120 lines
3.2 KiB
Go
120 lines
3.2 KiB
Go
package token
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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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// jwtClaims is an internal struct to satisfy jwt.Claims interface
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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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Role string `json:"role"`
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TokenID string `json:"token_id"`
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jwt.RegisteredClaims
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}
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// jwt.go implements the Provider interface using JWT
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type jwtProvider struct {
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secret string
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}
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// NewJWTProvider creates a new instance of JWT provider
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func NewJWTProvider(secret string) Provider {
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return &jwtProvider{
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secret: secret,
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}
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}
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// GenerateTokenPair generates new access and refresh tokens
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func (p *jwtProvider) GenerateTokenPair(userID, email, role string) (*TokenPair, error) {
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td := &TokenPair{}
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td.AtExpires = time.Now().Add(time.Minute * 15).Unix()
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td.AccessUUID = uuid.New().String()
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td.RtExpires = time.Now().Add(time.Hour * 24 * 7).Unix() // Expires in 7 days
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td.RefreshUUID = uuid.New().String()
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// Access Token
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atClaims := &jwtClaims{
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UserID: userID,
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Email: email,
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Role: role,
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TokenID: td.AccessUUID,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(time.Unix(td.AtExpires, 0)),
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Issuer: "stream.api",
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},
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}
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at := jwt.NewWithClaims(jwt.SigningMethodHS256, atClaims)
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var err error
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td.AccessToken, err = at.SignedString([]byte(p.secret))
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if err != nil {
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return nil, err
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}
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// Refresh Token
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// Refresh token can just be a random string or a JWT.
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// Common practice: JWT for stateless verification, or Opaque string for stateful.
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// Here we use JWT so we can carry some metadata if needed, but we check Redis anyway.
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rtClaims := jwt.MapClaims{}
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rtClaims["refresh_uuid"] = td.RefreshUUID
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rtClaims["user_id"] = userID
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rtClaims["exp"] = td.RtExpires
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rt := jwt.NewWithClaims(jwt.SigningMethodHS256, rtClaims)
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td.RefreshToken, err = rt.SignedString([]byte(p.secret))
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if err != nil {
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return nil, err
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}
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return td, nil
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}
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// ParseToken parses the access token returning Claims
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func (p *jwtProvider) ParseToken(tokenString string) (*Claims, error) {
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token, err := jwt.ParseWithClaims(tokenString, &jwtClaims{}, 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(p.secret), 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 claims, ok := token.Claims.(*jwtClaims); ok && token.Valid {
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return &Claims{
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UserID: claims.UserID,
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Email: claims.Email,
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Role: claims.Role,
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TokenID: claims.TokenID,
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}, nil
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}
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return nil, fmt.Errorf("invalid token")
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}
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// ParseMapToken parses token returning map[string]interface{} (generic)
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func (p *jwtProvider) ParseMapToken(tokenString string) (map[string]interface{}, error) {
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token, err := jwt.Parse(tokenString, 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(p.secret), 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 claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
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return claims, nil
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}
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return nil, jwt.ErrTokenInvalidClaims
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}
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