Combining two functions to generate token and read blob file content

I'm new to c#, as I'm working on developing Azure function to generate SAS token, and reading and modifying .docx blob file.

I have these two functions below to do the 2 tasks. However, I want to integrate them into one function. I've tried to do so, but there's something missing I couldn't understand.

[FunctionName("SasTokenFunction")]
public static async Task<IActionResult> Run([HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req)
{

	string connectionString = Environment.GetEnvironmentVariable("AzureStorage");
	CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
	CloudBlobClient client = storageAccount.CreateCloudBlobClient();
	CloudBlobContainer container = client.GetContainerReference("formsample");

	SharedAccessBlobPolicy accessPolicy = new SharedAccessBlobPolicy
	{
		SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(30),
		Permissions = SharedAccessBlobPermissions.Write | SharedAccessBlobPermissions.Read
	};

	string sasUriToken = $"{container.Uri}{container.GetSharedAccessSignature(accessPolicy)}";

	// return the SAS Token to the client app
	GetUserDelegationSasBlobwithcontent();
	return (ActionResult)new OkObjectResult(sasUriToken);

}

public static async void GetUserDelegationSasBlobwithcontent()
{

	string storageAccountUriString = $"https://formsample5.blob.core.windows.net";
	var credential = new DefaultAzureCredential();

	BlobServiceClient blobServiceClient = new BlobServiceClient(new Uri(storageAccountUriString), credential);
	UserDelegationKey userDelegationKey = blobServiceClient.GetUserDelegationKey(DateTimeOffset.UtcNow, DateTimeOffset.UtcNow.AddDays(1));
	BlobContainerClient blobContainerClient = blobServiceClient.GetBlobContainerClient("sample");  //container name
	BlobClient blobClient = blobContainerClient.GetBlobClient("Sample.docx");


	// Get a user delegation key 
	var sasBuilder = new BlobSasBuilder()
	{
		BlobContainerName = blobClient.BlobContainerName,
		BlobName = blobClient.Name,
		Resource = "b", // b for blob, c for container
		StartsOn = DateTimeOffset.UtcNow,
		ExpiresOn = DateTimeOffset.UtcNow.AddHours(4),
	};
	sasBuilder.SetPermissions(BlobSasPermissions.Read | BlobSasPermissions.Write); // read permissions

	string sasToken = sasBuilder.ToSasQueryParameters(userDelegationKey, blobServiceClient.AccountName).ToString();
	Console.WriteLine("SAS-Token {0}", sasToken);

	Uri blobUri = new Uri(blobClient.Uri + "?" + sasToken);
	BlobClient sasBlobClient = new BlobClient(blobUri);
	BlobDownloadInfo download = sasBlobClient.Download();
	var content = download.Content;
	using (var streamReader = new StreamReader(content))
	{
		while (!streamReader.EndOfStream)
		{
			string line = await streamReader.ReadLineAsync();
			Console.WriteLine("\nBlob-contents:{0}", line);
		}
	}
}

Thanks to Peter Csala for the comments.
>To combine the two functions, you need to modify the return type of the GetUserDelegationSasBlobwithcontent() function to return the content of the blob file as a string or byte array. Then you can call this function inside the Run() function and pass the SAS token as a parameter to the GetUserDelegationSasBlobwithcontent() function.

To integrate the two functions into one, you can modify the GetUserDelegationSasBlobwithcontent function to return the contents of the blob file.
And you can call this function in the SasTokenFunction and return the result to the client app.

 string blobContent = await GetUserDelegationSasBlobwithcontent(sasUriToken);
 public static async Task<string> GetUserDelegationSasBlobwithcontent(string sasToken)
 {
 .
 .
 }

The below namespaces need to be used in the code.

using Microsoft.WindowsAzure.Storage.Blob;
using Microsoft.WindowsAzure.Storage;
using Azure.Storage.Blobs;
using Azure.Identity;
using Azure.Storage.Blobs.Models;
using Azure.Storage.Sas;

I used the code and able to fetch the token.

public static class Function1
    {
        [FunctionName("SasTokenFunction")]
        public static async Task<IActionResult> Run([HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req)
        {

            string connectionString = Environment.GetEnvironmentVariable("AzureStorage");
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
            CloudBlobClient client = storageAccount.CreateCloudBlobClient();
            CloudBlobContainer container = client.GetContainerReference("samplecontainer");

            SharedAccessBlobPolicy accessPolicy = new SharedAccessBlobPolicy
            {
                SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(30),
                Permissions = SharedAccessBlobPermissions.Write | SharedAccessBlobPermissions.Read
            };

            string sasUriToken = $"{container.Uri}{container.GetSharedAccessSignature(accessPolicy)}";

            string blobContent = await GetUserDelegationSasBlobwithcontent(sasUriToken);


            return (ActionResult)new OkObjectResult(sasUriToken);
        }

        public static async Task<string> GetUserDelegationSasBlobwithcontent(string sasToken)
        {
            string storageAccountUriString = $"https://formsample5.blob.core.windows.net";
            var credential = new DefaultAzureCredential();

            BlobServiceClient blobServiceClient = new BlobServiceClient(new Uri(storageAccountUriString), credential);
            UserDelegationKey userDelegationKey = blobServiceClient.GetUserDelegationKey(DateTimeOffset.UtcNow, DateTimeOffset.UtcNow.AddDays(1));
            BlobContainerClient blobContainerClient = blobServiceClient.GetBlobContainerClient("sample");  //container name
            BlobClient blobClient = blobContainerClient.GetBlobClient("Sample.docx");

            Uri blobUri = new Uri(blobClient.Uri + "?" + sasToken);
            BlobClient sasBlobClient = new BlobClient(blobUri);
            BlobDownloadInfo download = sasBlobClient.Download();
            var content = download.Content;

            using (var streamReader = new StreamReader(content))
            {
                string blobContent = await streamReader.ReadToEndAsync();
                return blobContent;
            }
        }
    }

Token generation

Sample code to fetch the SAS token.

const string ConnectionString = "DefaultEndpointsProtocol=https;AccountName=<storage-account>;AccountKey=<account-key>";
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(ConnectionString);
            SharedAccessAccountPolicy policy = new SharedAccessAccountPolicy()
            {
                Permissions = SharedAccessAccountPermissions.Read |
                                  SharedAccessAccountPermissions.Write |
                                  SharedAccessAccountPermissions.List,
                Services = SharedAccessAccountServices.Blob | SharedAccessAccountServices.File,
                ResourceTypes = SharedAccessAccountResourceTypes.Service,
                SharedAccessExpiryTime = DateTime.UtcNow.AddHours(24),
                Protocols = SharedAccessProtocol.HttpsOnly
            };

            return storageAccount.GetSharedAccessSignature(policy);

For further information on this, refer to MSDoc.