feat: first frontend implementation

api/page.go

@@ -0,0 +1,93 @@
+package api
+
+import (
+	"GohCMS2/adapters/secondary"
+	"bytes"
+	"encoding/json"
+	"github.com/go-chi/chi/v5"
+	"net/http"
+	"strings"
+)
+
+type LoginPage struct {
+	IsError bool   `json:"isError"`
+	Error   string `json:"error"`
+}
+
+func getPage(page string, data interface{}) ([]byte, error) {
+	template := secondary.GetTemplate(page)
+	processed, err := secondary.ProcessTemplate(template, data)
+	if err != nil {
+		return nil, err
+	}
+	return processed, nil
+}
+
+func getLoginPageHandler(errMsg string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		bs, err := getPage("login", &LoginPage{
+			IsError: strings.Compare(errMsg, "") != 0,
+			Error:   errMsg,
+		})
+		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 {
+		getLoginPageHandler("Missing username or password.")(w, r)
+		return
+	}
+
+	// TODO replace url with som env variable
+	response, err := http.Post("http://localhost:8080/v1/auth/login", "application/json", bytes.NewBuffer(credentials))
+	// TODO handle possible errors in separate file (api package)
+	if err != nil || response.StatusCode != http.StatusOK {
+		getLoginPageHandler("Invalid username or password.")(w, r)
+		return
+	}
+
+	w.Header().Set("Set-Cookie", response.Header.Get("Set-Cookie"))
+
+	http.Redirect(w, r, "/home", http.StatusFound)
+}
+
+func getHomePage(w http.ResponseWriter, _ *http.Request) {
+	bs, err := getPage("home", nil)
+	if err != nil {
+		_, _ = w.Write([]byte(err.Error()))
+	}
+	_, _ = w.Write(bs)
+}
+
+func IsLoggedInMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if !IsLoggedIn(r) {
+			http.Redirect(w, r, "/login", http.StatusFound)
+			return
+		}
+		next.ServeHTTP(w, r)
+	})
+}
+
+func NewPageRouter() http.Handler {
+	r := chi.NewRouter()
+	r.Get("/login", getLoginPageHandler(""))
+	r.Post("/login", postLoginPage)
+
+	r.Group(func(r chi.Router) {
+		r.Use(IsLoggedInMiddleware)
+		r.Get("/home", getHomePage)
+	})
+
+	return r
+}