Use MSBuild to find target framework

.autover/changes/8a5204e4-83ec-45ac-8c75-27512ae9cdf8.json

@@ -0,0 +1,12 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.Tools",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Update logic for finding project properties to use MSBuild instead of parsing the project file directly. See https://learn.microsoft.com/en-us/visualstudio/msbuild/customize-your-build?view=vs-2022 for more details.",
+        "Fix 'SelfContained' property reading logic to actually read the value from the properties. Previously we were only checking that the value could be parsed and not reading the actual value."
+      ]
+    }
+  ]
+}

aws-extensions-for-dotnet-cli.sln

@@ -67,6 +67,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TestNativeAotNet8WebApp", "
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TestIntegerFunction", "testapps\TestIntegerFunction\TestIntegerFunction.csproj", "{D7F1DFA4-066B-469C-B04C-DF032CF152C1}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TestFunctionBuildProps", "testapps\TestFunctionBuildProps\TestFunctionBuildProps\TestFunctionBuildProps.csproj", "{AFA71B8E-F0AA-4704-8C4E-C11130F82B13}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -169,6 +171,10 @@ Global
 		{D7F1DFA4-066B-469C-B04C-DF032CF152C1}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D7F1DFA4-066B-469C-B04C-DF032CF152C1}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{D7F1DFA4-066B-469C-B04C-DF032CF152C1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{AFA71B8E-F0AA-4704-8C4E-C11130F82B13}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AFA71B8E-F0AA-4704-8C4E-C11130F82B13}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AFA71B8E-F0AA-4704-8C4E-C11130F82B13}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AFA71B8E-F0AA-4704-8C4E-C11130F82B13}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -200,6 +206,7 @@ Global
 		{AD31D053-97C5-4262-B187-EC42BFD51A9F} = {BB3CF729-8213-4DDD-85AE-A5E7754F3944}
 		{69FFA03C-D29F-40E0-9E7F-572D5E10AF77} = {BB3CF729-8213-4DDD-85AE-A5E7754F3944}
 		{D7F1DFA4-066B-469C-B04C-DF032CF152C1} = {BB3CF729-8213-4DDD-85AE-A5E7754F3944}
+		{AFA71B8E-F0AA-4704-8C4E-C11130F82B13} = {BB3CF729-8213-4DDD-85AE-A5E7754F3944}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {DBFC70D6-49A2-40A1-AB08-5D9504AB7112}

src/Amazon.Common.DotNetCli.Tools/Utilities.cs

@@ -18,6 +18,7 @@
 using System.Text.RegularExpressions;
 using System.Collections;
 using System.Xml;
+using System.Text.Json;
 
 namespace Amazon.Common.DotNetCli.Tools
 {
@@ -205,72 +206,136 @@ public static string DeterminePublishLocation(string workingDirectory, string pr
             return path;
         }
 
-        public static string LookupTargetFrameworkFromProjectFile(string projectLocation)
-        {
-            var projectFile = FindProjectFileInDirectory(projectLocation);
 
-            var xdoc = XDocument.Load(projectFile);
-
-            var element = xdoc.XPathSelectElement("//PropertyGroup/TargetFramework");
-            return element?.Value;
-        }
-
-        /// <summary>
-        /// Retrieve the `OutputType` property of a given project
+        // <summary>
+        /// Looks up specified properties from a project.
         /// </summary>
-        /// <param name="projectLocation">Path of the project</param>
-        /// <returns>The value of the `OutputType` property</returns>
-        public static string LookupOutputTypeFromProjectFile(string projectLocation)
+        /// <param name="projectLocation">The location of the project file.</param>
+        /// <param name="propertyNames">The names of the properties to look up.</param>
+        /// <returns>A dictionary of property names and their values.</returns>        
+        public static Dictionary<string, string> LookupProjectProperties(string projectLocation, params string[] propertyNames)
         {
-            var process = new Process();
-            var output = string.Empty;
-            var msbuildProcessFailed = false;
-            try
+            var projectFile = FindProjectFileInDirectory(projectLocation);
+            var properties = new Dictionary<string, string>();
+            var arguments = new List<string>
             {
-                process.StartInfo = new ProcessStartInfo()
+                "msbuild",
+                projectFile,
+                "-nologo",
+                $"--getProperty:{string.Join(',', propertyNames)}"
+            };
+
+            var process = new Process
+            {
+                StartInfo = new ProcessStartInfo
                 {
                     FileName = "dotnet",
-                    Arguments = $"msbuild {projectLocation} -getProperty:OutputType",
+                    Arguments = string.Join(" ", arguments),
                     RedirectStandardOutput = true,
+                    RedirectStandardError = true,
                     UseShellExecute = false,
-                    WindowStyle = ProcessWindowStyle.Hidden
-                };
-
+                    CreateNoWindow = true
+                }
+            };
+            try
+            {
                 process.Start();
-                output = process.StandardOutput.ReadToEnd();
-                var hasExited = process.WaitForExit(5000);
+                string output = process.StandardOutput.ReadToEnd().Trim();
+                string error = process.StandardError.ReadToEnd();
+                process.WaitForExit(5000);
 
-                // If it hasn't completed in the specified timeout, stop the process and give up
-                if (!hasExited) 
+                if (process.ExitCode == 0)
                 {
-                    process.Kill();
-                    msbuildProcessFailed = true;
+                    if (propertyNames.Length == 1)
+                    {
+                        // If only one property was requested, the output is the direct value
+                        properties[propertyNames[0]] = output;
+                    }
+                    else
+                    {
+                        // Multiple properties were requested, so we expect JSON output
+                        using JsonDocument doc = JsonDocument.Parse(output);
+                        JsonElement root = doc.RootElement;
+                        JsonElement propertiesElement = root.GetProperty("Properties");
+
+                        foreach (var property in propertyNames)
+                        {
+                            if (propertiesElement.TryGetProperty(property, out JsonElement propertyValue))
+                            {
+                                properties[property] = propertyValue.GetString();
+                            }
+                        }
+                    }
                 }
-
-                // If it has completed but unsuccessfully, give up
-                if (process.ExitCode != 0)
+                else
                 {
-                    msbuildProcessFailed = true;
+                    // Fallback to XML parsing
+                    properties = LookupProjectPropertiesFromXml(projectFile, propertyNames);
                 }
             }
             catch (Exception)
             {
-                // swallow any exceptions related to `dotnet msbuild`
-                msbuildProcessFailed = true;
+                // Fallback to XML parsing
+                properties = LookupProjectPropertiesFromXml(projectFile, propertyNames);
             }
 
-            if (msbuildProcessFailed)
+            return properties;
+        }
+
+
+        private static Dictionary<string, string> LookupProjectPropertiesFromXml(string projectFile, string[] propertyNames)
+        {
+            var properties = new Dictionary<string, string>();
+            try
             {
-                var projectFile = FindProjectFileInDirectory(projectLocation);
                 var xdoc = XDocument.Load(projectFile);
-                var element = xdoc.XPathSelectElement("//PropertyGroup/OutputType");
-                output = element?.Value;
+                foreach (var propertyName in propertyNames)
+                {
+                    var element = xdoc.XPathSelectElement($"//PropertyGroup/{propertyName}");
+                    if (element != null && !string.IsNullOrWhiteSpace(element.Value))
+                    {
+                        properties[propertyName] = element.Value;
+                    }
+                }
+            }
+            catch (Exception)
+            {
+            }
+            return properties;
+        }                                   
+
+        /// <summary>
+        /// Looks up the target framework from a project file.
+        /// </summary>
+        /// <param name="projectLocation">The location of the project file.</param>
+        /// <returns>The target framework of the project.</returns>
+        public static string LookupTargetFrameworkFromProjectFile(string projectLocation)
+        {
+            var properties = LookupProjectProperties(projectLocation, "TargetFramework", "TargetFrameworks");
+            if (properties.TryGetValue("TargetFramework", out var targetFramework) && !string.IsNullOrEmpty(targetFramework))
+            {
+                return targetFramework;
             }
+            if (properties.TryGetValue("TargetFrameworks", out var targetFrameworks) && !string.IsNullOrEmpty(targetFrameworks))
+            {
+                var frameworks = targetFrameworks.Split(';');
+                if (frameworks.Length > 1 ){
+                    return null;
+                }
+                return frameworks[0];
+            }
+            return null;
+        }
 
-            return 
-                string.IsNullOrEmpty(output) ? 
-                    null : 
-                    output.Trim();
+        /// <summary>
+        /// Retrieve the `OutputType` property of a given project
+        /// </summary>
+        /// <param name="projectLocation">Path of the project</param>
+        /// <returns>The value of the `OutputType` property</returns>
+        public static string LookupOutputTypeFromProjectFile(string projectLocation)
+        {
+            var properties = LookupProjectProperties(projectLocation, "OutputType");
+            return properties.TryGetValue("OutputType", out var outputType) ? outputType.Trim() : null;
         }
 
         public static bool LookPublishAotFlag(string projectLocation, string msBuildParameters)
@@ -288,43 +353,32 @@ public static bool LookPublishAotFlag(string projectLocation, string msBuildPara
                 }
             }
 
-            // If the property wasn't provided in msBuildParameters, fall back to searching project file
-            var projectFile = FindProjectFileInDirectory(projectLocation);
-
-            var xdoc = XDocument.Load(projectFile);
-
-            var element = xdoc.XPathSelectElement("//PropertyGroup/PublishAot");
-
-            if (bool.TryParse(element?.Value, out bool result))
+            var properties = LookupProjectProperties(projectLocation, "PublishAot");
+            if (properties.TryGetValue("PublishAot", out var publishAot))
             {
-                return result;
+                return bool.TryParse(publishAot, out var result) && result;
             }
-
             return false;
         }
+
+
         public static bool HasExplicitSelfContainedFlag(string projectLocation, string msBuildParameters)
         {
             if (msBuildParameters != null && msBuildParameters.IndexOf("--self-contained", StringComparison.InvariantCultureIgnoreCase) != -1)
             {
                 return true;
             }
 
-            // If the property wasn't provided in msBuildParameters, fall back to searching project file
-            var projectFile = FindProjectFileInDirectory(projectLocation);
-
-            var xdoc = XDocument.Load(projectFile);
-
-            var element = xdoc.XPathSelectElement("//PropertyGroup/SelfContained");
-
-            if (bool.TryParse(element?.Value, out _))
+            var properties = LookupProjectProperties(projectLocation, "SelfContained");
+            if (properties.TryGetValue("SelfContained", out var selfContained))
             {
-                return true;
+                return bool.TryParse(selfContained, out var isSelfContained) && isSelfContained;
             }
 
             return false;
         }
 
-        public static string FindProjectFileInDirectory(string directory)
+        private static string FindProjectFileInDirectory(string directory)
         {
             if (File.Exists(directory))
                 return directory;

test/Amazon.Common.DotNetCli.Tools.Test/UtilitiesTests.cs

@@ -13,6 +13,7 @@ public class UtilitiesTests
         [InlineData("../../../../../testapps/TestFunction", "net6.0")]
         [InlineData("../../../../../testapps/ServerlessWithYamlFunction", "net6.0")]
         [InlineData("../../../../../testapps/TestBeanstalkWebApp", "netcoreapp3.1")]
+        [InlineData("../../../../../testapps/TestFunctionBuildProps/TestFunctionBuildProps", "net6.0")]
         public void CheckFramework(string projectPath, string expectedFramework)
         {
             var assembly = this.GetType().GetTypeInfo().Assembly;

testapps/TestFunctionBuildProps/Directory.Build.props

@@ -0,0 +1,5 @@
+<Project>
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+  </PropertyGroup>
+</Project>

testapps/TestFunctionBuildProps/TestFunctionBuildProps/Function.cs

@@ -0,0 +1,14 @@
+using Amazon.Lambda.Core;
+
+// Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class.
+[assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer))]
+
+namespace TestFunctionBuildProps;
+
+public class Function
+{
+    public string FunctionHandler(string input, ILambdaContext context)
+    {
+        return input.ToUpper();
+    }
+}

testapps/TestFunctionBuildProps/TestFunctionBuildProps/TestFunctionBuildProps.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
+    <AWSProjectType>Lambda</AWSProjectType>
+    <!-- This property makes the build directory similar to a publish directory and helps the AWS .NET Lambda Mock Test Tool find project dependencies. -->
+    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
+    <!-- Generate ready to run images during publishing to improve cold start time. -->
+    <PublishReadyToRun>true</PublishReadyToRun>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Amazon.Lambda.Core" Version="2.4.0" />
+    <PackageReference Include="Amazon.Lambda.Serialization.SystemTextJson" Version="2.4.4" />
+  </ItemGroup>
+</Project>

testapps/TestFunctionBuildProps/TestFunctionBuildProps/aws-lambda-tools-defaults.json

@@ -0,0 +1,16 @@
+{
+  "Information": [
+    "This file provides default values for the deployment wizard inside Visual Studio and the AWS Lambda commands added to the .NET Core CLI.",
+    "To learn more about the Lambda commands with the .NET Core CLI execute the following command at the command line in the project root directory.",
+    "dotnet lambda help",
+    "All the command line options for the Lambda command can be specified in this file."
+  ],
+  "profile": "default",
+  "region": "us-west-2",
+  "configuration": "Release",
+  "function-architecture": "x86_64",
+  "function-runtime": "dotnet8",
+  "function-memory-size": 512,
+  "function-timeout": 30,
+  "function-handler": "TestFunctionBuildProps::TestFunctionBuildProps.Function::FunctionHandler"
+}