feat: add Safari bookmark and download extraction from plist (#567)

* feat: add Safari bookmark and download extraction from plist files
* test: add nested folder test for bookmark tree traversal
Part of #565

browser/safari/extract_download.go

@@ -0,0 +1,54 @@
+package safari
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/moond4rk/plist"
+
+	"github.com/moond4rk/hackbrowserdata/types"
+)
+
+// safariDownloads mirrors the plist structure of Safari's Downloads.plist.
+type safariDownloads struct {
+	DownloadHistory []safariDownloadEntry `plist:"DownloadHistory"`
+}
+
+type safariDownloadEntry struct {
+	URL                string  `plist:"DownloadEntryURL"`
+	Path               string  `plist:"DownloadEntryPath"`
+	TotalBytes         float64 `plist:"DownloadEntryProgressTotalToLoad"`
+	RemoveWhenDone     bool    `plist:"DownloadEntryRemoveWhenDoneKey"`
+	DownloadIdentifier string  `plist:"DownloadEntryIdentifier"`
+}
+
+func extractDownloads(path string) ([]types.DownloadEntry, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("open downloads: %w", err)
+	}
+	defer f.Close()
+
+	var dl safariDownloads
+	if err := plist.NewDecoder(f).Decode(&dl); err != nil {
+		return nil, fmt.Errorf("decode downloads: %w", err)
+	}
+
+	var downloads []types.DownloadEntry
+	for _, d := range dl.DownloadHistory {
+		downloads = append(downloads, types.DownloadEntry{
+			URL:        d.URL,
+			TargetPath: d.Path,
+			TotalBytes: int64(d.TotalBytes),
+		})
+	}
+	return downloads, nil
+}
+
+func countDownloads(path string) (int, error) {
+	downloads, err := extractDownloads(path)
+	if err != nil {
+		return 0, err
+	}
+	return len(downloads), nil
+}