Add Downloader class

Author: adazem009

CMakeLists.txt

@@ -71,6 +71,14 @@ target_link_libraries(scratchcpp PRIVATE nlohmann_json::nlohmann_json)
 target_link_libraries(scratchcpp PRIVATE utf8cpp)
 target_link_libraries(scratchcpp PRIVATE zip)
 
+if (LIBSCRATCHCPP_NETWORK_SUPPORT)
+    include(FetchContent)
+    FetchContent_Declare(cpr GIT_REPOSITORY https://github.com/libcpr/cpr.git
+	                     GIT_TAG 3b15fa82ea74739b574d705fea44959b58142eb8) # 1.10.5
+    FetchContent_MakeAvailable(cpr)
+    target_link_libraries(scratchcpp PRIVATE cpr::cpr)
+endif()
+
 target_compile_definitions(scratchcpp PRIVATE LIBSCRATCHCPP_LIBRARY)
 
 if (LIBSCRATCHCPP_BUILD_UNIT_TESTS)

src/internal/CMakeLists.txt

@@ -8,4 +8,13 @@ target_sources(scratchcpp
     zipreader.h
     projecturl.cpp
     projecturl.h
+    idownloader.h
 )
+
+if (LIBSCRATCHCPP_NETWORK_SUPPORT)
+    target_sources(scratchcpp
+      PRIVATE
+        downloader.cpp
+	downloader.h
+    )
+endif()

src/internal/downloader.cpp

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#include "downloader.h"
+
+using namespace libscratchcpp;
+
+Downloader::Downloader()
+{
+}
+
+void Downloader::startDownload(const std::string &url)
+{
+    if (m_asyncResponse)
+        cancel();
+
+    m_asyncResponse = std::make_unique<cpr::AsyncResponse>(cpr::GetAsync(cpr::Url(url)));
+}
+
+void Downloader::cancel()
+{
+    if (m_asyncResponse) {
+        if (!m_asyncResponse->IsCancelled())
+            (void)(m_asyncResponse->Cancel());
+        m_asyncResponse.reset();
+    }
+}
+
+void Downloader::wait()
+{
+    if (m_asyncResponse) {
+        m_asyncResponse->wait();
+        m_response = m_asyncResponse->get();
+    }
+}
+
+const std::string &Downloader::text() const
+{
+    return m_response.text;
+}

src/internal/downloader.h

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <cpr/api.h>
+#include <cpr/response.h>
+
+#include "idownloader.h"
+
+namespace libscratchcpp
+{
+
+class Downloader : public IDownloader
+{
+    public:
+        Downloader();
+
+        void startDownload(const std::string &url) override;
+        void cancel() override;
+        void wait() override;
+
+        const std::string &text() const override;
+
+    private:
+        std::unique_ptr<cpr::AsyncResponse> m_asyncResponse;
+        cpr::Response m_response;
+};
+
+} // namespace libscratchcpp

src/internal/idownloader.h

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <string>
+
+namespace libscratchcpp
+{
+
+class IDownloader
+{
+    public:
+        virtual ~IDownloader() { }
+
+        virtual void startDownload(const std::string &url) = 0;
+        virtual void cancel() = 0;
+        virtual void wait() = 0;
+
+        virtual const std::string &text() const = 0;
+};
+
+} // namespace libscratchcpp