146 lines
3.9 KiB
Go
146 lines
3.9 KiB
Go
// Package auth provides authentication and authorization functionality
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package auth
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import (
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"crypto/rand"
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"encoding/base64"
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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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var (
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ErrInvalidToken = errors.New("invalid token")
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ErrExpiredToken = errors.New("token has expired")
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)
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// TokenPair contains access and refresh tokens
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type TokenPair struct {
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AccessToken string `json:"access_token"`
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RefreshToken string `json:"refresh_token"`
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TokenType string `json:"token_type"`
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ExpiresIn int64 `json:"expires_in"`
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}
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// Claims represents JWT claims for access tokens
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type Claims struct {
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jwt.RegisteredClaims
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Type string `json:"type"`
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Email string `json:"email,omitempty"`
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}
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// JWTManager handles JWT token operations
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type JWTManager struct {
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secretKey []byte
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accessTokenExpiry time.Duration
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refreshTokenExpiry time.Duration
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}
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// NewJWTManager creates a new JWT manager
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func NewJWTManager(secret string) *JWTManager {
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return &JWTManager{
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secretKey: []byte(secret),
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accessTokenExpiry: time.Hour,
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refreshTokenExpiry: 30 * 24 * time.Hour,
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}
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}
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// GenerateTokenPair creates a new access/refresh token pair
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func (m *JWTManager) GenerateTokenPair(developerID, email string) (*TokenPair, error) {
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accessToken, err := m.generateToken(developerID, email, "access", m.accessTokenExpiry)
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if err != nil {
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return nil, fmt.Errorf("generate access token: %w", err)
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}
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refreshToken, err := m.generateToken(developerID, email, "refresh", m.refreshTokenExpiry)
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if err != nil {
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return nil, fmt.Errorf("generate refresh token: %w", err)
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}
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return &TokenPair{
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AccessToken: accessToken,
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RefreshToken: refreshToken,
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TokenType: "Bearer",
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ExpiresIn: int64(m.accessTokenExpiry.Seconds()),
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}, nil
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}
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func (m *JWTManager) generateToken(subject, email, tokenType string, expiry time.Duration) (string, error) {
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now := time.Now()
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claims := Claims{
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RegisteredClaims: jwt.RegisteredClaims{
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Subject: subject,
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IssuedAt: jwt.NewNumericDate(now),
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ExpiresAt: jwt.NewNumericDate(now.Add(expiry)),
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Issuer: "mosis-portal",
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},
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Type: tokenType,
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Email: email,
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString(m.secretKey)
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}
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// ValidateAccessToken validates an access token and returns the claims
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func (m *JWTManager) ValidateAccessToken(tokenString string) (*Claims, error) {
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return m.validateToken(tokenString, "access")
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}
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// ValidateRefreshToken validates a refresh token and returns the claims
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func (m *JWTManager) ValidateRefreshToken(tokenString string) (*Claims, error) {
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return m.validateToken(tokenString, "refresh")
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}
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func (m *JWTManager) validateToken(tokenString, expectedType string) (*Claims, error) {
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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 m.secretKey, nil
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})
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if err != nil {
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if errors.Is(err, jwt.ErrTokenExpired) {
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return nil, ErrExpiredToken
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}
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return nil, ErrInvalidToken
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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, ErrInvalidToken
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}
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if claims.Type != expectedType {
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return nil, ErrInvalidToken
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}
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return claims, nil
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}
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// GenerateAPIKey generates a new API key with the given prefix
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func GenerateAPIKey(prefix string) (string, error) {
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// Generate 32 random bytes
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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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// Encode as base64url (no padding)
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encoded := base64.RawURLEncoding.EncodeToString(bytes)
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return fmt.Sprintf("%s_%s", prefix, encoded), nil
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}
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// GenerateState generates a random state for OAuth
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func GenerateState() (string, error) {
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bytes := make([]byte, 16)
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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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return base64.RawURLEncoding.EncodeToString(bytes), nil
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}
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