require 'active_support/core_ext/file'
module ActionView
module Helpers
module AssetTagHelper
module CommonAssetHelpers
private
# Add the the extension +ext+ if not present. Return full 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)
return source if is_uri?(source)
source = rewrite_extension(source, dir, ext) if ext
source = "/#{dir}/#{source}" unless source[0] == ?/
if controller.respond_to?(:env) && controller.env["action_dispatch.asset_path"]
source = rewrite_asset_path(source, controller.env["action_dispatch.asset_path"])
end
source = rewrite_asset_path(source, config.asset_path)
has_request = controller.respond_to?(:request)
source = rewrite_relative_url_root(source, controller.config.relative_url_root) if has_request && include_host
source = rewrite_host_and_protocol(source, has_request) if include_host
source
end
def is_uri?(path)
path =~ %r{^[-a-z]+://|^cid:}
end
def rewrite_extension(source, dir, ext)
source_ext = File.extname(source)
source_with_ext = if source_ext.empty?
"#{source}.#{ext}"
elsif ext != source_ext[1..-1]
with_ext = "#{source}.#{ext}"
with_ext if File.exist?(File.join(config.assets_dir, dir, with_ext))
end
source_with_ext || source
end
# Break out the asset path rewrite in case plugins wish to put the asset id
# someplace other than the query string.
def rewrite_asset_path(source, path = nil)
if path && path.respond_to?(:call)
return path.call(source)
elsif path && path.is_a?(String)
return path % [source]
else
handle_asset_id(source)
end
end
# This is the default implementation
def handle_asset_id(source)
source
end
def rewrite_relative_url_root(source, relative_url_root)
relative_url_root && !source.starts_with?("#{relative_url_root}/") ? "#{relative_url_root}#{source}" : source
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 the proc if it's a proc or the value from
# invoking call if it's an object responding to call.
def compute_asset_host(source)
if host = config.asset_host
if host.is_a?(Proc) || 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
end
