syncthing: Update Apache configuration

- Redirect /syncthing to /syncthing/ as the daemon does not work
  without a slash at the end.

- Create a separate include file for LDAP authentication
  configuration that can be included on other app configurations.

data/etc/apache2/conf-available/syncthing-plinth.conf

@@ -1,13 +1,20 @@
-ProxyPass /syncthing/ http://localhost:8384/
+##
+## On all sites, provide syncthing web interface on a path: /syncthing
+##
 
-<Location /syncthing/>
-    ProxyPassReverse http://localhost:8384/
-    AuthType basic
-    AuthName "FreedomBox Login"
-    AuthBasicProvider ldap
-    AuthLDAPUrl "ldap:///ou=users,dc=thisbox?uid"
-    AuthLDAPGroupAttribute memberUid
-    AuthLDAPGroupAttributeIsDN off
-    Require valid-user
+# Redirect /syncthing to /syncthing/ as the Syncthing server does not
+# work without a slash at the end.
+<Location /syncthing>
+    <IfModule mod_rewrite.c>
+        RewriteEngine On
+        RewriteCond %{REQUEST_URI} ^/syncthing$
+        RewriteRule .* /syncthing/ [R=301,L]
+    </IfModule>
 </Location>
 
+<Location /syncthing/>
+    ProxyPass http://localhost:8384/
+
+    Include includes/freedombox-auth-ldap.conf
+    Require ldap-group cn=admin,ou=groups,dc=thisbox
+</Location>

data/etc/apache2/includes/freedombox-auth-ldap.conf

@@ -0,0 +1,6 @@
+AuthType basic
+AuthName "FreedomBox Login"
+AuthBasicProvider ldap
+AuthLDAPUrl "ldap:///ou=users,dc=thisbox?uid"
+AuthLDAPGroupAttribute memberUid
+AuthLDAPGroupAttributeIsDN off

setup.py

@@ -209,6 +209,8 @@ setuptools.setup(
                  glob.glob('data/etc/apache2/conf-available/*.conf')),
                 ('/etc/apache2/sites-available',
                  glob.glob('data/etc/apache2/sites-available/*.conf')),
+                ('/etc/apache2/includes',
+                 glob.glob('data/etc/apache2/includes/*.conf')),
                 ('/etc/ikiwiki',
                  glob.glob('data/etc/ikiwiki/*.setup')),
                 ('/etc/NetworkManager/dispatcher.d/',