120 lines
3.7 KiB
Go
120 lines
3.7 KiB
Go
package security
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import (
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"errors"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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const TokenAudience = "KRA"
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var (
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ErrEmptySigningKey = errors.New("empty JWT signing key")
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ErrInvalidClaims = errors.New("invalid token claims")
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ErrTokenExpired = errors.New("token expired")
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ErrTokenMalformed = errors.New("token malformed")
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ErrTokenSignatureInvalid = errors.New("token signature invalid")
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ErrTokenNotValidYet = errors.New("token not valid yet")
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ErrTokenInvalid = errors.New("token invalid")
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)
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type Claims struct {
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UUID string
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ID uint
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Username string
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NickName string
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AuthorityID uint `json:"AuthorityId"`
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BufferTime int64
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UserType string
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MustChangePwd bool `json:"mustChangePwd"`
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PasswordVersion int64 `json:"passwordVersion,omitempty"`
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jwt.RegisteredClaims
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}
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func Generate(secret, issuer string, expires, buffer time.Duration, userID, authorityID uint, uuid, username, nickname string, mustChange bool, passwordVersion int64) (string, *Claims, error) {
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if err := validateSigningOptions(secret, expires, buffer); err != nil {
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return "", nil, err
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}
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now := time.Now()
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claims := &Claims{UUID: uuid, ID: userID, Username: username, NickName: nickname, AuthorityID: authorityID, BufferTime: int64(buffer / time.Second), UserType: "admin", MustChangePwd: mustChange, PasswordVersion: passwordVersion, RegisteredClaims: jwt.RegisteredClaims{Audience: jwt.ClaimStrings{TokenAudience}, Issuer: issuer, IssuedAt: jwt.NewNumericDate(now), NotBefore: jwt.NewNumericDate(now.Add(-time.Second)), ExpiresAt: jwt.NewNumericDate(now.Add(expires))}}
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token, err := Sign(secret, claims)
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return token, claims, err
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}
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func Sign(secret string, claims *Claims) (string, error) {
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if secret == "" {
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return "", ErrEmptySigningKey
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}
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if claims == nil {
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return "", ErrInvalidClaims
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}
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return jwt.NewWithClaims(jwt.SigningMethodHS256, claims).SignedString([]byte(secret))
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}
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func Parse(tokenString, secret string) (*Claims, error) {
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return parse(tokenString, secret, "")
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}
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// ParseWithIssuer validates a KRA admin token and its configured issuer.
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func ParseWithIssuer(tokenString, secret, issuer string) (*Claims, error) {
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return parse(tokenString, secret, issuer)
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}
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func parse(tokenString, secret, issuer string) (*Claims, error) {
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if secret == "" {
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return nil, ErrEmptySigningKey
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}
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options := []jwt.ParserOption{
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jwt.WithValidMethods([]string{jwt.SigningMethodHS256.Alg()}),
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jwt.WithAudience(TokenAudience),
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jwt.WithExpirationRequired(),
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jwt.WithNotBeforeRequired(),
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jwt.WithLeeway(time.Second),
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}
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if issuer != "" {
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options = append(options, jwt.WithIssuer(issuer))
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}
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token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (any, error) {
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if token.Method != jwt.SigningMethodHS256 {
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return nil, errors.New("unexpected signing method")
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}
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return []byte(secret), nil
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}, options...)
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if err != nil {
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switch {
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case errors.Is(err, jwt.ErrTokenExpired):
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return nil, ErrTokenExpired
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case errors.Is(err, jwt.ErrTokenMalformed):
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return nil, ErrTokenMalformed
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case errors.Is(err, jwt.ErrTokenSignatureInvalid):
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return nil, ErrTokenSignatureInvalid
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case errors.Is(err, jwt.ErrTokenNotValidYet):
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return nil, ErrTokenNotValidYet
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default:
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return nil, ErrTokenInvalid
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}
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}
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if !token.Valid {
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return nil, ErrTokenInvalid
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}
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claims, ok := token.Claims.(*Claims)
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if !ok {
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return nil, ErrInvalidClaims
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}
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return claims, nil
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}
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func validateSigningOptions(secret string, expires, buffer time.Duration) error {
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if secret == "" {
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return ErrEmptySigningKey
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}
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if expires <= 0 {
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return errors.New("JWT expiration must be positive")
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}
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if buffer < 0 {
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return errors.New("JWT buffer must not be negative")
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}
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return nil
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}
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