/// <summary>
///
/// </summary>
/// <param name="httpContext"></param>
/// <param name="content"></param>
/// <returns></returns>
public byte[] RunOutputRules(HttpContextBase httpContext, byte[] content)
{
var context = new RuleSetContext(this, content, httpContext);
byte[] currentContent = content;
if (!EngineEnabled)
{
Manager.LogIf(!EngineEnabled && LogLevel >= 9, "Rewrite Engine Is DISABLED", "OutRewrite");
}
if (_outputRules.Count > 0 && EngineEnabled)
{
Manager.LogIf(LogLevel >= 1, "**********************************************************************************");
//Manager.LogIf(LogLevel >= 9, "Input: " + currentContent, "OutRewrite");
var temporyFlags = (IRuleFlagProcessor)null;
bool skipNextChain = false;
byte[] initialContent = currentContent;
// process rules according to their settings
for (int i = 0; i < _outputRules.Count; i++)
{
var ruleContext = new RuleContext(i, context, currentContent, _outputRules[i]);
temporyFlags = _outputRules[i].Flags;
bool containsChain = RuleFlagsProcessor.HasChain(_outputRules[i].Flags);
bool previousContainsChain = RuleFlagsProcessor.HasChain(_outputRules[Math.Max(0, i - 1)].Flags);
// if the previous rule doesn't contain a chain flag then set the initial URL
// this will be used to reset a chain if one of the chain rules fail
if (!previousContainsChain)
{
initialContent = currentContent;
}
// skip if the current rule or the last rule has a chain flag
// and if the skip next chain is set
if (skipNextChain && (previousContainsChain || containsChain))
{
continue;
}
else
{
skipNextChain = false;
}
if (_outputRules[i].TryExecute(ruleContext))
{
var flagResponse = temporyFlags.Apply(ruleContext);
currentContent = ruleContext.SubstitutedContent;
i = ruleContext.RuleIndex ?? -1;
bool breakLoop = false;
// apply the flags to the rules, and only do special processing
// for the flag responses listed in the switch statement below
switch (flagResponse)
{
case RuleFlagProcessorResponse.ExitRuleSet:
return(null);
case RuleFlagProcessorResponse.LastRule:
breakLoop = true;
break;
}
// break the loop because we have reached the last rule as indicated by a flag
if (breakLoop)
{
break;
}
}
else if (containsChain)
{
skipNextChain = true;
// reset the current URL back to the initial URL from the start of the chain
currentContent = initialContent;
}
else if (previousContainsChain)
{
// reset the current URL back to the initial URL from the start of the chain
currentContent = initialContent;
}
}
//Manager.LogIf(LogLevel >= 9, "Output: " + currentContent, "OutRewrite");
Manager.LogIf(LogLevel >= 1, "**********************************************************************************");
}
return(currentContent);
}
/// <summary>
/// Runs the rules.
/// </summary>
/// <param name="httpContext">The HTTP context.</param>
/// <param name="url">The URL.</param>
/// <returns>
/// Returns a rewritten <see cref="System.Uri"/>, or a value of <see langword="null"/> if no rewriting was done to <paramref name="url"/>.
/// </returns>
public Uri RunRules(HttpContextBase httpContext, Uri url)
{
var context = new RuleSetContext(this, url, httpContext);
var currentUrl = url;
if (!EngineEnabled)
{
Manager.LogIf(!EngineEnabled && LogLevel >= 9, "Rewrite Engine Is DISABLED", "Rewrite");
}
if (_rules.Count > 0 && EngineEnabled)
{
Manager.LogIf(LogLevel >= 1, "**********************************************************************************");
Manager.LogIf(LogLevel >= 1, "Input: " + currentUrl, "Rewrite");
// check if max number of internal transfers have been exceeded
if (InternalTransferCount(httpContext) > MaxInternalTransfers)
{
string message = "Exceeded the max number of internal transfers.";
Manager.LogIf(LogLevel >= 1, message, "Error");
throw new HttpException(500, message);
}
var temporyFlags = (IRuleFlagProcessor)null;
var skipNextChain = false;
var initialUrl = currentUrl;
if (!String.IsNullOrEmpty(VirtualBase) && VirtualBase != "/")
{
currentUrl = RemoveBase(VirtualBase, currentUrl);
}
// process rules according to their settings
for (int i = 0; i < _rules.Count; i++)
{
var ruleContext = new RuleContext(i, context, currentUrl, _rules[i]);
temporyFlags = _rules[i].Flags;
// continue if this rule shouldn't be processed because it doesn't allow internal transfer requests
if (RuleFlagsProcessor.HasNotForInternalSubRequests(temporyFlags) && IsInternalTransfer(httpContext))
{
continue;
}
bool containsChain = RuleFlagsProcessor.HasChain(_rules[i].Flags);
bool previousContainsChain = RuleFlagsProcessor.HasChain(_rules[Math.Max(0, i - 1)].Flags);
// if the previous rule doesn't contain a chain flag then set the initial URL
// this will be used to reset a chain if one of the chain rules fail
if (!previousContainsChain)
{
initialUrl = currentUrl;
}
// skip if the current rule or the last rule has a chain flag
// and if the skip next chain is set
if (skipNextChain && (previousContainsChain || containsChain))
{
continue;
}
else
{
skipNextChain = false;
}
if (_rules[i].TryExecute(ruleContext))
{
var flagResponse = temporyFlags.Apply(ruleContext);
currentUrl = ruleContext.SubstitutedUrl;
i = ruleContext.RuleIndex ?? -1;
bool breakLoop = false;
// apply the flags to the rules, and only do special processing
// for the flag responses listed in the switch statement below
switch (flagResponse)
{
case RuleFlagProcessorResponse.ExitRuleSet:
return(null);
case RuleFlagProcessorResponse.LastRule:
breakLoop = true;
break;
}
// break the loop because we have reached the last rule as indicated by a flag
if (breakLoop)
{
break;
}
}
else if (containsChain)
{
skipNextChain = true;
// reset the current URL back to the initial URL from the start of the chain
currentUrl = initialUrl;
}
else if (previousContainsChain)
{
// reset the current URL back to the initial URL from the start of the chain
currentUrl = initialUrl;
}
}
// if the scheme, host, and ports do not match on the request vs the rewrite a redirect needs to be performed instead of a rewrite
if (Uri.Compare(currentUrl, context.RequestedUrl, UriComponents.SchemeAndServer, UriFormat.SafeUnescaped, StringComparison.OrdinalIgnoreCase) != 0)
{
Manager.LogIf(LogLevel >= 1, "Output: 302 Redirect to " + currentUrl, "Rewrite");
Manager.Redirect(httpContext, "found", currentUrl);
}
if (!String.IsNullOrEmpty(VirtualBase) && VirtualBase != "/")
{
currentUrl = AddBase(VirtualBase, currentUrl);
}
Manager.LogIf(LogLevel >= 1, "Output: " + currentUrl, "Rewrite");
Manager.LogIf(LogLevel >= 1, "**********************************************************************************");
Manager.TryToAddXRewriteUrlHeader(httpContext);
Manager.TryToAddVanityHeader(httpContext);
}
// if the http request url matches for both the request and the rewrite no work was done so the url should be null
if (Uri.Compare(currentUrl, url, UriComponents.HttpRequestUrl, UriFormat.SafeUnescaped, StringComparison.OrdinalIgnoreCase) == 0)
{
currentUrl = null;
}
return(currentUrl);
}
