@chubbyts/chubbyts-api/dist/middleware/accept-language-negotiation-middleware.js

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import { createNotAcceptable } from '@chubbyts/chubbyts-http-error/dist/http-error';
export const createAcceptLanguageNegotiationMiddleware = (acceptLanguageNegotiator) => {
    return async (request, handler) => {
        if (typeof request.headers['accept-language'] === 'undefined') {
            const supportedValues = acceptLanguageNegotiator.supportedValues;
            throw createNotAcceptable({
                detail: `Missing accept-language: "${supportedValues.join('", "')}"`,
                supportedValues,
            });
        }
        const negotiatedValue = acceptLanguageNegotiator.negotiate(request.headers['accept-language'].join(','));
        if (!negotiatedValue) {
            const supportedValues = acceptLanguageNegotiator.supportedValues;
            throw createNotAcceptable({
                detail: `Allowed accept-languages: "${supportedValues.join('", "')}"`,
                supportedValues,
            });
        }
        return handler({
            ...request,
            attributes: { ...request.attributes, 'accept-language': negotiatedValue.value },
        });
    };
};