verdaccio
Version:
A lightweight private npm proxy registry
38 lines (37 loc) • 4.24 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.getByQualityPriorityValue = getByQualityPriorityValue;
/**
* Quality values, or q-values and q-factors, are used to describe the order
* of priority of values in a comma-separated list.
* It is a special syntax allowed in some HTTP headers and in HTML.
* https://developer.mozilla.org/en-US/docs/Glossary/Quality_values
* @param headerValue
*/
function getByQualityPriorityValue(headerValue) {
if (typeof headerValue !== 'string') {
return '';
}
const split = headerValue.split(',');
if (split.length <= 1) {
const qList = split[0].split(';');
return qList[0];
}
let [header] = split.reduce((acc, item) => {
const qList = item.split(';');
if (qList.length > 1) {
const [accept, q] = qList;
const [, query] = q.split('=');
acc.push([accept.trim(), query ? query : 0]);
} else {
acc.push([qList[0], 0]);
}
return acc;
}, []).sort(function (a, b) {
return b[1] - a[1];
});
return header[0];
}
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