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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using Mono.Cecil;
using Newtonsoft.Json;
using StardewModdingAPI.AssemblyRewriters;
using StardewModdingAPI.Framework.AssemblyRewriting;
namespace StardewModdingAPI.Framework
{
/// <summary>Preprocesses and loads mod assemblies.</summary>
internal class ModAssemblyLoader
{
/*********
** Properties
*********/
/// <summary>The name of the directory containing a mod's cached data.</summary>
private readonly string CacheDirName;
/// <summary>Metadata for mapping assemblies to the current <see cref="Platform"/>.</summary>
private readonly PlatformAssemblyMap AssemblyMap;
/// <summary>Rewrites assembly types to match the current platform.</summary>
private readonly AssemblyTypeRewriter AssemblyTypeRewriter;
/// <summary>Encapsulates monitoring and logging.</summary>
private readonly IMonitor Monitor;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="cacheDirName">The name of the directory containing a mod's cached data.</param>
/// <param name="targetPlatform">The current game platform.</param>
/// <param name="monitor">Encapsulates monitoring and logging.</param>
public ModAssemblyLoader(string cacheDirName, Platform targetPlatform, IMonitor monitor)
{
this.CacheDirName = cacheDirName;
this.Monitor = monitor;
this.AssemblyMap = Constants.GetAssemblyMap(targetPlatform);
this.AssemblyTypeRewriter = new AssemblyTypeRewriter(this.AssemblyMap, monitor);
}
/// <summary>Preprocess an assembly unless the cache is up to date.</summary>
/// <param name="assemblyPath">The assembly file path.</param>
/// <returns>Returns the rewrite metadata for the preprocessed assembly.</returns>
public RewriteResult ProcessAssemblyUnlessCached(string assemblyPath)
{
// read assembly data
byte[] assemblyBytes = File.ReadAllBytes(assemblyPath);
string hash = string.Join("", MD5.Create().ComputeHash(assemblyBytes).Select(p => p.ToString("X2")));
// get cached result if current
CachePaths cachePaths = this.GetCachePaths(assemblyPath);
{
CacheEntry cacheEntry = File.Exists(cachePaths.Metadata) ? JsonConvert.DeserializeObject<CacheEntry>(File.ReadAllText(cachePaths.Metadata)) : null;
if (cacheEntry != null && cacheEntry.IsUpToDate(cachePaths, hash, Constants.Version))
return new RewriteResult(assemblyPath, cachePaths, assemblyBytes, cacheEntry.Hash, cacheEntry.UseCachedAssembly, isNewerThanCache: false); // no rewrite needed
}
this.Monitor.Log($"Preprocessing {Path.GetFileName(assemblyPath)} for compatibility...", LogLevel.Trace);
// rewrite assembly
AssemblyDefinition assembly;
using (Stream readStream = new MemoryStream(assemblyBytes))
assembly = AssemblyDefinition.ReadAssembly(readStream);
bool modified = this.AssemblyTypeRewriter.RewriteAssembly(assembly);
using (MemoryStream outStream = new MemoryStream())
{
assembly.Write(outStream);
byte[] outBytes = outStream.ToArray();
return new RewriteResult(assemblyPath, cachePaths, outBytes, hash, useCachedAssembly: modified, isNewerThanCache: true);
}
}
/// <summary>Write rewritten assembly metadata to the cache for a mod.</summary>
/// <param name="results">The rewrite results.</param>
/// <param name="forceCacheAssemblies">Whether to write all assemblies to the cache, even if they weren't modified.</param>
/// <exception cref="InvalidOperationException">There are no results to write, or the results are not all for the same directory.</exception>
public void WriteCache(IEnumerable<RewriteResult> results, bool forceCacheAssemblies)
{
results = results.ToArray();
// get cache directory
if (!results.Any())
throw new InvalidOperationException("There are no assemblies to cache.");
if (results.Select(p => p.CachePaths.Directory).Distinct().Count() > 1)
throw new InvalidOperationException("The assemblies can't be cached together because they have different source directories.");
string cacheDir = results.Select(p => p.CachePaths.Directory).First();
// reset cache
if (Directory.Exists(cacheDir))
Directory.Delete(cacheDir, recursive: true);
Directory.CreateDirectory(cacheDir);
// cache all results
foreach (RewriteResult result in results)
{
CacheEntry cacheEntry = new CacheEntry(result.Hash, Constants.Version.ToString(), forceCacheAssemblies || result.UseCachedAssembly);
File.WriteAllText(result.CachePaths.Metadata, JsonConvert.SerializeObject(cacheEntry));
if (forceCacheAssemblies || result.UseCachedAssembly)
File.WriteAllBytes(result.CachePaths.Assembly, result.AssemblyBytes);
}
}
/// <summary>Resolve an assembly from its name.</summary>
/// <param name="name">The assembly name.</param>
/// <remarks>
/// This implementation returns the first loaded assembly which matches the short form of
/// the assembly name, to resolve assembly resolution issues when rewriting
/// assemblies (especially with Mono). Since this is meant to be called on <see cref="AppDomain.AssemblyResolve"/>,
/// the implicit assumption is that loading the exact assembly failed.
/// </remarks>
public Assembly ResolveAssembly(string name)
{
string shortName = name.Split(new[] { ',' }, 2).First(); // get simple name (without version and culture)
return AppDomain.CurrentDomain
.GetAssemblies()
.FirstOrDefault(p => p.GetName().Name == shortName);
}
/*********
** Private methods
*********/
/// <summary>Get the cache details for an assembly.</summary>
/// <param name="assemblyPath">The assembly file path.</param>
private CachePaths GetCachePaths(string assemblyPath)
{
string fileName = Path.GetFileName(assemblyPath);
string dirPath = Path.Combine(Path.GetDirectoryName(assemblyPath), this.CacheDirName);
string cacheAssemblyPath = Path.Combine(dirPath, fileName);
string metadataPath = Path.Combine(dirPath, $"{fileName}.json");
return new CachePaths(dirPath, cacheAssemblyPath, metadataPath);
}
}
}
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