Config UI: dynamic default values, remove static HA instance default (#25525)

util/demo/service.go

@@ -0,0 +1,39 @@
+package demo
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/evcc-io/evcc/server/service"
+)
+
+func init() {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /single", getSingle)
+	mux.HandleFunc("GET /country", getCountry)
+	mux.HandleFunc("GET /{country}/city", getCity)
+
+	service.Register("demo", mux)
+}
+
+func getSingle(w http.ResponseWriter, req *http.Request) {
+	json.NewEncoder(w).Encode([]string{"demo-value"})
+}
+
+func getCountry(w http.ResponseWriter, req *http.Request) {
+	json.NewEncoder(w).Encode([]string{"germany", "france", "spain"})
+}
+
+func getCity(w http.ResponseWriter, req *http.Request) {
+	country := req.PathValue("country")
+	var cities []string
+	switch country {
+	case "germany":
+		cities = []string{"berlin", "munich", "hamburg"}
+	case "france":
+		cities = []string{"paris", "lyon", "marseille"}
+	case "spain":
+		cities = []string{"madrid", "barcelona", "valencia"}
+	}
+	json.NewEncoder(w).Encode(cities)
+}