Управљање контактима

Ovaj odeljak će predstaviti kako pronaći i dodati kontakt sa DHT-a klijentu. Ovde neće biti objašnjena upotreba servera imena. Ako želite više detalja o tome, pročitajte Име Протокол сервера.

Присуство у мрежи

Анонсирајте присуство на ДХТ-у

Присуство је прилично једноставно да се најави на ДХТ. заправо, то је само вредност која садржи хаш уређаја (види претходни део, акунт-менеджмент) на хаш који одговара прстима кључа. Дакле, ако имамо рачун bf5f1e21d3eb2c1246946aa49d5dcf3e5b9cb1b9 са уређајем 62fbdff0ce86f368c7d3c2682539e5ba9e06404f, следећа дефинисана вредност ће бити послана преко ДХТ:

/**
 * 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)
};

(Ova vrednost se može staviti sa dht_.put(h, VALUE, dht::DoneCallback{}, {}, true);, kao trajnо). Ako je uređaj najavljen, uređaj je prisutan. Za sada, ne postoji način da izbrišete ili uredite vrednost na DHT-u (ovo će se dogoditi kada OpenDHT bude podržavao ECC). Dakle, prisustvo uvek ima kašnjenje za sada (srednje kašnjenje: expire-time/2, dakle 2min30 za sada).

Позвали ако је присутан контакт

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());
});

И то је све.

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).
lineStatus will 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.

Уочењени захтев

Pošalji zahtev

Замоја о бродовима TODO

На крају, када је захтев за поверење израђен, можемо да поносимо захтев на следећи хаш: ИнфоХаш("поштова:" + уређајId)

У демону се користи следећи код:

dht_.putEncrypted(dht::InfoHash::get("inbox:"+dev.toString()), dev, dht::TrustRequest(DHT_TYPE_NS, payload));

Пријем захтева

Тодо

(Прихватање/блоковање/отпадање)

API-а Дајмона

Сви методи за праћење присуства пријатеља се налазе у PresenceManager као што су:

<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>

Sve metode i signali koji se koriste za upravljanje zahtevima i kontaktima o poverenju nalaze se u ConfigurationManager-u kao što su:

<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>

Ако желите неке примери, ове методе се користе у contactmodel.cpp у ЛРЦ.