require 'active_support/core_ext/file' module ActionView module Helpers class AssetPaths #:nodoc: attr_reader :config, :controller def initialize(config, controller) @config = config @controller = controller end # Add the extension +ext+ if not present. Return full or scheme-relative URLs otherwise untouched. # Prefix with /dir/ if lacking a leading +/+. Account for relative URL # roots. Rewrite the asset path for cache-busting asset ids. Include # asset host, if configured, with the correct request protocol. def compute_public_path(source, dir, ext = nil, include_host = true) source = source.to_s return source if is_uri?(source) source = rewrite_extension(source, dir, ext) if ext source = rewrite_asset_path(source, dir) if controller && include_host has_request = controller.respond_to?(:request) source = rewrite_host_and_protocol(source, has_request) end source end def is_uri?(path) path =~ %r{^[-a-z]+://|^cid:|^//} end private def rewrite_extension(source, dir, ext) raise NotImplementedError end def rewrite_asset_path(source, path = nil) raise NotImplementedError end def rewrite_host_and_protocol(source, has_request) host = compute_asset_host(source) if has_request && host && !is_uri?(host) host = "#{controller.request.protocol}#{host}" end "#{host}#{source}" end # Pick an asset host for this source. Returns +nil+ if no host is set, # the host if no wildcard is set, the host interpolated with the # numbers 0-3 if it contains %d (the number is the source hash mod 4), # or the value returned from invoking call on an object responding to call # (proc or otherwise). def compute_asset_host(source) if host = config.asset_host if host.respond_to?(:call) case host.is_a?(Proc) ? host.arity : host.method(:call).arity when 2 request = controller.respond_to?(:request) && controller.request host.call(source, request) else host.call(source) end else (host =~ /%d/) ? host % (source.hash % 4) : host end end end end end end