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tokens.go
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tokens.go
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package utilities
import (
"crypto/rand"
"encoding/base64"
"fmt"
"io"
"strconv"
"time"
"github.com/dgrijalva/jwt-go"
)
// AuthCodeClaims represents the claims of an auth code
type AuthCodeClaims struct {
ClientID string `json:"cid"`
UserID int64 `json:"uid"`
RedirectURI string `json:"ruri"`
Scopes string `json:"scp"`
ExpiresAt int64 `json:"exp"`
HeaderMap map[string]string `json:"hmap"`
jwt.StandardClaims
}
// GenerateRandomString generates random bytes and encodes them to a hex string
func GenerateRandomString(count int) (string, error) {
buf := make([]byte, count)
_, err := io.ReadFull(rand.Reader, buf)
if err != nil {
return "", fmt.Errorf("could not generate random bytes: %s", err)
}
return base64.URLEncoding.EncodeToString(buf), nil
}
// GenerateAuthCode generates a JWT self-encoded auth code
//
// Args:
// secret: secret key
// claims: auth code claims
func GenerateAuthCode(secret string, claims *AuthCodeClaims) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString([]byte(secret))
if err != nil {
return "", fmt.Errorf("could not generate auth code: %s", err)
}
return tokenString, nil
}
// DecodeAuthCode decodes a JWT self-encoded auth code
//
// Args:
// secret: secret key
// code: auth code
func DecodeAuthCode(secret, code string) (*AuthCodeClaims, error) {
token, err := jwt.ParseWithClaims(code, &AuthCodeClaims{}, func(token *jwt.Token) (interface{}, error) {
return []byte(secret), nil
})
if err != nil {
return nil, fmt.Errorf("could not decode auth code: %s", err)
}
claims, ok := token.Claims.(*AuthCodeClaims)
if !ok {
return nil, fmt.Errorf("could not decode auth code: %s", err)
}
if claims.ExpiresAt < jwt.TimeFunc().Unix() {
return nil, fmt.Errorf("could not decode auth code: token expired")
}
return claims, nil
}
// GenerateUserToken generates a JWT token for a user
func GenerateUserToken(secret string, userID int64) (string, error) {
claims := &jwt.StandardClaims{
Subject: fmt.Sprintf("%d", userID),
ExpiresAt: jwt.TimeFunc().Add(time.Hour * 24 * 7).Unix(), // expires in 7 days
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString([]byte(secret))
if err != nil {
return "", fmt.Errorf("could not generate user token: %s", err)
}
return tokenString, nil
}
func GenerateStandardToken(secretKey string) (string, error) {
token := jwt.New(jwt.SigningMethodHS256)
claims := &jwt.StandardClaims{
ExpiresAt: time.Now().Add(time.Hour * 24 * 7).Unix(),
}
token.Claims = claims
tokenString, err := token.SignedString([]byte(secretKey))
if err != nil {
return "", fmt.Errorf("could not generate standard token: %s", err)
}
return tokenString, nil
}
// VerifyUserToken verifies a JWT token for a user and returns the user ID
func VerifyUserToken(secret, token string) (int64, error) {
claims := &jwt.StandardClaims{}
_, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
return []byte(secret), nil
})
if err != nil {
return 0, fmt.Errorf("could not verify user token: %s", err)
}
if claims.ExpiresAt < jwt.TimeFunc().Unix() {
return 0, fmt.Errorf("could not verify user token: token expired")
}
id, err := strconv.ParseInt(claims.Subject, 10, 64)
if err != nil {
return 0, fmt.Errorf("could not verify user token: %s", err)
}
return id, nil
}
func VerifyStandardToken(tokenString string, secretKey string) (*jwt.StandardClaims, error) {
token, err := jwt.ParseWithClaims(tokenString, &jwt.StandardClaims{}, func(token *jwt.Token) (interface{}, error) {
return []byte(secretKey), nil
})
if err != nil {
return nil, err
}
if claims, ok := token.Claims.(*jwt.StandardClaims); ok && token.Valid {
return claims, nil
}
return nil, fmt.Errorf("invalid token")
}