public async Task InvokeAsync(PipelineContext context, PipelineDelegate next)
{
if (_queryParameters.Any())
{
if (!context.GetFirst(out Uri uri))
{
throw new PipelineDependencyException <Uri>(this);
}
var keyValuePairs = NameValueToKeyValuePairs(HttpUtility.ParseQueryString(uri.Query));
foreach (var queryParameter in _queryParameters)
{
if (context.Get(queryParameter.ContextVariableName, out string contextParameterValue) && !string.IsNullOrEmpty(contextParameterValue))
{
keyValuePairs.Add(new KeyValuePair <string, string>(queryParameter.ContextVariableName, contextParameterValue));
}
else
if (!queryParameter.Optional)
{
context.AddNotification(this, $"Context variable '{queryParameter.ContextVariableName}' was not found or does not contain a value and is not optional");
return;
}
}
var ub = new UriBuilder(uri);
QueryBuilder qb = new QueryBuilder(keyValuePairs);
ub.Query = qb.ToString();
context.AddOrReplace(ub.Uri);
await next.Invoke();
}
}
public async Task InvokeAsync(PipelineContext context, PipelineDelegate next)
{
if (context.GetFirst(out IEnumerable <DublinBikeStation> response))
{
if (context.Get("orderBy", out string value))
{
var index = orderIdentifiers
.Select((x, i) => new { index = i, identifer = x })
.Where(x => string.Compare(x.identifer, value, true) == 0)
.Select(x => x.index)
.FirstOrDefault();
switch (index)
{
case 1:
response = response.OrderBy(x => x.Name);
break;
case 2:
response = response.OrderByDescending(x => x.Available_bikes);
break;
case 3:
response = response.OrderByDescending(x => x.Available_bike_stands);
break;
case 4:
response = response.OrderByDescending(x => x.Last_update);
break;
default:
response = response.OrderBy(x => x.Number);
break;
}
context.AddOrReplace("response", response.Select(x => x));
}
}
await next.Invoke();
}
public async Task InvokeAsync(PipelineContext context, PipelineDelegate next)
{
if (!context.GetFirst(out HttpRequestMessage httpRequestMessage) ||
httpRequestMessage.Method != HttpMethod.Get)
{
await next();
return;
}
var ifNoneMatch = httpRequestMessage.Headers.IfNoneMatch;
var eTag = ifNoneMatch?.FirstOrDefault();
await next();
if (context.GetFirst(out HttpResponseMessage httpResponseMessage) &&
httpResponseMessage.IsSuccessStatusCode)
{
string hash;
using (var md5 = MD5.Create())
{
var md5Hash = md5.ComputeHash(await httpResponseMessage.Content.ReadAsStreamAsync());
hash = Encoding.ASCII.GetString(md5Hash);
httpResponseMessage.Headers.TryAddWithoutValidation("Etag", hash);
}
if ((eTag != null) && (string.Compare(eTag.Tag, hash) == 0))
{
context
.AddOrReplace(new HttpResponseMessage()
{
StatusCode = System.Net.HttpStatusCode.NotModified
})
.Add(EtagCacheEnum.NotModified);
}
}
}
