AuthUtils.hpp

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#pragma once
 
#include "Poco/HexBinaryEncoder.h"
#include "Poco/JWT/Signer.h"
#include "Poco/JWT/Token.h"
#include "Poco/Net/HTTPServerRequest.h"
#include "Poco/SHA2Engine.h"
 
//-----------------------------------------------------
//
//-----------------------------------------------------
static inline std::string hashPassword(const std::string& password) {
    Poco::SHA2Engine sha256;
    sha256.update(password);
    const Poco::DigestEngine::Digest& digest = sha256.digest();
 
    std::stringstream ss;
    Poco::HexBinaryEncoder hexEncoder(ss);
    hexEncoder.write(reinterpret_cast<const char*>(&digest[0]), static_cast<long>(digest.size()));
    hexEncoder.close();
 
    return ss.str();
}
 
//-----------------------------------------------------
//
//-----------------------------------------------------
static inline bool verifyPassword(const std::string& password, const std::string& storedHash) {
    return hashPassword(password) == storedHash;
}
 
//-----------------------------------------------------
//
//-----------------------------------------------------
enum AuthClearance { NONE = 0, PUBLIC = 10, PRIVATE = 100, SECRET = 1000, TOP_SECRET = 10000, BLACK = 100000 };
 
//-----------------------------------------------------
//
//-----------------------------------------------------
struct AuthUtil {
    // Returns { sub, roles } on success; empty map on failure
    [[nodiscard]]
    static inline bool is_authorized(const Poco::Net::HTTPServerRequest& req,
                                     AuthClearance minClearance = AuthClearance::SECRET) {
        if (minClearance == AuthClearance::NONE)
            return true;  // no login required
        if (not req.has("Authorization"))
            return false;  // not logged in
 
        const auto auth = req.get("Authorization");
        const std::string bearer = "Bearer ";
 
        if (auth.rfind(bearer, 0) != 0)
            return false;
 
        // extract the token
        const std::string jwt = auth.substr(bearer.size());
 
        try {
            Poco::JWT::Signer signer("<secret>");
            Poco::JWT::Token token;
            signer.tryVerify(jwt, token);
 
            const auto& claims{token.payload()};
            for (const auto& claim : claims) {
                const auto& key{claim.first};
                const auto& value{claim.second};
 
                if (key == "prv") {
                    if (value.convert<int>() >= minClearance) {
                        return true;
                    } else {
                        return false;
                    }
                }
            }
        } catch (...) {
            return false;
        }
        return false;
    }
};