public static string CalculateResourceName(
string httpMethod,
string routeTemplate,
IDictionary <string, object> routeValues,
IDictionary <string, object>?defaults,
out string?areaName,
out string?controllerName,
out string?actionName,
bool addSlashPrefix,
bool expandRouteTemplates)
{
// We could calculate the actual maximum size required by looping through all the
// route values provided, comparing the parameter sizes to the parameter values
// (only action/controller/area unless expandRouteParameters = true,
// but doesn't seem worth it
var sb = StringBuilderCache.Acquire(StringBuilderCache.MaxBuilderSize);
sb.Append(httpMethod)
.Append(' ');
if (addSlashPrefix)
{
sb.Append('/');
}
sb.Append(routeTemplate.ToLowerInvariant());
areaName = null;
controllerName = null;
actionName = null;
foreach (var kvp in routeValues)
{
if (string.Equals(kvp.Key, "action", StringComparison.OrdinalIgnoreCase) && kvp.Value is string action)
{
actionName = action.ToLowerInvariant();
sb.Replace("{action}", actionName);
}
else if (string.Equals(kvp.Key, "controller", StringComparison.OrdinalIgnoreCase) && kvp.Value is string controller)
{
controllerName = controller.ToLowerInvariant();
sb.Replace("{controller}", controllerName);
}
else if (string.Equals(kvp.Key, "area", StringComparison.OrdinalIgnoreCase) && kvp.Value is string area)
{
areaName = area.ToLowerInvariant();
sb.Replace("{area}", areaName);
}
else if (expandRouteTemplates)
{
var valueAsString = kvp.Value as string ?? kvp.Value?.ToString() ?? string.Empty;
if (UriHelpers.IsIdentifierSegment(valueAsString, 0, valueAsString.Length))
{
// We're replacing the key with itself, so that we strip out all the additional parameters etc
// We should probably be doing that for the non-expanded approach too, but we historically haven't
ReplaceValue(sb, kvp.Key, kvp.Key, ReplaceType.ValueOnly);
}
else
{
ReplaceValue(sb, kvp.Key, valueAsString, ReplaceType.ValueAndBraces);
}
}
}
// Remove unused parameters from conventional route templates
if (defaults is not null)
{
foreach (var kvp in defaults)
{
if (routeValues.ContainsKey(kvp.Key))
{
continue;
}
ReplaceValue(sb, kvp.Key, null, replaceType: ReplaceType.ValueBracesAndLeadingSlash);
}
}
return(StringBuilderCache.GetStringAndRelease(sb));
}