/// <summary>
/// Cleans identifiers from an absolute path, and optionally removes the provided prefix
/// </summary>
/// <param name="absolutePath">The path to clean</param>
/// <param name="virtualPathToRemove">The optional virtual path to remove from the front of the path</param>
/// <returns>The cleaned path</returns>
public static string GetCleanUriPath(string absolutePath, string virtualPathToRemove)
{
if (string.IsNullOrWhiteSpace(absolutePath) || (absolutePath.Length == 1 && absolutePath[0] == '/'))
{
return(absolutePath);
}
if (!string.IsNullOrEmpty(virtualPathToRemove) && string.Equals(absolutePath, virtualPathToRemove))
{
return("/");
}
// If the virtual path is "/" then we're hosted at the root, so nothing to remove
// If not, it will be of the form "/myapp", so remove whole thing
// Make sure we only remove _whole_ segment i.e. /myapp/controller, but not /myappcontroller
var hasPrefix = !string.IsNullOrEmpty(virtualPathToRemove) &&
virtualPathToRemove != "/" &&
virtualPathToRemove[0] == '/' &&
absolutePath.StartsWith(virtualPathToRemove, StringComparison.OrdinalIgnoreCase) &&
absolutePath.Length > virtualPathToRemove.Length &&
absolutePath[virtualPathToRemove.Length] == '/';
// Sanitized url will be at worse as long as the original, minus a removed virtual path
var maxLength = absolutePath.Length - (hasPrefix ? virtualPathToRemove.Length : 0);
var sb = StringBuilderCache.Acquire(maxLength);
int previousIndex = hasPrefix ? virtualPathToRemove.Length : 0;
int index;
int segmentLength;
int indexOfFileExtension = 0;
do
{
index = absolutePath.IndexOf('/', previousIndex);
if (index == -1)
{
// Last segment
// Is this a filename with an extension?
if (absolutePath.Length > previousIndex &&
(indexOfFileExtension = absolutePath.LastIndexOf('.')) != -1 &&
indexOfFileExtension > previousIndex)
{
// Only try and clean the filename, excluding the file extension
segmentLength = indexOfFileExtension - previousIndex;
}
else
{
segmentLength = absolutePath.Length - previousIndex;
}
}
else
{
segmentLength = index - previousIndex;
}
if (IsIdentifierSegment(absolutePath, previousIndex, segmentLength))
{
sb.Append('?');
}
else
{
sb.Append(absolutePath, previousIndex, segmentLength);
}
if (index == -1)
{
if (segmentLength > 0 && indexOfFileExtension > previousIndex)
{
// add the file extension
sb.Append(absolutePath, indexOfFileExtension, absolutePath.Length - indexOfFileExtension);
}
}
else
{
sb.Append('/');
}
previousIndex = index + 1;
}while (index != -1);
return(StringBuilderCache.GetStringAndRelease(sb));
}
