added basic token refreshing

1 files changed, 182 insertions, 0 deletions

diff --git a/auth/:w b/auth/:w
new file mode 100644
index 0000000..7e3346e
--- /dev/null
+++ b/auth/:w
@@ -0,0 +1,182 @@
+/* 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 (
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/spf13/viper"
+	"golang.org/x/crypto/bcrypt"
+	"vidhukant.com/openbills/user"
+	"net/http"
+	"time"
+	"vidhukant.com/openbills/errors"
+)
+
+var (
+	COST int
+	AUTH_KEY, REFRESH_KEY []byte
+)
+func init() {
+	COST = viper.GetInt("cryptography.password_hashing_cost")
+	AUTH_KEY = []byte(viper.GetString("cryptography.auth_key"))
+	REFRESH_KEY = []byte(viper.GetString("cryptography.refresh_key"))
+}
+
+func handleSignUp (ctx *gin.Context) {
+	var user user.User
+	ctx.Bind(&user)
+
+	var err error
+
+	// hash password
+	var bytes []byte
+	bytes, err = bcrypt.GenerateFromPassword([]byte(user.Password), 14)
+	if err != nil {
+		// TODO: handle potential errors
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+	user.Password = string(bytes)
+
+	err = user.Create()
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	// remove password hash from response
+	user.Password = ""
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": user,
+	})
+}
+
+func handleSignIn (ctx *gin.Context) {
+	var req LoginReq
+	ctx.Bind(&req)
+
+	var err error
+	var u user.User
+
+	err = user.CheckPassword(&u, req.AccountName, req.Method, req.Password)
+	if err != nil {
+		// TODO: handle potential errors
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	authToken, err := jwt.NewWithClaims(jwt.SigningMethodHS256,
+		AuthClaims {
+			jwt.RegisteredClaims {
+				IssuedAt: jwt.NewNumericDate(time.Now()),
+				ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Minute * 2)),
+			},
+			u.ID,
+		},
+	).SignedString(AUTH_KEY)
+	if err != nil {
+		// TODO: handle potential errors
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	refreshToken, err := jwt.NewWithClaims(jwt.SigningMethodHS256,
+		AuthClaims {
+			jwt.RegisteredClaims {
+				IssuedAt: jwt.NewNumericDate(time.Now()),
+			  ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour * 6)),
+			},
+			u.ID,
+		},
+	).SignedString(REFRESH_KEY)
+	if err != nil {
+		// TODO: handle potential errors
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	// remove password hash from response
+	u.Password = ""
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"auth_token": authToken,
+		"refresh_token": refreshToken,
+		"message": "success",
+		"data": u,
+	})
+}
+
+func handleRefresh (ctx *gin.Context) {
+	var req RefreshReq
+	ctx.Bind(&req)
+
+	tk, _ := jwt.ParseWithClaims(req.RefreshToken, &AuthClaims{}, func (token *jwt.Token) (interface{}, error) {
+		return []byte(REFRESH_KEY), nil
+	})
+
+	claims, ok := tk.Claims.(*AuthClaims)
+	if !ok {
+		ctx.Error(errors.ErrUnauthorized)
+		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
+	}
+
+	// TODO: if token is valid, check if user even exists before generating authToken
+
+	authToken, err := jwt.NewWithClaims(jwt.SigningMethodHS256,
+		AuthClaims {
+			jwt.RegisteredClaims {
+				IssuedAt: jwt.NewNumericDate(time.Now()),
+				ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Minute * 2)),
+			},
+			claims.UserID,
+		},
+	).SignedString(AUTH_KEY)
+	if err != nil {
+		// TODO: handle potential errors
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"auth_token": authToken,
+		"message": "success",
+		//"data": u,
+	})
+}