Mercurial > prosody-hg

annotate util/jwt.lua @ 10921:6eb5d2bb11af

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util-src: Use the luaL_pushfail API added in Lua 5.4 to highlight all failure conditions Actually just an alias of pushnil, but it does make it more obvious where the failure conditions are, which is good for readability.
author Kim Alvefur <zash@zash.se>
date Sun, 07 Jun 2020 02:25:56 +0200
parents c4ded3be7cc0
children d2f33b8fdc96
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10660
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
Kim Alvefur <zash@zash.se>
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1 local s_gsub = string.gsub;
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
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2 local json = require "util.json";
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3 local hashes = require "util.hashes";
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4 local base64_encode = require "util.encodings".base64.encode;
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5 local base64_decode = require "util.encodings".base64.decode;
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6
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7 local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" };
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8 local function b64url(data)
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9 return (s_gsub(base64_encode(data), "[+/=]", b64url_rep));
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10 end
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11 local function unb64url(data)
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12 return base64_decode(s_gsub(data, "[-_]", b64url_rep).."==");
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13 end
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14
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15 local static_header = b64url('{"alg":"HS256","typ":"JWT"}') .. '.';
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16
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17 local function sign(key, payload)
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18 local encoded_payload = json.encode(payload);
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19 local signed = static_header .. b64url(encoded_payload);
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20 local signature = hashes.hmac_sha256(key, signed);
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21 return signed .. "." .. b64url(signature);
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22 end
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23
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24 local jwt_pattern = "^(([A-Za-z0-9-_]+)%.([A-Za-z0-9-_]+))%.([A-Za-z0-9-_]+)$"
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25 local function verify(key, blob)
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26 local signed, bheader, bpayload, signature = string.match(blob, jwt_pattern);
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27 if not signed then
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28 return nil, "invalid-encoding";
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29 end
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30 local header = json.decode(unb64url(bheader));
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31 if not header or type(header) ~= "table" then
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32 return nil, "invalid-header";
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33 elseif header.alg ~= "HS256" then
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34 return nil, "unsupported-algorithm";
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35 end
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36 if b64url(hashes.hmac_sha256(key, signed)) ~= signature then
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37 return false, "signature-mismatch";
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38 end
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39 local payload, err = json.decode(unb64url(bpayload));
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40 if err ~= nil then
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41 return nil, "json-decode-error";
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42 end
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43 return true, payload;
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44 end
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45
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46 return {
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47 sign = sign;
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48 verify = verify;
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49 };
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50