add logout

static/assets/icons/logout.svg

@@ -0,0 +1,11 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="currentColor"
+>
+  <path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/>
+  <polyline points="16 17 21 12 16 7"/>
+  <line x1="21" y1="12" x2="9" y2="12"/>
+</svg>

templates/base.gohtml

@@ -31,6 +31,10 @@
             <img src="/files/assets/icons/user.svg" class="menu-icon" alt="Profile">
             <span>My Profile</span>
           </a>
+          <a href="/logout" class="menu-item">
+            <img src="/files/assets/icons/logout.svg" class="menu-icon" alt="Logout">
+            <span>Logout</span>
+          </a>
           {{else}}
           <a href="/login" class="menu-item">
             <img src="/files/assets/icons/user.svg" class="menu-icon" alt="Login">

web/session.go

@@ -76,3 +76,19 @@ func getUserIdByUsername(ctx context.Context, username string) (int, error) {
 		Scan(&userId)
 	return userId, err
 }
+
+func logoutHandler() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		cookie, err := r.Cookie("session")
+		if err == nil {
+			deleteSession(cookie.Value)
+		}
+		http.SetCookie(w, &http.Cookie{
+			Name:   "session",
+			Value:  "",
+			Path:   "/",
+			MaxAge: -1,
+		})
+		http.Redirect(w, r, "/login", http.StatusSeeOther)
+	}
+}

web/web.go

@@ -88,6 +88,7 @@ func Start() {
 	r.Handle("/files/*", http.StripPrefix("/files", http.FileServer(http.Dir("./static"))))
 	r.Get("/", rootHandler())
 	r.Get("/login", loginPageHandler())
+	r.Get("/logout", logoutHandler())
 	r.Get("/createaccount", createAccountPageHandler())
 	r.Get("/profile/{username}", profilePageHandler())
 	r.Get("/profile/{username}/artist/{artist}", artistPageHandler())