Twitter authentication for Flutter Web - flutter

I've been struggling finding a way to make my web app obtaining token + secret from Twitter.
All packages for twitter login doesn't support web atm and I don't want to use Firebase.
Is there any way to achieve Twitter login for web without Firebase? And if so, how does it work?
Regards.

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Spotify Web API authorization/log in in swift

I am trying to authorize a user for my app so I can display their Spotify data. I have read plenty of tutorials and tried to understand peoples implementation of this but I cannot get it to work. Does anyone know how to setup this login screen and connect to the Spotify Web API.

Google Login in Ionic 4

Is there a way to implement Google Login without Firebase?
I just want to get a valid token to pass it to the Server, to use my own strategy, but I don't want to be dependet on Firebase. But I only find Google Login tutorials using Firebase.

Logging in a social media (facebook, twitter etc) in a hybrid mobile application through javascript

My hybrid mobile application (for android and iOS possibly windows as well) requires users to authenticate in Facebook.
How should I setup the Facebook application (mobile application or web application) since I am using Javascript SDK
If I need to setup the application as a web app, How should I configure the app domain and site URLs in Facebook application as the files are going to reside in the local app folders of the hybrid mobile application.
If I need to setup the application as a mobile app, How can I use the Javascript SDK?
The OAuth Login system verfication helps to increase the registration , since your application is hybrid and its a mobile based you need to create a php based web login auth to authenticate the login , there are many an enumeros website that help in aiding to achive the determined goal of this, the first thing is to create a facebook application , secondly you need to configure App Id and App Secret ( this will require you to input details about your domains and other information related to the app infos ) , your solution can be found here www.oauthlogin.com also check this out simply download and implement video instruction out there http://www.9lessons.info/2011/09/update-login-with-facebook-and-twitter.html
You will need to register your app with facebook to get developers API Apps Id and App Secret.
you have to follow a screenshot of Friends Invite from Facebook in the links below.
http://www.webtuts.info/webdevelopment/facebook-api-invite-friends-website/172/
The set up are all the same and that is what am using in my phonegap app to set facebook login authentication. Once you have created an account with facebook, you can follow a tutorial in the link below to build your facebook login for IOS,Windows and Android etc
http://asif18.com/5/facebook/facebook-login-using-php-sdk-and-javascript-sdk/
You can write back if you find it difficult to integrate. Rate this response if you findin it helpful. Thanks

Rails/iPhone: recommended place of doing OAuth

I'm building a (Rails-based) web service with a mobile app (iPhone) as frontend. In order to allow people to login using Facebook, I've built something using devise and omniauth that allows the user to log in using Facebook and store the credentials in the database. This works perfectly, all from the web app.
However, now the second part: I want to let users log in via the mobile app. Of course, there are the FB Connect libraries, but they give the mobile app access to the Graph API. Instead, I would like a mobile log-in screen that authorizes Rails to access the data. This is because later on, users might use both the iPhone app and web app.
What would be the recommended way of doing this? Are there any best practices?
I solved it by doing the authorization using FB Connect and the FB app. After authorizing, the FB app opens my app again, and I can read out the access token. Which I can then send to the server and use there.

How do I authenticate a Google user on the iPhone using GData?

I am new in iphone application. I want to make a simple application in which User can login from google and facebook. I have integrate API's for both of them. I have also completed the facebook connection but I dont know how to validate the Google user with its API (Gdata).
Can anybody please help me for authentication of google account using iphone application.I just want to check wether user is valid google user or not that's it. Please help me for that.
Thanks in advance..
Google supports OpenID, though that is typically just used by websites.
There is also authentication for Google accounts called ClientLogin; the Objective-C GData library provides routines to authenticate via ClientLogin to a Google account for use with a specific Google service API.
What is it that your application will do for authenticated users that it would not do for unauthenticated users?