Upravljanje stikov
V tem oddelku se prikaže, kako najti in dodati stik iz DHT k stranki.
Prisotnost v omrežju
Objavite prisotnost na DHT.
Prisotnost je precej preprosta za objavo na DHT. Pravzaprav je to samo vrednost, ki vsebuje hash naprave (glejte prejšnji oddelek, kontno upravljanje) na hash, ki ustreza odtiskom ključa. Torej, če imamo račun bf5f1e21d3eb2c1246946aa49d5dcf3e5b9cb1b9 z napravom 62fbdff0ce86f368c7d3c2682539e5ba9e06404f, bo naslednja opredeljena vrednost poslana preko DHT:
/**
* Device announcement stored on DHT.
*/
struct DeviceAnnouncement : public dht::SignedValue<DeviceAnnouncement>
{
private:
using BaseClass = dht::SignedValue<DeviceAnnouncement>;
public:
static const constexpr dht::ValueType& TYPE = dht::ValueType::USER_DATA;
dht::InfoHash dev;
std::shared_ptr<dht::crypto::PublicKey> pk;
MSGPACK_DEFINE_MAP(dev, pk)
};
(Ta vrednost lahko postavite z dht_.put(h, VALUE, dht::DoneCallback{}, {}, true);, kot stalna postavka). Če je naprava najavljena, je naprava prisotna. Za zdaj ni načina, da izbrišete ali urejate vrednost na DHT (to bo prišlo, ko bo OpenDHT podprl ECC).
Pokliči, če je prisoten stik.
Now our presence on the network, it’s time to get if somebody is present on the DHT. With the previous section, it’s easy to do the reverse process. To know if somebody is present on the DHT (ex: bf5f1e21d3eb2c1246946aa49d5dcf3e5b9cb1b9), we have to get value at bf5f1e21d3eb2c1246946aa49d5dcf3e5b9cb1b9 and retrieve the DeviceAnnouncement on this hash. The related code in the daemon is in jamiaccount.cpp:
auto shared = std::static_pointer_cast<RingAccount>(shared_from_this());
auto treatedDevices = std::make_shared<std::set<dht::InfoHash>>();
dht_.get<dht::crypto::RevocationList>(to, [to](dht::crypto::RevocationList&& crl){
tls::CertificateStore::instance().pinRevocationList(to.toString(), std::move(crl));
return true;
});
dht_.get<DeviceAnnouncement>(to, [shared,to,treatedDevices,op](DeviceAnnouncement&& dev) {
if (dev.from != to)
return true;
if (treatedDevices->emplace(dev.dev).second)
op(shared, dev.dev);
return true;
}, [=](bool /*ok*/){
{
std::lock_guard<std::recursive_mutex> lock(shared->buddyInfoMtx);
auto buddy_info_it = shared->trackedBuddies_.find(to);
if (buddy_info_it != shared->trackedBuddies_.end()) {
if (not treatedDevices->empty()) {
for (auto& device_id : *treatedDevices)
shared->onTrackedBuddyOnline(buddy_info_it, device_id);
} else
shared->onTrackedBuddyOffline(buddy_info_it);
}
}
RING_DBG("[Account %s] found %lu devices for %s",
getAccountID().c_str(), treatedDevices->size(), to.to_c_str());
if (end) end(shared, not treatedDevices->empty());
});
In to je vse.
Client perspective
<method name="subscribeBuddy" tp:name-for-bindings="subscribeBuddy">
<tp:docstring>
Ask be be notified when 'uri' presence change
</tp:docstring>
<tp:added version="1.3.0"/>
<arg type="s" name="accountID" direction="in">
<tp:docstring>
An account from which get request presence informations
</tp:docstring>
</arg>
<arg type="s" name="uri" direction="in">
<tp:docstring>
A SIP uri to watch
</tp:docstring>
</arg>
<arg type="b" name="flag" direction="in">
<tp:docstring>
</tp:docstring>
</arg>
</method>
<signal name="newBuddyNotification" tp:name-for-bindings="newBuddyNotification">
<tp:added version="1.3.0"/>
<tp:docstring>
Notify when a registered presence uri presence informations changes
</tp:docstring>
<arg type="s" name="accountID">
<tp:docstring>
The associated account
</tp:docstring>
</arg>
<arg type="s" name="buddyUri">
<tp:docstring>
The registered URI
</tp:docstring>
</arg>
<arg type="i" name="status">
<tp:docstring>
Is the URI present or not
</tp:docstring>
</arg>
<arg type="s" name="lineStatus">
<tp:docstring>
A string containing informations from the user (human readable)
</tp:docstring>
</arg>
</signal>
<method name="publish" tp:name-for-bindings="publish">
<tp:added version="1.3.0"/>
<arg type="s" name="accountID" direction="in">
<tp:docstring>
The account from which the presence will be emitted
</tp:docstring>
</arg>
<arg type="b" name="status" direction="in">
<tp:docstring>
Is this account present or not
</tp:docstring>
</arg>
<arg type="s" name="note" direction="in">
<tp:docstring>
A message transmitted by the server to other users
</tp:docstring>
</arg>
</method>
Are the main APIs for clients. subscribeBuddy will listen on the DHT to detect presence changes and newBuddyNotification will be sent whenever a new status is detected:
The status sent to the client is now 0=offline (no device found on the DHT), 1=dht_presence (at least a device is found on the DHT), 2=connected (with a TCP + SIP channel, so ready to exchange data).
lineStatuswill contain any custom status sent by the peer (e.g. Lunch Time!)
publish is used for publishing a custom note (status is ignored for Jami accounts, note will contain the custom status).
RFC3863 is used to send status over the SIP connection.
Zahtevki v teku
Pošlji zahtevo.
Vprašanje za plovilo TODO
Na koncu, ko je zahtevek za zaupnost narejen, ga lahko premaknemo na naslednjo hash: InfoHash("poslovno polje:" + napravaId)
V tem demonu se uporablja naslednja koda:
dht_.putEncrypted(dht::InfoHash::get("inbox:"+dev.toString()), dev, dht::TrustRequest(DHT_TYPE_NS, payload));
Prijemajo zahtevo
Vsaka država
(Prijema/Blokira/Odpusti)
API za daemon
Vse metode spremljanja prisotnosti prijatelja se nahajajo v PresenceManager, kot so:
<signal name="newBuddyNotification" tp:name-for-bindings="newBuddyNotification">
<tp:added version="1.3.0"/>
<tp:docstring>
Notify when a registered presence uri presence informations changes
</tp:docstring>
<arg type="s" name="accountID">
<tp:docstring>
The associated account
</tp:docstring>
</arg>
<arg type="s" name="buddyUri">
<tp:docstring>
The registered URI
</tp:docstring>
</arg>
<arg type="b" name="status">
<tp:docstring>
Is the URI present or not
</tp:docstring>
</arg>
<arg type="s" name="lineStatus">
<tp:docstring>
A string containing informations from the user (human readable)
</tp:docstring>
</arg>
</signal>
Vse metode in signali, ki se uporabljajo za upravljanje zahtev za zaupanje in stikov, so v ConfigurationManager, kot so:
<method name="getTrustRequests" tp:name-for-bindings="getTrustRequests">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<annotation name="org.qtproject.QtDBus.QtTypeName.Out0" value="VectorMapStringString"/>
<arg type="aa{ss}" name="requests" direction="out" >
<tp:docstring>
A list of contact request details. Details:
- from: account ID of sender
- received: UNIX timestamp of reception date
- payload: attached payload
</tp:docstring>
</arg>
</method>
<method name="acceptTrustRequest" tp:name-for-bindings="acceptTrustRequest">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="from" direction="in">
</arg>
<arg type="b" name="success" direction="out" tp:type="Boolean">
<tp:docstring>
True if the operation succeeded.
</tp:docstring>
</arg>
</method>
<method name="discardTrustRequest" tp:name-for-bindings="discardTrustRequest">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="from" direction="in">
</arg>
<arg type="b" name="success" direction="out" tp:type="Boolean">
<tp:docstring>
True if the operation succeeded.
</tp:docstring>
</arg>
</method>
<signal name="incomingTrustRequest" tp:name-for-bindings="incomingTrustRequest">
<tp:added version="2.2.0"/>
<tp:docstring>
Notify clients that a new contact request has been received.
</tp:docstring>
<arg type="s" name="accountID">
</arg>
<arg type="s" name="from">
</arg>
<arg type="ay" name="payload">
</arg>
<arg type="t" name="receiveTime">
</arg>
</signal>
<method name="sendTrustRequest" tp:name-for-bindings="sendTrustRequest">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="to" direction="in">
</arg>
<arg type="ay" name="payload" direction="in">
</arg>
</method>
<method name="addContact" tp:name-for-bindings="addContact">
<tp:added version="3.0.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="uri" direction="in">
</arg>
</method>
<method name="removeContact" tp:name-for-bindings="removeContact">
<tp:added version="3.0.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="uri" direction="in">
</arg>
<arg type="b" name="ban" direction="in" tp:type="Boolean">
<tp:docstring>
True if the the contact should be banned.
If false, the contact is removed from the contact list (banned or not).
</tp:docstring>
</arg>
</method>
Če želite nekaj primerov, se te metode uporabljajo v contactmodel.cpp v LRC.