145 lines
4.4 KiB
Ruby
145 lines
4.4 KiB
Ruby
require 'zlib'
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require 'active_support/core_ext/file'
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require 'action_controller/metal/exceptions'
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module ActionView
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class AssetPaths #:nodoc:
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URI_REGEXP = %r{^[-a-z]+://|^(?:cid|data):|^//}
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attr_reader :config, :controller
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def initialize(config, controller = nil)
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@config = config
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@controller = controller
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end
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# Add the extension +ext+ if not present. Return full or scheme-relative URLs otherwise untouched.
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# Prefix with <tt>/dir/</tt> if lacking a leading +/+. Account for relative URL
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# roots. Rewrite the asset path for cache-busting asset ids. Include
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# asset host, if configured, with the correct request protocol.
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#
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# When :relative (default), the protocol will be determined by the client using current protocol
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# When :request, the protocol will be the request protocol
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# Otherwise, the protocol is used (E.g. :http, :https, etc)
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def compute_public_path(source, dir, options = {})
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source = source.to_s
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return source if is_uri?(source)
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source = rewrite_extension(source, dir, options[:ext]) if options[:ext]
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source = rewrite_asset_path(source, dir, options)
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source = rewrite_relative_url_root(source, relative_url_root)
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source = rewrite_host_and_protocol(source, options[:protocol])
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source
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end
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# Return the filesystem path for the source
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def compute_source_path(source, dir, ext)
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source = rewrite_extension(source, dir, ext) if ext
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sources = []
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sources << config.assets_dir
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sources << dir unless source[0] == ?/
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sources << source
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File.join(sources)
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end
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def is_uri?(path)
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path =~ URI_REGEXP
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end
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private
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def rewrite_extension(source, dir, ext)
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raise NotImplementedError
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end
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def rewrite_asset_path(source, path = nil)
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raise NotImplementedError
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end
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def rewrite_relative_url_root(source, relative_url_root)
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relative_url_root && !source.starts_with?("#{relative_url_root}/") ? "#{relative_url_root}#{source}" : source
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end
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def has_request?
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controller.respond_to?(:request)
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end
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def rewrite_host_and_protocol(source, protocol = nil)
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host = compute_asset_host(source)
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if host && !is_uri?(host)
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if (protocol || default_protocol) == :request && !has_request?
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host = nil
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else
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host = "#{compute_protocol(protocol)}#{host}"
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end
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end
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host ? "#{host}#{source}" : source
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end
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def compute_protocol(protocol)
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protocol ||= default_protocol
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case protocol
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when :relative
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"//"
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when :request
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unless @controller
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invalid_asset_host!("The protocol requested was :request. Consider using :relative instead.")
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end
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@controller.request.protocol
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else
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"#{protocol}://"
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end
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end
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def default_protocol
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@config.default_asset_host_protocol || (has_request? ? :request : :relative)
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end
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def invalid_asset_host!(help_message)
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raise ActionController::RoutingError, "This asset host cannot be computed without a request in scope. #{help_message}"
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end
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# Pick an asset host for this source. Returns +nil+ if no host is set,
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# the host if no wildcard is set, the host interpolated with the
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# numbers 0-3 if it contains <tt>%d</tt> (the number is the source hash mod 4),
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# or the value returned from invoking call on an object responding to call
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# (proc or otherwise).
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def compute_asset_host(source)
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if host = asset_host_config
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if host.respond_to?(:call)
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args = [source]
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arity = arity_of(host)
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if (arity > 1 || arity < -2) && !has_request?
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invalid_asset_host!("Remove the second argument to your asset_host Proc if you do not need the request, or make it optional.")
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end
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args << current_request if (arity > 1 || arity < 0) && has_request?
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host.call(*args)
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else
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(host =~ /%d/) ? host % (Zlib.crc32(source) % 4) : host
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end
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end
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end
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def relative_url_root
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config.relative_url_root || current_request.try(:script_name)
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end
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def asset_host_config
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config.asset_host
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end
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# Returns the current request if one exists.
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def current_request
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controller.request if has_request?
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end
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# Returns the arity of a callable
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def arity_of(callable)
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callable.respond_to?(:arity) ? callable.arity : callable.method(:call).arity
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end
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end
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end
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