input/tidal: new input plugin to receive Tidal streams

src/input/plugins/TidalInputPlugin.cxx

@@ -0,0 +1,174 @@
+/*
+ * Copyright 2003-2018 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "TidalInputPlugin.hxx"
+#include "TidalSessionManager.hxx"
+#include "TidalTrackRequest.hxx"
+#include "CurlInputPlugin.hxx"
+#include "PluginUnavailable.hxx"
+#include "input/ProxyInputStream.hxx"
+#include "input/FailingInputStream.hxx"
+#include "input/InputPlugin.hxx"
+#include "config/Block.hxx"
+#include "thread/Mutex.hxx"
+#include "util/StringCompare.hxx"
+
+#include <stdexcept>
+#include <memory>
+
+static TidalSessionManager *tidal_session;
+
+class TidalInputStream final
+	: public ProxyInputStream, TidalSessionHandler, TidalTrackHandler {
+
+	const std::string track_id;
+
+	std::unique_ptr<TidalTrackRequest> track_request;
+
+	std::exception_ptr error;
+
+public:
+	TidalInputStream(const char *_uri, const char *_track_id,
+			 Mutex &_mutex, Cond &_cond) noexcept
+		:ProxyInputStream(_uri, _mutex, _cond),
+		 track_id(_track_id)
+	{
+		tidal_session->AddLoginHandler(*this);
+	}
+
+	~TidalInputStream() {
+		tidal_session->RemoveLoginHandler(*this);
+	}
+
+	/* virtual methods from InputStream */
+
+	void Check() override {
+		if (error)
+			std::rethrow_exception(error);
+	}
+
+private:
+	void Failed(std::exception_ptr e) {
+		SetInput(std::make_unique<FailingInputStream>(GetURI(), e,
+							      mutex, cond));
+	}
+
+	/* virtual methods from TidalSessionHandler */
+	void OnTidalSession() noexcept override;
+
+	/* virtual methods from TidalTrackHandler */
+	void OnTidalTrackSuccess(std::string &&url) noexcept override;
+	void OnTidalTrackError(std::exception_ptr error) noexcept override;
+};
+
+void
+TidalInputStream::OnTidalSession() noexcept
+{
+	const std::lock_guard<Mutex> protect(mutex);
+
+	try {
+		TidalTrackHandler &handler = *this;
+		track_request = std::make_unique<TidalTrackRequest>(tidal_session->GetCurl(),
+								    tidal_session->GetBaseUrl(),
+								    tidal_session->GetToken(),
+								    tidal_session->GetSession().c_str(),
+								    track_id.c_str(),
+								    handler);
+	} catch (...) {
+		Failed(std::current_exception());
+	}
+}
+
+void
+TidalInputStream::OnTidalTrackSuccess(std::string &&url) noexcept
+{
+	const std::lock_guard<Mutex> protect(mutex);
+
+	try {
+		SetInput(OpenCurlInputStream(url.c_str(), {},
+					     mutex, cond));
+	} catch (...) {
+		Failed(std::current_exception());
+	}
+}
+
+void
+TidalInputStream::OnTidalTrackError(std::exception_ptr e) noexcept
+{
+	const std::lock_guard<Mutex> protect(mutex);
+
+	Failed(e);
+}
+
+static void
+InitTidalInput(EventLoop &event_loop, const ConfigBlock &block)
+{
+	const char *base_url = block.GetBlockValue("base_url",
+						   "https://api.tidal.com/v1");
+
+	const char *token = block.GetBlockValue("token");
+	if (token == nullptr)
+		throw PluginUnavailable("No Tidal application token configured");
+
+	const char *username = block.GetBlockValue("username");
+	if (username == nullptr)
+		throw PluginUnavailable("No Tidal username configured");
+
+	const char *password = block.GetBlockValue("password");
+	if (password == nullptr)
+		throw PluginUnavailable("No Tidal password configured");
+
+	// TODO: "audioquality" setting
+
+	tidal_session = new TidalSessionManager(event_loop, base_url, token,
+						username, password);
+}
+
+static void
+FinishTidalInput()
+{
+	delete tidal_session;
+}
+
+static InputStreamPtr
+OpenTidalInput(const char *uri, Mutex &mutex, Cond &cond)
+{
+	assert(tidal_session != nullptr);
+
+	const char *track_id;
+
+	track_id = StringAfterPrefix(uri, "tidal://track/");
+	if (track_id == nullptr)
+		track_id = StringAfterPrefix(uri, "https://listen.tidal.com/track/");
+
+	if (track_id == nullptr || *track_id == 0)
+		return nullptr;
+
+	// TODO: validate track_id
+
+	return std::make_unique<TidalInputStream>(uri, track_id, mutex, cond);
+}
+
+const InputPlugin tidal_input_plugin = {
+	"tidal",
+	InitTidalInput,
+	FinishTidalInput,
+	OpenTidalInput,
+};