feat(nodejs): add yarn alias support

docs/docs/coverage/language/nodejs.md

@@ -42,7 +42,10 @@ By default, Trivy doesn't report development dependencies. Use the `--include-de
 
 ### Yarn
 Trivy parses `yarn.lock`, which doesn't contain information about development dependencies.
-To exclude devDependencies, `package.json` also needs to be present next to `yarn.lock`. 
+Trivy also uses `package.json` file to handle [aliases](https://classic.yarnpkg.com/lang/en/docs/cli/add/#toc-yarn-add-alias).
+
+To exclude devDependencies and allow aliases, `package.json` also needs to be present next to `yarn.lock`.
+
 Trivy analyzes `.yarn` (Yarn 2+) or `node_modules` (Yarn Classic) folder next to the yarn.lock file to detect licenses.
 
 By default, Trivy doesn't report development dependencies. Use the `--include-dev-deps` flag to include them.

pkg/fanal/analyzer/language/nodejs/yarn/testdata/alias/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "test",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "devDependencies": {
+    "foo-json": "npm:@types/jsonstream@0.8.33",
+    "foo-uuid": "npm:@types/uuid"
+  },
+  "dependencies": {
+    "foo-debug": "npm:debug@^4.3",
+    "foo-ms": "npm:ms"
+  }
+}

pkg/fanal/analyzer/language/nodejs/yarn/testdata/alias/yarn.lock

@@ -0,0 +1,44 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@types/node@*":
+  version "20.10.5"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-20.10.5.tgz#47ad460b514096b7ed63a1dae26fad0914ed3ab2"
+  integrity sha512-nNPsNE65wjMxEKI93yOP+NPGGBJz/PoN3kZsVLee0XMiJolxSekEVD8wRwBUBqkwc7UWop0edW50yrCQW4CyRw==
+  dependencies:
+    undici-types "~5.26.4"
+
+"foo-debug@npm:debug@^4.3":
+  version "4.3.4"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.4.tgz#1319f6579357f2338d3337d2cdd4914bb5dcc865"
+  integrity sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==
+  dependencies:
+    ms "2.1.2"
+
+"foo-json@npm:@types/jsonstream@0.8.33":
+  version "0.8.33"
+  resolved "https://registry.yarnpkg.com/@types/jsonstream/-/jsonstream-0.8.33.tgz#7d37a16a78cf68a67858110dc1767023436fca23"
+  integrity sha512-yhg1SNOgJ8y2nOkvAQ1zZ1Z2xibxgFs7984+EeBPuWgo/TbuYo79+rj2wUVch3KF4GhhcwAi/AlJcehmLCXb3g==
+  dependencies:
+    "@types/node" "*"
+
+"foo-ms@npm:ms":
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.3.tgz#574c8138ce1d2b5861f0b44579dbadd60c6615b2"
+  integrity sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==
+
+"foo-uuid@npm:@types/uuid":
+  version "9.0.7"
+  resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-9.0.7.tgz#b14cebc75455eeeb160d5fe23c2fcc0c64f724d8"
+  integrity sha512-WUtIVRUZ9i5dYXefDEAI7sh9/O7jGvHg7Df/5O/gtH3Yabe5odI3UWopVR1qbPXQtvOxWu3mM4XxlYeZtMWF4g==
+
+ms@2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
+  integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
+
+undici-types@~5.26.4:
+  version "5.26.5"
+  resolved "https://registry.yarnpkg.com/undici-types/-/undici-types-5.26.5.tgz#bcd539893d00b56e964fd2657a4866b221a65617"
+  integrity sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==

pkg/fanal/analyzer/language/nodejs/yarn/yarn.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"regexp"
 	"sort"
 	"strings"
 
@@ -36,6 +37,10 @@ func init() {
 
 const version = 2
 
+// Taken from Yarn
+// cf. https://github.com/yarnpkg/yarn/blob/328fd596de935acc6c3e134741748fcc62ec3739/src/resolvers/exotics/registry-resolver.js#L12
+var fragmentRegexp = regexp.MustCompile(`(\S+):(@?.*?)(@(.*?)|)$`)
+
 type yarnAnalyzer struct {
 	packageJsonParser *packagejson.Parser
 	lockParser        godeptypes.Parser
@@ -193,17 +198,30 @@ func (a yarnAnalyzer) walkDependencies(libs []types.Package, pkgIDs map[string]t
 	// Identify direct dependencies
 	pkgs := make(map[string]types.Package)
 	for _, pkg := range libs {
-		if constraint, ok := directDeps[pkg.Name]; ok {
-			// npm has own comparer to compare versions
-			if match, err := a.comparer.MatchVersion(pkg.Version, constraint); err != nil {
-				return nil, xerrors.Errorf("unable to match version for %s", pkg.Name)
-			} else if match {
-				// Mark as a direct dependency
-				pkg.Indirect = false
-				pkg.Dev = dev
-				pkgs[pkg.ID] = pkg
-			}
+		constraint, ok := directDeps[pkg.Name]
+		if !ok {
+			continue
+		}
+
+		// Handle aliases
+		// cf. https://classic.yarnpkg.com/lang/en/docs/cli/add/#toc-yarn-add-alias
+		if m := fragmentRegexp.FindStringSubmatch(constraint); len(m) == 5 {
+			pkg.Name = m[2] // original name
+			constraint = m[4]
 		}
+
+		// npm has own comparer to compare versions
+		if match, err := a.comparer.MatchVersion(pkg.Version, constraint); err != nil {
+			return nil, xerrors.Errorf("unable to match version for %s", pkg.Name)
+		} else if !match {
+			continue
+		}
+
+		// Mark as a direct dependency
+		pkg.Indirect = false
+		pkg.Dev = dev
+		pkgs[pkg.ID] = pkg
+
 	}
 
 	// Walk indirect dependencies

pkg/fanal/analyzer/language/nodejs/yarn/yarn_test.go

@@ -318,6 +318,117 @@ func Test_yarnLibraryAnalyzer_Analyze(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "happy path with alias rewrite",
+			dir:  "testdata/alias",
+			want: &analyzer.AnalysisResult{
+				Applications: []types.Application{
+					{
+						Type:     types.Yarn,
+						FilePath: "yarn.lock",
+						Libraries: types.Packages{
+							{
+								ID:       "foo-json@0.8.33",
+								Name:     "@types/jsonstream",
+								Version:  "0.8.33",
+								Indirect: false,
+								Dev:      true,
+								Locations: []types.Location{
+									{
+										StartLine: 19,
+										EndLine:   24,
+									},
+								},
+								DependsOn: []string{
+									"@types/node@20.10.5",
+								},
+							},
+							{
+								ID:       "@types/node@20.10.5",
+								Name:     "@types/node",
+								Version:  "20.10.5",
+								Indirect: true,
+								Dev:      true,
+								Locations: []types.Location{
+									{
+										StartLine: 5,
+										EndLine:   10,
+									},
+								},
+								DependsOn: []string{
+									"undici-types@5.26.5",
+								},
+							},
+							{
+								ID:       "foo-uuid@9.0.7",
+								Name:     "@types/uuid",
+								Version:  "9.0.7",
+								Indirect: false,
+								Dev:      true,
+								Locations: []types.Location{
+									{
+										StartLine: 31,
+										EndLine:   34,
+									},
+								},
+							},
+							{
+								ID:       "foo-debug@4.3.4",
+								Name:     "debug",
+								Version:  "4.3.4",
+								Indirect: false,
+								Locations: []types.Location{
+									{
+										StartLine: 12,
+										EndLine:   17,
+									},
+								},
+								DependsOn: []string{
+									"ms@2.1.2",
+								},
+							},
+							{
+								ID:       "ms@2.1.2",
+								Name:     "ms",
+								Version:  "2.1.2",
+								Indirect: true,
+								Locations: []types.Location{
+									{
+										StartLine: 36,
+										EndLine:   39,
+									},
+								},
+							},
+							{
+								ID:       "foo-ms@2.1.3",
+								Name:     "ms",
+								Version:  "2.1.3",
+								Indirect: false,
+								Locations: []types.Location{
+									{
+										StartLine: 26,
+										EndLine:   29,
+									},
+								},
+							},
+							{
+								ID:       "undici-types@5.26.5",
+								Name:     "undici-types",
+								Version:  "5.26.5",
+								Indirect: true,
+								Dev:      true,
+								Locations: []types.Location{
+									{
+										StartLine: 41,
+										EndLine:   44,
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
 		{
 			name: "monorepo",
 			dir:  "testdata/monorepo",