feat: add pub(dart) validation according to spec (#51)

Author: topaztee

src/package-url.js

@@ -74,13 +74,22 @@ class PackageURL {
   _handlePyPi() {
     this.name = this.name.toLowerCase().replace(/_/g, '-');
   }
+  _handlePub() {
+    this.name = this.name.toLowerCase();
+    if (!/^[a-z0-9_]+$/i.test(this.name)) {
+      throw new Error('Invalid purl: contains an illegal character.');
+    }
+  }
 
   toString() {
     var purl = ['pkg:', encodeURIComponent(this.type), '/'];
 
     if (this.type === 'pypi') {
       this._handlePyPi();
     }
+    if (this.type === 'pub') {
+      this._handlePub();
+    }
 
     if (this.namespace) {
       purl.push(

test/data/test-suite-data.json

@@ -323,6 +323,30 @@
     "subpath": null,
     "is_invalid": true
   },
+  {
+    "description": "checks for invalid characters",
+    "purl": "pkg:pub/flutter_downloader@1.0.0",
+    "canonical_purl": "pkg:pub/flutter_downloader@1.0.0",
+    "type": "pub",
+    "namespace": null,
+    "name": "flutter_downloader",
+    "version": "1.0.0",
+    "qualifiers": null,
+    "subpath": null,
+    "is_invalid": false
+  },
+  {
+    "description": "checks for invalid characters",
+    "purl": "pkg:pub/flutter--downloader@1.0.0",
+    "canonical_purl": "pkg:pub/flutter--downloader@1.0.0",
+    "type": "pub",
+    "namespace": null,
+    "name": null,
+    "version": null,
+    "qualifiers": null,
+    "subpath": null,
+    "is_invalid": true
+  },
   {
     "description": "namespace can contain special characters",
     "purl": "pkg:npm/%40foo%40%3F%23/bar@1.0.0",