Lua脚本获取喜马拉雅MP3音频地址

#!/usr/bin/lua5.1
--需要luacurl http://luacurl.luaforge.net/
--luajson https://github.com/mbalmer/luajson
require("luacurl")
require('json')
 
 
function get_html(url, c)
local result = { }
if c == nil then
c = curl.new()
end
c:setopt(curl.OPT_URL, url)
c:setopt(curl.OPT_WRITEDATA, result)
c:setopt(curl.OPT_WRITEFUNCTION, function(tab, buffer) --call back函数，必须有
table.insert(tab, buffer) --tab参数即为result，参考http://luacurl.luaforge.net/
 
return #buffer
end)
local ok = c:perform()
return ok, table.concat(result) --此table非上一个table，作用域不同
end
 
 
function downMp3(id)
 
local url="http://www.ximalaya.com/tracks/"..id..".json"
local mp3 = "http://fdfs.xmcdn.com/"
local ok,html = get_html(url)
if ok then
local result = json.decode(html)
print(mp3..result.play_path_64)
else
print("error")
end
end
if arg[1] and tonumber(arg[1]) then
downMp3(arg[1])
else
print("请输入编号")
end