Develop Reference

Google Analytics Sign In with user and password

I'm developing an app in java/sacala to provide to differents clients use their google analytics info. But the only way I found to connect to get the info is using .p12 certificate or client_secret.json.
Is it possible to connect just with user and password like a regular login in google. (maybe with the regular login you can get the .p12 or the json without enter to analytics console)
Because I saw in some apps like tableau this feature but I didn´t find documentation about that in google.
Thanks

Follow the steps in the Java Install Application Hello World example. When the user runs your application they will be prompted to sign in and authorize your application to access their data.
It also helps to take a look at the the OAuth scenarios.
If you are trying to hard code the username and password into an application, this will not work for obvious security reasons. If that is your intent you should use a service account.

Authenticate mobile application with WeChat

I have an app that provides initial login (authentication) with facebook or twitter.
I would like to add WeChat authentication.
App isn't on the stores yet.
Does anyone have any experience on this kind of authentication?
What are the steps to achieve it?
I'm so confused by wechat documentation because seems have two versions:
one used to send messages;
another one, seems, that grants authenticated API (chinese documentation only?);
I think that a guide on SO is missing and can help a lot of people considering that documentation is not too clear.
Problem is that I cannot register my app:
if I use 'developers.wechat.com' I can't create app because of this bug.
if I use 'https://open.weixin.qq.com/' I can't create my account because a chinese phone number is required.
So?

Using google oAuth2 to collect gmail email from java app

I have a web base email client that uses a java app to connect to IMAP and POP3 servers to download email. There is an issue that if a user usually logs in form the US that the java app will not have access to collect emails until that user logs in from the same county the java app is running.
I was told to overcome this to use google oAuth in order for the account user to give permission to my app to collect emails. Is this correct? Once this has been accomplished I would also like to the the API to import contacts, but for now authorization/authentication is sufficient.
The problem I am facing is that after trying to make heads a or tails of the google oAuth api documentation im really confused and did not yet manage to make a working example. Documentation often has links to a depreciated API and there is no example with a dowload link to both the API needed and exaple source code, as a result I think im using incorrect libraries for my examples.
Its also not clear to me what/how to accomplish what is needed do I use client authentication via javascript to create a popup whereby the user grants access?
Or do I use installed app client with a token and secret, this is what I tried but the 'command line' example I tried requires Java EE and this is a native app so I dont see why and I dont want to import all Java EE libraries to my small email downloader app.
Where can I find more intuitive documentation and working examples on this?

If you stay away from OpenID 2 and OAuth 1, I think the docs are pretty orderly these days. The best place to start is https://developers.google.com/accounts/docs/OAuth2

Facebook user authentication in java

I am able to load my app in facebook iframe, but can anyone help me with the user authentication in java. Any help will be really appreciated. Thanks

All java API clients provide extensive documentation on authentication. Here are two:
restfb
spring-social-facebook
Authentication follows the OAuth dance, which includes exchanging tokens. A tricky bit is that you should store the initial request token in your session, in order to be able to get it when facebook redirects the user back afterwards.

You can use a sdk like this one or you can find your way trough the facebook api, the requests are simple.

Verifying Twitter OAuth on BlackBerry

Hey all, i want to integrate my Blackberry App with Twitter, and found that the way to do it is with OAuth. The problem I have is that i would like to do the verification of this from my server as to put less strain on the device, but I have no idea how to get the OAuth PIN from the server to be displayed on the device so the user can enter it, any ideas as to how i can do this? or an alternative ?

You can't. OAuth was designed such that only the service provider can provide authentication (so that the developers don't have to store their client passwords on their database servers and if the client changes their passwords, then it would have to be managed also on the developers side too). There is only one source of authentication and that's from the service provider (Twitter, in this case). Sharing of passwords is therefore eliminated.
OAuth doesn't work on PINs but rather using Request/Access Token. Follow the Beginners' Guide to OAuth and Twitter Developer's Auth Page to see how you can incorporate OAuth to Twitter. Just to give you an heads up, you will have to register your application to Twitter.
Update For Mobile and Desktop applications, rather go through Twitter's xAuth. Here's a documentation on how to register and use your application to use xAuth.
Twitter OAuth FAQ.