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method

process

Importance_0
process(challenge) public

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# File lib/net/imap.rb, line 3360
      def process(challenge)
        case @stage
        when STAGE_ONE
          @stage = STAGE_TWO
          sparams = {}
          c = StringScanner.new(challenge)
          while c.scan(/(?:\s*,)?\s*(\w+)=("(?:[^\\"]+|\\.)*"|[^,]+)\s*/)
            k, v = c[1], c[2]
            if v =~ /^"(.*)"$/
              v = $1
              if v =~ /,/
                v = v.split(',')
              end
            end
            sparams[k] = v
          end

          raise DataFormatError, "Bad Challenge: '#{challenge}'" unless c.rest.size == 0
          raise Error, "Server does not support auth (qop = #{sparams['qop'].join(',')})" unless sparams['qop'].include?("auth")

          response = {
            :nonce => sparams['nonce'],
            :username => @user,
            :realm => sparams['realm'],
            :cnonce => Digest::MD5.hexdigest("%.15f:%.15f:%d" % [Time.now.to_f, rand, Process.pid.to_s]),
            :'digest-uri' => 'imap/' + sparams['realm'],
            :qop => 'auth',
            :maxbuf => 65535,
            :nc => "%08d" % nc(sparams['nonce']),
            :charset => sparams['charset'],
          }

          response[:authzid] = @authname unless @authname.nil?

          # now, the real thing
          a0 = Digest::MD5.digest( [ response.values_at(:username, :realm), @password ].join(':') )

          a1 = [ a0, response.values_at(:nonce,:cnonce) ].join(':')
          a1 << ':' + response[:authzid] unless response[:authzid].nil?

          a2 = "AUTHENTICATE:" + response[:'digest-uri']
          a2 << ":00000000000000000000000000000000" if response[:qop] and response[:qop] =~ /^auth-(?:conf|int)$/

          response[:response] = Digest::MD5.hexdigest(
            [
             Digest::MD5.hexdigest(a1),
             response.values_at(:nonce, :nc, :cnonce, :qop),
             Digest::MD5.hexdigest(a2)
            ].join(':')
          )

          return response.keys.map {|key| qdval(key.to_s, response[key]) }.join(',')
        when STAGE_TWO
          @stage = nil
          # if at the second stage, return an empty string
          if challenge =~ /rspauth=/
            return ''
          else
            raise ResponseParseError, challenge
          end
        else
          raise ResponseParseError, challenge
        end
      end
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