Enable Hidi users configure CSDL to OpenAPI conversion settings

src/Microsoft.OpenApi.Hidi/Handlers/TransformCommandHandler.cs

@@ -21,6 +21,7 @@ internal class TransformCommandHandler : ICommandHandler
         public Option<string?> VersionOption { get; set; }
         public Option<OpenApiFormat?> FormatOption { get; set; }
         public Option<bool> TerseOutputOption { get; set; }
+        public Option<string> SettingsFileOption { get; set; }
         public Option<LogLevel> LogLevelOption { get; set; }
         public Option<string> FilterByOperationIdsOption { get; set; }
         public Option<string> FilterByTagsOption { get; set; }
@@ -42,6 +43,7 @@ public async Task<int> InvokeAsync(InvocationContext context)
             string? version = context.ParseResult.GetValueForOption(VersionOption);
             OpenApiFormat? format = context.ParseResult.GetValueForOption(FormatOption);
             bool terseOutput = context.ParseResult.GetValueForOption(TerseOutputOption);
+            string settingsFile = context.ParseResult.GetValueForOption(SettingsFileOption);
             LogLevel logLevel = context.ParseResult.GetValueForOption(LogLevelOption);
             bool inlineLocal = context.ParseResult.GetValueForOption(InlineLocalOption);
             bool inlineExternal = context.ParseResult.GetValueForOption(InlineExternalOption);
@@ -54,7 +56,7 @@ public async Task<int> InvokeAsync(InvocationContext context)
             var logger = loggerFactory.CreateLogger<OpenApiService>();
             try
             {
-                await OpenApiService.TransformOpenApiDocument(openapi, csdl, csdlFilter, output, cleanOutput, version, format, terseOutput, logLevel, inlineLocal, inlineExternal, filterbyoperationids, filterbytags, filterbycollection, cancellationToken);
+                await OpenApiService.TransformOpenApiDocument(openapi, csdl, csdlFilter, output, cleanOutput, version, format, terseOutput, settingsFile, logLevel, inlineLocal, inlineExternal, filterbyoperationids, filterbytags, filterbycollection, cancellationToken);
 
                 return 0;
             }

src/Microsoft.OpenApi.Hidi/Microsoft.OpenApi.Hidi.csproj

@@ -44,11 +44,20 @@
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
     <PackageReference Include="Microsoft.OData.Edm" Version="7.12.5" />
     <PackageReference Include="Microsoft.OpenApi.OData" Version="1.2.0-preview6" />
+    <PackageReference Include="System.CommandLine.Hosting" Version="0.4.0-alpha.22114.1" />
   </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\Microsoft.OpenApi.Readers\Microsoft.OpenApi.Readers.csproj" />
     <ProjectReference Include="..\Microsoft.OpenApi\Microsoft.OpenApi.csproj" />
   </ItemGroup>
 
+  <!-- Make internals available for Unit Testing -->
+  <ItemGroup>
+    <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
+      <_Parameter1>Microsoft.OpenApi.Hidi.Tests</_Parameter1>
+    </AssemblyAttribute>
+  </ItemGroup>
+    <!-- End Unit test Internals -->
+
 </Project>

src/Microsoft.OpenApi.Hidi/OpenApiService.cs

@@ -27,6 +27,8 @@
 using System.Xml.Xsl;
 using System.Xml;
 using System.Reflection;
+using Microsoft.Extensions.Configuration;
+using System.Runtime.CompilerServices;
 
 namespace Microsoft.OpenApi.Hidi
 {
@@ -44,6 +46,7 @@ public static async Task TransformOpenApiDocument(
             string? version,
             OpenApiFormat? format,
             bool terseOutput,
+            string settingsFile,
             LogLevel logLevel,
             bool inlineLocal,
             bool inlineExternal,
@@ -98,7 +101,8 @@ CancellationToken cancellationToken
                             stream = ApplyFilter(csdl, csdlFilter, transform);
                             stream.Position = 0;
                         }
-                        document = await ConvertCsdlToOpenApi(stream);
+
+                        document = await ConvertCsdlToOpenApi(stream, settingsFile);
                         stopwatch.Stop();
                         logger.LogTrace("{timestamp}ms: Generated OpenAPI with {paths} paths.", stopwatch.ElapsedMilliseconds, document.Paths.Count);
                     }
@@ -304,25 +308,37 @@ public static async Task ValidateOpenApiDocument(
             }
         }
 
+        internal static IConfiguration GetConfiguration(string settingsFile)
+        {
+            settingsFile ??= "appsettings.json";
+
+            IConfiguration config = new ConfigurationBuilder()
+            .AddJsonFile(settingsFile, true)
+            .Build();
+
+            return config;
+        }
+
         /// <summary>
         /// Converts CSDL to OpenAPI
         /// </summary>
         /// <param name="csdl">The CSDL stream.</param>
         /// <returns>An OpenAPI document.</returns>
-        public static async Task<OpenApiDocument> ConvertCsdlToOpenApi(Stream csdl)
+        public static async Task<OpenApiDocument> ConvertCsdlToOpenApi(Stream csdl, string settingsFile = null)
         {
             using var reader = new StreamReader(csdl);
             var csdlText = await reader.ReadToEndAsync();
             var edmModel = CsdlReader.Parse(XElement.Parse(csdlText).CreateReader());
-
+
+            var config = GetConfiguration(settingsFile);
             var settings = new OpenApiConvertSettings()
             {
                 AddSingleQuotesForStringParameters = true,
                 AddEnumDescriptionExtension = true,
                 DeclarePathParametersOnPathItem = true,
                 EnableKeyAsSegment = true,
                 EnableOperationId = true,
-                ErrorResponsesAsDefault  = false,
+                ErrorResponsesAsDefault = false,
                 PrefixEntityTypeNameBeforeKey = true,
                 TagDepth = 2,
                 EnablePagination = true,
@@ -335,6 +351,8 @@ public static async Task<OpenApiDocument> ConvertCsdlToOpenApi(Stream csdl)
                 EnableCount = true,
                 UseSuccessStatusCodeRange = true
             };
+            config.GetSection("OpenApiConvertSettings").Bind(settings);
+
             OpenApiDocument document = edmModel.ConvertToOpenApi(settings);
 
             document = FixReferences(document);

src/Microsoft.OpenApi.Hidi/Program.cs

@@ -2,8 +2,14 @@
 // Licensed under the MIT license.
 
 using System.CommandLine;
+using System.CommandLine.Builder;
+using System.CommandLine.Hosting;
+using System.CommandLine.Parsing;
+
 using System.IO;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Microsoft.OpenApi.Hidi.Handlers;
 
@@ -41,6 +47,9 @@ static async Task Main(string[] args)
             var terseOutputOption = new Option<bool>("--terse-output", "Produce terse json output");
             terseOutputOption.AddAlias("--to");
 
+            var settingsFileOption = new Option<string>("--settings-path", "The configuration file with CSDL conversion settings.");
+            settingsFileOption.AddAlias("--sp");
+
             var logLevelOption = new Option<LogLevel>("--log-level", () => LogLevel.Information, "The log level to use when logging messages to the main output.");
             logLevelOption.AddAlias("--ll");
 
@@ -81,6 +90,7 @@ static async Task Main(string[] args)
                 versionOption,
                 formatOption,
                 terseOutputOption,
+                settingsFileOption,
                 logLevelOption,               
                 filterByOperationIdsOption,
                 filterByTagsOption,
@@ -99,6 +109,7 @@ static async Task Main(string[] args)
                 VersionOption = versionOption,
                 FormatOption = formatOption,
                 TerseOutputOption = terseOutputOption,
+                SettingsFileOption = settingsFileOption,
                 LogLevelOption = logLevelOption,
                 FilterByOperationIdsOption = filterByOperationIdsOption,
                 FilterByTagsOption = filterByTagsOption,

test/Microsoft.OpenApi.Hidi.Tests/Microsoft.OpenApi.Hidi.Tests.csproj

@@ -34,6 +34,9 @@
   </ItemGroup>
 
   <ItemGroup>
+    <None Update="UtilityFiles\appsettingstest.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
     <None Update="UtilityFiles\postmanCollection_ver1.json">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>

test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiServiceTests.cs

@@ -1,10 +1,9 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
-using System;
-using System.IO;
-using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
 using Microsoft.OpenApi.Hidi;
+using Microsoft.OpenApi.OData;
 using Microsoft.OpenApi.Services;
 using Xunit;
 
@@ -51,5 +50,26 @@ public async Task ReturnFilteredOpenApiDocBasedOnOperationIdsAndInputCsdlDocumen
             Assert.NotEmpty(subsetOpenApiDocument.Paths);
             Assert.Equal(expectedPathCount, subsetOpenApiDocument.Paths.Count);
         }
+
+        [Theory]
+        [InlineData("UtilityFiles/appsettingstest.json")]
+        [InlineData(null)]
+        public void ReturnOpenApiConvertSettingsWhenSettingsFileIsProvided(string filePath)
+        {
+            // Arrange
+            var config = OpenApiService.GetConfiguration(filePath);
+
+            // Act and Assert
+            var settings = config.GetSection("OpenApiConvertSettings").Get<OpenApiConvertSettings>();
+
+            if (filePath == null)
+            {
+                Assert.Null(settings);
+            }
+            else
+            {
+                Assert.NotNull(settings);
+            }
+        }
     }
 }

test/Microsoft.OpenApi.Hidi.Tests/UtilityFiles/appsettingstest.json

@@ -0,0 +1,21 @@
+{
+  "OpenApiConvertSettings": {
+    "AddSingleQuotesForStringParameters": "true",
+    "AddEnumDescriptionExtension": "true",
+    "DeclarePathParametersOnPathItem": "true",
+    "EnableKeyAsSegment": "true",
+    "EnableOperationId": "true",
+    "ErrorResponsesAsDefault": "false",
+    "PrefixEntityTypeNameBeforeKey": "true",
+    "TagDepth": 2,
+    "EnablePagination": "true",
+    "EnableDiscriminatorValue": "true",
+    "EnableDerivedTypesReferencesForRequestBody": "false",
+    "EnableDerivedTypesReferencesForResponses": "false",
+    "ShowRootPath": "false",
+    "ShowLinks": "false",
+    "ExpandDerivedTypesNavigationProperties": "false",
+    "EnableCount": "true",
+    "UseSuccessStatusCodeRange": "true"
+  }
+}