/// <summary>
/// Rewrite the hostname if it matches any of the hostname rewrite rules.
/// The requested path and querystring is kept intact, only the hostname is rewritten.
/// </summary>
/// <param name="args">HttpRequest pipeline arguments.</param>
private void RewriteHostName(HttpRequestArgs args)
{
if (!hostNameRewriteRulesCache.Any())
{
return;
}
// Extract the hostname from the request URL.
Uri requestUrl = args.Context.Request.Url;
string hostName = requestUrl.Host;
// Check if there is a hostname rewrite rule that matches the requested hostname.
HostNameRewriteRule rule = hostNameRewriteRulesCache
.FirstOrDefault(x => x.SourceHostName.Equals(hostName, StringComparison.InvariantCultureIgnoreCase));
if (rule == null)
{
// No matching rewrite rule was found.
return;
}
// Set the target URL with the new hostname and the original path and query.
string scheme = requestUrl.Scheme;
string path = requestUrl.AbsolutePath;
string query = requestUrl.Query;
string targetUrl = string.Concat(scheme, "://", rule.TargetHostName, path, query);
if (Settings.LogRewrites)
{
// Write an entry to the Sitecore log informing about the rewrite.
Logging.LogInfo(string.Format("Hostname rewrite rule '{0}' caused the requested URL '{1}' to be rewritten to '{2}'", rule.ItemId, requestUrl.AbsoluteUri, targetUrl), this);
}
// Return a permanent redirect to the target URL.
this.Redirect(targetUrl, args.Context);
}
/// <summary>
/// Add a rewrite rule from Sitecore to the cache.
/// </summary>
/// <param name="rewriteRuleItem"></param>
private void AddRewriteRule(Item rewriteRuleItem)
{
// Convert the rewrite rule item to a model object and add to the cache.
if (rewriteRuleItem.TemplateID.Equals(ItemIds.Templates.UrlRewriteRule))
{
// Add a URL rewrite rule.
var rule = new UrlRewriteRule(rewriteRuleItem);
if (rule.Validate())
{
urlRewriteRulesCache.Add(rule);
}
}
else if (rewriteRuleItem.TemplateID.Equals(ItemIds.Templates.HostNameRewriteRule))
{
// Add a hostname rewrite rule.
var rule = new HostNameRewriteRule(rewriteRuleItem);
if (rule.Validate())
{
hostNameRewriteRulesCache.Add(rule);
}
}
}
