SpiceAgent: Implement ClipboardRequest messages

Author: https://github.com/caoimhebyrne
Commit: https://github.com/SerenityOS/serenity/commit/9c4538a9a8
Pull-request: https://github.com/SerenityOS/serenity/pull/18834
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/drunderscore
Reviewed-by: https://github.com/supercomputer7

Userland/Services/SpiceAgent/Message.cpp

@@ -85,4 +85,30 @@ ErrorOr<String> ClipboardGrabMessage::debug_description()
     return builder.to_string();
 }
 
+ErrorOr<ClipboardRequestMessage> ClipboardRequestMessage::read_from_stream(AK::Stream& stream)
+{
+    auto value = TRY(stream.read_value<u32>());
+    if (value >= to_underlying(ClipboardDataType::__End)) {
+        return Error::from_string_literal("Unsupported clipboard type");
+    }
+
+    auto type = static_cast<ClipboardDataType>(value);
+    return ClipboardRequestMessage(type);
+}
+
+ErrorOr<void> ClipboardRequestMessage::write_to_stream(AK::Stream& stream)
+{
+    TRY(stream.write_value(data_type()));
+    return {};
+}
+
+ErrorOr<String> ClipboardRequestMessage::debug_description()
+{
+    StringBuilder builder;
+    TRY(builder.try_append("ClipboardRequest { "sv));
+    TRY(builder.try_appendff("data_type = {}", data_type()));
+    TRY(builder.try_append(" }"sv));
+    return builder.to_string();
+}
+
 }

Userland/Services/SpiceAgent/Message.h

@@ -130,6 +130,26 @@ private:
     Vector<ClipboardDataType> m_types;
 };
 
+// Request clipboard data with the specified type.
+class ClipboardRequestMessage : public Message {
+public:
+    ClipboardRequestMessage(ClipboardDataType data_type)
+        : Message(Type::ClipboardRequest)
+        , m_data_type(data_type)
+    {
+    }
+
+    static ErrorOr<ClipboardRequestMessage> read_from_stream(AK::Stream& stream);
+
+    ErrorOr<void> write_to_stream(AK::Stream& stream);
+    ErrorOr<String> debug_description() override;
+
+    ClipboardDataType data_type() { return m_data_type; }
+
+private:
+    ClipboardDataType m_data_type;
+};
+
 }
 
 namespace AK {

Userland/Services/SpiceAgent/SpiceAgent.cpp

@@ -74,6 +74,10 @@ ErrorOr<void> SpiceAgent::on_message_received()
             break;
 
         dbgln_if(SPICE_AGENT_DEBUG, "The spice server has notified us of new clipboard data of type: {}", data_type);
+        dbgln_if(SPICE_AGENT_DEBUG, "Sending a request for data of type: {}", data_type);
+
+        auto request_message = ClipboardRequestMessage(data_type);
+        TRY(this->send_message(request_message));
 
         break;
     }