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util.go
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/
util.go
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package web
import (
"context"
"crypto/rand"
"crypto/subtle"
"encoding/base64"
"errors"
"fmt"
"github.com/go-playground/validator/v10"
"github.com/gorilla/sessions"
"github.com/labstack/echo/v4"
"golang.org/x/crypto/argon2"
"html/template"
"net/http"
"opengist/internal/models"
"strconv"
"strings"
)
func setData(ctx echo.Context, key string, value any) {
data := ctx.Request().Context().Value("data").(echo.Map)
data[key] = value
ctxValue := context.WithValue(ctx.Request().Context(), "data", data)
ctx.SetRequest(ctx.Request().WithContext(ctxValue))
}
func getData(ctx echo.Context, key string) any {
data := ctx.Request().Context().Value("data").(echo.Map)
return data[key]
}
func html(ctx echo.Context, template string) error {
return htmlWithCode(ctx, 200, template)
}
func htmlWithCode(ctx echo.Context, code int, template string) error {
setErrorFlashes(ctx)
return ctx.Render(code, template, ctx.Request().Context().Value("data"))
}
func redirect(ctx echo.Context, location string) error {
return ctx.Redirect(302, location)
}
func plainText(ctx echo.Context, code int, message string) error {
return ctx.String(code, message)
}
func notFound(message string) error {
return errorRes(404, message, nil)
}
func errorRes(code int, message string, err error) error {
return &echo.HTTPError{Code: code, Message: message, Internal: err}
}
func getUserLogged(ctx echo.Context) *models.User {
user := getData(ctx, "userLogged")
if user != nil {
return user.(*models.User)
}
return nil
}
func setErrorFlashes(ctx echo.Context) {
sess, _ := store.Get(ctx.Request(), "flash")
setData(ctx, "flashErrors", sess.Flashes("error"))
setData(ctx, "flashSuccess", sess.Flashes("success"))
_ = sess.Save(ctx.Request(), ctx.Response())
}
func addFlash(ctx echo.Context, flashMessage string, flashType string) {
sess, _ := store.Get(ctx.Request(), "flash")
sess.AddFlash(flashMessage, flashType)
_ = sess.Save(ctx.Request(), ctx.Response())
}
func getSession(ctx echo.Context) *sessions.Session {
sess, _ := store.Get(ctx.Request(), "session")
return sess
}
func saveSession(sess *sessions.Session, ctx echo.Context) {
_ = sess.Save(ctx.Request(), ctx.Response())
}
func deleteSession(ctx echo.Context) {
sess := getSession(ctx)
sess.Options.MaxAge = -1
sess.Values["user"] = nil
saveSession(sess, ctx)
}
func setCsrfHtmlForm(ctx echo.Context) {
if csrfToken, ok := ctx.Get("csrf").(string); ok {
setData(ctx, "csrfHtml", template.HTML(`<input type="hidden" name="_csrf" value="`+csrfToken+`">`))
}
}
func deleteCsrfCookie(ctx echo.Context) {
ctx.SetCookie(&http.Cookie{Name: "_csrf", Path: "/", MaxAge: -1})
}
type OpengistValidator struct {
v *validator.Validate
}
func NewValidator() *OpengistValidator {
v := validator.New()
_ = v.RegisterValidation("notreserved", validateReservedKeywords)
return &OpengistValidator{v}
}
func (cv *OpengistValidator) Validate(i interface{}) error {
if err := cv.v.Struct(i); err != nil {
return err
}
return nil
}
func validationMessages(err *error) string {
errs := (*err).(validator.ValidationErrors)
messages := make([]string, len(errs))
for i, e := range errs {
switch e.Tag() {
case "max":
messages[i] = e.Field() + " is too long"
case "required":
messages[i] = e.Field() + " should not be empty"
case "excludes":
messages[i] = e.Field() + " should not include a sub directory"
case "alphanum":
messages[i] = e.Field() + " should only contain alphanumeric characters"
case "min":
messages[i] = "Not enough " + e.Field()
case "notreserved":
messages[i] = "Invalid " + e.Field()
}
}
return strings.Join(messages, " ; ")
}
func validateReservedKeywords(fl validator.FieldLevel) bool {
name := fl.Field().String()
restrictedNames := map[string]struct{}{}
for _, restrictedName := range []string{"assets", "register", "login", "logout", "config", "admin-panel", "all"} {
restrictedNames[restrictedName] = struct{}{}
}
// if the name is not in the restricted names, it is valid
_, ok := restrictedNames[name]
return !ok
}
func getPage(ctx echo.Context) int {
page := ctx.QueryParam("page")
if page == "" {
page = "1"
}
pageInt, err := strconv.Atoi(page)
if err != nil {
pageInt = 1
}
setData(ctx, "currPage", pageInt)
return pageInt
}
func paginate[T any](ctx echo.Context, data []*T, pageInt int, perPage int, templateDataName string, urlPage string, labels int, urlParams ...string) error {
lenData := len(data)
if lenData == 0 && pageInt != 1 {
return errors.New("page not found")
}
if lenData > perPage {
if lenData > 1 {
data = data[:lenData-1]
}
setData(ctx, "nextPage", pageInt+1)
}
if pageInt > 1 {
setData(ctx, "prevPage", pageInt-1)
}
if len(urlParams) > 0 {
setData(ctx, "urlParams", template.URL(urlParams[0]))
}
switch labels {
case 1:
setData(ctx, "prevLabel", "Previous")
setData(ctx, "nextLabel", "Next")
case 2:
setData(ctx, "prevLabel", "Newer")
setData(ctx, "nextLabel", "Older")
}
setData(ctx, "urlPage", urlPage)
setData(ctx, templateDataName, data)
return nil
}
type Argon2ID struct {
format string
version int
time uint32
memory uint32
keyLen uint32
saltLen uint32
threads uint8
}
var argon2id = Argon2ID{
format: "$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
version: argon2.Version,
time: 1,
memory: 64 * 1024,
keyLen: 32,
saltLen: 16,
threads: 4,
}
func (a Argon2ID) hash(plain string) (string, error) {
salt := make([]byte, a.saltLen)
if _, err := rand.Read(salt); err != nil {
return "", err
}
hash := argon2.IDKey([]byte(plain), salt, a.time, a.memory, a.threads, a.keyLen)
return fmt.Sprintf(a.format, a.version, a.memory, a.time, a.threads,
base64.RawStdEncoding.EncodeToString(salt),
base64.RawStdEncoding.EncodeToString(hash),
), nil
}
func (a Argon2ID) verify(plain, hash string) (bool, error) {
hashParts := strings.Split(hash, "$")
_, err := fmt.Sscanf(hashParts[3], "m=%d,t=%d,p=%d", &a.memory, &a.time, &a.threads)
if err != nil {
return false, err
}
salt, err := base64.RawStdEncoding.DecodeString(hashParts[4])
if err != nil {
return false, err
}
decodedHash, err := base64.RawStdEncoding.DecodeString(hashParts[5])
if err != nil {
return false, err
}
hashToCompare := argon2.IDKey([]byte(plain), salt, a.time, a.memory, a.threads, uint32(len(decodedHash)))
return subtle.ConstantTimeCompare(decodedHash, hashToCompare) == 1, nil
}