84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
package auth
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import (
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"fmt"
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"time"
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"github.com/golang-jwt/jwt/v5"
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"github.com/google/uuid"
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)
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// JWTService handles JWT token generation and validation
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type JWTService struct {
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secret []byte
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expiration time.Duration
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}
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// NewJWTService creates a new JWTService
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func NewJWTService(secret string, expiration time.Duration) *JWTService {
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return &JWTService{
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secret: []byte(secret),
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expiration: expiration,
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}
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}
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// Claims represents JWT claims
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type Claims struct {
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UserID string `json:"user_id"`
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Email string `json:"email"`
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Role string `json:"role"`
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jwt.RegisteredClaims
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}
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// GenerateToken generates a JWT token for a user
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func (s *JWTService) GenerateToken(userID uuid.UUID, email string) (string, time.Time, error) {
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return s.GenerateTokenWithRole(userID, email, "user")
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}
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// GenerateTokenWithRole generates a JWT token for a user with a specific role
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func (s *JWTService) GenerateTokenWithRole(userID uuid.UUID, email, role string) (string, time.Time, error) {
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expiresAt := time.Now().Add(s.expiration)
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// Default role to "user" if not specified
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if role == "" {
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role = "user"
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}
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claims := &Claims{
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UserID: userID.String(),
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Email: email,
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Role: role,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(expiresAt),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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NotBefore: jwt.NewNumericDate(time.Now()),
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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tokenString, err := token.SignedString(s.secret)
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if err != nil {
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return "", time.Time{}, fmt.Errorf("failed to sign token: %w", err)
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}
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return tokenString, expiresAt, nil
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}
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// ValidateToken validates a JWT token and returns the claims
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func (s *JWTService) ValidateToken(tokenString string) (*Claims, error) {
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token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (any, 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 s.secret, nil
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})
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if err != nil {
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return nil, fmt.Errorf("failed to parse token: %w", err)
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}
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claims, ok := token.Claims.(*Claims)
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if !ok || !token.Valid {
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return nil, fmt.Errorf("invalid token")
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}
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return claims, nil
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}
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