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
def initialize(map = {})
remap(map)
end
def remap(map)
@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('/')
[host, location, app]
}.sort_by { |(h, l, a)| [h ? -h.size : (-1.0 / 0.0), -l.size] } # Longest path first
end
def call(env)
path = env["PATH_INFO"].to_s.squeeze("/")
script_name = env['SCRIPT_NAME']
hHost, sName, sPort = env.values_at('HTTP_HOST','SERVER_NAME','SERVER_PORT')
@mapping.each { |host, location, app|
next unless (hHost == host || sName == host \
|| (host.nil? && (hHost == sName || hHost == sName+':'+sPort)))
next unless location == path[0, location.size]
next unless path[location.size] == nil || path[location.size] == ?/
return app.call(
env.merge(
'SCRIPT_NAME' => (script_name + location),
'PATH_INFO' => path[location.size..-1]))
}
[404, {"Content-Type" => "text/plain"}, ["Not Found: #{path}"]]
end
end
end
