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/***
This file is part of snapcast
Copyright (C) 2014-2025 Johannes Pohl
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
#pragma once
// local headers
#include "common/json.hpp"
// standard headers
#include <chrono>
#include <optional>
#include <string>
/*
https://datatracker.ietf.org/doc/html/rfc7518#section-3
+--------------+-------------------------------+--------------------+
| "alg" Param | Digital Signature or MAC | Implementation |
| Value | Algorithm | Requirements |
+--------------+-------------------------------+--------------------+
| HS256 | HMAC using SHA-256 | Required |
| HS384 | HMAC using SHA-384 | Optional |
| HS512 | HMAC using SHA-512 | Optional |
| RS256 | RSASSA-PKCS1-v1_5 using | Recommended |
| | SHA-256 | |
| RS384 | RSASSA-PKCS1-v1_5 using | Optional |
| | SHA-384 | |
| RS512 | RSASSA-PKCS1-v1_5 using | Optional |
| | SHA-512 | |
| ES256 | ECDSA using P-256 and SHA-256 | Recommended+ |
| ES384 | ECDSA using P-384 and SHA-384 | Optional |
| ES512 | ECDSA using P-521 and SHA-512 | Optional |
| PS256 | RSASSA-PSS using SHA-256 and | Optional |
| | MGF1 with SHA-256 | |
| PS384 | RSASSA-PSS using SHA-384 and | Optional |
| | MGF1 with SHA-384 | |
| PS512 | RSASSA-PSS using SHA-512 and | Optional |
| | MGF1 with SHA-512 | |
| none | No digital signature or MAC | Optional |
| | performed | |
+--------------+-------------------------------+--------------------+
https://auth0.com/docs/secure/tokens/json-web-tokens/json-web-token-claims
Registered claims
The JWT specification defines seven reserved claims that are not required, but are recommended to allow interoperability with third-party applications. These
are:
- iss (issuer): Issuer of the JWT
- sub (subject): Subject of the JWT (the user)
- aud (audience): Recipient for which the JWT is intended
- exp (expiration time): Time after which the JWT expires
- nbf (not before time): Time before which the JWT must not be accepted for processing
- iat (issued at time): Time at which the JWT was issued; can be used to determine age of the JWT
- jti (JWT ID): Unique identifier; can be used to prevent the JWT from being replayed (allows a token to be used only once)
// https://techdocs.akamai.com/iot-token-access-control/docs/generate-jwt-rsa-keys
*/
using json = nlohmann::json;
/// Json Web Token in RS256 format
class Jwt
{
public:
/// c'tor
Jwt();
/// Parse an base64 url encoded token of the form "<header>.<payload>.<signature>"
/// @param token The token
/// @param pem_cert Certificate in PEM format to verify the signature
/// @return true on success, else false
bool parse(const std::string& token, const std::string& pem_cert);
/// Create an base64 url encoded token of the form "<header>.<payload>.<signature>"
/// @param pem_key Private key in PEM format to sign the token
/// @return the token or nullopt if failed
std::optional<std::string> getToken(const std::string& pem_key) const;
/// Get the iat "Issued at time" claim
/// @return the claim or nullopt, if not present
std::optional<std::chrono::system_clock::time_point> getIat() const;
/// Set the iat "Issued at time" claim, use nullopt to delete the iat
void setIat(const std::optional<std::chrono::system_clock::time_point>& iat);
/// Get the exp "Expiration time" claim
/// @return the claim or nullopt, if not present
std::optional<std::chrono::system_clock::time_point> getExp() const;
/// Set the exp "Expiration time" claim, use nullopt to delete the exp
void setExp(const std::optional<std::chrono::system_clock::time_point>& exp);
/// Get the sub "Subject" claim
/// @return the claim or nullopt, if not present
std::optional<std::string> getSub() const;
/// Set the sub "Subject" claim, use nullopt to delete the sub
void setSub(const std::optional<std::string>& sub);
/// The token's raw payload (claims) in json format
json claims;
};
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