Richard van der Hoff

Indexeddb: support for received room key bundles

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Add a new store to keep track of the information we have received about room key bundles for MSC4268. Fixes: https://github.com/matrix-org/matrix-rust-sdk/issues/5107

We've added a bit more functionality to the sqlite store; need to do the same for indexeddb. Part of https://github.com/element-hq/element-meta/issues/2829

History sharing: On the client, clean up key bundle data when we've used it, or after we think we don't need it

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- [ ] Add a DELETE API to the media store (the uploader is recorded, and it's auth'd, so this seems feasible) - [ ] Allow media uploads to say...

History sharing: check `sender_data` before downloading room key bundles

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Currently, we do not check the cross-signing status for the device that sends us room key bundles. This could mean that we accept a room key bundle even if the...

History sharing: merge megolm sessions if we get keys from two sources

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1. Alice and Charlie share a room 2. Charlie sends a message to a room, sharing the keys with Alice 3. Alice invites Bob to the room, sharing message keys...

If Alice invites Bob to a room, but is unable to claim OTKs or a fallback key for one or more of Bob's devices, she will be unable to share...

Part of https://github.com/element-hq/element-meta/issues/2829

We need to make sure we have as much of the room history as possible, so we need to download all the keys for the relevant room from backup before...

If Bob has forwarded us a megolm session, we need to record that information in the key backup * [ ] Design a change to key backup format * [...

If Bob has forwarded us a megolm session, we'll need to present it as "as presented by Bob" in the UI. The first step is to add this data to...