聊聊dubbo-go的ProviderAuthFilter

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本文主要研究一下dubbo-go的ProviderAuthFilter

ProviderAuthFilter

dubbo-go-v1.4.2/filter/filter_impl/auth/provider_auth.go

type ProviderAuthFilter struct {
}

func init() {
	extension.SetFilter(constant.PROVIDER_AUTH_FILTER, getProviderAuthFilter)
}

getProviderAuthFilter

dubbo-go-v1.4.2/filter/filter_impl/auth/provider_auth.go

func getProviderAuthFilter() filter.Filter {
	return &ProviderAuthFilter{}
}

Invoke

dubbo-go-v1.4.2/filter/filter_impl/auth/provider_auth.go

func (paf *ProviderAuthFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result {
	logger.Infof("invoking providerAuth filter.")
	url := invoker.GetUrl()

	err := doAuthWork(&url, func(authenticator filter.Authenticator) error {
		return authenticator.Authenticate(invocation, &url)
	})
	if err != nil {
		logger.Infof("auth the request: %v occur exception, cause: %s", invocation, err.Error())
		return &protocol.RPCResult{
			Err: err,
		}
	}

	return invoker.Invoke(ctx, invocation)
}

OnResponse

dubbo-go-v1.4.2/filter/filter_impl/auth/default_authenticator.go

func (paf *ProviderAuthFilter) OnResponse(ctx context.Context, result protocol.Result, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result {
	return result
}

doAuthWork

dubbo-go-v1.4.2/filter/filter_impl/auth/default_authenticator.go

func doAuthWork(url *common.URL, do func(filter.Authenticator) error) error {

	shouldAuth := url.GetParamBool(constant.SERVICE_AUTH_KEY, false)
	if shouldAuth {
		authenticator := extension.GetAuthenticator(url.GetParam(constant.AUTHENTICATOR_KEY, constant.DEFAULT_AUTHENTICATOR))
		return do(authenticator)
	}
	return nil
}

Authenticate

dubbo-go-v1.4.2/filter/filter_impl/auth/default_authenticator.go

func (authenticator *DefaultAuthenticator) Authenticate(invocation protocol.Invocation, url *common.URL) error {
	accessKeyId := invocation.AttachmentsByKey(constant.AK_KEY, "")

	requestTimestamp := invocation.AttachmentsByKey(constant.REQUEST_TIMESTAMP_KEY, "")
	originSignature := invocation.AttachmentsByKey(constant.REQUEST_SIGNATURE_KEY, "")
	consumer := invocation.AttachmentsByKey(constant.CONSUMER, "")
	if IsEmpty(accessKeyId, false) || IsEmpty(consumer, false) ||
		IsEmpty(requestTimestamp, false) || IsEmpty(originSignature, false) {
		return errors.New("failed to authenticate your ak/sk, maybe the consumer has not enabled the auth")
	}

	accessKeyPair, err := getAccessKeyPair(invocation, url)
	if err != nil {
		return errors.New("failed to authenticate , can't load the accessKeyPair")
	}

	computeSignature, err := getSignature(url, invocation, accessKeyPair.SecretKey, requestTimestamp)
	if err != nil {
		return err
	}
	if success := computeSignature == originSignature; !success {
		return errors.New("failed to authenticate, signature is not correct")
	}
	return nil
}

小结

ProviderAuthFilter的Invoke方法通过doAuthWork来进行auth,其传递的func执行authenticator.Authenticate(invocation, &url)

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