@mojojs/core/lib/mime.js

Real-time web framework

import mime from 'mime-types';
/**
 * MIME class.
 */
export class Mime {
    constructor() {
        /**
         * Custom MIME types.
         */
        this.custom = {
            html: 'text/html; charset=utf-8',
            json: 'application/json; charset=utf-8',
            txt: 'text/plain; charset=utf-8',
            yaml: 'text/yaml; charset=utf-8'
        };
        this._reverseCustom = undefined;
    }
    /**
     * Detect file extensions from `Accept` header value.
     */
    detect(accepts) {
        if (this._reverseCustom === undefined) {
            this._reverseCustom = {};
            for (const [name, value] of Object.entries(this.custom)) {
                const match = value.match(/^\s*([^,; ]+)/);
                if (match !== null)
                    this._reverseCustom[match[1]] = name;
            }
        }
        const reverse = this._reverseCustom;
        const types = {};
        for (const accept of accepts.split(/\s*,\s*/)) {
            const match = accept.match(/^\s*([^,; ]+)(?:\s*;\s*q\s*=\s*(\d+(?:\.\d+)?))?\s*$/i);
            if (match === null)
                continue;
            types[match[1].toLowerCase()] = parseFloat(match[2] ?? 1);
        }
        const exts = [];
        for (const type of Object.keys(types).sort((a, b) => types[b] - types[a])) {
            const ext = reverse[type] ?? mime.extension(type);
            if (typeof ext === 'string')
                exts.push(ext);
        }
        return exts;
    }
    /**
     * Get MIME type for file extension.
     */
    extType(ext) {
        return this.custom[ext] ?? mime.types[ext] ?? null;
    }
}
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