64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"strconv"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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var secretKey = []byte("replace-with-env-variable")
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type UserClaims struct {
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Name string `json:"name"`
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Color string `json:"color"`
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jwt.RegisteredClaims
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}
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func GetToken(user *User) (string, error) {
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token := jwt.NewWithClaims(jwt.SigningMethodHS256,
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UserClaims{
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Name: user.Name,
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Color: string(user.Color[:]),
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RegisteredClaims: jwt.RegisteredClaims{
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Subject: strconv.Itoa(int(user.Id)),
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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},
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},
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)
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return token.SignedString(secretKey)
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}
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func GetUserFromToken(tokenString string) (User, error) {
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token, err := jwt.ParseWithClaims(tokenString, &UserClaims{}, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
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}
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return secretKey, nil
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})
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if err != nil {
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return User{}, err
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}
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claims, ok := token.Claims.(*UserClaims)
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if !ok || !token.Valid {
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return User{}, errors.New("invalid token")
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}
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id, err := strconv.ParseUint(claims.Subject, 10, 64)
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if err != nil {
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return User{}, fmt.Errorf("invalid subject: %w", err)
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}
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var color [3]byte
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copy(color[:], claims.Color)
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return User{
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Id: id,
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Name: claims.Name,
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Color: color,
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}, nil
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}
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