Quickstarts explain how to set up and run an app that calls a Google Workspace API.
Google Workspace quickstarts use the API client libraries to handle some details of the authentication and authorization flow. We recommend that you use the client libraries for your own apps. This quickstart uses a simplified authentication approach that is appropriate for a testing environment. For a production environment, we recommend learning about authentication and authorization before choosing the access credentials that are appropriate for your app.
Create a Go command-line application that makes requests to the Google Classroom API.
Objectives
- Set up your environment.
- Set up the sample.
- Run the sample.
Prerequisites
- Latest version of Go.
- Latest version of Git.
- A Google Cloud project.
- A Google for Education account with Google Classroom enabled.
Set up your environment
To complete this quickstart, set up your environment.
Enable the API
Before using Google APIs, you need to turn them on in a Google Cloud project. You can turn on one or more APIs in a single Google Cloud project.In the Google Cloud console, enable the Google Classroom API.
Configure the OAuth consent screen
If you're using a new Google Cloud project to complete this quickstart, configure the OAuth consent screen and add yourself as a test user. If you've already completed this step for your Cloud project, skip to the next section.
- In the Google Cloud console, go to Menu > APIs & Services > OAuth consent screen.
- For User type select Internal, then click Create.
- Complete the app registration form, then click Save and Continue.
For now, you can skip adding scopes and click Save and Continue. In the future, when you create an app for use outside of your Google Workspace organization, you must change the User type to External, and then, add the authorization scopes that your app requires.
- Review your app registration summary. To make changes, click Edit. If the app registration looks OK, click Back to Dashboard.
Authorize credentials for a desktop application
To authenticate end users and access user data in your app, you need to create one or more OAuth 2.0 Client IDs. A client ID is used to identify a single app to Google's OAuth servers. If your app runs on multiple platforms, you must create a separate client ID for each platform.- In the Google Cloud console, go to Menu > APIs & Services > Credentials.
- Click Create Credentials > OAuth client ID.
- Click Application type > Desktop app.
- In the Name field, type a name for the credential. This name is only shown in the Google Cloud console.
- Click Create. The OAuth client created screen appears, showing your new Client ID and Client secret.
- Click OK. The newly created credential appears under OAuth 2.0 Client IDs.
- Save the downloaded JSON file as
credentials.json
, and move the file to your working directory.
Prepare the workspace
Create a working directory:
mkdir quickstart
Change to the working directory:
cd quickstart
Initialize the new module:
go mod init quickstart
Get the Google Classroom API Go client library and OAuth2.0 package:
go get google.golang.org/api/classroom/v1 go get golang.org/x/oauth2/google
Set up the sample
In your working directory, create a file named
quickstart.go
.In the file, paste the following code:
Run the sample
In your working directory, build and run the sample:
go run quickstart.go
-
The first time you run the sample, it prompts you to authorize access:
- If you're not already signed in to your Google Account, sign in when prompted. If you're signed in to multiple accounts, select one account to use for authorization.
- Click Accept.
Your Go application runs and calls the Google Classroom API.
Authorization information is stored in the file system, so the next time you run the sample code, you aren't prompted for authorization.
Next steps
- Troubleshoot authentication and authorization issues
- Classroom API reference documentation
google-api-go-client
section of GitHub