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require 'active_support/core_ext/file'
module ActionView
class AssetPaths #:nodoc:
attr_reader :config, :controller
def initialize(config, controller = nil)
@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)
source = rewrite_relative_url_root(source, relative_url_root) if has_request?
source = rewrite_host_and_protocol(source) if include_host
source
end
# Return the filesystem path for the source
def compute_source_path(source, dir, ext)
source = rewrite_extension(source, dir, ext) if ext
File.join(config.assets_dir, dir, 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_relative_url_root(source, relative_url_root)
relative_url_root && !source.starts_with?("#{relative_url_root}/") ? "#{relative_url_root}#{source}" : source
end
def has_request?
controller.respond_to?(:request)
end
def rewrite_host_and_protocol(source)
host = compute_asset_host(source)
host = "//#{host}" if host && !is_uri?(host)
host.nil? ? source : "#{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 = asset_host_config
if host.respond_to?(:call)
args = [source]
arity = arity_of(host)
if arity > 1 && !has_request?
raise ActionController::RoutingError, "This asset host cannot be computed without a request in scope. Remove the second argument to your asset_host Proc if you do not need the request."
end
args << current_request if (arity > 1 || arity < 0) && has_request?
host.call(*args)
else
(host =~ /%d/) ? host % (source.hash % 4) : host
end
end
end
def relative_url_root
if controller.respond_to?(:config) && controller.config
controller.config.relative_url_root
elsif config.respond_to?(:action_controller) && config.action_controller
config.action_controller.relative_url_root
elsif Rails.respond_to?(:application) && Rails.application.config
Rails.application.config.action_controller.relative_url_root
end
end
def asset_host_config
if config.respond_to?(:asset_host)
config.asset_host
elsif Rails.respond_to?(:application)
Rails.application.config.action_controller.asset_host
end
end
# Returns the current request if one exists.
def current_request
controller.request if has_request?
end
# Returns the arity of a callable
def arity_of(callable)
callable.respond_to?(:arity) ? callable.arity : callable.method(:call).arity
end
end
end
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