prosody
77f2d45799ed
util/jwt.lua

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util/jwt.lua @ 11493:77f2d45799ed

mod_http_file_share: Fix reporting of missing files This just gave an unhelpful 500 error. It would be nice to have some wrapper code that could untangle the embedded filename in the io libs errors.
author Kim Alvefur <zash@zash.se>
date Sun, 28 Mar 2021 13:51:06 +0200
parent 10660:c4ded3be7cc0
child 11561:d2f33b8fdc96
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10660
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
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1 local s_gsub = string.gsub;
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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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