internal static string CreateOutputCachedItemKey(
string path,
CacheRequestMethod method,
HttpContext context,
CachedVary cachedVary)
{
StringBuilder sb;
int i, j, n;
string name, value;
string[] a;
byte[] buf, hash;
HttpRequest request;
NameValueCollection col;
int contentLength;
if (method == CacheRequestMethod.Post)
{
sb = new StringBuilder("System.Web.Http.HttpRawResponse\nM=3\n");
}
else
{
sb = new StringBuilder("System.Web.Http.HttpRawResponse\nM=2\n");
}
sb.Append(CultureInfo.InvariantCulture.TextInfo.ToLower(path));
/* key for cached vary item has additional information */
if (cachedVary != null)
{
request = context.Request;
/* params part */
for (j = 0; j <= 2; j++)
{
switch (j)
{
case 0:
sb.Append("\nVH");
a = cachedVary._headers;
col = request.ServerVariables;
break;
case 1:
sb.Append("\nVPQ");
a = cachedVary._params;
col = request.QueryString;
break;
case 2:
default:
sb.Append("\nVPF");
a = cachedVary._params;
col = request.Form;
if (method != CacheRequestMethod.Post)
{
col = null;
}
break;
}
if (col == null)
{
continue;
}
/* handle all params case (VaryByParams[*] = true) */
if (a == null && cachedVary._varyByAllParams && j != 0)
{
a = col.AllKeys;
for (i = a.Length - 1; i >= 0; i--)
{
if (a[i] != null)
{
a[i] = CultureInfo.InvariantCulture.TextInfo.ToLower(a[i]);
}
}
Array.Sort(a, InvariantComparer.Default);
}
if (a != null)
{
for (i = 0, n = a.Length; i < n; i++)
{
name = a[i];
value = col[name];
if (value == null)
{
value = NULL_VARYBY_VALUE;
}
sb.Append("\tPN:");
sb.Append(name);
sb.Append("\tPV:");
sb.Append(value);
}
}
}
/* custom string part */
sb.Append("\nVC");
if (cachedVary._varyByCustom != null)
{
sb.Append("\tCN:");
sb.Append(cachedVary._varyByCustom);
sb.Append("\tCV:");
try {
value = context.ApplicationInstance.GetVaryByCustomString(
context, cachedVary._varyByCustom);
if (value == null)
{
value = NULL_VARYBY_VALUE;
}
}
catch (Exception e) {
value = ERROR_VARYBY_VALUE;
HttpApplicationFactory.RaiseError(e);
}
sb.Append(value);
}
/*
* if VaryByParms=*, and method is not a form, then
* use a cryptographically strong hash of the data as
* part of the key.
*/
sb.Append("\nVPD");
if (method == CacheRequestMethod.Post &&
cachedVary._varyByAllParams &&
request.Form.Count == 0)
{
contentLength = request.ContentLength;
if (contentLength > MAX_POST_KEY_LENGTH || contentLength < 0)
{
return(null);
}
if (contentLength > 0)
{
buf = ((HttpInputStream)request.InputStream).Data;
if (buf == null)
{
return(null);
}
hash = MachineKey.HashData(buf, s_hashModifier, 0, buf.Length);
value = Convert.ToBase64String(hash);
sb.Append(value);
}
}
sb.Append("\nEOV");
}
return(sb.ToString());
}