feat: add frontend + backend + database to retrieve and compute news from Yahoo

backend/internal/auth/jwt.go

@@ -0,0 +1,46 @@
+package auth
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type Claims struct {
+	UserID string `json:"user_id"`
+	Email  string `json:"email"`
+	Role   string `json:"role"`
+	jwt.RegisteredClaims
+}
+
+func GenerateToken(userID, email, role, secret string) (string, error) {
+	claims := Claims{
+		UserID: userID,
+		Email:  email,
+		Role:   role,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(secret))
+}
+
+func ValidateToken(tokenStr, secret string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(t *jwt.Token) (interface{}, error) {
+		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("unexpected signing method")
+		}
+		return []byte(secret), nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, fmt.Errorf("invalid token")
+	}
+	return claims, nil
+}

backend/internal/auth/middleware.go

@@ -0,0 +1,37 @@
+package auth
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+func Middleware(secret string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		header := c.GetHeader("Authorization")
+		if !strings.HasPrefix(header, "Bearer ") {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "missing token"})
+			return
+		}
+		claims, err := ValidateToken(strings.TrimPrefix(header, "Bearer "), secret)
+		if err != nil {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
+			return
+		}
+		c.Set("userID", claims.UserID)
+		c.Set("email", claims.Email)
+		c.Set("role", claims.Role)
+		c.Next()
+	}
+}
+
+func AdminOnly() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if c.GetString("role") != "admin" {
+			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "admin only"})
+			return
+		}
+		c.Next()
+	}
+}

backend/internal/auth/passwords.go

@@ -0,0 +1,12 @@
+package auth
+
+import "golang.org/x/crypto/bcrypt"
+
+func HashPassword(password string) (string, error) {
+	b, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	return string(b), err
+}
+
+func CheckPassword(hash, password string) bool {
+	return bcrypt.CompareHashAndPassword([]byte(hash), []byte(password)) == nil
+}