private static async Task <string> GetOrCreateSasDefinitionAsync(
ManagedStorageRestClient storageClient,
string storageAccountName,
string sasTemplate,
int days,
bool readOnly)
{
const string Tag = "ShareLinkSample";
// Format the duration using ISO 8601.
string duration = days > 0 ? XmlConvert.ToString(TimeSpan.FromDays(days)) : null;
// Try to find an existing definition based on the template and duration, since the formatted name may have changed.
for (SasDefinitionListResult result = await storageClient.GetSasDefinitionsAsync(storageAccountName, cancellationToken: s_cancellationTokenSource.Token); ;
result = await storageClient.GetSasDefinitionsNextPageAsync(result.NextLink, storageAccountName, cancellationToken: s_cancellationTokenSource.Token))
{
foreach (SasDefinitionItem sasDefinitionInfo in result.Value.Where(d => d.Tags.ContainsKey(Tag)))
{
// The SAS definition name is the segment of the Id.
int pos = sasDefinitionInfo.Id.AsSpan().TrimEnd('/').LastIndexOf('/');
string name = sasDefinitionInfo.Id.Substring(pos + 1);
SasDefinitionBundle foundSasDefinition = await storageClient.GetSasDefinitionAsync(storageAccountName, name, cancellationToken : s_cancellationTokenSource.Token);
if (string.Equals(sasTemplate, foundSasDefinition.TemplateUri, StringComparison.OrdinalIgnoreCase) &&
string.Equals(duration, foundSasDefinition.ValidityPeriod, StringComparison.OrdinalIgnoreCase))
{
return(name);
}
}
if (result.NextLink is null)
{
// No more results.
break;
}
}
// Create a new SAS definition since we didn't find an existing definition.
string sasDefinitionName = BuildSasDefinitionName(Tag, readOnly, duration);
SasDefinitionAttributes sasDefinitionAttributes = new SasDefinitionAttributes
{
Enabled = true,
};
Dictionary <string, string> tags = new Dictionary <string, string>
{
[Tag] = "1",
};
SasDefinitionBundle createdSasDefinition = await storageClient.SetSasDefinitionAsync(
storageAccountName,
sasDefinitionName,
sasTemplate,
SasTokenType.Account,
duration,
sasDefinitionAttributes,
tags,
s_cancellationTokenSource.Token);
return(sasDefinitionName);
}
