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util/jwt.lua @ 12580:a9dbf657c894 0.12
util.datamapper: Improve handling of schemas with non-obvious "type"
The JSON Schema specification says that schemas are objects or booleans,
and that the 'type' property is optional and can be an array.
This module previously allowed bare type names as schemas and did not
really handle booleans.
It now handles missing 'type' properties and boolean 'true' as a schema.
Objects and arrays are guessed based on the presence of 'properties' or
'items' field.
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 08 Jul 2022 17:32:48 +0200 |
parent | 11561:d2f33b8fdc96 |
child | 12696:27a72982e331 |
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local s_gsub = string.gsub; local json = require "util.json"; local hashes = require "util.hashes"; local base64_encode = require "util.encodings".base64.encode; local base64_decode = require "util.encodings".base64.decode; local secure_equals = require "util.hashes".equals; local b64url_rep = { ["+"] = "-", ["/"] = "_", ["="] = "", ["-"] = "+", ["_"] = "/" }; local function b64url(data) return (s_gsub(base64_encode(data), "[+/=]", b64url_rep)); end local function unb64url(data) return base64_decode(s_gsub(data, "[-_]", b64url_rep).."=="); end local static_header = b64url('{"alg":"HS256","typ":"JWT"}') .. '.'; local function sign(key, payload) local encoded_payload = json.encode(payload); local signed = static_header .. b64url(encoded_payload); local signature = hashes.hmac_sha256(key, signed); return signed .. "." .. b64url(signature); end local jwt_pattern = "^(([A-Za-z0-9-_]+)%.([A-Za-z0-9-_]+))%.([A-Za-z0-9-_]+)$" local function verify(key, blob) local signed, bheader, bpayload, signature = string.match(blob, jwt_pattern); if not signed then return nil, "invalid-encoding"; end local header = json.decode(unb64url(bheader)); if not header or type(header) ~= "table" then return nil, "invalid-header"; elseif header.alg ~= "HS256" then return nil, "unsupported-algorithm"; end if not secure_equals(b64url(hashes.hmac_sha256(key, signed)), signature) then return false, "signature-mismatch"; end local payload, err = json.decode(unb64url(bpayload)); if err ~= nil then return nil, "json-decode-error"; end return true, payload; end return { sign = sign; verify = verify; };