build and ready for demo

login screen

internal/service/demo_auth.go

@@ -0,0 +1,76 @@
+package service
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"strings"
+	"sync"
+)
+
+type DemoUser struct {
+	Username string `json:"username"`
+	Name     string `json:"name"`
+	Password string `json:"-"`
+}
+
+type DemoAuth struct {
+	mu       sync.RWMutex
+	users    []DemoUser
+	sessions map[string]string
+}
+
+func NewDemoAuth() *DemoAuth {
+	return &DemoAuth{
+		users: []DemoUser{
+			{Username: "urpi", Name: "Urpi"},
+			{Username: "tux", Name: "Tux"},
+			{Username: "gopher", Name: "Gopher"},
+		},
+		sessions: map[string]string{},
+	}
+}
+
+func (a *DemoAuth) Users() []DemoUser {
+	a.mu.RLock()
+	defer a.mu.RUnlock()
+	out := make([]DemoUser, len(a.users))
+	copy(out, a.users)
+	for i := range out {
+		out[i].Password = ""
+	}
+	return out
+}
+
+func (a *DemoAuth) Login(username, password string) (string, DemoUser, error) {
+	username = strings.ToLower(strings.TrimSpace(username))
+	a.mu.RLock()
+	var user DemoUser
+	for _, candidate := range a.users {
+		if candidate.Username == username {
+			user = candidate
+			break
+		}
+	}
+	a.mu.RUnlock()
+	if user.Username == "" || password != username {
+		return "", DemoUser{}, errors.New("invalid demo credentials")
+	}
+	raw := make([]byte, 24)
+	if _, err := rand.Read(raw); err != nil {
+		return "", DemoUser{}, err
+	}
+	token := hex.EncodeToString(raw)
+	a.mu.Lock()
+	a.sessions[token] = user.Username
+	a.mu.Unlock()
+	user.Password = ""
+	return token, user, nil
+}
+
+func (a *DemoAuth) Authenticated(token string) (string, bool) {
+	a.mu.RLock()
+	defer a.mu.RUnlock()
+	username, ok := a.sessions[strings.TrimSpace(token)]
+	return username, ok
+}