Add support for zboard topics

src/rpc.cpp

@@ -807,3 +807,57 @@ void RPC::refreshZECPrice() {
         Settings::getInstance()->setZECPrice(0);
     });
 }
+
+// Fetch the Z-board topics list
+void RPC::getZboardTopics(std::function<void(QMap<QString, QString>)> cb) {
+    if (conn == nullptr)
+        return noConnection();
+
+    QUrl cmcURL("http://z-board.net/listTopics");
+
+    QNetworkRequest req;
+    req.setUrl(cmcURL);
+
+    QNetworkReply *reply = conn->restclient->get(req);
+
+    QObject::connect(reply, &QNetworkReply::finished, [=] {
+        reply->deleteLater();
+
+        try {
+            if (reply->error() != QNetworkReply::NoError) {
+                auto parsed = json::parse(reply->readAll(), nullptr, false);
+                if (!parsed.is_discarded() && !parsed["error"]["message"].is_null()) {
+                    qDebug() << QString::fromStdString(parsed["error"]["message"]);
+                }
+                else {
+                    qDebug() << reply->errorString();
+                }
+                return;
+            }
+
+            auto all = reply->readAll();
+
+            auto parsed = json::parse(all, nullptr, false);
+            if (parsed.is_discarded()) {
+                return;
+            }
+
+            QMap<QString, QString> topics;
+            for (const json& item : parsed["topics"].get<json::array_t>()) {
+                if (item.find("addr") == item.end() || item.find("topicName") == item.end())
+                    return;
+
+                QString addr  = QString::fromStdString(item["addr"].get<json::string_t>());
+                QString topic = QString::fromStdString(item["topicName"].get<json::string_t>());
+                
+                topics.insert(topic, addr);
+            }
+
+            cb(topics);
+        }
+        catch (...) {
+            // If anything at all goes wrong, just set the price to 0 and move on.
+            qDebug() << QString("Caught something nasty");
+        }
+    });
+}