add backwards compatibility for mods using now-unused dependencies

build/common.targets

@@ -70,6 +70,11 @@
 
     <!-- .NET dependencies -->
     <Copy SourceFiles="$(TargetDir)\System.Management.dll" DestinationFolder="$(GamePath)\smapi-internal" Condition="$(OS) == 'Windows_NT'" />
+
+    <!-- Legacy .NET dependencies (remove in SMAPI 4.0.0) -->
+    <Copy SourceFiles="$(TargetDir)\System.Configuration.ConfigurationManager.dll" DestinationFolder="$(GamePath)\smapi-internal" />
+    <Copy SourceFiles="$(TargetDir)\System.Runtime.Caching.dll" DestinationFolder="$(GamePath)\smapi-internal" />
+    <Copy SourceFiles="$(TargetDir)\System.Security.Permissions.dll" DestinationFolder="$(GamePath)\smapi-internal" />
   </Target>
 
   <Target Name="CopyDefaultMods" Condition="'$(MSBuildProjectName)' == 'SMAPI.Mods.ConsoleCommands' OR '$(MSBuildProjectName)' == 'SMAPI.Mods.ErrorHandler' OR '$(MSBuildProjectName)' == 'SMAPI.Mods.SaveBackup'">

build/unix/prepare-install-package.sh

@@ -151,6 +151,11 @@ for folder in ${folders[@]}; do
         cp "$smapiBin/System.Management.dll" "$bundlePath/smapi-internal"
     fi
 
+    # copy legacy .NET dependencies (remove in SMAPI 4.0.0)
+    cp "$smapiBin/System.Configuration.ConfigurationManager.dll" "$bundlePath/smapi-internal"
+    cp "$smapiBin/System.Runtime.Caching.dll" "$bundlePath/smapi-internal"
+    cp "$smapiBin/System.Security.Permissions.dll" "$bundlePath/smapi-internal"
+
     # copy bundled mods
     for modName in ${bundleModNames[@]}; do
         fromPath="src/SMAPI.Mods.$modName/bin/$buildConfig/$runtime/publish"

build/windows/prepare-install-package.ps1

@@ -172,6 +172,11 @@ foreach ($folder in $folders) {
         cp "$smapiBin/System.Management.dll" "$bundlePath/smapi-internal"
     }
 
+    # copy legacy .NET dependencies (remove in SMAPI 4.0.0)
+    cp "$smapiBin/System.Configuration.ConfigurationManager.dll" "$bundlePath/smapi-internal"
+    cp "$smapiBin/System.Runtime.Caching.dll" "$bundlePath/smapi-internal"
+    cp "$smapiBin/System.Security.Permissions.dll" "$bundlePath/smapi-internal"
+
     # copy bundled mods
     foreach ($modName in $bundleModNames) {
         $fromPath = "src/SMAPI.Mods.$modName/bin/$buildConfig/$runtime/publish"

src/SMAPI.Toolkit/Framework/ModData/ModWarning.cs

@@ -35,6 +35,15 @@ namespace StardewModdingAPI.Toolkit.Framework.ModData
         AccessesFilesystem = 128,
 
         /// <summary>Uses .NET APIs for shell or process access.</summary>
-        AccessesShell = 256
+        AccessesShell = 256,
+
+        /// <summary>References the legacy <c>System.Configuration.ConfigurationManager</c> assembly and doesn't include a copy in the mod folder, so it'll break in SMAPI 4.0.0.</summary>
+        DetectedLegacyConfigurationDll = 512,
+
+        /// <summary>References the legacy <c>System.Runtime.Caching</c> assembly and doesn't include a copy in the mod folder, so it'll break in SMAPI 4.0.0.</summary>
+        DetectedLegacyCachingDll = 1024,
+
+        /// <summary>References the legacy <c>System.Security.Permissions</c> assembly and doesn't include a copy in the mod folder, so it'll break in SMAPI 4.0.0.</summary>
+        DetectedLegacyPermissionsDll = 2048
     }
 }

src/SMAPI/Framework/IModMetadata.cs

@@ -88,6 +88,10 @@ namespace StardewModdingAPI.Framework
         /// <param name="warning">The warning to set.</param>
         IModMetadata SetWarning(ModWarning warning);
 
+        /// <summary>Remove a warning flag for the mod.</summary>
+        /// <param name="warning">The warning to remove.</param>
+        IModMetadata RemoveWarning(ModWarning warning);
+
         /// <summary>Set the mod instance.</summary>
         /// <param name="mod">The mod instance to set.</param>
         /// <param name="translations">The translations for this mod (if loaded).</param>

src/SMAPI/Framework/ModLoading/AssemblyLoader.cs

@@ -163,6 +163,29 @@ namespace StardewModdingAPI.Framework.ModLoading
                 this.AssemblyDefinitionResolver.Add(assembly.Definition);
             }
 
+            // special case: clear legacy-DLL warnings if the mod bundles a copy
+            if (mod.Warnings.HasFlag(ModWarning.DetectedLegacyCachingDll))
+            {
+                if (File.Exists(Path.Combine(mod.DirectoryPath, "System.Runtime.Caching.dll")))
+                    mod.RemoveWarning(ModWarning.DetectedLegacyCachingDll);
+                else
+                {
+                    // remove duplicate warnings (System.Runtime.Caching.dll references these)
+                    mod.RemoveWarning(ModWarning.DetectedLegacyConfigurationDll);
+                    mod.RemoveWarning(ModWarning.DetectedLegacyPermissionsDll);
+                }
+            }
+            if (mod.Warnings.HasFlag(ModWarning.DetectedLegacyConfigurationDll))
+            {
+                if (File.Exists(Path.Combine(mod.DirectoryPath, "System.Configuration.ConfigurationManager.dll")))
+                    mod.RemoveWarning(ModWarning.DetectedLegacyConfigurationDll);
+            }
+            if (mod.Warnings.HasFlag(ModWarning.DetectedLegacyPermissionsDll))
+            {
+                if (File.Exists(Path.Combine(mod.DirectoryPath, "System.Security.Permissions.dll")))
+                    mod.RemoveWarning(ModWarning.DetectedLegacyPermissionsDll);
+            }
+
             // throw if incompatibilities detected
             if (!assumeCompatible && mod.Warnings.HasFlag(ModWarning.BrokenCodeLoaded))
                 throw new IncompatibleInstructionException();
@@ -429,6 +452,21 @@ namespace StardewModdingAPI.Framework.ModLoading
                     mod.SetWarning(ModWarning.AccessesShell);
                     break;
 
+                case InstructionHandleResult.DetectedLegacyCachingDll:
+                    template = $"{logPrefix}Detected reference to System.Runtime.Caching.dll, which will be removed in SMAPI 4.0.0.";
+                    mod.SetWarning(ModWarning.DetectedLegacyCachingDll);
+                    break;
+
+                case InstructionHandleResult.DetectedLegacyConfigurationDll:
+                    template = $"{logPrefix}Detected reference to System.Configuration.ConfigurationManager.dll, which will be removed in SMAPI 4.0.0.";
+                    mod.SetWarning(ModWarning.DetectedLegacyConfigurationDll);
+                    break;
+
+                case InstructionHandleResult.DetectedLegacyPermissionsDll:
+                    template = $"{logPrefix}Detected reference to System.Security.Permissions.dll, which will be removed in SMAPI 4.0.0.";
+                    mod.SetWarning(ModWarning.DetectedLegacyPermissionsDll);
+                    break;
+
                 case InstructionHandleResult.None:
                     break;
 

src/SMAPI/Framework/ModLoading/Finders/LegacyAssemblyFinder.cs

@@ -0,0 +1,49 @@
+using Mono.Cecil;
+using StardewModdingAPI.Framework.ModLoading.Framework;
+
+namespace StardewModdingAPI.Framework.ModLoading.Finders
+{
+    /// <summary>Detects assembly references which will break in SMAPI 4.0.0.</summary>
+    internal class LegacyAssemblyFinder : BaseInstructionHandler
+    {
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        public LegacyAssemblyFinder()
+            : base(defaultPhrase: "legacy assembly references") { }
+
+
+        /// <inheritdoc />
+        public override bool Handle(ModuleDefinition module)
+        {
+            foreach (AssemblyNameReference assembly in module.AssemblyReferences)
+            {
+                InstructionHandleResult flag = this.GetFlag(assembly);
+                if (flag is InstructionHandleResult.None)
+                    continue;
+
+                this.MarkFlag(flag);
+            }
+
+            return false;
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>Get the instruction handle flag for the given assembly reference, if any.</summary>
+        /// <param name="assemblyRef">The assembly reference.</param>
+        private InstructionHandleResult GetFlag(AssemblyNameReference assemblyRef)
+        {
+            return assemblyRef.Name switch
+            {
+                "System.Configuration.ConfigurationManager" => InstructionHandleResult.DetectedLegacyConfigurationDll,
+                "System.Runtime.Caching" => InstructionHandleResult.DetectedLegacyCachingDll,
+                "System.Security.Permission" => InstructionHandleResult.DetectedLegacyPermissionsDll,
+                _ => InstructionHandleResult.None
+            };
+        }
+    }
+}

src/SMAPI/Framework/ModLoading/InstructionHandleResult.cs

@@ -30,6 +30,15 @@ namespace StardewModdingAPI.Framework.ModLoading
         DetectedFilesystemAccess,
 
         /// <summary>The instruction accesses the OS shell or processes directly.</summary>
-        DetectedShellAccess
+        DetectedShellAccess,
+
+        /// <summary>The module references the legacy <c>System.Configuration.ConfigurationManager</c> assembly and doesn't include a copy in the mod folder, so it'll break in SMAPI 4.0.0.</summary>
+        DetectedLegacyConfigurationDll,
+
+        /// <summary>The module references the legacy <c>System.Runtime.Caching</c> assembly and doesn't include a copy in the mod folder, so it'll break in SMAPI 4.0.0.</summary>
+        DetectedLegacyCachingDll,
+
+        /// <summary>The module references the legacy <c>System.Security.Permissions</c> assembly and doesn't include a copy in the mod folder, so it'll break in SMAPI 4.0.0.</summary>
+        DetectedLegacyPermissionsDll
     }
 }

src/SMAPI/Framework/ModLoading/ModMetadata.cs

@@ -138,6 +138,13 @@ namespace StardewModdingAPI.Framework.ModLoading
             return this;
         }
 
+        /// <inheritdoc />
+        public IModMetadata RemoveWarning(ModWarning warning)
+        {
+            this.ActualWarnings &= ~warning;
+            return this;
+        }
+
         /// <inheritdoc />
         public IModMetadata SetMod(IMod mod, TranslationHelper translations)
         {

src/SMAPI/Framework/SCore.cs

@@ -1679,6 +1679,31 @@ namespace StardewModdingAPI.Framework
                 }
 #pragma warning restore CS0612, CS0618
 
+                // log deprecation warnings
+                if (metadata.HasWarnings(ModWarning.DetectedLegacyCachingDll, ModWarning.DetectedLegacyConfigurationDll, ModWarning.DetectedLegacyPermissionsDll))
+                {
+                    string?[] referenced =
+                        new[]
+                        {
+                            metadata.Warnings.HasFlag(ModWarning.DetectedLegacyConfigurationDll) ? "System.Configuration.ConfigurationManager" : null,
+                            metadata.Warnings.HasFlag(ModWarning.DetectedLegacyCachingDll) ? "System.Runtime.Caching" : null,
+                            metadata.Warnings.HasFlag(ModWarning.DetectedLegacyPermissionsDll) ? "System.Security.Permissions" : null
+                        }
+                        .Where(p => p is not null)
+                        .ToArray();
+
+                    foreach (string? name in referenced)
+                    {
+                        DeprecationManager.Warn(
+                            metadata,
+                            $"using {name} without bundling it",
+                            "3.14.7",
+                            DeprecationLevel.Notice,
+                            logStackTrace: false
+                        );
+                    }
+                }
+
                 // call entry method
                 Context.HeuristicModsRunningCode.Push(metadata);
                 try

src/SMAPI/Metadata/InstructionMetadata.cs

@@ -53,6 +53,9 @@ namespace StardewModdingAPI.Metadata
 
                 // detect Harmony & rewrite for SMAPI 3.12 (Harmony 1.x => 2.0 update)
                 yield return new HarmonyRewriter();
+
+                // detect issues for SMAPI 4.0.0
+                yield return new LegacyAssemblyFinder();
             }
             else
                 yield return new HarmonyRewriter(shouldRewrite: false);

src/SMAPI/SMAPI.csproj

@@ -28,6 +28,9 @@
     <PackageReference Include="Pintail" Version="2.1.0" />
     <PackageReference Include="Platonymous.TMXTile" Version="1.5.9" />
     <PackageReference Include="System.Reflection.Emit" Version="4.7.0" />
+
+    <!-- legacy package; remove in SMAPI 4.0.0 -->
+    <PackageReference Include="System.Runtime.Caching" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup>