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/*
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* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package target
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"github.com/minio/minio/pkg/event"
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xnet "github.com/minio/minio/pkg/net"
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)
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// Webhook constants
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const (
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WebhookEndpoint = "endpoint"
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WebhookAuthToken = "auth_token"
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WebhookQueueDir = "queue_dir"
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WebhookQueueLimit = "queue_limit"
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EnvWebhookEnable = "MINIO_NOTIFY_WEBHOOK_ENABLE"
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EnvWebhookEndpoint = "MINIO_NOTIFY_WEBHOOK_ENDPOINT"
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EnvWebhookAuthToken = "MINIO_NOTIFY_WEBHOOK_AUTH_TOKEN"
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EnvWebhookQueueDir = "MINIO_NOTIFY_WEBHOOK_QUEUE_DIR"
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EnvWebhookQueueLimit = "MINIO_NOTIFY_WEBHOOK_QUEUE_LIMIT"
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)
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// WebhookArgs - Webhook target arguments.
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type WebhookArgs struct {
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Enable bool `json:"enable"`
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Endpoint xnet.URL `json:"endpoint"`
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AuthToken string `json:"authToken"`
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Transport *http.Transport `json:"-"`
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QueueDir string `json:"queueDir"`
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QueueLimit uint64 `json:"queueLimit"`
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}
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// Validate WebhookArgs fields
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func (w WebhookArgs) Validate() error {
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if !w.Enable {
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return nil
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}
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if w.Endpoint.IsEmpty() {
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return errors.New("endpoint empty")
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}
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if w.QueueDir != "" {
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if !filepath.IsAbs(w.QueueDir) {
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return errors.New("queueDir path should be absolute")
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}
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}
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if w.QueueLimit > maxLimit {
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return errors.New("queueLimit should not exceed 10000")
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}
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return nil
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}
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// WebhookTarget - Webhook target.
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type WebhookTarget struct {
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id event.TargetID
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args WebhookArgs
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httpClient *http.Client
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store Store
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}
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// ID - returns target ID.
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func (target WebhookTarget) ID() event.TargetID {
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return target.id
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}
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// IsActive - Return true if target is up and active
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func (target *WebhookTarget) IsActive() (bool, error) {
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u, pErr := xnet.ParseHTTPURL(target.args.Endpoint.String())
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if pErr != nil {
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return false, pErr
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}
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if dErr := u.DialHTTP(); dErr != nil {
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if xnet.IsNetworkOrHostDown(dErr) {
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return false, errNotConnected
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}
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return false, dErr
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}
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return true, nil
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}
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// Save - saves the events to the store if queuestore is configured, which will be replayed when the wenhook connection is active.
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func (target *WebhookTarget) Save(eventData event.Event) error {
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if target.store != nil {
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return target.store.Put(eventData)
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}
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_, err := target.IsActive()
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if err != nil {
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return err
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}
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return target.send(eventData)
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}
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// send - sends an event to the webhook.
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func (target *WebhookTarget) send(eventData event.Event) error {
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objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
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if err != nil {
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return err
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}
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key := eventData.S3.Bucket.Name + "/" + objectName
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data, err := json.Marshal(event.Log{EventName: eventData.EventName, Key: key, Records: []event.Event{eventData}})
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if err != nil {
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return err
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}
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req, err := http.NewRequest("POST", target.args.Endpoint.String(), bytes.NewReader(data))
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if err != nil {
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return err
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}
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if target.args.AuthToken != "" {
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req.Header.Set("Authorization", "Bearer "+target.args.AuthToken)
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}
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req.Header.Set("Content-Type", "application/json")
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resp, err := target.httpClient.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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io.Copy(ioutil.Discard, resp.Body)
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if resp.StatusCode < 200 || resp.StatusCode > 299 {
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// close any idle connections upon any error.
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target.httpClient.CloseIdleConnections()
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return fmt.Errorf("sending event failed with %v", resp.Status)
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}
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return nil
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}
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// Send - reads an event from store and sends it to webhook.
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func (target *WebhookTarget) Send(eventKey string) error {
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_, err := target.IsActive()
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if err != nil {
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return err
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}
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eventData, eErr := target.store.Get(eventKey)
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if eErr != nil {
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// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
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// Such events will not exist and would've been already been sent successfully.
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if os.IsNotExist(eErr) {
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return nil
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}
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return eErr
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}
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if err := target.send(eventData); err != nil {
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if xnet.IsNetworkOrHostDown(err) {
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return errNotConnected
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}
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return err
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}
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// Delete the event from store.
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return target.store.Del(eventKey)
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}
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// Close - does nothing and available for interface compatibility.
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func (target *WebhookTarget) Close() error {
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return nil
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}
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// NewWebhookTarget - creates new Webhook target.
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func NewWebhookTarget(id string, args WebhookArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), transport *http.Transport) (*WebhookTarget, error) {
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var store Store
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if args.QueueDir != "" {
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queueDir := filepath.Join(args.QueueDir, storePrefix+"-webhook-"+id)
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store = NewQueueStore(queueDir, args.QueueLimit)
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if err := store.Open(); err != nil {
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return nil, err
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}
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}
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target := &WebhookTarget{
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id: event.TargetID{ID: id, Name: "webhook"},
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args: args,
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httpClient: &http.Client{
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Transport: transport,
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},
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store: store,
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}
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if target.store != nil {
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// Replays the events from the store.
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eventKeyCh := replayEvents(target.store, doneCh, loggerOnce, target.ID())
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// Start replaying events from the store.
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go sendEvents(target, eventKeyCh, doneCh, loggerOnce)
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}
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return target, nil
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}
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