tokenGeneration.go

//SlackSignIn gives the Authentication token in return to the code
func (LoginService) SlackSignIn(ctx context.Context, code string) (token SlackTokenResponse, err error) {

	conf := &oauth2.Config{
		ClientID:     slackClientID,
		ClientSecret: slackClientSecret,
		Scopes:       slackScopes,
		Endpoint: oauth2.Endpoint{
			AuthURL:  slackAuthURL,
			TokenURL: slackTokenURL,
		},
	}
	httpClient := &http.Client{Timeout: 2 * time.Second}
	ctx = context.WithValue(ctx, oauth2.HTTPClient, httpClient)

	tok, err := conf.Exchange(ctx, code)
	if err != nil {
		log.Fatal(err)
	}

	token = SlackTokenResponse{
		AccessToken:  tok.AccessToken,
		Expiry:       tok.Expiry,
		RefreshToken: tok.RefreshToken,
		TokenType:    tok.TokenType,
	}

	client := conf.Client(ctx, tok)
	_ = client
	return token, nil
}