[Story] EX multi-account: deep-link sign-in resolves to the right account

[mxandreas]

Description

• As a user opening a sign-in deep link that specifies a server/domain (and optionally a username)
• I want to be taken to the right place — my existing account, a fresh sign-in, or the add-account flow — based on whether I'm already signed in
• So that deep-linked sign-in works correctly now that multiple accounts are possible

Acceptance criteria

• Given the deep link includes a username, when the user has no accounts signed in yet, then behavior is unchanged from today.
• Given the deep link includes a username, when the user already has that specific account signed in, then the app opens and switches the active account to that one.
• Given the deep link includes a username, when the user has other accounts but not that specific one, then the user is taken into the "Add account" flow.
• Given the deep link does not include a username, when the user has no accounts signed in yet, then behavior is unchanged from today.
• Given the deep link does not include a username, when the user already has one or more accounts signed in, then the "Add account" flow is triggered with the specified homeserver pre-filled.
• Given the deep link's login_hint doesn't cleanly match a signed-in account (e.g. it's an email address rather than a matrix ID), then proceed as "not logged in to this account" (e.g. into the add-account flow).

Dependencies

• None

Out of scope

• Matching of arbitrary login_hint values (e.g. email addresses) to a specific signed-in account

Questions

• None

Subtasks

Android

iOS

Rust

Other