added login and test admin page

utils/token/token.go

@@ -0,0 +1,79 @@
+package token
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	jwt "github.com/dgrijalva/jwt-go"
+	"github.com/gin-gonic/gin"
+)
+
+func GenerateToken(user_id uint) (string, error) {
+
+	token_lifespan, err := strconv.Atoi(os.Getenv("TOKEN_HOUR_LIFESPAN"))
+	if err != nil {
+		fmt.Printf("GenerateToken Error getting env value TOKEN_HOUR_LIFESPAN\n")
+		return "", err
+	}
+
+	claims := jwt.MapClaims{}
+	claims["authorized"] = true
+	claims["user_id"] = user_id
+	claims["exp"] = time.Now().Add(time.Hour * time.Duration(token_lifespan)).Unix()
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+
+	return token.SignedString([]byte(os.Getenv("API_SECRET")))
+
+}
+
+func TokenValid(c *gin.Context) error {
+	tokenString := ExtractToken(c)
+	_, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
+		}
+		return []byte(os.Getenv("API_SECRET")), nil
+	})
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func ExtractToken(c *gin.Context) string {
+	token := c.Query("token")
+	if token != "" {
+		return token
+	}
+	bearerToken := c.Request.Header.Get("Authorization")
+	if len(strings.Split(bearerToken, " ")) == 2 {
+		return strings.Split(bearerToken, " ")[1]
+	}
+	return ""
+}
+
+func ExtractTokenID(c *gin.Context) (uint, error) {
+
+	tokenString := ExtractToken(c)
+	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
+		}
+		return []byte(os.Getenv("API_SECRET")), nil
+	})
+	if err != nil {
+		return 0, err
+	}
+	claims, ok := token.Claims.(jwt.MapClaims)
+	if ok && token.Valid {
+		uid, err := strconv.ParseUint(fmt.Sprintf("%.0f", claims["user_id"]), 10, 32)
+		if err != nil {
+			return 0, err
+		}
+		return uint(uid), nil
+	}
+	return 0, nil
+}