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# frozen_string_literal: true
require 'securerandom'
require 'logger'
module Sprockets
# Public: Manifest utilities.
module ManifestUtils
extend self
MANIFEST_RE = /^\.sprockets-manifest-[0-9a-f]{32}.json$/
# Public: Generate a new random manifest path.
#
# Manifests are not intended to be accessed publicly, but typically live
# alongside public assets for convenience. To avoid being served, the
# filename is prefixed with a "." which is usually hidden by web servers
# like Apache. To help in other environments that may not control this,
# a random hex string is appended to the filename to prevent people from
# guessing the location. If directory indexes are enabled on the server,
# all bets are off.
#
# Return String path.
def generate_manifest_path
".sprockets-manifest-#{SecureRandom.hex(16)}.json"
end
# Public: Find or pick a new manifest filename for target build directory.
#
# dirname - String dirname
#
# Examples
#
# find_directory_manifest("/app/public/assets")
# # => "/app/public/assets/.sprockets-manifest-abc123.json"
#
# Returns String filename.
def find_directory_manifest(dirname, logger = Logger.new($stderr))
entries = File.directory?(dirname) ? Dir.entries(dirname) : []
manifest_entries = entries.select { |e| e =~ MANIFEST_RE }
if manifest_entries.length > 1
manifest_entries.sort!
logger.warn("Found multiple manifests: #{manifest_entries}. Choosing the first alphabetically: #{manifest_entries.first}")
end
entry = manifest_entries.first || generate_manifest_path
File.join(dirname, entry)
end
end
end
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