Add support for captive portals to mattermost-mobile [Open Source]

My company uses a captive portal, Google IAP (Identity aware proxy) to protect its mattermost installation

This means i can't use the mattermost mobile app on Android. As part of its startup it asks you to enter a server name, which it then 'pings' (calls /ping). With my captive portal this ping gets redirected (302) to a login page.

Current behaviour: The redirect of ping makes it say "cannot connect to the server. Please check your server URL and internet connection"

My desired behaviour (this job!): Alter the client's code so that it pops up a browser window, following the redirect. When the user logs in the cookies that get set need to be persisted in the application and send with **all future HTTP requests for that server**

The mattermost desktop client (v4.1.3 - yes it's an old one) seems to do this, i've had some problems with later versions of the desktop client supporting this as well.

So i think this work consists of:

- Handle redirected /ping to handle the login flow

- Persist cookies from the end of the login flow to the app for the whole session

- When reauthentication is necessary (a request encounters a 302 again) do the same thing you did for /ping

- Doing it in a way that means the merge request gets accepted on to the appropriate mattermost project

As a suggestion, perhaps it's a matter of catching 302s globally and popping them up in a browser?

I am a (busy) developer and can review your code, but the main thing is that this gets merged into the mattermost project.

Acceptance criteria:

- I can enter my company's chat server in the server box (I will reveal this to the winning bidder)

- I can login with the Google IAP protecting it (unfortunately i can't give you a working login to this, if it's a massive blocker we can maybe setup a sample IAP on GCP)

- I can use it for the session and login again when my session expires

- The PR is accepted to the mattermost-mobile project (i.e. meets their standards)

Skills: Mobile App Development, Javascript, Android, Open Source

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Project ID: #24070597

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