[Story] Banner for unverified user identity change

[manuroe]

Description

• As a user
• I want to be informed when an unverified user has changed their identity keys
• So that I can make a conscious decision before posting a message in a room

We are to implement the temporary flow version from figma. The Final version will happen with invisible crypto.

Acceptance criteria

• The banner is displayed close to the composer and does not affect the timeline interactions (srolling, URL navigation)
• It is displayed when the user opens the room
• It stays until the user tapped ok
• It pops up in realtime once SDK/Crypto detects the change
• It is displayed once per identity change. SDK/Crypto stores the user acknownledgment
• A single identity change is shown at a time as a "FIFO". If the user acknowledges one and it there are more, the app must display the banner for the next unverified user identity change
• Tech one: the banner component should be reusable. We are going to use it with invisible crypto on such screen

API

The API is being implemented in #2526 - see branch https://github.com/matrix-org/matrix-rust-sdk/tree/andybalaam/room-identity-stream until it is merged.

Summary:

Call this method in matrix_sdk_ffi::room::Room:

    pub fn subscribe_to_identity_status_changes(
        &self,
        listener: Box<dyn IdentityStatusChangeListener>,
    ) -> Arc<TaskHandle>

Passing in one of these:

pub trait IdentityStatusChangeListener: Sync + Send {
    fn call(&self, identity_status_change: Vec<IdentityStatusChange>);
}

Size estimate

None

Dependencies

• None

Out of scope

• Nothing

Open questions

Questions

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Subtasks

Android

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1. Invisible Crypto: EX Android: display a warning when an *unverified* user changes identity #2524
   +0
   

iOS

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1. Invisible Crypto: EX iOS: display a warning when an *unverified* user changes identity #2525
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Rust

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1. Invisible Crypto: Rust for EX: display a warning when an *unverified* user changes identity #2526
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Other

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1. URL for the "Learn more" link: https://element.io/help#encryption18

[richvdh]

I think this is a duplicate of #2492 ?

[andybalaam]

I think this is a duplicate of #2492 ?

No, 2492 is about verified and this is about unverified identities.

[richvdh]

No, 2492 is about verified and this is about unverified identities.

Argh, yes, sorry.

[richvdh]

Useful links:

• Part of Invisible crypto: inform users about changes to other users' cryptographic identity #2491
• Element-Web equivalent: Invisible Crypto: Web: display a warning when an *unverified* user changes identity #2513

[manuroe]

Checked with @BillCarsonFr . We can close this task.