From 2af98a5353d5663217ef95908a4b5ea4c9db9531 Mon Sep 17 00:00:00 2001
From: Jelle Raaijmakers <jelle@ladybird.org>
Date: Tue, 26 Nov 2024 13:46:29 +0100
Subject: [PATCH] LibWeb: Partially implement `MediaSource.isTypeSupported()`

---
 .../MediaSourceExtensions/MediaSource.cpp     |  25 +++++
 .../MediaSourceExtensions/MediaSource.h       |   2 +
 .../MediaSourceExtensions/MediaSource.idl     |   2 +-
 .../mediasource-is-type-supported.txt         |  66 +++++++++++
 .../mediasource-is-type-supported.html        | 106 ++++++++++++++++++
 5 files changed, 200 insertions(+), 1 deletion(-)
 create mode 100644 Tests/LibWeb/Text/expected/wpt-import/media-source/mediasource-is-type-supported.txt
 create mode 100644 Tests/LibWeb/Text/input/wpt-import/media-source/mediasource-is-type-supported.html

diff --git a/Libraries/LibWeb/MediaSourceExtensions/MediaSource.cpp b/Libraries/LibWeb/MediaSourceExtensions/MediaSource.cpp
index f809a30b542cc..bd3db4274d3ed 100644
--- a/Libraries/LibWeb/MediaSourceExtensions/MediaSource.cpp
+++ b/Libraries/LibWeb/MediaSourceExtensions/MediaSource.cpp
@@ -8,6 +8,7 @@
 #include <LibWeb/Bindings/MediaSourcePrototype.h>
 #include <LibWeb/MediaSourceExtensions/EventNames.h>
 #include <LibWeb/MediaSourceExtensions/MediaSource.h>
+#include <LibWeb/MimeSniff/MimeType.h>
 
 namespace Web::MediaSourceExtensions {
 
@@ -67,4 +68,28 @@ GC::Ptr<WebIDL::CallbackType> MediaSource::onsourceclose()
     return event_handler_attribute(EventNames::sourceclose);
 }
 
+// https://w3c.github.io/media-source/#dom-mediasource-istypesupported
+WebIDL::ExceptionOr<bool> MediaSource::is_type_supported(JS::VM&, String const& type)
+{
+    // 1. If type is an empty string, then return false.
+    if (type == ""sv)
+        return false;
+
+    // 2. If type does not contain a valid MIME type string, then return false.
+    auto mime_type = MimeSniff::MimeType::parse(type);
+    if (!mime_type.has_value())
+        return false;
+
+    // FIXME: 3. If type contains a media type or media subtype that the MediaSource does not support, then
+    //    return false.
+
+    // FIXME: 4. If type contains a codec that the MediaSource does not support, then return false.
+
+    // FIXME: 5. If the MediaSource does not support the specified combination of media type, media
+    //    subtype, and codecs then return false.
+
+    // 6. Return true.
+    return true;
+}
+
 }
diff --git a/Libraries/LibWeb/MediaSourceExtensions/MediaSource.h b/Libraries/LibWeb/MediaSourceExtensions/MediaSource.h
index d00e94b932957..1b0501713679d 100644
--- a/Libraries/LibWeb/MediaSourceExtensions/MediaSource.h
+++ b/Libraries/LibWeb/MediaSourceExtensions/MediaSource.h
@@ -30,6 +30,8 @@ class MediaSource : public DOM::EventTarget {
     void set_onsourceclose(GC::Ptr<WebIDL::CallbackType>);
     GC::Ptr<WebIDL::CallbackType> onsourceclose();
 
+    static WebIDL::ExceptionOr<bool> is_type_supported(JS::VM&, String const&);
+
 protected:
     MediaSource(JS::Realm&);
 
diff --git a/Libraries/LibWeb/MediaSourceExtensions/MediaSource.idl b/Libraries/LibWeb/MediaSourceExtensions/MediaSource.idl
index 77d7fbd5336be..18e09318bb617 100644
--- a/Libraries/LibWeb/MediaSourceExtensions/MediaSource.idl
+++ b/Libraries/LibWeb/MediaSourceExtensions/MediaSource.idl
@@ -38,5 +38,5 @@ interface MediaSource : EventTarget {
     [FIXME] undefined endOfStream(optional EndOfStreamError error);
     [FIXME] undefined setLiveSeekableRange(double start, double end);
     [FIXME] undefined clearLiveSeekableRange();
-    [FIXME] static boolean isTypeSupported(DOMString type);
+    static boolean isTypeSupported(DOMString type);
 };
diff --git a/Tests/LibWeb/Text/expected/wpt-import/media-source/mediasource-is-type-supported.txt b/Tests/LibWeb/Text/expected/wpt-import/media-source/mediasource-is-type-supported.txt
new file mode 100644
index 0000000000000..8cee2130bd600
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/media-source/mediasource-is-type-supported.txt
@@ -0,0 +1,66 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 55 tests
+
+28 Pass
+27 Fail
+Details
+Result	Test Name	MessagePass	Test invalid MIME format "video"	
+Pass	Test invalid MIME format "video/"	
+Fail	Test invalid MIME format "video/webm"	
+Fail	Test invalid MIME format "video/webm;"	
+Fail	Test invalid MIME format "video/webm;codecs"	
+Fail	Test invalid MIME format "video/webm;codecs="	
+Fail	Test invalid MIME format "video/webm;codecs=""	
+Fail	Test invalid MIME format "video/webm;codecs="""	
+Fail	Test invalid MIME format "video/webm;codecs=",""	
+Fail	Test invalid MIME format "audio/webm;aaacodecsbbb=opus"	
+Pass	Test invalid MIME format "unsupported_mediatype"	
+Pass	Test invalid MIME format ""	
+Pass	Test invalid MIME format "null"	
+Pass	Test invalid MSE MIME media type "xxx"	
+Fail	Test invalid MSE MIME media type "text/html"	
+Fail	Test invalid MSE MIME media type "image/jpeg"	
+Fail	Test invalid mismatch between MIME type and codec ID "audio/webm;codecs="vp8""	
+Fail	Test invalid mismatch between MIME type and codec ID "audio/mp4;codecs="avc1.4d001e""	
+Fail	Test invalid mismatch between MIME type and codec ID "audio/mp4;codecs="vorbis""	
+Fail	Test invalid mismatch between MIME type and codec ID "audio/webm;codecs="mp4a.40.2""	
+Fail	Test invalid mismatch between MIME type and codec ID "video/mp4;codecs="vp8""	
+Fail	Test invalid mismatch between MIME type and codec ID "video/mp4;codecs="vorbis""	
+Fail	Test invalid mismatch between MIME type and codec ID "video/webm;codecs="mp4a.40.2""	
+Fail	Test invalid inclusion of codecs parameter for mpeg audio types "audio/mpeg;codecs="mp3""	
+Fail	Test invalid inclusion of codecs parameter for mpeg audio types "audio/mpeg;codecs="mp4a.69""	
+Fail	Test invalid inclusion of codecs parameter for mpeg audio types "audio/mpeg;codecs="mp4a.6B""	
+Fail	Test invalid inclusion of codecs parameter for mpeg audio types "audio/aac;codecs="aac""	
+Fail	Test invalid inclusion of codecs parameter for mpeg audio types "audio/aac;codecs="adts""	
+Fail	Test invalid inclusion of codecs parameter for mpeg audio types "audio/aac;codecs="mp4a.40""	
+Fail	Test invalid codec ID "audio/mp4;codecs="mp4a""	
+Fail	Test invalid codec ID "audio/mp4;codecs="mp4a.40""	
+Fail	Test invalid codec ID "audio/mp4;codecs="mp4a.40.""	
+Fail	Test invalid codec ID "audio/mp4;codecs="mp4a.67.3""	
+Pass	Test valid WebM type "video/webm;codecs="vp8""	
+Pass	Test valid WebM type "video/webm;codecs="vorbis""	
+Pass	Test valid WebM type "video/webm;codecs="vp8,vorbis""	
+Pass	Test valid WebM type "video/webm;codecs="vorbis, vp8""	
+Pass	Test valid WebM type "audio/webm;codecs="vorbis""	
+Pass	Test valid WebM type "AUDIO/WEBM;CODECS="vorbis""	
+Pass	Test valid WebM type "audio/webm;codecs=vorbis;test="6""	
+Pass	Test valid WebM type "audio/webm;codecs="opus""	
+Pass	Test valid WebM type "video/webm;codecs="opus""	
+Pass	Test valid MP4 type "video/mp4;codecs="avc1.4d001e""	
+Pass	Test valid MP4 type "video/mp4;codecs="avc1.42001e""	
+Pass	Test valid MP4 type "audio/mp4;codecs="mp4a.40.2""	
+Pass	Test valid MP4 type "audio/mp4;codecs="mp4a.40.5""	
+Pass	Test valid MP4 type "audio/mp4;codecs="mp4a.67""	
+Pass	Test valid MP4 type "video/mp4;codecs="mp4a.40.2""	
+Pass	Test valid MP4 type "video/mp4;codecs="avc1.4d001e,mp4a.40.2""	
+Pass	Test valid MP4 type "video/mp4;codecs="mp4a.40.2 , avc1.4d001e ""	
+Pass	Test valid MP4 type "video/mp4;codecs="avc1.4d001e,mp4a.40.5""	
+Pass	Test valid MP4 type "audio/mp4;codecs="Opus""	
+Pass	Test valid MP4 type "video/mp4;codecs="Opus""	
+Pass	Test valid MP4 type "audio/mp4;codecs="fLaC""	
+Pass	Test valid MP4 type "video/mp4;codecs="fLaC""	
diff --git a/Tests/LibWeb/Text/input/wpt-import/media-source/mediasource-is-type-supported.html b/Tests/LibWeb/Text/input/wpt-import/media-source/mediasource-is-type-supported.html
new file mode 100644
index 0000000000000..bfc5bc10971fd
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/media-source/mediasource-is-type-supported.html
@@ -0,0 +1,106 @@
+<!DOCTYPE html>
+<!-- Copyright © 2016 Chromium authors and World Wide Web Consortium, (Massachusetts Institute of Technology, ERCIM, Keio University, Beihang). -->
+<html>
+    <head>
+        <title>MediaSource.isTypeSupported() test cases.</title>
+        <script src="../resources/testharness.js"></script>
+        <script src="../resources/testharnessreport.js"></script>
+    </head>
+    <body>
+        <div id="log"></div>
+        <script>
+          // Generate a distinct test for each type in types
+          function test_type_support(types, expectation, description)
+          {
+              for (var i = 0; i < types.length; ++i) {
+                  test(function()
+                  {
+                      assert_equals(MediaSource.isTypeSupported(types[i]),
+                                    expectation, 'supported');
+                  },  description + ' "' + types[i] + '"');
+              }
+          };
+
+          test_type_support([
+              'video',
+              'video/',
+              'video/webm',
+              'video/webm;',
+              'video/webm;codecs',
+              'video/webm;codecs=',
+              'video/webm;codecs="',
+              'video/webm;codecs=""',
+              'video/webm;codecs=","',
+              'audio/webm;aaacodecsbbb=opus',
+              'unsupported_mediatype',
+              '',
+              null
+          ], false, 'Test invalid MIME format');
+
+          test_type_support([
+              'xxx',
+              'text/html',
+              'image/jpeg'
+          ], false, 'Test invalid MSE MIME media type');
+
+          test_type_support([
+              'audio/webm;codecs="vp8"',
+              'audio/mp4;codecs="avc1.4d001e"',
+              'audio/mp4;codecs="vorbis"',
+              'audio/webm;codecs="mp4a.40.2"',
+              'video/mp4;codecs="vp8"',
+              'video/mp4;codecs="vorbis"',
+              'video/webm;codecs="mp4a.40.2"',
+          ], false, 'Test invalid mismatch between MIME type and codec ID');
+
+          // Note that, though the user agent might support some subset of
+          // these for progressive non-MSE playback, the MSE mpeg audio
+          // bytestream format specification requires there to be no codecs
+          // parameter.
+          test_type_support([
+              'audio/mpeg;codecs="mp3"',
+              'audio/mpeg;codecs="mp4a.69"',
+              'audio/mpeg;codecs="mp4a.6B"',
+              'audio/aac;codecs="aac"',
+              'audio/aac;codecs="adts"',
+              'audio/aac;codecs="mp4a.40"',
+          ], false, 'Test invalid inclusion of codecs parameter for mpeg audio types');
+
+          test_type_support([
+              'audio/mp4;codecs="mp4a"',
+              'audio/mp4;codecs="mp4a.40"',
+              'audio/mp4;codecs="mp4a.40."',
+              'audio/mp4;codecs="mp4a.67.3"'
+          ], false, 'Test invalid codec ID');
+
+          test_type_support([
+              'video/webm;codecs="vp8"',
+              'video/webm;codecs="vorbis"',
+              'video/webm;codecs="vp8,vorbis"',
+              'video/webm;codecs="vorbis, vp8"',
+              'audio/webm;codecs="vorbis"',
+              'AUDIO/WEBM;CODECS="vorbis"',
+              'audio/webm;codecs=vorbis;test="6"',
+              'audio/webm;codecs="opus"',
+              'video/webm;codecs="opus"'
+          ], true, 'Test valid WebM type');
+
+          test_type_support([
+              'video/mp4;codecs="avc1.4d001e"', // H.264 Main Profile level 3.0
+              'video/mp4;codecs="avc1.42001e"', // H.264 Baseline Profile level 3.0
+              'audio/mp4;codecs="mp4a.40.2"',   // MPEG4 AAC-LC
+              'audio/mp4;codecs="mp4a.40.5"',   // MPEG4 HE-AAC
+              'audio/mp4;codecs="mp4a.67"',     // MPEG2 AAC-LC
+              'video/mp4;codecs="mp4a.40.2"',
+              'video/mp4;codecs="avc1.4d001e,mp4a.40.2"',
+              'video/mp4;codecs="mp4a.40.2 , avc1.4d001e "',
+              'video/mp4;codecs="avc1.4d001e,mp4a.40.5"',
+              'audio/mp4;codecs="Opus"',
+              'video/mp4;codecs="Opus"',
+              'audio/mp4;codecs="fLaC"',
+              'video/mp4;codecs="fLaC"'
+          ], true, 'Test valid MP4 type');
+
+        </script>
+    </body>
+</html>