ProtocolServer+LibProtocol: Introduce a server for handling downloads

This patch adds ProtocolServer, a server that handles network requests
on behalf of its clients. The first protocol implemented is HTTP.

The idea here is to use a plug-in architecture where any number of
protocols can be added and implemented without having to mess around
with each client program that wants to use the protocol.

A simple client API is provided through LibProtocol::Client. :^)

1 files changed, 63 insertions, 0 deletions

diff --git a/Servers/ProtocolServer/PSClientConnection.cpp b/Servers/ProtocolServer/PSClientConnection.cpp
new file mode 100644
index 0000000000..fb93268efe
--- /dev/null
+++ b/Servers/ProtocolServer/PSClientConnection.cpp
@@ -0,0 +1,63 @@
+#include <ProtocolServer/Download.h>
+#include <ProtocolServer/PSClientConnection.h>
+#include <ProtocolServer/Protocol.h>
+#include <ProtocolServer/ProtocolClientEndpoint.h>
+
+static HashMap<int, RefPtr<PSClientConnection>> s_connections;
+
+PSClientConnection::PSClientConnection(CLocalSocket& socket, int client_id)
+    : ConnectionNG(*this, socket, client_id)
+{
+    s_connections.set(client_id, *this);
+}
+
+PSClientConnection::~PSClientConnection()
+{
+}
+
+void PSClientConnection::die()
+{
+    s_connections.remove(client_id());
+}
+
+OwnPtr<ProtocolServer::IsSupportedProtocolResponse> PSClientConnection::handle(const ProtocolServer::IsSupportedProtocol& message)
+{
+    bool supported = Protocol::find_by_name(message.protocol().to_lowercase());
+    return make<ProtocolServer::IsSupportedProtocolResponse>(supported);
+}
+
+OwnPtr<ProtocolServer::StartDownloadResponse> PSClientConnection::handle(const ProtocolServer::StartDownload& message)
+{
+    URL url(message.url());
+    ASSERT(url.is_valid());
+    auto* protocol = Protocol::find_by_name(url.protocol());
+    ASSERT(protocol);
+    auto download = protocol->start_download(*this, url);
+    return make<ProtocolServer::StartDownloadResponse>(download->id());
+}
+
+OwnPtr<ProtocolServer::StopDownloadResponse> PSClientConnection::handle(const ProtocolServer::StopDownload& message)
+{
+    auto* download = Download::find_by_id(message.download_id());
+    bool success = false;
+    if (download) {
+        download->stop();
+    }
+    return make<ProtocolServer::StopDownloadResponse>(success);
+}
+
+void PSClientConnection::did_finish_download(Badge<Download>, Download& download, bool success)
+{
+    post_message(ProtocolClient::DownloadFinished(download.id(), success));
+}
+
+void PSClientConnection::did_progress_download(Badge<Download>, Download& download)
+{
+    post_message(ProtocolClient::DownloadProgress(download.id(), download.total_size(), download.downloaded_size()));
+}
+
+OwnPtr<ProtocolServer::GreetResponse> PSClientConnection::handle(const ProtocolServer::Greet& message)
+{
+    set_client_pid(message.client_pid());
+    return make<ProtocolServer::GreetResponse>(getpid(), client_id());
+}