The Microsoft.OpenAPI.OData.Reader library helps represent an OData service metadata as an OpenApi description. It converts OData CSDL, the XML representation of the Entity Data Model (EDM) describing an OData service into Open API based on OpenAPI.NET object model.

The conversion is based on the mapping doc from OASIS OData OpenAPI v1.0 and uses the following :

1. Capabilities vocabulary annotation
2. Authorization vocabulary annotation
3. Core vocabulary annotation
4. Navigation property path
5. Edm operation and operation import path

The image below is generic overview of how this library can convert the EDM model to an OpenAPI.NET document object.

For more information on the CSDL and Entity Data model, please refer to http://www.odata.org/documentation. For more information about the Open API object of model, please refer to http://github.com/microsoft/OpenAPI.NET

The following sample code illustrates the use of the library

public static void GenerateOpenApiDescription()
{
    IEdmModel model = GetEdmModel();
    OpenApiDocument document = model.ConvertToOpenApi();
    var outputJSON = document.SerializeAsJson(OpenApiSpecVersion.OpenApi3_0);
    var outputYAML = document.SerializeAsYaml(OpenApiSpecVersion.OpenApi3_0);
}

public static IEdmModel GetEdmModel()
{
    // load EDM model here...
}

Or with the convert settings:

public static void GenerateOpenApiDescription()
{
    IEdmModel model = GetEdmModel();
    OpenApiConvertSettings settings = new OpenApiConvertSettings
    {
        // configuration
    };
    OpenApiDocument document = model.ConvertToOpenApi(settings);
    var outputJSON = document.SerializeAsJson(OpenApiSpecVersion.OpenApi3_0);
    var outputYAML = document.SerializeAsYaml(OpenApiSpecVersion.OpenApi3_0);
}

public static IEdmModel GetEdmModel()
{
    // load EDM model here...
}

The GetEdmModel() method can load a model in 3 ways:

1. Create the Edm model from scratch. For details refer building a basic model

2. Load the Edm model from CSDL file. The following shows a code sample that loads a model from a csdl file.

   public static IEdmModel GetEdmModel()
   {
       string csdlFilePath = @"c:\csdl.xml";
       string csdl = System.IO.File.ReadAllText(csdlFilePath);
       IEdmModel model = CsdlReader.Parse(XElement.Parse(csdl).CreateReader());
       return model;
   }

3. Create the Edm model using Web API OData model builder. For details refer to the web api model builder article

The OpenAPI.OData.reader nuget package is at: https://www.nuget.org/packages/Microsoft.OpenApi.OData/

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