From d16737954621485f93c0597794792be67adf2244 Mon Sep 17 00:00:00 2001
From: Radhi Fadlillah <m.radhi.f@gmail.com>
Date: Mon, 5 Mar 2018 21:35:01 +0700
Subject: [PATCH] Clear UTM parameters from URL

---
 cmd/add.go    | 26 ++++++++++++++++++++++++++
 cmd/update.go |  7 +++++++
 2 files changed, 33 insertions(+)

diff --git a/cmd/add.go b/cmd/add.go
index 94735e53..0497b17e 100644
--- a/cmd/add.go
+++ b/cmd/add.go
@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"html/template"
+	nurl "net/url"
 	"strings"
 	"time"
 
@@ -59,6 +60,12 @@ func addBookmark(base model.Bookmark, offline bool) (book model.Bookmark, err er
 	// Prepare initial result
 	book = base
 
+	// Clear UTM parameters from URL
+	book.URL, err = clearUTMParams(book.URL)
+	if err != nil {
+		return book, err
+	}
+
 	// Fetch data from internet
 	if !offline {
 		article, err := readability.Parse(book.URL, 10*time.Second)
@@ -94,3 +101,22 @@ func addBookmark(base model.Bookmark, offline bool) (book model.Bookmark, err er
 func normalizeSpace(str string) string {
 	return strings.Join(strings.Fields(str), " ")
 }
+
+func clearUTMParams(uri string) (string, error) {
+	tempURL, err := nurl.Parse(uri)
+	if err != nil {
+		return "", err
+	}
+
+	newQuery := nurl.Values{}
+	for key, value := range tempURL.Query() {
+		if strings.HasPrefix(key, "utm_") {
+			continue
+		}
+
+		newQuery[key] = value
+	}
+
+	tempURL.RawQuery = newQuery.Encode()
+	return tempURL.String(), nil
+}
diff --git a/cmd/update.go b/cmd/update.go
index 3dbf5702..75baba74 100644
--- a/cmd/update.go
+++ b/cmd/update.go
@@ -82,6 +82,13 @@ func init() {
 
 func updateBookmarks(indices []string, url, title, excerpt string, tags []string, offline bool) ([]model.Bookmark, error) {
 	mutex := sync.Mutex{}
+
+	// Clear UTM parameters from URL
+	url, err := clearUTMParams(url)
+	if err != nil {
+		return []model.Bookmark{}, err
+	}
+
 	// Read bookmarks from database
 	bookmarks, err := DB.GetBookmarks(true, indices...)
 	if err != nil {