build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/github.com/google/cel-go/ext/encoders.go

@@ -0,0 +1,94 @@
+// 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/common/types"
+	"github.com/google/cel-go/common/types/ref"
+)
+
+// 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')   // return b'hello'
+//
+// # 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) LibraryName() string {
+	return "cel.lib.ext.encoders"
+}
+
+func (encoderLib) CompileOptions() []cel.EnvOption {
+	return []cel.EnvOption{
+		cel.Function("base64.decode",
+			cel.Overload("base64_decode_string", []*cel.Type{cel.StringType}, cel.BytesType,
+				cel.UnaryBinding(func(str ref.Val) ref.Val {
+					s := str.(types.String)
+					return bytesOrError(base64DecodeString(string(s)))
+				}))),
+		cel.Function("base64.encode",
+			cel.Overload("base64_encode_bytes", []*cel.Type{cel.BytesType}, cel.StringType,
+				cel.UnaryBinding(func(bytes ref.Val) ref.Val {
+					b := bytes.(types.Bytes)
+					return stringOrError(base64EncodeBytes([]byte(b)))
+				}))),
+	}
+}
+
+func (encoderLib) ProgramOptions() []cel.ProgramOption {
+	return []cel.ProgramOption{}
+}
+
+func base64DecodeString(str string) ([]byte, error) {
+	b, err := base64.StdEncoding.DecodeString(str)
+	if err == nil {
+		return b, nil
+	}
+	if _, tryAltEncoding := err.(base64.CorruptInputError); tryAltEncoding {
+		return base64.RawStdEncoding.DecodeString(str)
+	}
+	return nil, err
+}
+
+func base64EncodeBytes(bytes []byte) (string, error) {
+	return base64.StdEncoding.EncodeToString(bytes), nil
+}