fix: encoded urn not matched properly to routes (#21)

* fix: encoded urn not matched properly to routes

* feat(router): log if url cannot be decoded

api/middlewares.go

@@ -0,0 +1,29 @@
+package api
+
+import (
+	"net/http"
+	"net/url"
+
+	"github.com/gorilla/mux"
+	"github.com/sirupsen/logrus"
+)
+
+func decodeURLMiddleware(logger logrus.FieldLogger) mux.MiddlewareFunc {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+			newVars := map[string]string{}
+			for key, val := range mux.Vars(r) {
+				decodedVal, err := url.QueryUnescape(val)
+				if err != nil {
+					logger.Warnf("error decoding url %s", val)
+					decodedVal = val
+				}
+
+				newVars[key] = decodedVal
+			}
+
+			r = mux.SetURLVars(r, newVars)
+			h.ServeHTTP(rw, r)
+		})
+	}
+}

api/routes.go

@@ -18,6 +18,14 @@ type Config struct {
 }
 
 func RegisterRoutes(router *mux.Router, config Config) {
+	// By default mux will decode url and then match the decoded url against the route
+	// we reverse the steps by telling mux to use encoded path to match the url
+	// then we manually decode via custom middleware (decodeURLMiddleware).
+	//
+	// This is to allow urn that has "/" to be matched correctly to the route
+	router.UseEncodedPath()
+	router.Use(decodeURLMiddleware(config.Logger))
+
 	typeHandler := handlers.NewTypeHandler(
 		config.Logger.WithField("reporter", "type-handler"),
 		config.TypeRepository,