pkg.JavaArchive.PomProperties is being populated even though no pom.properties file was present for analysis

syft/format/internal/backfill.go

@@ -71,31 +71,14 @@ func Backfill(p *pkg.Package) {
 	}
 }
 
-func setJavaMetadataFromPurl(p *pkg.Package, purl packageurl.PackageURL) {
+func setJavaMetadataFromPurl(p *pkg.Package, _ packageurl.PackageURL) {
 	if p.Type != pkg.JavaPkg {
 		return
 	}
-	if purl.Namespace != "" {
-		if p.Metadata == nil {
-			p.Metadata = pkg.JavaArchive{}
-		}
-		meta, got := p.Metadata.(pkg.JavaArchive)
-		if got && meta.PomProperties == nil {
-			meta.PomProperties = &pkg.JavaPomProperties{}
-			p.Metadata = meta
-		}
-		if meta.PomProperties != nil {
-			// capture the group id from the purl if it is not already set
-			if meta.PomProperties.ArtifactID == "" {
-				meta.PomProperties.ArtifactID = purl.Name
-			}
-			if meta.PomProperties.GroupID == "" {
-				meta.PomProperties.GroupID = purl.Namespace
-			}
-			if meta.PomProperties.Version == "" {
-				meta.PomProperties.Version = purl.Version
-			}
-		}
+	if p.Metadata == nil {
+		// since we don't know if the purl elements directly came from pom properties or the manifest,
+		// we can only go as far as to set the type to JavaArchive, but not fill in the group id and artifact id
+		p.Metadata = pkg.JavaArchive{}
 	}
 }
 

syft/format/internal/backfill_test.go

@@ -101,13 +101,9 @@ func Test_Backfill(t *testing.T) {
 				Language: pkg.Java,
 				Name:     "some-thing",
 				Version:  "1.2.3",
-				Metadata: pkg.JavaArchive{
-					PomProperties: &pkg.JavaPomProperties{
-						GroupID:    "org.apache",
-						ArtifactID: "some-thing",
-						Version:    "1.2.3",
-					},
-				},
+				// we intentionally don't claim we found a pom properties file with a groupID from the purl.
+				// but we do claim that we found java data with an empty type.
+				Metadata: pkg.JavaArchive{},
 			},
 		},
 	}

syft/format/internal/cyclonedxutil/helpers/component.go

@@ -3,6 +3,7 @@ package helpers
 import (
 	"fmt"
 	"reflect"
+	"strings"
 
 	"github.com/CycloneDX/cyclonedx-go"
 
@@ -90,15 +91,19 @@ func decodeComponent(c *cyclonedx.Component) *pkg.Package {
 		Locations: decodeLocations(values),
 		Licenses:  pkg.NewLicenseSet(decodeLicenses(c)...),
 		CPEs:      decodeCPEs(c),
-		PURL:      c.PackageURL,
 	}
 
+	// note: this may write in syft package type information
 	DecodeInto(p, values, "syft:package", CycloneDXFields)
 
 	metadataType := values["syft:package:metadataType"]
 
 	p.Metadata = decodePackageMetadata(values, c, metadataType)
 
+	// this will either use the purl from the component or generate a new one based off of any type information
+	// that was decoded above.
+	p.PURL = getPURL(c, p.Type)
+
 	if p.Type == "" {
 		p.Type = pkg.TypeFromPURL(p.PURL)
 	}
@@ -111,6 +116,41 @@ func decodeComponent(c *cyclonedx.Component) *pkg.Package {
 	return p
 }
 
+func getPURL(c *cyclonedx.Component, ty pkg.Type) string {
+	if c.PackageURL != "" {
+		// if there is a purl that where the namespace does not match the group information, we may
+		// accidentally drop group. We should consider adding group as a top-level syft package field.
+		return c.PackageURL
+	}
+
+	if strings.HasPrefix(c.BOMRef, "pkg:") {
+		// the bomref is a purl, so try to use that as the purl
+		_, err := packageurl.FromString(c.BOMRef)
+		if err == nil {
+			return c.BOMRef
+		}
+	}
+
+	if ty == "" {
+		return ""
+	}
+
+	tyStr := ty.PackageURLType()
+	switch tyStr {
+	case "", packageurl.TypeGeneric:
+		return ""
+	}
+
+	purl := packageurl.PackageURL{
+		Type:      tyStr,
+		Namespace: c.Group,
+		Name:      c.Name,
+		Version:   c.Version,
+	}
+
+	return purl.ToString()
+}
+
 func setPackageName(p *pkg.Package, c *cyclonedx.Component) {
 	name := c.Name
 	if c.Group != "" {

syft/format/internal/cyclonedxutil/helpers/component_test.go

@@ -275,6 +275,7 @@ func Test_decodeComponent(t *testing.T) {
 		component    cyclonedx.Component
 		wantLanguage pkg.Language
 		wantMetadata any
+		wantPURL     string
 	}{
 		{
 			name: "derive language from pURL if missing",
@@ -286,6 +287,18 @@ func Test_decodeComponent(t *testing.T) {
 				BOMRef:     "pkg:maven/ch.qos.logback/logback-classic@1.2.3",
 			},
 			wantLanguage: pkg.Java,
+			wantPURL:     "pkg:maven/ch.qos.logback/logback-classic@1.2.3",
+		},
+		{
+			name: "derive language from bomref if missing",
+			component: cyclonedx.Component{
+				Name:    "ch.qos.logback/logback-classic",
+				Version: "1.2.3",
+				Type:    "library",
+				BOMRef:  "pkg:maven/ch.qos.logback/logback-classic@1.2.3",
+			},
+			wantLanguage: pkg.Java,
+			wantPURL:     "pkg:maven/ch.qos.logback/logback-classic@1.2.3",
 		},
 		{
 			name: "handle RpmdbMetadata type without properties",
@@ -303,6 +316,7 @@ func Test_decodeComponent(t *testing.T) {
 				},
 			},
 			wantMetadata: pkg.RpmDBEntry{},
+			wantPURL:     "pkg:rpm/centos/acl@2.2.53-1.el8?arch=x86_64&upstream=acl-2.2.53-1.el8.src.rpm&distro=centos-8",
 		},
 		{
 			name: "handle RpmdbMetadata type with properties",
@@ -326,6 +340,24 @@ func Test_decodeComponent(t *testing.T) {
 			wantMetadata: pkg.RpmDBEntry{
 				Release: "some-release",
 			},
+			wantPURL: "pkg:rpm/centos/acl@2.2.53-1.el8?arch=x86_64&upstream=acl-2.2.53-1.el8.src.rpm&distro=centos-8",
+		},
+		{
+			name: "generate a purl from package type",
+			component: cyclonedx.Component{
+				Name:    "log4j",
+				Group:   "org.apache.logging.log4j",
+				Version: "2.0.4",
+				Type:    "library",
+				BOMRef:  "log4j",
+				Properties: &[]cyclonedx.Property{
+					{
+						Name:  "syft:package:type",
+						Value: "java-archive",
+					},
+				},
+			},
+			wantPURL: "pkg:maven/org.apache.logging.log4j/log4j@2.0.4",
 		},
 	}
 
@@ -338,9 +370,122 @@ func Test_decodeComponent(t *testing.T) {
 			if tt.wantMetadata != nil {
 				assert.Truef(t, reflect.DeepEqual(tt.wantMetadata, p.Metadata), "metadata should match: %+v != %+v", tt.wantMetadata, p.Metadata)
 			}
-			if tt.wantMetadata == nil && tt.wantLanguage == "" {
+
+			if tt.wantPURL != "" {
+				assert.Equal(t, tt.wantPURL, p.PURL, "purl should match")
+			}
+
+			if tt.wantMetadata == nil && tt.wantLanguage == "" && tt.wantPURL == "" {
 				t.Fatal("this is a useless test, please remove it")
 			}
 		})
 	}
 }
+
+func TestGetPURL(t *testing.T) {
+	tests := []struct {
+		name      string
+		component *cyclonedx.Component
+		pkgType   pkg.Type
+		expected  string
+	}{
+		{
+			name: "component with PackageURL",
+			component: &cyclonedx.Component{
+				PackageURL: "pkg:npm/lodash@4.17.21",
+				Name:       "lodash",
+				Version:    "4.17.20", // different version to verify PackageURL is used
+				Group:      "npm",
+			},
+			pkgType:  pkg.NpmPkg,
+			expected: "pkg:npm/lodash@4.17.21",
+		},
+		{
+			name: "component with BOMRef as valid PURL",
+			component: &cyclonedx.Component{
+				BOMRef:  "pkg:maven/org.apache.commons/commons-lang3@3.12.0",
+				Name:    "commons-lang3",
+				Version: "3.11.0", // different version to verify BOMRef is used
+				Group:   "org.apache.commons",
+			},
+			pkgType:  pkg.JavaPkg,
+			expected: "pkg:maven/org.apache.commons/commons-lang3@3.12.0",
+		},
+		{
+			name: "component with BOMRef not a valid PURL",
+			component: &cyclonedx.Component{
+				BOMRef:  "not-a-purl-ref",
+				Name:    "commons-lang3",
+				Version: "3.12.0",
+				Group:   "org.apache.commons",
+			},
+			pkgType:  pkg.JavaPkg,
+			expected: "pkg:maven/org.apache.commons/commons-lang3@3.12.0",
+		},
+		{
+			name: "component with unknown package type",
+			component: &cyclonedx.Component{
+				Name:    "some-component",
+				Version: "1.0.0",
+				Group:   "org.example",
+			},
+			pkgType:  pkg.UnknownPkg,
+			expected: "",
+		},
+		{
+			name: "component with empty package type",
+			component: &cyclonedx.Component{
+				Name:    "some-component",
+				Version: "1.0.0",
+				Group:   "org.example",
+			},
+			pkgType:  "",
+			expected: "",
+		},
+		{
+			name: "component with generic package type",
+			component: &cyclonedx.Component{
+				Name:    "some-component",
+				Version: "1.0.0",
+				Group:   "org.example",
+			},
+			pkgType:  pkg.LinuxKernelModulePkg,
+			expected: "",
+		},
+		{
+			name: "component with valid package type",
+			component: &cyclonedx.Component{
+				Name:    "react",
+				Version: "18.2.0",
+				Group:   "facebook",
+			},
+			pkgType:  pkg.NpmPkg,
+			expected: "pkg:npm/facebook/react@18.2.0",
+		},
+		{
+			name: "component with no group",
+			component: &cyclonedx.Component{
+				Name:    "express",
+				Version: "4.18.2",
+			},
+			pkgType:  pkg.NpmPkg,
+			expected: "pkg:npm/express@4.18.2",
+		},
+		{
+			name: "component with no version",
+			component: &cyclonedx.Component{
+				Name:  "express",
+				Group: "npm",
+			},
+			pkgType:  pkg.NpmPkg,
+			expected: "pkg:npm/npm/express",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := getPURL(tt.component, tt.pkgType)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}

syft/format/purls/decoder_test.go

@@ -165,13 +165,9 @@ func TestDecoder_Decode(t *testing.T) {
 					Type:     pkg.JavaPkg,
 					PURL:     "pkg:maven/org.apache/some-pkg@4.11.3",
 					Language: pkg.Java,
-					Metadata: pkg.JavaArchive{
-						PomProperties: &pkg.JavaPomProperties{
-							GroupID:    "org.apache",
-							ArtifactID: "some-pkg",
-							Version:    "4.11.3",
-						},
-					},
+					// we intentionally do not claim we found a pom properties file (don't derive this from the purl).
+					// but we need a metadata allocated since all Java packages have a this metadata type (a consistency point)
+					Metadata: pkg.JavaArchive{},
 				},
 			},
 		},

syft/pkg/cataloger/redhat/parse_rpm_archive.go

@@ -10,9 +10,9 @@ import (
 	"strconv"
 	"time"
 
-	rpmdb "github.com/anchore/go-rpmdb/pkg"
 	"github.com/sassoftware/go-rpmutils"
 
+	rpmdb "github.com/anchore/go-rpmdb/pkg"
 	"github.com/anchore/syft/internal/log"
 	"github.com/anchore/syft/syft/artifact"
 	"github.com/anchore/syft/syft/file"

syft/pkg/cataloger/redhat/parse_rpm_db.go

@@ -9,7 +9,6 @@ import (
 	"strings"
 
 	rpmdb "github.com/anchore/go-rpmdb/pkg"
-
 	"github.com/anchore/syft/internal/log"
 	"github.com/anchore/syft/internal/unknown"
 	"github.com/anchore/syft/syft/artifact"