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encoding.go
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encoding.go
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// Copyright 2017 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 (
"bytes"
"encoding/base64"
"encoding/hex"
"encoding/json"
"fmt"
"net/url"
"strings"
ghodss "github.com/ghodss/yaml"
"github.com/open-policy-agent/opa/ast"
"github.com/open-policy-agent/opa/topdown/builtins"
"github.com/open-policy-agent/opa/util"
)
func builtinJSONMarshal(a ast.Value) (ast.Value, error) {
asJSON, err := ast.JSON(a)
if err != nil {
return nil, err
}
bs, err := json.Marshal(asJSON)
if err != nil {
return nil, err
}
return ast.String(string(bs)), nil
}
func builtinJSONUnmarshal(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
var x interface{}
if err := util.UnmarshalJSON([]byte(str), &x); err != nil {
return nil, err
}
return ast.InterfaceToValue(x)
}
func builtinJSONIsValid(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return ast.Boolean(false), nil
}
return ast.Boolean(json.Valid([]byte(str))), nil
}
func builtinBase64Encode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
return ast.String(base64.StdEncoding.EncodeToString([]byte(str))), nil
}
func builtinBase64Decode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
result, err := base64.StdEncoding.DecodeString(string(str))
return ast.String(result), err
}
func builtinBase64IsValid(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return ast.Boolean(false), nil
}
_, err = base64.StdEncoding.DecodeString(string(str))
return ast.Boolean(err == nil), nil
}
func builtinBase64UrlEncode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
return ast.String(base64.URLEncoding.EncodeToString([]byte(str))), nil
}
func builtinBase64UrlEncodeNoPad(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
return ast.String(base64.RawURLEncoding.EncodeToString([]byte(str))), nil
}
func builtinBase64UrlDecode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
s := string(str)
// Some base64url encoders omit the padding at the end, so this case
// corrects such representations using the method given in RFC 7515
// Appendix C: https://tools.ietf.org/html/rfc7515#appendix-C
if !strings.HasSuffix(s, "=") {
switch len(s) % 4 {
case 0:
case 2:
s += "=="
case 3:
s += "="
default:
return nil, fmt.Errorf("illegal base64url string: %s", s)
}
}
result, err := base64.URLEncoding.DecodeString(s)
return ast.String(result), err
}
func builtinURLQueryEncode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
return ast.String(url.QueryEscape(string(str))), nil
}
func builtinURLQueryDecode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
s, err := url.QueryUnescape(string(str))
if err != nil {
return nil, err
}
return ast.String(s), nil
}
var encodeObjectErr = builtins.NewOperandErr(1, "values must be string, array[string], or set[string]")
func builtinURLQueryEncodeObject(a ast.Value) (ast.Value, error) {
asJSON, err := ast.JSON(a)
if err != nil {
return nil, err
}
inputs, ok := asJSON.(map[string]interface{})
if !ok {
return nil, builtins.NewOperandTypeErr(1, a, "object")
}
query := url.Values{}
for k, v := range inputs {
switch vv := v.(type) {
case string:
query.Set(k, vv)
case []interface{}:
for _, val := range vv {
strVal, ok := val.(string)
if !ok {
return nil, encodeObjectErr
}
query.Add(k, strVal)
}
default:
return nil, encodeObjectErr
}
}
return ast.String(query.Encode()), nil
}
func builtinURLQueryDecodeObject(bctx BuiltinContext, operands []*ast.Term, iter func(*ast.Term) error) error {
query, err := builtins.StringOperand(operands[0].Value, 1)
if err != nil {
return err
}
queryParams, err := url.ParseQuery(string(query))
if err != nil {
return err
}
queryObject := ast.NewObject()
for k, v := range queryParams {
paramsArray := make([]*ast.Term, len(v))
for i, param := range v {
paramsArray[i] = ast.StringTerm(param)
}
queryObject.Insert(ast.StringTerm(k), ast.ArrayTerm(paramsArray...))
}
return iter(ast.NewTerm(queryObject))
}
func builtinYAMLMarshal(a ast.Value) (ast.Value, error) {
asJSON, err := ast.JSON(a)
if err != nil {
return nil, err
}
var buf bytes.Buffer
encoder := json.NewEncoder(&buf)
if err := encoder.Encode(asJSON); err != nil {
return nil, err
}
bs, err := ghodss.JSONToYAML(buf.Bytes())
if err != nil {
return nil, err
}
return ast.String(string(bs)), nil
}
func builtinYAMLUnmarshal(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
bs, err := ghodss.YAMLToJSON([]byte(str))
if err != nil {
return nil, err
}
buf := bytes.NewBuffer(bs)
decoder := util.NewJSONDecoder(buf)
var val interface{}
err = decoder.Decode(&val)
if err != nil {
return nil, err
}
return ast.InterfaceToValue(val)
}
func builtinYAMLIsValid(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return ast.Boolean(false), nil
}
var x interface{}
err = ghodss.Unmarshal([]byte(str), &x)
return ast.Boolean(err == nil), nil
}
func builtinHexEncode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
return ast.String(hex.EncodeToString([]byte(str))), nil
}
func builtinHexDecode(a ast.Value) (ast.Value, error) {
str, err := builtins.StringOperand(a, 1)
if err != nil {
return nil, err
}
val, err := hex.DecodeString(string(str))
if err != nil {
return nil, err
}
return ast.String(val), nil
}
func init() {
RegisterFunctionalBuiltin1(ast.JSONMarshal.Name, builtinJSONMarshal)
RegisterFunctionalBuiltin1(ast.JSONUnmarshal.Name, builtinJSONUnmarshal)
RegisterFunctionalBuiltin1(ast.JSONIsValid.Name, builtinJSONIsValid)
RegisterFunctionalBuiltin1(ast.Base64Encode.Name, builtinBase64Encode)
RegisterFunctionalBuiltin1(ast.Base64Decode.Name, builtinBase64Decode)
RegisterFunctionalBuiltin1(ast.Base64IsValid.Name, builtinBase64IsValid)
RegisterFunctionalBuiltin1(ast.Base64UrlEncode.Name, builtinBase64UrlEncode)
RegisterFunctionalBuiltin1(ast.Base64UrlEncodeNoPad.Name, builtinBase64UrlEncodeNoPad)
RegisterFunctionalBuiltin1(ast.Base64UrlDecode.Name, builtinBase64UrlDecode)
RegisterFunctionalBuiltin1(ast.URLQueryDecode.Name, builtinURLQueryDecode)
RegisterFunctionalBuiltin1(ast.URLQueryEncode.Name, builtinURLQueryEncode)
RegisterFunctionalBuiltin1(ast.URLQueryEncodeObject.Name, builtinURLQueryEncodeObject)
RegisterBuiltinFunc(ast.URLQueryDecodeObject.Name, builtinURLQueryDecodeObject)
RegisterFunctionalBuiltin1(ast.YAMLMarshal.Name, builtinYAMLMarshal)
RegisterFunctionalBuiltin1(ast.YAMLUnmarshal.Name, builtinYAMLUnmarshal)
RegisterFunctionalBuiltin1(ast.YAMLIsValid.Name, builtinYAMLIsValid)
RegisterFunctionalBuiltin1(ast.HexEncode.Name, builtinHexEncode)
RegisterFunctionalBuiltin1(ast.HexDecode.Name, builtinHexDecode)
}