Login webflow v3 to support simple signup and global scale

[AndyScherzinger]

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Is your feature request related to a problem? Please describe.
As briefly discussed with @skjnldsv using login flow v2 is not possible, as the Desktop client does not know to which provider it should connect.

Describe the solution you'd like
So we need a "v3" with a gateway

• Desktop starts simple sign up in browser with generated token
  • pings nc.com/signup for continuous monitoring (same like v2)
• User chooses provider on web site, creates account, etc.
• after successful creation of the account the desired provider send nc:// info to Desktop via /signup (identified via token)

Additionally this needs to be backported to at 23/22/21 since else Apple M1 clients will need to rely on latest server version or 23+ which will likely cause issues in support at some point.

Motivation:

• QT for Apple M1 currently does not support QT WebEngine
• there might be proxy settings where it is better to use standard browser for this signup/login
• getting rid of v1 code on Desktop, as it is only used for preferred providers

Describe alternatives you've considered
none.

Additional context
First step is for the files-team to align the API with the clients-team or Tobias and Desktop-dev(s) respectively

[szaimen]

I don't want to intercept here but wouldn't it make more sense to wait for the QT WebEngine to become available for M1 Macs or will that not be available in the foreseen future?

[tobiasKaminsky]

This is no longer only about Desktop, but also will become relevant for other clients, as e.g. v1 starts making trouble on Android nowadays.

[marinofaggiana]

This is no longer only about Desktop, but also will become relevant for other clients, as e.g. v1 starts making trouble on Android nowadays.

Confirm, v1 demonstrates too many problems and limitations, in iOS then with the new limitations for cookies (from different domains) ...

[mickenordin]

I would love to see a webflow v3 land in nextcloud desktop and mobile apps. The fact that mac clients and browser works differently from windows/linux clients is a real head ache. I recently wrote an app that adds back MFA for SSO accounts, and it works nicely in the web and on the desktop client when build with login flow v2 (default on mac, possible at build time on linux/windows), but not on android and the desktop with the webview.