/// <summary>
/// Sets the cache-control header.
/// </summary>
/// <param name="bucketInfo">The bucket info dictionary.</param>
/// <param name="value">The cache control values.</param>
public static void SetCacheControl(this BucketInfo bucketInfo, CacheControlHeaderValue value)
{
if (value != null)
{
bucketInfo.Add("Cache-Control", value.ToString());
}
}
public void ToString_UseRequestDirectiveValues_AllSerializedCorrectly()
{
CacheControlHeaderValue cacheControl = new CacheControlHeaderValue();
Assert.Equal("", cacheControl.ToString());
// Note that we allow all combinations of all properties even though the RFC specifies rules what value
// can be used together.
// Also for property pairs (bool property + collection property) like 'NoCache' and 'NoCacheHeaders' the
// caller needs to set the bool property in order for the collection to be populated as string.
// Cache Request Directive sample
cacheControl.NoStore = true;
Assert.Equal("no-store", cacheControl.ToString());
cacheControl.NoCache = true;
Assert.Equal("no-store, no-cache", cacheControl.ToString());
cacheControl.MaxAge = new TimeSpan(0, 1, 10);
Assert.Equal("no-store, no-cache, max-age=70", cacheControl.ToString());
cacheControl.MaxStale = true;
Assert.Equal("no-store, no-cache, max-age=70, max-stale", cacheControl.ToString());
cacheControl.MaxStaleLimit = new TimeSpan(0, 2, 5);
Assert.Equal("no-store, no-cache, max-age=70, max-stale=125", cacheControl.ToString());
cacheControl.MinFresh = new TimeSpan(0, 3, 0);
Assert.Equal("no-store, no-cache, max-age=70, max-stale=125, min-fresh=180", cacheControl.ToString());
cacheControl = new CacheControlHeaderValue();
cacheControl.NoTransform = true;
Assert.Equal("no-transform", cacheControl.ToString());
cacheControl.OnlyIfCached = true;
Assert.Equal("no-transform, only-if-cached", cacheControl.ToString());
cacheControl.Extensions.Add(new NameValueHeaderValue("custom"));
cacheControl.Extensions.Add(new NameValueHeaderValue("customName", "customValue"));
Assert.Equal("no-transform, only-if-cached, custom, customName=customValue", cacheControl.ToString());
cacheControl = new CacheControlHeaderValue();
cacheControl.Extensions.Add(new NameValueHeaderValue("custom"));
Assert.Equal("custom", cacheControl.ToString());
}
public void ToString_UseResponseDirectiveValues_AllSerializedCorrectly()
{
CacheControlHeaderValue cacheControl = new CacheControlHeaderValue();
Assert.Equal("", cacheControl.ToString());
cacheControl.NoCache = true;
Assert.Equal("no-cache", cacheControl.ToString());
cacheControl.NoCacheHeaders.Add("token1");
Assert.Equal("no-cache=\"token1\"", cacheControl.ToString());
cacheControl.Public = true;
Assert.Equal("public, no-cache=\"token1\"", cacheControl.ToString());
cacheControl = new CacheControlHeaderValue();
cacheControl.Private = true;
Assert.Equal("private", cacheControl.ToString());
cacheControl.PrivateHeaders.Add("token2");
cacheControl.PrivateHeaders.Add("token3");
Assert.Equal("private=\"token2, token3\"", cacheControl.ToString());
cacheControl.MustRevalidate = true;
Assert.Equal("must-revalidate, private=\"token2, token3\"", cacheControl.ToString());
cacheControl.ProxyRevalidate = true;
Assert.Equal("must-revalidate, proxy-revalidate, private=\"token2, token3\"", cacheControl.ToString());
}
public static IResponse EnableCaching(this IResponse response, TimeSpan?timeSpan = null)
{
return(new ResponseDecorator(response, ctx =>
{
#if !DEBUG
var cacheControl = new CacheControlHeaderValue
{
Public = true,
MaxAge = timeSpan ?? TimeSpan.FromDays(150)
};
#else
var cacheControl = new CacheControlHeaderValue
{
NoCache = true,
};
#endif
ctx.Response.Headers[HeaderNames.CacheControl] = cacheControl.ToString();
}));
}
public void ToString_NegativeValues_UsesMinusSignRegardlessOfCurrentCulture()
{
RemoteExecutor.Invoke(() =>
{
var cacheControl = new CacheControlHeaderValue()
{
MaxAge = new TimeSpan(0, 0, -1),
MaxStale = true,
MaxStaleLimit = new TimeSpan(0, 0, -2),
MinFresh = new TimeSpan(0, 0, -3),
SharedMaxAge = new TimeSpan(0, 0, -4)
};
var ci = (CultureInfo)CultureInfo.CurrentCulture.Clone();
ci.NumberFormat.NegativeSign = "n";
CultureInfo.CurrentCulture = ci;
Assert.Equal("max-age=-1, s-maxage=-4, max-stale=-2, min-fresh=-3", cacheControl.ToString());
}).Dispose();
}
private static void NoCacheHeaders(ActionExecutedContext context)
{
var headerCache = new CacheControlHeaderValue()
{
NoCache = true
};
context.HttpContext.Response.Headers.Add("Cache-Control", headerCache.ToString());
StringValues dateValue;
context.HttpContext.Response.Headers.TryGetValue("Date", out dateValue);
if (string.IsNullOrEmpty(dateValue))
{
context.HttpContext.Response.Headers.Add("Date", DateTimeOffset.UtcNow.ToString());
}
context.HttpContext.Response.Headers.Add("Expires", DateTimeOffset.UtcNow.ToString());
}
private static void InitializeAzureStorage(IServiceProvider services, AzureBlobStorageImageProviderOptions options)
{
// Upload an image to the Azure Test Storage;
AzureBlobContainerClientOptions containerOptions = options.BlobContainers.First();
var container = new BlobContainerClient(containerOptions.ConnectionString, containerOptions.ContainerName);
container.CreateIfNotExists(PublicAccessType.Blob);
#if NETCOREAPP2_1
IHostingEnvironment environment = services.GetRequiredService <IHostingEnvironment>();
#else
IWebHostEnvironment environment = services.GetRequiredService <IWebHostEnvironment>();
#endif
BlobClient blob = container.GetBlobClient(TestConstants.ImagePath);
if (!blob.Exists())
{
IFileInfo file = environment.WebRootFileProvider.GetFileInfo(TestConstants.ImagePath);
using Stream stream = file.CreateReadStream();
// Set the max-age property so we get coverage for testing is in our Azure provider.
var cacheControl = new CacheControlHeaderValue
{
Public = true,
MaxAge = TimeSpan.FromDays(7),
MustRevalidate = true
};
var headers = new BlobHttpHeaders
{
CacheControl = cacheControl.ToString(),
};
blob.Upload(stream, httpHeaders: headers);
}
}
private void AddCacheHeaders(ActionExecutedContext context)
{
if (context.HttpContext.Response.StatusCode == 200)
{
var cacheControlHeaderValue = new CacheControlHeaderValue()
{
NoCache = false,
Public = (CacheType == ClientCacheControl.Public),
Private = (CacheType == ClientCacheControl.Private),
MaxAge = TimeSpan.FromSeconds(CacheSeconds)
};
context.HttpContext.Response.Headers.Add("Cache-Control", cacheControlHeaderValue.ToString());
StringValues dateValue;
context.HttpContext.Response.Headers.TryGetValue("Date", out dateValue);
if (string.IsNullOrEmpty(dateValue))
{
context.HttpContext.Response.Headers.Add("Date", DateTimeOffset.UtcNow.ToString());
context.HttpContext.Response.Headers.TryGetValue("Date", out dateValue);
}
context.HttpContext.Response.Headers.Add("Expires", DateTimeOffset.UtcNow.AddSeconds(CacheSeconds).ToString());
}
}
/// <summary>
/// Adds caching for GET and PUT if
/// cache control provided is not null
/// With PUT, since cache has been alreay invalidated,
/// we provide the new ETag (old one has been cleared in invalidation phase)
/// </summary>
/// <param name="entityTagKey"></param>
/// <param name="request"></param>
/// <param name="response"></param>
/// <param name="varyHeaders"></param>
/// <returns></returns>
internal Action AddCaching(
EntityTagKey entityTagKey,
HttpRequestMessage request,
HttpResponseMessage response,
IEnumerable <KeyValuePair <string, IEnumerable <string> > > varyHeaders)
{
return
(() =>
{
CacheControlHeaderValue cacheControlHeaderValue = CacheControlHeaderProvider(request);
if (cacheControlHeaderValue == null)
{
return;
}
TimedEntityTagHeaderValue eTagValue;
string uri = UriTrimmer(request.RequestUri);
// in case of GET and no ETag
// in case of PUT, we should return the new ETag of the resource
// NOTE: No need to check if it is in the cache. If it were, it would not get
// here
if (request.Method == HttpMethod.Get || request.Method == HttpMethod.Put)
{
// create new ETag only if it does not already exist
if (!_entityTagStore.TryGetValue(entityTagKey, out eTagValue))
{
eTagValue = new TimedEntityTagHeaderValue(ETagValueGenerator(uri, varyHeaders));
_entityTagStore.AddOrUpdate(entityTagKey, eTagValue);
}
// set ETag
response.Headers.ETag = eTagValue.ToEntityTagHeaderValue();
// set last-modified
if (AddLastModifiedHeader && response.Content != null &&
!response.Content.Headers.Any(x => x.Key.Equals(HttpHeaderNames.LastModified,
StringComparison.CurrentCultureIgnoreCase)))
{
response.Content.Headers.Add(HttpHeaderNames.LastModified, eTagValue.LastModified.ToString("r"));
}
// set Vary
if (AddVaryHeader && _varyByHeaders != null && _varyByHeaders.Length > 0)
{
response.Headers.Add(HttpHeaderNames.Vary, _varyByHeaders);
}
response.Headers.TryAddWithoutValidation(HttpHeaderNames.CacheControl, cacheControlHeaderValue.ToString());
}
});
}
public void SetCacheControlHeaders(HttpCacheability?httpCacheability = null,
DateTime?lastModified = null, TimeSpan?maxAge = null)
{
// Cache control headers are stored temporarily in an aggregated object
// and written to the single response header. The reason behind this is
// that this method may be called multiple times with different kinds
// of parameters.
var writeCacheControlHeader = false;
try
{
if (httpCacheability.HasValue)
{
switch (httpCacheability)
{
case HttpCacheability.NoCache:
_cacheHeaders.NoCache = true;
_cacheHeaders.NoStore = true;
_cacheHeaders.ProxyRevalidate = true;
_cacheHeaders.MustRevalidate = true;
break;
case HttpCacheability.Private:
_cacheHeaders.Private = true;
break;
case HttpCacheability.Public:
_cacheHeaders.Public = true;
break;
default:
throw new ArgumentOutOfRangeException(nameof(httpCacheability), httpCacheability, null);
}
writeCacheControlHeader = true;
}
if (lastModified.HasValue)
{
// make sure that the date is in the past
var t = lastModified.Value;
if (t > DateTime.UtcNow)
{
t = DateTime.UtcNow;
}
_context.Response.Headers[HeaderNames.LastModified] = t.ToUniversalTime().ToString("r");
}
if (maxAge.HasValue)
{
_cacheHeaders.MaxAge = maxAge.Value;
writeCacheControlHeader = true;
}
if (writeCacheControlHeader)
{
_context.Response.Headers[HeaderNames.CacheControl] = _cacheHeaders.ToString();
}
}
catch (Exception ex)
{
SnLog.WriteException(ex,
"Exception in SetCacheControlHeaders. " +
$"httpCacheability:'{httpCacheability}' lastModified:'{lastModified}' maxAge:'{maxAge}'",
EventId.Portal);
}
}
/// <summary>
/// Gets a FilePathResult based on the file's path. It sets the mime type based on the file's extension.
/// </summary>
/// <param name="downloadFileName">If specified, the browser will not try to process the file directly (such as PDF files) and instead always opens the file download dialogue.</param>
protected async Task <ActionResult> File(Blob file,
string downloadFileName = null, CacheControlHeaderValue cacheControl = null, bool showInline = false)
{
if (cacheControl != null)
{
Response.Headers.Remove(Microsoft.Net.Http.Headers.HeaderNames.Pragma);
Response.Headers.Remove(Microsoft.Net.Http.Headers.HeaderNames.CacheControl);
Response.Headers.Add(Microsoft.Net.Http.Headers.HeaderNames.CacheControl, cacheControl.ToString());
}
var cd = new System.Net.Mime.ContentDisposition
{
FileName = downloadFileName.Or(file.FileName),
Inline = showInline,
};
if (showInline)
{
Response.Headers.Add("X-Content-Type-Options", "nosniff");
}
Response.Headers.Remove("Content-Disposition");
Response.Headers.Add(Microsoft.Net.Http.Headers.HeaderNames.ContentDisposition, cd.ToString());
return(File(await file.GetFileDataAsync(), file.GetMimeType()));
}
public static async Task <ActionResult> GenerateActionResult(ControllerBase controller, ICacheableDataProvider provider, TimeSpan?maxAge = null)
{
const string CacheControlHeaderKey = "Cache-Control";
const string IfNonMatchHeaderKey = "If-None-Match";
const string IfModifiedSinceHeaderKey = "If-Modified-Since";
const string ETagHeaderKey = "ETag";
const string LastModifiedHeaderKey = "Last-Modified";
string GenerateCacheControlHeaderValue()
{
var cacheControlHeader = new CacheControlHeaderValue()
{
NoCache = true,
NoStore = false,
MaxAge = maxAge ?? TimeSpan.FromDays(14),
Private = true,
MustRevalidate = true
};
return(cacheControlHeader.ToString());
}
var digest = await provider.GetDigest();
var eTagValue = $"\"{digest.ETag}\"";
var eTag = new EntityTagHeaderValue(eTagValue);
ActionResult Generate304Result()
{
controller.Response.Headers.Add(ETagHeaderKey, eTagValue);
controller.Response.Headers.Add(LastModifiedHeaderKey, digest.LastModified.ToString("R"));
controller.Response.Headers.Add(CacheControlHeaderKey, GenerateCacheControlHeaderValue());
return(controller.StatusCode(StatusCodes.Status304NotModified, null));
}
if (controller.Request.Headers.TryGetValue(IfNonMatchHeaderKey, out var ifNonMatchHeaderValue))
{
if (!EntityTagHeaderValue.TryParseList(ifNonMatchHeaderValue, out var eTagList))
{
return(controller.BadRequest(new CommonResponse(ErrorCodes.Common.Header.IfNonMatch_BadFormat, "Header If-None-Match is of bad format.")));
}
if (eTagList.FirstOrDefault(e => e.Equals(eTag)) != null)
{
return(Generate304Result());
}
}
else if (controller.Request.Headers.TryGetValue(IfModifiedSinceHeaderKey, out var ifModifiedSinceHeaderValue))
{
if (!DateTime.TryParse(ifModifiedSinceHeaderValue, out var headerValue))
{
return(controller.BadRequest(new CommonResponse(ErrorCodes.Common.Header.IfModifiedSince_BadFormat, "Header If-Modified-Since is of bad format.")));
}
if (headerValue > digest.LastModified)
{
return(Generate304Result());
}
}
var data = await provider.GetData();
controller.Response.Headers.Add(CacheControlHeaderKey, GenerateCacheControlHeaderValue());
return(controller.File(data.Data, data.ContentType, digest.LastModified, eTag));
}
public static string ToSafeString(this CacheControlHeaderValue cacheControl)
{
return(cacheControl == null ? "(null)" : cacheControl.ToString());
}
/// <summary>
/// Gets a FilePathResult based on the file's path. It sets the mime type based on the file's extension.
/// </summary>
/// <param name="downloadFileName">If specified, the browser will not try to process the file directly (such as PDF files) and instead always opens the file download dialogue.</param>
protected async Task <ActionResult> File(Blob file,
string downloadFileName = null, CacheControlHeaderValue cacheControl = null)
{
if (cacheControl != null)
{
Response.Headers.Remove(Microsoft.Net.Http.Headers.HeaderNames.Pragma);
Response.Headers.Remove(Microsoft.Net.Http.Headers.HeaderNames.CacheControl);
Response.Headers.Add(Microsoft.Net.Http.Headers.HeaderNames.CacheControl, cacheControl.ToString());
}
return(File(await file.GetFileDataAsync(), file.GetMimeType(), downloadFileName.Or(file.FileName)));
}
private static async Task InitializeAWSStorageAsync(IServiceProvider services, AWSS3StorageImageProviderOptions options)
{
// Upload an image to the AWS Test Storage;
AWSS3BucketClientOptions bucketOptions = options.S3Buckets.First();
AmazonS3Client amazonS3Client = AmazonS3ClientFactory.CreateClient(bucketOptions);
ListBucketsResponse listBucketsResponse = await amazonS3Client.ListBucketsAsync();
bool foundBucket = false;
foreach (S3Bucket b in listBucketsResponse.Buckets)
{
if (b.BucketName == bucketOptions.BucketName)
{
foundBucket = true;
break;
}
}
if (!foundBucket)
{
try
{
var putBucketRequest = new PutBucketRequest
{
BucketName = bucketOptions.BucketName,
BucketRegion = bucketOptions.Region,
CannedACL = S3CannedACL.PublicRead
};
await amazonS3Client.PutBucketAsync(putBucketRequest);
}
catch (AmazonS3Exception e)
{
// CI tests are run in parallel and can sometimes return a
// false negative for the existance of a bucket.
if (string.Equals(e.ErrorCode, "BucketAlreadyExists"))
{
return;
}
throw;
}
}
#if NETCOREAPP2_1
IHostingEnvironment environment = services.GetRequiredService <IHostingEnvironment>();
#else
IWebHostEnvironment environment = services.GetRequiredService <IWebHostEnvironment>();
#endif
try
{
GetObjectRequest request = new()
{
BucketName = bucketOptions.BucketName,
Key = TestConstants.ImagePath
};
await amazonS3Client.GetObjectAsync(request);
}
catch
{
IFileInfo file = environment.WebRootFileProvider.GetFileInfo(TestConstants.ImagePath);
using Stream stream = file.CreateReadStream();
// Set the max-age property so we get coverage for testing in our AWS provider.
var cacheControl = new CacheControlHeaderValue
{
Public = true,
MaxAge = TimeSpan.FromDays(7),
MustRevalidate = true
};
var putRequest = new PutObjectRequest()
{
BucketName = bucketOptions.BucketName,
Key = TestConstants.ImagePath,
Headers =
{
CacheControl = cacheControl.ToString()
},
ContentType = " image/png",
InputStream = stream
};
await amazonS3Client.PutObjectAsync(putRequest);
}
}
