feat: retrieve modified file paths using hashes

internal/utils/file.go

@@ -1,6 +1,13 @@
 package utils
 
-import "os"
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+)
 
 func FileExists(path string) bool {
 	info, err := os.Stat(path)
@@ -15,3 +22,52 @@ func DeleteFile(path string) error {
 
 	return os.Remove(path)
 }
+
+func GetFileHash(path string) (string, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+
+	hash := sha256.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf("%x", hash.Sum(nil)), nil
+}
+
+func FindFileByHash(root, targetHash string) (string, error) {
+	var found string
+
+	if err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+
+		f, err := os.Open(path)
+		if err != nil {
+			return nil
+		}
+		defer f.Close()
+
+		h := sha256.New()
+		if _, err := io.Copy(h, f); err != nil {
+			return nil
+		}
+		sum := hex.EncodeToString(h.Sum(nil))
+		if sum == targetHash {
+			found = path
+			return filepath.SkipDir
+		}
+		return nil
+	}); err != nil {
+		return "", err
+	}
+
+	return found, nil
+}