146 lines
3.8 KiB
Go
146 lines
3.8 KiB
Go
package auth
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import (
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"crypto/rand"
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"encoding/hex"
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"errors"
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"fmt"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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// JWTManager handles JWT token creation and verification
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type JWTManager struct {
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secretKey string
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issuer string
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duration time.Duration
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}
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// JWTClaims represents custom JWT claims
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type JWTClaims struct {
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UserID string `json:"user_id"`
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Email string `json:"email"`
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Username string `json:"username"`
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jwt.RegisteredClaims
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}
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// RefreshTokenClaims represents refresh token claims
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type RefreshTokenClaims struct {
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UserID string `json:"user_id"`
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jwt.RegisteredClaims
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}
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// NewJWTManager creates a new JWT manager
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func NewJWTManager(secretKey, issuer string, duration time.Duration) *JWTManager {
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return &JWTManager{
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secretKey: secretKey,
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issuer: issuer,
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duration: duration,
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}
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}
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// GenerateAccessToken generates a new access token
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func (m *JWTManager) GenerateAccessToken(userID, email, username string) (string, error) {
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claims := JWTClaims{
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UserID: userID,
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Email: email,
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Username: username,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(m.duration)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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Issuer: m.issuer,
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString([]byte(m.secretKey))
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}
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// GenerateRefreshToken generates a new refresh token
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func (m *JWTManager) GenerateRefreshToken(userID string) (string, error) {
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claims := RefreshTokenClaims{
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UserID: userID,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * time.Hour * 7)), // 7 days
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IssuedAt: jwt.NewNumericDate(time.Now()),
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Issuer: m.issuer,
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString([]byte(m.secretKey))
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}
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// VerifyAccessToken verifies and parses an access token
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func (m *JWTManager) VerifyAccessToken(tokenString string) (*JWTClaims, error) {
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claims := &JWTClaims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
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}
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return []byte(m.secretKey), 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 !token.Valid {
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return nil, errors.New("invalid token")
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}
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return claims, nil
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}
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// VerifyRefreshToken verifies and parses a refresh token
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func (m *JWTManager) VerifyRefreshToken(tokenString string) (*RefreshTokenClaims, error) {
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claims := &RefreshTokenClaims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
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}
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return []byte(m.secretKey), 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 !token.Valid {
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return nil, errors.New("invalid token")
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}
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return claims, nil
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}
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// GenerateRandomToken generates a random token for password reset, etc.
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func GenerateRandomToken(length int) (string, error) {
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token := make([]byte, length)
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if _, err := rand.Read(token); err != nil {
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return "", err
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}
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return hex.EncodeToString(token), nil
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}
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// GeneratePKCEChallenge generates a PKCE code challenge
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func GeneratePKCEChallenge() (codeVerifier, codeChallenge string, err error) {
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bytes := make([]byte, 32)
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if _, err := rand.Read(bytes); err != nil {
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return "", "", err
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}
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codeVerifier = hex.EncodeToString(bytes)
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// For code_challenge, we'd need base64url encoding of SHA256(verifier)
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// For simplicity in this example, using hex, but in production use base64url(sha256(verifier))
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codeChallenge = codeVerifier
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return
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}
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// GenerateStateToken generates a state token for OAuth/OIDC flows
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func GenerateStateToken() (string, error) {
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return GenerateRandomToken(16)
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}
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