add apk analyzer

Author: tomoyamachi

analyzer/analyzer.go

@@ -88,5 +88,8 @@ func GetPackages(filesMap extractor.FilesMap) ([]Package, error) {
 		return pkgs, nil
 	}
 	return nil, ErrUnknownOS
+}
 
+func CheckPackage(pkg *Package) bool {
+	return pkg.Name != "" && pkg.Version != ""
 }

analyzer/pkg/apk/apk.go

@@ -3,11 +3,14 @@ package apk
 import (
 	"bufio"
 	"bytes"
-	"fmt"
+
+	"github.com/labstack/gommon/log"
+
+	"github.com/coreos/clair/ext/versionfmt"
+	clairDpkg "github.com/coreos/clair/ext/versionfmt/dpkg"
 
 	"github.com/knqyf263/fanal/analyzer"
 	"github.com/knqyf263/fanal/extractor"
-	"github.com/pkg/errors"
 )
 
 func init() {
@@ -16,20 +19,54 @@ func init() {
 
 type alpinePkgAnalyzer struct{}
 
-func (a alpinePkgAnalyzer) Analyze(filesMap extractor.FilesMap) ([]analyzer.Package, error) {
+func (a alpinePkgAnalyzer) Analyze(filesMap extractor.FilesMap) (pkgs []analyzer.Package, err error) {
+	var parsedPkgs []analyzer.Package
 	for _, filename := range a.RequiredFiles() {
 		file, ok := filesMap[filename]
 		if !ok {
 			continue
 		}
 		scanner := bufio.NewScanner(bytes.NewBuffer(file))
-		for scanner.Scan() {
-			// TODO
-			line := scanner.Text()
-			fmt.Println(line)
+		parsedPkgs, err = a.parseApkInfo(scanner)
+		pkgs = append(pkgs, parsedPkgs...)
+	}
+	return pkgs, err
+}
+
+func (a alpinePkgAnalyzer) parseApkInfo(scanner *bufio.Scanner) (pkgs []analyzer.Package, err error) {
+	var pkg analyzer.Package
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		// check package if paragraph end
+		if len(line) < 2 {
+			if analyzer.CheckPackage(&pkg) {
+				pkgs = append(pkgs, pkg)
+			}
+			pkg = analyzer.Package{}
+			continue
+		}
+
+		switch line[:2] {
+		case "P:":
+			pkg.Name = line[2:]
+		case "V:":
+			version := string(line[2:])
+			err = versionfmt.Valid(clairDpkg.ParserName, version)
+			if err != nil {
+				log.Warnf("Invalid Version Found : OS %s, Package %s, Version %s", "alpine", pkg.Name, version)
+				continue
+			} else {
+				pkg.Version = version
+			}
 		}
 	}
-	return []analyzer.Package{}, errors.New("alpine: Not match")
+	// in case of last paragraph
+	if analyzer.CheckPackage(&pkg) {
+		pkgs = append(pkgs, pkg)
+	}
+
+	return pkgs, nil
 }
 
 func (a alpinePkgAnalyzer) RequiredFiles() []string {

analyzer/pkg/apk/apk_test.go

@@ -0,0 +1,49 @@
+package apk
+
+import (
+	"bufio"
+	"os"
+	"reflect"
+	"testing"
+
+	"github.com/knqyf263/fanal/analyzer"
+)
+
+func TestParseApkInfo(t *testing.T) {
+	var tests = map[string]struct {
+		path string
+		pkgs []analyzer.Package
+	}{
+		"Valid": {
+			path: "./testdata/apk",
+			pkgs: []analyzer.Package{
+				{Name: "musl", Version: "1.1.14-r10"},
+				{Name: "busybox", Version: "1.24.2-r9"},
+				{Name: "alpine-baselayout", Version: "3.0.3-r0"},
+				{Name: "alpine-keys", Version: "1.1-r0"},
+				{Name: "zlib", Version: "1.2.8-r2"},
+				{Name: "libcrypto1.0", Version: "1.0.2h-r1"},
+				{Name: "libssl1.0", Version: "1.0.2h-r1"},
+				{Name: "apk-tools", Version: "2.6.7-r0"},
+				{Name: "scanelf", Version: "1.1.6-r0"},
+				{Name: "musl-utils", Version: "1.1.14-r10"},
+				{Name: "libc-utils", Version: "0.7-r0"},
+			},
+		},
+	}
+	a := alpinePkgAnalyzer{}
+	for i, v := range tests {
+		read, err := os.Open(v.path)
+		if err != nil {
+			t.Errorf("%s : can't open file %s", i, v.path)
+		}
+		scanner := bufio.NewScanner(read)
+		pkgs, err := a.parseApkInfo(scanner)
+		if err != nil {
+			t.Errorf("%s : catch the error : %v", i, err)
+		}
+		if !reflect.DeepEqual(v.pkgs, pkgs) {
+			t.Errorf("[%s]\nexpected : %v\nactual : %v", i, v.pkgs, pkgs)
+		}
+	}
+}