feat(notify): Telegram/Webhook нотификаторы + Dispatcher по каналам проекта

internal/notify/dispatch.go

@@ -0,0 +1,75 @@
+package notify
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/vasyakrg/dns-autoresolver/internal/store"
+)
+
+// ChannelStore is the narrow store dependency Dispatcher needs: the set of
+// enabled notification channels for a project.
+type ChannelStore interface {
+	ListEnabledChannels(ctx context.Context, projectID uuid.UUID) ([]store.Channel, error)
+}
+
+// Decryptor decrypts a channel's stored secret (bot token, signing key, ...).
+type Decryptor interface {
+	Decrypt(enc string) ([]byte, error)
+}
+
+// Dispatcher fans an Event out to every enabled channel of a project,
+// picking the Notifier implementation by channel type. A failure on one
+// channel does not stop delivery to the others; all errors are aggregated
+// via errors.Join.
+type Dispatcher struct {
+	store  ChannelStore
+	cipher Decryptor
+	byType map[string]Notifier
+}
+
+// NewDispatcher builds a Dispatcher wired with the default Telegram and
+// Webhook notifiers.
+func NewDispatcher(store ChannelStore, cipher Decryptor) *Dispatcher {
+	return &Dispatcher{
+		store:  store,
+		cipher: cipher,
+		byType: map[string]Notifier{
+			"telegram": &Telegram{BaseURL: "https://api.telegram.org", HTTP: &http.Client{Timeout: 15 * time.Second}},
+			"webhook":  &Webhook{HTTP: &http.Client{Timeout: 15 * time.Second}},
+		},
+	}
+}
+
+// Send delivers ev to every enabled channel of projectID. Errors from
+// individual channels are aggregated (via errors.Join) rather than aborting
+// delivery to the remaining channels.
+func (d *Dispatcher) Send(ctx context.Context, projectID uuid.UUID, ev Event) error {
+	channels, err := d.store.ListEnabledChannels(ctx, projectID)
+	if err != nil {
+		return err
+	}
+	var errs []error
+	for _, ch := range channels {
+		n, ok := d.byType[ch.Type]
+		if !ok {
+			continue
+		}
+		secret := ""
+		if ch.SecretEnc != "" {
+			b, err := d.cipher.Decrypt(ch.SecretEnc)
+			if err != nil {
+				errs = append(errs, err)
+				continue
+			}
+			secret = string(b)
+		}
+		if err := n.Send(ctx, ch.Config, secret, ev); err != nil {
+			errs = append(errs, err)
+		}
+	}
+	return errors.Join(errs...)
+}

internal/notify/notify.go

@@ -0,0 +1,27 @@
+// Package notify sends drift/error notifications to project-configured
+// channels (Telegram, generic webhooks, ...). Notifier implementations must
+// never log the secret they receive (bot tokens, HMAC keys, etc.).
+package notify
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+)
+
+// Event describes a single notification-worthy occurrence for a domain
+// belonging to a project (e.g. a status change detected by the scheduler).
+type Event struct {
+	Project string
+	Domain  string
+	Status  string
+	Summary string
+	At      time.Time
+}
+
+// Notifier delivers an Event to a channel described by cfg (channel-type
+// specific JSON config) and secret (decrypted credential, e.g. a bot token).
+// Implementations must not log secret.
+type Notifier interface {
+	Send(ctx context.Context, cfg json.RawMessage, secret string, ev Event) error
+}

internal/notify/notify_test.go

@@ -0,0 +1,217 @@
+package notify
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/vasyakrg/dns-autoresolver/internal/store"
+)
+
+func TestTelegramSendSuccess(t *testing.T) {
+	var gotPath string
+	var gotBody map[string]string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotPath = r.URL.Path
+		_ = json.NewDecoder(r.Body).Decode(&gotBody)
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer srv.Close()
+
+	tg := &Telegram{BaseURL: srv.URL, HTTP: srv.Client()}
+	ev := Event{Project: "proj", Domain: "example.com", Status: "drift", Summary: "A record changed", At: time.Now()}
+
+	err := tg.Send(context.Background(), json.RawMessage(`{"chat_id":"12345"}`), "sekret-token", ev)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if gotPath != "/botsekret-token/sendMessage" {
+		t.Fatalf("unexpected path: %s", gotPath)
+	}
+	if gotBody["chat_id"] != "12345" {
+		t.Fatalf("unexpected chat_id: %+v", gotBody)
+	}
+	if !strings.Contains(gotBody["text"], "example.com") || !strings.Contains(gotBody["text"], "drift") {
+		t.Fatalf("unexpected text: %+v", gotBody)
+	}
+}
+
+func TestTelegramSendServerError(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+	}))
+	defer srv.Close()
+
+	tg := &Telegram{BaseURL: srv.URL, HTTP: srv.Client()}
+	ev := Event{Project: "proj", Domain: "example.com", Status: "drift", Summary: "x", At: time.Now()}
+
+	if err := tg.Send(context.Background(), json.RawMessage(`{"chat_id":"1"}`), "tok", ev); err == nil {
+		t.Fatal("expected error on 500 response")
+	}
+}
+
+func TestWebhookSendSuccess(t *testing.T) {
+	var gotEvent Event
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			t.Errorf("unexpected method: %s", r.Method)
+		}
+		_ = json.NewDecoder(r.Body).Decode(&gotEvent)
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer srv.Close()
+
+	wh := &Webhook{HTTP: srv.Client()}
+	ev := Event{Project: "proj", Domain: "example.com", Status: "in_sync", Summary: "resolved", At: time.Now()}
+
+	cfg, _ := json.Marshal(map[string]string{"url": srv.URL})
+	if err := wh.Send(context.Background(), cfg, "", ev); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if gotEvent.Domain != "example.com" || gotEvent.Status != "in_sync" {
+		t.Fatalf("unexpected event delivered: %+v", gotEvent)
+	}
+}
+
+func TestWebhookSendNonSuccessStatus(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusBadRequest)
+	}))
+	defer srv.Close()
+
+	wh := &Webhook{HTTP: srv.Client()}
+	ev := Event{Project: "proj", Domain: "example.com", Status: "drift", Summary: "x", At: time.Now()}
+	cfg, _ := json.Marshal(map[string]string{"url": srv.URL})
+
+	if err := wh.Send(context.Background(), cfg, "", ev); err == nil {
+		t.Fatal("expected error on 400 response")
+	}
+}
+
+// --- Dispatcher ---
+
+type mockChannelStore struct {
+	channels []store.Channel
+	err      error
+}
+
+func (m *mockChannelStore) ListEnabledChannels(ctx context.Context, projectID uuid.UUID) ([]store.Channel, error) {
+	return m.channels, m.err
+}
+
+type mockDecryptor struct {
+	fail bool
+}
+
+func (m *mockDecryptor) Decrypt(enc string) ([]byte, error) {
+	if m.fail {
+		return nil, errBoom
+	}
+	return []byte("decrypted-" + enc), nil
+}
+
+var errBoom = &boomErr{}
+
+type boomErr struct{}
+
+func (*boomErr) Error() string { return "decrypt boom" }
+
+func TestDispatcherSendsToAllChannelsAndAggregatesErrors(t *testing.T) {
+	var tgCalled, whCalled bool
+	var tgSecret string
+
+	tgSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		tgCalled = true
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer tgSrv.Close()
+
+	whSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		whCalled = true
+		w.WriteHeader(http.StatusInternalServerError) // webhook fails
+	}))
+	defer whSrv.Close()
+
+	projectID := uuid.New()
+	channels := []store.Channel{
+		{
+			ID: uuid.New(), ProjectID: projectID, Type: "telegram",
+			Config: json.RawMessage(`{"chat_id":"1"}`), SecretEnc: "enc-token", Enabled: true,
+		},
+		{
+			ID: uuid.New(), ProjectID: projectID, Type: "webhook",
+			Config: json.RawMessage(`{"url":"` + whSrv.URL + `"}`), SecretEnc: "", Enabled: true,
+		},
+	}
+
+	d := NewDispatcher(&mockChannelStore{channels: channels}, &mockDecryptor{})
+	// Redirect telegram to the httptest server and capture the decrypted secret.
+	d.byType["telegram"] = notifierFunc(func(ctx context.Context, cfg json.RawMessage, secret string, ev Event) error {
+		tgSecret = secret
+		tg := &Telegram{BaseURL: tgSrv.URL, HTTP: tgSrv.Client()}
+		return tg.Send(ctx, cfg, secret, ev)
+	})
+
+	ev := Event{Project: "proj", Domain: "example.com", Status: "drift", Summary: "changed", At: time.Now()}
+	err := d.Send(context.Background(), projectID, ev)
+
+	if !tgCalled {
+		t.Error("expected telegram notifier to be called")
+	}
+	if !whCalled {
+		t.Error("expected webhook notifier to be called")
+	}
+	if err == nil {
+		t.Fatal("expected aggregated error because webhook failed")
+	}
+	if tgSecret != "decrypted-enc-token" {
+		t.Fatalf("expected decrypted secret to be passed to telegram, got %q", tgSecret)
+	}
+}
+
+func TestDispatcherSkipsUnknownChannelType(t *testing.T) {
+	projectID := uuid.New()
+	channels := []store.Channel{
+		{ID: uuid.New(), ProjectID: projectID, Type: "carrier-pigeon", Config: json.RawMessage(`{}`), Enabled: true},
+	}
+	d := NewDispatcher(&mockChannelStore{channels: channels}, &mockDecryptor{})
+	if err := d.Send(context.Background(), projectID, Event{Project: "p", Domain: "d", Status: "drift"}); err != nil {
+		t.Fatalf("unexpected error for unknown channel type: %v", err)
+	}
+}
+
+func TestDispatcherDecryptFailureIsAggregatedNotFatal(t *testing.T) {
+	var whCalled bool
+	whSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		whCalled = true
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer whSrv.Close()
+
+	projectID := uuid.New()
+	channels := []store.Channel{
+		{ID: uuid.New(), ProjectID: projectID, Type: "telegram", Config: json.RawMessage(`{"chat_id":"1"}`), SecretEnc: "enc", Enabled: true},
+		{ID: uuid.New(), ProjectID: projectID, Type: "webhook", Config: json.RawMessage(`{"url":"` + whSrv.URL + `"}`), Enabled: true},
+	}
+	d := NewDispatcher(&mockChannelStore{channels: channels}, &mockDecryptor{fail: true})
+
+	err := d.Send(context.Background(), projectID, Event{Project: "p", Domain: "d", Status: "drift"})
+	if err == nil {
+		t.Fatal("expected error due to decrypt failure")
+	}
+	if !whCalled {
+		t.Error("expected webhook channel to still be attempted after telegram decrypt failure")
+	}
+}
+
+// notifierFunc adapts a function to the Notifier interface for tests.
+type notifierFunc func(ctx context.Context, cfg json.RawMessage, secret string, ev Event) error
+
+func (f notifierFunc) Send(ctx context.Context, cfg json.RawMessage, secret string, ev Event) error {
+	return f(ctx, cfg, secret, ev)
+}

internal/notify/telegram.go

@@ -0,0 +1,45 @@
+package notify
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+// Telegram delivers notifications via the Telegram Bot API sendMessage
+// endpoint. Config is {"chat_id": "..."}; secret is the bot token and is
+// never logged.
+type Telegram struct {
+	BaseURL string
+	HTTP    *http.Client
+}
+
+func (t *Telegram) Send(ctx context.Context, cfg json.RawMessage, secret string, ev Event) error {
+	var c struct {
+		ChatID string `json:"chat_id"`
+	}
+	if err := json.Unmarshal(cfg, &c); err != nil {
+		return err
+	}
+	body, _ := json.Marshal(map[string]string{
+		"chat_id": c.ChatID,
+		"text":    fmt.Sprintf("[%s] %s → %s\n%s", ev.Project, ev.Domain, ev.Status, ev.Summary),
+	})
+	url := t.BaseURL + "/bot" + secret + "/sendMessage"
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := t.HTTP.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 300 {
+		return fmt.Errorf("telegram: status %d", resp.StatusCode)
+	}
+	return nil
+}

internal/notify/webhook.go

@@ -0,0 +1,43 @@
+package notify
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+// Webhook delivers notifications as a JSON POST of the Event to a
+// project-configured URL. Config is {"url": "..."}. secret is currently
+// unused (reserved for future request signing) and is never logged.
+type Webhook struct {
+	HTTP *http.Client
+}
+
+func (w *Webhook) Send(ctx context.Context, cfg json.RawMessage, secret string, ev Event) error {
+	var c struct {
+		URL string `json:"url"`
+	}
+	if err := json.Unmarshal(cfg, &c); err != nil {
+		return err
+	}
+	body, err := json.Marshal(ev)
+	if err != nil {
+		return err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.URL, bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := w.HTTP.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return fmt.Errorf("webhook: status %d", resp.StatusCode)
+	}
+	return nil
+}