107 lines
2.8 KiB
Go
107 lines
2.8 KiB
Go
package config
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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)
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type Config struct {
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DataDir string
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DatabasePath string
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UploadDir string
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JWTSecret string
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EncryptionKey []byte
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}
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func New(dataDir string) *Config {
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// 确保data目录存在
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os.MkdirAll(dataDir, 0755)
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// 创建上传目录
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uploadDir := filepath.Join(dataDir, "uploads")
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os.MkdirAll(uploadDir, 0755)
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// 从环境变量获取JWT密钥，如果没有则使用默认值
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jwtSecret := os.Getenv("JWT_SECRET")
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if jwtSecret == "" {
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jwtSecret = "your-secret-key-change-in-production"
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}
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encryptionSource := os.Getenv("CONFIG_ENCRYPTION_KEY")
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if encryptionSource == "" {
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// Keep existing installations decryptable while allowing production deployments
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// to use a dedicated key that is independent from JWT signing.
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encryptionSource = jwtSecret
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}
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encryptionKey := sha256.Sum256([]byte(encryptionSource))
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return &Config{
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DataDir: dataDir,
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DatabasePath: filepath.Join(dataDir, "home.db"),
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UploadDir: uploadDir,
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JWTSecret: jwtSecret,
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EncryptionKey: encryptionKey[:],
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}
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}
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// EncryptSecret encrypts a value for storage in the application database.
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func (c *Config) EncryptSecret(value string) (string, error) {
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if strings.TrimSpace(value) == "" {
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return "", nil
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}
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block, err := aes.NewCipher(c.EncryptionKey)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nil, nonce, []byte(value), nil)
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encoded := base64.RawStdEncoding.EncodeToString(append(nonce, ciphertext...))
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return "v1:" + encoded, nil
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}
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// DecryptSecret decrypts a value previously returned by EncryptSecret.
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func (c *Config) DecryptSecret(value string) (string, error) {
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if strings.TrimSpace(value) == "" {
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return "", nil
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}
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if !strings.HasPrefix(value, "v1:") {
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return "", errors.New("unsupported encrypted secret format")
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}
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raw, err := base64.RawStdEncoding.DecodeString(strings.TrimPrefix(value, "v1:"))
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if err != nil {
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return "", fmt.Errorf("decode encrypted secret: %w", err)
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}
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block, err := aes.NewCipher(c.EncryptionKey)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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if len(raw) < gcm.NonceSize() {
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return "", errors.New("encrypted secret is too short")
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}
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plaintext, err := gcm.Open(nil, raw[:gcm.NonceSize()], raw[gcm.NonceSize():], nil)
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if err != nil {
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return "", errors.New("encrypted secret authentication failed")
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}
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return string(plaintext), nil
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}
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