Add generic webhook integration

internal/integration/webhook/webhook.go

@@ -0,0 +1,64 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package webhook // import "miniflux.app/v2/internal/integration/webhook"
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"miniflux.app/v2/internal/crypto"
+	"miniflux.app/v2/internal/model"
+	"miniflux.app/v2/internal/version"
+)
+
+const defaultClientTimeout = 10 * time.Second
+
+type Client struct {
+	webhookURL    string
+	webhookSecret string
+}
+
+func NewClient(webhookURL, webhookSecret string) *Client {
+	return &Client{webhookURL, webhookSecret}
+}
+
+func (c *Client) SendWebhook(entries model.Entries) error {
+	if c.webhookURL == "" {
+		return fmt.Errorf(`webhook: missing webhook URL`)
+	}
+
+	if len(entries) == 0 {
+		return nil
+	}
+
+	requestBody, err := json.Marshal(entries)
+	if err != nil {
+		return fmt.Errorf("webhook: unable to encode request body: %v", err)
+	}
+
+	request, err := http.NewRequest(http.MethodPost, c.webhookURL, bytes.NewReader(requestBody))
+	if err != nil {
+		return fmt.Errorf("webhook: unable to create request: %v", err)
+	}
+
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("User-Agent", "Miniflux/"+version.Version)
+	request.Header.Set("X-Miniflux-Signature", crypto.GenerateSHA256Hmac(c.webhookSecret, requestBody))
+
+	httpClient := &http.Client{Timeout: defaultClientTimeout}
+	response, err := httpClient.Do(request)
+	if err != nil {
+		return fmt.Errorf("webhook: unable to send request: %v", err)
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode >= 400 {
+		return fmt.Errorf("webhook: incorrect response status code: url=%s status=%d", c.webhookURL, response.StatusCode)
+	}
+
+	return nil
+}