/
utility.go
119 lines (103 loc) · 2.49 KB
/
utility.go
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package utility
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"image"
"image/png"
"net/http"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/Zhang-Yu-Bo/friendly-pancake/model/logger"
)
func IsFileOrDirExist(path string) bool {
_, err := os.Stat(path)
// 好像不太能用 os.IsExist(err) ...在判斷上會出現問題 = =
// 當路徑存在時, os.IsExist(err)跟 os.IsNotExist(err)同時判定為 false
// 當路徑不存在時 os.IsExist(err) == false, os.IsNotExist(err) == true
// 所以這邊先用 !os.IsNotExist(err)判斷
return !os.IsNotExist(err)
}
func CreateFile(fileName string) (*os.File, error) {
path := filepath.Dir(fileName)
if IsFileOrDirExist(path) {
// if file path exist
return os.Create(fileName)
}
// if file path not exist
if err := os.MkdirAll(path, os.ModePerm); err != nil {
return nil, err
}
return os.Create(fileName)
}
func HashBySha256(val string) string {
hashVal := sha256.Sum256([]byte(val))
return hex.EncodeToString(hashVal[:])
}
func Clamp(val, min, max int) int {
if val < min {
val = min
}
if val > max {
val = max
}
return val
}
func GetStringFromURL(r *http.Request, key string, defaultVal string) string {
val := r.URL.Query().Get(key)
if val == "" && defaultVal != "" {
val = defaultVal
}
return val
}
func PixelToInt(val string) int {
valInt, err := strconv.Atoi(strings.ReplaceAll(val, "px", ""))
if err != nil {
valInt = 0
fmt.Printf("%s\n", err.Error())
}
return valInt
}
func OpenPngAsByte(filePath string) ([]byte, error) {
if !IsFileOrDirExist(filePath) {
return nil, errors.New(filePath + " does not exist.")
}
return os.ReadFile(filePath)
}
func SaveBytesAsPng(filePath string, data []byte) error {
var err error
var imgFile *os.File
var mImg image.Image
var fileInDir []string
if fileInDir, err = filepath.Glob(filepath.Dir(filePath) + "/*.*"); err != nil {
return err
}
if len(fileInDir) >= MaxLocalCatchOfImg {
if err = os.RemoveAll(filepath.Dir(filePath)); err != nil {
return err
}
logger.LogMessage("delete file at: " + filepath.Dir(filePath))
}
if imgFile, err = CreateFile(filePath); err != nil {
return err
}
defer CloseFile(imgFile)
if mImg, err = png.Decode(bytes.NewReader(data)); err != nil {
return err
}
if err = png.Encode(imgFile, mImg); err != nil {
return err
}
return nil
}
func CloseFile(mFile *os.File) {
if err := mFile.Close(); err != nil {
logger.ErrorMessage(err)
} else {
logger.LogMessage(mFile.Name() + " is closed.")
}
}