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package main
import (
"flag"
"fmt"
"io"
"os"
mh "github.com/multiformats/go-multihash"
mhopts "github.com/multiformats/go-multihash/opts"
_ "github.com/multiformats/go-multihash/register/all"
_ "github.com/multiformats/go-multihash/register/miniosha256"
)
var usage = `usage: %s [options] [FILE]
Print or check multihash checksums.
With no FILE, or when FILE is -, read standard input.
Options:
`
// flags
var opts *mhopts.Options
var checkRaw string
var checkMh mh.Multihash
var quiet bool
var help bool
func init() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, usage, os.Args[0])
flag.PrintDefaults()
}
opts = mhopts.SetupFlags(flag.CommandLine)
checkStr := "check checksum matches"
flag.StringVar(&checkRaw, "check", "", checkStr)
flag.StringVar(&checkRaw, "c", "", checkStr+" (shorthand)")
helpStr := "display help message"
flag.BoolVar(&help, "help", false, helpStr)
flag.BoolVar(&help, "h", false, helpStr+" (shorthand)")
quietStr := "quiet output (no newline on checksum, no error text)"
flag.BoolVar(&quiet, "quiet", false, quietStr)
flag.BoolVar(&quiet, "q", false, quietStr+" (shorthand)")
}
func parseFlags(o *mhopts.Options) error {
flag.Parse()
if err := o.ParseError(); err != nil {
return err
}
if checkRaw != "" {
var err error
checkMh, err = mhopts.Decode(o.Encoding, checkRaw)
if err != nil {
return fmt.Errorf("fail to decode check '%s': %s", checkRaw, err)
}
}
return nil
}
func getInput() (io.ReadCloser, error) {
args := flag.Args()
switch {
case len(args) < 1:
return os.Stdin, nil
case args[0] == "-":
return os.Stdin, nil
default:
f, err := os.Open(args[0])
if err != nil {
return nil, fmt.Errorf("failed to open '%s': %s", args[0], err)
}
return f, nil
}
}
func printHash(o *mhopts.Options, r io.Reader) error {
h, err := o.Multihash(r)
if err != nil {
return err
}
s, err := mhopts.Encode(o.Encoding, h)
if err != nil {
return err
}
if quiet {
fmt.Print(s)
} else {
fmt.Println(s)
}
return nil
}
func main() {
checkErr := func(err error) {
if err != nil {
die("error: ", err)
}
}
err := parseFlags(opts)
checkErr(err)
if help {
flag.Usage()
os.Exit(0)
}
inp, err := getInput()
checkErr(err)
if checkMh != nil {
err = opts.Check(inp, checkMh)
checkErr(err)
if !quiet {
fmt.Println("OK checksums match (-q for no output)")
}
} else {
err = printHash(opts, inp)
checkErr(err)
}
inp.Close()
}
func die(v ...interface{}) {
if !quiet {
fmt.Fprint(os.Stderr, v...)
fmt.Fprint(os.Stderr, "\n")
}
// flag.Usage()
os.Exit(1)
}
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