Convert to Cashaddr

main.go

// Put addresses in addrs.txt file in the directory you run this program from
// It will convert them to cashaddr and write them to stdout

package main

import (
	"bufio"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
)

type cashaddrResp struct {
	Cashaddr string `json:"cashaddr"`
}

func main() {
	addrs, err := readAddrs("./addrs.txt")
	if err != nil {
		log.Fatal("Read addrs failed for: ./addrs.txt")
	}

	for _, addr := range addrs {
		r, err := http.Get("https://cashaddr.bitcoincash.org/convert?address=" + addr)
		if err != nil {
			log.Fatal("Get failed for:", addr)
		}

		resp, err := ioutil.ReadAll(r.Body)
		if err != nil {
			log.Fatal("Read response failed for:", addr)
		}

		cr := &cashaddrResp{}
		err = json.Unmarshal(resp, cr)
		if err != nil {
			log.Fatal("Unmarshal response failed for:", addr)
		}

		fmt.Println(cr.Cashaddr)
	}
}

func readAddrs(path string) ([]string, error) {
	file, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	var lines []string
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}
	return lines, scanner.Err()
}