frostfs-s3-gw/legacy/config/config.go

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/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* 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 (
"bufio"
"fmt"
"io"
"regexp"
"strings"
"github.com/minio/minio-go/v6/pkg/set"
"github.com/minio/minio/pkg/auth"
"github.com/minio/minio/pkg/env"
"github.com/minio/minio/pkg/madmin"
)
// Error config error type
type Error struct {
Err string
}
// Errorf - formats according to a format specifier and returns
// the string as a value that satisfies error of type config.Error
func Errorf(format string, a ...interface{}) error {
return Error{Err: fmt.Sprintf(format, a...)}
}
func (e Error) Error() string {
return e.Err
}
// Default keys
const (
Default = madmin.Default
Enable = madmin.EnableKey
Comment = madmin.CommentKey
// Enable values
EnableOn = madmin.EnableOn
EnableOff = madmin.EnableOff
RegionName = "name"
AccessKey = "access_key"
SecretKey = "secret_key"
)
// Top level config constants.
const (
CredentialsSubSys = "credentials"
PolicyOPASubSys = "policy_opa"
IdentityOpenIDSubSys = "identity_openid"
IdentityLDAPSubSys = "identity_ldap"
CacheSubSys = "cache"
RegionSubSys = "region"
EtcdSubSys = "etcd"
StorageClassSubSys = "storage_class"
APISubSys = "api"
CompressionSubSys = "compression"
KmsVaultSubSys = "kms_vault"
KmsKesSubSys = "kms_kes"
LoggerWebhookSubSys = "logger_webhook"
AuditWebhookSubSys = "audit_webhook"
// Add new constants here if you add new fields to config.
)
// Notification config constants.
const (
NotifyKafkaSubSys = "notify_kafka"
NotifyMQTTSubSys = "notify_mqtt"
NotifyMySQLSubSys = "notify_mysql"
NotifyNATSSubSys = "notify_nats"
NotifyNSQSubSys = "notify_nsq"
NotifyESSubSys = "notify_elasticsearch"
NotifyAMQPSubSys = "notify_amqp"
NotifyPostgresSubSys = "notify_postgres"
NotifyRedisSubSys = "notify_redis"
NotifyWebhookSubSys = "notify_webhook"
// Add new constants here if you add new fields to config.
)
// SubSystems - all supported sub-systems
var SubSystems = set.CreateStringSet([]string{
CredentialsSubSys,
RegionSubSys,
EtcdSubSys,
CacheSubSys,
APISubSys,
StorageClassSubSys,
CompressionSubSys,
KmsVaultSubSys,
KmsKesSubSys,
LoggerWebhookSubSys,
AuditWebhookSubSys,
PolicyOPASubSys,
IdentityLDAPSubSys,
IdentityOpenIDSubSys,
NotifyAMQPSubSys,
NotifyESSubSys,
NotifyKafkaSubSys,
NotifyMQTTSubSys,
NotifyMySQLSubSys,
NotifyNATSSubSys,
NotifyNSQSubSys,
NotifyPostgresSubSys,
NotifyRedisSubSys,
NotifyWebhookSubSys,
}...)
// SubSystemsSingleTargets - subsystems which only support single target.
var SubSystemsSingleTargets = set.CreateStringSet([]string{
CredentialsSubSys,
RegionSubSys,
EtcdSubSys,
CacheSubSys,
APISubSys,
StorageClassSubSys,
CompressionSubSys,
KmsVaultSubSys,
KmsKesSubSys,
PolicyOPASubSys,
IdentityLDAPSubSys,
IdentityOpenIDSubSys,
}...)
// Constant separators
const (
SubSystemSeparator = madmin.SubSystemSeparator
KvSeparator = madmin.KvSeparator
KvSpaceSeparator = madmin.KvSpaceSeparator
KvComment = madmin.KvComment
KvNewline = madmin.KvNewline
KvDoubleQuote = madmin.KvDoubleQuote
KvSingleQuote = madmin.KvSingleQuote
// Env prefix used for all envs in MinIO
EnvPrefix = "MINIO_"
EnvWordDelimiter = `_`
)
// DefaultKVS - default kvs for all sub-systems
var DefaultKVS map[string]KVS
// RegisterDefaultKVS - this function saves input kvsMap
// globally, this should be called only once preferably
// during `init()`.
func RegisterDefaultKVS(kvsMap map[string]KVS) {
DefaultKVS = map[string]KVS{}
for subSys, kvs := range kvsMap {
DefaultKVS[subSys] = kvs
}
}
// HelpSubSysMap - help for all individual KVS for each sub-systems
// also carries a special empty sub-system which dumps
// help for each sub-system key.
var HelpSubSysMap map[string]HelpKVS
// RegisterHelpSubSys - this function saves
// input help KVS for each sub-system globally,
// this function should be called only once
// preferably in during `init()`.
func RegisterHelpSubSys(helpKVSMap map[string]HelpKVS) {
HelpSubSysMap = map[string]HelpKVS{}
for subSys, hkvs := range helpKVSMap {
HelpSubSysMap[subSys] = hkvs
}
}
// KV - is a shorthand of each key value.
type KV struct {
Key string `json:"key"`
Value string `json:"value"`
}
// KVS - is a shorthand for some wrapper functions
// to operate on list of key values.
type KVS []KV
// Empty - return if kv is empty
func (kvs KVS) Empty() bool {
return len(kvs) == 0
}
// Keys returns the list of keys for the current KVS
func (kvs KVS) Keys() []string {
var keys = make([]string, len(kvs))
var foundComment bool
for i := range kvs {
if kvs[i].Key == madmin.CommentKey {
foundComment = true
}
keys[i] = kvs[i].Key
}
// Comment KV not found, add it explicitly.
if !foundComment {
keys = append(keys, madmin.CommentKey)
}
return keys
}
func (kvs KVS) String() string {
var s strings.Builder
for _, kv := range kvs {
// Do not need to print if state is on
if kv.Key == Enable && kv.Value == EnableOn {
continue
}
s.WriteString(kv.Key)
s.WriteString(KvSeparator)
spc := madmin.HasSpace(kv.Value)
if spc {
s.WriteString(KvDoubleQuote)
}
s.WriteString(kv.Value)
if spc {
s.WriteString(KvDoubleQuote)
}
s.WriteString(KvSpaceSeparator)
}
return s.String()
}
// Set sets a value, if not sets a default value.
func (kvs *KVS) Set(key, value string) {
for i, kv := range *kvs {
if kv.Key == key {
(*kvs)[i] = KV{
Key: key,
Value: value,
}
return
}
}
*kvs = append(*kvs, KV{
Key: key,
Value: value,
})
}
// Get - returns the value of a key, if not found returns empty.
func (kvs KVS) Get(key string) string {
v, ok := kvs.Lookup(key)
if ok {
return v
}
return ""
}
// Lookup - lookup a key in a list of KVS
func (kvs KVS) Lookup(key string) (string, bool) {
for _, kv := range kvs {
if kv.Key == key {
return kv.Value, true
}
}
return "", false
}
// Config - MinIO server config structure.
type Config map[string]map[string]KVS
// DelFrom - deletes all keys in the input reader.
func (c Config) DelFrom(r io.Reader) error {
scanner := bufio.NewScanner(r)
for scanner.Scan() {
// Skip any empty lines, or comment like characters
text := scanner.Text()
if text == "" || strings.HasPrefix(text, KvComment) {
continue
}
if err := c.DelKVS(text); err != nil {
return err
}
}
if err := scanner.Err(); err != nil {
return err
}
return nil
}
// ReadFrom - implements io.ReaderFrom interface
func (c Config) ReadFrom(r io.Reader) (int64, error) {
var n int
scanner := bufio.NewScanner(r)
for scanner.Scan() {
// Skip any empty lines, or comment like characters
text := scanner.Text()
if text == "" || strings.HasPrefix(text, KvComment) {
continue
}
if err := c.SetKVS(text, DefaultKVS); err != nil {
return 0, err
}
n += len(text)
}
if err := scanner.Err(); err != nil {
return 0, err
}
return int64(n), nil
}
type configWriteTo struct {
Config
filterByKey string
}
// NewConfigWriteTo - returns a struct which
// allows for serializing the config/kv struct
// to a io.WriterTo
func NewConfigWriteTo(cfg Config, key string) io.WriterTo {
return &configWriteTo{Config: cfg, filterByKey: key}
}
// WriteTo - implements io.WriterTo interface implementation for config.
func (c *configWriteTo) WriteTo(w io.Writer) (int64, error) {
kvsTargets, err := c.GetKVS(c.filterByKey, DefaultKVS)
if err != nil {
return 0, err
}
var n int
for _, target := range kvsTargets {
m1, _ := w.Write([]byte(target.SubSystem))
m2, _ := w.Write([]byte(KvSpaceSeparator))
m3, _ := w.Write([]byte(target.KVS.String()))
if len(kvsTargets) > 1 {
m4, _ := w.Write([]byte(KvNewline))
n += m1 + m2 + m3 + m4
} else {
n += m1 + m2 + m3
}
}
return int64(n), nil
}
// Default KV configs for worm and region
var (
DefaultCredentialKVS = KVS{
KV{
Key: AccessKey,
Value: auth.DefaultAccessKey,
},
KV{
Key: SecretKey,
Value: auth.DefaultSecretKey,
},
}
DefaultRegionKVS = KVS{
KV{
Key: RegionName,
Value: "",
},
}
)
// LookupCreds - lookup credentials from config.
func LookupCreds(kv KVS) (auth.Credentials, error) {
if err := CheckValidKeys(CredentialsSubSys, kv, DefaultCredentialKVS); err != nil {
return auth.Credentials{}, err
}
accessKey := kv.Get(AccessKey)
secretKey := kv.Get(SecretKey)
if accessKey == "" || secretKey == "" {
accessKey = auth.DefaultAccessKey
secretKey = auth.DefaultSecretKey
}
return auth.CreateCredentials(accessKey, secretKey)
}
var validRegionRegex = regexp.MustCompile("^[a-zA-Z][a-zA-Z0-9-_-]+$")
// LookupRegion - get current region.
func LookupRegion(kv KVS) (string, error) {
if err := CheckValidKeys(RegionSubSys, kv, DefaultRegionKVS); err != nil {
return "", err
}
region := env.Get(EnvRegion, "")
if region == "" {
region = env.Get(EnvRegionName, kv.Get(RegionName))
}
if region != "" {
if validRegionRegex.MatchString(region) {
return region, nil
}
return "", Errorf(
"region '%s' is invalid, expected simple characters such as [us-east-1, myregion...]",
region)
}
return "", nil
}
// CheckValidKeys - checks if inputs KVS has the necessary keys,
// returns error if it find extra or superflous keys.
func CheckValidKeys(subSys string, kv KVS, validKVS KVS) error {
nkv := KVS{}
for _, kv := range kv {
// Comment is a valid key, its also fully optional
// ignore it since it is a valid key for all
// sub-systems.
if kv.Key == Comment {
continue
}
if _, ok := validKVS.Lookup(kv.Key); !ok {
nkv = append(nkv, kv)
}
}
if len(nkv) > 0 {
return Errorf(
"found invalid keys (%s) for '%s' sub-system, use 'mc admin config reset myminio %s' to fix invalid keys", nkv.String(), subSys, subSys)
}
return nil
}
// LookupWorm - check if worm is enabled
func LookupWorm() (bool, error) {
return ParseBool(env.Get(EnvWorm, EnableOff))
}
// Merge - merges a new config with all the
// missing values for default configs,
// returns a config.
func (c Config) Merge() Config {
cp := New()
for subSys, tgtKV := range c {
for tgt := range tgtKV {
ckvs := c[subSys][tgt]
for _, kv := range cp[subSys][Default] {
_, ok := c[subSys][tgt].Lookup(kv.Key)
if !ok {
ckvs.Set(kv.Key, kv.Value)
}
}
cp[subSys][tgt] = ckvs
}
}
return cp
}
// New - initialize a new server config.
func New() Config {
srvCfg := make(Config)
for _, k := range SubSystems.ToSlice() {
srvCfg[k] = map[string]KVS{}
srvCfg[k][Default] = DefaultKVS[k]
}
return srvCfg
}
// Target signifies an individual target
type Target struct {
SubSystem string
KVS KVS
}
// Targets sub-system targets
type Targets []Target
// GetKVS - get kvs from specific subsystem.
func (c Config) GetKVS(s string, defaultKVS map[string]KVS) (Targets, error) {
if len(s) == 0 {
return nil, Errorf("input cannot be empty")
}
inputs := strings.Fields(s)
if len(inputs) > 1 {
return nil, Errorf("invalid number of arguments %s", s)
}
subSystemValue := strings.SplitN(inputs[0], SubSystemSeparator, 2)
if len(subSystemValue) == 0 {
return nil, Errorf("invalid number of arguments %s", s)
}
found := SubSystems.Contains(subSystemValue[0])
if !found {
// Check for sub-prefix only if the input value is only a
// single value, this rejects invalid inputs if any.
found = !SubSystems.FuncMatch(strings.HasPrefix, subSystemValue[0]).IsEmpty() && len(subSystemValue) == 1
}
if !found {
return nil, Errorf("unknown sub-system %s", s)
}
targets := Targets{}
subSysPrefix := subSystemValue[0]
if len(subSystemValue) == 2 {
if len(subSystemValue[1]) == 0 {
return nil, Errorf("sub-system target '%s' cannot be empty", s)
}
kvs, ok := c[subSysPrefix][subSystemValue[1]]
if !ok {
return nil, Errorf("sub-system target '%s' doesn't exist", s)
}
for _, kv := range defaultKVS[subSysPrefix] {
_, ok = kvs.Lookup(kv.Key)
if !ok {
kvs.Set(kv.Key, kv.Value)
}
}
targets = append(targets, Target{
SubSystem: inputs[0],
KVS: kvs,
})
} else {
hkvs := HelpSubSysMap[""]
// Use help for sub-system to preserve the order.
for _, hkv := range hkvs {
if !strings.HasPrefix(hkv.Key, subSysPrefix) {
continue
}
if c[hkv.Key][Default].Empty() {
targets = append(targets, Target{
SubSystem: hkv.Key,
KVS: defaultKVS[hkv.Key],
})
}
for k, kvs := range c[hkv.Key] {
for _, dkv := range defaultKVS[hkv.Key] {
_, ok := kvs.Lookup(dkv.Key)
if !ok {
kvs.Set(dkv.Key, dkv.Value)
}
}
if k != Default {
targets = append(targets, Target{
SubSystem: hkv.Key + SubSystemSeparator + k,
KVS: kvs,
})
} else {
targets = append(targets, Target{
SubSystem: hkv.Key,
KVS: kvs,
})
}
}
}
}
return targets, nil
}
// DelKVS - delete a specific key.
func (c Config) DelKVS(s string) error {
if len(s) == 0 {
return Errorf("input arguments cannot be empty")
}
inputs := strings.Fields(s)
if len(inputs) > 1 {
return Errorf("invalid number of arguments %s", s)
}
subSystemValue := strings.SplitN(inputs[0], SubSystemSeparator, 2)
if len(subSystemValue) == 0 {
return Errorf("invalid number of arguments %s", s)
}
if !SubSystems.Contains(subSystemValue[0]) {
// Unknown sub-system found try to remove it anyways.
delete(c, subSystemValue[0])
return nil
}
tgt := Default
subSys := subSystemValue[0]
if len(subSystemValue) == 2 {
if len(subSystemValue[1]) == 0 {
return Errorf("sub-system target '%s' cannot be empty", s)
}
tgt = subSystemValue[1]
}
_, ok := c[subSys][tgt]
if !ok {
return Errorf("sub-system %s already deleted", s)
}
delete(c[subSys], tgt)
return nil
}
// Clone - clones a config map entirely.
func (c Config) Clone() Config {
cp := New()
for subSys, tgtKV := range c {
cp[subSys] = make(map[string]KVS)
for tgt, kv := range tgtKV {
cp[subSys][tgt] = append(cp[subSys][tgt], kv...)
}
}
return cp
}
// SetKVS - set specific key values per sub-system.
func (c Config) SetKVS(s string, defaultKVS map[string]KVS) error {
if len(s) == 0 {
return Errorf("input arguments cannot be empty")
}
inputs := strings.SplitN(s, KvSpaceSeparator, 2)
if len(inputs) <= 1 {
return Errorf("invalid number of arguments '%s'", s)
}
subSystemValue := strings.SplitN(inputs[0], SubSystemSeparator, 2)
if len(subSystemValue) == 0 {
return Errorf("invalid number of arguments %s", s)
}
if !SubSystems.Contains(subSystemValue[0]) {
return Errorf("unknown sub-system %s", s)
}
if SubSystemsSingleTargets.Contains(subSystemValue[0]) && len(subSystemValue) == 2 {
return Errorf("sub-system '%s' only supports single target", subSystemValue[0])
}
tgt := Default
subSys := subSystemValue[0]
if len(subSystemValue) == 2 {
tgt = subSystemValue[1]
}
fields := madmin.KvFields(inputs[1], defaultKVS[subSys].Keys())
if len(fields) == 0 {
return Errorf("sub-system '%s' cannot have empty keys", subSys)
}
var kvs = KVS{}
var prevK string
for _, v := range fields {
kv := strings.SplitN(v, KvSeparator, 2)
if len(kv) == 0 {
continue
}
if len(kv) == 1 && prevK != "" {
value := strings.Join([]string{
kvs.Get(prevK),
madmin.SanitizeValue(kv[0]),
}, KvSpaceSeparator)
kvs.Set(prevK, value)
continue
}
if len(kv) == 2 {
prevK = kv[0]
kvs.Set(prevK, madmin.SanitizeValue(kv[1]))
continue
}
return Errorf("key '%s', cannot have empty value", kv[0])
}
_, ok := kvs.Lookup(Enable)
// Check if state is required
_, enableRequired := defaultKVS[subSys].Lookup(Enable)
if !ok && enableRequired {
// implicit state "on" if not specified.
kvs.Set(Enable, EnableOn)
}
currKVS, ok := c[subSys][tgt]
if !ok {
currKVS = defaultKVS[subSys]
} else {
for _, kv := range defaultKVS[subSys] {
if _, ok = currKVS.Lookup(kv.Key); !ok {
currKVS.Set(kv.Key, kv.Value)
}
}
}
for _, kv := range kvs {
if kv.Key == Comment {
// Skip comment and add it later.
continue
}
currKVS.Set(kv.Key, kv.Value)
}
v, ok := kvs.Lookup(Comment)
if ok {
currKVS.Set(Comment, v)
}
hkvs := HelpSubSysMap[subSys]
for _, hkv := range hkvs {
var enabled bool
if enableRequired {
enabled = currKVS.Get(Enable) == EnableOn
} else {
// when enable arg is not required
// then it is implicit on for the sub-system.
enabled = true
}
v, _ := currKVS.Lookup(hkv.Key)
if v == "" && !hkv.Optional && enabled {
// Return error only if the
// key is enabled, for state=off
// let it be empty.
return Errorf(
"'%s' is not optional for '%s' sub-system, please check '%s' documentation",
hkv.Key, subSys, subSys)
}
}
c[subSys][tgt] = currKVS
return nil
}