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* Networkstack: easy happy eyeball
* Networkstack: drop own implementation of DNS-Server selection
Co-authored-by: Christian Schneppe <kriztan@users.noreply.github.com>
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possibly fixes #417, but I couldn't check this, because I can't reproduce the problems. Feel free to reopen it with updated logs.
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previously we signalled succesfull file reception after receiving enough bytes on ibb;
however that causes us to race with the session-info file hash. now the recipient will wait for
<close/> and the sender will make sure to send the session-info before sending close.
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incoming direct connections in receive mode wouldn’t clear the entire
destination from the input stream; thus adding a leading 0x00 to the file
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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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fixes #374
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This reverts commit e6a15597904019f68c02e6fd8f61fb6de0b13324.
If there is IPv6 available but the server doesn't listen to it, the connection will not be established
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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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fixes #360
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