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util/jwt.lua @ 11503:7adda14945ad
mod_http_file_share: Include expiry time of the upload itself in token
Lets an external upload service know this so it can do expiry itself.
Could possibly have been calculated based on the token expiry or
issuance time, explicit > implicit.
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 05 Apr 2021 17:21:18 +0200 |
parent | 10660:c4ded3be7cc0 |
child | 11561:d2f33b8fdc96 |
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local s_gsub = string.gsub; local json = require "util.json"; local hashes = require "util.hashes"; local base64_encode = require "util.encodings".base64.encode; local base64_decode = require "util.encodings".base64.decode; local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" }; local function b64url(data) return (s_gsub(base64_encode(data), "[+/=]", b64url_rep)); end local function unb64url(data) return base64_decode(s_gsub(data, "[-_]", b64url_rep).."=="); end local static_header = b64url('{"alg":"HS256","typ":"JWT"}') .. '.'; local function sign(key, payload) local encoded_payload = json.encode(payload); local signed = static_header .. b64url(encoded_payload); local signature = hashes.hmac_sha256(key, signed); return signed .. "." .. b64url(signature); end local jwt_pattern = "^(([A-Za-z0-9-_]+)%.([A-Za-z0-9-_]+))%.([A-Za-z0-9-_]+)$" local function verify(key, blob) local signed, bheader, bpayload, signature = string.match(blob, jwt_pattern); if not signed then return nil, "invalid-encoding"; end local header = json.decode(unb64url(bheader)); if not header or type(header) ~= "table" then return nil, "invalid-header"; elseif header.alg ~= "HS256" then return nil, "unsupported-algorithm"; end if b64url(hashes.hmac_sha256(key, signed)) ~= signature then return false, "signature-mismatch"; end local payload, err = json.decode(unb64url(bpayload)); if err ~= nil then return nil, "json-decode-error"; end return true, payload; end return { sign = sign; verify = verify; };