controller provides Atom and HTML
# formats, then we have to check if the request was for the Atom version of
# the ID without the '.atom' suffix, or the HTML version of the ID including
# the suffix. We only check this if the version including the suffix doesn't
# match, so it is possible to create a branch which has an unroutable Atom
# feed.
def extract_ref_without_atom(id)
id_without_atom = id.sub(/\.atom$/, '')
valid_refs = ref_names.select { |v| "#{id_without_atom}/".start_with?("#{v}/") }
raise InvalidPathError if valid_refs.blank?
valid_refs.max_by(&:length)
end
# Extends the method to handle if there is no path and the ref doesn't
# exist in the repo, try to resolve the ref without an '.atom' suffix.
# If _that_ ref is found, set the request's format to Atom manually.
#
# Automatically renders `not_found!` if a valid tree path could not be
# resolved (e.g., when a user inserts an invalid path or ref).
#
# Automatically redirects to the current default branch if the ref matches a
# previous default branch that has subsequently been deleted.
#
# rubocop:disable Gitlab/ModuleWithInstanceVariables
override :assign_ref_vars
def assign_ref_vars
super
rectify_atom!
rectify_renamed_default_branch! && return
raise InvalidPathError unless @commit
@hex_path = Digest::SHA1.hexdigest(@path)
@logs_path = logs_file_project_ref_path(@project, @ref, @path)
rescue RuntimeError, NoMethodError, InvalidPathError
render_404
end
# rubocop:enable Gitlab/ModuleWithInstanceVariables
private
# Override in controllers to determine which actions are subject to the redirect
def redirect_renamed_default_branch?
false
end
# rubocop:disable Gitlab/ModuleWithInstanceVariables
def rectify_atom!
return if @commit
return unless @id.ends_with?('.atom')
return unless @path.empty?
@id = @ref = extract_ref_without_atom(@id)
@commit = @repo.commit(@ref)
request.format = :atom if @commit
end
# rubocop:enable Gitlab/ModuleWithInstanceVariables
# For GET/HEAD requests, if the ref doesn't exist in the repository, check
# whether we're trying to access a renamed default branch. If we are, we can
# redirect to the current default branch instead of rendering a 404.
# rubocop:disable Gitlab/ModuleWithInstanceVariables
def rectify_renamed_default_branch!
return unless redirect_renamed_default_branch?
return if @commit
return unless @id && @ref && repository_container.respond_to?(:previous_default_branch)
return unless repository_container.previous_default_branch == @ref
return unless request.get? || request.head?
flash[:notice] = _('The default branch for this project has been changed. Please update your bookmarks.')
redirect_to url_for(id: @id.sub(/\A#{Regexp.escape(@ref)}/, repository_container.default_branch))
true
end
# rubocop:enable Gitlab/ModuleWithInstanceVariables
override :repository_container
def repository_container
@project
end
end
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