Add error checking for URL validity

db/bookmarks.go

@@ -1,9 +1,11 @@
 package db
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"log"
+	"strings"
 	"sync"
 	"time"
 
@@ -32,6 +34,12 @@ func NewBookmarkManager(db *DB) *BookmarkManager {
 // if this bookmark already exists (based on URL match).
 // The entity.Bookmark ID field will be updated.
 func (m *BookmarkManager) AddBookmark(bm *entity.Bookmark) error {
+
+	if strings.Index(bm.URL, "https://") != 0 &&
+		strings.Index(bm.URL, "http://") != 0 {
+		return errors.New("URL must begin with http:// or https://")
+	}
+
 	existing := entity.Bookmark{}
 	err := m.db.store.FindOne(&existing, bolthold.Where("URL").Eq(bm.URL))
 	if err != bolthold.ErrNotFound {

web/web.go

@@ -205,6 +205,13 @@ func Create(bmm *db.BookmarkManager, cmm *db.ConfigManager) *Server {
 			"bm":    bm,
 			"error": err,
 		}
+
+		if err != nil {
+			data["url"] = url
+			data["tags"] = tags
+			data["tags_hidden"] = c.PostForm("tags_hidden")
+		}
+
 		c.HTML(http.StatusOK, "add_url_form.html", data)
 	})
 	r.POST("/add_bulk", func(c *gin.Context) {