Integration with Google using Grails Oauth Plugin

We have seen the steps to connect with following oauth providers using Grails Oauth plugin in our previous posts:

Following are the simple steps to integrate Google plus in you grails application:

Step 1 : Install the Oauth plugin
Open BuildConfig.groovy and add the following dependency inside plugins section :

compile ":oauth:2.1.0"

1	compile ":oauth:2.1.0"

Step 2 : Sign up as Google developer and create a new application
Go to the link and complete the application form.
After successfully creating the app go to “APIs” sub-menu in “APIs & auth” menu and ON google+ API.

Google APIs Screen

And go to “Credentials” menu and create new client id after that you got “Client ID” and “Client secret”.

Google App Keys

Step 3 : Add Config values in Config.groovy
Add following code in you Config file:

oauth {
 providers {
  google {
   api = org.scribe.builder.api.GoogleApi
   key = 'YOUR Client ID'
   secret = 'YOUR Client secret'
   
   scope = 'https://www.googleapis.com/auth/userinfo.profile'

   callback = "http://localhost:8080/grailsOauthPluginDemo/oauth/google/callback"
   successUri = "http://localhost:8080/grailsOauthPluginDemo/oauthCallBack/google"
   failureUri = "http://localhost:8080/grailsOauthPluginDemo/oauthCallBack/failure"
  }
 }
}

grails.google.api.url="https://www.googleapis.com/oauth2/v1/userinfo"

oauth {

providers {

google {

api = org.scribe.builder.api.GoogleApi

key = 'YOUR Client ID'

secret = 'YOUR Client secret'

scope = 'https://www.googleapis.com/auth/userinfo.profile'

callback = "http://localhost:8080/grailsOauthPluginDemo/oauth/google/callback"

successUri = "http://localhost:8080/grailsOauthPluginDemo/oauthCallBack/google"

failureUri = "http://localhost:8080/grailsOauthPluginDemo/oauthCallBack/failure"

}

grails.google.api.url="https://www.googleapis.com/oauth2/v1/userinfo"

NOTE:- http://localhost:8080/grailsOauthPluginDemo is my server URL, replace it with yours.

Step 4 : Add google link in your page
Add oauth:connect tag of oauth plugin tag library to create a link to Google+.

<oauth:connect provider="google">Google</oauth:connect>

Step 5 : Add handler for google response
Final step is to create action to handle the response returned by the Google+ after successful authentication

import org.scribe.model.Token
 
class OauthCallBackController {
  def google() {
    Token token = (Token) session[oauthService.findSessionKeyForAccessToken('google')]
    def googleResource = oauthService.getGoogleResource(token,
               grailsApplication.config.grails.google.api.url)
    def googleResponse = JSON.parse(googleResource?.getBody())

    log.info "token = ${token}"
    log.info "googleResponse = ${googleResponse}"
    log.info "accesstoken = ${token.token}"
    log.info "id = ${googleResponse.id}"
    log.info "name = ${googleResponse.name}"

    //Your code here
  }
}

import org.scribe.model.Token

class OauthCallBackController {

def google() {

Token token = (Token) session[oauthService.findSessionKeyForAccessToken('google')]

def googleResource = oauthService.getGoogleResource(token,

grailsApplication.config.grails.google.api.url)

def googleResponse = JSON.parse(googleResource?.getBody())

log.info "token = ${token}"

log.info "googleResponse = ${googleResponse}"

log.info "accesstoken = ${token.token}"

log.info "id = ${googleResponse.id}"

log.info "name = ${googleResponse.name}"

//Your code here

}

You can get working code in the repository Grails Oauth Plugin Demo.

That’s all. Hope this helps. 🙂

Integration with Google using Grails Oauth Plugin

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