Example of adding a password to a specific presentation in Go

main.go

package main

import (
	"math/rand"
	"path/filepath"
	"time"

	"github.com/go-ole/go-ole"
	"github.com/go-ole/go-ole/oleutil"
	"github.com/scjalliance/comshim"
)

// Specifies a tri-state Boolean value
const (
	msoTrue int = iota - 1
	msoFalse
)

const (
	letterBytes  = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	specialBytes = "!#$%&()*+-./:;<=>?@[]^_`{|}~"
	numberBytes  = "0123456789"
)

func init() {
	rand.New(rand.NewSource(time.Now().UnixNano()))
}

func main() {
	comshim.Add(1)
	defer comshim.Done()

	unknown, err := oleutil.CreateObject("PowerPoint.Application")
	if err != nil {
		panic(err)
	}
	defer func() {
		_ = unknown.Release()
		unknown = nil
	}()

	app, err := unknown.QueryInterface(ole.IID_IDispatch)
	if err != nil {
		panic(err)
	}
	defer func() {
		_ = app.Release()
		app = nil
	}()

	presentations := oleutil.MustGetProperty(app, "Presentations")
	defer presentations.Clear()

	fileName, err := filepath.Abs("file.pptx")
	if err != nil {
		panic(err)
	}
	presentation, err := oleutil.CallMethod(presentations.ToIDispatch(), "Open", fileName, msoFalse, msoFalse, msoFalse)
	if err != nil {
		panic(err)
	}
	defer presentation.Clear()

	password := generatePassword(16, true, false, true)
	_ = oleutil.MustPutProperty(presentation.ToIDispatch(), "Password", password)
	_ = oleutil.MustCallMethod(presentation.ToIDispatch(), "Save")
	_ = oleutil.MustCallMethod(presentation.ToIDispatch(), "Close")
	println(password)
}

func generatePassword(length int, useLetters, useSpecial, useNumber bool) string {
	b := make([]byte, length)
	password := make([]byte, 0)

	if useLetters {
		password = append(password, letterBytes...)
	}
	if useSpecial {
		password = append(password, specialBytes...)
	}
	if useNumber {
		password = append(password, numberBytes...)
	}

	for i := range b {
		b[i] = password[rand.Intn(len(password))]
	}

	return string(b)
}