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value.go
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value.go
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// Copyright 2016-2022, Pulumi Corporation.
//
// 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 config
import (
"context"
"encoding/json"
"fmt"
"strings"
"github.com/pkg/errors"
"github.com/pulumi/pulumi/sdk/v3/go/common/util/contract"
)
// Value is a single config value.
type Value struct {
value string
secure bool
object bool
}
func NewSecureValue(v string) Value {
return Value{value: v, secure: true}
}
func NewValue(v string) Value {
return Value{value: v, secure: false}
}
func NewSecureObjectValue(v string) Value {
return Value{value: v, secure: true, object: true}
}
func NewObjectValue(v string) Value {
return Value{value: v, secure: false, object: true}
}
// Value fetches the value of this configuration entry, using decrypter to decrypt if necessary. If the value
// is a secret and decrypter is nil, or if decryption fails for any reason, a non-nil error is returned.
func (c Value) Value(decrypter Decrypter) (string, error) {
if !c.secure {
return c.value, nil
}
if decrypter == nil {
return "", errors.New("non-nil decrypter required for secret")
}
if c.object && decrypter != NopDecrypter {
obj, err := c.unmarshalObjectJSON()
if err != nil {
return "", err
}
decryptedObj, err := decryptObject(obj, decrypter)
if err != nil {
return "", err
}
json, err := json.Marshal(decryptedObj)
if err != nil {
return "", err
}
return string(json), nil
}
return decrypter.DecryptValue(context.TODO(), c.value)
}
func (c Value) Copy(decrypter Decrypter, encrypter Encrypter) (Value, error) {
var val Value
raw, err := c.Value(decrypter)
if err != nil {
return Value{}, err
}
if c.Secure() {
if c.Object() {
objVal, err := c.ToObject()
if err != nil {
return Value{}, err
}
encryptedObj, err := reencryptObject(objVal, decrypter, encrypter)
if err != nil {
return Value{}, err
}
json, err := json.Marshal(encryptedObj)
if err != nil {
return Value{}, err
}
val = NewSecureObjectValue(string(json))
} else {
enc, eerr := encrypter.EncryptValue(context.TODO(), raw)
if eerr != nil {
return Value{}, eerr
}
val = NewSecureValue(enc)
}
} else {
if c.Object() {
val = NewObjectValue(raw)
} else {
val = NewValue(raw)
}
}
return val, nil
}
func (c Value) SecureValues(decrypter Decrypter) ([]string, error) {
d := NewTrackingDecrypter(decrypter)
if _, err := c.Value(d); err != nil {
return nil, err
}
return d.SecureValues(), nil
}
func (c Value) Secure() bool {
return c.secure
}
func (c Value) Object() bool {
return c.object
}
// ToObject returns the string value (if not an object), or the unmarshalled JSON object (if an object).
func (c Value) ToObject() (interface{}, error) {
if !c.object {
return c.value, nil
}
return c.unmarshalObjectJSON()
}
func (c Value) MarshalJSON() ([]byte, error) {
v, err := c.marshalValue()
if err != nil {
return nil, err
}
return json.Marshal(v)
}
func (c *Value) UnmarshalJSON(b []byte) error {
return c.unmarshalValue(
func(v interface{}) error {
return json.Unmarshal(b, v)
},
func(v interface{}) interface{} {
return v
})
}
func (c Value) MarshalYAML() (interface{}, error) {
return c.marshalValue()
}
func (c *Value) UnmarshalYAML(unmarshal func(interface{}) error) error {
return c.unmarshalValue(func(v interface{}) error {
return unmarshal(v)
}, interfaceMapToStringMap)
}
func (c *Value) unmarshalValue(unmarshal func(interface{}) error, fix func(interface{}) interface{}) error {
// First, try to unmarshal as a string.
err := unmarshal(&c.value)
if err == nil {
c.secure = false
c.object = false
return nil
}
// Otherwise, try to unmarshal as an object.
var obj interface{}
if err = unmarshal(&obj); err != nil {
return errors.Wrapf(err, "malformed config value")
}
// Fix-up the object (e.g. convert `map[interface{}]interface{}` to `map[string]interface{}`).
obj = fix(obj)
if is, val := isSecureValue(obj); is {
c.value = val
c.secure = true
c.object = false
return nil
}
json, err := json.Marshal(obj)
if err != nil {
return errors.Wrapf(err, "marshalling obj")
}
c.value = string(json)
c.secure = hasSecureValue(obj)
c.object = true
return nil
}
func (c Value) marshalValue() (interface{}, error) {
if c.object {
return c.unmarshalObjectJSON()
}
if !c.secure {
return c.value, nil
}
m := make(map[string]string)
m["secure"] = c.value
return m, nil
}
// The unserialized value from YAML needs to be serializable as JSON, but YAML will unmarshal maps as
// `map[interface{}]interface{}` (because it supports bools as keys), which isn't supported by the JSON
// marshaller. To address, when unserializing YAML, we convert `map[interface{}]interface{}` to
// `map[string]interface{}`.
func interfaceMapToStringMap(v interface{}) interface{} {
switch t := v.(type) {
case map[interface{}]interface{}:
m := make(map[string]interface{})
for key, val := range t {
m[fmt.Sprintf("%v", key)] = interfaceMapToStringMap(val)
}
return m
case []interface{}:
a := make([]interface{}, len(t))
for i, val := range t {
a[i] = interfaceMapToStringMap(val)
}
return a
}
return v
}
// hasSecureValue returns true if the object contains a value that's a `map[string]string` of
// length one with a "secure" key.
func hasSecureValue(v interface{}) bool {
switch t := v.(type) {
case map[string]interface{}:
if is, _ := isSecureValue(t); is {
return true
}
for _, val := range t {
if hasSecureValue(val) {
return true
}
}
case []interface{}:
for _, val := range t {
if hasSecureValue(val) {
return true
}
}
}
return false
}
// isSecureValue returns true if the object is a `map[string]string` of length one with a "secure" key.
func isSecureValue(v interface{}) (bool, string) {
if m, isMap := v.(map[string]interface{}); isMap && len(m) == 1 {
if val, hasSecureKey := m["secure"]; hasSecureKey {
if valString, isString := val.(string); isString {
return true, valString
}
}
}
return false, ""
}
func reencryptObject(v interface{}, decrypter Decrypter, encrypter Encrypter) (interface{}, error) {
reencryptIt := func(val interface{}) (interface{}, error) {
if isSecure, secureVal := isSecureValue(val); isSecure {
newVal := NewSecureValue(secureVal)
raw, err := newVal.Value(decrypter)
if err != nil {
return nil, err
}
encVal, err := encrypter.EncryptValue(context.TODO(), raw)
if err != nil {
return nil, err
}
m := make(map[string]string)
m["secure"] = encVal
return m, nil
}
return reencryptObject(val, decrypter, encrypter)
}
switch t := v.(type) {
case map[string]interface{}:
m := make(map[string]interface{})
for key, val := range t {
encrypted, err := reencryptIt(val)
if err != nil {
return nil, err
}
m[key] = encrypted
}
return m, nil
case []interface{}:
a := make([]interface{}, len(t))
for i, val := range t {
encrypted, err := reencryptIt(val)
if err != nil {
return nil, err
}
a[i] = encrypted
}
return a, nil
}
return v, nil
}
// decryptObject returns a new object with all secure values in the object converted to decrypted strings.
func decryptObject(v interface{}, decrypter Decrypter) (interface{}, error) {
decryptIt := func(val interface{}) (interface{}, error) {
if isSecure, secureVal := isSecureValue(val); isSecure {
return decrypter.DecryptValue(context.TODO(), secureVal)
}
return decryptObject(val, decrypter)
}
switch t := v.(type) {
case map[string]interface{}:
m := make(map[string]interface{})
for key, val := range t {
decrypted, err := decryptIt(val)
if err != nil {
return nil, err
}
m[key] = decrypted
}
return m, nil
case []interface{}:
a := make([]interface{}, len(t))
for i, val := range t {
decrypted, err := decryptIt(val)
if err != nil {
return nil, err
}
a[i] = decrypted
}
return a, nil
}
return v, nil
}
func (c Value) unmarshalObjectJSON() (interface{}, error) {
contract.Assertf(c.object, "expected value to be an object")
var v interface{}
dec := json.NewDecoder(strings.NewReader(c.value))
// By default, the JSON decoder will unmarshal numbers as float64, but we want to keep integers as integers
// if possible. We use the decoder's UseNumber option so that numbers are unmarshalled as json.Number, and
// then iterate through the object and try to convert any values of json.Number to an int64, otherwise falling
// back to float64.
dec.UseNumber()
err := dec.Decode(&v)
if err != nil {
return nil, err
}
v, err = replaceNumberWithIntOrFloat(v)
if err != nil {
return nil, err
}
return v, err
}
func replaceNumberWithIntOrFloat(v interface{}) (interface{}, error) {
switch t := v.(type) {
case map[string]interface{}:
for key, val := range t {
f, err := replaceNumberWithIntOrFloat(val)
if err != nil {
return nil, err
}
t[key] = f
}
case []interface{}:
for i, val := range t {
f, err := replaceNumberWithIntOrFloat(val)
if err != nil {
return nil, err
}
t[i] = f
}
case json.Number:
// Try to return the number as an int64, otherwise fall back to float64.
i, err := t.Int64()
if err == nil {
return i, nil
}
return t.Float64()
}
return v, nil
}