LibGemini: Implement basic Gemini protocol support

Libraries/LibGemini/GeminiJob.cpp

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+/*
+ * Copyright (c) 2020, The SerenityOS developers.
+ * 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.
+ *
+ * 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 <LibCore/EventLoop.h>
+#include <LibGemini/GeminiJob.h>
+#include <LibGemini/GeminiResponse.h>
+#include <LibTLS/TLSv12.h>
+#include <stdio.h>
+#include <unistd.h>
+
+//#define GEMINIJOB_DEBUG
+
+namespace Gemini {
+
+void GeminiJob::start()
+{
+    ASSERT(!m_socket);
+    m_socket = TLS::TLSv12::construct(this);
+    m_socket->on_tls_connected = [this] {
+#ifdef GEMINIJOB_DEBUG
+        dbg() << "GeminiJob: on_connected callback";
+#endif
+        on_socket_connected();
+    };
+    m_socket->on_tls_error = [this](TLS::AlertDescription error) {
+        if (error == TLS::AlertDescription::HandshakeFailure) {
+            deferred_invoke([this](auto&) {
+                return did_fail(Core::NetworkJob::Error::ProtocolFailed);
+            });
+        } else if (error == TLS::AlertDescription::DecryptError) {
+            deferred_invoke([this](auto&) {
+                return did_fail(Core::NetworkJob::Error::ConnectionFailed);
+            });
+        } else {
+            deferred_invoke([this](auto&) {
+                return did_fail(Core::NetworkJob::Error::TransmissionFailed);
+            });
+        }
+    };
+    m_socket->on_tls_finished = [this] {
+        finish_up();
+    };
+    bool success = ((TLS::TLSv12&)*m_socket).connect(m_request.url().host(), m_request.url().port());
+    if (!success) {
+        deferred_invoke([this](auto&) {
+            return did_fail(Core::NetworkJob::Error::ConnectionFailed);
+        });
+    }
+}
+
+void GeminiJob::shutdown()
+{
+    if (!m_socket)
+        return;
+    m_socket->on_tls_ready_to_read = nullptr;
+    m_socket->on_tls_connected = nullptr;
+    remove_child(*m_socket);
+    m_socket = nullptr;
+}
+
+void GeminiJob::read_while_data_available(Function<IterationDecision()> read)
+{
+    while (m_socket->can_read()) {
+        if (read() == IterationDecision::Break)
+            break;
+    }
+}
+
+void GeminiJob::register_on_ready_to_read(Function<void()> callback)
+{
+    m_socket->on_tls_ready_to_read = [callback = move(callback)](auto&) {
+        callback();
+    };
+}
+
+void GeminiJob::register_on_ready_to_write(Function<void()> callback)
+{
+    m_socket->on_tls_ready_to_write = [callback = move(callback)](auto&) {
+        callback();
+    };
+}
+
+bool GeminiJob::can_read_line() const
+{
+    return m_socket->can_read_line();
+}
+
+ByteBuffer GeminiJob::read_line(size_t size)
+{
+    return m_socket->read_line(size);
+}
+
+ByteBuffer GeminiJob::receive(size_t size)
+{
+    return m_socket->read(size);
+}
+
+bool GeminiJob::can_read() const
+{
+    return m_socket->can_read();
+}
+
+bool GeminiJob::eof() const
+{
+    return m_socket->eof();
+}
+
+bool GeminiJob::write(const ByteBuffer& data)
+{
+    return m_socket->write(data);
+}
+
+}