internal static async Task ManageRequest(HttpContext context, FileContentReference fileContent, string contentType = "application/javascript")
{
await ManageRequestHeaders(context, contentType, fileContent.ETag, fileContent.ContentLength, async() =>
{
await context.Response.WriteAsync(fileContent.Value);
});
}
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);
}
internal static async Task ManageRequest(HttpContext context, FileContentReference fileContent, string contentType = "application/javascript")
{
context.Response.ContentType = contentType;
context.Response.Headers.Append(HeaderNames.CacheControl, "no-cache");
context.Response.Headers.Append(HeaderNames.LastModified, fileContent.LastModified.ToString("r"));
context.Response.Headers.Append(HeaderNames.ETag, fileContent.ETag);
//In this case we should return the entire response
if (RequestHasTheNoCacheHeaderSet(context.Request) ||
RequestHasNoCachingFeatureSet(context.Request) ||
RequestHasCacheFeaturesExpired(context.Request, fileContent))
{
context.Response.Headers.Append(HeaderNames.ContentLength, fileContent.ContentLength);
context.Response.StatusCode = (int)HttpStatusCode.OK;
await context.Response.WriteAsync(fileContent.Value);
}
else
{
context.Response.StatusCode = (int)HttpStatusCode.NotModified;
}
}
private static bool RequestHasCacheFeaturesExpired(HttpRequest request, FileContentReference fileContent)
{
string IfModifiedSince = null;
string IfNoneMatch = null;
DateTime IfModifiedSinceDate = default;
//Must be in first check, as the library may update in the future but we can't be totally aware of the modification
//date as it's related to the Microsoft library, not this one.
if (request.Headers.ContainsKey(HeaderNames.IfNoneMatch))
{
IfNoneMatch = request.Headers[HeaderNames.IfNoneMatch].ToString();
if (fileContent.ETag == IfNoneMatch)
{
return(false);
}
else
{
return(true);
}
}
else if (request.Headers.ContainsKey(HeaderNames.IfModifiedSince))
{
IfModifiedSince = request.Headers[HeaderNames.IfModifiedSince].ToString();
if (DateTime.TryParseExact(IfModifiedSince, "r", CultureInfo.InvariantCulture, DateTimeStyles.None, out IfModifiedSinceDate))
{
if (IfModifiedSinceDate == fileContent.LastModified)
{
return(false);
}
else
{
return(true);
}
}
}
return(true);
}
private static FileContentReference GetBlazorPolyfillFile(bool isIE11, bool isMinified)
{
if (!isIE11)
{
if (_fakeie11Polyfill == null)
{
var assembly = GetBlazorPolyfillAssembly();
var resources = assembly.GetManifestResourceNames();
var resourceName = resources.Single(str => str.EndsWith("fake.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 = CryptographyHelper.CreateSHA256(js);
//Computing Build time for the Last-Modified Http Header
DateTime buildTime = GetBlazorPolyfillServerBuildDate();
_fakeie11Polyfill = new FileContentReference()
{
Value = js,
ETag = Etag,
LastModified = buildTime,
ContentLength = System.Text.UTF8Encoding.UTF8.GetByteCount(js).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();
//Should inject es5 module override before launch
js = GetOptions().GetJavascriptToInject() + js;
//Computing ETag. Should be computed last !
string Etag = CryptographyHelper.CreateSHA256(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();
//Should inject es5 module override before launch
js = GetOptions().GetJavascriptToInject() + js;
//Computing ETag. Should be computed last !
string Etag = CryptographyHelper.CreateSHA256(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);
}
}
}
private static FileContentReference GetPatchedBlazorServerFile()
{
if (_patchedBlazorServerFile == null)
{
BlazorPolyfillOptions option = GetOptions();
if (option.UsePackagedBlazorServerLibrary)
{
//Get packaged blazor.server.js
var assembly = GetBlazorPolyfillAssembly();
var resources = assembly.GetManifestResourceNames();
var resourceName = resources.Single(str => str.EndsWith("blazor.server.packaged.js"));
using (Stream stream = assembly.GetManifestResourceStream(resourceName))
{
using (StreamReader reader = new StreamReader(stream))
{
string js = reader.ReadToEnd();
string Etag = CryptographyHelper.CreateSHA256(js);
//We should rely on ETag and not on LastModifed informations
DateTime buildTime = GetAssemblyCreationDate(assembly);
_patchedBlazorServerFile = new FileContentReference()
{
Value = js,
ETag = Etag,
LastModified = buildTime,
ContentLength = System.Text.UTF8Encoding.UTF8.GetByteCount(js).ToString(CultureInfo.InvariantCulture)
};
}
}
}
else
{
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();
#region Patch Regex
//Patch Descriptor Regex as it make Babel crash during transform
js = js.Replace("/\\W*Blazor:[^{]*(?<descriptor>.*)$/;", @"/[\0-\/:-@\[-\^`\{-\uFFFF]*Blazor:(?:(?!\{)[\s\S])*(.*)$/;");
js = js.Replace("/^\\s*Blazor-Component-State:(?<state>[a-zA-Z0-9\\+\\/=]+)$/", @"/^[\t-\r \xA0\u1680\u2000-\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF]*Blazor\x2DComponent\x2DState:([\+\/-9=A-Za-z]+)$/");
js = js.Replace("/^\\s*Blazor:[^{]*(?<descriptor>.*)$/", @"/^[\t-\r \xA0\u1680\u2000-\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF]*Blazor:(?:(?!\{)[\s\S])*(.*)$/");
#endregion Patch Regex
//Transpile code to ES5 for IE11 before manual patching
js = BabelHelper.Transform(js, "blazor.server.js");
#region Regex named groups fix
//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-Z0-9]+)(.groups[ ]*&&[ ]*[_a-zA-Z0-9]+.groups.descriptor)", "$1[1]");
//We still need to fix 'state' regex evaluation code, as it was expecting a named capture group.
js = Regex.Replace(js, "([_a-zA-Z0-9]+)(.groups[ ]*&&[ ]*[_a-zA-Z0-9]+.groups.state)", "$1[1]");
//Here we fix invalids interopRequireWildcard(require(''.concat(n))) to _interopRequireWildcard(''.concat(n)) (works for '' or "")
//Warning: " is written "" here but must be read as " from the regex logic: We are in a verbatim string
js = Regex.Replace(js, @"(require\((['""]['""].concat\([a-zA-Z]+\))\))", "$2");
#endregion Regex named groups fix
//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 = CryptographyHelper.CreateSHA256(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);
}
}
}
