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// Copyright 2023 The age Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package plugin
import (
"fmt"
"strings"
"filippo.io/age/internal/bech32"
)
// EncodeIdentity encodes a plugin identity string for a plugin with the given
// name. If the name is invalid, it returns an empty string.
func EncodeIdentity(name string, data []byte) string {
if !validPluginName(name) {
return ""
}
s, _ := bech32.Encode("AGE-PLUGIN-"+strings.ToUpper(name)+"-", data)
return s
}
// ParseIdentity decodes a plugin identity string. It returns the plugin name
// in lowercase and the encoded data.
func ParseIdentity(s string) (name string, data []byte, err error) {
hrp, data, err := bech32.Decode(s)
if err != nil {
return "", nil, fmt.Errorf("invalid identity encoding: %v", err)
}
if !strings.HasPrefix(hrp, "AGE-PLUGIN-") || !strings.HasSuffix(hrp, "-") {
return "", nil, fmt.Errorf("not a plugin identity: %v", err)
}
name = strings.TrimSuffix(strings.TrimPrefix(hrp, "AGE-PLUGIN-"), "-")
name = strings.ToLower(name)
if !validPluginName(name) {
return "", nil, fmt.Errorf("invalid plugin name: %q", name)
}
return name, data, nil
}
// EncodeRecipient encodes a plugin recipient string for a plugin with the given
// name. If the name is invalid, it returns an empty string.
func EncodeRecipient(name string, data []byte) string {
if !validPluginName(name) {
return ""
}
s, _ := bech32.Encode("age1"+strings.ToLower(name), data)
return s
}
// ParseRecipient decodes a plugin recipient string. It returns the plugin name
// in lowercase and the encoded data.
func ParseRecipient(s string) (name string, data []byte, err error) {
hrp, data, err := bech32.Decode(s)
if err != nil {
return "", nil, fmt.Errorf("invalid recipient encoding: %v", err)
}
if !strings.HasPrefix(hrp, "age1") {
return "", nil, fmt.Errorf("not a plugin recipient: %v", err)
}
name = strings.TrimPrefix(hrp, "age1")
if !validPluginName(name) {
return "", nil, fmt.Errorf("invalid plugin name: %q", name)
}
return name, data, nil
}
func validPluginName(name string) bool {
if name == "" {
return false
}
allowed := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+-._"
for _, r := range name {
if !strings.ContainsRune(allowed, r) {
return false
}
}
return true
}
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