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5d080bdbec
This patch encrypts the `EventId` value in the `events` and `event_chunks` tables for the Event Cache database. The `EventId` is transformed as a `String`, and encoded as is. This patch also adds `Encryption::encode_event_id` and `Encryption::encode_room_id` to centralise these operations. The _table name_ for the room ID encoding changes from `keys::LINKED_CHUNKS` to `keys::EVENTS`. This is not a big change but since we are erasing all the data for the Event Cache database, we can do this small change. The biggest change is in `filter_duplicated_events` where we can no longer use the `event_id` value from the `SELECT` as the returned value because it is encrypted and cannot be decrypted. To achieve that, we use the data provided as the parameter of the method to _map_ the encoded value the other way. Before, the algorithm was: - `Vec<EventId>` were the event we want to find duplicates, - run the SQL query selecting all events matching the `event_id`s, - returning the `event_id` from the SQL query And now, the algorithm is: - `Vec<EventId>` were the event we want to find duplicates, - transform it to `Vec<(EventId, Key)>` where `Key` is the encoded event ID, - run the SQl query selecting all events matching the encoded flavour of the `event_id`s, - when found, the SQL query returns the encoded flavour, so we look back in `Vec<(EventId, Key)>` to find the `EventId` from the `Key`.