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utils.go
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utils.go
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package utils
import (
"crypto/rand"
"fmt"
"log"
"os"
"path/filepath"
"regexp"
"github.com/mitchellh/go-homedir"
"github.com/xenolf/lego/platform/config/env"
)
func CreateCacheDir() string {
cacheDir := env.GetOrDefaultString("CALAOSDNS_CACHE_DIR", "")
if cacheDir == "" {
cacheDir, _ = homedir.Dir()
cacheDir = cacheDir + "/.cache/calaos/ddns"
}
CreateDir(cacheDir, 0700)
return cacheDir
}
func CreateDir(cacheDir string, cacheperm os.FileMode) {
_, err := os.Stat(cacheDir)
if err != nil {
err = os.MkdirAll(cacheDir, cacheperm)
if err != nil {
fmt.Println("Failed to create cache dir.")
}
}
}
func TokenGenerator() string {
b := make([]byte, 8)
rand.Read(b)
return fmt.Sprintf("%x", b)
}
func IsValidHostname(host string) (string, bool) {
valid, _ := regexp.Match("^[a-z0-9]{4,32}$", []byte(host))
return host, valid
}
func IsValidSubHostname(host string) (string, bool) {
valid, _ := regexp.Match("^[a-z0-9]{3,32}$", []byte(host))
return host, valid
}
func StringInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}
var (
globalLogger *log.Logger
logFile *os.File
)
func InitLogger() (*log.Logger, *os.File, error) {
if globalLogger == nil {
l, err := os.OpenFile(filepath.Join(CreateCacheDir(), "calaos_ddns.log"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
if err != nil {
return nil, nil, fmt.Errorf("[FATAL] failed to create logfile: %v", err)
}
logFile = l
log.SetOutput(logFile)
globalLogger = log.New(logFile, "", log.LstdFlags)
}
return globalLogger, logFile, nil
}