AzureStorageWrapper

AzureStorageWrapper it's a wrapper for Azure Storage blob service, aimed at simplifying the file upload process and obtaining links for downloading them.

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Usage

Dependency injection

To add AzureStorageWrapper to dependencies container, just use the method AddAzureStorageWrapper(...)

public void ConfigureServices(IServiceCollection serviceCollection)
{
    serviceCollection.AddAzureStorageWrapper(configuration =>
    {
        configuration.ConnectionString = "azure-storage-connection-string"
        configuration.MaxSasUriExpiration = 600;
        configuration.DefaultSasUriExpiration = 300;
        configuration.CreateContainerIfNotExists = true;
    });
}

These are the main properties:

• ConnectionString: The connection string of your Azure Storage Account. You can export by following this document
• MaxSasUriExpiration: You can set a maximum duration value for the Shared Access Signature (SAS) of an Azure Storage file to prevent someone from attempting to generate a token with a longer expiration time. Expressed in seconds.
• DefaultSasUriExpiration: You can download a file using AzureStorageWrapper without specifying the ExpiresIn property. By doing so, this value will be automatically set. Expressed in seconds
• CreateContainerIfNotExists: When uploading a file to Azure Storage, you need to specify the container, which may not exist and can be created automatically. You can set it to true or false based on your requirements. Please consider this property if you have automated your infrastructure with any Infrastructure as Code (IaC) mechanism because it affects the state of your infrastructure.

Then you can inject IAzureStorageWrapper into your services through constructor:

public class MyService
{
    private IAzureStorageWrapper _storageWrapper;

    public MyService(IAzureStorageWrapper storageWrapper)
    {
        _storageWrapper = storageWrapper;
    }
}

Upload blobs

There are 3 options to upload blobs, all the ways follow the same pattern:

• You need to specify the file name and extension.
• You need to specify the container where you want to store the file.
• You can add additional metadata with relevant information.

The file will be placed in Base64, Bytes or Stream property.

Base64

var base64 = "SGVsbG8g8J+Zgg==";

var command = new UploadBase64()
{
    Base64 = base64,
    Container = "files",
    Name = "hello",
    Extension = "md",
    Metadata = new Dictionary<string, string>() { {"key", "value"} }
};

var response = await _azureStorageWrapper.UploadBlobAsync(command);

Byte []

var bytes = Convert.FromBase64String("SGVsbG8g8J+Zgg==");

var command = new UploadBytes()
{
    Bytes = bytes,
    Container = "files",
    Name = "hello",
    Extension = "md",
    Metadata = new Dictionary<string, string>() { {"key", "value"} }
};

var response = await _azureStorageWrapper.UploadBlobAsync(command);

Stream

var stream = new MemoryStream(Convert.FromBase64String("SGVsbG8g8J+Zgg=="));

var command = new UploadStream()
{
    Stream = stream,
    Container = "files",
    Name = "hello",
    Extension = "md",
    Metadata = new Dictionary<string, string>() { {"key", "value"} }
};

var response = await _azureStorageWrapper.UploadBlobAsync(command);

Response after upload blobs

Regardless of the chosen upload mechanism, you will always receive this response after upload a file.

public class BlobReference
{
    public string Container { get; set; }
    public string Name { get; set; }
    public string Extension { get; set; }
    public string Uri { get; set; }
    public string SasUri { get; set; }
    public DateTime SasExpires { get; set; }
    public IDictionary<string, string> Metadata { get; set; }
}

In example, if you upload the file hello.md file to container files you will receive a response like:

{
    "Container": "files",
    "Name": "hello",
    "Extension": "md",
    "Uri": "https://accountName.blob.core.windows.net/files/5a19306fc5014a4/hello.md",
    "SasUri": "https://accountName.blob.core.windows.net/files/5a19306fc5014a4/hello.md?sv=2021-10-04\u0026se=2023-09-03T16%3A17%3A02Z\u0026sr=b\u0026sp=r\u0026sig=8hs8AzxABevSTc5y%2BhOWDDN%2FH5qFSpA8Omj4uqoxzms%3D",
    "SasExpires": "2023-09-03T16:17:02.8220993Z",
    "Metadata": {
        "key": "value",
        "_timestamp": "03/09/2023 16:11:02"
    }
}

It is your responsibility to save the reference (URI property) of the file you have uploaded to Azure Storage somewhere, as you will need it for later downloads.

Virtual Folders

The upload commands have a property called UseVirtualFolder which by default has a value of true but you can set it to false if you wish.

Be careful. If you make that change, the files will NOT be saved in virtual directories, and file names may collide, causing files to be overwritten.

In this case, you must be responsible for establishing your own mechanism to generate unique file names.

var base64 = "SGVsbG8g8J+Zgg==";

var command = new UploadBase64()
{
    Base64 = base64,
    Container = "files",
    Name = "hello",
    Extension = "md",
    UseVirtualFolder = false // be careful!
};

var response = await _azureStorageWrapper.UploadBlobAsync(command);

Download blobs

To download a blob reference, you need specify the Uri.

var command = new DownloadBlobReference()
{
    Uri = "https://accountName.blob.core.windows.net/files/5a19306fc5014a4/hello.md"
    ExpiresIn = 60,
};

var response = await _azureStorageWrapper.DownloadBlobReferenceAsync(command);

The response when downloading file reference resembles the response when uploading files:

{
    "Container": "files",
    "Name": "hello",
    "Extension": "md",
    "Uri": "https://accountName.blob.core.windows.net/files/5a19306fc5014a4/hello.md",
    "SasUri": "https://accountName.blob.core.windows.net/files/5a19306fc5014a4/hello.md?sv=2021-10-04\u0026se=2023-09-03T16%3A17%3A02Z\u0026sr=b\u0026sp=r\u0026sig=8hs8AzxABevSTc5y%2BhOWDDN%2FH5qFSpA8Omj4uqoxzms%3D",
    "SasExpires": "2023-09-03T16:17:02.8220993Z",
    "Metadata": {
        "_timestamp": "03/09/2023 16:11:02"
    }
}

Delete blobs

You can delete a blob by specifying the Uri.

var command = new DeleteBlob()
{
    Uri = "https://accountName.blob.core.windows.net/files/5a19306fc5014a4/hello.md"
};

await _azureStorageWrapper.DeleteBlobAsync(command);

Enumerate blobs

You can list all blobs in a container by using the method EnumerateAllBlobsAsync or paginate the results by using EnumerateBlobsAsync method. The second one requires the Size property to be set.

In both cases, the response BlobReferenceCollection will contain a collection of BlobReference elements.

Without pagination

var command = new EnumerateAllBlobs()
{
    Container = "files"
};

var response = await _azureStorageWrapper.EnumerateAllBlobsAsync(command);

With pagination

var command = new EnumerateBlobs()
{
    Container = "files"
    Size = 10,
};

var response = await _azureStorageWrapper.EnumerateBlobsAsync(command);

Then you can request additional pages by using the ContinuationToken property in the next request.

var firstCommand = new EnumerateBlobs()
{
    Container = "files"
    Size = 10,
};

var firstResponse = await _azureStorageWrapper.EnumerateBlobsAsync(firstCommand);

var secondCommand = new EnumerateBlobs()
{
    Container = "files"
    Size = 10,
    ContinuationToken = firstResponse.ContinuationToken
};

var secondResponse = await _azureStorageWrapper.EnumerateBlobsAsync(secondCommand);

Contributors / Collaborators

These individuals have contributed to the repository through suggestions, error corrections, or by opening issues. Thanks 😊

• ginodcs
• christian-cell

Sponsor

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Support

You can contact me via Twitter @sergiobarriel, or if you have an issue, you can open one 🙂