using System;

using ServiceStack.Web;

using ServiceStack.Host.Handlers;

namespace ServiceStack;

/// <summary>

/// Add a new API Handler at a custom route.

///

/// RawHttpHandlers.Add(ApiHandlers.Json("/api/{Request}")) => delegates /api/* requests to JSON Request Handler, e.g:

/// - /api/Hello => {"result":"Hello"}

/// - /api/Hello?name=World => {"result":"Hello, World"}

/// </summary>

public static class ApiHandlers

{

public static Func<IHttpRequest, HttpAsyncTaskHandler> Json(string apiPath) =>

Generic(apiPath, MimeTypes.Json, RequestAttributes.Reply | RequestAttributes.Json, Feature.Json);

public static Func<IHttpRequest, HttpAsyncTaskHandler> Jsv(string apiPath) =>

Generic(apiPath, MimeTypes.Jsv, RequestAttributes.Reply | RequestAttributes.Jsv, Feature.Jsv);

public static Func<IHttpRequest, HttpAsyncTaskHandler> Csv(string apiPath) =>

Generic(apiPath, MimeTypes.Csv, RequestAttributes.Reply | RequestAttributes.Csv, Feature.Csv);

public static Func<IHttpRequest, HttpAsyncTaskHandler> Xml(string apiPath) =>

Generic(apiPath, MimeTypes.Xml, RequestAttributes.Reply | RequestAttributes.Xml, Feature.Xml);

public static Func<IHttpRequest, HttpAsyncTaskHandler> Generic(string apiPath,

string contentType, RequestAttributes requestAttributes, Feature feature)

{

if (string.IsNullOrEmpty(apiPath))

throw new ArgumentNullException(nameof(apiPath));

if (apiPath[0] != '/')

throw new ArgumentException(apiPath + " must start with '/'");

if (!apiPath.EndsWith("/{Request}"))

throw new ArgumentException(apiPath + " must end with '/{Request}'");

var useApiPath = apiPath.LastLeftPart('/') + '/';

return req => {

// Don't handle OPTIONS CORS requests

if (req.HttpMethod == HttpMethods.Options) return null;

var pathInfo = req.PathInfo;

if (pathInfo.StartsWith(useApiPath))

{

var apiName = pathInfo.LastRightPart('/');

return new GenericHandler(contentType, requestAttributes, feature) {

RequestName = apiName

};

}

return null;

};

}

}