Go: RESTful - manipulando uma array

Afluentes: Sistemas Distribuídos e Mobile

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"slices"
	"strconv"
)

func main() {
	vet := make([]string, 0)

	router := http.NewServeMux()

	router.HandleFunc("GET /strings", func(w http.ResponseWriter, r *http.Request) {
		j, err := json.Marshal(vet)
		if err != nil {
			fmt.Printf("Error: %s", err.Error())
		} else {
			fmt.Fprintf(w, "%s", string(j))
		}
	})

	router.HandleFunc("GET /strings/{index}", func(w http.ResponseWriter, r *http.Request) {
		index, err := strconv.Atoi(r.PathValue("index"))
		if err != nil || index >= len(vet) {
			fmt.Fprintf(w, "max position is %d", len(vet)-1)
			return
		}
		out := vet[index]
		fmt.Fprintf(w, "%s", out)
	})

	router.HandleFunc("POST /strings", func(w http.ResponseWriter, r *http.Request) {
		strvet := make([]string, 0)
		err := json.NewDecoder(r.Body).Decode(&strvet)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		vet = slices.Concat(vet, strvet)
	})

	router.HandleFunc("DELETE /strings/{index}", func(w http.ResponseWriter, r *http.Request) {
		index, err := strconv.Atoi(r.PathValue("index"))
		if err != nil || index >= len(vet) {
			fmt.Fprintf(w, "wrong position %d", len(vet)-1)
			return
		}
		vet = append(vet[:index], vet[index+1:]...)
	})

	if err := http.ListenAndServe("localhost:8080", router); err != nil {
		fmt.Println(err.Error())
	}
}