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/* openbills - Server for web based Libre Billing Software
* Copyright (C) 2023 Vidhu Kant Sharma <vidhukant@vidhukant.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package auth
import (
"vidhukant.com/openbills/errors"
"github.com/gin-gonic/gin"
"github.com/golang-jwt/jwt/v5"
"strings"
"time"
)
func getBearerToken(header []string) (string, error) {
if len(header) > 0 {
s := strings.Split(header[0], "Bearer ")
if len(s) == 2 {
return s[1], nil
} else {
return "", errors.ErrInvalidAuthHeader
}
} else {
return "", errors.ErrInvalidAuthHeader
}
}
func Authorize() gin.HandlerFunc {
return func(ctx *gin.Context) {
bearerToken, err := getBearerToken(ctx.Request.Header["Authorization"])
if err != nil {
ctx.Error(err)
ctx.Abort()
return
}
tk, err := jwt.ParseWithClaims(bearerToken, &AuthClaims{}, func (token *jwt.Token) (interface{}, error) {
return []byte(AUTH_KEY), nil
})
claims, ok := tk.Claims.(*AuthClaims)
if !ok {
ctx.Error(errors.ErrInvalidAuthHeader)
ctx.Abort()
return
}
if !tk.Valid {
eat := claims.ExpiresAt.Unix()
if eat != 0 && eat < time.Now().Unix() {
ctx.Error(errors.ErrSessionExpired)
} else {
ctx.Error(errors.ErrUnauthorized)
}
ctx.Abort()
return
}
ctx.Set("UserID", claims.UserID)
ctx.Next()
}
}
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