/// <summary>
/// Parse the <see cref="IOwinRequest"/> into an <see cref="ILtiRequest"/>.
/// </summary>
/// <param name="request">The <see cref="IOwinRequest"/> to parse.</param>
/// <returns>The <see cref="ILtiRequest"/>.</returns>
public static async Task <ILtiRequest> ParseLtiRequestAsync(this IOwinRequest request)
{
var ltiRequest = new LtiRequest(null)
{
Url = request.Uri,
HttpMethod = request.Method
};
// LTI launch and content item requests are sent as form posts
if (request.ContentType.Equals("application/x-www-form-urlencoded"))
{
var form = await request.ReadFormAsync();
foreach (var pair in form)
{
ltiRequest.Parameters.Add(pair.Key, string.Join(",", pair.Value));
}
return(ltiRequest);
}
// LTI Outcome requests and responses are sent as Plain Old XML
if (request.ContentType.Equals("application/xml"))
{
using (var ms = new MemoryStream())
{
try
{
await request.Body.CopyToAsync(ms);
using (var reader = new StreamReader(ms))
{
ltiRequest.ImsxPoxEnvelope = await reader.ReadToEndAsync();
}
}
finally
{
if (request.Body.CanSeek)
{
request.Body.Position = 0;
}
}
}
var authorizationHeader = request.GetAuthorizationHeader();
ltiRequest.Parameters.Add(authorizationHeader.Parameters);
return(ltiRequest);
}
return(ltiRequest);
}
