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webhook.go
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webhook.go
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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package target
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/minio/minio/internal/event"
xhttp "github.com/minio/minio/internal/http"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/once"
"github.com/minio/minio/internal/store"
"github.com/minio/pkg/v2/certs"
xnet "github.com/minio/pkg/v2/net"
)
// Webhook constants
const (
WebhookEndpoint = "endpoint"
WebhookAuthToken = "auth_token"
WebhookQueueDir = "queue_dir"
WebhookQueueLimit = "queue_limit"
WebhookClientCert = "client_cert"
WebhookClientKey = "client_key"
EnvWebhookEnable = "MINIO_NOTIFY_WEBHOOK_ENABLE"
EnvWebhookEndpoint = "MINIO_NOTIFY_WEBHOOK_ENDPOINT"
EnvWebhookAuthToken = "MINIO_NOTIFY_WEBHOOK_AUTH_TOKEN"
EnvWebhookQueueDir = "MINIO_NOTIFY_WEBHOOK_QUEUE_DIR"
EnvWebhookQueueLimit = "MINIO_NOTIFY_WEBHOOK_QUEUE_LIMIT"
EnvWebhookClientCert = "MINIO_NOTIFY_WEBHOOK_CLIENT_CERT"
EnvWebhookClientKey = "MINIO_NOTIFY_WEBHOOK_CLIENT_KEY"
)
// WebhookArgs - Webhook target arguments.
type WebhookArgs struct {
Enable bool `json:"enable"`
Endpoint xnet.URL `json:"endpoint"`
AuthToken string `json:"authToken"`
Transport *http.Transport `json:"-"`
QueueDir string `json:"queueDir"`
QueueLimit uint64 `json:"queueLimit"`
ClientCert string `json:"clientCert"`
ClientKey string `json:"clientKey"`
}
// Validate WebhookArgs fields
func (w WebhookArgs) Validate() error {
if !w.Enable {
return nil
}
if w.Endpoint.IsEmpty() {
return errors.New("endpoint empty")
}
if w.QueueDir != "" {
if !filepath.IsAbs(w.QueueDir) {
return errors.New("queueDir path should be absolute")
}
}
if w.ClientCert != "" && w.ClientKey == "" || w.ClientCert == "" && w.ClientKey != "" {
return errors.New("cert and key must be specified as a pair")
}
return nil
}
// WebhookTarget - Webhook target.
type WebhookTarget struct {
initOnce once.Init
id event.TargetID
args WebhookArgs
transport *http.Transport
httpClient *http.Client
store store.Store[event.Event]
loggerOnce logger.LogOnce
cancel context.CancelFunc
cancelCh <-chan struct{}
addr string // full address ip/dns with a port number, e.g. x.x.x.x:8080
}
// ID - returns target ID.
func (target *WebhookTarget) ID() event.TargetID {
return target.id
}
// Name - returns the Name of the target.
func (target *WebhookTarget) Name() string {
return target.ID().String()
}
// IsActive - Return true if target is up and active
func (target *WebhookTarget) IsActive() (bool, error) {
if err := target.init(); err != nil {
return false, err
}
return target.isActive()
}
// Store returns any underlying store if set.
func (target *WebhookTarget) Store() event.TargetStore {
return target.store
}
func (target *WebhookTarget) isActive() (bool, error) {
conn, err := net.DialTimeout("tcp", target.addr, 5*time.Second)
if err != nil {
if xnet.IsNetworkOrHostDown(err, false) {
return false, store.ErrNotConnected
}
return false, err
}
defer conn.Close()
return true, nil
}
// Save - saves the events to the store if queuestore is configured,
// which will be replayed when the webhook connection is active.
func (target *WebhookTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
if err := target.init(); err != nil {
return err
}
err := target.send(eventData)
if err != nil {
if xnet.IsNetworkOrHostDown(err, false) {
return store.ErrNotConnected
}
}
return err
}
// send - sends an event to the webhook.
func (target *WebhookTarget) send(eventData event.Event) error {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return err
}
key := eventData.S3.Bucket.Name + "/" + objectName
data, err := json.Marshal(event.Log{EventName: eventData.EventName, Key: key, Records: []event.Event{eventData}})
if err != nil {
return err
}
req, err := http.NewRequest(http.MethodPost, target.args.Endpoint.String(), bytes.NewReader(data))
if err != nil {
return err
}
// Verify if the authToken already contains
// <Key> <Token> like format, if this is
// already present we can blindly use the
// authToken as is instead of adding 'Bearer'
tokens := strings.Fields(target.args.AuthToken)
switch len(tokens) {
case 2:
req.Header.Set("Authorization", target.args.AuthToken)
case 1:
req.Header.Set("Authorization", "Bearer "+target.args.AuthToken)
}
req.Header.Set("Content-Type", "application/json")
resp, err := target.httpClient.Do(req)
if err != nil {
return err
}
defer xhttp.DrainBody(resp.Body)
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return fmt.Errorf("sending event failed with %v", resp.Status)
}
return nil
}
// SendFromStore - reads an event from store and sends it to webhook.
func (target *WebhookTarget) SendFromStore(key store.Key) error {
if err := target.init(); err != nil {
return err
}
eventData, eErr := target.store.Get(key.Name)
if eErr != nil {
// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
// Such events will not exist and would've been already been sent successfully.
if os.IsNotExist(eErr) {
return nil
}
return eErr
}
if err := target.send(eventData); err != nil {
if xnet.IsNetworkOrHostDown(err, false) {
return store.ErrNotConnected
}
return err
}
// Delete the event from store.
return target.store.Del(key.Name)
}
// Close - does nothing and available for interface compatibility.
func (target *WebhookTarget) Close() error {
target.cancel()
return nil
}
func (target *WebhookTarget) init() error {
return target.initOnce.Do(target.initWebhook)
}
// Only called from init()
func (target *WebhookTarget) initWebhook() error {
args := target.args
transport := target.transport
if args.ClientCert != "" && args.ClientKey != "" {
manager, err := certs.NewManager(context.Background(), args.ClientCert, args.ClientKey, tls.LoadX509KeyPair)
if err != nil {
return err
}
manager.ReloadOnSignal(syscall.SIGHUP) // allow reloads upon SIGHUP
transport.TLSClientConfig.GetClientCertificate = manager.GetClientCertificate
}
target.httpClient = &http.Client{Transport: transport}
yes, err := target.isActive()
if err != nil {
return err
}
if !yes {
return store.ErrNotConnected
}
return nil
}
// NewWebhookTarget - creates new Webhook target.
func NewWebhookTarget(ctx context.Context, id string, args WebhookArgs, loggerOnce logger.LogOnce, transport *http.Transport) (*WebhookTarget, error) {
ctx, cancel := context.WithCancel(ctx)
var queueStore store.Store[event.Event]
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-webhook-"+id)
queueStore = store.NewQueueStore[event.Event](queueDir, args.QueueLimit, event.StoreExtension)
if err := queueStore.Open(); err != nil {
cancel()
return nil, fmt.Errorf("unable to initialize the queue store of Webhook `%s`: %w", id, err)
}
}
target := &WebhookTarget{
id: event.TargetID{ID: id, Name: "webhook"},
args: args,
loggerOnce: loggerOnce,
transport: transport,
store: queueStore,
cancel: cancel,
cancelCh: ctx.Done(),
}
// Calculate the webhook addr with the port number format
target.addr = args.Endpoint.Host
if _, _, err := net.SplitHostPort(args.Endpoint.Host); err != nil && strings.Contains(err.Error(), "missing port in address") {
switch strings.ToLower(args.Endpoint.Scheme) {
case "http":
target.addr += ":80"
case "https":
target.addr += ":443"
default:
return nil, errors.New("unsupported scheme")
}
}
if target.store != nil {
store.StreamItems(target.store, target, target.cancelCh, target.loggerOnce)
}
return target, nil
}