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Add PackageURL.Normalize
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For many integrations external systems use their own structured
representation of package identifiers rather than Package URLs. In
these cases it would be ideal to construct a Package URL with with
NewPackageURL a then normalize the resulting struct. It avoids the
need to render a temporary, non-canon Package URL and parse that to
achieve normalization.
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@wetterjames4
wetterjames4 committed Sep 28, 2023
1 parent ce518d7 commit 1982306
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Showing 2 changed files with 295 additions and 12 deletions.
88 changes: 79 additions & 9 deletions packageurl.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,12 @@ var (
// '-' and '_' (period, dash and underscore).
// - A key cannot start with a number.
QualifierKeyPattern = regexp.MustCompile(`^[A-Za-z\.\-_][0-9A-Za-z\.\-_]*$`)
// TypePattern describes a valid type:
//
// - The type must be composed only of ASCII letters and numbers, '.',
// '+' and '-' (period, plus and dash).
// - A type cannot start with a number.
TypePattern = regexp.MustCompile(`^[A-Za-z\.\-\+][0-9A-Za-z\.\-\+]*$`)
)

// These are the known purl types as defined in the spec. Some of these require
Expand Down Expand Up @@ -307,6 +313,33 @@ func (qq Qualifiers) String() string {
return strings.Join(kvPairs, "&")
}

func (qq *Qualifiers) Normalize() error {
qs := *qq
normedQQ := make(Qualifiers, 0, len(qs))
for _, q := range qs {
if q.Key == "" {
return fmt.Errorf("key is missing from qualifier: %v", q)
}
if q.Value == "" {
// Empty values are equivalent to the key being omitted from the PackageURL.
continue
}
key := strings.ToLower(q.Key)
if !validQualifierKey(key) {
return fmt.Errorf("invalid qualifier key: %q", key)
}
normedQQ = append(normedQQ, Qualifier{key, q.Value})
}
sort.Slice(normedQQ, func(i, j int) bool { return normedQQ[i].Key < normedQQ[j].Key })
for i := 1; i < len(normedQQ); i++ {
if normedQQ[i-1].Key == normedQQ[i].Key {
return fmt.Errorf("duplicate qualifier key: %q", normedQQ[i].Key)
}
}
*qq = normedQQ
return nil
}

// PackageURL is the struct representation of the parts that make a package url
type PackageURL struct {
Type string
Expand Down Expand Up @@ -399,13 +432,45 @@ func FromString(purl string) (PackageURL, error) {
pURL := PackageURL{
Qualifiers: qualifiers,
Type: typ,
Namespace: typeAdjustNamespace(typ, namespace),
Name: typeAdjustName(typ, name, qualifiers),
Version: typeAdjustVersion(typ, version),
Subpath: strings.Trim(u.Fragment, "/"),
Namespace: namespace,
Name: name,
Version: version,
Subpath: u.Fragment,
}

return pURL, validCustomRules(pURL)
err = pURL.Normalize()
return pURL, err
}

// Normalize converts p to its canonical form, returning an error if p is invalid.
func (p *PackageURL) Normalize() error {
typ := strings.ToLower(p.Type)
if !validType(typ) {
return fmt.Errorf("invalid type %q", typ)
}
namespace := strings.Trim(p.Namespace, "/")
if err := p.Qualifiers.Normalize(); err != nil {
return fmt.Errorf("invalid qualifiers: %v", err)
}
if p.Name == "" {
return errors.New("purl is missing name")
}
subpath := strings.Trim(p.Subpath, "/")
segs := strings.Split(p.Subpath, "/")
for _, s := range segs {
if s == "." || s == ".." {
return fmt.Errorf("invalid Package URL subpath: %q", p.Subpath)
}
}
*p = PackageURL{
Type: typ,
Namespace: typeAdjustNamespace(typ, namespace),
Name: typeAdjustName(typ, p.Name, p.Qualifiers),
Version: typeAdjustVersion(typ, p.Version),
Qualifiers: p.Qualifiers,
Subpath: subpath,
}
return validCustomRules(*p)
}

// escape the given string in a purl-compatible way.
Expand Down Expand Up @@ -477,11 +542,11 @@ func parseQualifiers(rawQuery string) (Qualifiers, error) {
return nil, fmt.Errorf("invalid qualifier key: '%s'", key)
}

if len(value) > 0 {
// only the first character needs to be lowercase. Note that pURL is always UTF8, so we
// don't need to care about unicode here.
value = strings.ToLower(value[:1]) + value[1:]
value, err = url.QueryUnescape(value)
if err != nil {
return nil, fmt.Errorf("error unescaping qualifier value %q", value)
}

q = append(q, Qualifier{
Key: strings.ToLower(key),
Value: value,
Expand Down Expand Up @@ -566,6 +631,11 @@ func validQualifierKey(key string) bool {
return QualifierKeyPattern.MatchString(key)
}

// validType validates a type against our TypePattern.
func validType(typ string) bool {
return TypePattern.MatchString(typ)
}

// validCustomRules evaluates additional rules for each package url type, as specified in the package-url specification.
// On success, it returns nil. On failure, a descriptive error will be returned.
func validCustomRules(p PackageURL) error {
Expand Down
219 changes: 216 additions & 3 deletions packageurl_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ import (
"os"
"reflect"
"regexp"
"sort"
"strings"
"testing"

Expand Down Expand Up @@ -159,8 +160,16 @@ func TestFromStringExamples(t *testing.T) {
t.Logf("%s: incorrect version: wanted: '%s', got '%s'", tc.Description, tc.Version, p.Version)
t.Fail()
}
if !reflect.DeepEqual(p.Qualifiers, tc.Qualifiers()) {
t.Logf("%s: incorrect qualifiers: wanted: '%#v', got '%#v'", tc.Description, tc.Qualifiers(), p.Qualifiers)
want := tc.Qualifiers()
sort.Slice(want, func(i, j int) bool {
return want[i].Key < want[j].Key
})
got := p.Qualifiers
sort.Slice(got, func(i, j int) bool {
return got[i].Key < got[j].Key
})
if !reflect.DeepEqual(want, got) {
t.Logf("%s: incorrect qualifiers: wanted: '%#v', got '%#v'", tc.Description, want, p.Qualifiers)
t.Fail()
}

Expand Down Expand Up @@ -321,7 +330,7 @@ func TestQualifierMissingEqual(t *testing.T) {
want := packageurl.PackageURL{
Type: "npm",
Name: "test-pkg",
Qualifiers: packageurl.Qualifiers{{Key: "key"}},
Qualifiers: packageurl.Qualifiers{},
}
got, err := packageurl.FromString(input)
if err != nil {
Expand All @@ -331,3 +340,207 @@ func TestQualifierMissingEqual(t *testing.T) {
t.Fatalf("FromString(%s): want %q got %q", input, want, got)
}
}

func TestNormalize(t *testing.T) {
testCases := []struct {
name string
input packageurl.PackageURL
want packageurl.PackageURL
wantErr bool
}{{
name: "type is case insensitive",
input: packageurl.PackageURL{
Type: "NpM",
Name: "pkg",
},
want: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{},
},
}, {
name: "type is manditory",
input: packageurl.PackageURL{
Name: "pkg",
},
wantErr: true,
}, {
name: "leading and traling / on namespace are trimmed",
input: packageurl.PackageURL{
Type: "npm",
Namespace: "/namespace/org/",
Name: "pkg",
},
want: packageurl.PackageURL{
Type: "npm",
Namespace: "namespace/org",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{},
},
}, {
name: "qualifiers with empty values are removed",
input: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{{
Key: "k1", Value: "v1",
}, {
Key: "k2", Value: "",
}, {
Key: "k3", Value: "v3",
}},
},
want: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{{
Key: "k1", Value: "v1",
}, {
Key: "k3", Value: "v3",
}},
},
}, {
name: "qualifiers are sorted by key",
input: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{{
Key: "k3", Value: "v3",
}, {
Key: "k2", Value: "v2",
}, {
Key: "k1", Value: "v1",
}},
},
want: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{{
Key: "k1", Value: "v1",
}, {
Key: "k2", Value: "v2",
}, {
Key: "k3", Value: "v3",
}},
},
}, {
name: "duplicate keys are invalid",
input: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{{
Key: "k1", Value: "v1",
}, {
Key: "k1", Value: "v2",
}},
},
wantErr: true,
}, {
name: "keys are made lower case",
input: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{{
Key: "KeY", Value: "v1",
}},
},
want: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{{
Key: "key", Value: "v1",
}},
},
}, {
name: "name is required",
input: packageurl.PackageURL{
Type: "npm",
},
wantErr: true,
}, {
name: "leading and traling / on subpath are trimmed",
input: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Subpath: "/sub/path/",
},
want: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{},
Subpath: "sub/path",
},
}, {
name: "'.' is an invalid subpath segment",
input: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Subpath: "/sub/./path/",
},
wantErr: true,
}, {
name: "'..' is an invalid subpath segment",
input: packageurl.PackageURL{
Type: "npm",
Name: "pkg",
Subpath: "/sub/../path/",
},
wantErr: true,
}, {
name: "known type namespace adjustments",
input: packageurl.PackageURL{
Type: "npm",
Namespace: "NaMeSpAcE",
Name: "pkg",
},
want: packageurl.PackageURL{
Type: "npm",
Namespace: "namespace",
Name: "pkg",
Qualifiers: packageurl.Qualifiers{},
},
}, {
name: "known type name adjustments",
input: packageurl.PackageURL{
Type: "npm",
Name: "nAmE",
},
want: packageurl.PackageURL{
Type: "npm",
Name: "name",
Qualifiers: packageurl.Qualifiers{},
},
}, {
name: "known type version adjustments",
input: packageurl.PackageURL{
Type: "huggingface",
Name: "name",
Version: "VeRsIoN",
},
want: packageurl.PackageURL{
Type: "huggingface",
Name: "name",
Version: "version",
Qualifiers: packageurl.Qualifiers{},
},
}}

for _, testCase := range testCases {
t.Run(testCase.name, func(t *testing.T) {
got := testCase.input
err := got.Normalize()
if err != nil && testCase.wantErr {
return
}
if err != nil && !testCase.wantErr {
t.Fatalf("Normalize(%s): unexpected error: %v", testCase.name, err)
}
if testCase.wantErr {
t.Fatalf("Normalize(%s): want error, got none", testCase.name)
}
if !reflect.DeepEqual(testCase.want, got) {
t.Fatalf("Normalize(%s):\nwant %#v\ngot %#v", testCase.name, testCase.want, got)
}
})
}
}

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