ogcp: use csv as new format for import clients

Replace dhcpd format with the simpler csv format to configure
the list of clients to import in /action/clients/import.
Replace regex parsing with a simpler manual parsing.
Improve error report.

Example configuration:
client_name1,94:c6:91:a6:25:1a,10.141.10.100
client_name2,94:c6:91:a6:25:1b,10.141.10.101

ogcp/forms/action_forms.py

@@ -160,7 +160,7 @@ class ImportClientsForm(FlaskForm):
     server = HiddenField()
     room = SelectField(label=_l('Room'))
     repo = SelectField(label=_l('Repository'))
-    dhcpd_conf = TextAreaField(label=_l('dhcpd configuration'))
+    client_conf = TextAreaField(label=_l('Client configuration'))
     import_btn = SubmitField(label=_l('Import'))
 
 class BootModeForm(FlaskForm):

ogcp/views.py

@@ -96,6 +96,9 @@ class ServerError(Exception):
 class ServerErrorCode(Exception):
     pass
 
+def split_csv(s):
+     return re.split(r'\s*,\s*', s)
+
 def normalize_mac(mac):
     return mac.replace(':', '').replace('-', '').replace('.', '').lower()
 
@@ -1709,13 +1712,9 @@ def action_client_move():
                                 scopes=scopes)
 
 
-PLACEHOLDER_TEXT = '''host example1 { hardware ethernet 94:c6:91:a6:25:1a; fixed-address 10.141.10.100; }
-host example2 { hardware ethernet 94:c6:91:a6:25:1b; fixed-address 10.141.10.101; }
-host example3 { hardware ethernet 94:c6:91:a6:25:1c; fixed-address 10.141.10.102; }
-host example4 { hardware ethernet 94:c6:91:a6:25:1d; fixed-address 10.141.10.103; }
-host example5 { hardware ethernet 94:c6:91:a6:25:1e; fixed-address 10.141.10.104; }
-host example6 { hardware ethernet 94:c6:91:a6:25:1f; fixed-address 10.141.10.105; }
-...'''
+PLACEHOLDER_CLIENT_IMPORT_TEXT = '''client_name1,94:c6:91:a6:25:1a,10.141.10.100
+client_name2,94:c6:91:a6:25:1b,10.141.10.101'''
+
 @app.route('/action/clients/import', methods=['GET'])
 @login_required
 def action_clients_import_get():
@@ -1746,22 +1745,13 @@ def action_clients_import_get():
     except ServerErrorCode:
         return ogserver_error('scopes')
     form.repo.choices = [(repo["id"], repo["name"]) for repo in repositories]
-    form.dhcpd_conf.render_kw = {'placeholder': PLACEHOLDER_TEXT}
+    form.client_conf.render_kw = {'placeholder': PLACEHOLDER_CLIENT_IMPORT_TEXT}
 
     scopes, _clients = get_scopes()
     return render_template('actions/import_clients.html', form=form,
                            scopes=scopes)
 
 
-OG_REGEX_DHCPD_CONF = (r'(?:\s*host\s*)'
-                       r'([\w.-]*)'
-                       r'(?:\s*{[ \n\r]*)'
-                       r'(?:\s*hardware *ethernet *)'
-                       r'((?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2}))'
-                       r'(?:\s*;)'
-                       r'(?:\s*fixed-address *)'
-                       r'(\d+\.\d+\.\d+\.\d+)'
-                       r'(?:\s*;)(?:\s*[^}]*})')
 OG_CLIENT_DEFAULT_BOOT = "pxe"
 OG_CLIENT_DEFAULT_LIVEDIR = "ogLive"
 OG_CLIENT_DEFAULT_MAINTENANCE = False
@@ -1775,11 +1765,42 @@ OG_CLIENT_DEFAULT_REMOTE = False
 def action_clients_import_post():
     form = ImportClientsForm(request.form)
     server = get_server_from_ip_port(form.server.data)
-    clients = re.findall(OG_REGEX_DHCPD_CONF, form.dhcpd_conf.data)
+
+    clients = []
+    for client_data in form.client_conf.data.splitlines():
+        client_values = split_csv(client_data)
+
+        if len(client_values) != 3 or any(not v for v in client_values):
+            flash(_('Each client requires 3 values'), category='error')
+            return redirect(url_for('scopes'))
+
+        client_name = client_values[0]
+
+        client_mac = client_values[1]
+        normalized_mac = normalize_mac(client_mac)
+
+        if not is_valid_normalized_mac(normalized_mac):
+            flash(_(f'Invalid MAC address {client_mac}'), category='error')
+            return redirect(url_for("scopes"))
+
+        client_ip = client_values[2]
+
+        try:
+            ipaddress.ip_address(client_ip)
+        except ValueError as e:
+            flash(_(f'Invalid IP address {client_ip}'), category='error')
+            return redirect(url_for("scopes"))
+
+        clients.append({
+            'name': client_name,
+            'mac': normalized_mac,
+            'ip': client_ip
+        })
+
     if not clients:
-        flash(_('No clients found. Check the dhcpd.conf file.'),
-              category='error')
+        flash(_('No client configuration found'), category='error')
         return redirect(url_for('scopes'))
+
     payload = {'boot': OG_CLIENT_DEFAULT_BOOT,
                'livedir': OG_CLIENT_DEFAULT_LIVEDIR,
                'maintenance': OG_CLIENT_DEFAULT_MAINTENANCE,
@@ -1789,15 +1810,17 @@ def action_clients_import_post():
                'remote': OG_CLIENT_DEFAULT_REMOTE,
                "repo_id": int(form.repo.data),
                'room': int(form.room.data)}
+
     for client in clients:
-        payload['name'] = client[0]
-        payload['mac'] = normalize_mac(client[1])
-        payload['ip'] = client[2]
+        for key, value in client.items():
+            payload[key] = value
         resp = server.post('/client/add', payload)
+
         if resp.status_code != requests.codes.ok:
-            flash(_('ogServer: error adding client {}').format(client[0]),
+            flash(_('ogServer: error adding client {}').format(client['name']),
                   category='error')
             return redirect(url_for('scopes'))
+
     flash(_('Clients imported successfully'), category='info')
     return redirect(url_for('scopes'))