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using Gee;
namespace Xmpp.Xep.EntityCapabilities {
private const string NS_URI = "http://jabber.org/protocol/caps";
public class Module : XmppStreamModule {
public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, "0115_entity_capabilities");
private string own_ver_hash;
private Storage storage;
public Module(Storage storage) {
this.storage = storage;
}
private string get_own_hash(XmppStream stream) {
if (own_ver_hash == null) {
own_ver_hash = compute_hash(stream.get_module(ServiceDiscovery.Module.IDENTITY).identities, stream.get_flag(ServiceDiscovery.Flag.IDENTITY).features);
}
return own_ver_hash;
}
public override void attach(XmppStream stream) {
stream.get_module(Presence.Module.IDENTITY).pre_send_presence_stanza.connect(on_pre_send_presence_stanza);
stream.get_module(Presence.Module.IDENTITY).received_presence.connect(on_received_presence);
stream.get_module(ServiceDiscovery.Module.IDENTITY).add_feature(stream, NS_URI);
}
public override void detach(XmppStream stream) {
stream.get_module(Presence.Module.IDENTITY).pre_send_presence_stanza.disconnect(on_pre_send_presence_stanza);
stream.get_module(Presence.Module.IDENTITY).received_presence.disconnect(on_received_presence);
}
public override string get_ns() { return NS_URI; }
public override string get_id() { return IDENTITY.id; }
private void on_pre_send_presence_stanza(XmppStream stream, Presence.Stanza presence) {
if (presence.type_ == Presence.Stanza.TYPE_AVAILABLE) {
presence.stanza.put_node(new StanzaNode.build("c", NS_URI).add_self_xmlns()
.put_attribute("hash", "sha-1")
.put_attribute("node", "https://dino.im")
.put_attribute("ver", get_own_hash(stream)));
}
}
private void on_received_presence(XmppStream stream, Presence.Stanza presence) {
StanzaNode? c_node = presence.stanza.get_subnode("c", NS_URI);
if (c_node != null) {
string? ver_attribute = c_node.get_attribute("ver", NS_URI);
if (ver_attribute == null) return;
Gee.List<string> capabilities = storage.get_features(ver_attribute);
if (capabilities.size == 0) {
stream.get_module(ServiceDiscovery.Module.IDENTITY).request_info(stream, presence.from, (stream, query_result) => {
store_entity_result(stream, ver_attribute, query_result);
});
} else {
stream.get_flag(ServiceDiscovery.Flag.IDENTITY).set_entity_features(presence.from, capabilities);
}
}
}
private void store_entity_result(XmppStream stream, string entity, ServiceDiscovery.InfoResult? query_result) {
if (query_result == null) return;
if (compute_hash(query_result.identities, query_result.features) == entity) {
storage.store_features(entity, query_result.features);
stream.get_flag(ServiceDiscovery.Flag.IDENTITY).set_entity_features(query_result.iq.from, query_result.features);
}
}
private static string compute_hash(Gee.List<ServiceDiscovery.Identity> identities, Gee.List<string> features) {
identities.sort(compare_identities);
features.sort();
string s = "";
foreach (ServiceDiscovery.Identity identity in identities) {
string s_identity = identity.category + "/" + identity.type_ + "//";
if (identity.name != null) s_identity += identity.name;
s_identity += "<";
s += s_identity;
}
foreach (string feature in features) {
s += feature + "<";
}
Checksum c = new Checksum(ChecksumType.SHA1);
c.update(s.data, -1);
size_t size = 20;
uint8[] buf = new uint8[size];
c.get_digest(buf, ref size);
return Base64.encode(buf);
}
private static int compare_identities(ServiceDiscovery.Identity a, ServiceDiscovery.Identity b) {
int category_comp = a.category.collate(b.category);
if (category_comp != 0) return category_comp;
int type_comp = a.type_.collate(b.type_);
if (type_comp != 0) return type_comp;
// TODO lang
return 0;
}
}
public interface Storage : Object {
public abstract void store_features(string entity, Gee.List<string> capabilities);
public abstract Gee.List<string> get_features(string entity);
}
}
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