/// <summary>Create and Initialize PersistentOnlyCacheManager instance with parameters.</summary>
/// <param name="disableEncryption">if true, cached files will not be encrypted/decrypted to/from persistent storage.</param>
/// <param name="encryptionKey">encryption key with which cache files will be encrypted/decrypted.</param>
/// <returns>PersistentOnlyCacheManager instance</returns>
internal static PersistentOnlyCacheManager CreateInstance(bool disableEncryption, byte[] encryptionKey)
{
lock (typeof(PersistentOnlyCacheManager))
{
if (_instance == null)
{
_instance = new PersistentOnlyCacheManager(disableEncryption, encryptionKey);
}
}
return(_instance);
}
/// <summary>
/// Create empty (not initialized) instance of PersistentOnlyCacheManager.
/// This instance should be used for accessing the HTTP/cache manager functionality in case the execution properties are not yet known
/// (and therefore cannot be used to initialize the cache manager) - currently the only such special case is accessing the publish.html file(ClickOnce),
/// yet this CreateInstance and empty CTOR are not and should not be specific to ClickOnce in any way.
/// </summary>
/// <returns>PersistentOnlyCacheManager instance</returns>
internal static PersistentOnlyCacheManager CreateInstance()
{
lock (typeof(PersistentOnlyCacheManager))
{
if (_instance == null)
{
_instance = new PersistentOnlyCacheManager();
}
}
return(_instance);
}
/// <summary>
/// return (using the two 'out' parameters) the server-side and client-side file names for a given request to retrieve a cached file.
/// </summary>
/// <param name="completeCachedFileRetrievalURL">complete cached file retrieval request (including the server-side time stamp),
/// e.g. http://[server]/[requester]?CTX=&CACHE=MG1VAI3T_MP_0$$$_$_$_N02400$$$$G8FM01_.xml|31/07/2013%2020:15:15</param>
/// <param name="cachedFileServerFileName">the cached file name on the server, e.g. MG1VAI3T_MP_0$$$_$_$_N02400$$$$G8FM01_.xml</param>
/// <param name="cachedFileLocalFileName">the cached file name in the client, e.g. C:\Users\[user]\AppData\Local\Temp\MgxpaRIACache\[server]\MG1VAI3T_MP_0$$$_$_$_N02400$$$$G8FM01_.xml</param>
internal void CompleteCacheRequestURLToFileNames(string completeCachedFileRetrievalURL,
out string cachedFileServerFileName,
out string cachedFileLocalFileName)
{
// discard the time stamp, leaving only 'cachedFileRetrievalURL', e.g.
string[] urlAndRemoteTimePair = HttpUtility.UrlDecode(completeCachedFileRetrievalURL, Encoding.UTF8).Split('|');
String cachedFileRetrievalURL = urlAndRemoteTimePair[0]; // the cached file retrieval request without the timestamp, e.g. http://[server]/[requester]?CTX=&CACHE=MG1VAI3T_MP_0$$$_$_$_N02400$$$$G8FM01_.xml
// get 'cachedFileServerFileName' (i.e. server-side, see the example in the method's comment) from 'cachedFileRetrievalURL', e.g.
const string precedingString = "&" + ConstInterface.RC_TOKEN_CACHED_FILE;
int pathStartIndex = cachedFileRetrievalURL.IndexOf(precedingString) + precedingString.Length;
cachedFileServerFileName = cachedFileRetrievalURL.Substring(pathStartIndex);
Debug.Assert(cachedFileServerFileName != null);
// get 'cachedFileLocalFileName' (i.e. client-side, see the example in the method's comment) from 'cachedFileRetrievalURL'
cachedFileLocalFileName = PersistentOnlyCacheManager.GetInstance().URLToLocalFileName(CacheUtils.URLToFileName(cachedFileRetrievalURL));
}
/// <summary>
/// </summary>
internal static void DeleteInstance()
{
_instance = null;
}
/// <summary>convert an HTTP URL to a file name in the cache</summary>
/// <param name="url"></param>
internal static String URLToLocalFileName(String url)
{
String relativeFileName = URLToFileName(HttpUtility.UrlDecode(url, Encoding.UTF8));
return(PersistentOnlyCacheManager.GetInstance().URLToLocalFileName(relativeFileName));
}
/// <summary> Converts a server file path into the local cached file path
/// eg. c:\serverfiles\a.jpg --> <cached folder>\c__serverfiles_a.jpg
/// </summary>
/// <param name="serverFileName"></param>
/// <returns></returns>
internal static String ServerFileToLocalFileName(String serverFileName)
{
String fileName = ServerFilePathToFileName(serverFileName);
return(PersistentOnlyCacheManager.GetInstance().URLToLocalFileName(fileName));
}
