Atc.OpenApi

Atc.OpenApi

Target Framework: net9.0, net10.0

Extensions and utilities for working with OpenAPI specifications using Microsoft.OpenApi. Provides helper methods for parsing, analyzing, and extracting information from OpenAPI documents and schemas.

Why Use This Library?

Working with OpenAPI specifications programmatically requires extensive knowledge of the object model and common patterns. Atc.OpenApi simplifies this by providing:

• OpenAPI Extension Methods: Convenient extensions for common operations
• Schema Helpers: Extract and analyze schema information
• Data Type Utilities: Determine data types from OpenAPI schemas
• Operation Analysis: Get operation names and response schemas
• Model Extraction: Retrieve model schemas from responses
• Type-Safe Parsing: Strongly-typed access to OpenAPI components

Perfect for:

• API code generators
• OpenAPI documentation tools
• API client generators
• Schema validation tools
• API specification analyzers
• OpenAPI-first development workflows

Installation

dotnet add package Atc.OpenApi

Target Framework

• .NET 9.0

Key Features

• Extension methods for OpenApiOperation
• Extension methods for OpenApiSchema
• Schema data type detection and extraction
• Operation name retrieval
• Model schema extraction from responses
• Support for complex schema analysis
• Integration with Microsoft.OpenApi.Readers

Requirements

• .NET 9

Key Dependencies

• Microsoft.OpenApi.Readers
• Atc (foundation library)

Main Components

OpenApiOperation Extensions

Work with OpenAPI operations:

• GetOperationName(): Extracts operation identifier
• GetModelSchemaFromResponse(): Gets the response model schema

OpenApiSchema Extensions

Analyze OpenAPI schemas:

• GetDataType(): Determines the data type of a schema
• Schema property analysis
• Type detection and mapping

Code documentation

References

References extended

Usage Examples

Working with OpenAPI Operations

using Atc.OpenApi;
using Microsoft.OpenApi.Models;

// Get operation name
var operationName = openApiOperation.GetOperationName();
Console.WriteLine($"Operation: {operationName}");

// Get model schema from response
var modelSchema = openApiOperation.GetModelSchemaFromResponse();
if (modelSchema != null)
{
    Console.WriteLine($"Response Type: {modelSchema.Type}");
}

Analyzing OpenAPI Schemas

using Atc.OpenApi;
using Microsoft.OpenApi.Models;

OpenApiSchema schema = /* your schema */;

// Get data type information
var dataType = schema.GetDataType();
Console.WriteLine($"Data Type: {dataType}");

// Check schema properties
if (schema.Properties != null)
{
    foreach (var property in schema.Properties)
    {
        Console.WriteLine($"Property: {property.Key}, Type: {property.Value.Type}");
    }
}

Reading and Analyzing OpenAPI Documents

using Microsoft.OpenApi.Readers;
using Atc.OpenApi;

// Read OpenAPI document
var openApiDocument = new OpenApiStringReader().Read(yamlContent, out var diagnostic);

// Analyze operations
foreach (var path in openApiDocument.Paths)
{
    foreach (var operation in path.Value.Operations)
    {
        var operationName = operation.Value.GetOperationName();
        var responseSchema = operation.Value.GetModelSchemaFromResponse();

        Console.WriteLine($"Path: {path.Key}");
        Console.WriteLine($"Method: {operation.Key}");
        Console.WriteLine($"Operation: {operationName}");
    }
}

Contributing

Contributions are welcome! Please see the main repository README for contribution guidelines.