added apigee client id to middleware context

src/frontend/handlers.go

@@ -24,12 +24,11 @@ import (
 	"strconv"
 	"time"
 
+	pb "github.com/GoogleCloudPlatform/microservices-demo/src/frontend/genproto"
+	"github.com/GoogleCloudPlatform/microservices-demo/src/frontend/money"
 	"github.com/gorilla/mux"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
-
-	pb "github.com/GoogleCloudPlatform/microservices-demo/src/frontend/genproto"
-	"github.com/GoogleCloudPlatform/microservices-demo/src/frontend/money"
 )
 
 var (
@@ -353,6 +352,8 @@ func (fe *frontendServer) setCurrencyHandler(w http.ResponseWriter, r *http.Requ
 // TODO(phriscage) update for multiple config values
 func (fe *frontendServer) viewConfigHandler(w http.ResponseWriter, r *http.Request) {
 	log := r.Context().Value(ctxKeyLog{}).(logrus.FieldLogger)
+	log.Debug("Viewing the configuration")
+
 	currencies, err := fe.getCurrencies(r.Context())
 	if err != nil {
 		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve currencies"), http.StatusInternalServerError)

src/frontend/main.go

@@ -138,6 +138,7 @@ func main() {
 	var handler http.Handler = r
 	handler = &logHandler{log: log, next: handler} // add logging
 	handler = ensureSessionID(handler)             // add session ID
+	handler = ensureApigeeClientID(handler)        // add apigee client ID
 	handler = &ochttp.Handler{                     // add opencensus instrumentation
 		Handler:     handler,
 		Propagation: &b3.HTTPFormat{}}

src/frontend/middleware.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/sirupsen/logrus"
+	"google.golang.org/grpc/metadata"
 )
 
 type ctxKeyLog struct{}
@@ -103,3 +104,14 @@ func ensureSessionID(next http.Handler) http.HandlerFunc {
 		next.ServeHTTP(w, r)
 	}
 }
+
+// update context metadata with appropriate Apigee Authorization header
+func ensureApigeeClientID(next http.Handler) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var apigeeClientID string
+		apigeeClientID = currentApigeeClientID(r)
+		ctx := metadata.AppendToOutgoingContext(r.Context(), apigeeClientIDHeaderName, apigeeClientID)
+		r = r.WithContext(ctx)
+		next.ServeHTTP(w, r)
+	}
+}