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main.go
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main.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"log"
"os"
"github.com/laststem/jwt-parser/internal"
)
const (
printUsage = 1
printAll = 2
)
const usage = `Usage:
jwt-parser <token>
Ex)
jwt-parser eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
{
"sub": "",
"name": "",
"iat": 0
}
jwt-parser <token> <key> <key> <key> ...
Ex)
jwt-parser eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c sub
1234567890"`
func main() {
switch len(os.Args) {
case printUsage:
fmt.Println(usage)
case printAll:
token := parse(os.Args[1])
data := marshal(token.Payload)
print(data)
default:
token := parse(os.Args[1])
payload := goDeep(token.Payload, os.Args[2:])
data := marshal(payload)
print(data)
}
}
func parse(raw string) *internal.Token {
token, err := internal.Parse(raw)
if err != nil {
log.Fatal(err)
}
return token
}
func goDeep(payload map[string]interface{}, key []string) interface{} {
if len(key) == 1 {
return payload[key[0]]
}
remain, ok := payload[key[0]]
if !ok {
log.Fatalf("not found key: %v", key)
}
if p, ok := remain.(map[string]interface{}); ok {
return goDeep(p, key[1:])
}
log.Fatalf("not found key: %v", key)
return nil
}
func marshal(payload interface{}) []byte {
data, err := json.Marshal(payload)
if err != nil {
log.Fatal(err)
}
return data
}
func print(data []byte) {
data, err := makePretty(data)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(data))
}
func makePretty(data []byte) ([]byte, error) {
var out bytes.Buffer
if err := json.Indent(&out, data, "", " "); err != nil {
return nil, err
}
return out.Bytes(), nil
}