Add tree multiselection, batch actions and Markdown export

internal/api/export.go

@@ -0,0 +1,32 @@
+package api
+
+import (
+	"mime"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+func (s *Server) export(w http.ResponseWriter, r *http.Request) {
+	var body struct {
+		Paths []string `json:"paths"`
+	}
+	if !readJSON(w, r, &body) {
+		return
+	}
+	file, name, err := s.vault.Export(r.Context(), body.Paths)
+	if err != nil {
+		vaultError(w, r, err)
+		return
+	}
+	defer file.Close()
+	defer os.Remove(file.Name())
+	contentType := "application/zip"
+	if strings.HasSuffix(name, ".md") {
+		contentType = "text/markdown; charset=utf-8"
+	}
+	w.Header().Set("Content-Type", contentType)
+	w.Header().Set("Content-Disposition", mime.FormatMediaType("attachment", map[string]string{"filename": name}))
+	http.ServeContent(w, r, name, time.Time{}, file)
+}