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/*
* Copyright (C) 2017 "IoT.bzh"
* Author Sebastien Douheret <sebastien@iot.bzh>
*
* 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 xdsconfig
import (
"encoding/json"
"os"
"os/user"
"path"
"path/filepath"
"strings"
common "github.com/iotbzh/xds-common/golib"
)
const (
// ConfigDir Directory in user HOME directory where xds config will be saved
ConfigDir = ".xds-server"
// GlobalConfigFilename Global config filename
GlobalConfigFilename = "config.json"
// ServerDataFilename Server data filename
ServerDataFilename = "server-data.xml"
// FoldersConfigFilename Folders config filename
FoldersConfigFilename = "server-config_folders.xml"
)
// SyncThingConf definition
type SyncThingConf struct {
BinDir string `json:"binDir"`
Home string `json:"home"`
GuiAddress string `json:"gui-address"`
GuiAPIKey string `json:"gui-apikey"`
RescanIntervalS int `json:"rescanIntervalS"`
}
// FileConfig is the JSON structure of xds-server config file (config.json)
type FileConfig struct {
WebAppDir string `json:"webAppDir"`
ShareRootDir string `json:"shareRootDir"`
SdkRootDir string `json:"sdkRootDir"`
HTTPPort string `json:"httpPort"`
SThgConf *SyncThingConf `json:"syncthing"`
LogsDir string `json:"logsDir"`
}
// readGlobalConfig reads configuration from a config file.
// Order to determine which config file is used:
// 1/ from command line option: "--config myConfig.json"
// 2/ $HOME/.xds-server/config.json file
// 3/ /etc/xds-server/config.json file
// 4/ <xds-server executable dir>/config.json file
func readGlobalConfig(c *Config, confFile string) error {
searchIn := make([]string, 0, 3)
if confFile != "" {
searchIn = append(searchIn, confFile)
}
if usr, err := user.Current(); err == nil {
searchIn = append(searchIn, path.Join(usr.HomeDir, ConfigDir,
GlobalConfigFilename))
}
searchIn = append(searchIn, "/etc/xds-server/config.json")
exePath := os.Args[0]
ee, _ := os.Executable()
exeAbsPath, err := filepath.Abs(ee)
if err == nil {
exePath, err = filepath.EvalSymlinks(exeAbsPath)
if err == nil {
exePath = filepath.Dir(ee)
} else {
exePath = filepath.Dir(exeAbsPath)
}
}
searchIn = append(searchIn, path.Join(exePath, "config.json"))
var cFile *string
for _, p := range searchIn {
if _, err := os.Stat(p); err == nil {
cFile = &p
break
}
}
if cFile == nil {
// No config file found
return nil
}
c.Log.Infof("Use config file: %s", *cFile)
// TODO move on viper package to support comments in JSON and also
// bind with flags (command line options)
// see https://github.com/spf13/viper#working-with-flags
fd, _ := os.Open(*cFile)
defer fd.Close()
fCfg := FileConfig{}
if err := json.NewDecoder(fd).Decode(&fCfg); err != nil {
return err
}
// Support environment variables (IOW ${MY_ENV_VAR} syntax) in config.json
vars := []*string{
&fCfg.WebAppDir,
&fCfg.ShareRootDir,
&fCfg.SdkRootDir,
&fCfg.LogsDir}
if fCfg.SThgConf != nil {
vars = append(vars, &fCfg.SThgConf.Home, &fCfg.SThgConf.BinDir)
}
for _, field := range vars {
var err error
if *field, err = common.ResolveEnvVar(*field); err != nil {
return err
}
}
// Use config file settings else use default config
if fCfg.WebAppDir == "" {
fCfg.WebAppDir = c.FileConf.WebAppDir
}
if fCfg.ShareRootDir == "" {
fCfg.ShareRootDir = c.FileConf.ShareRootDir
}
if fCfg.SdkRootDir == "" {
fCfg.SdkRootDir = c.FileConf.SdkRootDir
}
if fCfg.HTTPPort == "" {
fCfg.HTTPPort = c.FileConf.HTTPPort
}
if fCfg.LogsDir == "" {
fCfg.LogsDir = c.FileConf.LogsDir
}
// Resolve webapp dir (support relative or full path)
fCfg.WebAppDir = strings.Trim(fCfg.WebAppDir, " ")
if !strings.HasPrefix(fCfg.WebAppDir, "/") && exePath != "" {
cwd, _ := os.Getwd()
// Check first from current directory
for _, rootD := range []string{exePath, cwd} {
ff := path.Join(rootD, fCfg.WebAppDir, "index.html")
if common.Exists(ff) {
fCfg.WebAppDir = path.Join(rootD, fCfg.WebAppDir)
break
}
}
}
c.FileConf = fCfg
return nil
}
func configFilenameGet(cfgFile string) (string, error) {
usr, err := user.Current()
if err != nil {
return "", err
}
return path.Join(usr.HomeDir, ConfigDir, cfgFile), nil
}
// FoldersConfigFilenameGet
func FoldersConfigFilenameGet() (string, error) {
return configFilenameGet(FoldersConfigFilename)
}
// ServerDataFilenameGet
func ServerDataFilenameGet() (string, error) {
return configFilenameGet(ServerDataFilename)
}
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