minio/cmd/bucket-notification-handlers.go
Aditya Manthramurthy afbb63a197
Factor out external event notification funcs (#15574)
This change moves external event notification functionality into
`event-notification.go`. This simplifies notification related code.
2022-08-24 06:42:36 -07:00

173 lines
5.3 KiB
Go

// Copyright (c) 2015-2021 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 cmd
import (
"encoding/xml"
"io"
"net/http"
"reflect"
"github.com/gorilla/mux"
"github.com/minio/minio/internal/event"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/bucket/policy"
)
const (
bucketNotificationConfig = "notification.xml"
)
// 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(ctx, w, r, mustGetClaimsFromToken(r))
vars := mux.Vars(r)
bucketName := vars["bucket"]
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
return
}
if !objAPI.IsNotificationSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
return
}
if s3Error := checkRequestAuthType(ctx, r, policy.GetBucketNotificationAction, bucketName, ""); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
return
}
_, err := objAPI.GetBucketInfo(ctx, bucketName, BucketOptions{})
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
config, err := globalBucketMetadataSys.GetNotificationConfig(bucketName)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
config.SetRegion(globalSite.Region)
if err = config.Validate(globalSite.Region, globalEventNotifier.targetList); err != nil {
arnErr, ok := err.(*event.ErrARNNotFound)
if ok {
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.
}
} else {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
}
configData, err := xml.Marshal(config)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
writeSuccessResponseXML(w, configData)
}
// 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(ctx, w, r, mustGetClaimsFromToken(r))
objectAPI := api.ObjectAPI()
if objectAPI == nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
return
}
if !objectAPI.IsNotificationSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
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)
return
}
_, err := objectAPI.GetBucketInfo(ctx, bucketName, BucketOptions{})
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
// PutBucketNotification always needs a Content-Length.
if r.ContentLength <= 0 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingContentLength), r.URL)
return
}
config, err := event.ParseConfig(io.LimitReader(r.Body, r.ContentLength), globalSite.Region, globalEventNotifier.targetList)
if err != nil {
apiErr := errorCodes.ToAPIErr(ErrMalformedXML)
if event.IsEventError(err) {
apiErr = toAPIError(ctx, err)
}
writeErrorResponse(ctx, w, apiErr, r.URL)
return
}
configData, err := xml.Marshal(config)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
if _, err = globalBucketMetadataSys.Update(ctx, bucketName, bucketNotificationConfig, configData); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
rulesMap := config.ToRulesMap()
globalEventNotifier.AddRulesMap(bucketName, rulesMap)
writeSuccessResponseHeadersOnly(w)
}