feat: add event type and action filtering

Configure which events to forward via comma-separated 'events' config.
Supports event-level ('push', 'pull_request') or event:action-level
('pull_request:opened', 'issues:closed') filtering.

Empty/omitted = forward everything (backwards compatible).

config.example.toml

@@ -15,3 +15,18 @@ signal_recipient = ""
 
 # OR: Signal group ID for group notifications (overrides signal_recipient)
 # signal_group_id = ""
+
+# Event filter — comma-separated list of event types to forward.
+# Use "event" for all actions, or "event:action" for specific actions.
+# Leave empty or omit to forward everything.
+#
+# Examples:
+#   events = "pull_request:opened, pull_request:closed, issues:opened"
+#   events = "push, pull_request, workflow_run"
+#   events = "pull_request:opened"
+#
+# Available events: push, issues, issue_comment, pull_request,
+#   pull_request_review, pull_request_review_comment, release,
+#   star, fork, workflow_run, create, delete
+#
+# events = ""

config.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/taigrr/jety"
+import (
+	"strings"
+
+	"github.com/taigrr/jety"
+)
 
 // Config holds the application configuration.
 type Config struct {
@@ -16,6 +20,8 @@ type Config struct {
 	SignalRecipient string
 	// SignalGroupID is the Signal group ID for group notifications (overrides SignalRecipient).
 	SignalGroupID string
+	// Events is the event filter. Empty means all events are forwarded.
+	Events EventFilter
 }
 
 func loadConfig() Config {
@@ -27,6 +33,18 @@ func loadConfig() Config {
 	jety.SetConfigType("toml")
 	_ = jety.ReadInConfig()
 
+	// Parse events filter from comma-separated string or TOML array.
+	var filters []string
+	raw := jety.GetString("events")
+	if raw != "" {
+		for _, s := range strings.Split(raw, ",") {
+			s = strings.TrimSpace(s)
+			if s != "" {
+				filters = append(filters, s)
+			}
+		}
+	}
+
 	return Config{
 		ListenAddr:      jety.GetString("listen_addr"),
 		WebhookSecret:   jety.GetString("webhook_secret"),
@@ -34,5 +52,6 @@ func loadConfig() Config {
 		SignalAccount:   jety.GetString("signal_account"),
 		SignalRecipient: jety.GetString("signal_recipient"),
 		SignalGroupID:   jety.GetString("signal_group_id"),
+		Events:          ParseEventFilter(filters),
 	}
 }

filter.go

@@ -0,0 +1,82 @@
+package main
+
+import "strings"
+
+// EventFilter determines which event/action combinations to forward.
+// An empty filter allows everything (default behavior).
+type EventFilter struct {
+	rules map[string]map[string]bool // event -> actions (empty map = all actions)
+}
+
+// ParseEventFilter parses a list of filter strings into an EventFilter.
+// Format: "event" (all actions) or "event:action" (specific action).
+//
+// Examples:
+//
+//	["pull_request:opened", "pull_request:closed"] — only PR open/close
+//	["push", "issues"] — all push and issue events
+//	["pull_request:opened", "workflow_run"] — PR opens + all workflow runs
+//	[] — everything allowed (no filtering)
+func ParseEventFilter(filters []string) EventFilter {
+	ef := EventFilter{rules: make(map[string]map[string]bool)}
+
+	for _, f := range filters {
+		f = strings.TrimSpace(f)
+		if f == "" {
+			continue
+		}
+
+		event, action, hasAction := strings.Cut(f, ":")
+		event = strings.ToLower(strings.TrimSpace(event))
+		if event == "" {
+			continue
+		}
+
+		if _, ok := ef.rules[event]; !ok {
+			ef.rules[event] = make(map[string]bool)
+		}
+
+		if hasAction {
+			action = strings.ToLower(strings.TrimSpace(action))
+			if action != "" {
+				ef.rules[event][action] = true
+			}
+		}
+	}
+
+	return ef
+}
+
+// IsEmpty returns true if no filters are configured (allow everything).
+func (ef EventFilter) IsEmpty() bool {
+	return len(ef.rules) == 0
+}
+
+// EventEnabled returns true if the event type is in the filter.
+func (ef EventFilter) EventEnabled(event string) bool {
+	if ef.IsEmpty() {
+		return true
+	}
+	_, ok := ef.rules[strings.ToLower(event)]
+	return ok
+}
+
+// Allowed returns true if the event/action combination should be forwarded.
+func (ef EventFilter) Allowed(event, action string) bool {
+	if ef.IsEmpty() {
+		return true
+	}
+
+	event = strings.ToLower(event)
+	actions, ok := ef.rules[event]
+	if !ok {
+		return false
+	}
+
+	// No specific actions configured = all actions allowed
+	if len(actions) == 0 {
+		return true
+	}
+
+	return actions[strings.ToLower(action)]
+}

filter_test.go

@@ -0,0 +1,32 @@
+package main
+
+import "testing"
+
+func TestEventFilter(t *testing.T) {
+	tests := []struct {
+		name    string
+		filters []string
+		event   string
+		action  string
+		want    bool
+	}{
+		{"empty allows all", nil, "push", "", true},
+		{"event only", []string{"push"}, "push", "", true},
+		{"event only blocks other", []string{"push"}, "issues", "opened", false},
+		{"event:action match", []string{"pull_request:opened"}, "pull_request", "opened", true},
+		{"event:action no match", []string{"pull_request:opened"}, "pull_request", "closed", false},
+		{"multiple actions", []string{"pull_request:opened", "pull_request:closed"}, "pull_request", "closed", true},
+		{"mixed event and action", []string{"push", "pull_request:opened"}, "push", "", true},
+		{"mixed blocks filtered", []string{"push", "pull_request:opened"}, "pull_request", "closed", false},
+		{"case insensitive", []string{"Pull_Request:Opened"}, "pull_request", "opened", true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ef := ParseEventFilter(tt.filters)
+			if got := ef.Allowed(tt.event, tt.action); got != tt.want {
+				t.Errorf("Allowed(%q, %q) = %v, want %v", tt.event, tt.action, got, tt.want)
+			}
+		})
+	}
+}

main.go

@@ -26,25 +26,57 @@ func main() {
 	signal := signalcli.NewClient(cfg.SignalURL, cfg.SignalAccount)
 	handle := githubevents.New(cfg.WebhookSecret)
 
-	notifier := &notifier{
+	n := &notifier{
 		signal:    signal,
 		recipient: cfg.SignalRecipient,
 		groupID:   cfg.SignalGroupID,
+		filter:    cfg.Events,
 	}
 
-	// Register event handlers.
-	handle.OnPushEventAny(notifier.onPush)
-	handle.OnIssuesEventAny(notifier.onIssue)
-	handle.OnIssueCommentEventAny(notifier.onIssueComment)
-	handle.OnPullRequestEventAny(notifier.onPR)
-	handle.OnPullRequestReviewEventAny(notifier.onPRReview)
-	handle.OnPullRequestReviewCommentEventAny(notifier.onPRReviewComment)
-	handle.OnReleaseEventAny(notifier.onRelease)
-	handle.OnStarEventAny(notifier.onStar)
-	handle.OnForkEventAny(notifier.onFork)
-	handle.OnWorkflowRunEventAny(notifier.onWorkflowRun)
-	handle.OnCreateEventAny(notifier.onCreate)
-	handle.OnDeleteEventAny(notifier.onDelete)
+	// Register event handlers (only for enabled events).
+	f := cfg.Events
+	if f.EventEnabled("push") {
+		handle.OnPushEventAny(n.onPush)
+	}
+	if f.EventEnabled("issues") {
+		handle.OnIssuesEventAny(n.onIssue)
+	}
+	if f.EventEnabled("issue_comment") {
+		handle.OnIssueCommentEventAny(n.onIssueComment)
+	}
+	if f.EventEnabled("pull_request") {
+		handle.OnPullRequestEventAny(n.onPR)
+	}
+	if f.EventEnabled("pull_request_review") {
+		handle.OnPullRequestReviewEventAny(n.onPRReview)
+	}
+	if f.EventEnabled("pull_request_review_comment") {
+		handle.OnPullRequestReviewCommentEventAny(n.onPRReviewComment)
+	}
+	if f.EventEnabled("release") {
+		handle.OnReleaseEventAny(n.onRelease)
+	}
+	if f.EventEnabled("star") {
+		handle.OnStarEventAny(n.onStar)
+	}
+	if f.EventEnabled("fork") {
+		handle.OnForkEventAny(n.onFork)
+	}
+	if f.EventEnabled("workflow_run") {
+		handle.OnWorkflowRunEventAny(n.onWorkflowRun)
+	}
+	if f.EventEnabled("create") {
+		handle.OnCreateEventAny(n.onCreate)
+	}
+	if f.EventEnabled("delete") {
+		handle.OnDeleteEventAny(n.onDelete)
+	}
+
+	if f.IsEmpty() {
+		log.Println("event filter: all events enabled")
+	} else {
+		log.Printf("event filter: %v", f.rules)
+	}
 
 	handle.OnError(func(_ context.Context, _ string, _ string, _ interface{}, err error) error {
 		log.Printf("webhook error: %v", err)
@@ -75,6 +107,7 @@ type notifier struct {
 	signal    *signalcli.Client
 	recipient string
 	groupID   string
+	filter    EventFilter
 }
 
 func (n *notifier) send(ctx context.Context, msg string) {
@@ -94,61 +127,97 @@ func (n *notifier) send(ctx context.Context, msg string) {
 }
 
 func (n *notifier) onPush(ctx context.Context, _ string, _ string, event *github.PushEvent) error {
+	if !n.filter.Allowed("push", "") {
+		return nil
+	}
 	n.send(ctx, formatPush(event))
 	return nil
 }
 
 func (n *notifier) onIssue(ctx context.Context, _ string, _ string, event *github.IssuesEvent) error {
+	if !n.filter.Allowed("issues", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatIssue(event))
 	return nil
 }
 
 func (n *notifier) onIssueComment(ctx context.Context, _ string, _ string, event *github.IssueCommentEvent) error {
+	if !n.filter.Allowed("issue_comment", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatIssueComment(event))
 	return nil
 }
 
 func (n *notifier) onPR(ctx context.Context, _ string, _ string, event *github.PullRequestEvent) error {
+	if !n.filter.Allowed("pull_request", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatPR(event))
 	return nil
 }
 
 func (n *notifier) onPRReview(ctx context.Context, _ string, _ string, event *github.PullRequestReviewEvent) error {
+	if !n.filter.Allowed("pull_request_review", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatPRReview(event))
 	return nil
 }
 
 func (n *notifier) onPRReviewComment(ctx context.Context, _ string, _ string, event *github.PullRequestReviewCommentEvent) error {
+	if !n.filter.Allowed("pull_request_review_comment", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatPRReviewComment(event))
 	return nil
 }
 
 func (n *notifier) onRelease(ctx context.Context, _ string, _ string, event *github.ReleaseEvent) error {
+	if !n.filter.Allowed("release", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatRelease(event))
 	return nil
 }
 
 func (n *notifier) onStar(ctx context.Context, _ string, _ string, event *github.StarEvent) error {
+	if !n.filter.Allowed("star", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatStar(event))
 	return nil
 }
 
 func (n *notifier) onFork(ctx context.Context, _ string, _ string, event *github.ForkEvent) error {
+	if !n.filter.Allowed("fork", "") {
+		return nil
+	}
 	n.send(ctx, formatFork(event))
 	return nil
 }
 
 func (n *notifier) onWorkflowRun(ctx context.Context, _ string, _ string, event *github.WorkflowRunEvent) error {
+	if !n.filter.Allowed("workflow_run", event.GetAction()) {
+		return nil
+	}
 	n.send(ctx, formatWorkflowRun(event))
 	return nil
 }
 
 func (n *notifier) onCreate(ctx context.Context, _ string, _ string, event *github.CreateEvent) error {
+	if !n.filter.Allowed("create", "") {
+		return nil
+	}
 	n.send(ctx, formatCreate(event))
 	return nil
 }
 
 func (n *notifier) onDelete(ctx context.Context, _ string, _ string, event *github.DeleteEvent) error {
+	if !n.filter.Allowed("delete", "") {
+		return nil
+	}
 	n.send(ctx, formatDelete(event))
 	return nil
 }