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Add semver.compare & is_valid built-ins

Browse Source 
These built-ins will allow policies to more easily make comparisons on
semantic version strings.

I am doing this because I recently needed to write policy concerning
versions of installed software in Kubernetes environments.

I feel this is a better solution than implementing such a feature in
Rego: https://gist.github.com/charlieegan3/76dbec05c65164ac98dfec74b1381c5a

is_valid is to allow users to gate access to the compare function which
fails if the input is not a valid version string.

The semver functionality is vendored from the coreos package based on
the discussion here:
https://github.com/open-policy-agent/opa/pull/2538#pullrequestreview-448422711

Signed-off-by: Charlie Egan <charlieegan3@users.noreply.github.com>
This commit is contained in:
Charlie Egan
2020-07-13 14:51:43 +01:00
committed by Patrick East
parent 9940f9ef8f
commit 8d321f0856
8 changed files with 711 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ast/builtins.go
+30
View File
@@ -226,6 +226,10 @@ var DefaultBuiltins = [...]*Builtin{
// UUIDs
UUIDRFC4122,
//SemVers
SemVerIsValid,
SemVerCompare,
}
// BuiltinMap provides a convenient mapping of built-in names to
@@ -2067,6 +2071,32 @@ var ObjectGet = &Builtin{
),
}
// SemVerIsValid validiates a the term is a valid SemVer as a string, returns
// false for all other input
var SemVerIsValid = &Builtin{
Name: "semver.is_valid",
Decl: types.NewFunction(
types.Args(
types.A,
),
types.B,
),
}
// SemVerCompare compares valid SemVer formatted version strings. Given two
// version strings, if A < B returns -1, if A > B returns 1. If A == B, returns
// 0
var SemVerCompare = &Builtin{
Name: "semver.compare",
Decl: types.NewFunction(
types.Args(
types.S,
types.S,
),
types.N,
),
}
// Builtin represents a built-in function supported by OPA. Every built-in
// function is uniquely identified by a name.
type Builtin struct {
docs/content/policy-reference.md
+6
View File
@@ -952,6 +952,12 @@ net.cidr_contains_matches({["1.1.0.0/16", "foo"], "1.1.2.0/24"}, {"x": "1.1.1.12
| ------- |-------------|
| <span class="opa-keep-it-together">``output := uuid.rfc4122(str)``</span> | ``output`` is ``string`` representing a version 4 uuid. For any given str the output will be consistent throughout a query evaluation. |
### Semantic Versions
| Built-in | Description |
| ------- |-------------|
| <span class="opa-keep-it-together">``output := semver.is_valid(str)``</span> | ``output`` is a ``boolean``. ``true`` means the input is a valid SemVer string (e.g. "1.0.0"). ``false`` is returned for invalid version strings and non-string input. |
| <span class="opa-keep-it-together">``output := semver.compare(str, str)``</span> | ``output`` is a ``number``. ``-1`` means the version in the first operand is less than the second. ``1`` means the version in the first operand is greater than the second. ``0`` means the versions are equal. Only valid SemVer strings are accepted e.g. ``1.2.3`` or ``0.1.0`` |
### Rego
| Built-in | Description |
| ------- |-------------|
go.mod
+1 -1
View File
@@ -31,5 +31,5 @@ require (
golang.org/x/lint v0.0.0-20181023182221-1baf3a9d7d67
golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72
gopkg.in/fsnotify.v1 v1.4.7
gopkg.in/yaml.v2 v2.2.1 // indirect
gopkg.in/yaml.v2 v2.2.1
)
internal/semver/LICENSE
+202
View File
@@ -0,0 +1,202 @@
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internal/semver/semver.go
+235
View File
@@ -0,0 +1,235 @@
// Copyright 2013-2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Semantic Versions http://semver.org
// Package semver has been vendored from:
// https://github.com/coreos/go-semver/tree/e214231b295a8ea9479f11b70b35d5acf3556d9b/semver
// A number of the original functions of the package have been removed since
// they are not required for our built-ins.
package semver
import (
"bytes"
"fmt"
"regexp"
"strconv"
"strings"
)
// Version represents a parsed SemVer
type Version struct {
Major int64
Minor int64
Patch int64
PreRelease PreRelease
Metadata string
}
// PreRelease represents a pre-release suffix string
type PreRelease string
func splitOff(input *string, delim string) (val string) {
parts := strings.SplitN(*input, delim, 2)
if len(parts) == 2 {
*input = parts[0]
val = parts[1]
}
return val
}
// NewVersion constucts new SemVers from strings
func NewVersion(version string) (*Version, error) {
v := Version{}
if err := v.Set(version); err != nil {
return nil, err
}
return &v, nil
}
// Set parses and updates v from the given version string. Implements flag.Value
func (v *Version) Set(version string) error {
metadata := splitOff(&version, "+")
preRelease := PreRelease(splitOff(&version, "-"))
dotParts := strings.SplitN(version, ".", 3)
if len(dotParts) != 3 {
return fmt.Errorf("%s is not in dotted-tri format", version)
}
if err := validateIdentifier(string(preRelease)); err != nil {
return fmt.Errorf("failed to validate pre-release: %v", err)
}
if err := validateIdentifier(metadata); err != nil {
return fmt.Errorf("failed to validate metadata: %v", err)
}
parsed := make([]int64, 3, 3)
for i, v := range dotParts[:3] {
val, err := strconv.ParseInt(v, 10, 64)
parsed[i] = val
if err != nil {
return err
}
}
v.Metadata = metadata
v.PreRelease = preRelease
v.Major = parsed[0]
v.Minor = parsed[1]
v.Patch = parsed[2]
return nil
}
func (v Version) String() string {
var buffer bytes.Buffer
fmt.Fprintf(&buffer, "%d.%d.%d", v.Major, v.Minor, v.Patch)
if v.PreRelease != "" {
fmt.Fprintf(&buffer, "-%s", v.PreRelease)
}
if v.Metadata != "" {
fmt.Fprintf(&buffer, "+%s", v.Metadata)
}
return buffer.String()
}
// Compare tests if v is less than, equal to, or greater than versionB,
// returning -1, 0, or +1 respectively.
func (v Version) Compare(versionB Version) int {
if cmp := recursiveCompare(v.Slice(), versionB.Slice()); cmp != 0 {
return cmp
}
return preReleaseCompare(v, versionB)
}
// Slice converts the comparable parts of the semver into a slice of integers.
func (v Version) Slice() []int64 {
return []int64{v.Major, v.Minor, v.Patch}
}
// Slice splits the pre-release suffix string
func (p PreRelease) Slice() []string {
preRelease := string(p)
return strings.Split(preRelease, ".")
}
func preReleaseCompare(versionA Version, versionB Version) int {
a := versionA.PreRelease
b := versionB.PreRelease
/* Handle the case where if two versions are otherwise equal it is the
* one without a PreRelease that is greater */
if len(a) == 0 && (len(b) > 0) {
return 1
} else if len(b) == 0 && (len(a) > 0) {
return -1
}
// If there is a prerelease, check and compare each part.
return recursivePreReleaseCompare(a.Slice(), b.Slice())
}
func recursiveCompare(versionA []int64, versionB []int64) int {
if len(versionA) == 0 {
return 0
}
a := versionA[0]
b := versionB[0]
if a > b {
return 1
} else if a < b {
return -1
}
return recursiveCompare(versionA[1:], versionB[1:])
}
func recursivePreReleaseCompare(versionA []string, versionB []string) int {
// A larger set of pre-release fields has a higher precedence than a smaller set,
// if all of the preceding identifiers are equal.
if len(versionA) == 0 {
if len(versionB) > 0 {
return -1
}
return 0
} else if len(versionB) == 0 {
// We're longer than versionB so return 1.
return 1
}
a := versionA[0]
b := versionB[0]
aInt := false
bInt := false
aI, err := strconv.Atoi(versionA[0])
if err == nil {
aInt = true
}
bI, err := strconv.Atoi(versionB[0])
if err == nil {
bInt = true
}
// Numeric identifiers always have lower precedence than non-numeric identifiers.
if aInt && !bInt {
return -1
} else if !aInt && bInt {
return 1
}
// Handle Integer Comparison
if aInt && bInt {
if aI > bI {
return 1
} else if aI < bI {
return -1
}
}
// Handle String Comparison
if a > b {
return 1
} else if a < b {
return -1
}
return recursivePreReleaseCompare(versionA[1:], versionB[1:])
}
// validateIdentifier makes sure the provided identifier satisfies semver spec
func validateIdentifier(id string) error {
if id != "" && !reIdentifier.MatchString(id) {
return fmt.Errorf("%s is not a valid semver identifier", id)
}
return nil
}
// reIdentifier is a regular expression used to check that pre-release and metadata
// identifiers satisfy the spec requirements
var reIdentifier = regexp.MustCompile(`^[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*$`)
internal/semver/semver_test.go
+110
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@@ -0,0 +1,110 @@
// Copyright 2013-2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// vendored from: https://github.com/coreos/go-semver/tree/e214231b295a8ea9479f11b70b35d5acf3556d9b/semver
package semver
import (
"testing"
)
type fixture struct {
GreaterVersion string
LesserVersion string
}
var fixtures = []fixture{
{"0.0.0", "0.0.0-foo"},
{"0.0.1", "0.0.0"},
{"1.0.0", "0.9.9"},
{"0.10.0", "0.9.0"},
{"0.99.0", "0.10.0"},
{"2.0.0", "1.2.3"},
{"0.0.0", "0.0.0-foo"},
{"0.0.1", "0.0.0"},
{"1.0.0", "0.9.9"},
{"0.10.0", "0.9.0"},
{"0.99.0", "0.10.0"},
{"2.0.0", "1.2.3"},
{"0.0.0", "0.0.0-foo"},
{"0.0.1", "0.0.0"},
{"1.0.0", "0.9.9"},
{"0.10.0", "0.9.0"},
{"0.99.0", "0.10.0"},
{"2.0.0", "1.2.3"},
{"1.2.3", "1.2.3-asdf"},
{"1.2.3", "1.2.3-4"},
{"1.2.3", "1.2.3-4-foo"},
{"1.2.3-5-foo", "1.2.3-5"},
{"1.2.3-5", "1.2.3-4"},
{"1.2.3-5-foo", "1.2.3-5-Foo"},
{"3.0.0", "2.7.2+asdf"},
{"3.0.0+foobar", "2.7.2"},
{"1.2.3-a.10", "1.2.3-a.5"},
{"1.2.3-a.b", "1.2.3-a.5"},
{"1.2.3-a.b", "1.2.3-a"},
{"1.2.3-a.b.c.10.d.5", "1.2.3-a.b.c.5.d.100"},
{"1.0.0", "1.0.0-rc.1"},
{"1.0.0-rc.2", "1.0.0-rc.1"},
{"1.0.0-rc.1", "1.0.0-beta.11"},
{"1.0.0-beta.11", "1.0.0-beta.2"},
{"1.0.0-beta.2", "1.0.0-beta"},
{"1.0.0-beta", "1.0.0-alpha.beta"},
{"1.0.0-alpha.beta", "1.0.0-alpha.1"},
{"1.0.0-alpha.1", "1.0.0-alpha"},
{"1.2.3-rc.1-1-1hash", "1.2.3-rc.2"},
}
func TestCompare(t *testing.T) {
for _, v := range fixtures {
gt, err := NewVersion(v.GreaterVersion)
if err != nil {
t.Error(err)
}
lt, err := NewVersion(v.LesserVersion)
if err != nil {
t.Error(err)
}
if gt.Compare(*lt) <= 0 {
t.Errorf("%s should be greater than %s", gt, lt)
}
if lt.Compare(*gt) > 0 {
t.Errorf("%s should not be greater than %s", lt, gt)
}
}
}
type fixtureJSON struct {
GreaterVersion *Version
LesserVersion *Version
}
func TestBadInput(t *testing.T) {
bad := []string{
"1.2",
"1.2.3x",
"0x1.3.4",
"-1.2.3",
"1.2.3.4",
"0.88.0-11_e4e5dcabb",
"0.88.0+11_e4e5dcabb",
}
for _, b := range bad {
if _, err := NewVersion(b); err == nil {
t.Error("Improperly accepted value: ", b)
}
}
}
topdown/semver.go
+60
View File
@@ -0,0 +1,60 @@
// Copyright 2020 The OPA Authors. All rights reserved.
// Use of this source code is governed by an Apache2
// license that can be found in the LICENSE file.
package topdown
import (
"fmt"
"github.com/open-policy-agent/opa/ast"
"github.com/open-policy-agent/opa/internal/semver"
"github.com/open-policy-agent/opa/topdown/builtins"
)
func builtinSemVerCompare(bctx BuiltinContext, args []*ast.Term, iter func(*ast.Term) error) error {
versionStringA, err := builtins.StringOperand(args[0].Value, 1)
if err != nil {
return err
}
versionStringB, err := builtins.StringOperand(args[1].Value, 2)
if err != nil {
return err
}
versionA, err := semver.NewVersion(string(versionStringA))
if err != nil {
return fmt.Errorf("operand 1: string %s is not a valid SemVer", versionStringA)
}
versionB, err := semver.NewVersion(string(versionStringB))
if err != nil {
return fmt.Errorf("operand 2: string %s is not a valid SemVer", versionStringB)
}
result := versionA.Compare(*versionB)
return iter(ast.IntNumberTerm(result))
}
func builtinSemVerIsValid(bctx BuiltinContext, args []*ast.Term, iter func(*ast.Term) error) error {
versionString, err := builtins.StringOperand(args[0].Value, 1)
if err != nil {
result := ast.BooleanTerm(false)
return iter(result)
}
result := true
_, err = semver.NewVersion(string(versionString))
if err != nil {
result = false
}
return iter(ast.BooleanTerm(result))
}
func init() {
RegisterBuiltinFunc(ast.SemVerCompare.Name, builtinSemVerCompare)
RegisterBuiltinFunc(ast.SemVerIsValid.Name, builtinSemVerIsValid)
}
topdown/semver_test.go
+67
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@@ -0,0 +1,67 @@
// Copyright 2020 The OPA Authors. All rights reserved.
// Use of this source code is governed by an Apache2
// license that can be found in the LICENSE file.
package topdown
import (
"testing"
"github.com/open-policy-agent/opa/ast"
)
func TestSemVerCompare(t *testing.T) {
tests := []struct {
note string
rules []string
expected interface{}
}{
{"a < b", []string{`p = x { x = semver.compare("1.0.0", "2.0.0") }`}, "-1"},
{"a > b", []string{`p = x { x = semver.compare("2.0.0", "1.0.0") }`}, "1"},
{"a == b", []string{`p = x { x = semver.compare("1.0.0", "1.0.0") }`}, "0"},
{
"invalid type a",
[]string{`p = x { x = semver.compare(1, "1.0.0") }`},
ast.Errors{ast.NewError(ast.TypeErr, nil, "semver.compare: invalid argument(s)")},
},
{
"invalid type b",
[]string{`p = x { x = semver.compare("1.0.0", false) }`},
ast.Errors{ast.NewError(ast.TypeErr, nil, "semver.compare: invalid argument(s)")},
},
{
"invalid version a",
[]string{`p = x { x = semver.compare("1", "1.0.0") }`},
&Error{Code: BuiltinErr, Message: `semver.compare("1", "1.0.0"): eval_builtin_error: semver.compare: operand 1: string "1" is not a valid SemVer`},
},
{
"invalid version b",
[]string{`p = x { x = semver.compare("1.0.0", "1") }`},
&Error{Code: BuiltinErr, Message: `semver.compare("1.0.0", "1"): eval_builtin_error: semver.compare: operand 2: string "1" is not a valid SemVer`},
},
}
data := map[string]interface{}{}
for _, tc := range tests {
runTopDownTestCase(t, data, tc.note, tc.rules, tc.expected)
}
}
func TestSemVerIsValid(t *testing.T) {
tests := []struct {
note string
rules []string
expected interface{}
}{
{"valid", []string{`p = x { x = semver.is_valid("1.0.0") }`}, "true"},
{"invalid version", []string{`p = x { x = semver.is_valid("1") }`}, "false"},
{"invalid type", []string{`p = x { x = semver.is_valid(1) }`}, "false"},
}
data := map[string]interface{}{}
for _, tc := range tests {
runTopDownTestCase(t, data, tc.note, tc.rules, tc.expected)
}
}