feat: add auth middleware, and update event post to make use of it

functional-test/auth.http

@@ -16,4 +16,6 @@ content-type: application/json
 {
   "email": "test@example.com",
   "password": "examplePassword"
-}
+}
+
+> {% client.global.set("auth_token", response.body.jwt); %}

functional-test/events.http

@@ -5,6 +5,7 @@ GET http://localhost:8080/events
 ### Post a new event
 POST http://localhost:8080/events/
 content-type: application/json
+Authorization: Bearer {{auth_token}}
 
 {
   "name": "My test event",

functional-test/http-client.private.env.json

@@ -0,0 +1,6 @@
+{
+  "dev": {
+    "name": "value",
+    "auth_token": ""
+  }
+}

middleware/middleware.go

@@ -0,0 +1,49 @@
+package middleware
+
+import (
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"net/http"
+	"os"
+	"time"
+	"udemy_httpserver/models"
+)
+
+func RequireAuth(c *gin.Context) {
+	// Get JWT from cookie
+	tokenString := c.GetHeader("Authorization")
+	if tokenString == "" {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
+		c.Abort()
+		return
+	}
+	tokenString = tokenString[7:] // Remove "Bearer " from the token
+	// Decode/validate it
+	token, _ := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		// Don't forget to validate the alg is what you expect:
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
+		}
+
+		// hmacSampleSecret is a []byte containing your secret, e.g. []byte("my_secret_key")
+		return []byte(os.Getenv("JWT_SECRET")), nil
+	})
+
+	if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
+		// Check the expiry date
+		if float64(time.Now().Unix()) > claims["exp"].(float64) {
+			c.AbortWithStatus(http.StatusUnauthorized)
+		}
+		// Validate that the user exists in the database
+		user, err := models.FindOneByID(int(claims["sub"].(float64)))
+		if err != nil || user == nil {
+			c.AbortWithStatus(http.StatusUnauthorized)
+		}
+		c.Set("user", user)
+		c.Next()
+	} else {
+		c.AbortWithStatus(http.StatusUnauthorized)
+	}
+
+}

models/user.go

@@ -1,6 +1,7 @@
 package models
 
 import (
+	"database/sql"
 	"fmt"
 	"github.com/golang-jwt/jwt/v5"
 	"golang.org/x/crypto/bcrypt"
@@ -35,6 +36,28 @@ func FindOneByEmail(email string) (*User, error) {
 	selectQuery := `SELECT * FROM users WHERE email = ?`
 
 	dbResponse, err := db.Conn.Query(selectQuery, email)
+	defer closeDbConnection(dbResponse)
+	if err != nil {
+		fmt.Println("Something went wrong trying to find a user")
+		return nil, err
+	}
+	if dbResponse.Next() {
+		var user User
+		err = dbResponse.Scan(&user.ID, &user.Name, &user.Email, &user.Password)
+		if err != nil {
+			fmt.Println("Something went wrong parsing the database row")
+			return nil, err
+		}
+		return &user, nil
+	}
+	return nil, nil
+}
+
+func FindOneByID(id int) (*User, error) {
+	selectQuery := `SELECT * FROM users WHERE id =?`
+
+	dbResponse, err := db.Conn.Query(selectQuery, id)
+	defer closeDbConnection(dbResponse)
 	if err != nil {
 		fmt.Println("Something went wrong trying to find a user")
 		return nil, err
@@ -68,3 +91,9 @@ func (u *User) GetJWToken() (string, error) {
 	}
 	return tokenString, nil
 }
+func closeDbConnection(dbResponse *sql.Rows) {
+	err := dbResponse.Close()
+	if err != nil {
+		fmt.Println("Something went wrong closing the database row")
+	}
+}

routes/events.routes.go

@@ -15,7 +15,8 @@ func postEvent(c *gin.Context) {
 		return
 	}
 	// Todo: implement user auth
-	event.UserID = 0
+	user, _ := c.Get("user")
+	event.UserID = user.(*models.User).ID
 	err = event.Save()
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})

routes/routes.go

@@ -1,12 +1,15 @@
 package routes
 
-import "github.com/gin-gonic/gin"
+import (
+	"github.com/gin-gonic/gin"
+	"udemy_httpserver/middleware"
+)
 
 func RegisterRoutes(router *gin.Engine) {
-	router.POST("/events", postEvent)
+	router.POST("/events", middleware.RequireAuth, postEvent)
 	router.GET("/events", getEvents)
 	router.GET("/events/:id", getSingleEvent)
-	router.PUT("/events/:id", updateEvent)
+	router.PUT("/events/:id", middleware.RequireAuth, updateEvent)
 
 	router.POST("/auth/register", registerUser)
 	router.POST("/auth/login", Login)