Step by Step Guide to Building a OneNote API Integration in Go

Aug 2, 2024 • 6 minute read

Introduction

Hey there, fellow Go enthusiast! Ready to dive into the world of OneNote API integration? You're in for a treat! We'll be using the awesome msgraph-sdk-go package to make our lives easier. This guide assumes you're already familiar with Go and have a knack for APIs, so we'll keep things snappy and to the point.

Prerequisites

Before we jump in, make sure you've got:

Go installed on your machine
A Microsoft Azure account (if you don't have one, now's the time to get it!)
Your Go and REST API skills polished and ready to go

Setting up the project

Let's kick things off by creating a new Go project and grabbing the msgraph-sdk-go package:

mkdir onenote-integration && cd onenote-integration
go mod init onenote-integration
go get github.com/microsoftgraph/msgraph-sdk-go

Registering the application in Azure AD

Head over to the Azure Portal and register your application. You'll need to:

Create a new app registration
Set up the required permissions for OneNote API
Grab your client ID and create a client secret

Keep these handy; we'll need them soon!

Authenticating with Microsoft Graph

Time to implement the OAuth 2.0 flow. Here's a quick snippet to get you started:

import (
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
    "github.com/microsoftgraph/msgraph-sdk-go"
)

cred, err := azidentity.NewClientSecretCredential(tenantID, clientID, clientSecret, nil)
if err != nil {
    panic(err)
}

client, err := msgraph.NewGraphServiceClientWithCredentials(cred, []string{"https://graph.microsoft.com/.default"})
if err != nil {
    panic(err)
}

Initializing the Graph client

With the authentication sorted, you're ready to initialize the Graph client:

graphClient := client

Basic OneNote operations

Now for the fun part! Let's play with some OneNote operations:

Fetching notebooks

notebooks, err := graphClient.Me().Onenote().Notebooks().Get(context.Background(), nil)
if err != nil {
    panic(err)
}

for _, notebook := range notebooks.GetValue() {
    fmt.Printf("Notebook: %s\n", *notebook.GetDisplayName())
}

Creating a new page

content := "<html><head><title>New Page</title></head><body><p>Hello, OneNote!</p></body></html>"
newPage, err := graphClient.Me().Onenote().Pages().CreatePageInSectionWithBody(context.Background(), sectionID, []byte(content), nil)
if err != nil {
    panic(err)
}
fmt.Printf("New page created: %s\n", *newPage.GetTitle())

Updating page content

updatedContent := "<html><head><title>Updated Page</title></head><body><p>Updated content!</p></body></html>"
err = graphClient.Me().Onenote().Pages().Item(pageID).Content().Patch(context.Background(), []byte(updatedContent), nil)
if err != nil {
    panic(err)
}

Deleting a page

err = graphClient.Me().Onenote().Pages().Item(pageID).Delete(context.Background(), nil)
if err != nil {
    panic(err)
}

Error handling and best practices

Always wrap your API calls in proper error handling. The msgraph-sdk-go package provides detailed error information, so make use of it!

Also, keep an eye on rate limits. Microsoft Graph API has some restrictions, so be a good citizen and implement proper backoff and retry logic.

Advanced features (optional)

Want to take it up a notch? Try working with sections and section groups, implementing search functionality, or handling attachments. The msgraph-sdk-go package has got you covered for all these advanced features!

Conclusion

And there you have it! You've just built a OneNote API integration in Go. Pretty cool, right? Remember, this is just scratching the surface. The OneNote API and msgraph-sdk-go package have a ton more to offer.

For more in-depth info, check out the Microsoft Graph documentation and the msgraph-sdk-go GitHub repo.

Now go forth and build some awesome OneNote integrations! Happy coding!