Notifications: Add support for Microsoft Teams (#812)

docs/notifications.md

@@ -21,7 +21,8 @@ Notifications are set up in your credentials json file. They will use the `notif
         ...
   } ,
   "notifications":{
-      "slack_url": "https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX"
+      "slack_url": "https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX",
+      "teams_url": "https://outlook.office.com/webhook/00000000-0000-0000-0000-000000000000@00000000-0000-0000-0000-000000000000/IncomingWebhook/00000000000000000000000000000000/00000000-0000-0000-0000-000000000000"
   }
 ```
 
@@ -36,6 +37,13 @@ Please see the [Slack documentation](https://api.slack.com/messaging/webhooks) o
 
 Configure `slack_url` to this webhook. Mattermost works as well, as they share the same api,
 
+### Microsoft Teams
+
+If you want to use the Teams integration, you need to create a webhook in Teams.
+Please see the [Teams documentation](https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/add-incoming-webhook#add-an-incoming-webhook-to-a-teams-channel)
+
+Configure `teams_url` to this webhook.
+
 ### Bonfire
 
 This is stack overflow's built in chat system. This is probably not useful for most people.

pkg/notifications/teams.go

@@ -0,0 +1,52 @@
+package notifications
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+func init() {
+	initers = append(initers, func(cfg map[string]string) Notifier {
+		url, ok := cfg["slack_url"]
+		if !ok {
+			return nil
+		}
+
+		notifier := &slackNotifier{
+			URL: url,
+		}
+		return notifier
+	})
+}
+
+// teamsNotifier sends notifications to teams or mattermost
+type teamsNotifier struct {
+	URL string
+}
+
+func (s *teamsNotifier) Notify(domain, provider, msg string, err error, preview bool) {
+	var payload struct {
+		Username string `json:"username"`
+		Text     string `json:"text"`
+	}
+	payload.Username = "DnsControl"
+
+	// Format changes as 'preformated' text
+	msg = strings.ReplaceAll(msg, "\n", "\n    ")
+
+	if preview {
+		payload.Text = fmt.Sprintf("**DnsControl Preview %s**\n%s", domain, msg)
+	} else if err != nil {
+		payload.Text = fmt.Sprintf("**DnsControl Error Making Changes %s**\n%s\nError: %s", domain, msg, err)
+	} else {
+		payload.Text = fmt.Sprintf("**DnsControl Successfully Changed %s**\n%s", domain, msg)
+	}
+
+	json, _ := json.Marshal(payload)
+	http.Post(s.URL, "text/json", bytes.NewReader(json))
+}
+
+func (s *teamsNotifier) Done() {}