150 lines
3.2 KiB
Go
150 lines
3.2 KiB
Go
package main
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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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"encoding/base64"
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"encoding/json"
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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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// cookieKeyPath returns the filesystem path where the local encryption key is stored.
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// The key is intentionally NOT stored in recorder_settings.json.
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func cookieKeyPath() (string, error) {
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// Prefer ./data (you already use it for models_store.db)
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p, err := resolvePathRelativeToApp("data/cookies.key")
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if err == nil && strings.TrimSpace(p) != "" {
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_ = os.MkdirAll(filepath.Dir(p), 0o755)
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return p, nil
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}
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// Fallback: next to the executable
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p2, err2 := resolvePathRelativeToApp("cookies.key")
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if err2 != nil {
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return "", err2
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}
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_ = os.MkdirAll(filepath.Dir(p2), 0o755)
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return p2, nil
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}
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func loadOrCreateCookieKey() ([]byte, error) {
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p, err := cookieKeyPath()
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if err != nil {
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return nil, err
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}
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if b, err := os.ReadFile(p); err == nil {
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// accept exactly 32 bytes, or trim if longer
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if len(b) >= 32 {
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return b[:32], nil
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}
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}
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key := make([]byte, 32)
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if _, err := io.ReadFull(rand.Reader, key); err != nil {
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return nil, err
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}
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// 0600 is best-effort; on Windows this is still fine.
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if err := os.WriteFile(p, key, 0o600); err != nil {
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return nil, err
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}
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return key, nil
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}
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func normalizeCookieMap(in map[string]string) map[string]string {
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out := map[string]string{}
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for k, v := range in {
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kk := strings.ToLower(strings.TrimSpace(k))
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vv := strings.TrimSpace(v)
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if kk == "" || vv == "" {
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continue
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}
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out[kk] = vv
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}
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return out
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}
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func encryptCookieMap(cookies map[string]string) (string, error) {
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clean := normalizeCookieMap(cookies)
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plain, err := json.Marshal(clean)
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if err != nil {
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return "", err
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}
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return encryptBytesToBase64(plain)
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}
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func decryptCookieMap(blob string) (map[string]string, error) {
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blob = strings.TrimSpace(blob)
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if blob == "" {
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return map[string]string{}, nil
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}
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plain, err := decryptBase64ToBytes(blob)
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if err != nil {
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return nil, err
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}
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var out map[string]string
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if err := json.Unmarshal(plain, &out); err != nil {
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return nil, err
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}
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return normalizeCookieMap(out), nil
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}
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func encryptBytesToBase64(plain []byte) (string, error) {
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key, err := loadOrCreateCookieKey()
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(key)
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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, plain, nil)
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buf := append(nonce, ciphertext...)
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return base64.StdEncoding.EncodeToString(buf), nil
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}
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func decryptBase64ToBytes(blob string) ([]byte, error) {
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key, err := loadOrCreateCookieKey()
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if err != nil {
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return nil, err
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, 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 nil, err
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}
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buf, err := base64.StdEncoding.DecodeString(blob)
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if err != nil {
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return nil, err
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}
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ns := gcm.NonceSize()
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if len(buf) < ns {
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return nil, fmt.Errorf("encrypted cookies: invalid length")
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}
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nonce := buf[:ns]
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ciphertext := buf[ns:]
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plain, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, err
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}
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return plain, nil
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}
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