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package main
import (
"encoding/json"
"fmt"
"io"
"os"
"sort"
"strings"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/urfave/cli/v2"
)
var topLevelCommands []*cli.Command
type dummyWriteCloser struct {
io.Writer
}
func (*dummyWriteCloser) Close() error {
return nil
}
func outputFlag() cli.Flag {
return &cli.StringFlag{
Name: "output",
Aliases: []string{"o"},
Usage: "Write output to `FILE`",
Value: "-",
}
}
func keyFlag(use string) cli.Flag {
return &cli.StringFlag{
Name: "key",
Aliases: []string{"k"},
Usage: "`FILE` containing the key to " + use + " with",
Required: true,
}
}
func keyFormatFlag() cli.Flag {
return &cli.StringFlag{
Name: "key-format",
Usage: "JWK format: json or pem",
Value: "json",
}
}
func main() {
var app cli.App
app.Commands = topLevelCommands
app.Usage = "Tools for various JWE/JWK/JWS/JWT operations"
sort.Slice(app.Commands, func(i, j int) bool {
return strings.Compare(app.Commands[i].Name, app.Commands[j].Name) < 0
})
if err := app.Run(os.Args); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
os.Exit(1)
}
}
func dumpJSON(dst io.Writer, v interface{}) error {
buf, err := json.MarshalIndent(v, "", " ")
if err != nil {
return fmt.Errorf(`failed to serialize to JSON: %w`, err)
}
dst.Write(buf)
return nil
}
func getSource(filename string) (io.ReadCloser, error) {
var src io.ReadCloser
if filename == "-" {
src = io.NopCloser(os.Stdin)
} else {
if filename == "" {
return nil, fmt.Errorf(`filename required (use "-" to read from stdin)`)
}
f, err := os.Open(filename)
if err != nil {
return nil, fmt.Errorf(`failed to open file %s: %w`, filename, err)
}
src = f
}
return src, nil
}
func getOutput(filename string) (io.WriteCloser, error) {
var output io.WriteCloser
switch filename {
case "-":
output = &dummyWriteCloser{os.Stdout}
case "":
return nil, fmt.Errorf(`output must be a file name, or "-" for STDOUT`)
default:
f, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return nil, fmt.Errorf(`failed to create file %s: %w`, filename, err)
}
output = f
}
return output, nil
}
func getKeyFile(keyfile, format string) (jwk.Set, error) {
var keyoptions []jwk.ReadFileOption
switch format {
case "json":
case "pem":
keyoptions = append(keyoptions, jwk.WithPEM(true))
default:
return nil, fmt.Errorf(`invalid JWK format "%s"`, format)
}
keyset, err := jwk.ReadFile(keyfile, keyoptions...)
if err != nil {
return nil, fmt.Errorf(`failed to parse key: %w`, err)
}
return keyset, nil
}
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