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recv.go
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recv.go
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package cmd
import (
"bufio"
"context"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"github.com/cheggaaa/pb/v3"
"github.com/klauspost/compress/zip"
"github.com/psanford/wormhole-william/wormhole"
"github.com/spf13/cobra"
)
func recvCommand() *cobra.Command {
cmd := cobra.Command{
Use: "receive [OPTIONS] [CODE]...",
Aliases: []string{"recv"},
Short: "Receive a text message, file, or directory...",
Run: recvAction,
}
cmd.Flags().BoolVarP(&verify, "verify", "v", false, "display verification string (and wait for approval)")
cmd.Flags().BoolVar(&hideProgressBar, "hide-progress", false, "suppress progress-bar display")
cmd.ValidArgsFunction = recvCodeCompletion
return &cmd
}
func recvAction(cmd *cobra.Command, args []string) {
var (
code string
c = newClient()
ctx = context.Background()
)
if len(args) > 0 {
code = args[0]
}
if code == "" {
reader := bufio.NewReader(os.Stdin)
fmt.Print("Enter receive wormhole code: ")
line, err := reader.ReadString('\n')
if err != nil {
errf("Error reading from stdin: %s\n", err)
}
code = strings.TrimSpace(line)
}
if verify {
c.VerifierOk = func(code string) bool {
fmt.Printf("Verifier %s.\n", code)
return true
}
}
msg, err := c.Receive(ctx, code)
if err != nil {
log.Fatal(err)
}
switch msg.Type {
case wormhole.TransferText:
_, err := io.Copy(os.Stdout, msg)
if err != nil {
log.Fatal(err)
}
_, err = os.Stdout.WriteString("\n")
if err != nil {
log.Fatal(err)
}
case wormhole.TransferFile:
var acceptFile bool
if _, err := os.Stat(msg.Name); err == nil {
msg.Reject()
errf("Error refusing to overwrite existing '%s'", msg.Name)
} else if !os.IsNotExist(err) {
msg.Reject()
errf("Error stat'ing existing '%s'\n", msg.Name)
} else {
reader := bufio.NewReader(os.Stdin)
fmt.Printf("Receiving file (%s) into: %s\n", formatBytes(msg.TransferBytes64), msg.Name)
fmt.Print("ok? (y/N):")
line, err := reader.ReadString('\n')
if err != nil {
errf("Error reading from stdin: %s\n", err)
}
line = strings.TrimSpace(line)
if line == "y" {
acceptFile = true
}
if !acceptFile {
msg.Reject()
bail("transfer rejected")
} else {
wd, err := os.Getwd()
if err != nil {
bail("Failed to get working directory: %s", err)
}
f, err := ioutil.TempFile(wd, fmt.Sprintf("%s.tmp", msg.Name))
if err != nil {
bail("Failed to create tempfile: %s", err)
}
proxyReader := pbProxyReader(msg, msg.TransferBytes64)
_, err = io.Copy(f, proxyReader)
if err != nil {
os.Remove(f.Name())
bail("Receive file error: %s", err)
}
proxyReader.Close()
tmpName := f.Name()
f.Close()
err = os.Rename(tmpName, msg.Name)
if err != nil {
bail("Rename %s to %s failed: %s", tmpName, msg.Name, err)
}
}
}
case wormhole.TransferDirectory:
var acceptDir bool
wd, err := os.Getwd()
if err != nil {
bail("Failed to get working directory: %s", err)
}
dirName := msg.Name
dirName, err = filepath.Abs(dirName)
if err != nil {
bail("Failed to get abs directory: %s", err)
}
if filepath.Dir(dirName) != wd {
bail("Bad Directory name %s", msg.Name)
}
if _, err := os.Stat(dirName); err == nil {
errf("Error refusing to overwrite existing '%s'", msg.Name)
} else if !os.IsNotExist(err) {
errf("Error stat'ing existing '%s'\n", msg.Name)
} else {
reader := bufio.NewReader(os.Stdin)
fmt.Printf("Receiving directory (%s) into: %s\n", formatBytes(msg.TransferBytes64), msg.Name)
fmt.Printf("%d files, %s (uncompressed)\n", msg.FileCount, formatBytes(msg.UncompressedBytes64))
fmt.Print("ok? (y/N):")
line, err := reader.ReadString('\n')
if err != nil {
errf("Error reading from stdin: %s\n", err)
}
line = strings.TrimSpace(line)
if line == "y" {
acceptDir = true
}
if !acceptDir {
msg.Reject()
bail("transfer rejected")
} else {
err = os.Mkdir(msg.Name, 0777)
if err != nil {
bail("Mkdir error for %s: %s\n", msg.Name, err)
}
tmpFile, err := ioutil.TempFile(wd, msg.Name+".zip.tmp")
if err != nil {
bail("Failed to create tempfile: %s", err)
}
defer tmpFile.Close()
defer os.Remove(tmpFile.Name())
proxyReader := pbProxyReader(msg, msg.TransferBytes64)
n, err := io.Copy(tmpFile, proxyReader)
if err != nil {
os.Remove(tmpFile.Name())
bail("Receive file error: %s", err)
}
zr, err := zip.NewReader(tmpFile, n)
if err != nil {
bail("Read zip error: %s", err)
}
for _, zf := range zr.File {
p, err := filepath.Abs(filepath.Join(dirName, zf.Name))
if err != nil {
bail("Failes to calculate file path ABS: %s", err)
}
if !strings.HasPrefix(p, dirName) {
bail("Dangerous filename detected: %s", zf.Name)
}
rc, err := zf.Open()
if err != nil {
bail("Failed to open file in zip: %s %s", zf.Name, err)
}
dir := filepath.Dir(p)
err = os.MkdirAll(dir, 0777)
if err != nil {
bail("Failed to mkdirall %s: %s", dir, err)
}
f, err := os.OpenFile(p, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, zf.Mode())
if err != nil {
bail("Failed to open %s: %s", p, err)
}
_, err = io.Copy(f, rc)
if err != nil {
bail("Failed to write to %s: %s", p, err)
}
err = f.Close()
if err != nil {
bail("Error closing %s: %s", p, err)
}
rc.Close()
}
proxyReader.Close()
}
}
}
}
func errf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg, args...)
if !strings.HasSuffix("\n", msg) {
fmt.Fprint(os.Stderr, "\n")
}
}
func bail(msg string, args ...interface{}) {
errf(msg, args...)
os.Exit(1)
}
func formatBytes(b int64) string {
const unit = 1000
if b < unit {
return fmt.Sprintf("%d B", b)
}
div, exp := int64(unit), 0
for n := b / unit; n >= unit; n /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.1f %cB", float64(b)/float64(div), "kMGTPE"[exp])
}
type proxyReadCloser struct {
*pb.Reader
bar *pb.ProgressBar
}
func (p *proxyReadCloser) Close() error {
p.bar.Finish()
return nil
}
func pbProxyReader(r io.Reader, size int64) io.ReadCloser {
if hideProgressBar {
return ioutil.NopCloser(r)
} else {
progressBar := pb.Full.Start64(size)
progressBar.Set(pb.Bytes, true)
progressBar.Set(pb.SIBytesPrefix, true)
proxyReader := progressBar.NewProxyReader(r)
return &proxyReadCloser{
Reader: proxyReader,
bar: progressBar,
}
}
}