featurehub-javascript-client-sdk/lib/baggage_header.js

FeatureHub client/browser SDK

function createBaseBaggageHeader(header) {
    let newHeader = '';
    if (header) {
        newHeader = header.split(',').filter(p => !p.startsWith('fhub')).join(',');
    }
    return newHeader;
}
function createBaggageHeader(features, newHeader) {
    if (features.length > 0) {
        if (newHeader.length > 0) {
            return newHeader + ',fhub=' + features;
        }
        else {
            return 'fhub=' + features;
        }
    }
    else if (newHeader.length > 0) {
        return newHeader;
    }
    else {
        return undefined;
    }
}
export function w3cBaggageHeader({ repo, values, header }) {
    const newHeader = createBaseBaggageHeader(header);
    let features;
    if (values) {
        features = encodeURIComponent(Array.from(values)
            .map(e => e[0] + '=' + (e[1] ? encodeURIComponent(e[1]) : ''))
            .join(','));
    }
    else if (repo) {
        features = encodeURIComponent(Array.from(repo.simpleFeatures().entries())
            .map(e => e[0] + '=' + (e[1] ? encodeURIComponent(e[1]) : ''))
            .join(','));
    }
    else {
        return undefined;
    }
    return createBaggageHeader(features, newHeader);
}
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