/rooms/{roomId}/initialSync support

[henri2h]

Preflight Checklist

• I could not find a solution in the existing issues, docs, nor discussions

Describe your problem

Despite being deprecated, /rooms/{roomId}/initialSync is needed to support peeking into rooms for guest accounts.

Would you be interested in adding support for it?

Describe your ideal solution

In order to add support, one need to create

• a new endpoint function in the MatrixApi.
• two new models to parse the API response (InitialSyncUpdate and PaginationChunk

I created both of them in an extension

This enables adding support for room peeking.

I created a peeking extension, which could be added in matrix_dart_sdk.

The membership is set to Membership.leave to prevent storing the peeked events into the database.

Version

No response

Security requirements

No response

Additional Context

No response

[krille-chan]

We can just add it manually to this class: https://github.com/famedly/dart_matrix_api_lite/blob/main/lib/src/matrix_api.dart should not produce any problems I think. We should consider marking it as Deprecated() in dart until the mentioned issue is clarifyied. However currently there is no priority for us to do this. Would you implement this?

[henri2h]

Okay! Will do a MR when I'll have some time!