prosody
a086825ed73a
util/jwt.lua

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util/jwt.lua @ 11026:a086825ed73a

util.dataforms: Convert media element sizes to avoid error on Lua 5.3 The stanza API does not accept number values and threw an error due to the height and width attributes of the media element (XEP-0221). This part had no test coverage previously, explaining why it was not discovered until now.
author Kim Alvefur <zash@zash.se>
date Sun, 16 Aug 2020 12:55:55 +0200
parent 10660:c4ded3be7cc0
child 11561:d2f33b8fdc96
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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50