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minio/cmd/bucket-notification-handler...

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/*
* MinIO Cloud Storage, (C) 2016, 2017, 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 cmd
import (
"encoding/json"
"encoding/xml"
"errors"
"io"
"net/http"
"path"
"reflect"
"time"
"github.com/gorilla/mux"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/bucket/policy"
"github.com/minio/minio/pkg/event"
)
const (
bucketConfigPrefix = "buckets"
bucketNotificationConfig = "notification.xml"
)
var errNoSuchNotifications = errors.New("The specified bucket does not have bucket notifications")
// GetBucketNotificationHandler - This HTTP handler returns event notification configuration
// as per http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html.
// It returns empty configuration if its not set.
func (api objectAPIHandlers) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "GetBucketNotification")
defer logger.AuditLog(w, r, "GetBucketNotification", mustGetClaimsFromToken(r))
vars := mux.Vars(r)
bucketName := vars["bucket"]
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL, guessIsBrowserReq(r))
return
}
if !objAPI.IsNotificationSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
return
}
if s3Error := checkRequestAuthType(ctx, r, policy.GetBucketNotificationAction, bucketName, ""); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL, guessIsBrowserReq(r))
return
}
_, err := objAPI.GetBucketInfo(ctx, bucketName)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
// Construct path to notification.xml for the given bucket.
configFile := path.Join(bucketConfigPrefix, bucketName, bucketNotificationConfig)
var config = event.Config{}
configData, err := readConfig(ctx, objAPI, configFile)
if err != nil {
if err != errConfigNotFound {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
config.SetRegion(globalServerRegion)
config.XMLNS = "http://s3.amazonaws.com/doc/2006-03-01/"
notificationBytes, err := xml.Marshal(config)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
writeSuccessResponseXML(w, notificationBytes)
return
}
config.SetRegion(globalServerRegion)
if err = xml.Unmarshal(configData, &config); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
if err = config.Validate(globalServerRegion, globalNotificationSys.targetList); err != nil {
arnErr, ok := err.(*event.ErrARNNotFound)
if !ok {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
for i, queue := range config.QueueList {
// Remove ARN not found queues, because we previously allowed
// adding unexpected entries into the config.
//
// With newer config disallowing changing / turning off
// notification targets without removing ARN in notification
// configuration we won't see this problem anymore.
if reflect.DeepEqual(queue.ARN, arnErr.ARN) && i < len(config.QueueList) {
config.QueueList = append(config.QueueList[:i],
config.QueueList[i+1:]...)
}
// This is a one time activity we shall do this
// here and allow stale ARN to be removed. We shall
// never reach a stage where we will have stale
// notification configs.
}
}
// If xml namespace is empty, set a default value before returning.
if config.XMLNS == "" {
config.XMLNS = "http://s3.amazonaws.com/doc/2006-03-01/"
}
notificationBytes, err := xml.Marshal(config)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
writeSuccessResponseXML(w, notificationBytes)
}
// PutBucketNotificationHandler - This HTTP handler stores given notification configuration as per
// http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html.
func (api objectAPIHandlers) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "PutBucketNotification")
defer logger.AuditLog(w, r, "PutBucketNotification", mustGetClaimsFromToken(r))
objectAPI := api.ObjectAPI()
if objectAPI == nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL, guessIsBrowserReq(r))
return
}
if !objectAPI.IsNotificationSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
return
}
vars := mux.Vars(r)
bucketName := vars["bucket"]
if s3Error := checkRequestAuthType(ctx, r, policy.PutBucketNotificationAction, bucketName, ""); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL, guessIsBrowserReq(r))
return
}
_, err := objectAPI.GetBucketInfo(ctx, bucketName)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
// PutBucketNotification always needs a Content-Length.
if r.ContentLength <= 0 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingContentLength), r.URL, guessIsBrowserReq(r))
return
}
lreader := io.LimitReader(r.Body, r.ContentLength)
config, err := event.ParseConfig(lreader, globalServerRegion, globalNotificationSys.targetList)
if err != nil {
apiErr := errorCodes.ToAPIErr(ErrMalformedXML)
if event.IsEventError(err) {
apiErr = toAPIError(ctx, err)
}
writeErrorResponse(ctx, w, apiErr, r.URL, guessIsBrowserReq(r))
return
}
if err = saveNotificationConfig(ctx, objectAPI, bucketName, config); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
rulesMap := config.ToRulesMap()
globalNotificationSys.AddRulesMap(bucketName, rulesMap)
globalNotificationSys.PutBucketNotification(ctx, bucketName, rulesMap)
writeSuccessResponseHeadersOnly(w)
}
func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "ListenBucketNotification")
defer logger.AuditLog(w, r, "ListenBucketNotification", mustGetClaimsFromToken(r))
// Validate if bucket exists.
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL, guessIsBrowserReq(r))
return
}
if !objAPI.IsNotificationSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
return
}
if !objAPI.IsListenBucketSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
return
}
vars := mux.Vars(r)
bucketName := vars["bucket"]
values := r.URL.Query()
values.Set(peerRESTListenBucket, bucketName)
var prefix string
if len(values[peerRESTListenPrefix]) > 1 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrFilterNamePrefix), r.URL, guessIsBrowserReq(r))
return
}
if len(values[peerRESTListenPrefix]) == 1 {
if err := event.ValidateFilterRuleValue(values[peerRESTListenPrefix][0]); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
prefix = values[peerRESTListenPrefix][0]
}
var suffix string
if len(values[peerRESTListenSuffix]) > 1 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrFilterNameSuffix), r.URL, guessIsBrowserReq(r))
return
}
if len(values[peerRESTListenSuffix]) == 1 {
if err := event.ValidateFilterRuleValue(values[peerRESTListenSuffix][0]); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
suffix = values[peerRESTListenSuffix][0]
}
pattern := event.NewPattern(prefix, suffix)
var eventNames []event.Name
for _, s := range values[peerRESTListenEvents] {
eventName, err := event.ParseName(s)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
eventNames = append(eventNames, eventName)
}
if _, err := objAPI.GetBucketInfo(ctx, bucketName); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
rulesMap := event.NewRulesMap(eventNames, pattern, event.TargetID{ID: mustGetUUID()})
w.Header().Set(xhttp.ContentType, "text/event-stream")
// Listen Publisher and peer-listen-client uses nonblocking send and hence does not wait for slow receivers.
// Use buffered channel to take care of burst sends or slow w.Write()
listenCh := make(chan interface{}, 4000)
peers := newPeerRestClients(globalEndpoints)
globalHTTPListen.Subscribe(listenCh, ctx.Done(), func(evI interface{}) bool {
ev, ok := evI.(event.Event)
if !ok {
return false
}
if ev.S3.Bucket.Name != values.Get(peerRESTListenBucket) {
return false
}
return rulesMap.MatchSimple(ev.EventName, ev.S3.Object.Key)
})
for _, peer := range peers {
if peer == nil {
continue
}
peer.Listen(listenCh, ctx.Done(), values)
}
keepAliveTicker := time.NewTicker(500 * time.Millisecond)
defer keepAliveTicker.Stop()
enc := json.NewEncoder(w)
for {
select {
case evI := <-listenCh:
ev := evI.(event.Event)
if len(string(ev.EventName)) > 0 {
if err := enc.Encode(struct{ Records []event.Event }{[]event.Event{ev}}); err != nil {
return
}
} else {
if _, err := w.Write([]byte(" ")); err != nil {
return
}
}
w.(http.Flusher).Flush()
case <-keepAliveTicker.C:
if _, err := w.Write([]byte(" ")); err != nil {
return
}
w.(http.Flusher).Flush()
case <-ctx.Done():
return
}
}
}