Update Swashbuckle and improve generated OpenAPI files (#6066)

* Improve generated OpenAPI files

* Nullable

* Fmt

* Correct powershell command

* Fix name

* Add some tests

* Fmt

* Switch to using json naming policy

src/SharedWeb/Swagger/EncryptedStringSchemaFilter.cs

@@ -0,0 +1,40 @@
+#nullable enable
+
+using System.Text.Json;
+using Bit.Core.Utilities;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace Bit.SharedWeb.Swagger;
+
+/// <summary>
+///  Set the format of any strings that are decorated with the <see cref="EncryptedStringAttribute"/> to "x-enc-string".
+///  This will allow the generated bindings to use a more appropriate type for encrypted strings.
+/// </summary>
+public class EncryptedStringSchemaFilter : ISchemaFilter
+{
+    public void Apply(OpenApiSchema schema, SchemaFilterContext context)
+    {
+        if (context.Type == null || schema.Properties == null)
+            return;
+
+        foreach (var prop in context.Type.GetProperties())
+        {
+            // Only apply to string properties
+            if (prop.PropertyType != typeof(string))
+                continue;
+
+            // Check if the property has the EncryptedString attribute
+            if (prop.GetCustomAttributes(typeof(EncryptedStringAttribute), true).FirstOrDefault() != null)
+            {
+                // Convert prop.Name to camelCase for JSON schema property lookup
+                var jsonPropName = JsonNamingPolicy.CamelCase.ConvertName(prop.Name);
+
+                if (schema.Properties.TryGetValue(jsonPropName, out var value))
+                {
+                    value.Format = "x-enc-string";
+                }
+            }
+        }
+    }
+}

src/SharedWeb/Swagger/GitCommitDocumentFilter.cs

@@ -0,0 +1,50 @@
+#nullable enable
+
+using System.Diagnostics;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace Bit.SharedWeb.Swagger;
+
+/// <summary>
+/// Add the Git commit that was used to generate the Swagger document, to help with debugging and reproducibility.
+/// </summary>
+public class GitCommitDocumentFilter : IDocumentFilter
+{
+
+    public void Apply(OpenApiDocument swaggerDoc, DocumentFilterContext context)
+    {
+        if (!string.IsNullOrEmpty(GitCommit))
+        {
+            swaggerDoc.Extensions.Add("x-git-commit", new Microsoft.OpenApi.Any.OpenApiString(GitCommit));
+        }
+    }
+
+    public static string? GitCommit => _gitCommit.Value;
+
+    private static readonly Lazy<string?> _gitCommit = new(() =>
+    {
+        try
+        {
+            var process = new Process
+            {
+                StartInfo = new ProcessStartInfo
+                {
+                    FileName = "git",
+                    Arguments = "rev-parse HEAD",
+                    RedirectStandardOutput = true,
+                    UseShellExecute = false,
+                    CreateNoWindow = true
+                }
+            };
+            process.Start();
+            var result = process.StandardOutput.ReadLine()?.Trim();
+            process.WaitForExit();
+            return result ?? string.Empty;
+        }
+        catch
+        {
+            return null;
+        }
+    });
+}

src/SharedWeb/Swagger/SourceFileLineOperationFilter.cs

@@ -0,0 +1,87 @@
+#nullable enable
+
+using System.Reflection;
+using System.Reflection.Metadata;
+using System.Reflection.Metadata.Ecma335;
+using System.Runtime.CompilerServices;
+using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace Bit.SharedWeb.Swagger;
+
+/// <summary>
+/// Adds source file and line number information to the Swagger operation description.
+/// This can be useful for locating the source code of the operation in the repository,
+/// as the generated names are based on the HTTP path, and are hard to search for.
+/// </summary>
+public class SourceFileLineOperationFilter : IOperationFilter
+{
+    private static readonly string _gitCommit = GitCommitDocumentFilter.GitCommit ?? "main";
+
+    public void Apply(OpenApiOperation operation, OperationFilterContext context)
+    {
+
+        var (fileName, lineNumber) = GetSourceFileLine(context.MethodInfo);
+        if (fileName != null && lineNumber > 0)
+        {
+            // Add the information with a link to the source file at the end of the operation description
+            operation.Description +=
+                $"\nThis operation is defined on: [`https://github.com/bitwarden/server/blob/{_gitCommit}/{fileName}#L{lineNumber}`]";
+
+            // Also add the information as extensions, so other tools can use it in the future
+            operation.Extensions.Add("x-source-file", new OpenApiString(fileName));
+            operation.Extensions.Add("x-source-line", new OpenApiInteger(lineNumber));
+        }
+    }
+
+    private static (string? fileName, int lineNumber) GetSourceFileLine(MethodInfo methodInfo)
+    {
+        // Get the location of the PDB file associated with the module of the method
+        var pdbPath = Path.ChangeExtension(methodInfo.Module.FullyQualifiedName, ".pdb");
+        if (!File.Exists(pdbPath)) return (null, 0);
+
+        // Open the PDB file and read the metadata
+        using var pdbStream = File.OpenRead(pdbPath);
+        using var metadataReaderProvider = MetadataReaderProvider.FromPortablePdbStream(pdbStream);
+        var metadataReader = metadataReaderProvider.GetMetadataReader();
+
+        // If the method is async, the compiler will generate a state machine,
+        // so we can't look for the original method, but we instead need to look
+        // for the MoveNext method of the state machine.
+        var attr = methodInfo.GetCustomAttribute<AsyncStateMachineAttribute>();
+        if (attr?.StateMachineType != null)
+        {
+            var moveNext = attr.StateMachineType.GetMethod("MoveNext", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
+            if (moveNext != null) methodInfo = moveNext;
+        }
+
+        // Once we have the  method, we can get its sequence points
+        var handle = (MethodDefinitionHandle)MetadataTokens.Handle(methodInfo.MetadataToken);
+        if (handle.IsNil) return (null, 0);
+        var sequencePoints = metadataReader.GetMethodDebugInformation(handle).GetSequencePoints();
+
+        // Iterate through the sequence points and pick the first one that has a valid line number
+        foreach (var sp in sequencePoints)
+        {
+            var docName = metadataReader.GetDocument(sp.Document).Name;
+            if (sp.StartLine != 0 && sp.StartLine != SequencePoint.HiddenLine && !docName.IsNil)
+            {
+                var fileName = metadataReader.GetString(docName);
+                var repoRoot = FindRepoRoot(AppContext.BaseDirectory);
+                var relativeFileName = repoRoot != null ? Path.GetRelativePath(repoRoot, fileName) : fileName;
+                return (relativeFileName, sp.StartLine);
+            }
+        }
+
+        return (null, 0);
+    }
+
+    private static string? FindRepoRoot(string startPath)
+    {
+        var dir = new DirectoryInfo(startPath);
+        while (dir != null && !Directory.Exists(Path.Combine(dir.FullName, ".git")))
+            dir = dir.Parent;
+        return dir?.FullName;
+    }
+}