This quick-start sample app is built in Go and lets you get started with the Google+ platform in a few minutes. The app demonstrates:
- Using the Google+ Sign-In button to get an OAuth 2.0 refresh token.
- Exchanging the refresh token for an access token.
- Making Google+ API requests with the access token, including getting a list of people that the user has circled.
- Disconnecting the app from the user's Google account and revoking tokens.
Step 1: Enable the Google+ API
- Go to the Google Developers Console .
From the project drop-down, select an existing
or create a new one by selecting Create a new project.
Note: Use a single project to hold all platform instances of your app (Android, iOS, web, etc.), each with a different Client ID.
Enable the Google+ API service:
- In the list of Google APIs, search for the Google+ API service.
- Select Google+ API from the results list.
- Press the Enable API button. Wait for the API to be enabled.
In the sidebar under "API Manager", select Credentials, then select
the OAuth consent screen tab.
- Choose an Email Address, specify a Product Name, and press Save.
- In the Credentials tab, select the New credentials drop-down list, and choose OAuth client ID.
Under Application type, select Web application.
Register the origins from which your app is allowed to access the Google APIs, as follows. An origin is a unique combination of protocol, hostname, and port.
for your app. You can enter multiple origins to allow for your app to run on different
protocols, domains, or subdomains. You cannot use wildcards. In the example below,
the second URL could be a production URL.
- Press the Create button.
- From the resulting OAuth client dialog box, copy the Client ID and Client secret. The Client ID lets your app access enabled Google APIs.
Step 2: Set up the Go quick-start app
Get the latest version of the quick-start. One way is to use git to clone the application repository:
git clone https://github.com/googleplus/gplus-quickstart-go.git
Or, download the application as a zip file, and extract the quick-start code:
wget https://github.com/googleplus/gplus-quickstart-go/archive/master.zip -o gplus-quickstart-go.zip unzip gplus-quickstart-go.zip
Change directory into the quick-start app:
YOUR_CLIENT_SECRETwith the values that you generated in Step 1.
Step 3: Install the necessary libraries for Go
Download and install the Google+ API library for Go:
go get github.com/google/google-api-go-client/plus/v1
Download and install the OAuth 2.0 library:
go get golang.org/x/oauth2 go get golang.org/x/oauth2/google
Download and install the Gorilla web toolkit to manage sessions:
go get github.com/gorilla/sessions
Step 4: Run the quick-start app
Now that you have set up your Google Developers Console project and configured the quick-start app, the app is ready to run.
Because you registered
http://localhost:4567 as a Web origin in the
Google Developers Console, you will run the sample from that
Run the Go quick-start app:
go run main.go
Browse to your quick-start app, which by default is at http://localhost:4567.
Clicking Disconnect from Google+ results in the server making a call to Google to revoke the refresh token. The server then removes any data that it acquired from Google about the user to disconnect the app and follow the developer policies.