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