refac: separated api content into sub-packages & renamed usecases

api/controllers/pages/login.go

@@ -0,0 +1,79 @@
+package pages
+
+import (
+	"GoCMS/api"
+	"GoCMS/api/controllers/auth"
+	"net/http"
+	"net/url"
+)
+
+const LoginRoute = "/login"
+
+type LoginPage struct {
+	PageError *PageError `json:"error"`
+	Username  string     `json:"username"`
+}
+
+var EmptyLoginPage = &LoginPage{
+	PageError: NewPageError(""),
+	Username:  "",
+}
+
+func GetLoginPageHandler(loginPage *LoginPage) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if auth.IsLoggedIn(r) {
+			http.Redirect(w, r, "/home", http.StatusSeeOther)
+			return
+		}
+		if r.Method == http.MethodPost {
+			PostLoginPage(w, r)
+			return
+		}
+		if auth.IsUserTableEmpty() {
+			http.Redirect(w, r, "/register", http.StatusSeeOther)
+			return
+		}
+		success, _ := url.QueryUnescape(r.URL.Query().Get("success"))
+		failure, _ := url.QueryUnescape(r.URL.Query().Get("failure"))
+		bs, _ := api.Container.GetPageUseCase.GetPage("login", map[string]interface{}{
+			"PageError": loginPage.PageError,
+			"Username":  loginPage.Username,
+			"Head":      headTmpl,
+			"Success":   success,
+			"Failure":   failure,
+		})
+		_, _ = w.Write(bs)
+	}
+}
+
+func PostLoginPage(w http.ResponseWriter, r *http.Request) {
+	_ = r.ParseForm()
+
+	credentials := auth.LoginCredentials{
+		Username: r.FormValue("username"),
+		Password: r.FormValue("password"),
+	}
+	err := api.Validate.Struct(credentials)
+	if err != nil {
+		r.Method = http.MethodGet
+		GetLoginPageHandler(&LoginPage{
+			PageError: NewPageError("Invalid username or password format."),
+			Username:  r.FormValue("username"),
+		})(w, r)
+		return
+	}
+
+	dbUser, err := auth.GetUserFromCredentials(credentials)
+	if err != nil {
+		r.Method = http.MethodGet
+		GetLoginPageHandler(&LoginPage{
+			PageError: NewPageError("Invalid username or password combination."),
+			Username:  r.FormValue("username"),
+		})(w, r)
+		return
+	}
+
+	_ = auth.SetJwtCookie(&w, dbUser.ID)
+
+	http.Redirect(w, r, "/home", http.StatusSeeOther)
+}