Add location service (#27471)

util/service/location.go

@@ -0,0 +1,62 @@
+package service
+
+import (
+	"encoding/json"
+	"net"
+	"net/http"
+	"sync"
+
+	"github.com/evcc-io/evcc/server/service"
+	"github.com/evcc-io/evcc/util"
+	"github.com/evcc-io/evcc/util/request"
+	"github.com/spf13/cast"
+)
+
+func init() {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /lat", update(getLatitude))
+	mux.HandleFunc("GET /lon", update(getLongitude))
+	mux.HandleFunc("GET /ip", update(getIP))
+
+	service.Register("location", mux)
+}
+
+type IpApi struct {
+	CountryCode string
+	City        string
+	Zip         string
+	Lat         float64
+	Lon         float64
+	Query       net.IP
+}
+
+var (
+	onceLocation sync.Once
+	location     IpApi
+)
+
+func update(fun func(http.ResponseWriter, *http.Request)) func(w http.ResponseWriter, req *http.Request) {
+	return func(w http.ResponseWriter, req *http.Request) {
+		onceLocation.Do(func() {
+			log := util.NewLogger("main")
+			client := request.NewHelper(log)
+			if err := client.GetJSON("http://ip-api.com/json", &location); err != nil {
+				log.ERROR.Printf("location: %v", err)
+			}
+		})
+
+		fun(w, req)
+	}
+}
+
+func getLatitude(w http.ResponseWriter, req *http.Request) {
+	json.NewEncoder(w).Encode([]string{cast.ToString(location.Lat)})
+}
+
+func getLongitude(w http.ResponseWriter, req *http.Request) {
+	json.NewEncoder(w).Encode([]string{cast.ToString(location.Lon)})
+}
+
+func getIP(w http.ResponseWriter, req *http.Request) {
+	json.NewEncoder(w).Encode([]string{location.Query.String()})
+}

util/templates/defaults.yaml

@@ -461,6 +461,7 @@ params:
       de: Breitengrad
     type: float
     example: 55.7351
+    service: location/lat
   - name: lon
     private: true
     description:
@@ -468,6 +469,7 @@ params:
       de: Längengrad
     type: float
     example: 9.1275
+    service: location/lon
 
 presets:
   vehicle-base: