prosody
7adda14945ad
util/jwt.lua

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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>
date Mon, 05 Apr 2021 17:21:18 +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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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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