Overview

This allows users to notify meetings/appointments via email. The form with required fields should be filled about the meeting/appointment and an email will be sent to the invitees of the meeting/appoinment along with the details. The relevant fields that are to be filled is prompted in the command line when you invoke the service through client.bal

Compatibility

	Version
Ballerina Language	0.990.3
Gmail API	v1

Obtaining Tokens to Run the program

1. Visit Google API Console, click Create Project, and follow the wizard to create a new project.
2. Go to Credentials -> OAuth consent screen, enter a product name to be shown to users, and click Save.
3. On the Credentials tab, click Create credentials and select OAuth client ID.
4. Select an application type, enter a name for the application, and specify a redirect URI (enter https://developers.google.com/oauthplayground if you want to use OAuth 2.0 playground to receive the authorization code and obtain the access token and refresh token).
5. Click Create. Your client ID and client secret appear.
6. In a separate browser window or tab, visit OAuth 2.0 playground. Click on the OAuth 2.0 configuration icon in the top right corner and click on Use your own OAuth credentials and provide your OAuth Client ID and OAuth Client secret.
7. Select the required Gmail API scopes from the list of API's, and then click Authorize APIs.
8. When you receive your authorization code, click Exchange authorization code for tokens to obtain the refresh token and access token.

You can now enter the credentials in main.bal file

string accessToken = "<Your Access Token >";
string clientId = "<Your Client ID>";
string clientSecret = "<Your Client Secret>";
string refreshToken = "<Your Refresh Token>";

Module Structure

The module structure is as follows:

Ballerina-meeting
  ├── client.bal  
  └── meeting-notifier
      └── main.bal
      └── service.bal

Procedure

1. Start the meeting notifier service

$ ballerina run meeting-notifier

2. Run the client that request the service

$ ballerina run client.bal

3. Fill out the required fields accordingly

References

Ballerina

Ballerina Gmail Connector