Function baggageHeaderToObject

packages/core/src/utils/baggage.ts:113–140

* Will parse a baggage header, which is a simple key-value map, into a flat object. * * @param baggageHeader The baggage header to parse. * @returns a flat object containing all the key-value pairs from `baggageHeader`.

(baggageHeader: string)

 * @returns a flat object containing all the key-value pairs from `baggageHeader`.
 */
function baggageHeaderToObject(baggageHeader: string): Record<string, string> {
  return baggageHeader
    .split(',')
    .map(baggageEntry => {
      const eqIdx = baggageEntry.indexOf('=');
      if (eqIdx === -1) {
        // Likely an invalid entry
        return [];
      }
      const key = baggageEntry.slice(0, eqIdx);
      const value = baggageEntry.slice(eqIdx + 1);
      return [key, value].map(keyOrValue => {
        try {
          return decodeURIComponent(keyOrValue.trim());
        } catch {
          // We ignore errors here, e.g. if the value cannot be URL decoded.
          // This will then be skipped in the next step
          return;
        }
      });
    })
    .reduce<Record<string, string>>((acc, [key, value]) => {
      if (key && value) {
        acc[key] = value;
      }
      return acc;
    }, {});
}

/**
 * Turns a flat object (key-value pairs) into a baggage header, which is also just key-value pairs.