Validator.h

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/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/SmingHub/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * Validator.h
 *
 * @author: 2018 - Slavey Karadzhov <slav@attachix.com>
 *
 ****/
 
#pragma once
 
#include <Delegate.h>
#include "Certificate.h"
#include "Fingerprints.h"
 
namespace Ssl
{
class Validator
{
public:
    virtual ~Validator() = default;
 
    virtual bool validate(const Certificate& certificate) = 0;
};
 
template <class FP> class FingerprintValidator : public Validator
{
public:
    FingerprintValidator(const FP& fingerprint) : fp(fingerprint)
    {
    }
 
    bool validate(const Certificate& certificate) override
    {
        FP certFp;
        if(!certificate.getFingerprint(FP::type, reinterpret_cast<Fingerprint&>(certFp))) {
            // Fingerprint not available
            return false;
        }
 
        return certFp.hash == fp.hash;
    }
 
private:
    FP fp;
};
 
using ValidatorCallback = Delegate<bool(const Certificate* certificate, void* data)>;
 
class CallbackValidator : public Validator
{
public:
    CallbackValidator(ValidatorCallback callback, void* param) : callback(callback), param(param)
    {
    }
 
    ~CallbackValidator()
    {
        // If callback hasn't been invoked yet, do it now to release any allocated memory
        if(callback) {
            callback(nullptr, param);
        }
    }
 
    bool validate(const Certificate& certificate) override
    {
        bool res = callback ? callback(&certificate, param) : false;
        // Only invoke the callback once
        callback = nullptr;
        return res;
    }
 
private:
    ValidatorCallback callback;
    void* param;
};
 
} // namespace Ssl