request<\/a> module to proxy all other traffic to Sync Gateway.<\/p>\n\n\n\nInstall the following Node.js modules:<\/p>\n\n\n
[crayon lang=”bash”]$ npm install express body-parser request –save[\/crayon]<\/p>\n\n\n\n
Create a new file called server.js<\/strong> and add the following:<\/p>\n\n\n[crayon lang=”javascript”]\/\/ 1
\nvar express = require(‘express’)
\n , bodyParser = require(‘body-parser’)
\n , request = request(‘request’).defaults({json: true});<\/p>\n
\/\/ 2
\nvar app = express();
\napp.use(‘\/google_signin’, bodyParser.json());<\/p>\n
app.post(‘\/google_signin’, function (req, res) {
\n \/\/ TODO: handle login request
\n});<\/p>\n
\/\/ 3
\napp.all(‘*’, function (req, res) {
\n var url = ‘https:\/\/0.0.0.0:4984’ + req.url;
\n req.pipe(request(url)).pipe(res);
\n});<\/p>\n
\/\/ 4
\nvar server = app.listen(8000, function () {
\n var host = server.address().address;
\n var port = server.address().port;<\/p>\n
console.log(‘App listening at https:\/\/%s:%s’, host, port);
\n});[\/crayon]<\/p>\n\n\n\n
Here are the different things happening:<\/p>\n\n\n\n
\n- Require the Node.js module you installed previously.<\/li>\n\n\n
- Instantiate a new instance of express and use the bodyParser<\/strong> middleware only for the \/google_signin<\/strong> endpoint.<\/li>\n\n\n
- Proxy all other requests to Sync Gateway.<\/li>\n\n\n
- Start the Node.js web server on port 8000.<\/li>\n\n<\/ol>\n\n\n\n
Start the server with $ node server.js<\/code> and open https:\/\/localhost:8000<\/code> in your browser. You should see the Sync Gateway welcome message:<\/p>\n\n\n\n![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/server-root.png\")
<\/p>\n\n\n\n
From Google SignIn to Sync Gateway Sessions<\/h3>\n\n\n\n
With the reverse proxy in place you can now add some code to handle the Google SignIn request and return the session credentials:<\/p>\n\n\n\n
![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/google-sign-in.png\")
<\/p>\n\n\n\n
A few things are happening on this diagram:<\/p>\n\n\n\n
\n- Black<\/strong> sends the Google user ID to the App Server.<\/li>\n\n\n
- Blue<\/strong> checks if a user exists in Sync Gateway with that user ID.<\/li>\n\n\n
- Orange<\/strong> creates the user if it doesn\u2019t already exist (typically the first time the user logs in with Google in your app).<\/li>\n\n\n
- Green<\/strong> creates a session, the response will contain session credentials that can be passed to the client iOS app for push\/pull replications. All of the Couchbase Lite SDKs have a method to specify session credentials to be used in push\/pull replications.<\/li>\n\n<\/ul>\n\n\n\n
In the \/google_signin<\/strong> handler, add the following:<\/p>\n\n\n[crayon lang=”javascript”]\/** URL of the Sync Gateway instance running locally *\/
\nvar stringURL = ‘https:\/\/0.0.0.0:4985\/simple-login’;<\/p>\n
\/** Given the name of a user that exists in Sync Gateway, create a new session *\/
\nvar sessionRequest = function (name, callback) {
\nreturn request({
\n method: ‘POST’,
\n url: stringURL + ‘\/_session’,
\n json: true,
\n body: {
\n name: name
\n }
\n}, callback);
\n};<\/p>\n
var json = req.body;
\nvar name = json.auth_provider + ‘-‘ + json.user_id.toString();
\nrequest
\n\/** Check if the user already exists *\/
\n.get(stringURL + ‘\/_user\/’ + name)
\n.on(‘response’, function (userExistsResponse) {
\n if (userExistsResponse.statusCode === 404) {
\n \/** If the user doesn’t exist, create one with the Google user ID as the name *\/
\n return request
\n .put({
\n url: stringURL + ‘\/_user\/’ + name,
\n json: true,
\n body: {
\n name: name,
\n password: Math.random.toString(36).substr(2)
\n }
\n })
\n .on(‘response’, function (createUserResponse) {
\n if (createUserResponse.statusCode === 201) {
\n \/** If the user was created successfully, create the session *\/
\n sessionRequest(name, function (sessionError, sessionResponse, body) {
\n res.send(body);
\n });
\n }
\n });
\n }
\n \/** The user already exists, simply create a new session *\/
\n sessionRequest(name, function (sessionError, sessionResponse, body) {
\n res.send(body);
\n });
\n});[\/crayon]<\/p>\n\n\n\n
Restart the Node.js application and run the following curl request to sign up a new user:<\/p>\n\n\n
[crayon lang=”bash”]$ curl -vX POST
\n -H ‘Content-Type: application\/json’
\n https:\/\/localhost:8000\/google_signin
\n -d ‘{“user_id”: “123”, “auth_provider”: “google”}’<\/p>\n
\/\/ Response
\n{
\n “session_id”:”8520c19159a4154abf5fb9b9003ff9677e035929″,
\n “expires”:”2015-10-13T12:48:05.879325313+01:00″,
\n “cookie_name”:”SyncGatewaySession”
\n}[\/crayon]<\/p>\n\n\n\n
In the next section, you will create a simple a iOS app with Swift 2 to use the new functionality of your App Server.<\/p>\n\n\n\n
Swift Time: Simple Login Screen for iOS<\/h2>\n\n\n\n
Switch to Xcode and create a new project with the Single View Application<\/strong> template:<\/p>\n\n\n\n![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/xcode-new-project.png\")
<\/p>\n\n\n\n
We\u2019ll use Cocoapods to install dependencies in this project. Close the Xcode project and from the command line run $ pod init<\/code> to migrate your project to using Cocoapods. Open the Podfile<\/strong> and add the statements:<\/p>\n\n\n[crayon lang=”none”]pod ‘Google\/SignIn’
\npod ‘couchbase-lite-ios'[\/crayon]<\/p>\n\n\n\n
Run $ pod install<\/code> and open the SimpleLogin.xcworkspace<\/strong> file that was generated. Next, you will add a bridging header to access the Google SignIn and CouchbaseLite SDKs that use Objective-C from your Swift code. In the Xcode project navigator, right-click on SimpleLogin and select New File\u2026<\/strong>. Choose the Header File template and call it bridging-header.h<\/strong>. Add the following import statements:<\/p>\n\n\n[crayon lang=”objectivec”]#import
\n#import [\/crayon]<\/p>\n\n\n\nNow you need to tell Xcode to use this file. In the SimpleLogin<\/strong> target, select the Build Settings<\/strong> tab and scroll down to the Objective-C Bridging Header<\/strong>. Add this filepath:<\/p>\n\n\n\nSimpleLogin\/bridging-header.h<\/p>\n\n\n\n
Google Sign-In Configuration file<\/h3>\n\n\n\n
Before you can use the Sign-In SDK in your app, you\u2019ll need to create a new project in the Google Developer Console and generate a client ID. Luckily for us, this can be done automatically with the following link:<\/p>\n\n\n\n
https:\/\/developers.google.com\/mobile\/add?platform=ios&cntapi=signin&cntapp=Simple%20Login&cntpkg=com.couchbase.SimpleLogin<\/p>\n\n\n\n
On the page above, click the Choose and configure services<\/strong> button and you\u2019ll be taken to a new page where you can enable Google Sign-In<\/strong>. From there, click Generate configuration files<\/strong> and download the new plist file.<\/p>\n\n\n\nImport GoogleServer-Info.plist<\/strong> to your Xcode project:<\/p>\n\n\n\n![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/xcode-import-plist.png\")
<\/p>\n\n\n\n
Adding URL schemes to your project<\/h3>\n\n\n\n
Google Sign-In requires two custom URL Schemes to be added to your project. To add the custom schemes:<\/p>\n\n\n\n
\n- Open your project configuration: double-click the project name in the left tree view. Select your app from the TARGETS<\/strong> section, then select the Info<\/strong> tab, and expand the URL Types<\/strong> section.<\/li>\n\n\n
- Click the +<\/strong> button, and add a URL scheme for your reversed client ID. To find this value, open the
GoogleService-Info.plist<\/code> configuration file, and look for the REVERSED_CLIENT_ID<\/code> key. Copy the value of that key, and paste it into the URL Schemes<\/strong> box on the configuration page. Leave the other fields blank.<\/li>\n\n\n- Click the +<\/strong> button, and add a second URL scheme. This one is the same as your app\u2019s bundle ID. In this case, it should be com.couchbase.SimpleLogin<\/strong>.<\/li>\n\n<\/ol>\n\n\n\n
When completed, your config should look something similar to the following (but with your application-specific values):<\/p>\n\n\n\n
![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/xcode-url-types.png\")
<\/p>\n\n\n\n
Integrating Google Sign-In into your iOS app<\/h3>\n\n\n\n
Now your project is configured correctly you can start using the SDK to add the Login button on the UI and app logic to retrieve the user info. In AppDelegate.swift<\/strong>, declare that this class implements the GIDSignInDelegate<\/code> and add the following in the application:didFinishLaunchingWithOptions:<\/code> method:<\/p>\n\n\n[crayon lang=”swift”]func application(application: UIApplication,
\n didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
\n \/\/ Initialize sign-in
\n var configureError: NSError?
\n GGLContext.sharedInstance().configureWithError(&configureError)
\n assert(configureError == nil, “Error configuring Google services: (configureError)”)<\/p>\n
GIDSignIn.sharedInstance().delegate = self<\/p>\n
return true
\n}[\/crayon]<\/p>\n\n\n\n
Next, implement the application:openURL:<\/code> method of your app delegate. The method should call the handleURL<\/code> method of the GIDSignIn<\/code> instance, which will properly handle the URL that your application receives at the end of the authentication process:<\/p>\n\n\n[crayon lang=”swift”]func application(application: UIApplication,
\n openURL url: NSURL, sourceApplication: String?, annotation: AnyObject?) -> Bool {
\n return GIDSignIn.sharedInstance().handleURL(url,
\n sourceApplication: sourceApplication,
\n annotation: annotation)
\n}[\/crayon]<\/p>\n\n\n\n
In the app delegate, implement the GIDSignInDelegate<\/code> protocol to handle the sign-in process by defining the following methods:<\/p>\n\n\n[crayon lang=”swift”]func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!,
\n withError error: NSError!) {
\n if (error == nil) {
\n \/\/ Perform any operations on signed in user here.
\n let userId = user.userID \/\/ For client-side use only!
\n let idToken = user.authentication.idToken \/\/ Safe to send to the server
\n let name = user.profile.name
\n let email = user.profile.email
\n \/\/ …
\n } else {
\n println(“(error.localizedDescription)”)
\n }
\n}[\/crayon]<\/p>\n\n\n\n
Adding the Sign-In Button<\/h3>\n\n\n\n
Next, you will add the Google Sign-In button so that the user can initiate the sign-in process. In the view controller that manages your app\u2019s sign-in screen, make the class implement the GIDSignInUIDelegate<\/code> protocol.<\/p>\n\n\n\nIn the view controller, override the viewDidLoad method to set the UI delegate of the GIDSignIn object, and (optionally) to sign in silently when possible.<\/p>\n\n\n
[crayon lang=”swift”]override func viewDidLoad() {
\n super.viewDidLoad()<\/p>\n
GIDSignIn.sharedInstance().uiDelegate = self<\/p>\n
\/\/ Uncomment to automatically sign in the user.
\n \/\/GIDSignIn.sharedInstance().signInSilently()<\/p>\n
\/\/ TODO(developer) Configure the sign-in button look\/feel
\n \/\/ …
\n}[\/crayon]<\/p>\n\n\n\n
Implement the GIDSignInUIDelegate<\/code> protocol:<\/p>\n\n\n[crayon lang=”swift”]\/\/ Implement these methods only if the GIDSignInUIDelegate is not a subclass of
\n\/\/ UIViewController.<\/p>\n
\/\/ Stop the UIActivityIndicatorView animation that was started when the user
\n\/\/ pressed the Sign In button
\nfunc signInWillDispatch(signIn: GIDSignIn!, error: NSError!) {
\n myActivityIndicator.stopAnimating()
\n}<\/p>\n
\/\/ Present a view that prompts the user to sign in with Google
\nfunc signIn(signIn: GIDSignIn!,
\n presentViewController viewController: UIViewController!) {
\n self.presentViewController(viewController, animated: true, completion: nil)
\n}<\/p>\n
\/\/ Dismiss the “Sign in with Google” view
\nfunc signIn(signIn: GIDSignIn!,
\n dismissViewController viewController: UIViewController!) {
\n self.dismissViewControllerAnimated(true, completion: nil)
\n}[\/crayon]<\/p>\n\n\n\n
Add a GIDSignInButton<\/code> to your storyboard, XIB file, or instantiate it programmatically. To add the button to your storyboard or XIB file, add a View and set its custom class to GIDSignInButton<\/code>.<\/p>\n\n\n\nRun the app and you should now see the Google styled button and be able to login:<\/p>\n\n\n\n
![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/run-signin-button.png\")
<\/p>\n\n\n\n
Creating a Session with Sync Gateway<\/h3>\n\n\n\n
In AppDelegate.swift<\/strong>, find the signIndidSignInForUserwithError<\/code> method and add the following below the existing code:<\/p>\n\n\n[crayon lang=”swift”]\/\/ 1
\nlet loginURL = NSURL(string: “https:\/\/localhost:8000\/google_signin”)!<\/p>\n
\/\/ 2
\nlet session = NSURLSession.sharedSession()
\nlet request = NSMutableURLRequest(URL: loginURL)
\nrequest.addValue(“application\/json”, forHTTPHeaderField: “Content-Type”)
\nrequest.HTTPMethod = “POST”<\/p>\n
\/\/ 3
\nvar properties = [
\n “user_id”: userId,
\n “auth_provider”: “google”
\n]
\nlet data = try! NSJSONSerialization.dataWithJSONObject(properties, options: NSJSONWritingOptions.PrettyPrinted)<\/p>\n
\/\/ 4
\nlet uploadTask = session.uploadTaskWithRequest(request, fromData: data, completionHandler: { (data, response, error) -> Void in
\n \/\/ 5
\n let json = try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments) as! Dictionary
\n print(“(json)”)<\/p>\n \/\/ TODO: pull\/push replications with authenticated user<\/p>\n
})
\nuploadTask.resume()[\/crayon]<\/p>\n\n\n\n
Here\u2019s what is happening above:<\/p>\n\n\n\n
\n- The login URL on the App Server running locally.<\/li>\n\n\n
- Create a request instance.<\/li>\n\n\n
- Serialize the properties containing the Google userID as JSON to be sent in the request.<\/li>\n\n\n
- Send POST request.<\/li>\n\n\n
- Response object containing Sync Gateway Session credentials<\/li>\n\n<\/ol>\n\n\n\n
NOTE:<\/strong> Before running the application, be sure the disable App Transport security since the App Server isn\u2019t using HTTPS. Open Info.plist<\/strong> and add the following:<\/p>\n\n\n[crayon lang=”xml”]NSAppTransportSecurity<\/p>\n
NSAllowsArbitraryLoads
\n[\/crayon]<\/p>\n\n\n\n
Build and run. Notice the response from the App Server in the Xcode debugger:<\/p>\n\n\n\n
![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/run-logs.png\")
<\/p>\n\n\n\n
Finally, you will add the Couchbase code to start a pull replication with the session details. In AppDelegate.m<\/strong>, add the method startReplications<\/code>:<\/p>\n\n\n[crayon lang=”swift”]func startReplications(sessionInfo: Dictionary) {
\n \/\/ 1
\n let dateString = sessionInfo[“expires”]!
\n let dateFormatter = NSDateFormatter()
\n dateFormatter.dateFormat = “yyyy-MM-dd’T’HH:mm:ss.SSSZ”
\n let date = dateFormatter.dateFromString(dateString)!<\/p>\n \/\/ 2
\n let manager = CBLManager.sharedInstance();
\n let database = try! manager.databaseNamed(“simple-login”)<\/p>\n
\/\/ 3
\n let syncGatewayURL = NSURL(string: “https:\/\/localhost:8000\/simple-login”)!
\n let pull = database.createPullReplication(syncGatewayURL)
\n pull?.continuous = true<\/p>\n
\/\/ 4
\n pull?.setCookieNamed(sessionInfo[“cookie_name”]!, withValue: sessionInfo[“session_id”]!, path: “\/”, expirationDate: date, secure: false)
\n pull?.start()
\n}[\/crayon]<\/p>\n\n\n\n
Call this method in the callback of the uploadTask you added in the previous step.<\/p>\n\n\n\n
Et voil\u00e0! You now have a pull replication running for the user with name google-{userID}<\/code>. You can test the access is working by adding a document with the following command (replace the Google user ID with that of a user already logged in):<\/p>\n\n\n[crayon lang=”bash”]$ curl -vX POST
\n -H ‘Content-Type: application\/json’
\n https:\/\/localhost:4985\/simple-login\/
\n -d ‘{“_id”: “1234”, “user_id”: “google-102898171485172449137”}'[\/crayon]<\/p>\n\n\n\n
Head over to the Users tab in the Admin UI at https:\/\/localhost:4985\/_admin\/db\/simple-login\/users<\/a> and notice that user google-102898171485172449137<\/code> now has access to channel 1234<\/code>:<\/p>\n\n\n\n![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/final-test.png\")
<\/p>\n\n\n\n
Where to Go From Here<\/h2>\n\n\n\n
Congratulations! You learnt how to use Google SignIn with Couchbase Mobile to create a delightful experience and synchronize documents per the user ID of the logged in user.<\/p>\n\n\n\n
Feel free to share your feedback, findings or ask any questions in the comments below or in the forums. Talk to you soon!<\/p>\n","protected":false},"excerpt":{"rendered":"
Using OAuth APIs provided by 3rd party applications such as Google+ to login in your mobile app can provide a delightful first time experience to users. They can login with an account that they already know and trust and populate their profile with data that they entered on Google+. In this tutorial, you\u2019ll learn how […]<\/p>\n","protected":false},"author":51,"featured_media":18,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[9],"tags":[],"ppma_author":[115],"class_list":["post-344","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-couchbase-mobile"],"yoast_head":"\n
Google SignIn with Node.js to a Couchbase Mobile Application<\/title>\n<meta name=\"description\" content=\"Learn how to use Google SignIn with Couchbase Mobile to create a delightful experience and synchronize documents per the user ID of the logged in user.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/es\/adding-google-sign-in-with-node-js-to-a-couchbase-mobile-application\/\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Adding Google Sign-In with Node.js to a Couchbase Mobile application\" \/>\n<meta property=\"og:description\" content=\"Learn how to use Google SignIn with Couchbase Mobile to create a delightful experience and synchronize documents per the user ID of the logged in user.\" \/>\n<meta property=\"og:url\" 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