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oauthCredentialsCache.go
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oauthCredentialsCache.go
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// Copyright © 2018 Camunda Services GmbH (info@camunda.com)
//
// 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 zbc
import (
"fmt"
"github.com/mitchellh/go-homedir"
"golang.org/x/oauth2"
"gopkg.in/yaml.v2"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"sync"
)
const OAuthCachePathEnvVar = "ZEEBE_CLIENT_CONFIG_PATH"
const DefaultOAuthCacheFileDir = ".camunda"
const DefaultOAuthCacheFile = "credentials"
const oauthYamlCredentialsCachePerm = 0660
const ErrOAuthCredentialsCacheFolderIsNotDir = Error("OAuth credentials cache folder is not a directory, cannot create cache file under it")
const ErrOAuthCredentialsCacheIsDir = Error("OAuth credentials cache must be a file, not a directory")
var DefaultOauthYamlCachePath = getDefaultOAuthYamlCredentialsCachePath()
// OAuthCredentialsCache is used to cache results of fetching OAuth credentials
type OAuthCredentialsCache interface {
// Refresh should clear and re-populate the cache from defaults
Refresh() error
// Get should return the cached credentials for the given audience, or nil
Get(audience string) *oauth2.Token
// Update should set the credentials as the cached credentials for the given audience
Update(audience string, token *oauth2.Token) error
}
type oauthYamlCredentialsCache struct {
path string
audiences map[string]*oauthCachedCredentials
lock sync.RWMutex
}
type oauthCachedCredentials struct {
Auth struct{ Credentials *oauth2.Token }
}
func NewOAuthYamlCredentialsCache(path string) (OAuthCredentialsCache, error) {
var err error
envCachePath := env.get(OAuthCachePathEnvVar)
if envCachePath != "" {
path = envCachePath
} else if path == "" {
path = DefaultOauthYamlCachePath
}
if err = ensureOAuthCacheFileExists(path); err != nil {
return nil, err
}
cache := oauthYamlCredentialsCache{
path: path,
audiences: make(map[string]*oauthCachedCredentials),
}
if err := cache.readCache(); err != nil {
return nil, err
}
return &cache, nil
}
// Refresh overwrites the current in-memory contents with whatever is written in the cache file
func (cache *oauthYamlCredentialsCache) Refresh() error {
return cache.readCache()
}
// Get returns the cached credentials for the given audience or nil
// Note: it does not read the cache again
func (cache *oauthYamlCredentialsCache) Get(audience string) *oauth2.Token {
cache.lock.RLock()
defer cache.lock.RUnlock()
cachedCredentials := cache.audiences[audience]
if cachedCredentials == nil {
return nil
}
return cachedCredentials.Auth.Credentials
}
// Update updates the in-memory mapping for the given audience and credentials, and flushes its contents to disk
func (cache *oauthYamlCredentialsCache) Update(audience string, credentials *oauth2.Token) error {
cache.put(audience, credentials)
return cache.writeCache()
}
func (cache *oauthYamlCredentialsCache) put(audience string, credentials *oauth2.Token) {
cache.lock.Lock()
defer cache.lock.Unlock()
cache.audiences[audience] = &oauthCachedCredentials{
Auth: struct{ Credentials *oauth2.Token }{Credentials: credentials},
}
}
// readCache will overwrite the current contents of cache.audiences, so use carefully
func (cache *oauthYamlCredentialsCache) readCache() error {
cacheContents, err := ioutil.ReadFile(cache.path)
if err != nil {
return err
}
cache.lock.Lock()
defer cache.lock.Unlock()
err = yaml.Unmarshal(cacheContents, &cache.audiences)
return err
}
// writeCache will overwrite any contents in the current cache file, so use carefully
func (cache *oauthYamlCredentialsCache) writeCache() error {
cache.lock.RLock()
defer cache.lock.RUnlock()
cacheContents, err := yaml.Marshal(&cache.audiences)
if err != nil {
return err
}
return ioutil.WriteFile(cache.path, cacheContents, 0600)
}
func getDefaultOAuthYamlCredentialsCacheRelativePath() string {
return path.Join(DefaultOAuthCacheFileDir, DefaultOAuthCacheFile)
}
func getDefaultOAuthYamlCredentialsCachePath() string {
homeDir, err := homedir.Dir()
if err == nil {
homeDir, err = homedir.Expand(homeDir)
}
if err != nil {
log.Printf("Failed to read default home directory: %s", err.Error())
}
return path.Join(homeDir, getDefaultOAuthYamlCredentialsCacheRelativePath())
}
// ensures the cache file exists by creating it if need be, and fails if it already exists and is a directory
func ensureOAuthCacheFileExists(path string) (err error) {
info, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
if err = ensureOAuthCachePathSegmentsExist(filepath.Dir(path)); err != nil {
return err
}
if file, creationError := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, oauthYamlCredentialsCachePerm); creationError == nil {
err = file.Close()
} else {
err = creationError
}
}
} else if info.IsDir() {
err = fmt.Errorf("%s: %w", path, ErrOAuthCredentialsCacheIsDir)
}
return
}
func ensureOAuthCachePathSegmentsExist(directory string) error {
dirInfo, err := os.Stat(directory)
if err != nil {
if !os.IsNotExist(err) {
return err
}
if err = os.MkdirAll(directory, 0770); err != nil {
return err
}
} else if !dirInfo.IsDir() {
return fmt.Errorf("%s: %w", directory, ErrOAuthCredentialsCacheFolderIsNotDir)
}
return err
}