/
parse.go
160 lines (138 loc) · 4.76 KB
/
parse.go
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package poetry
import (
"sort"
"strings"
"github.com/BurntSushi/toml"
"golang.org/x/xerrors"
version "github.com/aquasecurity/go-pep440-version"
"github.com/aquasecurity/trivy/pkg/dependency"
"github.com/aquasecurity/trivy/pkg/dependency/types"
ftypes "github.com/aquasecurity/trivy/pkg/fanal/types"
"github.com/aquasecurity/trivy/pkg/log"
xio "github.com/aquasecurity/trivy/pkg/x/io"
)
type Lockfile struct {
Packages []struct {
Category string `toml:"category"`
Description string `toml:"description"`
Marker string `toml:"marker,omitempty"`
Name string `toml:"name"`
Optional bool `toml:"optional"`
PythonVersions string `toml:"python-versions"`
Version string `toml:"version"`
Dependencies map[string]interface{} `toml:"dependencies"`
Metadata interface{}
} `toml:"package"`
}
type Parser struct{}
func NewParser() types.Parser {
return &Parser{}
}
func (p *Parser) Parse(r xio.ReadSeekerAt) ([]types.Library, []types.Dependency, error) {
var lockfile Lockfile
if _, err := toml.NewDecoder(r).Decode(&lockfile); err != nil {
return nil, nil, xerrors.Errorf("failed to decode poetry.lock: %w", err)
}
// Keep all installed versions
libVersions := parseVersions(lockfile)
var libs []types.Library
var deps []types.Dependency
for _, pkg := range lockfile.Packages {
if pkg.Category == "dev" {
continue
}
pkgID := packageID(pkg.Name, pkg.Version)
libs = append(libs, types.Library{
ID: pkgID,
Name: pkg.Name,
Version: pkg.Version,
})
dependsOn := parseDependencies(pkg.Dependencies, libVersions)
if len(dependsOn) != 0 {
deps = append(deps, types.Dependency{
ID: pkgID,
DependsOn: dependsOn,
})
}
}
return libs, deps, nil
}
// parseVersions stores all installed versions of libraries for use in dependsOn
// as the dependencies of libraries use version range.
func parseVersions(lockfile Lockfile) map[string][]string {
libVersions := make(map[string][]string)
for _, pkg := range lockfile.Packages {
if pkg.Category == "dev" {
continue
}
if vers, ok := libVersions[pkg.Name]; ok {
libVersions[pkg.Name] = append(vers, pkg.Version)
} else {
libVersions[pkg.Name] = []string{pkg.Version}
}
}
return libVersions
}
func parseDependencies(deps map[string]any, libVersions map[string][]string) []string {
var dependsOn []string
for name, versRange := range deps {
if dep, err := parseDependency(name, versRange, libVersions); err != nil {
log.Logger.Debugf("failed to parse poetry dependency: %s", err)
} else if dep != "" {
dependsOn = append(dependsOn, dep)
}
}
sort.Slice(dependsOn, func(i, j int) bool {
return dependsOn[i] < dependsOn[j]
})
return dependsOn
}
func parseDependency(name string, versRange any, libVersions map[string][]string) (string, error) {
name = normalizePkgName(name)
vers, ok := libVersions[name]
if !ok {
return "", xerrors.Errorf("no version found for %q", name)
}
for _, ver := range vers {
var vRange string
switch r := versRange.(type) {
case string:
vRange = r
case map[string]interface{}:
for k, v := range r {
if k == "version" {
vRange = v.(string)
}
}
}
if matched, err := matchVersion(ver, vRange); err != nil {
return "", xerrors.Errorf("failed to match version for %s: %w", name, err)
} else if matched {
return packageID(name, ver), nil
}
}
return "", xerrors.Errorf("no matched version found for %q", name)
}
// matchVersion checks if the package version satisfies the given constraint.
func matchVersion(currentVersion, constraint string) (bool, error) {
v, err := version.Parse(currentVersion)
if err != nil {
return false, xerrors.Errorf("python version error (%s): %s", currentVersion, err)
}
c, err := version.NewSpecifiers(constraint, version.WithPreRelease(true))
if err != nil {
return false, xerrors.Errorf("python constraint error (%s): %s", constraint, err)
}
return c.Check(v), nil
}
func normalizePkgName(name string) string {
// The package names don't use `_`, `.` or upper case, but dependency names can contain them.
// We need to normalize those names.
name = strings.ToLower(name) // e.g. https://github.com/python-poetry/poetry/blob/c8945eb110aeda611cc6721565d7ad0c657d453a/poetry.lock#L819
name = strings.ReplaceAll(name, "_", "-") // e.g. https://github.com/python-poetry/poetry/blob/c8945eb110aeda611cc6721565d7ad0c657d453a/poetry.lock#L50
name = strings.ReplaceAll(name, ".", "-") // e.g. https://github.com/python-poetry/poetry/blob/c8945eb110aeda611cc6721565d7ad0c657d453a/poetry.lock#L816
return name
}
func packageID(name, ver string) string {
return dependency.ID(ftypes.Poetry, name, ver)
}