feat: decode jaeger header (open-telemetry#735)

* feat: decode jaeger header

* fix: gts fix

* fix: use const instead of variables

* fix: use const for headers

Co-authored-by: Uladzislau Kiva <[email protected]>
Co-authored-by: Daniel Dyla <[email protected]>

Author: 3 people

packages/opentelemetry-propagator-jaeger/src/JaegerHttpTraceFormat.ts

@@ -86,7 +86,7 @@ export class JaegerHttpTraceFormat implements HttpTextFormat {
  * @return {SpanContext} - returns a span context represented by the serializedString.
  **/
 function deserializeSpanContext(serializedString: string): SpanContext | null {
-  let headers = serializedString.split(':');
+  const headers = decodeURIComponent(serializedString).split(':');
   if (headers.length !== 4) {
     return null;
   }

packages/opentelemetry-propagator-jaeger/test/JaegerHttpTraceFormat.test.ts

@@ -88,6 +88,19 @@ describe('JaegerHttpTraceFormat', () => {
       });
     });
 
+    it('should extract context of a sampled span from UTF-8 encoded carrier', () => {
+      carrier[UBER_TRACE_ID_HEADER] =
+        'ac1f3dc3c2c0b06e%3A5ac292c4a11a163e%3Ac086aaa825821068%3A1';
+      const extractedSpanContext = jaegerHttpTraceFormat.extract('', carrier);
+
+      assert.deepStrictEqual(extractedSpanContext, {
+        spanId: '5ac292c4a11a163e',
+        traceId: 'ac1f3dc3c2c0b06e',
+        isRemote: true,
+        traceFlags: TraceFlags.SAMPLED,
+      });
+    });
+
     it('should use custom header if provided', () => {
       carrier[customHeader] =
         'd4cda95b652f4a1592b449d5929fda1b:6e0c63257de34c92:0:01';