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skynet-webportal/docker/nginx/libs/skynet/skylink.lua

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local _M = {}
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local basexx = require("basexx")
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local hasher = require("hasher")
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-- use lowercase alphabet since our skylinks are part of urls
local base32_alphabet = "0123456789abcdefghijklmnopqrstuv"
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-- parse any skylink and return base64 version
function _M.base64(skylink)
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if string.len(skylink) == 55 then
local decoded = basexx.from_basexx(string.lower(skylink), base32_alphabet, 5)
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return basexx.to_url64(decoded)
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end
return skylink
end
-- parse any skylink and return base32 version
function _M.base32(skylink)
if string.len(skylink) == 46 then
local decoded = basexx.from_url64(skylink)
return basexx.to_basexx(decoded, base32_alphabet, 5)
end
return skylink
end
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-- hash skylink into 32 bytes hash used in blocklist
function _M.hash(skylink)
-- ensure that the skylink is base64 encoded
local base64Skylink = _M.base64(skylink)
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-- decode skylink from base64 encoding
local rawSkylink = basexx.from_url64(base64Skylink)
-- drop first two bytes and leave just merkle root
local rawMerkleRoot = string.sub(rawSkylink, 3)
-- parse with blake2b with key length of 32
local blake2bHashed = hasher.blake2b(rawMerkleRoot, 32)
-- hex encode the blake hash
local hexHashed = basexx.to_hex(blake2bHashed)
-- lowercase the hex encoded hash
local lowerHexHashed = string.lower(hexHashed)
return lowerHexHashed
end
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return _M