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 <tt>/dir/</tt> 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 <tt>%d</tt> (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
