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| 1 | +using Mono.Cecil; |
| 2 | +using System; |
| 3 | +using System.Collections.Generic; |
| 4 | +using System.IO; |
| 5 | +using System.Linq; |
| 6 | +using System.Reflection; |
| 7 | + |
| 8 | +namespace avaness.PluginLoader |
| 9 | +{ |
| 10 | + public class AssemblyResolver |
| 11 | + { |
| 12 | + private readonly HashSet<string> allowedAssemblyNames = new HashSet<string>(); |
| 13 | + private readonly HashSet<string> allowedAssemblyFiles = new HashSet<string>(); |
| 14 | + private readonly List<string> sourceFolders = new List<string>(); |
| 15 | + private readonly Dictionary<string, string> assemblies = new Dictionary<string, string>(); |
| 16 | + private bool enabled; |
| 17 | + |
| 18 | + public event Action<string> AssemblyResolved; |
| 19 | + |
| 20 | + public AssemblyResolver() |
| 21 | + { |
| 22 | + |
| 23 | + } |
| 24 | + |
| 25 | + /// <summary> |
| 26 | + /// Adds an assembly to the list of assemblies that are allowed to request from this resolver. |
| 27 | + /// </summary> |
| 28 | + public void AddAllowedAssemblyName(string assemblyName) |
| 29 | + { |
| 30 | + allowedAssemblyNames.Add(assemblyName); |
| 31 | + } |
| 32 | + |
| 33 | + /// <summary> |
| 34 | + /// Adds an assembly to the list of assemblies that are allowed to request from this resolver. |
| 35 | + /// </summary> |
| 36 | + public void AddAllowedAssemblyFile(string assemblyFile) |
| 37 | + { |
| 38 | + allowedAssemblyFiles.Add(Path.GetFullPath(assemblyFile)); |
| 39 | + } |
| 40 | + |
| 41 | + /// <summary> |
| 42 | + /// Adds a folder of assemblies to resolve. |
| 43 | + /// </summary> |
| 44 | + public void AddSourceFolder(string folder, SearchOption fileSearch = SearchOption.TopDirectoryOnly) |
| 45 | + { |
| 46 | + if (!Directory.Exists(folder)) |
| 47 | + return; |
| 48 | + |
| 49 | + sourceFolders.Add(Path.GetFullPath(folder)); |
| 50 | + foreach (string name in Directory.EnumerateFiles(folder, "*.dll", fileSearch)) |
| 51 | + { |
| 52 | + if (!Path.GetExtension(name).Equals(".dll", StringComparison.OrdinalIgnoreCase)) |
| 53 | + continue; |
| 54 | + string assemblyName = Path.GetFileNameWithoutExtension(name); |
| 55 | + if (!assemblies.ContainsKey(assemblyName)) |
| 56 | + { |
| 57 | + assemblies.Add(assemblyName, name); |
| 58 | + if(!enabled) |
| 59 | + { |
| 60 | + AppDomain.CurrentDomain.AssemblyResolve += Resolve; |
| 61 | + enabled = true; |
| 62 | + } |
| 63 | + } |
| 64 | + } |
| 65 | + } |
| 66 | + |
| 67 | + private Assembly Resolve(object sender, ResolveEventArgs args) |
| 68 | + { |
| 69 | + if (!IsAllowedRequest(args.RequestingAssembly)) |
| 70 | + return null; |
| 71 | + |
| 72 | + AssemblyName targetAssembly = new AssemblyName(args.Name); |
| 73 | + if (assemblies.TryGetValue(targetAssembly.Name, out string targetPath) && File.Exists(targetPath)) |
| 74 | + { |
| 75 | + Assembly a = Assembly.LoadFile(targetPath); |
| 76 | + if (AssemblyResolved != null) |
| 77 | + AssemblyResolved.Invoke(targetPath); |
| 78 | + LogFile.WriteLine($"Resolved {targetAssembly} as {a.GetName()} for {args.RequestingAssembly.GetName()}"); |
| 79 | + return a; |
| 80 | + } |
| 81 | + return null; |
| 82 | + } |
| 83 | + |
| 84 | + private bool IsAllowedRequest(Assembly requestingAssembly) |
| 85 | + { |
| 86 | + if (requestingAssembly == null) |
| 87 | + return false; |
| 88 | + |
| 89 | + string name = requestingAssembly.GetName().Name; |
| 90 | + |
| 91 | + if (string.IsNullOrWhiteSpace(requestingAssembly.Location)) |
| 92 | + return allowedAssemblyNames.Contains(name); |
| 93 | + |
| 94 | + string location = Path.GetFullPath(requestingAssembly.Location); |
| 95 | + |
| 96 | + if (allowedAssemblyFiles.Contains(location)) |
| 97 | + return true; |
| 98 | + |
| 99 | + if (sourceFolders.Any(x => location.StartsWith(x, StringComparison.OrdinalIgnoreCase))) |
| 100 | + return true; |
| 101 | + |
| 102 | + return allowedAssemblyNames.Contains(name); |
| 103 | + } |
| 104 | + } |
| 105 | +} |
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