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Annotate
util/jwt.lua @ 11145:be73df6765b9
core.modulemanager: Locate resources of LuaRocks-installed modules
Extra non-code files included with a `copy_directories` directive in a
LuaRocks manifest will be copied into a per-module and per-version
directory under /lib/luarocks/ and all this is there to dig that out so
it can be used in e.g. moduleapi :load_resource().
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Wed, 07 Oct 2020 15:51:37 +0200 |
| parent | 10660:c4ded3be7cc0 |
| child | 11561:d2f33b8fdc96 |
| rev | line source |
|---|---|
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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 |
