request<\/a> module to proxy all other traffic to Sync Gateway.<\/p>\nInstall the following Node.js modules:<\/p>\n
$ npm install express body-parser request --save<\/code><\/pre>\nCreate a new file called server.js<\/strong> and add the following:<\/p>\n\/\/ 1\r\nvar express = require('express')\r\n , bodyParser = require('body-parser')\r\n , request = request('request').defaults({json: true});\r\n\r\n\/\/ 2\r\nvar app = express();\r\napp.use('\/google_signin', bodyParser.json());\r\n\r\napp.post('\/google_signin', function (req, res) {\r\n \/\/ TODO: handle login request\r\n});\r\n\r\n\/\/ 3\r\napp.all('*', function (req, res) {\r\n var url = 'https:\/\/0.0.0.0:4984' + req.url;\r\n req.pipe(request(url)).pipe(res);\r\n});\r\n\r\n\/\/ 4\r\nvar server = app.listen(8000, function () {\r\n var host = server.address().address;\r\n var port = server.address().port;\r\n\r\n console.log('App listening at https:\/\/%s:%s', host, port);\r\n});<\/code><\/pre>\nHere are the different things happening:<\/p>\n
\n- Require the Node.js module you installed previously.<\/li>\n
- Instantiate a new instance of express and use the bodyParser<\/strong> middleware only for the \/google_signin<\/strong> endpoint.<\/li>\n
- Proxy all other requests to Sync Gateway.<\/li>\n
- Start the Node.js web server on port 8000.<\/li>\n<\/ol>\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![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/server-root.png\")
<\/p>\n
From Google SignIn to Sync Gateway Sessions<\/h3>\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
![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/google-sign-in.png\")
<\/p>\n
A few things are happening on this diagram:<\/p>\n
\n- Black<\/strong> sends the Google user ID to the App Server.<\/li>\n
- Blue<\/strong> checks if a user exists in Sync Gateway with that user ID.<\/li>\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
- 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<\/ul>\n
In the \/google_signin<\/strong> handler, add the following:<\/p>\n\/** URL of the Sync Gateway instance running locally *\/\r\nvar stringURL = 'https:\/\/0.0.0.0:4985\/simple-login';\r\n\r\n\/** Given the name of a user that exists in Sync Gateway, create a new session *\/\r\nvar sessionRequest = function (name, callback) {\r\nreturn request({\r\n method: 'POST',\r\n url: stringURL + '\/_session',\r\n json: true,\r\n body: {\r\n name: name\r\n }\r\n}, callback);\r\n};\r\n\r\nvar json = req.body;\r\nvar name = json.auth_provider + '-' + json.user_id.toString();\r\nrequest\r\n\/** Check if the user already exists *\/\r\n.get(stringURL + '\/_user\/' + name)\r\n.on('response', function (userExistsResponse) {\r\n if (userExistsResponse.statusCode === 404) {\r\n \/** If the user doesn't exist, create one with the Google user ID as the name *\/\r\n return request\r\n .put({\r\n url: stringURL + '\/_user\/' + name,\r\n json: true,\r\n body: {\r\n name: name,\r\n password: Math.random.toString(36).substr(2)\r\n }\r\n })\r\n .on('response', function (createUserResponse) {\r\n if (createUserResponse.statusCode === 201) {\r\n \/** If the user was created successfully, create the session *\/\r\n sessionRequest(name, function (sessionError, sessionResponse, body) {\r\n res.send(body);\r\n });\r\n }\r\n });\r\n }\r\n \/** The user already exists, simply create a new session *\/\r\n sessionRequest(name, function (sessionError, sessionResponse, body) {\r\n res.send(body);\r\n });\r\n});<\/code><\/pre>\nRestart the Node.js application and run the following curl request to sign up a new user:<\/p>\n
$ curl -vX POST \r\n -H 'Content-Type: application\/json' \r\n https:\/\/localhost:8000\/google_signin \r\n -d '{\"user_id\": \"123\", \"auth_provider\": \"google\"}'\r\n\r\n\/\/ Response \r\n{\r\n \"session_id\":\"8520c19159a4154abf5fb9b9003ff9677e035929\",\r\n \"expires\":\"2015-10-13T12:48:05.879325313+01:00\",\r\n \"cookie_name\":\"SyncGatewaySession\"\r\n}<\/code><\/pre>\nIn 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
Swift Time: Simple Login Screen for iOS<\/h2>\n
Switch to Xcode and create a new project with the Single View Application<\/strong> template:<\/p>\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
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>\npod 'Google\/SignIn'\r\npod 'couchbase-lite-ios'<\/code><\/pre>\nRun $ 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#import <Google\/SignIn.h>\r\n#import <CouchbaseLite\/CouchbaseLite.h><\/code><\/pre>\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>\nSimpleLogin\/bridging-header.h<\/p>\n
Google Sign-In Configuration file<\/h3>\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
https:\/\/developers.google.com\/mobile\/add?platform=ios&cntapi=signin&cntapp=Simple%20Login&cntpkg=com.couchbase.SimpleLogin<\/p>\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>\nImport GoogleServer-Info.plist<\/strong> to your Xcode project:<\/p>\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
Adding URL schemes to your project<\/h3>\n
Google Sign-In requires two custom URL Schemes to be added to your project. To add the custom schemes:<\/p>\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
- 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- 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<\/ol>\n
When completed, your config should look something similar to the following (but with your application-specific values):<\/p>\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
Integrating Google Sign-In into your iOS app<\/h3>\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>\nfunc application(application: UIApplication,\r\n didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {\r\n \/\/ Initialize sign-in\r\n var configureError: NSError?\r\n GGLContext.sharedInstance().configureWithError(&configureError)\r\n assert(configureError == nil, \"Error configuring Google services: (configureError)\")\r\n\r\n GIDSignIn.sharedInstance().delegate = self\r\n\r\n return true\r\n}<\/code><\/pre>\nNext, 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>\nfunc application(application: UIApplication,\r\n openURL url: NSURL, sourceApplication: String?, annotation: AnyObject?) -> Bool {\r\n return GIDSignIn.sharedInstance().handleURL(url,\r\n sourceApplication: sourceApplication,\r\n annotation: annotation)\r\n}<\/code><\/pre>\nIn the app delegate, implement the GIDSignInDelegate<\/code> protocol to handle the sign-in process by defining the following methods:<\/p>\nfunc signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!,\r\n withError error: NSError!) {\r\n if (error == nil) {\r\n \/\/ Perform any operations on signed in user here.\r\n let userId = user.userID \/\/ For client-side use only!\r\n let idToken = user.authentication.idToken \/\/ Safe to send to the server\r\n let name = user.profile.name\r\n let email = user.profile.email\r\n \/\/ ...\r\n } else {\r\n println(\"(error.localizedDescription)\")\r\n }\r\n}<\/code><\/pre>\nAdding the Sign-In Button<\/h3>\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>\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
override func viewDidLoad() {\r\n super.viewDidLoad()\r\n\r\n GIDSignIn.sharedInstance().uiDelegate = self\r\n\r\n \/\/ Uncomment to automatically sign in the user.\r\n \/\/GIDSignIn.sharedInstance().signInSilently()\r\n\r\n \/\/ TODO(developer) Configure the sign-in button look\/feel\r\n \/\/ ...\r\n}<\/code><\/pre>\nImplement the GIDSignInUIDelegate<\/code> protocol:<\/p>\n\/\/ Implement these methods only if the GIDSignInUIDelegate is not a subclass of\r\n\/\/ UIViewController.\r\n\r\n\/\/ Stop the UIActivityIndicatorView animation that was started when the user\r\n\/\/ pressed the Sign In button\r\nfunc signInWillDispatch(signIn: GIDSignIn!, error: NSError!) {\r\n myActivityIndicator.stopAnimating()\r\n}\r\n\r\n\/\/ Present a view that prompts the user to sign in with Google\r\nfunc signIn(signIn: GIDSignIn!,\r\n presentViewController viewController: UIViewController!) {\r\n self.presentViewController(viewController, animated: true, completion: nil)\r\n}\r\n\r\n\/\/ Dismiss the \"Sign in with Google\" view\r\nfunc signIn(signIn: GIDSignIn!,\r\n dismissViewController viewController: UIViewController!) {\r\n self.dismissViewControllerAnimated(true, completion: nil)\r\n}<\/code><\/pre>\nAdd 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>\nRun the app and you should now see the Google styled button and be able to login:<\/p>\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
Creating a Session with Sync Gateway<\/h3>\n
In AppDelegate.swift<\/strong>, find the signIndidSignInForUserwithError<\/code> method and add the following below the existing code:<\/p>\n\/\/ 1\r\nlet loginURL = NSURL(string: \"https:\/\/localhost:8000\/google_signin\")!\r\n\r\n\/\/ 2\r\nlet session = NSURLSession.sharedSession()\r\nlet request = NSMutableURLRequest(URL: loginURL)\r\nrequest.addValue(\"application\/json\", forHTTPHeaderField: \"Content-Type\")\r\nrequest.HTTPMethod = \"POST\"\r\n\r\n\/\/ 3\r\nvar properties = [\r\n \"user_id\": userId,\r\n \"auth_provider\": \"google\"\r\n]\r\nlet data = try! NSJSONSerialization.dataWithJSONObject(properties, options: NSJSONWritingOptions.PrettyPrinted)\r\n\r\n\/\/ 4\r\nlet uploadTask = session.uploadTaskWithRequest(request, fromData: data, completionHandler: { (data, response, error) -> Void in\r\n \/\/ 5\r\n let json = try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments) as! Dictionary<String, AnyObject>\r\n print(\"(json)\")\r\n \r\n \/\/ TODO: pull\/push replications with authenticated user\r\n \r\n})\r\nuploadTask.resume()<\/code><\/pre>\nHere\u2019s what is happening above:<\/p>\n
\n- The login URL on the App Server running locally.<\/li>\n
- Create a request instance.<\/li>\n
- Serialize the properties containing the Google userID as JSON to be sent in the request.<\/li>\n
- Send POST request.<\/li>\n
- Response object containing Sync Gateway Session credentials<\/li>\n<\/ol>\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>\nNSAppTransportSecurity\r\n\r\nNSAllowsArbitraryLoads\r\n<\/code><\/pre>\nBuild and run. Notice the response from the App Server in the Xcode debugger:<\/p>\n
![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/run-logs.png\")
<\/p>\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>\nfunc startReplications(sessionInfo: Dictionary<String, String>) {\r\n \/\/ 1\r\n let dateString = sessionInfo[\"expires\"]!\r\n let dateFormatter = NSDateFormatter()\r\n dateFormatter.dateFormat = \"yyyy-MM-dd'T'HH:mm:ss.SSSZ\"\r\n let date = dateFormatter.dateFromString(dateString)!\r\n \r\n \/\/ 2\r\n let manager = CBLManager.sharedInstance();\r\n let database = try! manager.databaseNamed(\"simple-login\")\r\n \r\n \/\/ 3\r\n let syncGatewayURL = NSURL(string: \"https:\/\/localhost:8000\/simple-login\")!\r\n let pull = database.createPullReplication(syncGatewayURL)\r\n pull?.continuous = true\r\n \r\n \/\/ 4\r\n pull?.setCookieNamed(sessionInfo[\"cookie_name\"]!, withValue: sessionInfo[\"session_id\"]!, path: \"\/\", expirationDate: date, secure: false)\r\n pull?.start()\r\n}<\/code><\/pre>\nCall this method in the callback of the uploadTask you added in the previous step.<\/p>\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$ curl -vX POST \r\n -H 'Content-Type: application\/json' \r\n https:\/\/localhost:4985\/simple-login\/ \r\n -d '{\"_id\": \"1234\", \"user_id\": \"google-102898171485172449137\"}'<\/code><\/pre>\nHead 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![](\"\/wp-content\/original-assets\/2015\/october\/adding-google-sign-in-with-node.js-to-a-couchbase-mobile-application\/final-test.png\")
<\/p>\n
Where to Go From Here<\/h2>\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
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 […]<\/p>\n","protected":false},"author":51,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1810],"tags":[],"ppma_author":[9028],"class_list":["post-1987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-couchbase-mobile"],"yoast_head":"\n
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