Add support for BasicAuth to prometheus plugin

plugins/prometheus/README.md

@@ -48,6 +48,24 @@ ALERTMANAGER_API_URL = 'http://demo.robustperception.io:9093'  # default=http://
 ALERTMANAGER_SILENCE_DAYS = 2  # default=1
 ```
 
+Authentication
+--------------
+
+Prometheus Alertmanager [does not provide any form of authentication][1] by
+default. For convenience, this plugin will support Basic Auth if it has
+been configured (using a reverse proxy or otherwise). Any other form of
+authentication will require development work by the user.
+
+[1]: (https://prometheus.io/docs/operating/security/#authentication-authorization-and-encryption)
+
+**Example of BasicAuth configuration**
+
+```python
+ALERTMANAGER_API_URL = 'http://localhost:9093'
+ALERTMANAGER_USERNAME = 'promuser'
+ALERTMANAGER_PASSWORD = 'prompass'
+```
+
 Troubleshooting
 ---------------
 

plugins/prometheus/alerta_prometheus.py

@@ -15,12 +15,19 @@ LOG = logging.getLogger('alerta.plugins.prometheus')
 DEFAULT_ALERTMANAGER_API_URL = 'http://localhost:9093'
 
 ALERTMANAGER_API_URL = os.environ.get('ALERTMANAGER_API_URL') or app.config.get('ALERTMANAGER_API_URL', None)
-ALERTMANAGER_API_KEY = os.environ.get('ALERTMANAGER_API_KEY') or app.config.get('ALERTMANAGER_API_KEY', '')  # not used
+ALERTMANAGER_USERNAME = os.environ.get('ALERTMANAGER_USERNAME') or app.config.get('ALERTMANAGER_USERNAME', None)
+ALERTMANAGER_PASSWORD = os.environ.get('ALERTMANAGER_PASSWORD') or app.config.get('ALERTMANAGER_PASSWORD', None)
 ALERTMANAGER_SILENCE_DAYS = os.environ.get('ALERTMANAGER_SILENCE_DAYS') or app.config.get('ALERTMANAGER_SILENCE_DAYS', 1)
 
 
 class AlertmanagerSilence(PluginBase):
 
+    def __init__(self, name=None):
+
+        self.auth = (ALERTMANAGER_USERNAME, ALERTMANAGER_PASSWORD) if ALERTMANAGER_USERNAME else None
+
+        super(AlertmanagerSilence, self).__init__(name)
+
     def pre_receive(self, alert):
         return alert
 
@@ -68,7 +75,7 @@ class AlertmanagerSilence(PluginBase):
             LOG.debug('Alertmanager: data=%s', data)
 
             try:
-                r = requests.post(url, json=data, timeout=2)
+                r = requests.post(url, json=data, auth=self.auth, timeout=2)
             except Exception as e:
                 raise RuntimeError("Alertmanager: ERROR - %s" % e)
             LOG.debug('Alertmanager: %s - %s', r.status_code, r.text)
@@ -90,7 +97,7 @@ class AlertmanagerSilence(PluginBase):
                 base_url = ALERTMANAGER_API_URL or alert.attributes.get('externalUrl', DEFAULT_ALERTMANAGER_API_URL)
                 url = base_url + '/api/v1/silence/%s' % silenceId
                 try:
-                    r = requests.delete(url, timeout=2)
+                    r = requests.delete(url, auth=self.auth, timeout=2)
                 except Exception as e:
                     raise RuntimeError("Alertmanager: ERROR - %s" % e)
                 LOG.debug('Alertmanager: %s - %s', r.status_code, r.text)

plugins/prometheus/setup.py

@@ -1,7 +1,7 @@
 
 from setuptools import setup, find_packages
 
-version = '5.3.6'
+version = '5.4.0'
 
 setup(
     name="alerta-prometheus",