URLからsoundcloudのリソースのタイプとIDとストリーミング再生できるかをとってくるやつ

resolve_soundcloud.go

package main

// CLIENT_ID=<your client id> go run resolve_soundcloud.go <soundcloud url>

import (
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"net/http"
	"os"
)

const (
	ApiEndPoint = "http://api.soundcloud.com"
)

var (
	ClientId = os.Getenv("CLIENT_ID")
	url      = os.Args[1]
)

func main() {
	fmt.Printf("Resolving %s\n", url)
	item, err := ResolveSoundCloudURL(url)

	if err != nil {
		log.Println(err.Error())
		return
	}

	fmt.Printf("ID: %d\n", item.Id)
	fmt.Printf("Kind: %s\n", item.Kind)
	fmt.Printf("Streamable: %t\n", item.Streamable)
}

type Item struct {
	Id         int
	Kind       string
	Streamable bool
}

func ResolveSoundCloudURL(url string) (*Item, error) {
	item := new(Item)

	resp, apiErr := http.Get(ApiEndPoint + "/resolve.json?url=" + url + "&client_id=" + ClientId)
	if apiErr != nil {
		return item, apiErr
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return item, errors.New(resp.Status)
	}

	decodeErr := json.NewDecoder(resp.Body).Decode(item)
	if decodeErr != nil {
		return item, decodeErr
	}

	return item, nil
}