/// <summary>
/// Generates the URIs that a client can use to upload images to the storage system
/// </summary>
/// <param name="entrantId">The entrant that is being uploaded</param>
/// <param name="generateDisplayUri">Controls the generation of the displayUploadUri</param>
/// <param name="verifyContainerName">The name of the blob container for verification images. Default: 'photos-verification'</param>
/// <param name="displayContainerName">The name of the blob container for verification images. Default: 'photos-display'</param>
/// <returns></returns>
public async Task <(Uri verifyUploadUri, Uri?displayUploadUri)> GenerateImageUploadUris(string entrantId,
bool generateDisplayUri, string verifyContainerName = "photos-verification",
string displayContainerName = "photos-display")
{
if (string.IsNullOrWhiteSpace(entrantId))
{
throw new ArgumentNullException(nameof(entrantId));
}
//Generate containers
var blobClient = new BlobContainerClient(_storageAccount.ToString(true), displayContainerName);
await blobClient.CreateIfNotExistsAsync(PublicAccessType.Blob).ConfigureAwait(false);
blobClient = new BlobContainerClient(_storageAccount.ToString(true), verifyContainerName);
await blobClient.CreateIfNotExistsAsync(PublicAccessType.None).ConfigureAwait(false);
var sasBuilder = new BlobSasBuilder
{
BlobContainerName = verifyContainerName,
BlobName = entrantId,
Resource = @"b",
ExpiresOn = DateTimeOffset.UtcNow.AddMinutes(5)
};
//Sets the permissions for the SAS token
sasBuilder.SetPermissions(BlobSasPermissions.Create | BlobSasPermissions.Write | BlobSasPermissions.Delete);
var credentials = new StorageSharedKeyCredential(_storageAccount.Credentials.AccountName,
_storageAccount.Credentials.ExportBase64EncodedKey());
//The constructed sas token
var verifyUploadSas = sasBuilder.ToSasQueryParameters(credentials);
//Uri builder for verify blob
var builder = new BlobUriBuilder(_storageAccount.BlobEndpoint)
{
BlobName = entrantId,
BlobContainerName = verifyContainerName,
AccountName = _storageAccount.Credentials.AccountName,
Sas = verifyUploadSas
};
var verifyUploadUri = builder.ToUri();
sasBuilder.BlobContainerName = displayContainerName;
builder.BlobContainerName = displayContainerName;
if (generateDisplayUri)
{
builder.Sas = sasBuilder.ToSasQueryParameters(credentials);
var displayUploadUri = builder.ToUri();
return(verifyUploadUri, displayUploadUri);
}
return(verifyUploadUri, null);
}
public async Task <IActionResult> Create([Bind("Id,FirstName,LastName,Image")] InstructorVM instructor)
{
CloudStorageAccount account = CloudStorageAccount.Parse(storageConnection.ToString());
CloudBlobClient serviceClient = account.CreateCloudBlobClient();
// Create container. Name must be lower case.
Console.WriteLine("Creating container...");
var container = serviceClient.GetContainerReference("instructor-images");
container.CreateIfNotExistsAsync().Wait();
// write a blob to the container
CloudBlockBlob blob = container.GetBlockBlobReference("helloworld.txt");
using (var memoryStream = new MemoryStream())
{
await instructor.Image.CopyToAsync(memoryStream);
await blob.UploadFromStreamAsync(memoryStream);
if (ModelState.IsValid)
{
await _instructorsService.AddInstructorAsync(new InstructorRequest
{
FirstName = instructor.FirstName,
LastName = instructor.LastName
});
return(RedirectToAction(nameof(Index)));
}
}
return(View(instructor));
}
