Update protobuf definitions and refactor message receive and decrypt
codepath to support new protocol, including various flavors of sync
messages (sent messages, contacts, and groups).
Also cleans up background.js and lets libtextsecure internalize
textsecure.processDecrypted and ensure that it is called before handing
DataMessages off to the application.
The Envelope structure now has a generic content field and a
legacyMessage field for backwards compatibility. We'll send outgoing
messages as legacy messages, and sync messages as "content" while
continuing to support both legacy and non-legacy messages on the receive
side until old clients have a chance to transition.
These collections should always be operating with the same model
instances, so let the inbox reset it self from the same in-memory
cache of conversation models used by the conversation windows.
In a multi device world, it's possible to receive a receipt for a sync
message before the sync message actually arrives. In this case we need
to keep the receipt around and the process it when the message shows up.
Clicking on a key conflict message opens the message detail view,
which displays the contact(s) in this conversation. If the message
contains a key conflict with any of these contacts, a button is
displayed which attempts to resolve that conflict and any other
conflicts in the conversation that are related to that contact.
We'd like to live in a world where we can retry all the pending
conflicts in a conversation as a batch, which means we don't want to
wipe the identity key before processing each message. Thus, remove that
step from these handlers and encapsulate in a method on the conversation
model.
Ensure that both tryAgain functions return promises, allowing the
application to take appropriate action in the result of success or
failure. This lets us remove all dependency from libtextsecure on
app-level constructs like message objects/ids and the `extenion.trigger`
function.
Corresponding frontend changes to follow in another commit.
Update unreadCounts per-conversation on incoming messages. Render unread
conversations with font-weigh: bold in the inbox view.
To ensure that the inbox and conversation views remain in sync, the
background page now ensures that the same models objects are used for
both views.
Sometimes a conversation's messages would be reverse-ordered on first
load, correcting themselves after a refresh. This is an artifact of the
order we load messages from the database. To fix, load them in the
opposite order.
The alternative solution would be to reset the collection every time we
fetch new messages, but this would create an entirely new set of model
objects each time, which seems unnecessary.
The message view has three flavors so far, a normal text+attachments
message, a group update, and an end session message. This changeset
extracts the normal message rendering into its own subview, and adds
some convenience functions to the message model in order to simplify
some of that flavoring logic.
