Support overriding input format in JS API (#237)

Author: lexaknyazev

node/README.md

@@ -48,6 +48,7 @@ const asset = fs.readFileSync(fullpath);
 
 validator.validateBytes(new Uint8Array(asset), {
     uri: filename,
+    format: 'gltf', // skip auto-detection and parse the input as glTF JSON
     maxIssues: 10, // limit max number of output issues to 10
     ignoredIssues: ['UNSUPPORTED_EXTENSION'], // mute UNSUPPORTED_EXTENSION issue
     severityOverrides: { 'ACCESSOR_INDEX_TRIANGLE_DEGENERATE': 0 }, // treat degenerate triangles as errors

node/gltf_validator.dart

@@ -63,6 +63,8 @@ abstract class Exports {
 abstract class _JSValidationOptions {
   external Object get uri;
 
+  external Object get format;
+
   external ExternalResourceFunction get externalResourceFunction;
 
   external bool get writeTimestamp;
@@ -116,13 +118,22 @@ Future<Map<String, Object>> validateBytes(
   final _options = _checkOptionsObject(options);
   final context = _getContextFromOptions(_options);
 
-  GltfReaderResult readerResult;
-  try {
-    final reader = await GltfReader.detect(Stream.value(data), context);
-    readerResult = await reader.read();
-  } on GltfInvalidFormatException {
-    rethrow;
+  GltfReader reader;
+  switch ((_options?.format as String)?.toLowerCase()) {
+    case 'glb':
+      reader = GlbReader(Stream.value(data), context);
+      break;
+    case 'gltf':
+      reader = GltfJsonReader(Stream.value(data), context);
+      break;
+    default:
+      try {
+        reader = await GltfReader.detect(Stream.value(data), context);
+      } on GltfInvalidFormatException {
+        rethrow;
+      }
   }
+  final readerResult = await reader.read();
 
   return _validateResourcesAndGetReport(_options, context, readerResult);
 }
@@ -204,6 +215,10 @@ Context _getContextFromOptions(_JSValidationOptions options) {
   List<String> ignoredIssues;
 
   if (options != null) {
+    if (options.format != null && options.format is! String) {
+      throw ArgumentError('options.format: Value must be a string.');
+    }
+
     if (options.maxIssues != null &&
         (options.maxIssues is! int || options.maxIssues < 0)) {
       throw ArgumentError(

node/index.js

@@ -47,6 +47,7 @@ exports.validateString = (json, options) => validator.validateString(json, optio
 /**
  @typedef {Object} ValidationOptions
  @property {string} uri - Absolute or relative asset URI that will be copied to validation report.
+ @property {string} format - Set to `glb` or `gltf` to skip auto-detection of the asset format based on the first byte; any other value will be ignored. This option has no effect on `validateString`.
  @property {ExternalResourceFunction} externalResourceFunction - Function for loading external resources. If omitted, external resources are not validated.
  @property {boolean} writeTimestamp - Set to `false` to omit timestamp from the validation report. Default is `true`.
  @property {number} maxIssues - Max number of reported issues. Use `0` for unlimited output.

node/module.mjs

@@ -47,6 +47,7 @@ export const validateString = (json, options) => v.default.validateString(json,
 /**
  @typedef {Object} ValidationOptions
  @property {string} uri - Absolute or relative asset URI that will be copied to validation report.
+ @property {string} format - Set to `glb` or `gltf` to skip auto-detection of the asset format based on the first byte; any other value will be ignored. This option has no effect on `validateString`.
  @property {ExternalResourceFunction} externalResourceFunction - Function for loading external resources. If omitted, external resources are not validated.
  @property {boolean} writeTimestamp - Set to `false` to omit timestamp from the validation report.
  @property {number} maxIssues - Max number of reported issues. Use `0` for unlimited output.