utils.go

package utils

import (
	"archive/tar"
	"compress/gzip"
	"embed"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"math/rand"
	"net"
	"net/http"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"time"
)

//go:embed *.txt
var f embed.FS

// SupportsHugePages
func SupportsHugePages() (bool, error) {
	sc, err := exec.Command("sysctl", "machdep.cpu.extfeatures").Output()
	if err != nil {
		return false, err
	}
	supports := strings.Contains(string(sc), "1GBPAGE")
	return supports, nil
}

// GenerateMACAddress
func GenerateMACAddress() (string, error) {
	buf := make([]byte, 6)
	_, err := rand.Read(buf)
	if err != nil {
		return "", err
	}
	// Set the local bit
	buf[0] |= 2
	mac := fmt.Sprintf("56:%02x:%02x:%02x:%02x:%02x", buf[1], buf[2], buf[3], buf[4], buf[5])

	return mac, nil
}

// Retry retries a function
func Retry(attempts int, sleep time.Duration, f func() error) (err error) {
	for i := 0; i < attempts; i++ {
		if i > 0 {
			fmt.Printf("\r%s", strings.Repeat(".", i))
			time.Sleep(sleep)
		}
		err = f()
		if err == nil {
			return nil
		}
	}
	return fmt.Errorf("after %d attempts, last error: %s", attempts, err)
}

type Protocol int

const (
	Tcp Protocol = iota
	Udp
)

type PortMap struct {
	Host  int
	Guest int
	Proto Protocol
}

// Parses port mapping configurations
func ParsePort(ports string) ([]PortMap, error) {
	var maps []PortMap = nil
	if ports == "" {
		return maps, nil
	}
	mapcount := strings.Count(ports, ",") + 1
	if mapcount > 65535 {
		return nil, errors.New("too many port mappings specified, likely an error. Check config.yaml")
	}
	maps = make([]PortMap, mapcount)
	for i, p := range strings.Split(ports, ",") {
		newmap := PortMap{0, 0, Tcp}
		var herr, gerr error
		if strings.HasSuffix(p, "u") {
			newmap.Proto = Udp
			p = strings.TrimSuffix(p, "u")
		}
		if strings.Contains(p, ":") {
			pair := strings.Split(p, ":")
			if len(pair) != 2 {
				return nil, errors.New("incorrect port mapping pair specified. Check config.yaml")
			}
			newmap.Host, herr = strconv.Atoi(pair[0])
			newmap.Guest, gerr = strconv.Atoi(pair[1])
		} else {
			newmap.Host, herr = strconv.Atoi(p)
			newmap.Guest = newmap.Host
		}
		if herr != nil || gerr != nil {
			return nil, errors.New("error parsing specified ports. Check config.yaml")
		}
		if newmap.Host < 0 || newmap.Host > 65535 || newmap.Guest < 0 || newmap.Guest > 65535 {
			return nil, errors.New("invalid specified ports (must be 0-65535). Check config.yaml")
		}
		maps[i] = newmap
	}
	return maps, nil
}

// Ping checks if connection is reachable
func Ping(ip string, port string) error {
	address, err := net.ResolveTCPAddr("tcp", ip+":"+port)
	if err != nil {
		return err
	}

	conn, err := net.DialTCP("tcp", nil, address)
	if err != nil {
		return nil
	}

	if conn != nil {
		defer conn.Close()
		return errors.New("port " + port + " already assigned on host")
	}

	return err
}

// StringSliceContains check if string value is in []string
func StringSliceContains(s []string, e string) bool {
	for _, a := range s {
		if a == e {
			return true
		}
	}
	return false
}

// Uncompress uncompresses gzip
func Uncompress(source string, destination string) error {
	file, err := os.Open(source)
	if err != nil {
		return err
	}
	defer file.Close()

	gzRead, err := gzip.NewReader(file)
	if err != nil {
		return err
	}
	defer gzRead.Close()

	tarRead := tar.NewReader(gzRead)
	for {
		cur, err := tarRead.Next()
		if err == io.EOF {
			break
		} else if err != nil {
			return err
		}
		if strings.Contains(string(cur.Name), "..") {
			return fmt.Errorf("archive contains invalid filename: %s", cur.Name)
		}

		os.MkdirAll(destination, 0777)

		switch cur.Typeflag {

		case tar.TypeReg:
			create, err := os.Create(filepath.Join(destination, cur.Name))
			if err != nil {
				return err
			}
			defer create.Close()
			create.ReadFrom(tarRead)
		case tar.TypeLink:
			os.Link(cur.Linkname, cur.Name)
		}
	}
	return nil
}

// Compress creates a tar.gz of a Directory
func Compress(files []string, buf io.Writer) error {
	gw := gzip.NewWriter(buf)
	defer gw.Close()
	tw := tar.NewWriter(gw)
	defer tw.Close()

	for _, file := range files {
		err := addToArchive(tw, file)
		if err != nil {
			return err
		}
	}

	return nil
}

func addToArchive(tw *tar.Writer, filename string) error {

	file, err := os.Open(filename)
	if err != nil {
		return err
	}
	defer file.Close()

	info, err := file.Stat()
	if err != nil {
		return err
	}

	header, err := tar.FileInfoHeader(info, info.Name())
	if err != nil {
		return err
	}

	header.Name = filepath.Base(filename)

	err = tw.WriteHeader(header)
	if err != nil {
		return err
	}

	_, err = io.Copy(tw, file)
	if err != nil {
		return err
	}

	return nil
}

// CopyFile copies file from src to dst
func CopyFile(src, dst string) (int64, error) {
	sourceFileStat, err := os.Stat(src)
	if err != nil {
		return 0, err
	}

	if !sourceFileStat.Mode().IsRegular() {
		return 0, fmt.Errorf("%s is not a regular file", src)
	}

	source, err := os.Open(src)
	if err != nil {
		return 0, err
	}
	defer source.Close()

	destination, err := os.Create(dst)
	if err != nil {
		return 0, err
	}
	defer destination.Close()
	nBytes, err := io.Copy(destination, source)
	return nBytes, err
}

type WriteCounter struct {
	Total uint64
}

func (wc *WriteCounter) Write(p []byte) (int, error) {
	n := len(p)
	wc.Total += uint64(n)
	wc.PrintProgress()
	return n, nil
}

func (wc WriteCounter) PrintProgress() {
	fmt.Printf("\r%s", strings.Repeat(" ", 35))
	fmt.Printf("\rretrieving image... %3dMB complete", wc.Total/1000000)
}

func DownloadFile(filepath string, url string) error {
	out, err := os.Create(filepath + ".tmp")
	if err != nil {
		return err
	}

	resp, err := http.Get(url)
	if err != nil {
		out.Close()
		return err
	}

	if resp.StatusCode != 200 {
		return errors.New("requested image download is not supported: StatusCode " + strconv.Itoa(resp.StatusCode))
	}

	defer resp.Body.Close()

	counter := &WriteCounter{}
	if _, err = io.Copy(out, io.TeeReader(resp.Body, counter)); err != nil {
		out.Close()
		return err
	}

	fmt.Print("\n")
	out.Close()

	if err = os.Rename(filepath+".tmp", filepath); err != nil {
		return err
	}
	return nil
}

func GetImageURL(version string) string {
	url := "https://github.com/beringresearch/macpine/releases/download/v.01/" + version
	return url
}

func DirExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

func CommandExists(cmd string) bool {
	_, err := exec.LookPath(cmd)
	return err == nil
}

func GenerateRandomAlias() string {
	var alias string
	var adjectivesString []string
	var nounsString []string

	adjectives, _ := f.ReadFile("adjectives.txt")
	adjectivesString = strings.Split(string(adjectives), "\n")

	nouns, _ := f.ReadFile("nouns.txt")
	nounsString = strings.Split(string(nouns), "\n")

	rand.Seed(time.Now().Unix())
	n := rand.Int() % len(adjectivesString)
	a := adjectivesString[n]

	rand.Seed(time.Now().Unix())
	n = rand.Int() % len(nounsString)
	o := nounsString[n]

	alias = a + "-" + o
	return alias

}

type CmdResult struct {
	Name string
	Err  error
}

func PassphrasePromptForDecryption() (string, error) {
	pass, err := readSecret("enter passphrase:")
	if err != nil {
		return "", fmt.Errorf("could not read passphrase: %v", err)
	}
	p := string(pass)
	return p, nil
}

func PassphrasePromptForEncryption() (string, error) {
	pass, err := readSecret("enter passphrase (leave empty to autogenerate a secure one):")
	if err != nil {
		return "", fmt.Errorf("could not read passphrase: %v", err)
	}
	p := string(pass)
	if p == "" {
		var words []string
		for i := 0; i < 10; i++ {
			rword, err := randomWord()
			if err != nil {
				return "", err
			}
			words = append(words, rword)
		}
		p = strings.Join(words, "-")
		err := printfToTerminal("using autogenerated passphrase %q", p)
		if err != nil {
			return "", fmt.Errorf("could not print passphrase: %v", err)
		}
	} else {
		confirm, err := readSecret("confirm passphrase:")
		if err != nil {
			return "", fmt.Errorf("could not read passphrase: %v", err)
		}
		if string(confirm) != p {
			return "", fmt.Errorf("passphrases didn't match")
		}
	}
	return p, nil
}

func randomWord() (string, error) {
	buf := make([]byte, 2)
	if _, err := rand.Read(buf); err != nil {
		return "", err
	}
	n := binary.BigEndian.Uint16(buf)
	return wordlist[int(n)%2048], nil
}

// wordlist is the BIP39 list of 2048 english words, and it's used to generate
// the suggested passphrases.
var wordlist = strings.Split(`abandon ability able about above absent absorb abstract absurd abuse access accident account accuse achieve acid acoustic acquire across act action actor actress actual adapt add addict address adjust admit adult advance advice aerobic affair afford afraid again age agent agree ahead aim air airport aisle alarm album alcohol alert alien all alley allow almost alone alpha already also alter always amateur amazing among amount amused analyst anchor ancient anger angle angry animal ankle announce annual another answer antenna antique anxiety any apart apology appear apple approve april arch arctic area arena argue arm armed armor army around arrange arrest arrive arrow art artefact artist artwork ask aspect assault asset assist assume asthma athlete atom attack attend attitude attract auction audit august aunt author auto autumn average avocado avoid awake aware away awesome awful awkward axis baby bachelor bacon badge bag balance balcony ball bamboo banana 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