fix(javascript): strip peer-dep suffix from deno.lock npm keys (#5055)

deno.lock npm keys append resolved peer dependencies after the version,
separated by "_" (e.g. "typedoc@0.28.19_typescript@6.0.3" or the scoped
"@scope/name@1.2.3_@scope+peer@4.5.6"). parseDenoNpmNameVersion split on the
last "@", capturing a peer's "@" and producing a garbage package name plus
the peer's version (and a corrupt PURL that breaks vulnerability matching).

Strip the peer suffix (the first "_" after the version "@") before splitting
name@version; a semver version never contains "_".

Signed-off-by: Synvoya <16019863+Synvoya@users.noreply.github.com>
Co-authored-by: Synvoya <16019863+Synvoya@users.noreply.github.com>

syft/pkg/cataloger/javascript/parse_deno_lock.go

@@ -96,19 +96,35 @@ func parseDenoJsrNameVersion(nameVersion string) (name, version string) {
 }
 
 func parseDenoNpmNameVersion(nameVersion string) (name, version string) {
+	// deno.lock npm keys append resolved peer dependencies after the version,
+	// separated by "_", e.g. "typedoc@0.28.19_typescript@6.0.3" or the scoped
+	// "@scope/name@1.2.3_@scope+peer@4.5.6". The peer suffix must be stripped
+	// before splitting name@version, otherwise LastIndex("@") splits on a peer's
+	// "@" and yields a garbage name and the peer's version.
+	//
+	// A semver version never contains "_", and it begins immediately after the
+	// package name's version "@", so the first "_" following that "@" starts the
+	// peer list.
+	var versionAt int
 	if strings.HasPrefix(nameVersion, "@") {
-		rest := nameVersion[1:]
-		idx := strings.LastIndex(rest, "@")
+		// scoped "@scope/name@version": the version "@" is the second "@"
+		idx := strings.Index(nameVersion[1:], "@")
 		if idx <= 0 {
 			return "", ""
 		}
-		return nameVersion[:idx+1], rest[idx+1:]
+		versionAt = idx + 1
+	} else {
+		versionAt = strings.Index(nameVersion, "@")
+		if versionAt <= 0 {
+			return "", ""
+		}
 	}
-	idx := strings.LastIndex(nameVersion, "@")
-	if idx <= 0 {
-		return "", ""
+
+	base := nameVersion
+	if underscore := strings.Index(nameVersion[versionAt:], "_"); underscore >= 0 {
+		base = nameVersion[:versionAt+underscore]
 	}
-	return nameVersion[:idx], nameVersion[idx+1:]
+	return base[:versionAt], base[versionAt+1:]
 }
 
 func newDenoJsrPackage(location file.Location, name, version string, meta denoJsrPackage) pkg.Package {

syft/pkg/cataloger/javascript/parse_deno_lock_test.go

@@ -55,6 +55,28 @@ func TestParseDenoLock(t *testing.T) {
 				Integrity: "d3e68d0abb393fb0bf94a6d07c46ec31dc755b544b13144dee931d8d5f06a52d",
 			},
 		},
+		{
+			// npm key carries a resolved peer dependency suffix ("_typescript@6.0.3")
+			Name:     "typedoc",
+			Version:  "0.28.19",
+			PURL:     "pkg:npm/typedoc@0.28.19",
+			Language: pkg.JavaScript,
+			Type:     pkg.NpmPkg,
+			Metadata: pkg.NpmPackageLockEntry{
+				Integrity: "sha512-TYPEDOCtestfixtureintegrityAAAA==",
+			},
+		},
+		{
+			// scoped npm key with a scope-encoded ("+") peer dependency suffix
+			Name:     "@algolia/autocomplete-preset-algolia",
+			Version:  "1.17.9",
+			PURL:     "pkg:npm/%40algolia/autocomplete-preset-algolia@1.17.9",
+			Language: pkg.JavaScript,
+			Type:     pkg.NpmPkg,
+			Metadata: pkg.NpmPackageLockEntry{
+				Integrity: "sha512-ALGOLIAtestfixtureintegrityBBBB==",
+			},
+		},
 	}
 
 	for i := range expectedPkgs {

syft/pkg/cataloger/javascript/test-fixtures/deno/deno.lock

@@ -19,6 +19,12 @@
   "npm": {
     "chalk@5.3.0": {
       "integrity": "sha512-dLitG79d+GV1Nb/VYcCDFivJeK1hiukt9QjRNVOsUtTy1rR1YJsmpGGTZ3qJos+uw7WmWF4wUwBd9jxjocFC2w=="
+    },
+    "typedoc@0.28.19_typescript@6.0.3": {
+      "integrity": "sha512-TYPEDOCtestfixtureintegrityAAAA=="
+    },
+    "@algolia/autocomplete-preset-algolia@1.17.9_@algolia+client-search@5.50.0": {
+      "integrity": "sha512-ALGOLIAtestfixtureintegrityBBBB=="
     }
   },
   "remote": {