From 1e45ae2ea3497958b2ea6a20137955cfc3bbc964 Mon Sep 17 00:00:00 2001
From: "Gabriel A. Giovanini" <mail@gabrielgio.me>
Date: Wed, 11 Dec 2024 17:05:12 +0100
Subject: feat: Add UI/Handler login process

It adds the whole workflow to store and handle login on both UI and
handler level. With that the login information should be available at
any point given the context.
---
 pkg/handler/auth/login.go | 75 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 71 insertions(+), 4 deletions(-)

(limited to 'pkg/handler/auth/login.go')

diff --git a/pkg/handler/auth/login.go b/pkg/handler/auth/login.go
index 7e77a67..7014548 100644
--- a/pkg/handler/auth/login.go
+++ b/pkg/handler/auth/login.go
@@ -1,20 +1,87 @@
 package auth
 
 import (
+	"encoding/base64"
 	"net/http"
+	"time"
 
 	"git.gabrielgio.me/cerrado/pkg/ext"
 	"git.gabrielgio.me/cerrado/templates"
 )
 
 type (
-	LoginHandler struct{}
+	LoginHandler struct {
+		auth authService
+	}
+
+	authService interface {
+		CheckAuth(username, password string) bool
+		IssueToken() ([]byte, error)
+	}
 )
 
+func NewLoginHandler(auth authService) *LoginHandler {
+	return &LoginHandler{
+		auth: auth,
+	}
+}
+
+func (g *LoginHandler) Logout(w http.ResponseWriter, r *http.Request) error {
+	cookie := &http.Cookie{
+		Name:    "auth",
+		Value:   "",
+		Path:    "/",
+		Expires: time.Unix(0, 0),
+	}
+
+	referer := r.Header.Get("Referer")
+	if referer == "" {
+		referer = "/"
+	}
+
+	http.SetCookie(w, cookie)
+	ext.Redirect(w, referer)
+	return nil
+}
+
 func (g *LoginHandler) Login(w http.ResponseWriter, r *http.Request) error {
-	ext.SetHTML(w)
+	if r.Method == "GET" {
+		ext.SetHTML(w)
+
+		login := &templates.LoginPage{}
+		templates.WritePageTemplate(w, login, r.Context())
+	} else if r.Method == "POST" {
+
+		username := r.FormValue("username")
+		password := r.FormValue("password")
+
+		if !g.auth.CheckAuth(username, password) {
+			login := &templates.LoginPage{
+				ErrorMessage: "Invalid login",
+			}
+			templates.WritePageTemplate(w, login, r.Context())
+		} else {
+
+			bytes, err := g.auth.IssueToken()
+			if err != nil {
+				return err
+			}
+
+			cookie := &http.Cookie{
+				Name:     "auth",
+				Value:    base64.StdEncoding.EncodeToString(bytes),
+				Path:     "/",
+				MaxAge:   3600,
+				HttpOnly: true,
+				Secure:   true,
+				SameSite: http.SameSiteStrictMode,
+			}
+
+			http.SetCookie(w, cookie)
+			ext.Redirect(w, "/")
+		}
+
+	}
 
-	login := &templates.LoginPage{}
-	templates.WritePageTemplate(w, login)
 	return nil
 }
-- 
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