@chubbyts/chubbyts-negotiation/dist/content-type-negotiator.js

A simple negotiation library.

import { resolveHeaderToMap } from './negotiation.js';
const compareMediaTypeWithSuffix = (supportedValues, mediaType, attributes) => {
    const mediaTypeParts = mediaType.match(/([^/]+)\/([^+]+)\+(.+)/);
    if (null === mediaTypeParts) {
        return undefined;
    }
    const mediaTypeFromParts = mediaTypeParts[1] + '/' + mediaTypeParts[3];
    if (-1 !== supportedValues.indexOf(mediaTypeFromParts)) {
        return { value: mediaTypeFromParts, attributes };
    }
};
const compareMediaTypes = (supportedValues, headerToMap) => {
    const entries = Array.from(headerToMap.entries());
    if (entries.length !== 1) {
        return undefined;
    }
    const [mediaType, attributes] = entries[0];
    const { q: _, ...otherAttriutes } = attributes;
    if (-1 !== supportedValues.indexOf(mediaType)) {
        return { value: mediaType, attributes: otherAttriutes };
    }
    return compareMediaTypeWithSuffix(supportedValues, mediaType, otherAttriutes);
};
export const createContentTypeNegotiator = (supportedValues) => {
    return {
        negotiate: (header) => {
            const headerToMap = resolveHeaderToMap(header);
            return compareMediaTypes(supportedValues, headerToMap);
        },
        supportedValues,
    };
};