Use dictionaries for requesting locality weather

This is the first time in my life I've found a practical use for
dictionaries myself

cmd/clientFunc.go

@@ -58,9 +58,9 @@ type root struct {
 // 	fmt.Printf("Temperatura mínima: %v°C\n", aemetRequest.Base.Prediccion.Dia[0].Temperatura.Minima)
 // }
 
-func getJSON() (s string, err error) {
+func getJSON(codPostal string) (s string, err error) {
 	client := &http.Client{}
-	req, err := http.NewRequest("GET", "https://www.aemet.es/xml/municipios/localidad_46250.xml", nil)
+	req, err := http.NewRequest("GET", "https://www.aemet.es/xml/municipios/localidad_"+codPostal+".xml", nil)
 	if err != nil {
 		e := fmt.Errorf("Error occurred pulling data: %v\n", err)
 		return "", e

cmd/serverFunc.go

@@ -9,17 +9,32 @@ import (
 
 var (
 	listenPort  string = "1302"
+	localidades        = map[string]string{
+		"valencia": "46250",
+		"madrid":   "28079",
+	}
 )
 
 func server() {
 	router := gin.Default()
-	router.GET("/api/valencia", returnWeather)
+	router.GET("/api/:codigopostal", returnWeather)
 	fmt.Printf("Listening on port %v...\n", listenPort)
 	router.Run(":" + listenPort)
 }
 
 func returnWeather(c *gin.Context) {
-	jsonData, err := getJSON()
+	codPostal := c.Param("codigopostal")
+	isAvailable := false
+	for k := range localidades {
+		if codPostal == k {
+			isAvailable = true
+		}
+	}
+	if isAvailable == false {
+		c.String(http.StatusNotFound, "The locality doesn't exist or is currently not supported\n")
+		return
+	}
+	jsonData, err := getJSON(localidades[codPostal])
 	if err != nil {
 		e := fmt.Sprint(err)
 		c.String(http.StatusInternalServerError, e)
@@ -34,4 +49,5 @@ func returnWeather(c *gin.Context) {
 	}
 
 	c.IndentedJSON(http.StatusOK, aemetRequest)
+	//c.String(http.StatusOK, jsonData)
 }