Authentication
Authالمصادقة (Authentication)
GLS-000166
Definition
Verifying that a user is who they claim to be — the 'who are you?' step before granting access.
التحقق من أن المستخدم هو من يدّعي أنه — خطوة 'من أنت؟' قبل منح الوصول.
Why It Matters
Without authentication, anyone could access private content, bookmarks, notes, and admin features. Every protected feature on 404Fault — learning progress, bookmarks, the admin panel — requires a verified identity first.
بدون المصادقة، يمكن لأي شخص الوصول إلى المحتوى الخاص والإشارات المرجعية والملاحظات وميزات الأدمن. كل ميزة محمية في 404Fault — تقدم التعلم والإشارات المرجعية ولوحة الأدمن — تتطلب هوية مُتحقَّق منها أولاً.
Full Definition
Example Usage
“Firebase Authentication's onAuthStateChanged() listens for sign-in state changes and keeps the React AuthContext updated across every page.”
“مستمع onAuthStateChanged() في Firebase Authentication يتابع تغييرات حالة تسجيل الدخول ويحافظ على تحديث AuthContext في React عبر كل الصفحات.”
AI Builder Tips
Avoid these mistakes when using Authentication:
Confusing authentication (who you are) with authorization (what you can do)
Only checking auth on the frontend — always verify the ID token server-side
Storing the Firebase ID token in localStorage instead of a secure HttpOnly cookie
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Help me build a project using Authentication. Explain: 1. What is Authentication and why it matters 2. The core architecture and required tools 3. Step-by-step implementation plan 4. Common mistakes to avoid: Confusing authentication (who you are) with authorization (what you can do), Only checking auth on the frontend — always verify the ID token server-side, Storing the Firebase ID token in localStorage instead of a secure HttpOnly cookie 5. Best practices and production tips