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processor.go
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processor.go
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// Copyright © 2023 Cisco
//
// 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 storesync
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"fmt"
"strings"
"sync"
"text/template"
"github.com/iancoleman/strcase"
"golang.org/x/sync/errgroup"
"github.com/bank-vaults/secret-sync/pkg/apis/v1alpha1"
)
type fetchResponse struct {
// Always set
Data []byte
// Only 1 is non-nil
FromRef *v1alpha1.SecretRef
FromQuery *v1alpha1.SecretQuery
FromSource *v1alpha1.SecretSource
}
type syncRequest struct {
RequestID int
ActionRef *v1alpha1.SyncAction
Data []byte
}
// processor is used to optimally fetch secrets from a source to internal fetched map.
type processor struct {
mu sync.RWMutex
source v1alpha1.StoreReader
fetched map[v1alpha1.SecretRef][]byte
}
func newProcessor(source v1alpha1.StoreReader) *processor {
return &processor{
mu: sync.RWMutex{},
source: source,
fetched: map[v1alpha1.SecretRef][]byte{},
}
}
// GetSyncRequests fetches the data from source and applies templating based on the provided v1alpha1.SyncAction.
// Returned map defines all secrets that need to be sent to the target store to complete the request.
func (p *processor) GetSyncRequests(ctx context.Context, reqID int, req v1alpha1.SyncAction) (map[v1alpha1.SecretRef]syncRequest, error) {
switch {
// FromRef can only sync a single secret
case req.FromRef != nil:
resp, err := p.FetchFromRef(ctx, *req.FromRef)
if err != nil {
return nil, err
}
syncRef := *req.FromRef
if req.Target.Key != nil {
syncRef.Key = *req.Target.Key
}
syncValue := resp.Data
if !isTemplateEmpty(req.Template) {
syncValue, err = getTemplatedValue(req.Template, string(resp.Data))
if err != nil {
return nil, err
}
}
return map[v1alpha1.SecretRef]syncRequest{
syncRef: {
Data: syncValue,
ActionRef: &req,
RequestID: reqID,
},
}, nil
// FromQuery can sync both a single secret or multiple secrets
case req.FromQuery != nil:
fetchResps, err := p.FetchFromQuery(ctx, *req.FromQuery)
if err != nil {
return nil, err
}
// Handle FromQuery => Key
if req.Target.Key != nil {
if req.Flatten == nil || !*req.Flatten {
return nil, fmt.Errorf("requires 'flatten' for 'fromQuery' and 'target.key'")
}
syncRef := v1alpha1.SecretRef{
Key: *req.Target.Key,
Version: nil,
}
templateData := make(map[string]string)
for ref, resp := range fetchResps {
keyName := strcase.ToLowerCamel(ref.GetName())
templateData[keyName] = string(resp.Data)
}
if isTemplateEmpty(req.Template) {
return nil, fmt.Errorf("requires 'template' for 'fromQuery' and 'target.key'")
}
syncValue, err := getTemplatedValue(req.Template, templateData)
if err != nil {
return nil, err
}
return map[v1alpha1.SecretRef]syncRequest{
syncRef: {
Data: syncValue,
ActionRef: &req,
RequestID: reqID,
},
}, nil
}
// Handle FromQuery => KeyPrefix or empty
if req.Flatten != nil && *req.Flatten {
return nil, fmt.Errorf("cannot use 'flatten' for 'fromQuery' and 'target.key'")
}
syncMap := make(map[v1alpha1.SecretRef]syncRequest)
for ref, resp := range fetchResps {
syncRef := ref
if req.Target.KeyPrefix != nil {
syncRef.Key = *req.Target.KeyPrefix + ref.GetName()
}
syncValue := resp.Data
if !isTemplateEmpty(req.Template) {
syncValue, err = getTemplatedValue(req.Template, string(resp.Data))
if err != nil {
return nil, err
}
}
syncMap[syncRef] = syncRequest{
Data: syncValue,
ActionRef: &req,
RequestID: reqID,
}
}
return syncMap, nil
// FromSources can only sync a single secret
case len(req.FromSources) > 0:
fetchResps, err := p.FetchFromSources(ctx, req.FromSources)
if err != nil {
return nil, err
}
if req.Target.Key == nil {
return nil, fmt.Errorf("requires 'target.key' for 'fromSources'")
}
syncRef := v1alpha1.SecretRef{
Key: *req.Target.Key,
Version: nil,
}
templateData := make(map[string]interface{})
for ref, resp := range fetchResps {
// For responses originating fromRef
source := resp.FromSource
sourceName := strcase.ToLowerCamel(source.Name)
if source.FromRef != nil {
// Ensures that .Data.<SOURCE NAME> fromRef is the secret value
templateData[sourceName] = string(resp.Data)
}
if source.FromQuery != nil {
// ensures that .Data.<SOURCE NAME>.<QUERY KEY> fromQuery is the secret value
if templateData[sourceName] == nil {
templateData[sourceName] = make(map[string]string)
}
keyName := strcase.ToLowerCamel(ref.GetName())
templateData[sourceName].(map[string]string)[keyName] = string(resp.Data)
}
}
if isTemplateEmpty(req.Template) {
return nil, fmt.Errorf("requires 'template' for 'fromSources'")
}
syncValue, err := getTemplatedValue(req.Template, templateData)
if err != nil {
return nil, err
}
return map[v1alpha1.SecretRef]syncRequest{
syncRef: {
Data: syncValue,
ActionRef: &req,
RequestID: reqID,
},
}, nil
}
return nil, fmt.Errorf("no sources specified")
}
// FetchFromRef fetches v1alpha1.SecretRef data from reference or from internal fetch store.
func (p *processor) FetchFromRef(ctx context.Context, fromRef v1alpha1.SecretRef) (*fetchResponse, error) {
// Get from fetch store
data, exists := p.getFetchedSecret(fromRef)
// Fetch and save if not found
if !exists {
var err error
data, err = p.source.GetSecret(ctx, fromRef)
if err != nil {
return nil, err
}
p.addFetchedSecret(fromRef, data)
}
// Return
return &fetchResponse{
Data: data,
FromRef: &fromRef,
}, nil
}
// FetchFromQuery fetches v1alpha1.SecretRef data from query or from internal fetch store.
func (p *processor) FetchFromQuery(ctx context.Context, fromQuery v1alpha1.SecretQuery) (map[v1alpha1.SecretRef]fetchResponse, error) {
// List secrets from source
keyRefs, err := p.source.ListSecretKeys(ctx, fromQuery)
if err != nil {
return nil, fmt.Errorf("failed while doing query %v: %w", fromQuery, err)
}
// Fetch queried keys in parallel
fetchMu := sync.Mutex{}
fetched := make(map[v1alpha1.SecretRef]fetchResponse)
fetchGroup, fetchCtx := errgroup.WithContext(ctx)
for _, ref := range keyRefs {
func(ref v1alpha1.SecretRef) {
fetchGroup.Go(func() error {
// Fetch
resp, err := p.FetchFromRef(fetchCtx, ref)
if err != nil {
return err
}
// Update
fetchMu.Lock()
fetched[ref] = fetchResponse{
Data: resp.Data,
FromQuery: &fromQuery,
}
fetchMu.Unlock()
return nil
})
}(ref)
}
// Return
if err = fetchGroup.Wait(); err != nil {
return nil, err
}
return fetched, nil
}
// FetchFromSources fetches v1alpha1.SecretRef data from selectors or from internal fetch store..
func (p *processor) FetchFromSources(ctx context.Context, fromSources []v1alpha1.SecretSource) (map[v1alpha1.SecretRef]fetchResponse, error) {
// Fetch source keys from source or fetch store in parallel
fetchMu := sync.Mutex{}
fetched := make(map[v1alpha1.SecretRef]fetchResponse)
fetchGroup, fetchCtx := errgroup.WithContext(ctx)
for _, src := range fromSources {
func(src v1alpha1.SecretSource) {
fetchGroup.Go(func() error {
// Fetch
kvData := make(map[v1alpha1.SecretRef][]byte)
switch {
case src.FromRef != nil:
resp, err := p.FetchFromRef(fetchCtx, *src.FromRef)
if err != nil {
return err
}
kvData[*src.FromRef] = resp.Data
case src.FromQuery != nil:
respMap, err := p.FetchFromQuery(fetchCtx, *src.FromQuery)
if err != nil {
return err
}
for ref, resp := range respMap {
kvData[ref] = resp.Data
}
default:
return fmt.Errorf("both ref and query are empty")
}
// Update
fetchMu.Lock()
for ref, value := range kvData {
fetched[ref] = fetchResponse{
Data: value,
FromSource: &src,
}
}
fetchMu.Unlock()
return nil
})
}(src)
}
// Return
if err := fetchGroup.Wait(); err != nil {
return nil, err
}
return fetched, nil
}
// getFetchedSecret returns a key value from local fetched source.
func (p *processor) getFetchedSecret(ref v1alpha1.SecretRef) ([]byte, bool) {
p.mu.RLock()
defer p.mu.RUnlock()
res, ok := p.fetched[ref]
return res, ok
}
// addFetchedSecret adds a key value to local fetched store.
func (p *processor) addFetchedSecret(ref v1alpha1.SecretRef, value []byte) {
p.mu.Lock()
defer p.mu.Unlock()
p.fetched[ref] = value
}
func getTemplatedValue(syncTemplate *v1alpha1.SyncTemplate, templateData interface{}) ([]byte, error) {
templater := template.New("template").Funcs(getTemplateFuncs())
// Handle Template.RawData
if syncTemplate.RawData != nil {
templater, err := templater.Parse(*syncTemplate.RawData)
if err != nil {
return nil, err
}
output := new(bytes.Buffer)
if err = templater.Execute(output, struct{ Data interface{} }{Data: templateData}); err != nil {
return nil, err
}
return output.Bytes(), nil
}
// Handle Template.Data
if len(syncTemplate.Data) > 0 {
outputMap := make(map[string]string)
for key, keyTpl := range syncTemplate.Data {
templater, err := templater.Parse(keyTpl)
if err != nil {
return nil, err
}
output := new(bytes.Buffer)
if err = templater.Execute(output, struct{ Data interface{} }{Data: templateData}); err != nil {
return nil, err
}
outputMap[key] = output.String()
}
return json.Marshal(outputMap)
}
return nil, fmt.Errorf("cannot apply empty template")
}
// isTemplateEmpty checks if template is defined.
// TODO: debug why syncTemplate is sometimes not nil when not specified
func isTemplateEmpty(syncTemplate *v1alpha1.SyncTemplate) bool {
if syncTemplate == nil {
return true
}
return syncTemplate.RawData == nil && len(syncTemplate.Data) == 0
}
func getTemplateFuncs() map[string]any {
return map[string]any{
"base64dec": func(encoded string) string {
decoded, _ := base64.StdEncoding.DecodeString(encoded)
return string(decoded)
},
"base64enc": func(decoded string) string {
encoded := base64.StdEncoding.EncodeToString([]byte(decoded))
return encoded
},
"contains": strings.Contains,
"hasPrefix": strings.HasPrefix,
"hasSuffix": strings.HasSuffix,
}
}