Go script to ping the USPS package tracking API

usps.go

package main

import (
	"encoding/xml"
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
)

var (
	user = flag.String("user", "", "USPS API User ID")
	id   = flag.String("package_id", "", "USPS Package ID")
)

type response struct {
	Summary string   `xml:"TrackInfo>TrackSummary"`
	Detail  []string `xml:"TrackInfo>TrackDetail"`
}

func main() {
	flag.Parse()

	url := "http://production.shippingapis.com/ShippingAPI.dll?API=TrackV2&XML=" +
		url.QueryEscape(fmt.Sprintf(`<TrackRequest USERID="%s"><TrackID ID="%s"></TrackID></TrackRequest>`, *user, *id))
	resp, err := http.Get(url)
	if err != nil {
		log.Fatalf("get: %v", err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		all, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			log.Fatalf("error reading response: %v", err)
		}
		log.Fatalf("HTTP error %d\n%s", resp.StatusCode, string(all))
	}
	var r response
	if err := xml.NewDecoder(resp.Body).Decode(&r); err != nil {
		log.Fatalf("error decoding xml: %v", err)
	}
	log.Println("Summary", r.Summary)
	log.Println("Details:")
	for _, d := range r.Detail {
		log.Println("-", d)
	}
}

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