// Copyright 2020 Google LLC

//

// 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.

package ext

import (

"encoding/base64"

"github.com/google/cel-go/cel"

"github.com/google/cel-go/checker/decls"

"github.com/google/cel-go/interpreter/functions"

exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"

)

// Encoders returns a cel.EnvOption to configure extended functions for string, byte, and object

// encodings.

//

// Base64.Decode

//

// Decodes base64-encoded string to bytes.

//

// This function will return an error if the string input is not base64-encoded.

//

// base64.decode(<string>) -> <bytes>

//

// Examples:

//

// base64.decode('aGVsbG8=') // return b'hello'

// base64.decode('aGVsbG8') // error

//

// Base64.Encode

//

// Encodes bytes to a base64-encoded string.

//

// base64.encode(<bytes>) -> <string>

//

// Examples:

//

// base64.encode(b'hello') // return b'aGVsbG8='

func Encoders() cel.EnvOption {

return cel.Lib(encoderLib{})

}

type encoderLib struct{}

func (encoderLib) CompileOptions() []cel.EnvOption {

}

func (encoderLib) ProgramOptions() []cel.ProgramOption {

}

func base64DecodeString(str string) ([]byte, error) {

return base64.StdEncoding.DecodeString(str)

}

func base64EncodeBytes(bytes []byte) (string, error) {

return base64.StdEncoding.EncodeToString(bytes), nil

}