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Refactor AssetUrlHelper to make it friendly for plugins and extensions

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Add asset_path/url helper for a consolidated entry point
Expose compute_asset_path as a public API
Expose compute_asset_host as a public API
Move RAILS_ASSET_ID to its own module, AssetIdHelper
Removed AV::AssetPaths
This commit is contained in:
Joshua Peek 2012-10-12 16:56:00 -05:00
parent bd38d9f211
commit 1e2b0ce95e
9 changed files with 275 additions and 346 deletions
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1
actionpack/lib/action_view.rb
View file

@ -29,7 +29,6 @@ module ActionView
extend ActiveSupport::Autoload
eager_autoload do
autoload :AssetPaths
autoload :Base
autoload :Context
autoload :CompiledTemplates, "action_view/context"

143
actionpack/lib/action_view/asset_paths.rb
View file

@ -1,143 +0,0 @@
require 'zlib'
require 'active_support/core_ext/file'
module ActionView
class AssetPaths #:nodoc:
URI_REGEXP = %r{^[-a-z]+://|^(?:cid|data):|^//}
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.
#
# When :relative (default), the protocol will be determined by the client using current protocol
# When :request, the protocol will be the request protocol
# Otherwise, the protocol is used (E.g. :http, :https, etc)
def compute_public_path(source, dir, options = {})
source = source.to_s
return source if is_uri?(source)
source = rewrite_extension(source, dir, options[:ext]) if options[:ext]
source = rewrite_asset_path(source, dir, options)
source = rewrite_relative_url_root(source, relative_url_root)
source = rewrite_host_and_protocol(source, options[:protocol])
source
end
# Return the filesystem path for the source
def compute_source_path(source, dir, ext)
source = rewrite_extension(source, dir, ext) if ext
sources = []
sources << config.assets_dir
sources << dir unless source[0] == ?/
sources << source
File.join(sources)
end
def is_uri?(path)
path =~ URI_REGEXP
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, protocol = nil)
host = compute_asset_host(source)
if host && !is_uri?(host)
if (protocol || default_protocol) == :request && !has_request?
host = nil
else
host = "#{compute_protocol(protocol)}#{host}"
end
end
host ? "#{host}#{source}" : source
end
def compute_protocol(protocol)
protocol ||= default_protocol
case protocol
when :relative
"//"
when :request
unless @controller
invalid_asset_host!("The protocol requested was :request. Consider using :relative instead.")
end
@controller.request.protocol
else
"#{protocol}://"
end
end
def default_protocol
@config.default_asset_host_protocol || (has_request? ? :request : :relative)
end
def invalid_asset_host!(help_message)
raise ActionView::MissingRequestError, "This asset host cannot be computed without a request in scope. #{help_message}"
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 || arity < -2) && !has_request?
invalid_asset_host!("Remove the second argument to your asset_host Proc if you do not need the request, or make it optional.")
end
args << current_request if (arity > 1 || arity < 0) && has_request?
host.call(*args)
else
(host =~ /%d/) ? host % (Zlib.crc32(source) % 4) : host
end
end
end
def relative_url_root
config.relative_url_root || current_request.try(:script_name)
end
def asset_host_config
config.asset_host
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

1
actionpack/lib/action_view/helpers.rb
View file

@ -3,6 +3,7 @@ module ActionView #:nodoc:
extend ActiveSupport::Autoload
autoload :ActiveModelHelper
autoload :AssetIdHelper
autoload :AssetTagHelper
autoload :AssetUrlHelper
autoload :AtomFeedHelper

154
actionpack/lib/action_view/helpers/asset_id_helper.rb Normal file
View file

@ -0,0 +1,154 @@
require 'thread'
require 'active_support/core_ext/file'
require 'active_support/core_ext/module/attribute_accessors'
module ActionView
# = Action View Asset Cache ID Helpers
#
# Rails appends asset's timestamps to public asset paths. This allows
# you to set a cache-expiration date for the asset far into the future, but
# still be able to instantly invalidate it by simply updating the file (and
# hence updating the timestamp, which then updates the URL as the timestamp
# is part of that, which in turn busts the cache).
#
# It's the responsibility of the web server you use to set the far-future
# expiration date on cache assets that you need to take advantage of this
# feature. Here's an example for Apache:
#
# # Asset Expiration
# ExpiresActive On
# <FilesMatch "\.(ico|gif|jpe?g|png|js|css)$">
# ExpiresDefault "access plus 1 year"
# </FilesMatch>
#
# Also note that in order for this to work, all your application servers must
# return the same timestamps. This means that they must have their clocks
# synchronized. If one of them drifts out of sync, you'll see different
# timestamps at random and the cache won't work. In that case the browser
# will request the same assets over and over again even thought they didn't
# change. You can use something like Live HTTP Headers for Firefox to verify
# that the cache is indeed working.
#
# This strategy works well enough for most server setups and requires the
# least configuration, but if you deploy several application servers at
# different times - say to handle a temporary spike in load - then the
# asset time stamps will be out of sync. In a setup like this you may want
# to set the way that asset paths are generated yourself.
#
# Altering the asset paths that Rails generates can be done in two ways.
# The easiest is to define the RAILS_ASSET_ID environment variable. The
# contents of this variable will always be used in preference to
# calculated timestamps. A more complex but flexible way is to set
# <tt>ActionController::Base.config.asset_path</tt> to a proc
# that takes the unmodified asset path and returns the path needed for
# your asset caching to work. Typically you'd do something like this in
# <tt>config/environments/production.rb</tt>:
#
# # Normally you'd calculate RELEASE_NUMBER at startup.
# RELEASE_NUMBER = 12345
# config.action_controller.asset_path = proc { |asset_path|
# "/release-#{RELEASE_NUMBER}#{asset_path}"
# }
#
# This example would cause the following behavior on all servers no
# matter when they were deployed:
#
# image_tag("rails.png")
# # => <img alt="Rails" src="/release-12345/images/rails.png" />
# stylesheet_link_tag("application")
# # => <link href="/release-12345/stylesheets/application.css?1232285206" media="screen" rel="stylesheet" />
#
# Changing the asset_path does require that your web servers have
# knowledge of the asset template paths that you rewrite to so it's not
# suitable for out-of-the-box use. To use the example given above you
# could use something like this in your Apache VirtualHost configuration:
#
# <LocationMatch "^/release-\d+/(images|javascripts|stylesheets)/.*$">
# # Some browsers still send conditional-GET requests if there's a
# # Last-Modified header or an ETag header even if they haven't
# # reached the expiry date sent in the Expires header.
# Header unset Last-Modified
# Header unset ETag
# FileETag None
#
# # Assets requested using a cache-busting filename should be served
# # only once and then cached for a really long time. The HTTP/1.1
# # spec frowns on hugely-long expiration times though and suggests
# # that assets which never expire be served with an expiration date
# # 1 year from access.
# ExpiresActive On
# ExpiresDefault "access plus 1 year"
# </LocationMatch>
#
# # We use cached-busting location names with the far-future expires
# # headers to ensure that if a file does change it can force a new
# # request. The actual asset filenames are still the same though so we
# # need to rewrite the location from the cache-busting location to the
# # real asset location so that we can serve it.
# RewriteEngine On
# RewriteRule ^/release-\d+/(images|javascripts|stylesheets)/(.*)$ /$1/$2 [L]
#
module Helpers #:nodoc:
module AssetIdHelper
# 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::AssetIdHelper.cache_asset_ids = false
mattr_accessor :cache_asset_ids
# 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
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
# Override +compute_asset_path+ to add asset id query strings to
# generated urls. See +compute_asset_path+ in AssetUrlHelper.
def compute_asset_path(source, options = {})
source = super(source, options)
path = config.asset_path
if path && path.respond_to?(:call)
path.call(source)
elsif path && path.is_a?(String)
path % [source]
elsif asset_id = rails_asset_id(source)
asset_id.empty? ? source : "#{source}?#{asset_id}"
end
end
end
end
end

1
actionpack/lib/action_view/helpers/asset_tag_helper.rb
View file

@ -19,6 +19,7 @@ module ActionView
extend ActiveSupport::Concern
include AssetUrlHelper
include AssetIdHelper
include TagHelper
# Returns an HTML script tag for each of the +sources+ provided.

94
actionpack/lib/action_view/helpers/asset_tag_helpers/asset_paths.rb
View file

@ -1,94 +0,0 @@
require 'thread'
require 'active_support/core_ext/file'
require 'active_support/core_ext/module/attribute_accessors'
module ActionView
module Helpers
module AssetTagHelper
class AssetPaths < ::ActionView::AssetPaths #:nodoc:
# 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
# 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
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, dir, options = nil)
dir = "/#{dir}" if dir && dir[0] != ?/
source = File.join(dir.to_s, source) unless source[0] == ?/
path = config.asset_path
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
end
end
end
end

189
actionpack/lib/action_view/helpers/asset_url_helper.rb
View file

@ -1,4 +1,4 @@
require 'action_view/helpers/asset_tag_helpers/asset_paths'
require 'zlib'
module ActionView
# = Action View Asset URL Helpers
@ -104,104 +104,12 @@ module ActionView
# "http://asset%d.example.com", "https://asset1.example.com"
# )
#
# === Customizing the asset path
#
# By default, Rails appends asset's timestamps to all asset paths. This allows
# you to set a cache-expiration date for the asset far into the future, but
# still be able to instantly invalidate it by simply updating the file (and
# hence updating the timestamp, which then updates the URL as the timestamp
# is part of that, which in turn busts the cache).
#
# It's the responsibility of the web server you use to set the far-future
# expiration date on cache assets that you need to take advantage of this
# feature. Here's an example for Apache:
#
# # Asset Expiration
# ExpiresActive On
# <FilesMatch "\.(ico|gif|jpe?g|png|js|css)$">
# ExpiresDefault "access plus 1 year"
# </FilesMatch>
#
# Also note that in order for this to work, all your application servers must
# return the same timestamps. This means that they must have their clocks
# synchronized. If one of them drifts out of sync, you'll see different
# timestamps at random and the cache won't work. In that case the browser
# will request the same assets over and over again even thought they didn't
# change. You can use something like Live HTTP Headers for Firefox to verify
# that the cache is indeed working.
#
# This strategy works well enough for most server setups and requires the
# least configuration, but if you deploy several application servers at
# different times - say to handle a temporary spike in load - then the
# asset time stamps will be out of sync. In a setup like this you may want
# to set the way that asset paths are generated yourself.
#
# Altering the asset paths that Rails generates can be done in two ways.
# The easiest is to define the RAILS_ASSET_ID environment variable. The
# contents of this variable will always be used in preference to
# calculated timestamps. A more complex but flexible way is to set
# <tt>ActionController::Base.config.asset_path</tt> to a proc
# that takes the unmodified asset path and returns the path needed for
# your asset caching to work. Typically you'd do something like this in
# <tt>config/environments/production.rb</tt>:
#
# # Normally you'd calculate RELEASE_NUMBER at startup.
# RELEASE_NUMBER = 12345
# config.action_controller.asset_path = proc { |asset_path|
# "/release-#{RELEASE_NUMBER}#{asset_path}"
# }
#
# This example would cause the following behavior on all servers no
# matter when they were deployed:
#
# image_tag("rails.png")
# # => <img alt="Rails" src="/release-12345/images/rails.png" />
# stylesheet_link_tag("application")
# # => <link href="/release-12345/stylesheets/application.css?1232285206" media="screen" rel="stylesheet" />
#
# Changing the asset_path does require that your web servers have
# knowledge of the asset template paths that you rewrite to so it's not
# suitable for out-of-the-box use. To use the example given above you
# could use something like this in your Apache VirtualHost configuration:
#
# <LocationMatch "^/release-\d+/(images|javascripts|stylesheets)/.*$">
# # Some browsers still send conditional-GET requests if there's a
# # Last-Modified header or an ETag header even if they haven't
# # reached the expiry date sent in the Expires header.
# Header unset Last-Modified
# Header unset ETag
# FileETag None
#
# # Assets requested using a cache-busting filename should be served
# # only once and then cached for a really long time. The HTTP/1.1
# # spec frowns on hugely-long expiration times though and suggests
# # that assets which never expire be served with an expiration date
# # 1 year from access.
# ExpiresActive On
# ExpiresDefault "access plus 1 year"
# </LocationMatch>
#
# # We use cached-busting location names with the far-future expires
# # headers to ensure that if a file does change it can force a new
# # request. The actual asset filenames are still the same though so we
# # need to rewrite the location from the cache-busting location to the
# # real asset location so that we can serve it.
# RewriteEngine On
# RewriteRule ^/release-\d+/(images|javascripts|stylesheets)/(.*)$ /$1/$2 [L]
#
module AssetUrlHelper
ASSET_EXTENSIONS = {
javascript: 'js',
stylesheet: 'css'
}
URI_REGEXP = %r{^[-a-z]+://|^(?:cid|data):|^//}
ASSET_PUBLIC_DIRECTORIES = {
audio: '/audios',
font: '/fonts',
image: '/images',
javascript: '/javascripts',
stylesheet: '/stylesheets',
video: '/videos'
ASSET_EXTENSIONS = {
javascript: '.js',
stylesheet: '.css'
}
# Computes the path to asset in public directory. If :type
@ -215,9 +123,28 @@ module ActionView
# asset_path "application", type: :stylesheet # => /stylesheets/application.css
# asset_path "http://www.example.com/js/xmlhr.js" # => http://www.example.com/js/xmlhr.js
def asset_path(source, options = {})
source = source.to_s
return "" unless source.present?
options[:ext] ||= ASSET_EXTENSIONS[options[:type]] if options[:type]
asset_paths.compute_public_path(source, ASSET_PUBLIC_DIRECTORIES[options[:type]], options)
return source if source =~ URI_REGEXP
if File.extname(source).empty? && (ext = ASSET_EXTENSIONS[options[:type]])
source = "#{source}#{ext}"
end
if source[0] != ?/
source = compute_asset_path(source, options)
end
current_request = controller.request if controller.respond_to?(:request)
if relative_url_root = config.relative_url_root || current_request.try(:script_name)
source = "#{relative_url_root}#{source}" unless source.starts_with?("#{relative_url_root}/")
end
if host = compute_asset_host(source, options)
source = "#{host}#{source}"
end
source
end
alias_method :path_to_asset, :asset_path # aliased to avoid conflicts with a asset_path named route
@ -225,11 +152,66 @@ module ActionView
# will use +asset_path+ internally, so most of their behaviors
# will be the same.
def asset_url(source, options = {})
host = url_for(:only_path => false)
URI.join(host, path_to_asset(source, options)).to_s
path_to_asset(source, options.merge(:protocol => :request))
end
alias_method :url_to_asset, :asset_url # aliased to avoid conflicts with an asset_url named route
# Maps asset types to public directory.
ASSET_PUBLIC_DIRECTORIES = {
audio: '/audios',
font: '/fonts',
image: '/images',
javascript: '/javascripts',
stylesheet: '/stylesheets',
video: '/videos'
}
# Computes asset path to public directory. Plugins and
# extensions can override this method to point to custom assets
# or generate digested paths or query strings.
def compute_asset_path(source, options = {})
dir = ASSET_PUBLIC_DIRECTORIES[options[:type]] || ""
File.join(dir, 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 = "", options = {})
if controller.respond_to?(:request)
request = controller.request
end
host = config.asset_host
host ||= request.base_url if request && options[:protocol] == :request
return unless host
if host.respond_to?(:call)
arity = host.respond_to?(:arity) ? host.arity : host.method(:call).arity
args = [source]
args << request if request && (arity > 1 || arity < 0)
host = host.call(*args)
elsif host =~ /%d/
host = host % (Zlib.crc32(source) % 4)
end
if host =~ URI_REGEXP
host
else
protocol = options[:protocol] || config.default_asset_host_protocol || (request ? :request : :relative)
case protocol
when :relative
"//#{host}"
when :request
"#{request.protocol}#{host}"
else
"#{protocol}://#{host}"
end
end
end
# Computes the path to a javascript asset in the public javascripts directory.
# If the +source+ filename has no extension, .js will be appended (except for explicit URIs)
# Full paths from the document root will be passed through.
@ -360,11 +342,6 @@ module ActionView
url_to_asset(source, type: :font)
end
alias_method :url_to_font, :font_url # aliased to avoid conflicts with an font_url named route
private
def asset_paths
@asset_paths ||= AssetTagHelper::AssetPaths.new(config, controller)
end
end
end
end

2
actionpack/lib/action_view/railtie.rb
View file

@ -23,7 +23,7 @@ module ActionView
initializer "action_view.cache_asset_ids" do |app|
unless app.config.cache_classes
ActiveSupport.on_load(:action_view) do
ActionView::Helpers::AssetTagHelper::AssetPaths.cache_asset_ids = false
ActionView::Helpers::AssetIdHelper.cache_asset_ids = false
end
end
end

36
actionpack/test/template/asset_tag_helper_test.rb
View file

@ -42,6 +42,7 @@ class AssetTagHelperTest < ActionView::TestCase
def protocol() 'http://' end
def ssl?() false end
def host_with_port() 'localhost' end
def base_url() 'http://www.example.com' end
end.new
@controller.request = @request
@ -602,7 +603,7 @@ class AssetTagHelperNonVhostTest < ActionView::TestCase
@controller = BasicController.new
@controller.config.relative_url_root = "/collaboration/hieraki"
@request = Struct.new(:protocol).new("gopher://")
@request = Struct.new(:protocol, :base_url).new("gopher://", "gopher://www.example.com")
@controller.request = @request
end
@ -617,10 +618,33 @@ class AssetTagHelperNonVhostTest < ActionView::TestCase
assert_dom_equal(%(/collaboration/hieraki/images/xml.png), image_path("xml.png"))
end
def test_should_return_nothing_if_asset_host_isnt_configured
assert_equal nil, compute_asset_host("foo")
end
def test_should_current_request_host_is_always_returned_for_request
assert_equal "gopher://www.example.com", compute_asset_host("foo", :protocol => :request)
end
def test_should_ignore_relative_root_path_on_complete_url
assert_dom_equal(%(http://www.example.com/images/xml.png), image_path("http://www.example.com/images/xml.png"))
end
def test_should_return_simple_string_asset_host
@controller.config.asset_host = "assets.example.com"
assert_equal "gopher://assets.example.com", compute_asset_host("foo")
end
def test_should_return_relative_asset_host
@controller.config.asset_host = "assets.example.com"
assert_equal "//assets.example.com", compute_asset_host("foo", :protocol => :relative)
end
def test_should_return_custom_protocol_asset_host
@controller.config.asset_host = "assets.example.com"
assert_equal "ftp://assets.example.com", compute_asset_host("foo", :protocol => "ftp")
end
def test_should_compute_proper_path_with_asset_host
@controller.config.asset_host = "assets.example.com"
assert_dom_equal(%(<link href="http://www.example.com/collaboration/hieraki" rel="alternate" title="RSS" type="application/rss+xml" />), auto_discovery_link_tag)
@ -653,6 +677,11 @@ class AssetTagHelperNonVhostTest < ActionView::TestCase
assert_dom_equal(%(gopher://assets.example.com/collaboration/hieraki/images/xml.png), image_url("xml.png"))
end
def test_should_return_asset_host_with_protocol
@controller.config.asset_host = "http://assets.example.com"
assert_equal "http://assets.example.com", compute_asset_host("foo")
end
def test_should_ignore_asset_host_on_complete_url
@controller.config.asset_host = "http://assets.example.com"
assert_dom_equal(%(<link href="http://bar.example.com/stylesheets/style.css" media="screen" rel="stylesheet" />), stylesheet_link_tag("http://bar.example.com/stylesheets/style.css"))
@ -663,6 +692,11 @@ class AssetTagHelperNonVhostTest < ActionView::TestCase
assert_dom_equal(%(<link href="//bar.example.com/stylesheets/style.css" media="screen" rel="stylesheet" />), stylesheet_link_tag("//bar.example.com/stylesheets/style.css"))
end
def test_should_wildcard_asset_host
@controller.config.asset_host = 'http://a%d.example.com'
assert_match(%r(http://a[0123].example.com), compute_asset_host("foo"))
end
def test_should_wildcard_asset_host_between_zero_and_four
@controller.config.asset_host = 'http://a%d.example.com'
assert_match(%r(http://a[0123].example.com/collaboration/hieraki/images/xml.png), image_path('xml.png'))