public static IBlobPathSource Create(string pattern)
{
if (pattern == null)
{
throw new FormatException("Blob paths must not be null.");
}
int slashIndex = pattern.IndexOf('/');
bool hasBlobName = slashIndex != -1;
string containerNamePattern = pattern;
string blobNamePattern = String.Empty;
if (hasBlobName)
{
containerNamePattern = pattern.Substring(0, slashIndex);
blobNamePattern = pattern.Substring(slashIndex + 1);
}
// There must be at least one character before the slash and one character after the slash.
bool hasNonEmptyBlobAndContainerNames = slashIndex > 0 && slashIndex < pattern.Length - 1;
if ((hasBlobName && !hasNonEmptyBlobAndContainerNames) || containerNamePattern.Contains('\\'))
{
throw new FormatException($"Invalid blob trigger path '{pattern}'. Paths must be in the format 'container/blob'.");
}
else if (containerNamePattern.Contains('{'))
{
throw new FormatException($"Invalid blob trigger path '{pattern}'. Container paths cannot contain {{resolve}} tokens.");
}
BindingTemplateSource template = BindingTemplateSource.FromString(pattern);
if (template.ParameterNames.Count() > 0)
{
return(new ParameterizedBlobPathSource(containerNamePattern, blobNamePattern, template));
}
BlobClientExtensions.ValidateContainerName(containerNamePattern);
if (hasBlobName)
{
BlobClientExtensions.ValidateBlobName(blobNamePattern);
}
return(new FixedBlobPathSource(new BlobPath(containerNamePattern, blobNamePattern)));
}
private static bool TryParseAndValidate(string value, out string errorMessage, out BlobPath path, bool isContainerBinding = false)
{
BlobPath possiblePath;
if (!isContainerBinding && TryParseAbsUrl(value, out possiblePath))
{
path = possiblePath;
errorMessage = null;
return(true);
}
if (!TryParse(value, isContainerBinding, out possiblePath))
{
errorMessage = $"Invalid blob path specified : '{value}'. Blob identifiers must be in the format 'container/blob'.";
path = null;
return(false);
}
if (!BlobClientExtensions.IsValidContainerName(possiblePath.ContainerName))
{
errorMessage = "Invalid container name: " + possiblePath.ContainerName;
path = null;
return(false);
}
// for container bindings, we allow an empty blob name/path
string possibleErrorMessage;
if (!(isContainerBinding && string.IsNullOrEmpty(possiblePath.BlobName)) &&
!BlobClientExtensions.IsValidBlobName(possiblePath.BlobName, out possibleErrorMessage))
{
errorMessage = possibleErrorMessage;
path = null;
return(false);
}
errorMessage = null;
path = possiblePath;
return(true);
}
