public CdnResource(string _name, string _tagname, string outDir)
{
// create an element on the fly. Assume _name is a local minified file. NOT CDN.
// <IncludeRef name="/js/grid_common.min.js" tagname="script" /> // use minified name to indicate it has one.
ValidState.ThrowIfWhiteSpace(_name, "CdnResource name");
name = _name;
fallback_src = name;
if (_tagname == null)
{
// derive from the file extension.
if (_name.EndsWith(Minifier.kExtJs))
{
TagName = CdnTagName.script;
}
else if (_name.EndsWith(Minifier.kExtCss))
{
TagName = CdnTagName.link;
}
else
{
TagName = CdnTagName.a;
}
}
else
{
TagName = EnumUtil.ParseEnum <CdnTagName>(_tagname);
}
// Does it have a minified file? assume _name is the minified version.
string path1 = GetPhysPathFromWeb(outDir, name);
string name2 = Minifier.GetNonMinName(name);
string path2 = GetPhysPathFromWeb(outDir, name2);
bool exists1 = File.Exists(path1);
bool exists2 = File.Exists(path2);
if (exists1)
{
minonly = !exists2; // min exists. but does non-min ?
}
else if (exists2)
{
name = name2; // only non-min version exists.
path1 = path2;
minonly = true;
}
else
{
// neither exists. this is bad.
TagName = CdnTagName.ERROR;
minonly = false;
return;
}
// cache breaking version For local files. Equiv to "asp-append-version" (would use SHA256)
var hasher = new HashUtil(HashUtil.GetMD5()); // GetSHA256()
byte[] hashCode2 = hasher.GetHashFile(path1);
Debug.Assert(hashCode2 != null);
version = Convert.ToBase64String(hashCode2);
}
