Reorganize project structure and fix SQLite usage

internal/auth/auth.go

@@ -0,0 +1,78 @@
+package auth
+
+import (
+	_ "embed"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+//go:embed  login.html
+var loginPage string
+
+//go:embed wrongPassword.html
+var wrongPassword string
+
+type Authenticator struct {
+	sessions map[string]token
+}
+
+func New() *Authenticator {
+	return &Authenticator{sessions: make(map[string]token)}
+}
+
+func (a *Authenticator) login(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		w.Header().Set("content-type", "text/html")
+		fmt.Fprint(w, loginPage)
+		return
+	}
+	err := r.ParseForm()
+	if err != nil {
+		w.Header().Set("content-type", "text/html")
+		fmt.Fprint(w, loginPage)
+		return
+	}
+	login := r.PostFormValue("login")
+	password := r.PostFormValue("password")
+	if login != "admin" || password != "secret" {
+		w.Header().Set("content-type", "text/html")
+		fmt.Fprint(w, wrongPassword)
+		return
+	}
+	key := generateKey()
+	a.sessions[key] = token{userName: login, created: time.Now(), lastAccess: time.Now()}
+	c := http.Cookie{
+		Name:     "token",
+		Value:    key,
+		HttpOnly: true,
+		// #todo (in prod) uncomment this line
+		//Secure: true,
+		SameSite: http.SameSiteStrictMode,
+		Path:     "/",
+	}
+	http.SetCookie(w, &c)
+	http.Redirect(w, r, "/", http.StatusFound)
+}
+
+func (a *Authenticator) Middleware(in http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.String() == "/login" {
+			a.login(w, r)
+			return
+		}
+		c, err := r.Cookie("token")
+		if err != nil {
+			http.Redirect(w, r, "/login", http.StatusSeeOther)
+			return
+		}
+		value, ok := a.sessions[c.Value]
+		if !ok || time.Since(value.lastAccess) > time.Hour*24 || time.Since(value.lastAccess) > time.Hour*240 {
+			http.Redirect(w, r, "/login", http.StatusSeeOther)
+			return
+		}
+		value.lastAccess = time.Now()
+		a.sessions[c.Value] = value
+		in.ServeHTTP(w, r)
+	})
+}

internal/auth/login.html

@@ -0,0 +1,12 @@
+<header>
+    <h1>Login</h1>
+</header>
+<main>
+    <form method="post">
+        <label>Login</label>
+        <input type="text" name="login" />
+        <label>Password</label>
+        <input type="password" name="password" />
+        <button type="submit">login</button>
+    </form>
+</main>

internal/auth/token.go

@@ -0,0 +1,19 @@
+package auth
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"time"
+)
+
+type token struct {
+	userName   string
+	created    time.Time
+	lastAccess time.Time
+}
+
+func generateKey() string {
+	key := [32]byte{}
+	rand.Read(key[:])
+	return base64.StdEncoding.EncodeToString(key[:])
+}

internal/auth/wrongPassword.html

@@ -0,0 +1,12 @@
+<header>
+    <h1>Wrong Password</h1>
+</header>
+<main>
+    <form method="post">
+        <label>Login</label>
+        <input type="text" name="login" />
+        <label>Password</label>
+        <input type="password" name="password" />
+        <button type="submit">login</button>
+    </form>
+</main>