Xpl0itR
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protodec
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Add an option to skip parsing properties that aren't decorated with the protoc attribute 

also update to dotnet 8 and update the project folder structure
This commit is contained in:
Xpl0itR 2023-12-25 01:58:12 +00:00
parent b1eed86d6c
commit e41df439ea
Signed by: Xpl0itR
GPG Key ID: 91798184109676AD
11 changed files with 42 additions and 35 deletions
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1
README.md
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@ -12,6 +12,7 @@ Arguments:
target_assembly_name The name of an assembly to parse. If omitted, all assemblies in the target_assembly_dir will be parsed.
Options:
--skip_enums Skip parsing enums and replace references to them with int32.
--skip_properties_without_protoc_attribute Skip properties that aren't decorated with `GeneratedCode("protoc")` when parsing
```
Limitations

4
protodec.sln
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@ -3,9 +3,9 @@ Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.6.33513.286
MinimumVisualStudioVersion = 10.0.40219.1
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "protodec", "protodec\protodec.csproj", "{A5493BF4-F78C-4DCF-B449-D9A9A52FB5F0}"
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "protodec", "src\protodec\protodec.csproj", "{A5493BF4-F78C-4DCF-B449-D9A9A52FB5F0}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LibProtodec", "LibProtodec\LibProtodec.csproj", "{5F6DAD82-D9AD-4CE5-86E6-D20C9F059A4D}"
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LibProtodec", "src\LibProtodec\LibProtodec.csproj", "{5F6DAD82-D9AD-4CE5-86E6-D20C9F059A4D}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution

0
LibProtodec/AssemblyInspector.cs → src/LibProtodec/AssemblyInspector.cs
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4
LibProtodec/Enum.cs → src/LibProtodec/Enum.cs
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@ -5,7 +5,7 @@ namespace LibProtodec;
public sealed class Enum : Protobuf
{
public readonly List<KeyValuePair<int, string>> Fields = new();
public readonly List<KeyValuePair<int, string>> Fields = [];
public override void WriteFileTo(IndentedTextWriter writer)
{
@ -22,7 +22,7 @@ public sealed class Enum : Protobuf
if (Fields.ContainsDuplicateKey())
{
writer.WriteLine("""option allow_alias = true;""");
writer.WriteLine("option allow_alias = true;");
}
foreach ((int id, string name) in Fields)

0
LibProtodec/Extensions.cs → src/LibProtodec/Extensions.cs
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9
LibProtodec/LibProtodec.csproj → src/LibProtodec/LibProtodec.csproj
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@ -2,24 +2,25 @@
<PropertyGroup>
<Authors>Xpl0itR</Authors>
<BaseOutputPath>$(SolutionDir)bin/$(MSBuildProjectName)</BaseOutputPath>
<Copyright>Copyright © 2023 Xpl0itR</Copyright>
<Description>A library to decompile protobuf parser/serializer classes compiled by protoc, from dotnet assemblies back into .proto definitions</Description>
<IncludeSymbols>true</IncludeSymbols>
<IsPackable>true</IsPackable>
<LangVersion>11</LangVersion>
<LangVersion>Latest</LangVersion>
<Nullable>enable</Nullable>
<OutputType>Library</OutputType>
<PackageLicenseExpression>MPL-2.0</PackageLicenseExpression>
<PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
<PublishRepositoryUrl>true</PublishRepositoryUrl>
<SymbolPackageFormat>snupkg</SymbolPackageFormat>
<TargetFramework>net7.0</TargetFramework>
<TargetFramework>net8.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="CommunityToolkit.Diagnostics" Version="8.2.2" />
<PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
<PackageReference Include="System.Reflection.MetadataLoadContext" Version="7.0.0" />
<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
<PackageReference Include="System.Reflection.MetadataLoadContext" Version="8.0.0" />
</ItemGroup>
</Project>

8
LibProtodec/Message.cs → src/LibProtodec/Message.cs
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@ -7,10 +7,10 @@ namespace LibProtodec;
public sealed class Message : Protobuf
{
public readonly HashSet<string> Imports = new();
public readonly Dictionary<string, int[]> OneOfs = new();
public readonly Dictionary<int, (bool IsOptional, string Type, string Name)> Fields = new();
public readonly Dictionary<string, Protobuf> Nested = new();
public readonly HashSet<string> Imports = [];
public readonly Dictionary<string, int[]> OneOfs = [];
public readonly Dictionary<int, (bool IsOptional, string Type, string Name)> Fields = [];
public readonly Dictionary<string, Protobuf> Nested = [];
public override void WriteFileTo(IndentedTextWriter writer)
{

0
LibProtodec/Protobuf.cs → src/LibProtodec/Protobuf.cs
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38
LibProtodec/Protodec.cs → src/LibProtodec/Protodec.cs
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@ -12,14 +12,8 @@ public sealed class Protodec
{
public delegate bool LookupFunc(string key, [MaybeNullWhen(false)] out string value);
private readonly Dictionary<string, Protobuf> _protobufs;
private readonly HashSet<string> _currentDescent;
public Protodec()
{
_protobufs = new Dictionary<string, Protobuf>();
_currentDescent = new HashSet<string>();
}
private readonly Dictionary<string, Protobuf> _protobufs = [];
private readonly HashSet<string> _currentDescent = [];
public LookupFunc? CustomTypeLookup { get; init; }
@ -40,11 +34,11 @@ public sealed class Protodec
}
}
public void ParseMessage(Type type, bool skipEnums = false)
public void ParseMessage(Type type, bool skipEnums = false, bool skipPropertiesWithoutProtocAttribute = false)
{
Guard.IsTrue(type.IsClass);
ParseMessageInternal(type, skipEnums, null);
ParseMessageInternal(type, skipEnums, skipPropertiesWithoutProtocAttribute, null);
_currentDescent.Clear();
}
@ -66,7 +60,7 @@ public sealed class Protodec
|| !_currentDescent.Add(type.Name);
}
private void ParseMessageInternal(Type messageClass, bool skipEnums, Message? parentMessage)
private void ParseMessageInternal(Type messageClass, bool skipEnums, bool skipPropertiesWithoutProtocAttribute, Message? parentMessage)
{
if (IsParsed(messageClass, parentMessage, out Dictionary<string, Protobuf> protobufs))
{
@ -87,7 +81,9 @@ public sealed class Protodec
{
PropertyInfo property = properties[pi];
if (property.GetMethod is null || property.GetMethod.IsVirtual)
if (property.GetMethod is null
|| property.GetMethod.IsVirtual
|| (skipPropertiesWithoutProtocAttribute && !HasProtocAttribute(property)))
{
fi--;
continue;
@ -116,7 +112,7 @@ public sealed class Protodec
int msgFieldId = (int)idField.GetRawConstantValue()!;
bool msgFieldIsOptional = false;
string msgFieldType = ParseFieldType(propertyType, skipEnums, message);
string msgFieldType = ParseFieldType(propertyType, skipEnums, skipPropertiesWithoutProtocAttribute, message);
string msgFieldName = TranslateMessageFieldName(property.Name);
// optional protobuf fields will generate an additional "Has" get-only boolean property immediately after the real property
@ -157,7 +153,7 @@ public sealed class Protodec
protobufs.Add(@enum.Name, @enum);
}
private string ParseFieldType(Type type, bool skipEnums, Message message)
private string ParseFieldType(Type type, bool skipEnums, bool skipPropertiesWithoutProtocAttribute, Message message)
{
switch (type.Name)
{
@ -184,11 +180,11 @@ public sealed class Protodec
switch (type.GenericTypeArguments.Length)
{
case 1:
string t = ParseFieldType(type.GenericTypeArguments[0], skipEnums, message);
string t = ParseFieldType(type.GenericTypeArguments[0], skipEnums, skipPropertiesWithoutProtocAttribute, message);
return "repeated " + t;
case 2:
string t1 = ParseFieldType(type.GenericTypeArguments[0], skipEnums, message);
string t2 = ParseFieldType(type.GenericTypeArguments[1], skipEnums, message);
string t1 = ParseFieldType(type.GenericTypeArguments[0], skipEnums, skipPropertiesWithoutProtocAttribute, message);
string t2 = ParseFieldType(type.GenericTypeArguments[1], skipEnums, skipPropertiesWithoutProtocAttribute, message);
return $"map<{t1}, {t2}>";
}
@ -208,7 +204,7 @@ public sealed class Protodec
}
else
{
ParseMessageInternal(type, skipEnums, message);
ParseMessageInternal(type, skipEnums, skipPropertiesWithoutProtocAttribute, message);
}
if (!type.IsNested)
@ -219,6 +215,12 @@ public sealed class Protodec
return type.Name;
}
private static bool HasProtocAttribute(PropertyInfo property) =>
property.GetCustomAttributesData()
.Any(attr =>
attr.AttributeType.Name == "GeneratedCodeAttribute"
&& attr.ConstructorArguments[0].Value as string == "protoc");
private string TranslateProtobufName(string name) =>
CustomNameLookup?.Invoke(name, out string? translatedName) == true
? translatedName

4
protodec/Program.cs → src/protodec/Program.cs
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@ -13,6 +13,7 @@ const string help = """
target_assembly_name The name of an assembly to parse. If omitted, all assemblies in the target_assembly_dir will be parsed.
Options:
--skip_enums Skip parsing enums and replace references to them with int32.
--skip_properties_without_protoc_attribute Skip properties that aren't decorated with `GeneratedCode("protoc")` when parsing
""";
if (args.Length < 2)
@ -30,13 +31,14 @@ if (args.Length > 2 && !args[2].StartsWith('-'))
string assemblyDir = args[0];
string outPath = Path.GetFullPath(args[1]);
bool skipEnums = args.Contains("--skip_enums");
bool skipPropertiesWithoutProtocAttribute = args.Contains("--skip_properties_without_protoc_attribute");
using AssemblyInspector inspector = new(assemblyDir, assemblyName);
Protodec protodec = new();
foreach (Type message in inspector.GetProtobufMessageTypes())
{
protodec.ParseMessage(message, skipEnums);
protodec.ParseMessage(message, skipEnums, skipPropertiesWithoutProtocAttribute);
}
if (Directory.Exists(outPath))

5
protodec/protodec.csproj → src/protodec/protodec.csproj
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@ -1,11 +1,12 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<LangVersion>11</LangVersion>
<BaseOutputPath>$(SolutionDir)bin/$(MSBuildProjectName)</BaseOutputPath>
<LangVersion>Latest</LangVersion>
<Nullable>enable</Nullable>
<OutputType>Exe</OutputType>
<RuntimeIdentifiers>win-x64;linux-x64</RuntimeIdentifiers>
<TargetFramework>net7.0</TargetFramework>
<TargetFramework>net8.0</TargetFramework>
</PropertyGroup>
<ItemGroup>