Add support for displaying the alert's GeneratorURL

README.md

@@ -19,7 +19,7 @@ of this file is [scfg] and there is an [example configuration file] in this repo
 Furthermore you can take a look at [my deployment].
 
 ntfy-alertmanager has support for setting ntfy [priority], [tags], [icon], [action buttons]
-(which can be used to create an Alertmanager silence), [email notifications] and [phone calls].
+(which can be used to e.g. create an Alertmanager silence or open the alert's Prometheus URL), [email notifications] and [phone calls].
 Define a decreasing order of labels in the config file and map those labels to tags, priority, an icon or an email address.
 
 - For priority and icon the first found value will be chosen. Settings for "resolved" alerts will take precedence.

config.scfg

@@ -87,8 +87,12 @@ ntfy {
     # Default: ""
     email-address foo@example.com
     # Call the specified number for all alerts. Use `yes` to pick the first of your verified numbers.
-    Default: ""
+    # Default: ""
     call +123456789
+    # Add a button that will open the alert's generator/Prometheus URL with the following label.
+    # This only works for the "single" alert-mode.
+    # Default: ""
+    generator-url-label source
 }
 
 alertmanager {

config/config.go

@@ -44,6 +44,7 @@ type ntfyConfig struct {
 	CertFingerprint   string
 	EmailAddress      string
 	Call              string
+	GeneratorURLLabel string
 }
 
 type labels struct {
@@ -272,6 +273,13 @@ func parseBlock(block scfg.Block, config *Config) error {
 				return err
 			}
 		}
+
+		d = ntfyDir.Children.Get("generator-url-label")
+		if d != nil {
+			if err := d.ParseParams(&config.Ntfy.GeneratorURLLabel); err != nil {
+				return err
+			}
+		}
 	}
 
 	cacheDir := block.Get("cache")

config/config_test.go

@@ -50,6 +50,7 @@ ntfy {
     certificate-fingerprint 13:6D:2B:88:9C:57:36:D0:81:B4:B2:9C:79:09:27:62:92:CF:B8:6A:6B:D3:AD:46:35:CB:70:17:EB:99:6E:28:08:2A:B8:C6:79:4B:F6:2E:81:79:41:98:1D:53:C8:07:B3:5C:24:5F:B1:8E:B6:FB:66:B5:DD:B4:D0:5C:29:91
     user user
     password pass
+    generator-url-label source
 }
 
 alertmanager {
@@ -80,6 +81,7 @@ cache {
 			User:              "user",
 			Password:          "pass",
 			CertFingerprint:   "136d2b889c5736d081b4b29c7909276292cfb86a6bd3ad4635cb7017eb996e28082ab8c6794bf62e817941981d53c807b35c245fb18eb6fb66b5ddb4d05c2991",
+			GeneratorURLLabel: "source",
 		},
 		Labels: labels{Order: []string{"severity", "instance"},
 			Label: map[string]labelConfig{

main.go

@@ -53,6 +53,7 @@ type alert struct {
 	Status       string            `json:"status"`
 	Labels       map[string]string `json:"labels"`
 	Annotations  map[string]string `json:"annotations"`
+	GeneratorURL string            `json:"generatorURL"`
 	Fingerprint  string            `json:"fingerprint"`
 }
 
@@ -67,6 +68,7 @@ type notification struct {
 	silenceBody  string
 	fingerprint  string
 	status       string
+	generatorURL string
 }
 
 type ntfyError struct {
@@ -91,6 +93,7 @@ func (br *bridge) singleAlertNotifications(p *payload) []*notification {
 		n := new(notification)
 		n.fingerprint = alert.Fingerprint
 		n.status = alert.Status
+		n.generatorURL = alert.GeneratorURL
 
 		// create title
 		n.title = fmt.Sprintf("[%s]", strings.ToUpper(alert.Status))
@@ -295,6 +298,8 @@ func (br *bridge) publish(n *notification) error {
 		return err
 	}
 
+	var actions []string
+
 	// ntfy authentication
 	if br.cfg.Ntfy.Password != "" && br.cfg.Ntfy.User != "" {
 		req.SetBasicAuth(br.cfg.Ntfy.User, br.cfg.Ntfy.Password)
@@ -333,9 +338,20 @@ func (br *bridge) publish(n *notification) error {
 			authString = fmt.Sprintf(", headers.Authorization=Basic %s", auth)
 		}
 
-		req.Header.Set("Actions", fmt.Sprintf("http, Silence, %s, method=POST, body=%s%s", url, n.silenceBody, authString))
+		actions = append(actions, fmt.Sprintf("http, Silence, %s, method=POST, body=%s%s", url, n.silenceBody, authString))
 	}
 
+	if br.cfg.Ntfy.GeneratorURLLabel != "" && n.generatorURL != "" {
+		actions = append(actions, fmt.Sprintf("view, %s, %s", br.cfg.Ntfy.GeneratorURLLabel, n.generatorURL))
+	}
+
+	nActions := len(actions)
+	if nActions > 3 {
+		// TODO: Limit actions to three
+		br.logger.Warn(fmt.Sprintf("Publish: Too many actions (%d), ntfy only supports up to three.", nActions))
+	}
+	req.Header.Set("Actions", strings.Join(actions, ";"))
+
 	configFingerprint := br.cfg.Ntfy.CertFingerprint
 	if configFingerprint != "" {
 		tlsCfg := &tls.Config{}