91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
package account
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import (
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"crypto/ed25519"
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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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type JWTPurpose string
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type VerifyTokenFunc func(claim *jwt.RegisteredClaims) error
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var (
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nopVerifyFunc VerifyTokenFunc = func(claim *jwt.RegisteredClaims) error {
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return nil
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}
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ErrJWTUnexpectedClaimsType = errors.New("unexpected claims type")
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ErrJWTUnexpectedIssuer = errors.New("unexpected issuer")
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ErrJWTInvalid = errors.New("invalid JWT")
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)
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const (
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JWTPurposeLogin JWTPurpose = "login"
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JWTPurpose2FA JWTPurpose = "2fa"
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)
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func JWTGenerateToken(domain string, privateKey ed25519.PrivateKey, userID uint, purpose JWTPurpose) (string, error) {
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return JWTGenerateTokenWithDuration(domain, privateKey, userID, time.Hour*24, purpose)
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}
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func JWTGenerateTokenWithDuration(domain string, privateKey ed25519.PrivateKey, userID uint, duration time.Duration, purpose JWTPurpose) (string, error) {
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// Define the claims
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claims := jwt.RegisteredClaims{
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Issuer: domain,
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Subject: strconv.Itoa(int(userID)),
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(duration)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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Audience: []string{string(purpose)},
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}
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// Create the token
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token := jwt.NewWithClaims(jwt.SigningMethodEdDSA, claims)
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// Sign the token with the Ed25519 private key
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tokenString, err := token.SignedString(privateKey)
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if err != nil {
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return "", err
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}
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return tokenString, nil
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}
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func JWTVerifyToken(token string, domain string, privateKey ed25519.PrivateKey, verifyFunc VerifyTokenFunc) (*jwt.RegisteredClaims, error) {
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validatedToken, err := jwt.ParseWithClaims(token, &jwt.RegisteredClaims{}, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodEd25519); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
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}
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publicKey := privateKey.Public()
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return publicKey, nil
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})
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if err != nil {
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return nil, err
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}
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if verifyFunc == nil {
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verifyFunc = nopVerifyFunc
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}
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claim, ok := validatedToken.Claims.(*jwt.RegisteredClaims)
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if !ok {
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return nil, fmt.Errorf("%w: %s", ErrJWTUnexpectedClaimsType, validatedToken.Claims)
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}
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if domain != claim.Issuer {
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return nil, fmt.Errorf("%w: %s", ErrJWTUnexpectedIssuer, claim.Issuer)
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}
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err = verifyFunc(claim)
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return claim, err
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}
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