newsbot-api/internal/handler/v1/jwt.go

100 lines
2.2 KiB
Go

package v1
import (
"errors"
"strings"
"time"
"git.jamestombleson.com/jtom38/newsbot-api/internal/domain"
"github.com/golang-jwt/jwt/v5"
)
const (
ErrJwtMissing = "auth token is missing"
ErrJwtClaimsMissing = "claims missing on token"
ErrJwtExpired = "auth token has expired"
ErrJwtScopeMissing = "required scope is missing"
)
type JwtToken struct {
Exp time.Time `json:"exp"`
Iss string `json:"iss"`
Authorized bool `json:"authorized"`
UserName string `json:"username"`
Scopes []string `json:"scopes"`
jwt.RegisteredClaims
}
func (j JwtToken) IsValid(scope string) error {
err := j.hasExpired()
if err != nil {
return err
}
err = j.hasScope(scope)
if err != nil {
return err
}
return nil
}
func (j JwtToken) GetUsername() string {
return j.UserName
}
func (j JwtToken) hasExpired() error {
// Check to see if the token has expired
hasExpired := j.Exp.Compare(time.Now())
if hasExpired == -1 {
return errors.New(ErrJwtExpired)
}
return nil
}
func (j JwtToken) hasScope(scope string) error {
// they have the scope to access everything, so let them pass.
if strings.Contains(domain.ScopeAll, scope) {
return nil
}
for _, s := range j.Scopes {
if strings.Contains(s, scope) {
return nil
}
}
return errors.New(ErrJwtScopeMissing)
}
func (h *Handler) generateJwt(username, issuer string) (string, error) {
return h.generateJwtWithExp(username, issuer, time.Now().Add(10*time.Minute))
}
func (h *Handler) generateJwtWithExp(username, issuer string, expiresAt time.Time) (string, error) {
secret := []byte(h.config.JwtSecret)
// Anyone who wants to decrypt the key needs to use the same method
token := jwt.New(jwt.SigningMethodHS256)
claims := token.Claims.(jwt.MapClaims)
claims["exp"] = expiresAt
claims["authorized"] = true
claims["username"] = username
claims["iss"] = issuer
var scopes []string
if username == "admin" {
scopes = append(scopes, domain.ScopeAll)
claims["scopes"] = scopes
} else {
scopes = append(scopes, domain.ScopeRead)
claims["scopes"] = scopes
}
tokenString, err := token.SignedString(secret)
if err != nil {
return "", err
}
return tokenString, nil
}