Xiami 地址加密的算法

remain_str = "hFaF4%52pt%m155E43t2i14E39pF.75261%fn68_1931e88121A.t%%779%x%2274.2i2FF%_m"
store      = ["hFaF4%52p", "t%m155E43"]
store      = ["hFaF4%52p", "t%m155E43", "t2i14E39", "pF.75261", "%fn68_19", "31e88121", "A.t%%779", "%x%2274.", "2i2FF%_m"]
address    = "http%3A%2F%2Ff1.xiami.net%2F11768%2F454588%2F%5E2_177%5E361274_2491919.mp3"
address    = "http://f1.xiami.net/11768/454588/^2_177^361274_2491919.mp3"
address    = "http://f1.xiami.net/11768/454588/02_1770361274_2491919.mp3"



total      = location[0].to_i
remain_str = location[1..-1]
span       = (remain_str.length.to_f / total).floor
remainder  = remain_str.length % total
store       = []
address    = ""
# remain_str = "hFaF4%52pt%m155E43t2i14E39pF.75261%fn68_1931e88121A.t%%779%x%2274.2i2FF%_m"

remainder.times do |i|
  store[i] = remain_str[(span+1)*i...(span+1)*(i+1)]
end
# store      = ["hFaF4%52p", "t%m155E43"]

remainder.upto(total-1) do |i|
  index    = span*(i-remainder)+(span+1)*remainder
  length   = span
  store[i] = remain_str[index...index+length]
end
# store = ["hFaF4%52p", "t%m155E43", "t2i14E39", "pF.75261", "%fn68_19", "31e88121", "A.t%%779", "%x%2274.", "2i2FF%_m"]

# Take out every first char in store[i],
# Then take out every second char in store[i],
# Then cons together.
(span+1).times { |col| address << store.collect { |row| row[col] }.join }
# address = "http%3A%2F%2Ff1.xiami.net%2F11768%2F454588%2F%5E2_177%5E361274_2491919.mp3"

# unEscape string
# address = "http://f1.xiami.net/11768/454588/^2_177^361274_2491919.mp3"
# address = "http://f1.xiami.net/11768/454588/02_1770361274_2491919.mp3"
address = CGI::unescape(address).gsub('^', '0')
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