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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)
@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 do |(host, location, _, _)|
[host ? -host.size : NEGATIVE_INFINITY, -location.size]
end
end
def call(env)
path = env["PATH_INFO"]
script_name = env['SCRIPT_NAME']
hHost = env['HTTP_HOST']
sName = env['SERVER_NAME']
sPort = env['SERVER_PORT']
@mapping.each do |host, location, match, app|
unless hHost == host \
|| sName == host \
|| (!host && (hHost == sName || hHost == sName+':'+sPort))
next
end
next unless m = match.match(path.to_s)
rest = m[1]
next unless !rest || rest.empty? || rest[0] == ?/
env['SCRIPT_NAME'] = (script_name + location)
env['PATH_INFO'] = rest
return app.call(env)
end
[404, {"Content-Type" => "text/plain", "X-Cascade" => "pass"}, ["Not Found: #{path}"]]
ensure
env['PATH_INFO'] = path
env['SCRIPT_NAME'] = script_name
end
end
end
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