Refactor everything

internal/files/export.go

@@ -0,0 +1,74 @@
+package files
+
+import (
+	"archive/zip"
+	"io"
+	"log/slog"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+var ExportPath = "data/export.zip"  // TODO: Move to config
+
+// Export saves a .zip archive of the data folder to a file.
+func Export(filename string) error {
+	file, err := os.Create(filename)
+	if err != nil {
+		slog.Error("error creating export archive", "error", err)
+		return err
+	}
+
+	w := zip.NewWriter(file)
+	walker := func(path string, info os.FileInfo, err error) error {
+		if path == filename || filepath.Ext(path) == ".zip" { //Ignore export file itself and .zip archives
+			return nil
+		}
+		slog.Debug("export crawling", "path", path)
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		file, err := os.Open(path)
+		if err != nil {
+			return err
+		}
+
+		f, err := w.Create(path)
+		if err != nil {
+			return err
+		}
+
+		_, err = io.Copy(f, file)
+		if err != nil {
+			return err
+		}
+
+		return file.Close()
+	}
+	err = filepath.Walk("data/", walker)
+	if err != nil {
+		slog.Error("error walking files", "error", err)
+		return err
+	}
+
+	err = w.Close()
+	if err != nil {
+		return err
+	}
+	return file.Close()
+}
+
+// GetExport returns a .zip archive with contents of the data folder.
+// As a side effect, it creates the file in there.
+func GetExport(w http.ResponseWriter, r *http.Request) {
+	err := Export(ExportPath)
+	if err != nil {
+		slog.Error("error getting export archive", "error", err)
+		http.Error(w, "could not export", http.StatusInternalServerError)
+		return
+	}
+	http.ServeFile(w, r, "data/export.zip")
+}