64 lines
2.2 KiB
Lua
64 lines
2.2 KiB
Lua
local _M = {}
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function _M.reload()
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local httpc = require("resty.http").new()
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-- fetch blocklist records (all blocked skylink hashes)
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-- 10.10.10.10 points to sia service (alias not available when using resty-http)
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local res, err = httpc:request_uri("http://10.10.10.10:9980/skynet/blocklist", {
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headers = {
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["User-Agent"] = "Sia-Agent",
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}
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})
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-- fail whole request in case this request failed, we want to make sure
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-- the blocklist is pre cached before serving first skylink
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if err or (res and res.status ~= ngx.HTTP_OK) then
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ngx.log(ngx.ERR, "Failed skyd service request /skynet/blocklist: ", err or ("[HTTP " .. res.status .. "] " .. res.body))
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ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status
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ngx.header["content-type"] = "text/plain"
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ngx.say(err or res.body)
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return ngx.exit(ngx.status)
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elseif res and res.status == ngx.HTTP_OK then
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local json = require('cjson')
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local data = json.decode(res.body)
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-- mark all existing entries as expired
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ngx.shared.blocklist:flush_all()
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-- set all cache entries one by one (resets expiration)
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for i, hash in ipairs(data.blocklist) do
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ngx.shared.blocklist:set(hash, true)
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end
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-- ensure that init flag is persisted
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ngx.shared.blocklist:set("__init", true)
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-- remove all leftover expired entries
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ngx.shared.blocklist:flush_expired()
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end
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end
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function _M.is_blocked(skylink)
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-- make sure that blocklist has been preloaded
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if not ngx.shared.blocklist:get("__init") then _M.reload() end
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-- hash skylink before comparing it with blocklist
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local hash = require("skynet.skylink").hash(skylink)
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-- we need to use get_stale because we are expiring previous
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-- entries when the blocklist is reloading and we still want
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-- to block them until the reloading is finished
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return ngx.shared.blocklist:get_stale(hash) == true
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end
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-- exit with 416 illegal content status code
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function _M.exit_illegal()
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ngx.status = ngx.HTTP_ILLEGAL
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ngx.header["content-type"] = "text/plain"
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ngx.say("Unavailable For Legal Reasons")
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return ngx.exit(ngx.status)
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end
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return _M
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