Aska
aee8db9b3f
- internal/platform: cross-platform path detection, 6 tests - internal/auth: JWT generation/validation + bcrypt, 8 tests - 89 total tests, build + vet clean
103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
// Package auth provides JWT token generation and validation for the Cyrene platform.
|
|
package auth
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/golang-jwt/jwt/v5"
|
|
"golang.org/x/crypto/bcrypt"
|
|
)
|
|
|
|
// Claims represents the JWT claims for a Cyrene user.
|
|
type Claims struct {
|
|
jwt.RegisteredClaims
|
|
UserID string `json:"user_id"`
|
|
Username string `json:"username"`
|
|
Role string `json:"role"` // "admin" | "user"
|
|
}
|
|
|
|
// TokenManager handles JWT creation and validation.
|
|
type TokenManager struct {
|
|
secret []byte
|
|
expiry time.Duration
|
|
}
|
|
|
|
// NewTokenManager creates a new TokenManager.
|
|
// secret must be at least 32 characters.
|
|
func NewTokenManager(secret string, expiryHours int) *TokenManager {
|
|
return &TokenManager{
|
|
secret: []byte(secret),
|
|
expiry: time.Duration(expiryHours) * time.Hour,
|
|
}
|
|
}
|
|
|
|
// Generate creates a signed JWT token for the given user.
|
|
func (tm *TokenManager) Generate(userID, username, role string) (string, error) {
|
|
now := time.Now()
|
|
claims := &Claims{
|
|
RegisteredClaims: jwt.RegisteredClaims{
|
|
Issuer: "cyrene",
|
|
Subject: userID,
|
|
IssuedAt: jwt.NewNumericDate(now),
|
|
ExpiresAt: jwt.NewNumericDate(now.Add(tm.expiry)),
|
|
ID: generateTokenID(),
|
|
},
|
|
UserID: userID,
|
|
Username: username,
|
|
Role: role,
|
|
}
|
|
|
|
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
|
|
return token.SignedString(tm.secret)
|
|
}
|
|
|
|
// Validate parses and validates a JWT token string.
|
|
// Returns the Claims if valid, or an error.
|
|
func (tm *TokenManager) Validate(tokenStr string) (*Claims, error) {
|
|
token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(token *jwt.Token) (any, error) {
|
|
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
|
|
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
|
|
}
|
|
return tm.secret, nil
|
|
})
|
|
if err != nil {
|
|
return nil, fmt.Errorf("parse token: %w", err)
|
|
}
|
|
|
|
claims, ok := token.Claims.(*Claims)
|
|
if !ok || !token.Valid {
|
|
return nil, fmt.Errorf("invalid token")
|
|
}
|
|
|
|
return claims, nil
|
|
}
|
|
|
|
// IsAdmin checks if the claims belong to an admin user.
|
|
func (c *Claims) IsAdmin() bool {
|
|
return c.Role == "admin"
|
|
}
|
|
|
|
// HashPassword creates a bcrypt hash of the password.
|
|
func HashPassword(password string) (string, error) {
|
|
bytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
|
|
if err != nil {
|
|
return "", fmt.Errorf("hash password: %w", err)
|
|
}
|
|
return string(bytes), nil
|
|
}
|
|
|
|
// CheckPassword compares a password with its bcrypt hash.
|
|
func CheckPassword(password, hash string) bool {
|
|
err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
|
|
return err == nil
|
|
}
|
|
|
|
func generateTokenID() string {
|
|
b := make([]byte, 16)
|
|
rand.Read(b)
|
|
return hex.EncodeToString(b)
|
|
}
|