public async void InvokeQueryRequestMiddleware_Transforms_ODataQueryRequest()
{
// Arrange
RequestDelegate next = c => Task.CompletedTask;
IODataQueryRequestParser[] parsers = new IODataQueryRequestParser[]
{
new DefaultODataQueryRequestParser()
};
ODataQueryRequestMiddleware middleware = new ODataQueryRequestMiddleware(parsers, next);
HttpContext context = new DefaultHttpContext();
HttpRequest request = context.Request;
context.Request.Path = new PathString("/$query");
request.ContentType = "text/plain";
request.Method = "Post";
context.Request.Body = new MemoryStream(Encoding.UTF8.GetBytes("$filter=Id le 5"));
// Act
await middleware.Invoke(context);
// Assert
Assert.Equal("Get", request.Method, ignoreCase: true);
Assert.Equal("?$filter=Id le 5", request.QueryString.Value);
}
/// <summary>
/// Transforms a POST request targeted at a resource path ending in $query into a GET request.
/// The query options are parsed from the request body and appended to the request URL.
/// </summary>
/// <param name="parser">The query request parser.</param>
/// <param name="request">The Http request.</param>
internal static async Task TransformQueryRequestAsync(IODataQueryRequestParser parser, HttpRequest request)
{
if (request == null)
{
throw Error.ArgumentNull(nameof(request));
}
// Parse query options in request body
string queryOptions = await parser.ParseAsync(request).ConfigureAwait(false);
string requestPath = request.Path.Value.TrimEnd('/');
string queryString = request.QueryString.Value;
// Strip off the /$query part
requestPath = requestPath.Substring(0, requestPath.LastIndexOf("/$query", StringComparison.OrdinalIgnoreCase));
if (!string.IsNullOrWhiteSpace(queryOptions))
{
if (string.IsNullOrWhiteSpace(queryString))
{
queryString = '?' + queryOptions;
}
else
{
queryString += '&' + queryOptions;
}
}
request.Path = new PathString(requestPath);
request.QueryString = new QueryString(queryString);
request.Method = HttpMethods.Get;
}
/// <summary>
/// Instantiates a new instance of <see cref="ODataQueryRequestMiddleware"/>.
/// </summary>
/// <param name="queryRequestParser">The query request parser.</param>
/// <param name="next">The next middleware.</param>
public ODataQueryRequestMiddleware(IODataQueryRequestParser queryRequestParser, RequestDelegate next)
{
_parser = queryRequestParser;
_next = next;
}
