/// <summary>
/// Determines whether the route constraint matches the specified criteria.
/// </summary>
/// <param name="httpContext">The current <see cref="HttpContext">HTTP context</see>.</param>
/// <param name="route">The current <see cref="IRouter">route</see>.</param>
/// <param name="routeKey">The key of the route parameter to match.</param>
/// <param name="values">The current <see cref="RouteValueDictionary">collection</see> of route values.</param>
/// <param name="routeDirection">The <see cref="RouteDirection">route direction</see> to match.</param>
/// <returns>True if the route constraint is matched; otherwise, false.</returns>
public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection)
{
if (IsNullOrEmpty(routeKey))
{
return(false);
}
var properties = httpContext.ApiVersionProperties();
if (values.TryGetValue(routeKey, out string value))
{
properties.RawApiVersion = value;
}
else
{
return(false);
}
if (routeDirection == UrlGeneration)
{
return(!IsNullOrEmpty(value));
}
if (TryParse(value, out var requestedVersion))
{
properties.ApiVersion = requestedVersion;
return(true);
}
return(false);
}
RequestHandler ClientError(HttpContext httpContext, ActionSelectionResult selectionResult)
{
Contract.Requires(httpContext != null);
Contract.Requires(selectionResult != null);
const RequestHandler NotFound = default(RequestHandler);
var candidates = selectionResult.CandidateActions.OrderBy(kvp => kvp.Key).SelectMany(kvp => kvp.Value).Distinct().ToArray();
if (candidates.Length == 0)
{
return(NotFound);
}
var properties = httpContext.ApiVersionProperties();
var method = httpContext.Request.Method;
var requestUrl = new Lazy <string>(httpContext.Request.GetDisplayUrl);
var requestedVersion = properties.RawApiVersion;
var parsedVersion = properties.ApiVersion;
var actionNames = new Lazy <string>(() => Join(NewLine, candidates.Select(a => a.DisplayName)));
var allowedMethods = new Lazy <HashSet <string> >(() => AllowedMethodsFromCandidates(candidates));
var apiVersions = new Lazy <ApiVersionModel>(selectionResult.CandidateActions.SelectMany(l => l.Value.Select(a => a.GetProperty <ApiVersionModel>()).Where(m => m != null)).Aggregate);
var handlerContext = new RequestHandlerContext(ErrorResponseProvider, ApiVersionReporter, apiVersions);
if (parsedVersion == null)
{
if (IsNullOrEmpty(requestedVersion))
{
if (Options.AssumeDefaultVersionWhenUnspecified || candidates.Any(c => c.IsApiVersionNeutral()))
{
return(VersionNeutralUnmatched(handlerContext, requestUrl.Value, method, allowedMethods.Value, actionNames.Value));
}
return(UnspecifiedApiVersion(handlerContext, actionNames.Value));
}
else if (!TryParse(requestedVersion, out parsedVersion))
{
return(MalformedApiVersion(handlerContext, requestUrl.Value, requestedVersion));
}
}
else if (IsNullOrEmpty(requestedVersion))
{
return(VersionNeutralUnmatched(handlerContext, requestUrl.Value, method, allowedMethods.Value, actionNames.Value));
}
else
{
requestedVersion = parsedVersion.ToString();
}
return(Unmatched(handlerContext, requestUrl.Value, method, allowedMethods.Value, actionNames.Value, parsedVersion, requestedVersion));
}
/// <summary>
/// Gets the current API version requested.
/// </summary>
/// <param name="context">The current <see cref="HttpContext">HTTP context</see> to get the API version for.</param>
/// <returns>The requested <see cref="ApiVersion">API version</see> or <c>null</c>.</returns>
/// <remarks>This method will return <c>null</c> no service API version was requested or the requested
/// service API version is in an invalid format.</remarks>
/// <exception cref="AmbiguousApiVersionException">Multiple, different API versions were requested.</exception>
public static ApiVersion GetRequestedApiVersion(this HttpContext context)
{
Arg.NotNull(context, nameof(context));
return(context.ApiVersionProperties().ApiVersion);
}
RequestHandler ClientError(HttpContext httpContext, ActionSelectionResult selectionResult)
{
Contract.Requires(httpContext != null);
Contract.Requires(selectionResult != null);
const RequestHandler NotFound = default(RequestHandler);
var candidates = selectionResult.CandidateActions.OrderBy(kvp => kvp.Key).SelectMany(kvp => kvp.Value).Distinct().ToArray();
if (candidates.Length == 0)
{
return(NotFound);
}
var properties = httpContext.ApiVersionProperties();
var requestedVersion = default(string);
var parsedVersion = properties.ApiVersion;
var actionNames = new Lazy <string>(() => Join(NewLine, candidates.Select(a => a.DisplayName)));
var allowedMethods = new Lazy <HashSet <string> >(() => AllowedMethodsFromCandidates(candidates));
var newRequestHandler = default(Func <RequestHandlerContext, RequestHandler>);
var apiVersions = new Lazy <ApiVersionModel>(selectionResult.CandidateActions.SelectMany(l => l.Value.Select(a => a.GetProperty <ApiVersionModel>()).Where(m => m != null)).Aggregate);
var handlerContext = new RequestHandlerContext(ErrorResponseProvider, ApiVersionReporter, apiVersions);
if (parsedVersion == null)
{
var versionNeutral = new Lazy <bool>(() => candidates.Any(c => c.IsApiVersionNeutral()));
requestedVersion = properties.RawApiVersion;
if (IsNullOrEmpty(requestedVersion) && !versionNeutral.Value)
{
Logger.ApiVersionUnspecified(actionNames.Value);
handlerContext.Code = ApiVersionUnspecified;
handlerContext.Message = SR.ApiVersionUnspecified;
return(new BadRequestHandler(handlerContext));
}
else if (TryParse(requestedVersion, out parsedVersion))
{
Logger.ApiVersionUnmatched(parsedVersion, actionNames.Value);
handlerContext.Code = UnsupportedApiVersion;
if (allowedMethods.Value.Contains(httpContext.Request.Method))
{
newRequestHandler = c => new BadRequestHandler(c);
}
else
{
handlerContext.AllowedMethods = allowedMethods.Value.ToArray();
newRequestHandler = c => new MethodNotAllowedHandler(c);
}
}
else if (versionNeutral.Value)
{
Logger.ApiVersionUnspecified(actionNames.Value);
handlerContext.Code = UnsupportedApiVersion;
handlerContext.Message = SR.VersionNeutralResourceNotSupported.FormatDefault(httpContext.Request.GetDisplayUrl());
if (allowedMethods.Value.Contains(httpContext.Request.Method))
{
return(new BadRequestHandler(handlerContext));
}
handlerContext.AllowedMethods = allowedMethods.Value.ToArray();
return(new MethodNotAllowedHandler(handlerContext));
}
else
{
Logger.ApiVersionInvalid(requestedVersion);
handlerContext.Code = InvalidApiVersion;
newRequestHandler = c => new BadRequestHandler(c);
}
}
else
{
Logger.ApiVersionUnmatched(parsedVersion, actionNames.Value);
requestedVersion = parsedVersion.ToString();
handlerContext.Code = UnsupportedApiVersion;
if (allowedMethods.Value.Contains(httpContext.Request.Method))
{
newRequestHandler = c => new BadRequestHandler(c);
}
else
{
handlerContext.AllowedMethods = allowedMethods.Value.ToArray();
newRequestHandler = c => new MethodNotAllowedHandler(c);
}
}
handlerContext.Message = SR.VersionedResourceNotSupported.FormatDefault(httpContext.Request.GetDisplayUrl(), requestedVersion);
return(newRequestHandler(handlerContext));
}
public async Task Invoke(HttpContext context)
{
var reqestUrl = context.Request.GetDisplayUrl();
var response = context.Response;
var currentBody = response.Body;
using (var memoryStream = new MemoryStream())
{
response.Body = memoryStream;
await _next(context);
var apiVersionProperties = context.ApiVersionProperties();
var apiVersion = apiVersionProperties.RawApiVersion;
response.Body = currentBody;
memoryStream.Seek(0, SeekOrigin.Begin);
var readToEnd = new StreamReader(memoryStream).ReadToEnd();
var statusCode = response.StatusCode;
object objResult = null;
try
{
objResult = statusCode < 400 ? JsonConvert.DeserializeObject(readToEnd) : JsonConvert.DeserializeObject <ApiError>(readToEnd);
}
catch (Exception ex)
{
//TODO: Log Unknown Error Response Content
objResult = JsonConvert.DeserializeObject(readToEnd);
}
string statusMessage;
var sb = new StringBuilder();
sb.Append(Enum.GetName(typeof(HttpStatusCode), statusCode));
if (statusCode > 399)
{
if (statusCode == 401)
{
var authErrors = response.Headers["WWW-Authenticate"];
foreach (var authErr in authErrors)
{
sb.Append($" - {authErr.Replace("\"", "'")}");
}
}
}
statusMessage = sb.ToString();
var result = new ApiResponse((HttpStatusCode)statusCode, statusMessage, reqestUrl, apiVersion, objResult);
response.ContentType = response.ContentType ?? "application/json; charset=utf-8";
await response.WriteAsync(JsonConvert.SerializeObject(result));
}
}
