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| | module Rack
# Rack::URLMap takes a hash mapping urls or paths to apps, and
# dispatches accordingly. Support for HTTP/1.1 host names exists if
# the URLs start with <tt>http://</tt> or <tt>https://</tt>.
#
# URLMap modifies the SCRIPT_NAME and PATH_INFO such that the part
# relevant for dispatch is in the SCRIPT_NAME, and the rest in the
# PATH_INFO. This should be taken care of when you need to
# reconstruct the URL in order to create links.
#
# URLMap dispatches in such a way that the longest paths are tried
# first, since they are most specific.
class URLMap
NEGATIVE_INFINITY = -1.0 / 0.0
def initialize(map = {})
remap(map)
end
def remap(map)
longest_path_first = lambda do |(host, location, _, _)|
[host ? -host.size : NEGATIVE_INFINITY, -location.size]
end
@mapping = map.map { |location, app|
if location =~ %r{\Ahttps?://(.*?)(/.*)}
host, location = $1, $2
else
host = nil
end
unless location[0] == ?/
raise ArgumentError, "paths need to start with /"
end
location = location.chomp('/')
match = Regexp.new("^#{Regexp.quote(location).gsub('/', '/+')}(.*)", nil, 'n')
[host, location, match, app]
}.sort_by(&longest_path_first)
end
def call(env)
path = env["PATH_INFO"]
script_name = env['SCRIPT_NAME']
hHost, sName, sPort = env.values_at('HTTP_HOST','SERVER_NAME','SERVER_PORT')
@mapping.each { |host, location, match, app|
next unless (hHost == host || sName == host \
|| (host.nil? && (hHost == sName || hHost == sName+':'+sPort)))
next unless path.to_s =~ match && rest = $1
next unless rest.empty? || rest[0] == ?/
env.merge!('SCRIPT_NAME' => (script_name + location), 'PATH_INFO' => rest)
return app.call(env)
}
[404, {"Content-Type" => "text/plain", "X-Cascade" => "pass"}, ["Not Found: #{path}"]]
ensure
env.merge! 'PATH_INFO' => path, 'SCRIPT_NAME' => script_name
end
end
end
|