Integrate Google API with Salesforce

This blog will give step by step process of getting a refresh token and access token from Google API. This access token and refresh token can be used to Integrate Google API with Salesforce.

1. Create a user in Google Console
2. Create Apex/Lightning component for authorization

Create a user in Google Console

1. 1. 1. Create a user in Google Cloud at https://console.developers.google.com . We can also use any existing Gmail user.
      2. Create a project in Google Console
      3. Once the project is created, go to the API library at https://console.developers.google.com/apis/library?project=stellar-day-269401. Select any Google API which needs to be integrated.
      4. Select API and enable it for use.
      5. Create a Credential for API to be used. This credential will be used in Apex. Credentials will be created from https://console.developers.google.com/apis/credentials/wizard?project=stellar-day-269401 after the selection of the project.
      6. Authorize domain in OAuth Consent Screen. Use the Lightning URL of your org without HTTPS. You can also use the lightning community URL here.
      7. We need to set a redirect URL which will be a lighting component URL for authenticating and getting access tokens.
         
      8. Add Google API https://www.googleapis.com in the Remote Site setting.

Create Apex/Lightning component for authorization

1. Apex:

Now we have set up all pre-requisite in the Google console. Let us create a Lightning component to be used for authentication.

The below code is used to get the Google Authentication screen. Use any Gmail account for this.

public static String createAuthURL() {
        String key = EncodingUtil.urlEncode(key,'UTF-8');
        String uri = EncodingUtil.urlEncode(redirect_uri,'UTF-8');
        String authuri = '';
        authuri = authUrl+'?'+
            'client_id='+key+
            '&response_type=code'+
            '&scope='+scope+
            '&redirect_uri='+uri+
            '&access_type=offline';
        return authuri;
    }

getAccessToken is used to get access tokens and refresh tokens from Google for specific APIs.

2. Create custom metadata to store the access token

Create a custom metadata type to store access tokens for subsequent use. You can use custom settings, platform caching or custom objects based on the use case. For this blog, I have used custom metadata.

Create Custom metadata and add filed AccessToken in that to store value.

3. Lightning Component:

We have to create a page where we can redirect users after authentication. We can create a Lightning component tab or a Lighting community page for this.

This lightning component will show a Google authentication screen and get an access token with a button click.

We can use this component for all Google API authentication with salesforce. Only change the scope and redirect the URL in GoogleAuthService.

References:

Google API Library

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