Adding Mattermost webhook support

Signed-off-by: Loïc Dubard <loic.dubard@csgroup.eu>

Readme.md

@@ -54,13 +54,13 @@ Use [sample config](./config.sample.yaml) as an example.
 - [ ] Notification services
   - [x] Discord
   - [x] Gotify
-  - [ ] Mattermost
+  - [x] Mattermost
   - [ ] Slack
   - [ ] Telegram
 - [ ] Automation (GitHub Actions)
   - [ ] Coverage tests
   - [x] pre-commit
-  - [ ] Trivy security scan
+  - [x] Trivy security scan
   - [x] Docker build & push (latest + releases)
 
 ## References

config.sample.yaml

@@ -23,6 +23,11 @@ notifications:
       webhook: toto
       username: kube-notify
       # avatar_url: changeme
+    mattermost:
+      webhook: https://chat.local/hooks/aaaaaaaaa
+      # username: kube-notify
+      # icon_url: https://kubernetes.io/images/k8s-10th-birthday.svg
+      # channel: Kube-notify
   custom_group:
     resources:
       - name: customResources

kube_notify/mattermost.py

@@ -0,0 +1,30 @@
+import json
+
+import requests
+
+import kube_notify.logger as logger
+
+
+def send_mattermost_message(
+    url: str,
+    title: str,
+    description: str,
+    fields: dict,
+    channel: str | None = None,
+    username: str | None = None,
+    icon_url: str | None = None,
+) -> None:
+    # Construct the HTTP request for sending a message to Mattermost
+    headers = {"Content-Type": "application/json"}
+    message = f"### {title}\n\n"
+    message += f"**Description : {description}**\n\n"
+
+    for key, value in fields.items():
+        message += f"*{key} :*\n{value}\n\n"
+    data = {"text": message}
+    channel and data.update({"channel": channel})
+    username and data.update({"username": username})
+    icon_url and data.update({"icon_url": icon_url})
+    response = requests.post(url, headers=headers, data=json.dumps(data))
+    if response.status_code != 200:
+        logger.logger.error("Failed to send notification to Mattermost")

kube_notify/notifications.py

@@ -2,6 +2,7 @@
 import kube_notify.discord as discord
 import kube_notify.gotify as gotify
 import kube_notify.logger as logger
+import kube_notify.mattermost as mattermost
 import kube_notify.selectors as selectors
 
 
@@ -72,4 +73,15 @@ async def handle_notify(
                         description,
                         fields,
                     )
+                if group_values := group.get("mattermost"):
+                    notifs.append(f"{group_name}/mattermost")
+                    mattermost.send_mattermost_message(
+                        group_values["url"],
+                        title,
+                        description,
+                        fields,
+                        group_values.get("channel"),
+                        group_values.get("username"),
+                        group_values.get("icon_url"),
+                    )
     logger.logger.info(f"{event_info[0]} [{','.join(notifs)}] {description}")