/// <summary>
/// This will return the cache file path for a given IWebFile depending on if it's being watched
/// </summary>
/// <param name="file"></param>
/// <param name="fileWatchEnabled"></param>
/// <param name="extension"></param>
/// <param name="cacheBuster"></param>
/// <param name="fileInfo">
/// A getter to the underlying IFileInfo, this is lazy because when file watching is not enabled we do not want to resolve
/// this if the cache file already exists
/// </param>
/// <returns></returns>
public string GetCacheFilePath(IWebFile file, bool fileWatchEnabled, string extension, ICacheBuster cacheBuster, out Lazy <IFileInfo> fileInfo)
{
string cacheDir;
string cacheFile;
if (fileWatchEnabled)
{
//When file watching, the file path will be different since we'll hash twice:
// * Hash normally, since this will be a static hash of the file name
// * Hash with timestamp since this will be how we change it
// This allows us to lookup the file's folder to store it's timestamped processed files
var fi = GetFileInfo(file);
//get the file hash without the extension
var fileHash = GetFileHash(file, string.Empty);
var timestampedHash = GetFileHash(file, fi, extension);
cacheDir = Path.Combine(CurrentCacheFolder, cacheBuster.GetValue(), fileHash);
cacheFile = Path.Combine(cacheDir, timestampedHash);
fileInfo = new Lazy <IFileInfo>(() => fi, LazyThreadSafetyMode.None);
}
else
{
var fileHash = GetFileHash(file, extension);
cacheDir = Path.Combine(CurrentCacheFolder, cacheBuster.GetValue());
cacheFile = Path.Combine(cacheDir, fileHash);
fileInfo = new Lazy <IFileInfo>(() => GetFileInfo(file), LazyThreadSafetyMode.None);
}
//ensure the folder exists
Directory.CreateDirectory(cacheDir);
return(cacheFile);
}
public string GetUrl(string bundleName, string fileExtension, bool debug, ICacheBuster cacheBuster)
{
if (cacheBuster == null)
{
throw new ArgumentNullException(nameof(cacheBuster));
}
const string handler = "~/{0}/{1}{2}.{3}{4}";
return(_requestHelper.Content(
string.Format(
handler,
_options.BundleFilePath,
Uri.EscapeUriString(bundleName),
fileExtension,
debug ? 'd' : 'v',
cacheBuster.GetValue())));
}
/// <summary>
/// Returns the cache folder for composite files for the current compression supported
/// </summary>
/// <returns></returns>
public string GetCurrentCompositeFolder(ICacheBuster cacheBuster, CompressionType type)
{
return(Path.Combine(CurrentCacheFolder, cacheBuster.GetValue(), type.ToString()));
}
public IEnumerable <FileSetUrl> GetUrls(IEnumerable <IWebFile> dependencies, string fileExtension, ICacheBuster cacheBuster)
{
if (cacheBuster == null)
{
throw new ArgumentNullException(nameof(cacheBuster));
}
var files = new List <FileSetUrl>();
var currBuilder = new StringBuilder();
var delimitedBuilder = new StringBuilder();
var builderCount = 1;
var remaining = new Queue <IWebFile>(dependencies);
while (remaining.Any())
{
var current = remaining.Peek();
//add the normal file path (generally this would already be hashed)
delimitedBuilder.Append(current.FilePath.TrimExtension(fileExtension).EnsureEndsWith('.'));
//test if the current string exceeds the max length, if so we need to split
if ((delimitedBuilder.Length
+ _options.CompositeFilePath.Length
+ fileExtension.Length
+ cacheBuster.GetValue().Length
//this number deals with slashes, etc...
+ 10)
>= (_options.MaxUrlLength))
{
//we need to do a check here, this is the first one and it's already exceeded the max length we cannot continue
if (currBuilder.Length == 0)
{
throw new InvalidOperationException("The path for the single dependency: '" + current.FilePath.TrimExtension(fileExtension) + "' exceeds the max length (" + _options.MaxUrlLength + "), either reduce the single dependency's path length or increase the MaxHandlerUrlLength value");
}
//flush the current output to the array
var output = currBuilder.ToString().TrimEnd('.');
files.Add(new FileSetUrl
{
Key = _hasher.Hash(output),
Url = GetCompositeUrl(output, fileExtension, cacheBuster)
});
//create some new output
currBuilder = new StringBuilder();
delimitedBuilder = new StringBuilder();
builderCount++;
}
else
{
//update the normal builder
currBuilder.Append(current.FilePath.TrimExtension(fileExtension).EnsureEndsWith('.'));
//remove from the queue
remaining.Dequeue();
}
}
if (builderCount > files.Count)
{
//flush the remaining output to the array
var output = currBuilder.ToString().TrimEnd('.');
files.Add(new FileSetUrl
{
Key = _hasher.Hash(output),
Url = GetCompositeUrl(output, fileExtension, cacheBuster)
});
}
return(files.ToArray());
}