@whook/whook/dist/libs/headers.js

Build strong and efficient REST web services.

import { YError } from 'yerror';
import { identity } from './utils.js';
export function mergeVaryHeaders(baseHeader, addedValue) {
    if (addedValue.includes(',')) {
        throw new YError('E_BAD_VARY_VALUE', addedValue);
    }
    const baseHeaderValues = (baseHeader instanceof Array ? baseHeader : [baseHeader])
        .map((value) => value
        .split(',')
        .filter(identity)
        .map((v) => v.trim().toLowerCase()))
        .reduce((allValues, values) => [...allValues, ...values], []);
    if (baseHeaderValues.includes('*') || addedValue.trim() === '*') {
        return '*';
    }
    return [
        ...new Set([...baseHeaderValues, addedValue.trim().toLowerCase()].filter(identity)),
    ].join(', ');
}
export function lowerCaseHeaders(object) {
    return Object.keys(object).reduce((finalObject, key) => ({
        ...finalObject,
        [key.toLowerCase()]: object[key],
    }), {});
}
/**
 * Pick the first header value if exists
 * @function
 * @param  {string} name
 * The header name
 * @param  {Object} headers
 * The headers map
 * @return {string}
 * The value if defined.
 */
export function pickFirstHeaderValue(name, headers) {
    return pickAllHeaderValues(name, headers)[0];
}
/**
 * Pick header values
 * @function
 * @param  {string} name
 * The header name
 * @param  {Object} headers
 * The headers map
 * @return {Array}
 * The values in an array.
 */
export function pickAllHeaderValues(name, headers) {
    const headerValues = headers && typeof headers[name] === 'undefined'
        ? []
        : typeof headers[name] === 'string'
            ? [headers[name]]
            : headers[name];
    return headerValues;
}
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