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require 'active_support/core_ext/file'
module ActionView
module Helpers
module AssetTagHelper
class AssetPaths
# You can enable or disable the asset tag ids cache.
# With the cache enabled, the asset tag helper methods will make fewer
# expensive file system calls (the default implementation checks the file
# system timestamp). However this prevents you from modifying any asset
# files while the server is running.
#
# ActionView::Helpers::AssetTagHelper::AssetPaths.cache_asset_ids = false
mattr_accessor :cache_asset_ids
attr_reader :config, :controller
def initialize(config, controller)
@config = config
@controller = controller
end
# Add 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] == ?/
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
# Add or change an asset id in the asset id cache. This can be used
# for SASS on Heroku.
# :api: public
def add_to_asset_ids_cache(source, asset_id)
self.asset_ids_cache_guard.synchronize do
self.asset_ids_cache[source] = asset_id
end
end
def is_uri?(path)
path =~ %r{^[-a-z]+://|^cid:}
end
private
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]
end
asset_id = rails_asset_id(source)
if asset_id.empty?
source
else
"#{source}?#{asset_id}"
end
end
mattr_accessor :asset_ids_cache
self.asset_ids_cache = {}
mattr_accessor :asset_ids_cache_guard
self.asset_ids_cache_guard = Mutex.new
# Use the RAILS_ASSET_ID environment variable or the source's
# modification time as its cache-busting asset id.
def rails_asset_id(source)
if asset_id = ENV["RAILS_ASSET_ID"]
asset_id
else
if self.cache_asset_ids && (asset_id = self.asset_ids_cache[source])
asset_id
else
path = File.join(config.assets_dir, source)
asset_id = File.exist?(path) ? File.mtime(path).to_i.to_s : ''
if self.cache_asset_ids
add_to_asset_ids_cache(source, asset_id)
end
asset_id
end
end
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
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