diff options
Diffstat (limited to 'actionpack/lib/action_view/helpers/asset_tag_helpers/asset_paths.rb')
| -rw-r--r-- | actionpack/lib/action_view/helpers/asset_tag_helpers/asset_paths.rb | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/helpers/asset_tag_helpers/asset_paths.rb b/actionpack/lib/action_view/helpers/asset_tag_helpers/asset_paths.rb new file mode 100644 index 0000000000..b4e61f2034 --- /dev/null +++ b/actionpack/lib/action_view/helpers/asset_tag_helpers/asset_paths.rb @@ -0,0 +1,153 @@ +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 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 + + # 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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