/// <summary>Process the request.</summary>
/// <param name="appInner"> The application inner.</param>
/// <param name="fhirServerUrl">URL of the fhir server.</param>
public static void ProcessRequest(IApplicationBuilder appInner, string fhirServerUrl)
{
string serialized;
// run the proxy for this request
appInner.RunProxy(async context =>
{
// look for a FHIR server header
if (context.Request.Headers.ContainsKey(Program._proxyHeaderKey) &&
(context.Request.Headers[Program._proxyHeaderKey].Count > 0))
{
fhirServerUrl = context.Request.Headers[Program._proxyHeaderKey][0];
}
// create some response objects
HttpResponseMessage response = new HttpResponseMessage();
StringContent localResponse;
r5s.FhirJsonSerializer serializer = new r5s.FhirJsonSerializer();
// default to returning the representation if not specified
string preferredResponse = "return=representation";
// check for headers we are interested int
foreach (KeyValuePair <string, StringValues> kvp in context.Request.Headers)
{
if (kvp.Key.ToLowerInvariant() == "prefer")
{
preferredResponse = kvp.Value;
}
}
// act depending on request type
switch (context.Request.Method.ToUpperInvariant())
{
case "GET":
// check for an ID
string requestUrl = context.Request.Path;
if (requestUrl.EndsWith('/'))
{
requestUrl = requestUrl.Substring(0, requestUrl.Length - 1);
}
string id = requestUrl.Substring(requestUrl.LastIndexOf('/') + 1);
// check for a subscription
if (SubscriptionManager.TryGetBasicSerialized(id, out serialized))
{
// build our response
response.Content = new StringContent(
serialized,
Encoding.UTF8,
"application/fhir+json");
response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/fhir+json");
response.StatusCode = System.Net.HttpStatusCode.OK;
// done
return(response);
}
// check for a topic
if (SubscriptionTopicManager.TryGetBasicSerialized(id, out serialized))
{
// build our response
response.Content = new StringContent(
serialized,
Encoding.UTF8,
"application/fhir+json");
response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/fhir+json");
response.StatusCode = System.Net.HttpStatusCode.OK;
// done
return(response);
}
// look for query parameters for a search we are interested in
if (context.Request.Query.ContainsKey("code"))
{
// check for topic
if (context.Request.Query["code"] == "R5SubscriptionTopic")
{
// serialize the bundle of topics
response.Content = new StringContent(
serializer.SerializeToString(SubscriptionTopicManager.GetTopicsBundle(true)));
response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/fhir+json");
response.StatusCode = System.Net.HttpStatusCode.OK;
return(response);
}
// check for basic
if (context.Request.Query["code"] == "R5Subscription")
{
// serialize the bundle of subscriptions
response.Content = new StringContent(
serializer.SerializeToString(SubscriptionManager.GetSubscriptionsBundle(true)));
response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/fhir+json");
response.StatusCode = System.Net.HttpStatusCode.OK;
return(response);
}
}
break;
case "PUT":
// don't deal with PUT yet
response.StatusCode = System.Net.HttpStatusCode.NotImplemented;
return(response);
case "POST":
try
{
// grab the message body to look at
System.IO.StreamReader requestReader = new System.IO.StreamReader(context.Request.Body);
string requestContent = requestReader.ReadToEndAsync().Result;
r5s.FhirJsonParser parser = new r5s.FhirJsonParser();
r5.Basic basic = parser.Parse <r5.Basic>(requestContent);
// check to see if this is a something we are interested in
if ((basic.Code != null) &&
(basic.Code.Coding != null) &&
basic.Code.Coding.Any())
{
// look for codes we want
foreach (Coding coding in basic.Code.Coding)
{
if (coding.System.Equals("http://hl7.org/fhir/resource-types", StringComparison.Ordinal) &&
coding.Code.Equals("R5SubscriptionTopic", StringComparison.Ordinal))
{
// posting topics is not yet implemented
response.StatusCode = HttpStatusCode.NotImplemented;
return(response);
}
if (coding.System.Equals("http://hl7.org/fhir/resource-types", StringComparison.Ordinal) &&
coding.Code.Equals("R5Subscription", StringComparison.Ordinal))
{
// check for having the required resource
if ((basic.Extension == null) ||
(!basic.Extension.Any()) ||
(!basic.Extension[0].Url.Equals("http://hl7.org/fhir/StructureDefinition/json-embedded-resource", StringComparison.Ordinal)))
{
response.StatusCode = System.Net.HttpStatusCode.BadRequest;
return(response);
}
// check to see if the manager does anything with this text
SubscriptionManager.HandlePost(
basic.Extension[0].Value.ToString(),
out r5.Subscription subscription,
out HttpStatusCode statusCode,
out string failureContent,
true);
// check for errors
if (statusCode != HttpStatusCode.Created)
{
switch (preferredResponse)
{
case "return=minimal":
localResponse = new StringContent(string.Empty, Encoding.UTF8, "text/plain");
break;
case "return=OperationOutcome":
r5.OperationOutcome outcome = new r5.OperationOutcome()
{
Id = Guid.NewGuid().ToString(),
Issue = new List <r5.OperationOutcome.IssueComponent>()
{
new r5.OperationOutcome.IssueComponent()
{
Severity = r5.OperationOutcome.IssueSeverity.Error,
Code = r5.OperationOutcome.IssueType.Unknown,
Diagnostics = failureContent,
},
},
};
localResponse = new StringContent(
serializer.SerializeToString(outcome),
Encoding.UTF8,
"application/fhir+json");
break;
default:
localResponse = new StringContent(failureContent, Encoding.UTF8, "text/plain");
break;
}
response.Content = localResponse;
response.StatusCode = statusCode;
return(response);
}
// figure out our link to this resource
string url = Program.UrlForResourceId("Basic", subscription.Id);
switch (preferredResponse)
{
case "return=minimal":
localResponse = new StringContent(string.Empty, Encoding.UTF8, "text/plain");
break;
case "return=OperationOutcome":
r5.OperationOutcome outcome = new r5.OperationOutcome()
{
Id = Guid.NewGuid().ToString(),
Issue = new List <r5.OperationOutcome.IssueComponent>()
{
new r5.OperationOutcome.IssueComponent()
{
Severity = r5.OperationOutcome.IssueSeverity.Information,
Code = r5.OperationOutcome.IssueType.Value,
},
},
};
localResponse = new StringContent(
serializer.SerializeToString(outcome),
Encoding.UTF8,
"application/fhir+json");
break;
default:
localResponse = new StringContent(
serializer.SerializeToString(SubscriptionManager.WrapInBasic(subscription)),
Encoding.UTF8,
"application/fhir+json");
break;
}
response.Headers.Add("Location", url);
response.Headers.Add("Access-Control-Expose-Headers", "Location,ETag");
response.Content = localResponse;
response.StatusCode = HttpStatusCode.Created;
return(response);
}
}
}
}
catch (Exception)
{
}
break;
case "DELETE":
try
{
// check to see if this is a subscription
if (SubscriptionManager.HandleDelete(context.Request))
{
// deleted
response.StatusCode = System.Net.HttpStatusCode.NoContent;
return(response);
}
// fall through to proxy
}
catch (Exception)
{
}
break;
}
// if we're still here, proxy this call
ForwardContext proxiedContext = context.ForwardTo(fhirServerUrl);
// send to server and await response
return(await proxiedContext.Send().ConfigureAwait(false));
});
}
