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this will prevent silent notifications (for example those supressed by grace period) showing up on my smart watch
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finishing (sending a key transport message in response to pre key message) as
well as reparing sessions will leak resource and availability and might in
certain situations in group chat leak the Jabber ID.
Therefor we disable that. Leaking resource might not be considered harmful by
a lot of people however we have always doing similar things with receipts.
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XML and by inheritence XMPP has the feature of transmitting multiple language
variants for the same content. This can be really useful if, for example, you
are talking to an automated system. A chat bot could greet you in your own
language.
On the wire this will usually look like this:
```xml
<message to="you">
<body>Good morning</body>
<body xml:lang="de">Guten Morgen</body>
</message>
```
However receiving such a message in a group chat can be very confusing and
potentially dangerous if the sender puts conflicting information in there and
different people get shown different strings.
Disabling support for localization entirely isn’t an ideal solution as on
principle it is still a good feature; and other clients might still show a
localization even if Conversations would always show the default language.
So instead we now show the displayed language in a corner of the
message bubble if more than one translation has been received.
If multiple languages are received we will attempt to find one in
the language the operating system is set to. If no such translation can be
found it will attempt to display the English string.
If English can not be found either (for example a message that only has ru and
fr on a phone that is set to de) it will display what ever language came first.
Furthermore we will discard (not show at all) messages with with
multiple bodies of the same language. (This is considered an invalid message)
The language tag will not be shown if we receive a single body in
a language not understood by the user. (For example operating system set to
'de' and message received with one body in 'ru' will just display that body as
usual.)
As a guide line to the user: If you are reading a message where it is important
that this message is not interpreted differently by different people (like a
vote (+1 / -1) in a chat room) make sure it has *no* language tag.
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during live messages we only store the bare real jid; on muc catch up we might get the full jid
for that reason we only compare bare jids
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Staying connected to a MUC room hosted on a remote server can be challenging.
If a server reboots it will usually send a shut down notification to all
participants. However even if a client knows that a server was shut down it
doesn’t know when it comes up again. In some corner cases that shut down
notification might not even be delivered successfully leaving the client in a
state where it thinks it is connected but it really isn’t.
The possible work around implemented in this commit is to register the clients
full JID (user@domain.tld/Conversations.r4nd) as an App Server according to
XEP-0357 with the room. (Conversations checks for the push:0 namespace on the
room.)
After cycling through a reboot the first message send to a room will trigger
pubsub notifications to each registered full JID. This event will be used to
trigger a XEP-0410 ping and if necessary a subsequent rejoin of the MUC.
If the resource has become unavailable during down time of the MUC server the
user’s server will respond with an IQ error which in turn leads to the MUC
server disabling that push target.
Leaving a MUC will send a `disable` command. If sending that disable command
failed for some reason (network outage) and the client receives a pubsub
notification for a room it is no longer joined in it will respond with an
item-not-found IQ error which also disables subsequent pushes from the server.
Note: We 0410-ping before a join to avoid unnecessary full joins which can be
quite costly. Further client side optimizations will also suppress pings when
a ping is already in flight to further save traffic.
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fec6d7a90c443ef0ef86464bd2fb49cdc56d1587
only for type=groupchat
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fixes #283
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If conversion feature is not available we will never write to PEP
therefor it is not advisable to process PEP events; otherwise
the changes we do might not land in PEP.
simply ignoring PEP is probably better than dynamically removing + notify
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after receiving a SignalMessage that can’t be decrypted because of broken sessions
Conversations will attempt to grab a new pre key bundle and send a new PreKeySignalMessage
wrapped in a key transport message.
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