private static FileContentReference GetPatchedBlazorServerFile()
{
if (_patchedBlazorServerFile == null)
{
var assembly = GetAspNetCoreComponentsServerAssembly();
var resources = assembly.GetManifestResourceNames();
var resourceName = resources.Single(str => str.EndsWith("blazor.server.js"));
using (Stream stream = assembly.GetManifestResourceStream(resourceName))
using (StreamReader reader = new StreamReader(stream))
{
string js = reader.ReadToEnd();
//Patch Descriptor Regex as it make Babel crash during transform
js = js.Replace("/\\W*Blazor:[^{]*(?<descriptor>.*)$/;", @"/[\0-\/:-@\[-\^`\{-\uFFFF]*Blazor:(?:(?!\{)[\s\S])*(.*)$/;");
//Transpile code to ES5 for IE11 before manual patching
js = Transform(js, "blazor.server.js", "{\"plugins\":[\"proposal-class-properties\",\"proposal-object-rest-spread\"],\"presets\":[[\"env\",{\"targets\":{\"browsers\":[\"ie 11\"]}}], \"es2015\",\"es2016\",\"es2017\",\"stage-3\"], \"sourceType\": \"script\"}");
//At this point, Babel has unminified the code, and fixed IE11 issues, like 'import' method calls.
//We still need to fix 'descriptor' regex evaluation code, as it was expecting a named capture group.
js = Regex.Replace(js, "([a-zA-Z]+)(.groups[ ]*&&[ ]*[a-zA-Z]+.groups.descriptor)", "$1[1]");
//Minify with AjaxMin (we don't want an additional external tool with NPM or else for managing this
//kind of thing here...
js = Uglify.Js(js).Code;
//Computing ETag. Should be computed last !
string Etag = EtagGenerator.GenerateEtagFromString(js);
//Computing Build time for the Last-Modified Http Header
//We should rely on the creation date of the Microsoft API
//not the Blazor.Polyfill.Server one as the Microsoft.AspNetCore.Components.Server
//assembly may be updated in time. We will rely on the current creation/modification date on disk
DateTime buildTime = GetAssemblyCreationDate(assembly);
_patchedBlazorServerFile = new FileContentReference()
{
Value = js,
ETag = Etag,
LastModified = buildTime,
ContentLength = System.Text.UTF8Encoding.UTF8.GetByteCount(js).ToString(CultureInfo.InvariantCulture)
};
}
}
return(_patchedBlazorServerFile);
}
private static FileContentReference GetIE11BlazorPolyfill(bool isIE11, bool isMinified)
{
if (!isIE11)
{
if (_fakeie11Polyfill == null)
{
string fakeContent = "var _fakeBlazorPolyfill = { };";
//Computing ETag. Should be computed last !
string Etag = EtagGenerator.GenerateEtagFromString(fakeContent);
//Computing Build time for the Last-Modified Http Header
DateTime buildTime = GetBlazorPolyfillServerBuildDate();
_fakeie11Polyfill = new FileContentReference()
{
Value = fakeContent,
ETag = Etag,
LastModified = buildTime,
ContentLength = System.Text.UTF8Encoding.UTF8.GetByteCount(fakeContent).ToString(CultureInfo.InvariantCulture)
};
}
return(_fakeie11Polyfill);
}
else
{
if (isMinified)
{
if (_ie11PolyfillMin == null)
{
var assembly = GetBlazorPolyfillAssembly();
var resources = assembly.GetManifestResourceNames();
var resourceName = resources.Single(str => str.EndsWith("blazor.polyfill.min.js"));
using (Stream stream = assembly.GetManifestResourceStream(resourceName))
using (StreamReader reader = new StreamReader(stream))
{
string js = reader.ReadToEnd();
//Computing ETag. Should be computed last !
string Etag = EtagGenerator.GenerateEtagFromString(js);
//Computing Build time for the Last-Modified Http Header
DateTime buildTime = GetBlazorPolyfillServerBuildDate();
_ie11PolyfillMin = new FileContentReference()
{
Value = js,
ETag = Etag,
LastModified = buildTime,
ContentLength = System.Text.UTF8Encoding.UTF8.GetByteCount(js).ToString(CultureInfo.InvariantCulture)
};
}
}
return(_ie11PolyfillMin);
}
else
{
if (_ie11Polyfill == null)
{
var assembly = GetBlazorPolyfillAssembly();
var resources = assembly.GetManifestResourceNames();
var resourceName = resources.Single(str => str.EndsWith("blazor.polyfill.js"));
using (Stream stream = assembly.GetManifestResourceStream(resourceName))
using (StreamReader reader = new StreamReader(stream))
{
string js = reader.ReadToEnd();
//Computing ETag. Should be computed last !
string Etag = EtagGenerator.GenerateEtagFromString(js);
//Computing Build time for the Last-Modified Http Header
DateTime buildTime = GetBlazorPolyfillServerBuildDate();
_ie11Polyfill = new FileContentReference()
{
Value = js,
ETag = Etag,
LastModified = buildTime,
ContentLength = System.Text.UTF8Encoding.UTF8.GetByteCount(js).ToString(CultureInfo.InvariantCulture)
};
}
}
return(_ie11Polyfill);
}
}
}
