Mercurial > prosody-hg

annotate util/jwt.lua @ 10946:84441c19750e

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mod_register_ibr: Add event for successful password reset This is in addition to the existing event for password changes. This one includes additional details about the actor, and only triggers when the change is due to the account owner (presumably) resetting. As example use case is to invalidate one-time password reset tokens.
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Jun 2020 11:35:24 +0100
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
c4ded3be7cc0 util.jwt: Basic JSON Web Token library supporting HS256 tokens
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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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