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util/jwt.lua @ 11056:0b0a42542456
util.jid: Fix special escaping of '\' per XEP-0106
From XEP-0106 §2. Requirements:
> in certain circumstances, the escaping character itself ("\") might
> also be escaped
Later in §4.2 Address Transformation Algorithm it is stated that the
backslash would only be escaped if it forms an escape sequence. Thus
'\foo' is unaltered but '\20' must be escaped into '\5c20'.
Thanks to lovetox and jonas’ for brining up.
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 28 Aug 2020 18:44:02 +0200 |
parent | 10660:c4ded3be7cc0 |
child | 11561:d2f33b8fdc96 |
rev | line source |
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10660
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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 |