Refactor environment sensor URL path generation

main.go

@@ -2,18 +2,17 @@ package main
 
 import (
 	"flag"
-	"fmt"
 	"log"
 	"net/http"
 	"os"
 	"os/signal"
-	"strings"
 	"syscall"
 
 	"git.hamburg.ccc.de/ccchh/spaceapid/config"
 	"git.hamburg.ccc.de/ccchh/spaceapid/handlers"
 	"git.hamburg.ccc.de/ccchh/spaceapid/persistence"
 	"git.hamburg.ccc.de/ccchh/spaceapid/types"
+	"git.hamburg.ccc.de/ccchh/spaceapid/util"
 )
 
 var (
@@ -59,15 +58,15 @@ func main() {
 		handlers.StateOpen(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
 	)
 	// Register handlers for Environmental Sensors
-	for key, envSensorConfigs := range conf.Dynamic.Sensors {
+	for sensorType, envSensorConfigs := range conf.Dynamic.Sensors {
 		for i, envSensorConfig := range envSensorConfigs {
-			pattern := fmt.Sprintf("/sensors/%s/%s", key, envSensorConfig.SensorData.Location)
-			if envSensorConfig.SensorData.Name != "" {
-				pattern += "/" + envSensorConfig.SensorData.Name
-			}
-			http.HandleFunc(strings.ToLower(pattern),
+			urlPath := util.GetSensorURLPath(
+				sensorType, envSensorConfig.SensorData.Location, envSensorConfig.SensorData.Name,
+			)
+			http.HandleFunc(
+				urlPath,
 				handlers.EnvironmentSensor(
-					conf.Credentials, envSensorConfig.AllowedCredentials, &conf.Response.Sensors[key][i],
+					conf.Credentials, envSensorConfig.AllowedCredentials, &conf.Response.Sensors[sensorType][i],
 				),
 			)
 		}

util/util.go

@@ -0,0 +1,20 @@
+package util
+
+import (
+	"fmt"
+	"strings"
+)
+
+// GetSensorURLPath generates the URL path for the given sensor details.
+// location and name may be optional depending on sensorType, see the schema definition for details.
+// The path is always all-lowercase.
+func GetSensorURLPath(sensorType, location, name string) string {
+	path := fmt.Sprintf("/sensors/%s", sensorType)
+	if location != "" {
+		path += "/" + location
+	}
+	if name != "" {
+		path += "/" + name
+	}
+	return strings.ToLower(path)
+}