webserv/src/core/util/contentNegotiator.js

a quick, flexible, fully typed development server

(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    function getAccepts(accepts) {
        return accepts.split(',').map((_) => {
            const [accept, quality = 1] = _.split(';q=');
            const [type, subtype] = accept.split('/');
            return {
                type,
                subtype,
                quality: typeof quality === 'number' ? quality : parseInt(quality, 10)
            };
        });
    }
    function contentNegotiator(handlers, defaultHandler) {
        return (accepts = '*/*') => {
            const list = getAccepts(accepts);
            let found = { handler: defaultHandler, quality: 0 };
            for (let { type, subtype, quality } of list) {
                for (let meta of handlers) {
                    if ((type === '*' || (type === meta.type && (subtype === '*' || subtype === meta.subtype))) &&
                        quality > found.quality) {
                        found = { handler: meta.handler, quality };
                    }
                    if (found.quality === 1) {
                        break;
                    }
                }
            }
            return found.handler;
        };
    }
    exports.contentNegotiator = contentNegotiator;
});
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