Pierre-Olivier Mercier
c3b5d3a97c
Implement ChannelSender interface with three backends: - EmailSender: reuses existing Mailer, sends Markdown-formatted alerts - WebhookSender: HTTP POST with JSON payload and optional HMAC signature - UnifiedPushSender: HTTP POST following the UnifiedPush protocol Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
// This file is part of the happyDomain (R) project.
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// Copyright (c) 2020-2026 happyDomain
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// Authors: Pierre-Olivier Mercier, et al.
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//
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// This program is offered under a commercial and under the AGPL license.
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// For commercial licensing, contact us at <contact@happydomain.org>.
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//
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// For AGPL licensing:
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package notification
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import (
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"bytes"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"time"
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"git.happydns.org/happyDomain/model"
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)
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// WebhookPayload is the JSON body sent to webhook endpoints.
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type WebhookPayload struct {
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Event string `json:"event"`
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Checker string `json:"checker"`
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Domain string `json:"domain"`
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Target happydns.CheckTarget `json:"target"`
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OldStatus happydns.Status `json:"oldStatus"`
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NewStatus happydns.Status `json:"newStatus"`
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States []happydns.CheckState `json:"states,omitempty"`
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Timestamp time.Time `json:"timestamp"`
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DashboardURL string `json:"dashboardUrl,omitempty"`
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}
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// WebhookSender sends notifications via HTTP POST to a configured URL.
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type WebhookSender struct {
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client *http.Client
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}
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// NewWebhookSender creates a new WebhookSender.
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func NewWebhookSender() *WebhookSender {
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return &WebhookSender{
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client: &http.Client{Timeout: 10 * time.Second},
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}
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}
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func (s *WebhookSender) Send(channel *happydns.NotificationChannel, payload *NotificationPayload) error {
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if channel.Config.WebhookURL == "" {
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return fmt.Errorf("no webhook URL configured for channel %s", channel.Id)
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}
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whPayload := WebhookPayload{
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Event: "status_change",
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Checker: payload.CheckerID,
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Domain: payload.DomainName,
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Target: payload.Target,
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OldStatus: payload.OldStatus,
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NewStatus: payload.NewStatus,
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States: payload.States,
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Timestamp: time.Now(),
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}
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if payload.BaseURL != "" {
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whPayload.DashboardURL = payload.BaseURL
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}
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body, err := json.Marshal(whPayload)
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if err != nil {
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return fmt.Errorf("marshaling webhook payload: %w", err)
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}
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req, err := http.NewRequest(http.MethodPost, channel.Config.WebhookURL, bytes.NewReader(body))
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if err != nil {
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return fmt.Errorf("creating webhook request: %w", err)
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("User-Agent", "happyDomain-Notification/1.0")
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for k, v := range channel.Config.WebhookHeaders {
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req.Header.Set(k, v)
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}
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if channel.Config.WebhookSecret != "" {
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mac := hmac.New(sha256.New, []byte(channel.Config.WebhookSecret))
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mac.Write(body)
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sig := hex.EncodeToString(mac.Sum(nil))
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req.Header.Set("X-Happydomain-Signature", "sha256="+sig)
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}
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resp, err := s.client.Do(req)
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if err != nil {
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return fmt.Errorf("sending webhook: %w", err)
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}
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defer resp.Body.Close()
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io.Copy(io.Discard, resp.Body)
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if resp.StatusCode >= 300 {
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return fmt.Errorf("webhook returned status %d", resp.StatusCode)
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}
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return nil
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}
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