mirror of
https://github.com/kubernetes-sigs/descheduler.git
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113 lines
3.0 KiB
Go
Vendored
113 lines
3.0 KiB
Go
Vendored
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ext
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import (
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"encoding/base64"
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"math"
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"github.com/google/cel-go/cel"
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"github.com/google/cel-go/common/types"
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"github.com/google/cel-go/common/types/ref"
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)
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// Encoders returns a cel.EnvOption to configure extended functions for string, byte, and object
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// encodings.
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//
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// # Base64.Decode
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//
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// Decodes base64-encoded string to bytes.
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//
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// This function will return an error if the string input is not base64-encoded.
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//
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// base64.decode(<string>) -> <bytes>
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//
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// Examples:
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//
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// base64.decode('aGVsbG8=') // return b'hello'
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// base64.decode('aGVsbG8') // return b'hello'
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//
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// # Base64.Encode
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//
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// Encodes bytes to a base64-encoded string.
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//
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// base64.encode(<bytes>) -> <string>
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//
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// Examples:
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//
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// base64.encode(b'hello') // return b'aGVsbG8='
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func Encoders(options ...EncodersOption) cel.EnvOption {
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l := &encoderLib{version: math.MaxUint32}
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for _, o := range options {
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l = o(l)
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}
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return cel.Lib(l)
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}
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// EncodersOption declares a functional operator for configuring encoder extensions.
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type EncodersOption func(*encoderLib) *encoderLib
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// EncodersVersion sets the library version for encoder extensions.
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func EncodersVersion(version uint32) EncodersOption {
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return func(lib *encoderLib) *encoderLib {
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lib.version = version
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return lib
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}
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}
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type encoderLib struct {
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version uint32
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}
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func (*encoderLib) LibraryName() string {
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return "cel.lib.ext.encoders"
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}
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func (*encoderLib) CompileOptions() []cel.EnvOption {
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return []cel.EnvOption{
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cel.Function("base64.decode",
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cel.Overload("base64_decode_string", []*cel.Type{cel.StringType}, cel.BytesType,
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cel.UnaryBinding(func(str ref.Val) ref.Val {
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s := str.(types.String)
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return bytesOrError(base64DecodeString(string(s)))
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}))),
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cel.Function("base64.encode",
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cel.Overload("base64_encode_bytes", []*cel.Type{cel.BytesType}, cel.StringType,
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cel.UnaryBinding(func(bytes ref.Val) ref.Val {
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b := bytes.(types.Bytes)
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return stringOrError(base64EncodeBytes([]byte(b)))
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}))),
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}
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}
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func (*encoderLib) ProgramOptions() []cel.ProgramOption {
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return []cel.ProgramOption{}
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}
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func base64DecodeString(str string) ([]byte, error) {
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b, err := base64.StdEncoding.DecodeString(str)
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if err == nil {
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return b, nil
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}
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if _, tryAltEncoding := err.(base64.CorruptInputError); tryAltEncoding {
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return base64.RawStdEncoding.DecodeString(str)
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}
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return nil, err
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}
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func base64EncodeBytes(bytes []byte) (string, error) {
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return base64.StdEncoding.EncodeToString(bytes), nil
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}
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