/usr/share/gocode/src/github.com/dgrijalva/jwt-go/cmd/jwt/app.go is in golang-github-dgrijalva-jwt-go-dev 3.0.0.1+REALLY.2.6.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | // A useful example app. You can use this to debug your tokens on the command line.
// This is also a great place to look at how you might use this library.
//
// Example usage:
// The following will create and sign a token, then verify it and output the original claims.
// echo {\"foo\":\"bar\"} | bin/jwt -key test/sample_key -alg RS256 -sign - | bin/jwt -key test/sample_key.pub -verify -
package main
import (
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"regexp"
"strings"
"github.com/dgrijalva/jwt-go"
)
var (
// Options
flagAlg = flag.String("alg", "", "signing algorithm identifier")
flagKey = flag.String("key", "", "path to key file or '-' to read from stdin")
flagCompact = flag.Bool("compact", false, "output compact JSON")
flagDebug = flag.Bool("debug", false, "print out all kinds of debug data")
// Modes - exactly one of these is required
flagSign = flag.String("sign", "", "path to claims object to sign or '-' to read from stdin")
flagVerify = flag.String("verify", "", "path to JWT token to verify or '-' to read from stdin")
)
func main() {
// Usage message if you ask for -help or if you mess up inputs.
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
fmt.Fprintf(os.Stderr, " One of the following flags is required: sign, verify\n")
flag.PrintDefaults()
}
// Parse command line options
flag.Parse()
// Do the thing. If something goes wrong, print error to stderr
// and exit with a non-zero status code
if err := start(); err != nil {
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
os.Exit(1)
}
}
// Figure out which thing to do and then do that
func start() error {
if *flagSign != "" {
return signToken()
} else if *flagVerify != "" {
return verifyToken()
} else {
flag.Usage()
return fmt.Errorf("None of the required flags are present. What do you want me to do?")
}
}
// Helper func: Read input from specified file or stdin
func loadData(p string) ([]byte, error) {
if p == "" {
return nil, fmt.Errorf("No path specified")
}
var rdr io.Reader
if p == "-" {
rdr = os.Stdin
} else {
if f, err := os.Open(p); err == nil {
rdr = f
defer f.Close()
} else {
return nil, err
}
}
return ioutil.ReadAll(rdr)
}
// Print a json object in accordance with the prophecy (or the command line options)
func printJSON(j interface{}) error {
var out []byte
var err error
if *flagCompact == false {
out, err = json.MarshalIndent(j, "", " ")
} else {
out, err = json.Marshal(j)
}
if err == nil {
fmt.Println(string(out))
}
return err
}
// Verify a token and output the claims. This is a great example
// of how to verify and view a token.
func verifyToken() error {
// get the token
tokData, err := loadData(*flagVerify)
if err != nil {
return fmt.Errorf("Couldn't read token: %v", err)
}
// trim possible whitespace from token
tokData = regexp.MustCompile(`\s*$`).ReplaceAll(tokData, []byte{})
if *flagDebug {
fmt.Fprintf(os.Stderr, "Token len: %v bytes\n", len(tokData))
}
// Parse the token. Load the key from command line option
token, err := jwt.Parse(string(tokData), func(t *jwt.Token) (interface{}, error) {
data, err := loadData(*flagKey)
if err != nil {
return nil, err
}
if isEs() {
return jwt.ParseECPublicKeyFromPEM(data)
}
return data, nil
})
// Print some debug data
if *flagDebug && token != nil {
fmt.Fprintf(os.Stderr, "Header:\n%v\n", token.Header)
fmt.Fprintf(os.Stderr, "Claims:\n%v\n", token.Claims)
}
// Print an error if we can't parse for some reason
if err != nil {
return fmt.Errorf("Couldn't parse token: %v", err)
}
// Is token invalid?
if !token.Valid {
return fmt.Errorf("Token is invalid")
}
// Print the token details
if err := printJSON(token.Claims); err != nil {
return fmt.Errorf("Failed to output claims: %v", err)
}
return nil
}
// Create, sign, and output a token. This is a great, simple example of
// how to use this library to create and sign a token.
func signToken() error {
// get the token data from command line arguments
tokData, err := loadData(*flagSign)
if err != nil {
return fmt.Errorf("Couldn't read token: %v", err)
} else if *flagDebug {
fmt.Fprintf(os.Stderr, "Token: %v bytes", len(tokData))
}
// parse the JSON of the claims
var claims map[string]interface{}
if err := json.Unmarshal(tokData, &claims); err != nil {
return fmt.Errorf("Couldn't parse claims JSON: %v", err)
}
// get the key
var key interface{}
key, err = loadData(*flagKey)
if err != nil {
return fmt.Errorf("Couldn't read key: %v", err)
}
// get the signing alg
alg := jwt.GetSigningMethod(*flagAlg)
if alg == nil {
return fmt.Errorf("Couldn't find signing method: %v", *flagAlg)
}
// create a new token
token := jwt.New(alg)
token.Claims = claims
if isEs() {
if k, ok := key.([]byte); !ok {
return fmt.Errorf("Couldn't convert key data to key")
} else {
key, err = jwt.ParseECPrivateKeyFromPEM(k)
if err != nil {
return err
}
}
}
if out, err := token.SignedString(key); err == nil {
fmt.Println(out)
} else {
return fmt.Errorf("Error signing token: %v", err)
}
return nil
}
func isEs() bool {
return strings.HasPrefix(*flagAlg, "ES")
}
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