network: provide common HTTP GET functionality with js callbacks

src/qt/network.cpp

@@ -0,0 +1,92 @@
+// Copyright (c) 2014-2019, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "network.h"
+
+#include <QDebug>
+#include <QtCore>
+
+// TODO: wallet_merged - epee library triggers the warnings
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wreorder"
+#include <net/http_client.h>
+#pragma GCC diagnostic pop
+
+#include "utils.h"
+
+Network::Network(QObject *parent)
+    : QObject(parent)
+    , m_scheduler(this)
+{
+}
+
+void Network::get(const QString &url, const QJSValue &callback, const QString &contentType) const
+{
+    qDebug() << QString("Fetching: %1").arg(url);
+
+    m_scheduler.run(
+        [url, contentType] {
+            epee::net_utils::http::http_simple_client httpClient;
+
+            const QUrl urlParsed(url);
+            httpClient.set_server(urlParsed.host().toStdString(), urlParsed.scheme() == "https" ? "443" : "80", {});
+
+            const QString uri = (urlParsed.hasQuery() ? urlParsed.path() + "?" + urlParsed.query() : urlParsed.path());
+            const epee::net_utils::http::http_response_info *pri = NULL;
+            constexpr std::chrono::milliseconds timeout = std::chrono::seconds(15);
+
+            epee::net_utils::http::fields_list headers({{"User-Agent", randomUserAgent().toStdString()}});
+            if (!contentType.isEmpty())
+            {
+                headers.push_back({"Content-Type", contentType.toStdString()});
+            }
+            const bool result = httpClient.invoke(uri.toStdString(), "GET", {}, timeout, std::addressof(pri), headers);
+
+            if (!result)
+            {
+                return QJSValueList({QJSValue(), QJSValue(), "unknown error"});
+            }
+            if (!pri)
+            {
+                return QJSValueList({QJSValue(), QJSValue(), "internal error (null response ptr)"});
+            }
+            if (pri->m_response_code != 200)
+            {
+                return QJSValueList({QJSValue(), QJSValue(), QString("response code: %1").arg(pri->m_response_code)});
+            }
+
+            return QJSValueList({url, QString::fromStdString(pri->m_body)});
+        },
+        callback);
+}
+
+void Network::getJSON(const QString &url, const QJSValue &callback) const
+{
+    get(url, callback, "application/json; charset=utf-8");
+}