Initial Notifiers implementation

notifications/webhook.go

@@ -0,0 +1,82 @@
+package notifications
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+)
+
+const (
+	webhookTag             = "webhook"
+	webhookRequestTypeJson = "JSON"
+	envWebhookUrl          = "WEBHOOK_RL"
+	envWebhookRequestType  = "WEBHOOK_REQ_TYPE"
+)
+
+type Doer interface {
+	Do(*http.Request) (*http.Response, error)
+}
+
+type WebhookConfig struct {
+	Url  string
+	Json bool
+}
+
+func NewWebhookConfigFromEnv() WebhookConfig {
+	return WebhookConfig{
+		Url:  os.Getenv(envWebhookUrl),
+		Json: strings.ToUpper(os.Getenv(envWebhookRequestType)) == webhookRequestTypeJson,
+	}
+}
+
+type WebhookNotification struct {
+	config WebhookConfig
+	client Doer
+}
+
+func (w WebhookNotification) Tag() string {
+	return webhookTag
+}
+
+func NewWebhookNotification(config WebhookConfig, client Doer) *WebhookNotification {
+	return &WebhookNotification{config: config, client: client}
+}
+
+func (w WebhookNotification) getRequestBody(notification Notification) (io.Reader, error) {
+	out := bytes.NewBuffer(notification.NewIp)
+	if w.config.Json {
+		if err := json.NewEncoder(out).Encode(notification); err != nil {
+			return nil, fmt.Errorf("error encoding notification body: %w", err)
+		}
+		return out, nil
+	}
+	return out, nil
+}
+
+func (w WebhookNotification) Notify(ctx context.Context, notification Notification) error {
+	body, err := w.getRequestBody(notification)
+	if err != nil {
+		return fmt.Errorf("WebhookNotification::NotifyWithLog error: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, w.config.Url, body)
+	if err != nil {
+		return fmt.Errorf("WebhookNotification::NotifyWithLog error creating request: %w", err)
+	}
+
+	resp, err := w.client.Do(req)
+	if err != nil {
+		return fmt.Errorf("WebhookNotification::NotifyWithLog error while sending notification: %w", err)
+	}
+	_ = resp.Body.Close()
+
+	if resp.StatusCode >= 300 {
+		return fmt.Errorf("WebhookNotification::NotifyWithLog unexpected non 2xx code %d returned", resp.StatusCode)
+	}
+	return nil
+}