I would like to use Oauth 2 for an application in Google App Engine with Java, but I dont find any good example of that use, I would be very thankful if somebody could help me please, it is something frustrating dont find good examples, thnak you.
My 2c is avoid oauth2 libraries. Of course opinions may vary, but for me they provide very leaky abstractions, so you end up being dragged into understanding oauth by the back door. For me at least, taking an hour to read the the two pages that tell you all you need to know, and carefully avoiding all the others, will get you where you want to be.
In simple terms, the steps are :-
Call the auth URL with your app/client ID and the scopes you require. Include the "email" scope.
Google will walk the user through login, and (if the first time through) authorisation dialogues
Eventually the browser will redirect back to your oauthcallback url, and pass you an auth code
Call google to convert the auth code to a refresh token. This will also return the user's google ID and an access token.
Store the user ID in your session so you can identify the user subsequently
Persist the refresh token alongside the google user id in a database
On subsequent visits...
If you have the google user id in the your session, you can retrieve the refresh token from your database and use it to generate access tokens as you need them.
If you do NOT have the google user id in your session, go through the steps above. This time, google will NOT prompt the user for authorisation (since it's already authorised), and the refresh token will be blank (since you already have one stored).
Everything you need to know is within the oauth playground page. If you click through the buttons, you will see that it is following the steps I outlined above.
You then need to deal with the possible error situations, eg
user declines permission
user withdraws permission
google expired the refresh token (happens a lot) so you need to re-auth
timeouts
The two pages you need to read are :-
https://developers.google.com/accounts/docs/OAuth2WebServer and the oauth playground at https://developers.google.com/oauthplayground/
Trust me, as long as you know how to form a URL, store a refresh token (it's just a string) and parse a JSON response, then everything you need is on those pages. Except ...
all the documentation skips over the need to preserve the user ID in your session so you know who it is that is accessing your app. If you're on AppEngine, you may be confused by the appengine sample code which uses a separate appengine login. Ignore it. You will be using oauth to authenticate the user so the appengine stuff doesn't apply and is somewhat confusing.
It's actually much simpler than some of the documentation would lead you to believe, and like I said, imho the leaky libraries don't help.
I'm trying to do exactly the same thing and I agree - it is extremely hard to find a good example of this.
I did find this youtube video however and I think it would help: https://www.youtube.com/watch?v=tVIIgcIqoPw.
Its from Google and it is called Getting Started with Google APIs. The last segment of the video deals with authentication.
There are several OAuth 2 client and server libraries for Java listed on this page: http://oauth.net/2/
Here's quick-start documentation for using Apache Otlu: https://cwiki.apache.org/confluence/display/OLTU/OAuth+2.0+Client+Quickstart
If you're accessing a Google API (as a client), you can use the Google client library for Java, which does OAuth as well as API set-up: https://code.google.com/p/google-api-java-client/
Related
I have a React Application which is going to leverage Google My Business API to get review data of a business.
I was expecting to use the API-KEY via REST approach however Authorization Scope mentions that OAuth 2.0 is required to use this API.
After I read more about OAuth's purpose, it seemed like it is more for application's which require access to a user's data and therefore would required a consent screen verified by google.
For my use-case however, all I need is access to all google reviews for a business and nothing related to the visiting users.
Can someone recommend an approach for this? (I don't want a pop-up/consent request when a user visits as I don't need user data.)
After much research, it seems that if you want to retrieve ALL REVIEWS for your business you will have to use Google's My Business API. This API requires you to use OAUTH2 for authentication which means (although you will not be querying a visiting user's data) visiting users will be required to provide consent pop up screen.
This leaves you with the places API as the next best option:
REST GET endpoint maps.googleapis.com/maps/api/place/details/json?placeid={your place ID}&fields=review&key={YOUR API KEY}
Although this only returns google's top 5 "most helpful" reviews, its pretty much the only way to get reviews without a consent screen unless you want to scrape data which is not ideal for many reasons...
This sounds like a popular scenario, but I can't find direct answer nowhere...
I want to plot Analytics data in my app's admin area.
This area is used by multiple users of the company, and they have to authenticate to access this area. I plan to use GA service account, but 'browser-key/domain' option seems only available for public api.
Can I use server auth (through node API), get the token, and pass it to user while logging in? Will the token be valid? Can I have multiple valid tokens simultaneously for all the users?
Or maybe there is some other way to do it?
Okay, I've tested it myself and the answer is:
YES, you get universal (max 60min) token with every request - so you can have many of them, and dispose to you client-side apps as needed.
I have now embedApi widget in my Angular.js dashboard for every user, without login.
Add me to the list of people confused by all this: https://developers.google.com/accounts/docs/OpenID#openid-connect. I currently use the Python Users API in an AppEngine application running at https://www.stackmonkey.com/. I build the login URL for my login button like this:
login_url = users.create_login_url(federated_identity='gmail.com', dest_url=dest_url)
self.redirect(login_url)
The Users API manages my user DB for me. I'm able to pull the current user's session with this code:
current_user = users.get_current_user()
Given the complete lack of information on the topic anywhere I've looked on Google's pages, I'm wondering if anyone has any information on whether the Users API can be made to work with the suggested migrations, or if Google is going to update the Users API to support the new authentication methods they suggest?
At least I have some time on this, but I'm really not looking forward to reimplementing an entire auth system in my app.
Small update, I've tried creating a sample application running at kordtest2.appspot.com which is returning a 400:
Error: Bad Request
Your client has issued a malformed or illegal request.
The code used for that sample app is cut and pasted from the Python getting started guide on their site (I can't post another link with this account).
I had the same problem, and it appears to be when I was logged into multiple GMAIL/GOOGLE accounts at the same time. When I logged out of all of them except one, that one worked fine with my code, based on the sample Python code.
I've got AngularJS and Web.API WAAD authentication up and running. For client side I use great library ADAL.JS. For backend I use Microsoft.Owin.Security.OAuth. This part went quite smooth.
Now I want to implement authorization based on roles (which will be mapped to WAAD groups). Groups are not included in authentication token so I must ask Azure Graph API for them. I saw various ways to do it, using custom claims providers, adding web services to project, etc. Some examples already providing mapping between groups and roles to use in [Authorize] attribute.
But what is just the simplest example of how to get a list of group ids/names from WAAD providing User ID or username, when I'm already authenticated?
Also, is there any way to get this data in JS to use in Angular frontend, or should I create an API service which Angular should call for roles info?
In the non-JS case, the simplest way of getting groups in the token is by opting in. Download your application’s manifest, locate the “groupMembershipClaims” entry, change its value to “SecurityGroup” or “All”, upload back the manifest.
However note that this won't work for your scenario, because it uses the implicit grant - here the token is returned in an URI fragment, hence a big token would risk blowing past the URL length limits of the browser.
You can always request groups to the Graph and make it available to your frontend via custom action on your API, but from what you wrote you are already familiar with that. Let me discuss the matter here - if there's a simpler route to make this work in SPAs, I'll get back to this thread.
HTH
V.
Update: I verified and in the implicit grant case you will receive groups always via the overage claim. Please refer to https://github.com/AzureADSamples/WebApp-GroupClaims-DotNet/tree/master/WebApp-GroupClaims-DotNet - it will show you how to process the overage claim to retrieve groups. All you need to do is apply the same guidance to a web API instead, and if you need to make the info available to the client expose one or more actions doing so.
I am writing an travel itinerary app engine application which will interact with the calendars of my users. In order to manage access to my user's calendar I intend to use OAuth 2.0. I looked online for various code examples and the closest to what I am trying to acheive is (http://code.google.com/p/google-api-java-client/source/browse/calendar-appengine-sample/src/main/java/com/google/api/services/samples/calendar/appengine/server/?repo=samples). I have the following questions
1) I find that the server needs access to the application's client id and client secrets. Most of the sample code I have seen so far loads this from a local file. Does AppEngine give some API which will enable me to retrieve the client id and client secret without me having to worry about storing it ?
2) If I have to store the client secret in a secure fashion what are my options ?
3) What is the best way to store a user's access token and refresh token ?
It almost never changes, so hardcode it. It's only really loaded from a file in the sample programs so that you can get the samples running without touching the code.
See 1.
You can use the Google provided Credential class which uses a dedicated kind. Or, given that they are simply strings, you can store them as part of the User kind which your app almost certainly has to track your registered users.
As a tip, separate writing your oauth code from writing your calendar code. I would start by writing an app that only authorises, stores the refresh token, and refreshes the access token. You can test your access token using curl. Once you have that all working, then add your Calendar functionality as phase 2.