--- /dev/null
+module Rack
+ module Auth
+ module Digest
+ class Params < Hash
+
+ def self.parse(str)
+ split_header_value(str).inject(new) do |header, param|
+ k, v = param.split('=', 2)
+ header[k] = dequote(v)
+ header
+ end
+ end
+
+ def self.dequote(str) # From WEBrick::HTTPUtils
+ ret = (/\A"(.*)"\Z/ =~ str) ? $1 : str.dup
+ ret.gsub!(/\\(.)/, "\\1")
+ ret
+ end
+
+ def self.split_header_value(str)
+ str.scan( /(\w+\=(?:"[^\"]+"|[^,]+))/n ).collect{ |v| v[0] }
+ end
+
+ def initialize
+ super
+
+ yield self if block_given?
+ end
+
+ def [](k)
+ super k.to_s
+ end
+
+ def []=(k, v)
+ super k.to_s, v.to_s
+ end
+
+ UNQUOTED = ['qop', 'nc', 'stale']
+
+ def to_s
+ inject([]) do |parts, (k, v)|
+ parts << "#{k}=" + (UNQUOTED.include?(k) ? v.to_s : quote(v))
+ parts
+ end.join(', ')
+ end
+
+ def quote(str) # From WEBrick::HTTPUtils
+ '"' << str.gsub(/[\\\"]/o, "\\\1") << '"'
+ end
+
+ end
+ end
+ end
+end
+