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FlorianRapplFlorianRappl
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Merge pull request #93 from tomvanenckevort/module-importmap-support
Added support for JS modules and importmaps
2 parents 0e8d85e + 8aba70b commit 4ecbd42

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+566
-13
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10 files changed

+566
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lines changed

‎src/AngleSharp.Js.Tests/AngleSharp.Js.Tests.csproj‎

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@@ -18,6 +18,7 @@
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="AngleSharp.Io" Version="1.0.0" />
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<PackageReference Include="GitHubActionsTestLogger" Version="2.3.3">
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<PrivateAssets>all</PrivateAssets>
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

‎src/AngleSharp.Js.Tests/Constants.cs‎

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‎src/AngleSharp.Js.Tests/EcmaTests.cs‎

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namespace AngleSharp.Js.Tests
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{
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using AngleSharp.Io;
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using AngleSharp.Js.Tests.Mocks;
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using NUnit.Framework;
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using System;
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using System.Collections.Generic;
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using System.Threading.Tasks;
69

710
[TestFixture]
@@ -17,5 +20,104 @@ public async Task BootstrapVersionFive()
1720
.ConfigureAwait(false);
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Assert.AreNotEqual("", result);
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}
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[Test]
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public async Task ModuleScriptShouldRun()
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{
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var config =
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Configuration.Default
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.WithJs()
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.With(new MockHttpClientRequester(new Dictionary<string, string>()
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{
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{ "/example-module.js", "import { $ } from '/jquery_4_0_0_esm.js'; $('#test').remove();" },
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{ "/jquery_4_0_0_esm.js", Constants.Jquery4_0_0_ESM }
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}))
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.WithDefaultLoader(new LoaderOptions() { IsResourceLoadingEnabled = true });
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var context = BrowsingContext.New(config);
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var html = "<!doctype html><div id=test>Test</div><script type=module src=/example-module.js></script>";
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var document = await context.OpenAsync(r => r.Content(html));
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Assert.IsNull(document.GetElementById("test"));
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}
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[Test]
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public async Task InlineModuleScriptShouldRun()
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{
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var config =
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Configuration.Default
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.WithJs()
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.With(new MockHttpClientRequester(new Dictionary<string, string>()
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{
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{ "/jquery_4_0_0_esm.js", Constants.Jquery4_0_0_ESM }
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}))
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.WithDefaultLoader(new LoaderOptions() { IsResourceLoadingEnabled = true });
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var context = BrowsingContext.New(config);
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var html = "<!doctype html><div id=test>Test</div><script type=module>import { $ } from '/jquery_4_0_0_esm.js'; $('#test').remove();</script>";
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var document = await context.OpenAsync(r => r.Content(html));
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Assert.IsNull(document.GetElementById("test"));
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}
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[Test]
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public async Task ModuleScriptWithImportMapShouldRun()
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{
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var config =
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Configuration.Default
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.WithJs()
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.With(new MockHttpClientRequester(new Dictionary<string, string>()
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{
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{ "/jquery_4_0_0_esm.js", Constants.Jquery4_0_0_ESM }
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}))
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.WithDefaultLoader(new LoaderOptions() { IsResourceLoadingEnabled = true });
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var context = BrowsingContext.New(config);
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var html = "<!doctype html><div id=test>Test</div><script type=importmap>{ \"imports\": { \"jquery\": \"/jquery_4_0_0_esm.js\" } }</script><script type=module>import { $ } from 'jquery'; $('#test').remove();</script>";
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var document = await context.OpenAsync(r => r.Content(html));
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Assert.IsNull(document.GetElementById("test"));
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}
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[Test]
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public async Task ModuleScriptWithScopedImportMapShouldRunCorrectScript()
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{
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var config =
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Configuration.Default
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.WithJs()
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.With(new MockHttpClientRequester(new Dictionary<string, string>()
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{
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{ "/example-module-1.js", "export function test() { document.getElementById('test1').remove(); }" },
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{ "/example-module-2.js", "export function test() { document.getElementById('test2').remove(); }" },
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{ "/test.js", "import { test } from 'example-module'; test();" },
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{ "/test/test.js", "import { test } from 'example-module'; test();" }
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}))
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.WithDefaultLoader(new LoaderOptions() { IsResourceLoadingEnabled = true });
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var context = BrowsingContext.New(config);
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var html1 = "<!doctype html><div id=test1>Test</div><div id=test2>Test</div><script type=importmap>{ \"imports\": { \"example-module\": \"/example-module-1.js\" }, \"scopes\": { \"/test/\": { \"example-module\": \"/example-module-2.js\" } } }</script><script type=module src=/test.js></script>";
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var document1 = await context.OpenAsync(r => r.Content(html1));
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Assert.IsNull(document1.GetElementById("test1"));
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Assert.IsNotNull(document1.GetElementById("test2"));
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99+
var html2 = "<!doctype html><div id=test1>Test</div><div id=test2>Test</div><script type=importmap>{ \"imports\": { \"example-module\": \"/example-module-1.js\" }, \"scopes\": { \"/test/\": { \"example-module\": \"/example-module-2.js\" } } }</script><script type=module src=/test/test.js></script>";
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var document2 = await context.OpenAsync(r => r.Content(html2));
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Assert.IsNull(document2.GetElementById("test2"));
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Assert.IsNotNull(document2.GetElementById("test1"));
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}
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[Test]
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public async Task ModuleScriptWithAbsoluteUrlImportMapShouldRun()
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{
108+
var config =
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Configuration.Default
110+
.WithJs()
111+
.With(new MockHttpClientRequester(new Dictionary<string, string>()
112+
{
113+
{ "/jquery_4_0_0_esm.js", Constants.Jquery4_0_0_ESM }
114+
}))
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.WithDefaultLoader(new LoaderOptions() { IsResourceLoadingEnabled = true });
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117+
var context = BrowsingContext.New(config);
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var html = "<!doctype html><div id=test>Test</div><script type=importmap>{ \"imports\": { \"https://example.com/jquery.js\": \"/jquery_4_0_0_esm.js\" } }</script><script type=module>import { $ } from 'https://example.com/jquery.js'; $('#test').remove();</script>";
119+
var document = await context.OpenAsync(r => r.Content(html));
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Assert.IsNull(document.GetElementById("test"));
121+
}
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}
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}

‎src/AngleSharp.Js.Tests/Mocks/MockHttpClientRequester.cs‎

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namespace AngleSharp.Js.Tests.Mocks
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{
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using AngleSharp.Io;
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using AngleSharp.Io.Network;
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using System.Collections.Generic;
6+
using System.IO;
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using System.Net;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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12+
/// <summary>
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/// Mock HttpClientRequester which returns content for a specific request from a local dictionary.
14+
/// </summary>
15+
internal class MockHttpClientRequester : HttpClientRequester
16+
{
17+
private readonly Dictionary<string, string> _mockResponses;
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public MockHttpClientRequester(Dictionary<string, string> mockResponses) : base()
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{
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_mockResponses = mockResponses;
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}
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protected override async Task<IResponse> PerformRequestAsync(Request request, CancellationToken cancel)
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{
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var response = new DefaultResponse();
27+
28+
if (_mockResponses.TryGetValue(request.Address.PathName, out var responseContent))
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{
30+
response.StatusCode = HttpStatusCode.OK;
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response.Content = new MemoryStream(Encoding.UTF8.GetBytes(responseContent));
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}
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else
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{
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response.StatusCode = HttpStatusCode.NotFound;
36+
response.Content = new MemoryStream(Encoding.UTF8.GetBytes(string.Empty));
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}
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39+
return response;
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}
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}
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}

‎src/AngleSharp.Js/EngineInstance.cs‎

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namespace AngleSharp.Js
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{
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using AngleSharp.Dom;
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using AngleSharp.Io;
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using AngleSharp.Text;
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using Jint;
57
using Jint.Native;
68
using Jint.Native.Object;
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private readonly ReferenceCache _references;
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private readonly IEnumerable<Assembly> _libs;
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private readonly DomNodeInstance _window;
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private readonly JsImportMap _importMap;
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2124
#endregion
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2326
#region ctor
2427

2528
public EngineInstance(IWindow window, IDictionary<String, Object> assignments, IEnumerable<Assembly> libs)
2629
{
27-
_engine = new Engine();
30+
_importMap = new JsImportMap();
31+
32+
_engine = new Engine((options) =>
33+
{
34+
options.EnableModules(new JsModuleLoader(this, window.Document, false));
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});
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_prototypes = new PrototypeCache(_engine);
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_references = new ReferenceCache();
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_libs = libs;
@@ -65,6 +73,8 @@ public EngineInstance(IWindow window, IDictionary<String, Object> assignments, I
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6674
public Engine Jint => _engine;
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76+
public JsImportMap ImportMap => _importMap;
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6878
#endregion
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7080
#region Methods
@@ -73,14 +83,98 @@ public EngineInstance(IWindow window, IDictionary<String, Object> assignments, I
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7484
public ObjectInstance GetDomPrototype(Type type) => _prototypes.GetOrCreate(type, CreatePrototype);
7585

76-
public JsValue RunScript(String source, JsValue context)
86+
public JsValue RunScript(String source, String type, String sourceUrl, JsValue context)
7787
{
88+
if (string.IsNullOrEmpty(type))
89+
{
90+
type = MimeTypeNames.DefaultJavaScript;
91+
}
92+
7893
lock (_engine)
7994
{
80-
return _engine.Evaluate(source);
95+
if (MimeTypeNames.IsJavaScript(type))
96+
{
97+
return _engine.Evaluate(source);
98+
}
99+
else if (type.Isi("importmap"))
100+
{
101+
return LoadImportMap(source);
102+
}
103+
else if (type.Isi("module"))
104+
{
105+
// use a unique specifier to import the module into Jint
106+
var specifier = sourceUrl ?? Guid.NewGuid().ToString();
107+
108+
return ImportModule(specifier, source);
109+
}
110+
else
111+
{
112+
return JsValue.Undefined;
113+
}
81114
}
82115
}
83116

117+
private JsValue LoadImportMap(String source)
118+
{
119+
var importMap = _engine.Evaluate($"JSON.parse('{source}')").AsObject();
120+
121+
if (importMap.TryGetValue("scopes", out var scopes))
122+
{
123+
var scopesObj = scopes.AsObject();
124+
125+
foreach (var scopeProperty in scopesObj.GetOwnProperties())
126+
{
127+
var scopePath = scopeProperty.Key.AsString();
128+
129+
if (_importMap.Scopes.ContainsKey(scopePath))
130+
{
131+
continue;
132+
}
133+
134+
var scopeValue = new Dictionary<string, Uri>();
135+
136+
var scopeImports = scopesObj[scopePath].AsObject();
137+
138+
foreach (var scopeImportProperty in scopeImports.GetOwnProperties())
139+
{
140+
var scopeImportSpecifier = scopeImportProperty.Key.AsString();
141+
142+
if (!scopeValue.ContainsKey(scopeImportSpecifier))
143+
{
144+
scopeValue.Add(scopeImportSpecifier, new Uri(scopeImports[scopeImportSpecifier].AsString(), UriKind.RelativeOrAbsolute));
145+
}
146+
}
147+
148+
_importMap.Scopes.Add(scopePath, scopeValue);
149+
}
150+
}
151+
152+
if (importMap.TryGetValue("imports", out var imports))
153+
{
154+
var importsObj = imports.AsObject();
155+
156+
foreach (var importProperty in importsObj.GetOwnProperties())
157+
{
158+
var importSpecifier = importProperty.Key.AsString();
159+
160+
if (!_importMap.Imports.ContainsKey(importSpecifier))
161+
{
162+
_importMap.Imports.Add(importSpecifier, new Uri(importsObj[importSpecifier].AsString(), UriKind.RelativeOrAbsolute));
163+
}
164+
}
165+
}
166+
167+
return JsValue.Undefined;
168+
}
169+
170+
private JsValue ImportModule(String specifier, String source)
171+
{
172+
_engine.Modules.Add(specifier, source);
173+
_engine.Modules.Import(specifier);
174+
175+
return JsValue.Undefined;
176+
}
177+
84178
#endregion
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86180
#region Helpers

‎src/AngleSharp.Js/Extensions/EngineExtensions.cs‎

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198198
apply.Invoke(engine, obj);
199199
}
200200

201-
public static JsValue RunScript(this EngineInstance engine, String source) =>
202-
engine.RunScript(source, engine.Window);
201+
public static JsValue RunScript(this EngineInstance engine, String source, String type, String sourceUrl) =>
202+
engine.RunScript(source, type, sourceUrl, engine.Window);
203203

204-
public static JsValue RunScript(this EngineInstance engine, String source, INode context) =>
205-
engine.RunScript(source, context.ToJsValue(engine));
204+
public static JsValue RunScript(this EngineInstance engine, String source, String type, String sourceUrl, INode context) =>
205+
engine.RunScript(source, type, sourceUrl, context.ToJsValue(engine));
206206

207207
public static JsValue Call(this EngineInstance instance, MethodInfo method, JsValue thisObject, JsValue[] arguments)
208208
{

‎src/AngleSharp.Js/JsApiExtensions.cs‎

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11
namespace AngleSharp.Js
22
{
33
using AngleSharp.Dom;
4+
using AngleSharp.Io;
45
using AngleSharp.Scripting;
56
using System;
67

@@ -14,14 +15,16 @@ public static class JsApiExtensions
1415
/// </summary>
1516
/// <param name="document">The document as context.</param>
1617
/// <param name="scriptCode">The script to run.</param>
18+
/// <param name="scriptType">The type of the script to run (defaults to "text/javascript").</param>
19+
/// <param name="sourceUrl">The URL of the script.</param>
1720
/// <returns>The result of running the script, if any.</returns>
18-
public static Object ExecuteScript(this IDocument document, String scriptCode)
21+
public static Object ExecuteScript(this IDocument document, String scriptCode, String scriptType = null, String sourceUrl = null)
1922
{
2023
if (document == null)
2124
throw new ArgumentNullException(nameof(document));
2225

2326
var service = document?.Context.GetService<JsScriptingService>();
24-
return service?.EvaluateScript(document, scriptCode);
27+
return service?.EvaluateScript(document, scriptCode, scriptType ?? MimeTypeNames.DefaultJavaScript, sourceUrl);
2528
}
2629
}
2730
}

‎src/AngleSharp.Js/JsImportMap.cs‎

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1+
namespace AngleSharp.Js
2+
{
3+
using System;
4+
using System.Collections.Generic;
5+
6+
/// <summary>
7+
/// https://html.spec.whatwg.org/multipage/webappapis.html#import-map
8+
/// </summary>
9+
sealed class JsImportMap
10+
{
11+
public JsImportMap()
12+
{
13+
Imports = new Dictionary<string, Uri>();
14+
Scopes = new Dictionary<string, Dictionary<string, Uri>>();
15+
}
16+
17+
/// <summary>
18+
/// Provides the mappings between module specifier text that might appear in an import statement or import() operator,
19+
/// and the text that will replace it when the specifier is resolved.
20+
/// </summary>
21+
public Dictionary<string, Uri> Imports { get; set; }
22+
23+
/// <summary>
24+
/// Mappings that are only used if the script importing the module contains a particular URL path.
25+
/// If the URL of the loading script matches the supplied path, the mapping associated with the scope will be used.
26+
/// </summary>
27+
public Dictionary<string, Dictionary<string, Uri>> Scopes { get; set; }
28+
}
29+
}

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