wire up composer pURL method

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

syft/pkg/php_composer_json_metadata.go

@@ -4,8 +4,11 @@ import (
 	"strings"
 
 	"github.com/anchore/packageurl-go"
+	"github.com/anchore/syft/syft/linux"
 )
 
+var _ urlIdentifier = (*PhpComposerJSONMetadata)(nil)
+
 // PhpComposerJSONMetadata represents information found from composer v1/v2 "installed.json" files as well as composer.lock files
 type PhpComposerJSONMetadata struct {
 	Name            string                       `json:"name"`
@@ -40,7 +43,7 @@ type PhpComposerAuthors struct {
 	Homepage string `json:"homepage,omitempty"`
 }
 
-func (m PhpComposerJSONMetadata) PackageURL() string {
+func (m PhpComposerJSONMetadata) PackageURL(_ *linux.Release) string {
 	var name, vendor string
 	fields := strings.Split(m.Name, "/")
 	switch len(fields) {

syft/pkg/php_composer_json_metadata_test.go

@@ -20,7 +20,8 @@ func TestPhpComposerJsonMetadata_pURL(t *testing.T) {
 				Version: "1.0.1",
 			},
 			expected: "pkg:composer/ven/name@1.0.1",
-		}, {
+		},
+		{
 			name: "name with slashes (invalid)",
 			metadata: PhpComposerJSONMetadata{
 				Name:    "ven/name/component",
@@ -36,11 +37,23 @@ func TestPhpComposerJsonMetadata_pURL(t *testing.T) {
 			},
 			expected: "pkg:composer/name@1.0.1",
 		},
+		{
+			name: "ignores distro",
+			distro: &linux.Release{
+				ID:        "rhel",
+				VersionID: "8.4",
+			},
+			metadata: PhpComposerJSONMetadata{
+				Name:    "ven/name",
+				Version: "1.0.1",
+			},
+			expected: "pkg:composer/ven/name@1.0.1",
+		},
 	}
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			actual := test.metadata.PackageURL()
+			actual := test.metadata.PackageURL(test.distro)
 			if actual != test.expected {
 				dmp := diffmatchpatch.New()
 				diffs := dmp.DiffMain(test.expected, actual, true)