/// <summary>
/// Retrieves a string by using a http post to a remote url.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
private async Task <HttpResult> LoadFromUrlByPost(HttpDataRequest request)
{
var uri = BuildRequestUrl(request);
var content = CreateHttpContentFromRequest(request);
var response = await client.PostAsync(uri, content);
var result = await ConvertHttpResponseToHttpResult(response, request.ResultIsList);
return(result);
}
/// <summary>
/// Retrieves a string and the request result details from an url. Is encapsulated in a HttpResult.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
private async Task <HttpResult> LoadFromUrlByGet(HttpDataRequest request)
{
var query = BuildRequestUrl(request);
HttpResponseMessage response = null;
response = await client.GetAsync(query);
var result = await ConvertHttpResponseToHttpResult(response, request.ResultIsList);
return(result);
}
/// <summary>
/// Loads a string from a remote endpoint.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public async Task <HttpResult> LoadFromUrl(HttpDataRequest request)
{
if (request.Method == HttpMethod.Get)
{
return(await LoadFromUrlByGet(request));
}
else if (request.Method == HttpMethod.Post)
{
return(await LoadFromUrlByPost(request));
}
else
{
throw new ArgumentException($"Currently only Get and Post are supported but {request.Method} was requested.");
}
}
/// <summary>
/// Builds an url containing the base url, remote endpoint and url parameters.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
private string BuildRequestUrl(HttpDataRequest request)
{
var builder = new UriBuilder(baseUrl);
builder.Path = request.TotalPath;
var query = HttpUtility.ParseQueryString(builder.Query);
foreach (var pair in request.UrlParameters)
{
query[pair.Key] = pair.Value;
}
builder.Query = query.ToString();
return(builder.ToString());
}
/// <summary>
/// Creates the content for a http post.
/// </summary>
/// <param name="request"></param>
/// <returns><see cref="StringContent"/> if the request specifies a body, <see cref="FormUrlEncodedContent"/> is the request specifies form url encoded parameters or an empty <see cref="StringContent"/> if nothing is specified.</returns>
/// <exception cref="ArgumentException"></exception>
private HttpContent CreateHttpContentFromRequest(HttpDataRequest request)
{
if (!string.IsNullOrEmpty(request.Body) && request.FormParameters.Count > 0)
{
throw new ArgumentException("A request has a body set as well as form parameters. Only one can be processed at a time.");
}
if (!string.IsNullOrEmpty(request.Body))
{
return(new StringContent(request.Body));
}
else if (request.FormParameters.Count > 0)
{
return(new FormUrlEncodedContent(request.FormParameters));
}
else
{
return(new StringContent(string.Empty));
}
}