SboxSuperuser/Core/Messages/MessageCodec.cs
Serialization helper for a message-template store. Reads and validates a versioned JSON state document into a dictionary of template keys to strings, and writes the dictionary back out with a schema version of 1.
using System.Text.Json;
using SboxSuperuser.Core.Storage;
namespace SboxSuperuser.Core.Messages;
/// <summary>Stores only the templates a server has changed, as {"schema":1,"templates":{key:template}}.</summary>
internal static class MessageCodec
{
/// <summary>Reads the state object itself, without the stored document's envelope.</summary>
internal static IReadOnlyDictionary<string, string> ReadState( string stateJson )
{
using var json = JsonDocument.Parse( stateJson );
var state = json.RootElement;
StoreFormat.RequireFields( state, "schema", "templates" );
if ( state.GetProperty( "schema" ).GetInt32() != 1 ) throw new UnsupportedStoreSchemaException();
var templates = new Dictionary<string, string>( StringComparer.Ordinal );
foreach ( var entry in state.GetProperty( "templates" ).EnumerateObject() ) templates[ entry.Name ] = entry.Value.GetString();
return templates;
}
internal static string WriteState( IReadOnlyDictionary<string, string> templates ) =>
JsonSerializer.Serialize( new { schema = 1, templates } );
}