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notifier_action.go
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notifier_action.go
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package alert
import (
"bytes"
"crypto/sha256"
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"mime/multipart"
"net"
"net/http"
"net/smtp"
"net/textproto"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
"github.com/prometheus/common/model"
"github.com/rancher/norman/httperror"
"github.com/rancher/norman/parse"
"github.com/rancher/norman/types"
"github.com/rancher/norman/types/convert"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
func NotifierCollectionFormatter(apiContext *types.APIContext, collection *types.GenericCollection) {
collection.AddAction(apiContext, "send")
}
func NotifierFormatter(apiContext *types.APIContext, resource *types.RawResource) {
resource.AddAction(apiContext, "send")
}
func (h *Handler) NotifierActionHandler(actionName string, action *types.Action, apiContext *types.APIContext) error {
switch actionName {
case "send":
return h.testNotifier(actionName, action, apiContext)
}
return httperror.NewAPIError(httperror.InvalidAction, "invalid action: "+actionName)
}
func (h *Handler) testNotifier(actionName string, action *types.Action, apiContext *types.APIContext) error {
actionInput, err := parse.ReadBody(apiContext.Request)
if err != nil {
return err
}
msg := ""
msgInf, exist := actionInput["message"]
if exist {
message, ok := msgInf.(string)
if ok {
msg = message
}
}
if apiContext.ID != "" {
parts := strings.Split(apiContext.ID, ":")
ns := parts[0]
id := parts[1]
notifier, err := h.Notifiers.GetNamespaced(ns, id, metav1.GetOptions{})
if err != nil {
return err
}
if notifier.Spec.SlackConfig != nil {
return testSlack(notifier.Spec.SlackConfig.URL, notifier.Spec.SlackConfig.DefaultRecipient, msg)
}
if notifier.Spec.SMTPConfig != nil {
s := notifier.Spec.SMTPConfig
return testEmail(s.Host, s.Password, s.Username, int(s.Port), s.TLS, msg, s.DefaultRecipient, s.Sender)
}
if notifier.Spec.PagerdutyConfig != nil {
return testPagerduty(notifier.Spec.PagerdutyConfig.ServiceKey, msg)
}
if notifier.Spec.WebhookConfig != nil {
return testWebhook(notifier.Spec.WebhookConfig.URL, msg)
}
} else {
slackConfigInterface, exist := actionInput["slackConfig"]
if exist {
slackConfig := convert.ToMapInterface(slackConfigInterface)
url, ok := slackConfig["url"].(string)
if ok {
channel := convert.ToString(slackConfig["defaultRecipient"])
return testSlack(url, channel, msg)
}
}
smtpConfigInterface, exist := actionInput["smtpConfig"]
if exist {
smtpConfig := convert.ToMapInterface(smtpConfigInterface)
host, ok := smtpConfig["host"].(string)
if ok {
port, _ := convert.ToNumber(smtpConfig["port"])
password := convert.ToString(smtpConfig["password"])
username := convert.ToString(smtpConfig["username"])
sender := convert.ToString(smtpConfig["sender"])
receiver := convert.ToString(smtpConfig["defaultRecipient"])
tls := convert.ToBool(smtpConfig["tls"])
return testEmail(host, password, username, int(port), tls, msg, receiver, sender)
}
}
webhookConfigInterface, exist := actionInput["webhookConfig"]
if exist {
webhookConfig := convert.ToMapInterface(webhookConfigInterface)
url, ok := webhookConfig["url"].(string)
if ok {
return testWebhook(url, msg)
}
}
pagerdutyConfigInterface, exist := actionInput["pagerdutyConfig"]
if exist {
pagerdutyConfig := convert.ToMapInterface(pagerdutyConfigInterface)
key, ok := pagerdutyConfig["serviceKey"].(string)
if ok {
return testPagerduty(key, msg)
}
}
return httperror.NewAPIError(httperror.ErrorCode{Status: 400}, "Notifier not configured")
}
return nil
}
type pagerDutyMessage struct {
RoutingKey string `json:"routing_key,omitempty"`
ServiceKey string `json:"service_key,omitempty"`
DedupKey string `json:"dedup_key,omitempty"`
IncidentKey string `json:"incident_key,omitempty"`
EventType string `json:"event_type,omitempty"`
Description string `json:"description,omitempty"`
}
func hashKey(s string) string {
h := sha256.New()
h.Write([]byte(s))
return fmt.Sprintf("%x", h.Sum(nil))
}
func testPagerduty(key, msg string) error {
if msg == "" {
msg = "Pagerduty setting validated"
}
pd := &pagerDutyMessage{
ServiceKey: key,
EventType: "trigger",
IncidentKey: hashKey("key"),
Description: msg,
}
url := "https://events.pagerduty.com/generic/2010-04-15/create_event.json"
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(pd); err != nil {
return err
}
resp, err := http.Post(url, "application/json", &buf)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("http status code is not 200")
}
return nil
}
func testWebhook(url, msg string) error {
if msg == "" {
msg = "Webhook setting validated"
}
alertList := model.Alerts{
&model.Alert{
Labels: map[model.LabelName]model.LabelValue{
model.LabelName("test_msg"): model.LabelValue(msg),
},
},
}
alertData, err := json.Marshal(alertList)
if err != nil {
return err
}
resp, err := http.Post(url, "application/json", bytes.NewBuffer(alertData))
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("http status code is not 200")
}
return nil
}
func testSlack(url, channel, msg string) error {
if msg == "" {
msg = "Slack setting validated"
}
req := struct {
Text string `json:"text"`
Channel string `json:"channel"`
}{}
req.Text = msg
req.Channel = channel
data, err := json.Marshal(req)
if err != nil {
return err
}
resp, err := http.Post(url, "application/json", bytes.NewBuffer(data))
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("http status code is not 200")
}
res, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
if string(res) != "ok" {
return fmt.Errorf("http response is not ok")
}
return nil
}
func testEmail(host, password, username string, port int, requireTLS bool, msg, receiver, sender string) error {
var c *smtp.Client
smartHost := host + ":" + strconv.Itoa(port)
if msg == "" {
msg = "Alert Name: Test SMTP setting"
}
timeout := 15 * time.Second
if port == 465 {
conn, err := tls.DialWithDialer(&net.Dialer{Timeout: timeout}, "tcp", smartHost, &tls.Config{ServerName: host})
if err != nil {
return fmt.Errorf("Failed to connect smtp server: %v", err)
}
c, err = smtp.NewClient(conn, smartHost)
if err != nil {
return fmt.Errorf("Failed to connect smtp server: %v", err)
}
} else {
conn, err := net.DialTimeout("tcp", smartHost, timeout)
if err != nil {
return fmt.Errorf("Failed to connect smtp server: %v", err)
}
c, err = smtp.NewClient(conn, smartHost)
if err != nil {
return fmt.Errorf("Failed to connect smtp server: %v", err)
}
}
defer c.Quit()
if requireTLS {
if ok, _ := c.Extension("STARTTLS"); !ok {
return fmt.Errorf("Require TLS but %q does not advertise the STARTTLS extension", smartHost)
}
tlsConf := &tls.Config{ServerName: host}
if err := c.StartTLS(tlsConf); err != nil {
return fmt.Errorf("Starttls failed: %v", err)
}
}
if ok, mech := c.Extension("AUTH"); ok {
if password != "" && username != "" {
auth, err := auth(mech, username, password)
if err != nil {
return fmt.Errorf("Authentication failed: %v", err)
}
if auth != nil {
if err := c.Auth(auth); err != nil {
return fmt.Errorf("Authentication failed: %v", err)
}
}
}
}
if err := c.Mail(sender); err != nil {
return fmt.Errorf("Failed to set sender: %v", err)
}
if err := c.Rcpt(receiver); err != nil {
return fmt.Errorf("Failed to set recipient: %v", err)
}
wc, err := c.Data()
if err != nil {
return err
}
defer wc.Close()
fmt.Fprintf(wc, "%s: %s\r\n", "From", sender)
fmt.Fprintf(wc, "%s: %s\r\n", "To", receiver)
fmt.Fprintf(wc, "%s: %s\r\n", "Subject", "Alert From Rancher: SMTP configuration validated")
buffer := &bytes.Buffer{}
multipartWriter := multipart.NewWriter(buffer)
fmt.Fprintf(wc, "Date: %s\r\n", time.Now().Format(time.RFC1123Z))
fmt.Fprintf(wc, "Content-Type: multipart/alternative; boundary=%s\r\n", multipartWriter.Boundary())
fmt.Fprintf(wc, "MIME-Version: 1.0\r\n")
fmt.Fprintf(wc, "\r\n")
w, err := multipartWriter.CreatePart(textproto.MIMEHeader{"Content-Type": {"text/html; charset=UTF-8"}})
if err != nil {
return fmt.Errorf("Failed to send test email: %s", err)
}
_, err = w.Write([]byte(msg))
if err != nil {
return fmt.Errorf("Failed to send test email: %s", err)
}
multipartWriter.Close()
_, err = wc.Write(buffer.Bytes())
if err != nil {
return fmt.Errorf("Failed to send test email: %s", err)
}
return nil
}
func auth(mechs string, username, password string) (smtp.Auth, error) {
for _, mech := range strings.Split(mechs, " ") {
switch mech {
case "LOGIN":
if password == "" {
continue
}
return &loginAuth{username, password}, nil
}
}
return nil, fmt.Errorf("smtp server does not support login auth")
}
type loginAuth struct {
username, password string
}
func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
return "LOGIN", []byte{}, nil
}
// Used for AUTH LOGIN. (Maybe password should be encrypted)
func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
if more {
switch strings.ToLower(string(fromServer)) {
case "username:":
return []byte(a.username), nil
case "password:":
return []byte(a.password), nil
default:
return nil, errors.New("unexpected server challenge")
}
}
return nil, nil
}