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261 lines (229 loc) · 7.34 KB
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/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package target
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"path/filepath"
"time"
"github.com/minio/minio/pkg/certs"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/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 {
id event.TargetID
args WebhookArgs
httpClient *http.Client
store Store
loggerOnce func(ctx context.Context, err error, id interface{}, errKind ...interface{})
}
// ID - returns target ID.
func (target WebhookTarget) ID() event.TargetID {
return target.id
}
// HasQueueStore - Checks if the queueStore has been configured for the target
func (target *WebhookTarget) HasQueueStore() bool {
return target.store != nil
}
// IsActive - Return true if target is up and active
func (target *WebhookTarget) IsActive() (bool, error) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
req, err := http.NewRequestWithContext(ctx, http.MethodHead, target.args.Endpoint.String(), nil)
if err != nil {
if xnet.IsNetworkOrHostDown(err, false) {
return false, errNotConnected
}
return false, err
}
resp, err := target.httpClient.Do(req)
if err != nil {
if xnet.IsNetworkOrHostDown(err, false) || errors.Is(err, context.DeadlineExceeded) {
return false, errNotConnected
}
return false, err
}
io.Copy(ioutil.Discard, resp.Body)
resp.Body.Close()
// No network failure i.e response from the target means its up
return true, nil
}
// Save - saves the events to the store if queuestore is configured, which will be replayed when the wenhook connection is active.
func (target *WebhookTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
err := target.send(eventData)
if err != nil {
if xnet.IsNetworkOrHostDown(err, false) {
return 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("POST", target.args.Endpoint.String(), bytes.NewReader(data))
if err != nil {
return err
}
if target.args.AuthToken != "" {
req.Header.Set("Authorization", "Bearer "+target.args.AuthToken)
}
req.Header.Set("Content-Type", "application/json")
resp, err := target.httpClient.Do(req)
if err != nil {
target.Close()
return err
}
defer resp.Body.Close()
io.Copy(ioutil.Discard, resp.Body)
if resp.StatusCode < 200 || resp.StatusCode > 299 {
target.Close()
return fmt.Errorf("sending event failed with %v", resp.Status)
}
return nil
}
// Send - reads an event from store and sends it to webhook.
func (target *WebhookTarget) Send(eventKey string) error {
eventData, eErr := target.store.Get(eventKey)
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 errNotConnected
}
return err
}
// Delete the event from store.
return target.store.Del(eventKey)
}
// Close - does nothing and available for interface compatibility.
func (target *WebhookTarget) Close() error {
// Close idle connection with "keep-alive" states
target.httpClient.CloseIdleConnections()
return nil
}
// NewWebhookTarget - creates new Webhook target.
func NewWebhookTarget(ctx context.Context, id string, args WebhookArgs, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), transport *http.Transport, test bool) (*WebhookTarget, error) {
var store Store
target := &WebhookTarget{
id: event.TargetID{ID: id, Name: "webhook"},
args: args,
loggerOnce: loggerOnce,
}
if target.args.ClientCert != "" && target.args.ClientKey != "" {
manager, err := certs.NewManager(ctx, target.args.ClientCert, target.args.ClientKey, tls.LoadX509KeyPair)
if err != nil {
return target, err
}
transport.TLSClientConfig.GetClientCertificate = manager.GetClientCertificate
}
target.httpClient = &http.Client{Transport: transport}
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-webhook-"+id)
store = NewQueueStore(queueDir, args.QueueLimit)
if err := store.Open(); err != nil {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
target.store = store
}
_, err := target.IsActive()
if err != nil {
if target.store == nil || err != errNotConnected {
target.loggerOnce(ctx, err, target.ID())
return target, err
}
}
if target.store != nil && !test {
// Replays the events from the store.
eventKeyCh := replayEvents(target.store, ctx.Done(), target.loggerOnce, target.ID())
// Start replaying events from the store.
go sendEvents(target, eventKeyCh, ctx.Done(), target.loggerOnce)
}
return target, nil
}