restore InterfaceProxyFactory to encapsulate Pintail (#830)

1 files changed, 42 insertions, 0 deletions

diff --git a/src/SMAPI/Framework/Reflection/InterfaceProxyFactory.cs b/src/SMAPI/Framework/Reflection/InterfaceProxyFactory.cs
new file mode 100644
index 00000000..40adde8e
--- /dev/null
+++ b/src/SMAPI/Framework/Reflection/InterfaceProxyFactory.cs
@@ -0,0 +1,42 @@
+using System.Reflection;
+using System.Reflection.Emit;
+using Nanoray.Pintail;
+
+namespace StardewModdingAPI.Framework.Reflection
+{
+    /// <summary>Generates proxy classes to access mod APIs through an arbitrary interface.</summary>
+    internal class InterfaceProxyFactory
+    {
+        /*********
+        ** Fields
+        *********/
+        /// <summary>The underlying proxy type builder.</summary>
+        private readonly IProxyManager<string> ProxyManager;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        public InterfaceProxyFactory()
+        {
+            AssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName($"StardewModdingAPI.Proxies, Version={this.GetType().Assembly.GetName().Version}, Culture=neutral"), AssemblyBuilderAccess.Run);
+            ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("StardewModdingAPI.Proxies");
+            this.ProxyManager = new ProxyManager<string>(moduleBuilder, new ProxyManagerConfiguration<string>(
+                proxyPrepareBehavior: ProxyManagerProxyPrepareBehavior.Eager,
+                proxyObjectInterfaceMarking: ProxyObjectInterfaceMarking.Disabled
+            ));
+        }
+
+        /// <summary>Create an API proxy.</summary>
+        /// <typeparam name="TInterface">The interface through which to access the API.</typeparam>
+        /// <param name="instance">The API instance to access.</param>
+        /// <param name="sourceModID">The unique ID of the mod consuming the API.</param>
+        /// <param name="targetModID">The unique ID of the mod providing the API.</param>
+        public TInterface CreateProxy<TInterface>(object instance, string sourceModID, string targetModID)
+            where TInterface : class
+        {
+            return this.ProxyManager.ObtainProxy<string, TInterface>(instance, targetContext: targetModID, proxyContext: sourceModID);
+        }
+    }
+}