Better modularize clipboard code (add "clip" package; break up TOTP code

clip/clipClearProcessDROID.go

@@ -0,0 +1,36 @@
+//go:build (android && !termux) || ios
+
+package clip
+
+import (
+	"strings"
+	"time"
+
+	"github.com/rwinkhart/go-boilerplate/back"
+	"golang.design/x/clipboard"
+)
+
+// clipClearProcess clears the clipboard after 30 seconds if the clipboard contents have not changed.
+// assignedContents can be omitted to clear the clipboard immediately and unconditionally.
+func clipClearProcess(assignedContents string) error {
+	clearClipboard := func() {
+		clipboard.Write(clipboard.FmtText, []byte(""))
+		back.Exit(0)
+	}
+
+	// if assignedContents is empty, clear the clipboard immediately and unconditionally
+	if assignedContents == "" {
+		clearClipboard()
+		return nil
+	}
+
+	// wait 30 seconds before checking clipboard contents
+	time.Sleep(30 * time.Second)
+
+	newContents := clipboard.Read(clipboard.FmtText)
+
+	if assignedContents == strings.TrimRight(string(newContents), "\r\n") {
+		clearClipboard()
+	}
+	return nil
+}