implement login + logout routes and templates

+ Added route: GET `/login` via `aurweb.routers.auth.login_get`
+ Added route: POST `/login` via `aurweb.routers.auth.login_post`
+ Added route: GET `/logout` via `aurweb.routers.auth.logout`
+ Added route: POST `/logout` via `aurweb.routers.auth.logout_post`
* Modify archdev-navbar.html template to toggle displays on auth state
+ Added login.html template

Signed-off-by: Kevin Morris <kevr@0cost.org>

templates/login.html

@@ -0,0 +1,84 @@
+{% extends 'partials/layout.html' %}
+
+{% block pageContent %}
+
+<div id="dev-login" class="box">
+    <h2>AUR {% trans %}Login{% endtrans %}</h2>
+
+    {% if request.url.scheme == "http" and config.getboolean("options", "disable_http_login") %}
+        {% set https_login = url_base.replace("http://", "https://") + "/login/" %}
+        <p>
+        {{ "HTTP login is disabled. Please %sswitch to HTTPs%s if you want to login."
+        | tr
+        | format(
+            '<a href="%s">' | format(https_login),
+            "</a>")
+        | safe
+        }}
+        </p>
+    {% else %}
+        {% if request.user.is_authenticated() %}
+            <p>
+            {{ "Logged-in as: %s"
+            | tr
+            | format("<b>%s</b>" | format(request.user.Username))
+            | safe
+            }}
+            <a href="/logout/?next={{ next }}">[{% trans %}Logout{% endtrans %}]</a>
+            </p>
+        {% else %}
+        <form method="post" action="/login?next={{ next }}">
+            <fieldset>
+                <legend>{% trans %}Enter login credentials{% endtrans %}</legend>
+
+                {% if errors %}
+                    <ul class="errorlist">
+                        {% for error in errors %}
+                            <li>{{ error }}</li>
+                        {% endfor %}
+                    </ul>
+                {% endif %}
+
+                <p>
+                    <label for="id_username">
+                        {% trans %}User name or primary email address{% endtrans %}:
+                    </label>
+
+                    <input id="id_username" type="text" name="user" size="30"
+                           maxlength="254" autofocus="autofocus">
+                </p>
+
+                <p>
+                    <label for="id_password">
+                        {% trans %}Password{% endtrans %}:
+                    </label>
+                    <input id="id_password" type="password" name="passwd"
+                           size="30">
+                </p>
+
+                <p>
+                    <input id="id_remember_me" type="checkbox" name="remember_me">
+                    <label for="id_remember_me">
+                        {% trans %}Remember me{% endtrans %}
+                    </label>
+                </p>
+
+                <p>
+                    <input class="button" type="submit"
+                           value="{% trans %}Login{% endtrans %}">
+                    <a href="/passreset/">
+                        [{% trans %}Forgot Password{% endtrans %}]
+                    </a>
+                    <input id="id_referer" type="hidden" name="referer"
+                           value="{{ url_base }}">
+                    <input type="hidden" name="next" value="{{ next }}">
+                </p>
+
+            </fieldset>
+        </form>
+        {% endif %}
+    {% endif %}
+
+</div>
+
+{% endblock %}

templates/partials/archdev-navbar.html

@@ -1,8 +1,22 @@
 <div id="archdev-navbar">
     <ul>
-        <li><a href="/">AUR {% trans %}Home{% endtrans %}</a></li>
+        {% if request.user.is_authenticated() %}
+            <li><a href="/">{% trans %}Dashboard{% endtrans %}</a></li>
+        {% else %}
+            <li><a href="/">AUR {% trans %}Home{% endtrans %}</a></li>
+        {% endif %}
         <li><a href="/packages/">{% trans %}Packages{% endtrans %}</a></li>
         <li><a href="/register/">{% trans %}Register{% endtrans %}</a></li>
-        <li><a href="/login/">{% trans %}Login{% endtrans %}</a></li>
+        <li>
+            {% if request.user.is_authenticated() %}
+                <a href="/logout/?next={{ next }}">
+                    {% trans %}Logout{% endtrans %}
+                </a>
+            {% else %}
+                <a href="/login/?next={{ next }}">
+                    {% trans %}Login{% endtrans %}
+                </a>
+            {% endif %}
+        </li>
     </ul>
 </div>