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forgejo/models/system/setting.go

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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package system
import (
"context"
"fmt"
"net/url"
"strconv"
"strings"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/cache"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"strk.kbt.io/projects/go/libravatar"
"xorm.io/builder"
)
// Setting is a key value store of user settings
type Setting struct {
ID int64 `xorm:"pk autoincr"`
SettingKey string `xorm:"varchar(255) unique"` // ensure key is always lowercase
SettingValue string `xorm:"text"`
Version int `xorm:"version"` // prevent to override
Created timeutil.TimeStamp `xorm:"created"`
Updated timeutil.TimeStamp `xorm:"updated"`
}
// TableName sets the table name for the settings struct
func (s *Setting) TableName() string {
return "system_setting"
}
func (s *Setting) GetValueBool() bool {
if s == nil {
return false
}
b, _ := strconv.ParseBool(s.SettingValue)
return b
}
func init() {
db.RegisterModel(new(Setting))
}
// ErrSettingIsNotExist represents an error that a setting is not exist with special key
type ErrSettingIsNotExist struct {
Key string
}
// Error implements error
func (err ErrSettingIsNotExist) Error() string {
return fmt.Sprintf("System setting[%s] is not exist", err.Key)
}
// IsErrSettingIsNotExist return true if err is ErrSettingIsNotExist
func IsErrSettingIsNotExist(err error) bool {
_, ok := err.(ErrSettingIsNotExist)
return ok
}
// ErrDataExpired represents an error that update a record which has been updated by another thread
type ErrDataExpired struct {
Key string
}
// Error implements error
func (err ErrDataExpired) Error() string {
return fmt.Sprintf("System setting[%s] has been updated by another thread", err.Key)
}
// IsErrDataExpired return true if err is ErrDataExpired
func IsErrDataExpired(err error) bool {
_, ok := err.(ErrDataExpired)
return ok
}
// GetSettingNoCache returns specific setting without using the cache
func GetSettingNoCache(key string) (*Setting, error) {
v, err := GetSettings([]string{key})
if err != nil {
return nil, err
}
if len(v) == 0 {
return nil, ErrSettingIsNotExist{key}
}
return v[key], nil
}
// GetSetting returns the setting value via the key
func GetSetting(key string) (*Setting, error) {
return cache.Get(genSettingCacheKey(key), func() (*Setting, error) {
res, err := GetSettingNoCache(key)
if err != nil {
return nil, err
}
return res, nil
})
}
// GetSettingBool return bool value of setting,
// none existing keys and errors are ignored and result in false
func GetSettingBool(key string) bool {
s, _ := GetSetting(key)
return s.GetValueBool()
}
// GetSettings returns specific settings
func GetSettings(keys []string) (map[string]*Setting, error) {
for i := 0; i < len(keys); i++ {
keys[i] = strings.ToLower(keys[i])
}
settings := make([]*Setting, 0, len(keys))
if err := db.GetEngine(db.DefaultContext).
Where(builder.In("setting_key", keys)).
Find(&settings); err != nil {
return nil, err
}
settingsMap := make(map[string]*Setting)
for _, s := range settings {
settingsMap[s.SettingKey] = s
}
return settingsMap, nil
}
type AllSettings map[string]*Setting
func (settings AllSettings) Get(key string) Setting {
if v, ok := settings[key]; ok {
return *v
}
return Setting{}
}
func (settings AllSettings) GetBool(key string) bool {
b, _ := strconv.ParseBool(settings.Get(key).SettingValue)
return b
}
func (settings AllSettings) GetVersion(key string) int {
return settings.Get(key).Version
}
// GetAllSettings returns all settings from user
func GetAllSettings() (AllSettings, error) {
settings := make([]*Setting, 0, 5)
if err := db.GetEngine(db.DefaultContext).
Find(&settings); err != nil {
return nil, err
}
settingsMap := make(map[string]*Setting)
for _, s := range settings {
settingsMap[s.SettingKey] = s
}
return settingsMap, nil
}
// DeleteSetting deletes a specific setting for a user
func DeleteSetting(setting *Setting) error {
cache.Remove(genSettingCacheKey(setting.SettingKey))
_, err := db.GetEngine(db.DefaultContext).Delete(setting)
return err
}
func SetSettingNoVersion(key, value string) error {
s, err := GetSettingNoCache(key)
if IsErrSettingIsNotExist(err) {
return SetSetting(&Setting{
SettingKey: key,
SettingValue: value,
})
}
if err != nil {
return err
}
s.SettingValue = value
return SetSetting(s)
}
// SetSetting updates a users' setting for a specific key
func SetSetting(setting *Setting) error {
_, err := cache.Set(genSettingCacheKey(setting.SettingKey), func() (*Setting, error) {
return setting, upsertSettingValue(strings.ToLower(setting.SettingKey), setting.SettingValue, setting.Version)
})
if err != nil {
return err
}
setting.Version++
return nil
}
func upsertSettingValue(key, value string, version int) error {
return db.WithTx(db.DefaultContext, func(ctx context.Context) error {
e := db.GetEngine(ctx)
// here we use a general method to do a safe upsert for different databases (and most transaction levels)
// 1. try to UPDATE the record and acquire the transaction write lock
// if UPDATE returns non-zero rows are changed, OK, the setting is saved correctly
// if UPDATE returns "0 rows changed", two possibilities: (a) record doesn't exist (b) value is not changed
// 2. do a SELECT to check if the row exists or not (we already have the transaction lock)
// 3. if the row doesn't exist, do an INSERT (we are still protected by the transaction lock, so it's safe)
//
// to optimize the SELECT in step 2, we can use an extra column like `revision=revision+1`
// to make sure the UPDATE always returns a non-zero value for existing (unchanged) records.
res, err := e.Exec("UPDATE system_setting SET setting_value=?, version = version+1 WHERE setting_key=? AND version=?", value, key, version)
if err != nil {
return err
}
rows, _ := res.RowsAffected()
if rows > 0 {
// the existing row is updated, so we can return
return nil
}
// in case the value isn't changed, update would return 0 rows changed, so we need this check
has, err := e.Exist(&Setting{SettingKey: key})
if err != nil {
return err
}
if has {
return ErrDataExpired{Key: key}
}
// if no existing row, insert a new row
_, err = e.Insert(&Setting{SettingKey: key, SettingValue: value})
return err
})
}
var (
GravatarSourceURL *url.URL
LibravatarService *libravatar.Libravatar
)
func Init() error {
var disableGravatar bool
disableGravatarSetting, err := GetSettingNoCache(KeyPictureDisableGravatar)
if IsErrSettingIsNotExist(err) {
disableGravatar = setting.GetDefaultDisableGravatar()
disableGravatarSetting = &Setting{SettingValue: strconv.FormatBool(disableGravatar)}
} else if err != nil {
return err
} else {
disableGravatar = disableGravatarSetting.GetValueBool()
}
var enableFederatedAvatar bool
enableFederatedAvatarSetting, err := GetSettingNoCache(KeyPictureEnableFederatedAvatar)
if IsErrSettingIsNotExist(err) {
enableFederatedAvatar = setting.GetDefaultEnableFederatedAvatar(disableGravatar)
enableFederatedAvatarSetting = &Setting{SettingValue: strconv.FormatBool(enableFederatedAvatar)}
} else if err != nil {
return err
} else {
enableFederatedAvatar = disableGravatarSetting.GetValueBool()
}
if setting.OfflineMode {
disableGravatar = true
enableFederatedAvatar = false
}
if enableFederatedAvatar || !disableGravatar {
var err error
GravatarSourceURL, err = url.Parse(setting.GravatarSource)
if err != nil {
return fmt.Errorf("Failed to parse Gravatar URL(%s): %w", setting.GravatarSource, err)
}
}
if enableFederatedAvatarSetting.GetValueBool() {
LibravatarService = libravatar.New()
if GravatarSourceURL.Scheme == "https" {
LibravatarService.SetUseHTTPS(true)
LibravatarService.SetSecureFallbackHost(GravatarSourceURL.Host)
} else {
LibravatarService.SetUseHTTPS(false)
LibravatarService.SetFallbackHost(GravatarSourceURL.Host)
}
}
return nil
}