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managerimpl.go
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managerimpl.go
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package config
import (
"fmt"
"net/http"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"sync"
"time"
"emperror.dev/errors"
"github.com/fsnotify/fsnotify"
"github.com/go-playground/validator/v10"
"github.com/oxyno-zeta/s3-proxy/pkg/s3-proxy/log"
"github.com/oxyno-zeta/s3-proxy/pkg/s3-proxy/utils/generalutils"
"github.com/spf13/viper"
"github.com/thoas/go-funk"
)
var validate = validator.New()
type managerimpl struct {
cfg *Config
configs []*viper.Viper
onChangeHooks []func()
logger log.Logger
internalFileWatchChannels []chan bool
}
func (impl *managerimpl) AddOnChangeHook(hook func()) {
impl.onChangeHooks = append(impl.onChangeHooks, hook)
}
func (impl *managerimpl) Load(mainConfDir string) error {
// List files
files, err := os.ReadDir(mainConfDir)
if err != nil {
return errors.WithStack(err)
}
// Generate viper instances for static configs
impl.configs = generateViperInstances(files, mainConfDir)
// Load configuration
err = impl.loadConfiguration()
if err != nil {
return err
}
// Loop over config files
funk.ForEach(impl.configs, func(vip *viper.Viper) {
// Add hooks for on change events
vip.OnConfigChange(func(_ fsnotify.Event) {
impl.logger.Infof("Reload configuration detected for file %s", vip.ConfigFileUsed())
// Reload config
err2 := impl.loadConfiguration()
if err2 != nil {
impl.logger.Error(err2)
// Stop here and do not call hooks => configuration is unstable
return
}
// Call all hooks
funk.ForEach(impl.onChangeHooks, func(hook func()) { hook() })
})
// Watch for configuration changes
vip.WatchConfig()
})
return nil
}
// Imported and modified from viper v1.7.0.
func (impl *managerimpl) watchInternalFile(filePath string, forceStop chan bool, onChange func()) {
initWG := sync.WaitGroup{}
initWG.Add(1)
go func() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
impl.logger.Fatal(errors.WithStack(err))
}
defer watcher.Close()
configFile := filepath.Clean(filePath)
configDir, _ := filepath.Split(configFile)
realConfigFile, _ := filepath.EvalSymlinks(filePath)
eventsWG := sync.WaitGroup{}
eventsWG.Add(1)
go func() {
for {
select {
case <-forceStop:
eventsWG.Done()
return
case event, ok := <-watcher.Events:
if !ok { // 'Events' channel is closed
eventsWG.Done()
return
}
currentConfigFile, _ := filepath.EvalSymlinks(filePath)
// we only care about the config file with the following cases:
// 1 - if the config file was modified or created
// 2 - if the real path to the config file changed (eg: k8s ConfigMap replacement)
const writeOrCreateMask = fsnotify.Write | fsnotify.Create
if (filepath.Clean(event.Name) == configFile &&
event.Op&writeOrCreateMask != 0) ||
(currentConfigFile != "" && currentConfigFile != realConfigFile) {
realConfigFile = currentConfigFile
// Call on change
onChange()
} else if filepath.Clean(event.Name) == configFile && event.Op&fsnotify.Remove&fsnotify.Remove != 0 {
eventsWG.Done()
return
}
case err, ok := <-watcher.Errors:
if ok { // 'Errors' channel is not closed
impl.logger.Errorf("watcher error: %v\n", err)
}
eventsWG.Done()
return
}
}
}()
_ = watcher.Add(configDir)
initWG.Done() // done initializing the watch in this go routine, so the parent routine can move on...
eventsWG.Wait() // now, wait for event loop to end in this go-routine...
}()
initWG.Wait() // make sure that the go routine above fully ended before returning
}
func (*managerimpl) loadDefaultConfigurationValues(vip *viper.Viper) {
// Load default configuration
vip.SetDefault("log.level", DefaultLogLevel)
vip.SetDefault("log.format", DefaultLogFormat)
vip.SetDefault("server.port", DefaultPort)
vip.SetDefault("server.compress.enabled", &DefaultServerCompressEnabled)
vip.SetDefault("server.compress.level", DefaultServerCompressLevel)
vip.SetDefault("server.compress.types", DefaultServerCompressTypes)
vip.SetDefault("server.timeouts.readHeaderTimeout", DefaultServerTimeoutsReadHeaderTimeout)
vip.SetDefault("internalServer.port", DefaultInternalPort)
vip.SetDefault("internalServer.compress.enabled", &DefaultServerCompressEnabled)
vip.SetDefault("internalServer.compress.level", DefaultServerCompressLevel)
vip.SetDefault("internalServer.compress.types", DefaultServerCompressTypes)
vip.SetDefault("internalServer.timeouts.readHeaderTimeout", DefaultServerTimeoutsReadHeaderTimeout)
vip.SetDefault("templates.helpers", []string{DefaultTemplateHelpersPath})
vip.SetDefault("templates.folderList.path", DefaultTemplateFolderListPath)
vip.SetDefault("templates.folderList.headers", DefaultTemplateHeaders)
vip.SetDefault("templates.folderList.status", DefaultTemplateStatusOk)
vip.SetDefault("templates.targetList.path", DefaultTemplateTargetListPath)
vip.SetDefault("templates.targetList.headers", DefaultTemplateHeaders)
vip.SetDefault("templates.targetList.status", DefaultTemplateStatusOk)
vip.SetDefault("templates.notFoundError.path", DefaultTemplateNotFoundErrorPath)
vip.SetDefault("templates.notFoundError.headers", DefaultTemplateHeaders)
vip.SetDefault("templates.notFoundError.status", DefaultTemplateStatusNotFound)
vip.SetDefault("templates.internalServerError.path", DefaultTemplateInternalServerErrorPath)
vip.SetDefault("templates.internalServerError.headers", DefaultTemplateHeaders)
vip.SetDefault("templates.internalServerError.status", DefaultTemplateStatusInternalServerError)
vip.SetDefault("templates.unauthorizedError.path", DefaultTemplateUnauthorizedErrorPath)
vip.SetDefault("templates.unauthorizedError.headers", DefaultTemplateHeaders)
vip.SetDefault("templates.unauthorizedError.status", DefaultTemplateStatusUnauthorized)
vip.SetDefault("templates.forbiddenError.path", DefaultTemplateForbiddenErrorPath)
vip.SetDefault("templates.forbiddenError.headers", DefaultTemplateHeaders)
vip.SetDefault("templates.forbiddenError.status", DefaultTemplateStatusForbidden)
vip.SetDefault("templates.badRequestError.path", DefaultTemplateBadRequestErrorPath)
vip.SetDefault("templates.badRequestError.headers", DefaultTemplateHeaders)
vip.SetDefault("templates.badRequestError.status", DefaultTemplateStatusBadRequest)
vip.SetDefault("templates.put.path", DefaultTemplatePutPath)
vip.SetDefault("templates.put.headers", DefaultEmptyTemplateHeaders)
vip.SetDefault("templates.put.status", DefaultTemplateStatusNoContent)
vip.SetDefault("templates.delete.path", DefaultTemplateDeletePath)
vip.SetDefault("templates.delete.headers", DefaultEmptyTemplateHeaders)
vip.SetDefault("templates.delete.status", DefaultTemplateStatusNoContent)
}
func generateViperInstances(files []os.DirEntry, mainConfDir string) []*viper.Viper {
list := make([]*viper.Viper, 0)
// Loop over static files to create viper instance for them
funk.ForEach(files, func(file os.DirEntry) {
filename := file.Name()
// Create config file name
cfgFileName := strings.TrimSuffix(filename, path.Ext(filename))
// Test if config file name is compliant (ignore hidden files like .keep or directory)
if !strings.HasPrefix(filename, ".") && cfgFileName != "" && !file.IsDir() {
// Create new viper instance
vip := viper.New()
// Set config name
vip.SetConfigName(cfgFileName)
// Add configuration path
vip.AddConfigPath(mainConfDir)
// Append it
list = append(list, vip)
}
})
return list
}
func (impl *managerimpl) loadConfiguration() error {
// Load must start by flushing all existing watcher on internal files
for i := range len(impl.internalFileWatchChannels) {
ch := impl.internalFileWatchChannels[i]
// Send the force stop
ch <- true
}
// Create a viper instance for default value and merging
globalViper := viper.New()
// Put default values
impl.loadDefaultConfigurationValues(globalViper)
// Loop over configs
for _, vip := range impl.configs {
err := vip.ReadInConfig()
if err != nil {
return errors.WithStack(err)
}
err = globalViper.MergeConfigMap(vip.AllSettings())
if err != nil {
return errors.WithStack(err)
}
}
// Prepare configuration object
var out Config
// Quick unmarshal.
err := globalViper.Unmarshal(&out)
if err != nil {
return errors.WithStack(err)
}
// Load default values
err = loadBusinessDefaultValues(&out)
if err != nil {
return err
}
// Configuration validation
err = validate.Struct(out)
if err != nil {
return errors.WithStack(err)
}
// Load all credentials
credentials, err := loadAllCredentials(&out)
if err != nil {
return err
}
// Initialize or flush watch internal file channels
internalFileWatchChannels := make([]chan bool, 0)
impl.internalFileWatchChannels = internalFileWatchChannels
// Loop over all credentials in order to watch file change
funk.ForEach(credentials, func(cred *CredentialConfig) {
// Check if credential is about a path
if cred.Path != "" {
// Create channel
ch := make(chan bool)
// Run the watch file
impl.watchInternalFile(cred.Path, ch, func() {
// File change detected
impl.logger.Infof("Reload credential file detected for path %s", cred.Path)
// Reload config
err2 := loadCredential(cred)
if err2 != nil {
impl.logger.Error(err2)
// Stop here and do not call hooks => configuration is unstable
return
}
// Call all hooks
funk.ForEach(impl.onChangeHooks, func(hook func()) { hook() })
})
// Add channel to list of channels
impl.internalFileWatchChannels = append(impl.internalFileWatchChannels, ch)
}
})
err = validateBusinessConfig(&out)
if err != nil {
return err
}
impl.cfg = &out
return nil
}
// GetConfig allow to get configuration object.
func (impl *managerimpl) GetConfig() *Config {
return impl.cfg
}
func loadAllCredentials(out *Config) ([]*CredentialConfig, error) {
// Initialize answer
result := make([]*CredentialConfig, 0)
// Load credentials from declaration
for _, item := range out.Targets {
// Check if resources are declared
if item.Resources != nil {
for j := range len(item.Resources) {
// Store ressource
res := item.Resources[j]
// Check if basic auth configuration exists
if res.Basic != nil && res.Basic.Credentials != nil {
// Loop over creds
for k := range len(res.Basic.Credentials) {
it := res.Basic.Credentials[k]
// Load credential
err := loadCredential(it.Password)
if err != nil {
return nil, err
}
// Save credential
result = append(result, it.Password)
}
}
}
}
// Check if actions are declared
if item.Actions != nil {
// Check if GET actions are declared and webhook configs
if item.Actions.GET != nil && item.Actions.GET.Config != nil {
// Load webhook secrets
res, err := loadWebhookCfgCredentials(item.Actions.GET.Config.Webhooks)
// Check error
if err != nil {
return nil, err
}
// Save credential
result = append(result, res...)
}
// Check if PUT actions are declared and webhook configs
if item.Actions.PUT != nil && item.Actions.PUT.Config != nil {
// Load webhook secrets
res, err := loadWebhookCfgCredentials(item.Actions.PUT.Config.Webhooks)
// Check error
if err != nil {
return nil, err
}
// Save credential
result = append(result, res...)
}
// Check if DELETE actions are declared and webhook configs
if item.Actions.DELETE != nil && item.Actions.DELETE.Config != nil {
// Load webhook secrets
res, err := loadWebhookCfgCredentials(item.Actions.DELETE.Config.Webhooks)
// Check error
if err != nil {
return nil, err
}
// Save credential
result = append(result, res...)
}
}
// Load credentials for access key and secret key
if item.Bucket.Credentials != nil && item.Bucket.Credentials.AccessKey != nil && item.Bucket.Credentials.SecretKey != nil {
// Manage access key
err := loadCredential(item.Bucket.Credentials.AccessKey)
if err != nil {
return nil, err
}
// Manage secret key
err = loadCredential(item.Bucket.Credentials.SecretKey)
if err != nil {
return nil, err
}
// Save credential
result = append(result, item.Bucket.Credentials.AccessKey, item.Bucket.Credentials.SecretKey)
}
}
// Load auth credentials
if out.AuthProviders != nil {
// Load credentials for oidc auth if needed
if out.AuthProviders.OIDC != nil {
// Load credentials for oidc auth if needed
for _, v := range out.AuthProviders.OIDC {
// Check if client secret exists
if v.ClientSecret != nil {
err := loadCredential(v.ClientSecret)
if err != nil {
return nil, err
}
// Save credential
result = append(result, v.ClientSecret)
}
}
}
}
// Load auth credentials from list targets with basic auth
if out.ListTargets != nil && out.ListTargets.Resource != nil &&
out.ListTargets.Resource.Basic != nil && out.ListTargets.Resource.Basic.Credentials != nil {
// Loop over credentials declared
for i := range len(out.ListTargets.Resource.Basic.Credentials) {
// Store item access
it := out.ListTargets.Resource.Basic.Credentials[i]
// Load credential
err := loadCredential(it.Password)
if err != nil {
return nil, err
}
// Save credential
result = append(result, it.Password)
}
}
// Load SSL S3 credentials from server/internal server
if out.Server != nil {
serverCreds, err := loadServerSSLCredentials(out.Server)
if err != nil {
return nil, err
}
result = append(result, serverCreds...)
}
if out.InternalServer != nil {
serverCreds, err := loadServerSSLCredentials(out.InternalServer)
if err != nil {
return nil, err
}
result = append(result, serverCreds...)
}
return result, nil
}
// loadServerSSLCredentials is used for any bucket-specific credentials under the
// {server/internalServer}.ssl.certificates[*].certificateUrlConfig / privateKeyUrlConfig branches.
func loadServerSSLCredentials(serverConfig *ServerConfig) ([]*CredentialConfig, error) {
if serverConfig.SSL == nil {
return nil, nil
}
res := make([]*CredentialConfig, 0)
for _, cert := range serverConfig.SSL.Certificates {
if cert.CertificateURLConfig != nil && cert.CertificateURLConfig.AWSCredentials != nil {
s3Creds := cert.CertificateURLConfig.AWSCredentials
if s3Creds.AccessKey != nil {
err := loadCredential(s3Creds.AccessKey)
if err != nil {
return nil, err
}
}
if s3Creds.SecretKey != nil {
err := loadCredential(s3Creds.SecretKey)
if err != nil {
return nil, err
}
}
}
if cert.PrivateKeyURLConfig != nil && cert.PrivateKeyURLConfig.AWSCredentials != nil {
s3Creds := cert.PrivateKeyURLConfig.AWSCredentials
if s3Creds.AccessKey != nil {
err := loadCredential(s3Creds.AccessKey)
if err != nil {
return nil, err
}
}
if s3Creds.SecretKey != nil {
err := loadCredential(s3Creds.SecretKey)
if err != nil {
return nil, err
}
}
}
}
return res, nil
}
func loadWebhookCfgCredentials(cfgList []*WebhookConfig) ([]*CredentialConfig, error) {
// Create result
res := make([]*CredentialConfig, 0)
// Loop over the list
for _, wbCfg := range cfgList {
// Loop over the secret header
for _, secCre := range wbCfg.SecretHeaders {
// Loop credential
err := loadCredential(secCre)
// Check error
if err != nil {
return nil, err
}
// Save
res = append(res, secCre)
}
}
// Default
return res, nil
}
func loadCredential(credCfg *CredentialConfig) error {
if credCfg.Path != "" {
// Secret file
databytes, err := os.ReadFile(credCfg.Path)
if err != nil {
return errors.WithStack(err)
}
// Store val
val := string(databytes)
// Clean new lines
val = generalutils.NewLineMatcherRegex.ReplaceAllString(val, "")
credCfg.Value = val
} else if credCfg.Env != "" {
// Environment variable
envValue := os.Getenv(credCfg.Env)
if envValue == "" {
err := fmt.Errorf(TemplateErrLoadingEnvCredentialEmpty, credCfg.Env)
return errors.WithStack(err)
}
// Store value
credCfg.Value = envValue
}
// Default value
return nil
}
func loadResourceValues(res *Resource) error {
// Check if resource has methods
if res.Methods == nil {
// Set default values
res.Methods = []string{http.MethodGet}
}
// Check if regexp is enabled in OIDC Authorization groups
if res.OIDC != nil && res.OIDC.AuthorizationAccesses != nil {
for _, item := range res.OIDC.AuthorizationAccesses {
err2 := loadRegexOIDCAuthorizationAccess(item)
if err2 != nil {
return err2
}
}
}
// Check if tags are set in OPA server authorizations
if res.OIDC != nil && res.OIDC.AuthorizationOPAServer != nil && res.OIDC.AuthorizationOPAServer.Tags == nil {
res.OIDC.AuthorizationOPAServer.Tags = map[string]string{}
}
return nil
}
func loadBusinessDefaultValues(out *Config) error {
// Manage default values for targets
for key, item := range out.Targets {
// Put target name in structure with key as value
item.Name = key
// Manage default configuration for target region
if item.Bucket != nil && item.Bucket.Region == "" {
item.Bucket.Region = DefaultBucketRegion
}
// Manage default configuration for bucket S3 List Max Keys
if item.Bucket != nil && item.Bucket.S3ListMaxKeys == 0 {
item.Bucket.S3ListMaxKeys = DefaultBucketS3ListMaxKeys
}
// Manage default s3 max upload parts
if item.Bucket != nil && item.Bucket.S3MaxUploadParts == 0 {
item.Bucket.S3MaxUploadParts = DefaultS3MaxUploadParts
}
// Manage default s3 upload part size
if item.Bucket != nil && item.Bucket.S3UploadPartSize == 0 {
item.Bucket.S3UploadPartSize = DefaultS3UploadPartSize
}
// Manage default s3 upload concurrency
if item.Bucket != nil && item.Bucket.S3UploadConcurrency == 0 {
item.Bucket.S3UploadConcurrency = DefaultS3UploadConcurrency
}
// Manage default configuration for target actions
if item.Actions == nil {
item.Actions = &ActionsConfig{GET: &GetActionConfig{Enabled: true}}
}
// Manage values for signed url
if item.Actions != nil && item.Actions.GET != nil && item.Actions.GET.Config != nil {
// Check if expiration is set
if item.Actions.GET.Config.SignedURLExpirationString != "" {
// Parse it
dur, err := time.ParseDuration(item.Actions.GET.Config.SignedURLExpirationString)
// Check error
if err != nil {
return errors.WithStack(err)
}
// Save
item.Actions.GET.Config.SignedURLExpiration = dur
} else {
// Set default one
item.Actions.GET.Config.SignedURLExpiration = DefaultTargetActionsGETConfigSignedURLExpiration
}
}
// Manage default for target templates configurations
// Else put default headers for template override
if item.Templates == nil {
item.Templates = &TargetTemplateConfig{}
} else {
// Check if folder list template have been override and not headers
if item.Templates.FolderList != nil && item.Templates.FolderList.Headers == nil {
item.Templates.FolderList.Headers = DefaultTemplateHeaders
}
// Check if not found error template have been override and not headers
if item.Templates.NotFoundError != nil && item.Templates.NotFoundError.Headers == nil {
item.Templates.NotFoundError.Headers = DefaultTemplateHeaders
}
// Check if internal server error template have been override and not headers
if item.Templates.InternalServerError != nil && item.Templates.InternalServerError.Headers == nil {
item.Templates.InternalServerError.Headers = DefaultTemplateHeaders
}
// Check if forbidden error template have been override and not headers
if item.Templates.ForbiddenError != nil && item.Templates.ForbiddenError.Headers == nil {
item.Templates.ForbiddenError.Headers = DefaultTemplateHeaders
}
// Check if unauthorized error template have been override and not headers
if item.Templates.UnauthorizedError != nil && item.Templates.UnauthorizedError.Headers == nil {
item.Templates.UnauthorizedError.Headers = DefaultTemplateHeaders
}
// Check if bad request error template have been override and not headers
if item.Templates.BadRequestError != nil && item.Templates.BadRequestError.Headers == nil {
item.Templates.BadRequestError.Headers = DefaultTemplateHeaders
}
// Check if put template have been override and not headers
if item.Templates.Put != nil && item.Templates.Put.Headers == nil {
item.Templates.Put.Headers = DefaultEmptyTemplateHeaders
}
// Check if delete template have been override and not headers
if item.Templates.Delete != nil && item.Templates.Delete.Headers == nil {
item.Templates.Delete.Headers = DefaultEmptyTemplateHeaders
}
}
// Manage default value for resources methods
if item.Resources != nil {
for _, res := range item.Resources {
// Load default resource values
err := loadResourceValues(res)
if err != nil {
return err
}
}
}
// Manage key write list
if item.KeyRewriteList != nil {
// Loop over keys
for _, it := range item.KeyRewriteList {
// Load key rewrite
err := loadKeyRewriteValues(it)
// Check error
if err != nil {
return err
}
}
}
}
// Manage default value for list targets resources
if out.ListTargets != nil && out.ListTargets.Resource != nil {
// Store resource object
res := out.ListTargets.Resource
// Load default resource values
err := loadResourceValues(res)
if err != nil {
return err
}
}
// Manage default values for auth providers
if out.AuthProviders != nil && out.AuthProviders.OIDC != nil {
for k, v := range out.AuthProviders.OIDC {
// Manage default scopes
if v.Scopes == nil || len(v.Scopes) == 0 {
v.Scopes = DefaultOIDCScopes
}
// Manage default group claim
if v.GroupClaim == "" {
v.GroupClaim = DefaultOIDCGroupClaim
}
// Manage default oidc cookie name
if v.CookieName == "" {
v.CookieName = DefaultOIDCCookieName
}
// Check if login path is defined
if v.LoginPath == "" {
v.LoginPath = fmt.Sprintf(oidcLoginPathTemplate, k)
}
// Check if callback path is defined
if v.CallbackPath == "" {
v.CallbackPath = fmt.Sprintf(oidcCallbackPathTemplate, k)
}
}
}
// Manage default value for list targets
if out.ListTargets == nil {
out.ListTargets = &ListTargetsConfig{Enabled: false}
}
// Manage default value for tracing
if out.Tracing == nil {
out.Tracing = &TracingConfig{Enabled: false}
}
// Manage default values for metrics configuration
if out.Metrics == nil {
out.Metrics = &MetricsConfig{}
}
return nil
}
func loadKeyRewriteValues(item *TargetKeyRewriteConfig) error {
// Check if target type is set, if not, put REGEX type as default
if item.TargetType == "" {
item.TargetType = RegexTargetKeyRewriteTargetType
}
// Parse source regex
rs, err := regexp.Compile(item.Source)
// Check error
if err != nil {
return errors.WithStack(err)
}
// Save source
item.SourceRegex = rs
// Default value
return nil
}
// Load Regex in OIDC Authorization access objects.
func loadRegexOIDCAuthorizationAccess(item *HeaderOIDCAuthorizationAccess) error {
if item.Regexp {
// Try to compile regex for group or email
// Group case
if item.Group != "" {
// Compile Regexp
reg, err2 := regexp.Compile(item.Group)
// Check error
if err2 != nil {
return errors.WithStack(err2)
}
// Save regexp
item.GroupRegexp = reg
}
// Email case
if item.Email != "" {
// Compile regexp
reg, err2 := regexp.Compile(item.Email)
// Check error
if err2 != nil {
return errors.WithStack(err2)
}
// Save regexp
item.EmailRegexp = reg
}
}
return nil
}