public async Task <HalResourceInspectedContext> InspectAsync(HalResourceInspectingContext context)
{
this.inspectingContext = context
?? throw new ArgumentNullException(nameof(context));
this.currentIndex = 0;
return(await Next());
}
public HalResourceInspectedContext(HalResourceInspectingContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
this.Resource = context.Resource;
this.ActionContext = context.ActionContext;
this.IsRootResource = context.IsRootResource;
}
public void OnInspectingResource(HalResourceInspectingContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.Resource == null)
{
logger.LogDebug("Resource is null. Nothing to inspect.");
return;
}
if (context.ActionContext == null)
{
throw new ArgumentException("ActionContext cannot be null.", nameof(context));
}
if (!(context.ActionContext.ActionDescriptor is ControllerActionDescriptor descriptor))
{
throw new HalException("Could not establish ControllerActionDescriptor reference.");
}
var links = linkService.GetLinks <HalLinkAttribute>(descriptor, context.ActionContext, context.OriginalObject);
if (context.Resource.Links == null && links.Count > 0)
{
context.Resource.Links = new List <ILink>();
}
foreach (var link in links)
{
var hlink = new Link(link.Rel, link.Uri);
context.Resource.Links.Add(hlink);
if (link.IsSingular)
{
if (context.Resource.SingularRelations == null)
{
context.Resource.SingularRelations = new HashSet <string>();
}
if (!context.Resource.SingularRelations.Contains(link.Rel))
{
context.Resource.SingularRelations.Add(link.Rel);
}
}
}
}
public async Task <HalResourceInspectedContext> OnResourceInspectionAsync(
HalResourceInspectingContext context,
HalResourceInspectionDelegate next)
{
var inspectedContext = await next();
if (inspectedContext.Resource?.Links == null)
{
return(inspectedContext);
}
var httpContext = context.ActionContext.HttpContext;
var requestFeature = httpContext.Features.Get <IHttpRequestFeature>();
var links = inspectedContext.Resource.Links.ToList();
foreach (var link in links)
{
// TODO: Account for external links.
var halRequestFeature = new HalHttpRequestFeature(requestFeature)
{
Method = "GET",
Path = link.HRef
};
var linkContext = new LinkValidationHttpContext(httpContext, halRequestFeature);
// Invoke the mvc pipeline. The LinkValidationFilter will short circuit
// the request after the authorization filters have executed.
await context.MvcPipeline.Pipeline(linkContext);
var response = linkContext.Response as HalHttpResponse;
if (response.Resource == LinkValidatedResult.LinkValidatedObject)
{
logger.LogDebug("Client has permissions to access link '{0}'.", link);
}
else
{
logger.LogDebug("Client does not have permission to access link '{0}'. Removing link from resource.", link);
inspectedContext.Resource.Links.Remove(link);
}
}
return(inspectedContext);
}
public void OnInspectingResource(HalResourceInspectingContext context)
{
}
public async Task <HalResourceInspectedContext> OnResourceInspectionAsync(
HalResourceInspectingContext context,
HalResourceInspectionDelegate next)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
if (!context.IsRootResource)
{
throw new NotSupportedException("This inspector does not support embedded resources.");
}
if (context.Resource == null)
{
return(await next());
}
if (context.ActionContext == null)
{
throw new ArgumentException("ActionContext cannot be null.", nameof(context));
}
if (!(context.ActionContext.ActionDescriptor is ControllerActionDescriptor descriptor))
{
throw new HalException("Could not establish ControllerActionDescriptor reference.");
}
if (context.ActionContext.HttpContext == null || context.ActionContext.HttpContext.Features == null)
{
throw new ArgumentException("HttpContext features cannot be null.", nameof(context));
}
if (context.MvcPipeline == null)
{
throw new ArgumentException("Context does not contain the mvc pipeline.", nameof(context));
}
var requestFeature = context.ActionContext.HttpContext.Features.Get <IHttpRequestFeature>();
var links = linkService.GetLinks <HalEmbedAttribute>(descriptor, context.ActionContext, context.OriginalObject);
foreach (var link in links)
{
var halRequestFeature = new HalHttpRequestFeature(requestFeature)
{
Method = "GET",
Path = link.Uri
};
var halContext = new HalHttpContext(context.ActionContext.HttpContext, halRequestFeature);
logger.LogDebug("About to invoke MVC pipeline with a GET request on path '{0}'.", link.Uri);
await context.MvcPipeline.Pipeline(halContext);
var response = halContext.Response as HalHttpResponse;
if (response.StatusCode >= 200 && response.StatusCode <= 299)
{
logger.LogDebug("MVC pipeline returned success status code {0}. Invoking HAL resource factory.", response.StatusCode);
IResource embedded = await context.EmbeddedResourcePipeline(response.ActionContext, response.Resource);
embedded.Rel = link.Rel;
if (embedded is IResourceCollection collection)
{
if (collection.Collection != null)
{
logger.LogDebug("Embedding collection of {0} resources to rel '{0}'", collection.Collection.Count, link.Rel);
foreach (var item in collection.Collection)
{
item.Rel = link.Rel;
context.Resource.Embedded.Add(item);
}
}
}
else
{
logger.LogDebug("Embedding resource to rel '{0}'", link.Rel);
context.Resource.Embedded.Add(embedded);
}
}
else
{
logger.LogWarning("MVC pipeline returned non-success status code {0}. Ignoring result.", response.StatusCode);
}
}
var result = await next();
logger.LogTrace("After invoke next.");
return(result);
}
