feat: setup/register flow impl and login refactor

api/pageLogin.go

@@ -0,0 +1,77 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"os"
+)
+
+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 IsLoggedIn(r) {
+			http.Redirect(w, r, "/home", http.StatusSeeOther)
+			return
+		}
+		if r.Method == http.MethodPost {
+			PostLoginPage(w, r)
+			return
+		}
+		if IsUserTableEmpty() {
+			http.Redirect(w, r, "/register", http.StatusSeeOther)
+			return
+		}
+		bs, err := Container.GetPageUseCase.GetPage("login", &loginPage)
+		if err != nil {
+			_, _ = w.Write([]byte(err.Error()))
+		}
+		_, _ = w.Write(bs)
+	}
+}
+
+func PostLoginPage(w http.ResponseWriter, r *http.Request) {
+	_ = r.ParseForm()
+
+	credentials, err := json.Marshal(&UserLogin{
+		Username: r.FormValue("username"),
+		Password: r.FormValue("password"),
+	})
+	if err != nil {
+		r.Method = http.MethodGet
+		GetLoginPageHandler(&LoginPage{
+			PageError: NewPageError("Invalid form data format."),
+			Username:  r.FormValue("username"),
+		})(w, r)
+		return
+	}
+
+	response, err := http.Post(
+		"http://localhost:"+os.Getenv("PORT")+"/v1/auth/login",
+		"application/json",
+		bytes.NewBuffer(credentials))
+
+	if err != nil || response.StatusCode != http.StatusOK {
+		r.Method = http.MethodGet
+		GetLoginPageHandler(&LoginPage{
+			PageError: NewPageError("Invalid username or password."),
+			Username:  r.FormValue("username"),
+		})(w, r)
+		return
+	}
+
+	w.Header().Set("Set-Cookie", response.Header.Get("Set-Cookie"))
+
+	http.Redirect(w, r, "/home", http.StatusSeeOther)
+}