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vault_write.go
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vault_write.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package dependency
import (
"crypto/sha1"
"fmt"
"io"
"log"
"net/url"
"sort"
"strings"
"time"
"github.com/hashicorp/vault/api"
"github.com/pkg/errors"
)
// Ensure implements
var _ Dependency = (*VaultWriteQuery)(nil)
// VaultWriteQuery is the dependency to Vault for a secret
type VaultWriteQuery struct {
stopCh chan struct{}
sleepCh chan time.Duration
path string
data map[string]interface{}
dataHash string
secret *Secret
// vaultSecret is the actual Vault secret which we are renewing
vaultSecret *api.Secret
}
// NewVaultWriteQuery creates a new datacenter dependency.
func NewVaultWriteQuery(s string, d map[string]interface{}) (*VaultWriteQuery, error) {
s = strings.TrimSpace(s)
s = strings.Trim(s, "/")
if s == "" {
return nil, fmt.Errorf("vault.write: invalid format: %q", s)
}
return &VaultWriteQuery{
stopCh: make(chan struct{}, 1),
sleepCh: make(chan time.Duration, 1),
path: s,
data: d,
dataHash: sha1Map(d),
}, nil
}
// Fetch queries the Vault API
func (d *VaultWriteQuery) Fetch(clients *ClientSet, opts *QueryOptions,
) (interface{}, *ResponseMetadata, error) {
select {
case <-d.stopCh:
return nil, nil, ErrStopped
default:
}
select {
case dur := <-d.sleepCh:
time.Sleep(dur)
default:
}
firstRun := d.secret == nil
if !firstRun && vaultSecretRenewable(d.secret) {
err := renewSecret(clients, d)
if err != nil {
return nil, nil, errors.Wrap(err, d.String())
}
}
opts = opts.Merge(&QueryOptions{})
vaultSecret, err := d.writeSecret(clients, opts)
if err != nil {
return nil, nil, errors.Wrap(err, d.String())
}
// vaultSecret == nil when writing to KVv1 engines
if vaultSecret == nil {
return respWithMetadata(d.secret)
}
printVaultWarnings(d, vaultSecret.Warnings)
d.vaultSecret = vaultSecret
// cloned secret which will be exposed to the template
d.secret = transformSecret(vaultSecret)
if !vaultSecretRenewable(d.secret) {
dur := leaseCheckWait(d.secret)
log.Printf("[TRACE] %s: non-renewable secret, set sleep for %s", d, dur)
d.sleepCh <- dur
}
return respWithMetadata(d.secret)
}
// meet renewer interface
func (d *VaultWriteQuery) stopChan() chan struct{} {
return d.stopCh
}
func (d *VaultWriteQuery) secrets() (*Secret, *api.Secret) {
return d.secret, d.vaultSecret
}
// CanShare returns if this dependency is shareable.
func (d *VaultWriteQuery) CanShare() bool {
return false
}
// Stop halts the given dependency's fetch.
func (d *VaultWriteQuery) Stop() {
close(d.stopCh)
}
// String returns the human-friendly version of this dependency.
func (d *VaultWriteQuery) String() string {
return fmt.Sprintf("vault.write(%s -> %s)", d.path, d.dataHash)
}
// Type returns the type of this dependency.
func (d *VaultWriteQuery) Type() Type {
return TypeVault
}
// sha1Map returns the sha1 hash of the data in the map. The reason this data is
// hashed is because it appears in the output and could contain sensitive
// information.
func sha1Map(m map[string]interface{}) string {
keys := make([]string, 0, len(m))
for k := range m {
keys = append(keys, k)
}
sort.Strings(keys)
h := sha1.New()
for _, k := range keys {
io.WriteString(h, fmt.Sprintf("%s=%q", k, m[k]))
}
return fmt.Sprintf("%.4x", h.Sum(nil))
}
func (d *VaultWriteQuery) writeSecret(clients *ClientSet, opts *QueryOptions) (*api.Secret, error) {
log.Printf("[TRACE] %s: PUT %s", d, &url.URL{
Path: "/v1/" + d.path,
RawQuery: opts.String(),
})
path := d.path
data := d.data
mountPath, isv2, _ := isKVv2(clients.Vault(), path)
if isv2 {
path = shimKVv2Path(path, mountPath)
data = map[string]interface{}{"data": d.data}
}
vaultSecret, err := clients.Vault().Logical().Write(path, data)
if err != nil {
return nil, errors.Wrap(err, d.String())
}
// vaultSecret is always nil when KVv1 engine (isv2==false)
if isv2 && vaultSecret == nil {
return nil, fmt.Errorf("no secret exists at %s", d.path)
}
return vaultSecret, nil
}