* If the user has already declined, we don't show that the other
introducee has declined as well. The backend doesn't have that information, so
this is compatible with the principle of showing what we know.
* If the user has already accepted or hasn't yet responded, we show the
decline response in the private conversation with the introducer. If
the user hasn't yet responded, we hide the accept/decline buttons
in the introduction request message.
Messages an introducee receives in a `FINISHED` state are now being
ignored and deleted.
Closes#295
* force decline when two of our own identities are introduced to each
other
* throw away introduction requests to the same identity
(impossible to trigger from UI)
Closes#284
When devices' clocks are out of sync, it is possible that a response is
shown before the request. This commit makes sure that the timestamp of
responses is always later than the last message in the conversation.
Some wording could be misunderstood to thing introductions were
successful even though they were not. That has been clarified.
A new database transaction was created when getting contacts and local
transport properties. This has been changed to re-use the existing
transaction.
Also addresses minor issues found in review.
The code made the assumption that a session state can be identified by
the unique session ID. However, when multiple identities from the same
device are involved, there are two sessions with the same ID running on
the device.
Hence, a second identifying criteria has to be used to uniquely identify
the correct session. Here, the ID of the group was chosen.
Unfortunately, the session state can not be cached easily anymore
leading to a small performance penalty when getting all messages for the
UI.
This Introduction BSP Client uses its own group to communicate with
existing contacts. It uses four types of messages to facilitate
introductions: the introduction, the response, the ack and the abort.
The protocol logic is encapsulated in two protocol engines, one for the
introducer and one for the introducee. The introduction client keeps the
local state for each engine, hands messages over to the engines and
processes the result and state changes they return.
