mirror of https://github.com/dapr/kit.git
94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
/*
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Copyright 2023 The Dapr Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package v1
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import (
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"errors"
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"fmt"
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"strconv"
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)
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// Cipher used to encrypt the file.
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type Cipher string
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const (
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CipherAESGCM Cipher = "AES-GCM"
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CipherChaCha20Poly1305 Cipher = "CHACHA20-POLY1305"
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cipherInvalid = 0
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cipherNumAESGCM = 1
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cipherNumChaCha20Poly1305 = 2
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)
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// Validate the passed cipher and resolves aliases.
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func (c Cipher) Validate() (Cipher, error) {
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switch c {
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// Valid ciphers, not aliased
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case CipherAESGCM, CipherChaCha20Poly1305:
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return c, nil
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default:
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return c, fmt.Errorf("cipher %s is not supported", c)
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}
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}
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// ID returns the numeric ID for the cipher.
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func (c Cipher) ID() int {
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switch c {
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case CipherAESGCM:
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return cipherNumAESGCM
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case CipherChaCha20Poly1305:
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return cipherNumChaCha20Poly1305
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default:
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return cipherInvalid
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}
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}
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// NewCipherFromID returns a Cipher from its ID.
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func NewCipherFromID(id int) (Cipher, error) {
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switch id {
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case cipherNumAESGCM:
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return CipherAESGCM, nil
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case cipherNumChaCha20Poly1305:
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return CipherChaCha20Poly1305, nil
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default:
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return "", fmt.Errorf("cipher ID %d is not supported", id)
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}
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}
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// MarhsalJSON implements json.Marshaler.
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func (c Cipher) MarshalJSON() ([]byte, error) {
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return []byte(strconv.Itoa(c.ID())), nil
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (c *Cipher) UnmarshalJSON(dataB []byte) error {
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data := string(dataB)
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if data == "" || data == "null" {
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return errors.New("value is empty")
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}
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id, err := strconv.Atoi(data)
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if err != nil {
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return errors.New("failed to parse value as number")
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}
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newC, err := NewCipherFromID(id)
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if err != nil {
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return err
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}
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*c = newC
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return nil
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}
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