refractor blogpost and cdn chall

services/cdn/templates/base.html

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+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8" />
+  <title>pix.cdn — demo</title>
+  <link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}" />
+</head>
+<body>
+  <header class="topbar">
+    <a href="{{ url_for('gallery') }}" class="brand">pix.cdn</a>
+    <nav>
+      {% if session.get('uid') %}
+        <a href="{{ url_for('upload') }}">Upload</a>
+        <a href="{{ url_for('logout') }}">Logout</a>
+      {% else %}
+        <a href="{{ url_for('login') }}">Login</a>
+        <a href="{{ url_for('register') }}">Register</a>
+      {% endif %}
+    </nav>
+  </header>
+
+  {% with msgs = get_flashed_messages() %}
+    {% if msgs %}
+      <div class="flash">
+        {% for m in msgs %}<div>{{ m }}</div>{% endfor %}
+      </div>
+    {% endif %}
+  {% endwith %}
+
+  <main class="container">
+    {% block content %}{% endblock %}
+  </main>
+
+  <footer class="foot">© pix.cdn</footer>
+</body>
+</html>